As filed with the Securities and Exchange Commission on June 26, 2001


1933 Act File No. 333-61062
1940 Act File No. 811-10377

U.S. SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form N-2

[X] REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
[X] Pre-Effective Amendment No. 3
[_] Post-Effective Amendment No. _____________
and
[X] REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
[X] Amendment No. 3

PIMCO Municipal Income Fund
(Exact Name of Registrant as Specified in Declaration of Trust)

c/o PIMCO Advisory Services
1345 Avenue of the Americas
New York, New York 10105
(Address of Principal Executive Offices)

(Number, Street, City, State, Zip Code)

(212) 739-3502
(Registrant's Telephone Number, including Area Code)

Stephen J. Treadway
c/o PIMCO Funds Distributors LLC
2187 Atlantic Street
Stamford, Connecticut 06902
(Name and Address (Number, Street, City, State, Zip Code) of Agent for Service)

Copies of Communications to:

Joseph B. Kittredge, Jr., Esq.                  Thomas A. Hale, Esq.
       Ropes & Gray              Skadden, Arps, Slate, Meagher & Flom (Illinois)
  One International Place                     333 West Wacker Drive
Boston, Massachusetts 02110                  Chicago, Illinois 60606

Approximate Date of Proposed Public Offering:

As soon as practicable after the effective date of this Registration Statement

If any of the securities being registered on this form will be offered on a delayed or continuous basis in reliance on Rule 415 under the Securities Act of 1933, other than securities offered in connection with a dividend reinvestment plan, check the following box. [_]

It is proposed that this filing will become effective (check appropriate box)

[X] when declared effective pursuant to section 8(c)


                           CALCULATION OF REGISTRATION FEE UNDER THE SECURITIES ACT OF 1933
-------------------------------------------------------------------------------------------------------------------------
                                                              Proposed Maximum     Proposed Maximum
                                         Amount Being        Offering Price Per       Aggregate           Amount of
Title of Securities Being Registered      Registered                Unit           Offering Price/1/   Registration Fee/2/
------------------------------------     ------------        ------------------    ----------------    ----------------
Common Shares, no par value              23,333,333 Shares         $15.00            $350,000,000            $87,500
-------------------------------------------------------------------------------------------------------------------------

/1/ Estimated solely for the purpose of calculating the registration fee.

/2/ $3.75 of which has previously been paid.

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the Registration Statement shall become effective on such dates as the Commission, acting pursuant to said Section 8(a), may determine.


PIMCO MUNICIPAL INCOME FUND

Cross Reference Sheet Pursuant to Rule 495(a) Under the Securities Act of 1933

PARTS A AND B OF THE REGISTRATION STATEMENT

Part A
Item No.          Item Caption                                                  Prospectus Caption
--------          ------------                                                  ------------------

1.            Outside Front Cover...........................              Outside Front Cover
2.            Cover Pages; Other Offering Information.......              Inside Front and Outside Back Cover Page
3.            Fee Table and Synopsis........................              Summary of Fund Expenses
4.            Financial Highlights..........................              Not Applicable
5.            Plan of Distribution..........................              Cover Page; Outside Front Cover; Prospectus Summary
6.            Selling Shareholders..........................              Not Applicable
7.            Use of Proceeds...............................              Outside Front Cover; Inside Front Cover; Prospectus
                                                                          Summary; Use of Proceeds; The Fund's Investments
8.            General Description of Registrant.............              Outside Front Cover; Inside Front Cover;
                                                                          Prospectus Summary; The Fund; The Fund's
                                                                          Investments; Preferred Shares and Related
                                                                          Leverage; Risks; How the Fund Manages Risk;
                                                                          Management of the Fund; Distributions; Dividend
                                                                          Reinvestment Plan; Description of Shares; Certain
                                                                          Provisions of the Declaration of Trust; Repurchase
                                                                          of Fund Shares; Conversion to Open-End Fund; Tax
                                                                          Matters
9.            Management....................................              Inside Front Cover; Prospectus Summary; Investment
                                                                          Manager; Portfolio Manager; How the Fund Manages
                                                                          Risk; Management of the Fund; Investment Management
                                                                          Agreement; Certain Provisions in the Declaration of
                                                                          Trust; Custodian and Transfer Agent
10.           Capital Stock, Long-Term Debt,
              and Other Securities..........................              Prospectus Summary; The Fund's Investments;
                                                                          Preferred Shares and Related Leverage;
                                                                          Distributions; Description of Shares; Repurchase of
                                                                          Fund Shares; Tax Matters
11.           Defaults and Arrears on Senior Securities.....              Not Applicable
12.           Legal Proceedings.............................              Not Applicable
13.           Table of Contents of Statement of
              Additional Information........................              Table of Contents for the Statement of Additional
                                                                          Information


Part B                                                                 Statement of Additional
Item No.       Item  Caption                                           Information Caption
--------       -------------                                           -------------------
14.           Cover Page....................................              Cover Page
15.           Table of Contents.............................              Table of Contents
16.           General Information and History...............              Not Applicable
17.           Investment Objective and Policies.............              Investment Objective; Investment Policies and
                                                                          Techniques; Other Investment Policies and
                                                                          Techniques
18.           Management....................................              Management of the Fund; Investment Manager and
                                                                          Portfolio Manager
19.           Control Persons and Principal
              Holders of Securities.........................              Management of the Fund
20.           Investment Advisory and Other Services........              Management of the Fund; Investment Manager
                                                                          and Portfolio Manager; Custodian; Independent
                                                                          Accountants; Counsel
21.           Brokerage Allocation and Other Practices......              Portfolio Transactions
22.           Tax Status....................................              Distributions; Tax Matters
23.           Financial Statements..........................              Report of Independent Accountants; Financial
                                                                          Statements


PART C

The information required to be included in Part C is set forth under the appropriate item, so numbered, in Part C to this Registration Statement.

-2-

PRELIMINARY PROSPECTUS                                       June 26, 2001

                             Subject to Completion

-------------------------------------------------------------------------------

    Shares

PIMCO logo
PIMCO Municipal Income Fund
Common Shares
-------------------------------------------------------------------------------

Investment Objective. The Fund is a newly organized, diversified, closed-end management investment company. The Fund's investment objective is to provide current income exempt from federal income tax. In pursuing this objective, the portfolio manager also seeks to preserve and enhance the value of the Fund's holdings relative to the municipal bond market generally, using proprietary analytical models that test and evaluate the sensitivity of those holdings to changes in interest rates and yield relationships.

Portfolio Contents. Under normal market conditions, the Fund will invest its net assets in a portfolio of municipal bonds the interest from which is exempt from federal income taxes. Under normal market conditions, the Fund expects to be fully invested (at least 90% of its total assets) in tax-exempt municipal bonds. The Fund will seek to avoid bonds generating interest potentially subjecting individuals to the alternative minimum tax. The Fund will invest at least 80% of its net assets in investment grade quality municipal bonds, including bonds that are unrated but judged to be of investment grade quality by the Fund's portfolio manager. The Fund may invest up to 20% of its net assets in municipal bonds that are rated Ba/BB or B or that are unrated but judged to be of comparable quality by the Fund's portfolio manager. The Fund cannot assure you that it will achieve its investment objective.

No Prior History. Because the Fund is newly organized, its common shares have no history of public trading. Shares of closed-end investment companies frequently trade at a discount from their net asset value. The Fund's common shares have been approved for listing on the New York Stock Exchange, subject to notice of issuance. The trading or "ticker" symbol of the common shares is expected to be "PMF."

Before buying any common shares you should read the discussion of the material risks of investing in the Fund in "Risks" beginning on page 14. These risks are summarized in "Special Risk Considerations" beginning on page 3.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

           Price to  Sales Proceeds
             Public   Load  to Fund
-----------------------------------
Per Share   $15.000 $0.675  $14.325
-----------------------------------
Total       $       $       $
-----------------------------------

The Fund will pay organizational and offering expenses estimated at $ from the proceeds of the offering. PIMCO Advisors L.P. has agreed to pay the amount by which the aggregate of all of the Fund's organizational expenses and all offering costs (other than the sales load) exceeds $0.03 per share.

The underwriters expect to deliver the common shares to purchasers on or about , 2001.

UBS Warburg

CIBC World Markets Corp.

A.G. Edwards & Sons, Inc.



(continued from previous page)

You should read this Prospectus, which contains important information about the Fund, before deciding whether to invest and retain it for future reference. A Statement of Additional Information, dated June 26, 2001, containing additional information about the Fund, has been filed with the Securities and Exchange Commission and is incorporated by reference in its entirety into this Prospectus, which means that it is part of the Prospectus for legal purposes. You can review the table of contents of the Statement of Additional Information on page 31 of this Prospectus. You may request a free copy of the Statement of Additional Information by calling (877) 819-2224 or by writing to the Fund, or obtain a copy (and other information regarding the Fund) from the Securities and Exchange Commission web site (http://www.sec.gov).

The Fund's common shares do not represent a deposit or obligation of, and are not guaranteed or endorsed by, any bank or other insured depository institution, and are not federally insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

The underwriters named in this Prospectus may purchase up to additional common shares from the Fund under certain circumstances.

You should rely only on the information contained or incorporated by reference in this Prospectus. The Fund has not, and the underwriters have not, authorized anyone to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. The Fund is not, and the underwriters are not, making an offer of these securities in any state where the offer is not permitted. You should not assume that the information contained in this Prospectus is accurate as of any date other than the date on the front of this Prospectus. The Fund's business, financial condition, results of operations and prospects may have changed since that date.

Until July 21, 2001 (25 days after the date of this Prospectus), all dealers that buy, sell or trade the common shares, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to the dealers' obligation to deliver a prospectus when acting as underwriters and with respect to their unsold allotments or subscriptions.

TABLE OF CONTENTS

Prospectus Summary............   1
Summary of Fund expenses......   6
The Fund......................   8
Use of proceeds...............   8
The Fund's investments........   8
Preferred shares and related
 leverage.....................  12
Risks.........................  14
How the Fund manages risk.....  17
Management of the Fund........  18
Net asset value...............  20
Distributions.................  21
Dividend reinvestment plan....  21

Description of shares.................   23
Certain provisions in the Declaration
 of Trust.............................   25
Repurchase of Fund shares; conversion
 to open-end fund.....................   26
Tax matters...........................   27
Underwriting..........................   28
Custodian and transfer agent..........   30
Legal matters.........................   30
Table of contents for the statement of
 additional information...............   31



Prospectus Summary

This is only a summary. You should review the more detailed information contained in this Prospectus.

THE FUND

PIMCO Municipal Income Fund (the "Fund") is a newly organized, diversified, closed-end management investment company. See "The Fund."

THE OFFERING

The Fund is offering common shares of beneficial interest at $15.00 per share through a group of underwriters (the "Underwriters") led by UBS Warburg LLC ("UBS Warburg"). The common shares of beneficial interest are called "Common Shares" in the rest of this Prospectus. You must purchase at least 100 Common Shares. The Fund has given the Underwriters an option to purchase up to additional Common Shares to cover orders in excess of Common Shares. See "Underwriting." PIMCO Advisors has agreed to pay the amount by which the aggregate of all of the Fund's organizational expenses and all offering costs (other than the sales load) exceeds $0.03 per Common Share.

INVESTMENT OBJECTIVE

The Fund's investment objective is to provide current income exempt from federal income tax. In pursuing this objective, the portfolio manager also seeks to preserve and enhance the value of the Fund's holdings relative to the municipal bond market generally, using proprietary analytical models that test and evaluate the sensitivity of those holdings to changes in interest rates and yield relationships. Under normal market conditions, the Fund expects to be fully invested (at least 90% of its total assets) in a portfolio of municipal bonds the interest from which is exempt from federal income taxes. The Fund will seek to avoid bonds generating interest potentially subjecting individuals to the alternative minimum tax. The Fund will invest at least 80% of its net assets in municipal bonds that at the time of investment are investment grade quality. Investment grade quality bonds are bonds rated within the four highest grades (Baa or BBB or better by Moody's Investors Service, Inc. ("Moody's"), Standard & Poor's ("S&P") or Fitch IBCA, Inc. ("Fitch")), or bonds that are unrated but judged to be of comparable quality by the Fund's portfolio manager. The Fund may invest up to 20% of its net assets in municipal bonds that, at the time of investment, are rated Ba/BB or B by Moody's, S&P or Fitch or that are unrated but judged to be of comparable quality by the Fund's portfolio manager. Bonds of below investment grade quality are regarded as having predominantly speculative characteristics with respect to capacity to pay interest and repay principal, and are commonly referred to as "junk bonds". Bonds in the lowest investment grade category may also be considered to possess some speculative characteristics.

The Fund may invest in "structured" notes, which are privately negotiated debt obligations where the principal and/or interest is determined by reference to the performance of a benchmark asset or market, such as selected securities or an index of securities, or the differential performance of two assets or markets, such as indices reflecting taxable and tax-exempt bonds. The Fund currently intends that any use of structured notes will be for the purpose of reducing the interest rate sensitivity of the Fund's portfolio (and thereby decreasing the Fund's exposure to interest rate risk) and, in any event, that the interest income on the notes will normally be exempt from federal income tax.

The Fund cannot assure you that it will attain its investment objective. See "The Fund's investments."

1

PROPOSED OFFERING OF PREFERRED SHARES

Subject to market conditions, approximately one to three months after completion of this offering, the Fund intends to offer preferred shares of beneficial interest ("Preferred Shares") representing approximately 35% of the Fund's capital after their issuance. The issuance of Preferred Shares will leverage your investment in Common Shares. Leverage involves special risks. There is no assurance that the Fund will issue Preferred Shares or that, if issued, the Fund's leveraging strategy will be successful. See "Risks--Leverage Risk." The net proceeds the Fund obtains from selling the Preferred Shares will be invested principally in long-term municipal bonds, which generally will pay fixed rates of interest over the life of the bond. The Preferred Shares will pay dividends based on shorter-term rates, which will be reset frequently. So long as the rate of return, net of applicable Fund expenses, on the long-term bonds and other investments purchased by the Fund exceeds Preferred Share dividend rates as reset periodically, the investment of the proceeds of the Preferred Shares will generate more income than will be needed to pay dividends on the Preferred Shares. If so, the excess will be used to pay higher dividends to holders of Common Shares ("Common Shareholders"). However, the Fund cannot assure you that the issuance of Preferred Shares will result in a higher yield on your Common Shares. Once Preferred Shares are issued, the net asset value and market price of the Common Shares and the yield to Common Shareholders will be more volatile. See "Preferred shares and related leverage" and "Description of shares--Preferred Shares."

INVESTMENT MANAGER

PIMCO Advisors L.P. ("PIMCO Advisors") serves as the investment manager of the Fund. Subject to the supervision of the Board of Trustees, PIMCO Advisors is responsible for managing, either directly or through others selected by it, the investment activities of the Fund and the Fund's business affairs and other administrative matters. PIMCO Advisors will receive an annual fee, payable monthly, in a maximum amount equal to 0.65% of the Fund's average daily net assets (including assets attributable to any Preferred Shares that may be outstanding). PIMCO Advisors has contractually agreed to waive a portion of the management fees it is entitled to receive from the Fund at the annual rate of 0.20% of the Fund's average daily net assets from the commencement of operations through June 30, 2006 (i.e., roughly the first five years of operations), and for a declining amount for an additional three years of operations (through June 30, 2009). PIMCO Advisors is located at 1345 Avenue of the Americas, New York, New York 10105. Organized in 1987, PIMCO Advisors provides investment management and advisory services to private accounts of institutional and individual clients and to mutual funds. As of March 31, 2001, PIMCO Advisors and its subsidiary partnerships had approximately $275 billion in assets under management.

PIMCO Advisors has retained its affiliate, Pacific Investment Management Company LLC ("PIMCO"), as a sub-adviser to manage the Fund's portfolio investments. See "Portfolio Manager" below.

PORTFOLIO MANAGER

PIMCO will serve as the Fund's sub-adviser responsible for managing the Fund's portfolio investments, and is sometimes referred to herein as the "portfolio manager." Subject to the supervision of PIMCO Advisors, PIMCO has full investment discretion and makes all determinations with respect to the investment of the Fund's assets.

PIMCO is located at 840 Newport Center Drive, Newport Beach, California 92660. Organized in 1971, PIMCO provides investment management and advisory services to private accounts of institutional and individual clients and to mutual funds. As of March 31, 2001, PIMCO had approximately $220 billion in assets under management.

2

PIMCO Advisors (and not the Fund) will pay a portion of the fees it receives to PIMCO in return for PIMCO's services.

DISTRIBUTIONS

Commencing with the Fund's first dividend, the Fund intends to make regular monthly cash distributions to you at a level rate based on the projected performance of the Fund. The Fund's ability to maintain a level dividend rate will depend on a number of factors, including dividends payable on the Preferred Shares. As portfolio and market conditions change, the rate of dividends on the Common Shares and the Fund's dividend policy could change. Over time, the Fund will distribute substantially all of its net investment income (after it pays accrued dividends on any outstanding Preferred Shares). In addition, at least annually, the Fund intends to distribute to you your pro rata share of any available net capital gain and taxable ordinary income. Your initial distribution is expected to be declared approximately 45 days, and paid approximately 60 to 90 days, from the completion of this offering, depending on market conditions. Unless you elect to receive distributions in cash, all of your distributions will be automatically reinvested in additional Common Shares under the Fund's Dividend Reinvestment Plan. See "Distributions" and "Dividend reinvestment plan."

LISTING

The Common Shares have been approved for listing on the New York Stock Exchange, subject to notice of issuance. The trading or "ticker" symbol of the Common Shares is expected to be "PMF." See "Description of shares--Common Shares."

CUSTODIAN AND TRANSFER AGENT

State Street Bank and Trust Co. will serve as custodian of the Fund's assets. PFPC Inc. will serve as the Fund's transfer and dividend disbursement agent. See "Custodian and transfer agent."

MARKET PRICE OF SHARES

Shares of closed-end investment companies frequently trade at prices lower than net asset value. Shares of closed-end investment companies like the Fund that invest predominantly in investment grade municipal bonds have during some periods traded at prices higher than net asset value and during other periods traded at prices lower than net asset value. The Fund cannot assure you that Common Shares will trade at a price higher than net asset value in the future. Net asset value will be reduced immediately following the offering by the sales load and the amount of organization and offering expenses paid by the Fund. See "Use of proceeds." In addition to net asset value, market price may be affected by such factors relating to the Fund or its portfolio holdings as dividend levels (which are in turn affected by expenses), call protection, dividend stability, portfolio credit quality and liquidity and market supply and demand. See "Preferred shares and related leverage," "Risks," "Description of shares," and "Repurchase of Fund shares; conversion to open-end fund" in this Prospectus, and the Statement of Additional Information under "Repurchase of Fund Shares; Conversion to Open-End Fund." The Common Shares are designed primarily for long-term investors, and you should not view the Fund as a vehicle for trading purposes.

SPECIAL RISK CONSIDERATIONS

No Operating History
The Fund is a newly organized, diversified, closed-end management investment company with no history of operations.

3

Interest Rate Risk
Generally, when market interest rates fall, bond prices rise, and vice versa. Interest rate risk is the risk that the municipal bonds in the Fund's portfolio will decline in value because of increases in market interest rates. The prices of longer-term bonds generally fluctuate more than prices of shorter-term bonds as interest rates change. Because the Fund will invest primarily in long-term bonds, the Common Share net asset value and market price per share will fluctuate more in response to changes in market interest rates than if the Fund invested primarily in shorter-term bonds. The Fund may utilize certain strategies, including investments in "structured" notes, for the purpose of reducing the interest rate sensitivity of the portfolio and decreasing the Fund's exposure to interest rate risk, although there is no assurance that it will do so or that such strategies will be successful. The Fund's use of leverage, as described below, will tend to increase Common Share interest rate risk.

Credit Risk
Credit risk is the risk that one or more municipal bonds in the Fund's portfolio will decline in price, or fail to pay interest or principal when due, because the issuer of the bond experiences a decline in its financial status. The Fund may invest up to 20% (measured at the time of investment) of its net assets in municipal bonds that are rated Ba/BB or B or that are unrated but judged to be of comparable quality by PIMCO. The prices of these lower grade bonds are more sensitive to negative developments, such as a decline in the issuer's revenues or a general economic downturn, than are the prices of higher grade securities. Municipal bonds of below investment grade quality (commonly referred to as "junk bonds") are predominantly speculative with respect to the issuer's capacity to pay interest and repay principal when due, and therefore involve a greater risk of default. Municipal bonds in the lowest investment grade category may also be considered to possess some speculative characteristics by certain rating agencies.

Leverage Risk
The use of leverage through the issuance of Preferred Shares creates an opportunity for increased Common Share net income, but also creates special risks for Common Shareholders. There is no assurance that the Fund's leveraging strategy will be successful. It is anticipated that dividends on Preferred Shares will be based on shorter-term municipal bond rates of return (which would be redetermined periodically, pursuant to an auction process), and that the Fund will invest the net proceeds of the Preferred Shares offering principally in long-term, typically fixed rate, municipal bonds. So long as the Fund's municipal bond portfolio provides a higher rate of return (net of Fund expenses) than the Preferred dividend rate, as reset periodically, the leverage will allow Common Shareholders to receive a higher current rate of return than if the Fund were not leveraged. If, however, long- and/or short-term rates rise, the Preferred dividend rate could exceed the rate of return on long-term bonds and other investments held by the Fund that were acquired during periods of generally lower interest rates, reducing return to Common Shareholders. Investment by the Fund in residual interest municipal bonds ("RIBS") and other derivative instruments may amplify the effects of leverage and, during periods of rising interest rates, may adversely affect the Fund's income and distributions to Common Shareholders. See "The Fund's investments" for a discussion of these instruments. Preferred Shares are expected to pay cumulative dividends, which may tend to increase leverage risk. Leverage creates two major types of risks for Common Shareholders:

.the likelihood of greater volatility of net asset value and market price of Common Shares, because changes in the value of the Fund's bond portfolio
(including bonds bought with the proceeds of the Preferred Shares offering)
are borne entirely by the Common Shareholders; and

.the possibility either that Common Share income will fall if the Preferred dividend rate rises, or that Common Share income will fluctuate because the Preferred dividend rate varies.

4

Because the fees received by PIMCO Advisors are based on the total net assets of the Fund (including assets represented by Preferred Shares and any leverage created thereby), PIMCO Advisors has a financial incentive for the Fund to issue Preferred Shares, which may create a conflict of interest between PIMCO Advisors and the holders of the Common Shares.

Municipal Bond Market Risk
The amount of public information available about the municipal bonds in the Fund's portfolio is generally less than that for corporate equities or bonds, and the investment performance of the Fund may therefore be more dependent on the analytical abilities of PIMCO than would be a stock fund or taxable bond fund. The secondary market for municipal bonds, particularly below investment grade bonds in which the Fund may invest, also tends to be less well-developed and less liquid than many other securities markets, which may adversely affect the Fund's ability to sell its bonds at attractive prices.

Anti-Takeover Provisions
The Fund's Agreement and Declaration of Trust (the "Declaration") includes provisions that could limit the ability of other entities or persons to acquire control of the Fund or convert the Fund to open-end status. See "Certain provisions in the Declaration of Trust." These provisions in the Declaration could have the effect of depriving the Common Shareholders of opportunities to sell their Common Shares at a premium over the then current market price of the Common Shares.

Tax Considerations
The Fund's distributions of ordinary taxable income (including any net short- term capital gain) will be taxable to shareholders as ordinary income, and capital gain dividends will be subject to capital gains taxes. See "Tax matters."

5

Summary of Fund expenses

The following table assumes the issuance of Preferred Shares in an amount equal to 35% of the Fund's capital (after their issuance), and shows Fund expenses as a percentage of net assets attributable to Common Shares. Footnote 2 to the table shows Fund expenses as a percentage of total net assets (attributable to both Common and Preferred Shares).

Shareholder Transaction Expenses
   Sales Load Paid by You (as a percentage of offering price).......... 4.50%
   Dividend Reinvestment Plan Fees.....................................  None(1)

                                                                   Percentage of
                                                                      Net Assets
                                                                 Attributable to
                                                               Common Shares (2)
--------------------------------------------------------------------------------
Annual Expenses
  Management Fees.............................................          1.00%
  Other Expenses..............................................          0.31%
  Total Annual Expenses.......................................          1.31%
  Fee Waiver (Years 1-5)......................................        (0.31)%(3)
  Net Annual Expenses (Years 1-5).............................          1.00%(3)

(1) You will pay brokerage charges if you direct the plan agent to sell your Common Shares held in a dividend reinvestment account.

(2) The table presented in this footnote estimates what the Fund's annual expenses would be stated as percentages of the Fund's total net assets (rather than stated as percentages of the Fund's net assets attributable to Common Shares, as presented above), and again assuming the issuance of Preferred Shares in an amount equal to 35% of the Fund's capital (after their issuance). In accordance with these assumptions, the Fund's expenses would be estimated to be as follows:

                                                                 Percentage of
                                                              Total Net Assets
------------------------------------------------------------------------------
 Annual Expenses
   Management Fees..........................................          0.65%
   Other Expenses...........................................          0.20%
   Total Annual Expenses....................................          0.85%
   Fees Waiver (Years 1-5)..................................        (0.20)%(3)
   Net Annual Expenses (Years 1-5)..........................          0.65%(3)

(3) PIMCO Advisors has contractually agreed to waive a portion of the management fees it is entitled to receive from the Fund at the annual rate of 0.20% of the Fund's average daily net assets from the commencement of operations through June 30, 2006 (i.e., roughly the first 5 years of Fund operations), 0.15% of average daily net assets in year 6, 0.10% in year 7, and 0.05% in year 8. PIMCO Advisors has not agreed to waive any portion of its fees and expenses beyond June 30, 2009. Without the fee waiver, "Net Annual Expenses" would be estimated to be 1.31% of average daily net assets attributable to Common Shares and 0.85% of average total daily net assets (attributable to both Common and Preferred Shares). PIMCO Advisors has agreed to pay the amount by which the aggregate of all of the Fund's organizational expenses and all offering costs (other than the sales load) exceeds $0.03 per Common Share.

6

The purpose of the table above is to help you understand all fees and expenses that you, as a Common Shareholder, would bear directly or indirectly. The Other Expenses shown in the table and related footnotes are based on estimated amounts for the Fund's first year of operations and assume that the Fund issues approximately 6.7 million Common Shares. See "Management of the Fund" and "Dividend reinvestment plan."

As required by relevant Securities and Exchange Commission regulations, the following example illustrates the expenses (including the sales load of $45) that you would pay on a $1,000 investment in Common Shares, assuming (1) total net annual expenses of 1.00% of net assets attributable to Common Shares in years 1 through 5, increasing to 1.31% in years 9 and 10, and (2) a 5% annual return(1):

      1 Year              3 Years                       5 Years                       10 Years (2)
--------------------------------------------------------------------------------------------------
         $55                  $75                           $98                               $176

The example above should not be considered a representation of future expenses. Actual expenses may be higher or lower than those shown.

(1) The example assumes that the estimated Other Expenses set forth in the Annual Expenses table are accurate, that fees and expenses increase as described in note 2 below, and that all dividends and distributions are reinvested at net asset value. Actual expenses may be greater or less than those assumed. Moreover, the Fund's actual rate of return may be greater or less than the hypothetical 5% annual return shown in the example.

(2) Assumes waiver of management fees at the annual rate of 0.15% of the Fund's average daily net assets in year 6, 0.10% in year 7, 0.05% in year 8, and no waiver in years 9 and 10. PIMCO Advisors has not agreed to waive any portion of the management fees it is entitled to receive from the Fund beyond June 30, 2009. See "Management of the Fund--Investment Management Agreement."

7


The Fund

The Fund is a recently organized, diversified, closed-end management investment company registered under the Investment Company Act of 1940 and the rules and regulations thereunder, as amended (the "1940 Act"). The Fund was organized as a Massachusetts business trust on May 9, 2001 pursuant to the Declaration, which is governed by the laws of The Commonwealth of Massachusetts. As a newly organized entity, the Fund has no operating history. The Fund's principal office is located at 1345 Avenue of the Americas, New York, New York 10105, and its telephone number is (212) 739-3369.

Use of proceeds

The net proceeds of the offering of Common Shares will be approximately $
(or $ if the Underwriters exercise the over-allotment option in full)
after payment of the estimated organization and offering costs. PIMCO Advisors has agreed to pay the amount by which the aggregate of all of the Fund's organizational expenses and all offering costs (other than the sales load) exceeds $0.03 per Common Share. The Fund will invest the net proceeds of the offering in accordance with the Fund's investment objective and policies as stated below. It is presently anticipated that the Fund will be able to invest substantially all of the net proceeds in municipal bonds that meet the investment objective and policies within three months after the completion of the offering. Pending such investment, it is anticipated that the proceeds will be invested in short-term, tax-exempt securities.

The Fund's investments

INVESTMENT OBJECTIVE AND POLICIES

The Fund's investment objective is to provide current income exempt from federal income tax. In pursuing this objective, PIMCO also seeks to preserve and enhance the value of the Fund's holdings relative to the municipal bond market generally, using proprietary analytical models that test and evaluate the sensitivity of those holdings to changes in interest rates and yield relationships.

PIMCO may at times believe that bonds associated with a particular municipal market sector (for example, electric utilities), issued by a particular municipal issuer, or having particular structural characteristics, are undervalued. PIMCO may purchase such a bond for the Fund's portfolio because it represents a market sector or issuer that PIMCO considers undervalued, even if the value of the particular bond appears to be consistent with the value of similar bonds. Municipal bonds of particular types (e.g., hospital bonds, industrial revenue bonds or bonds issued by a particular municipal issuer) may be undervalued because there is a temporary excess of supply in that market sector, or because of a general decline in the market price of municipal bonds of the market sector for reasons that do not apply to the particular municipal bonds that are considered undervalued. The Fund's investment in municipal bonds may be based on PIMCO's belief that their yield and/or total return potential is higher than that available on bonds bearing similar levels of interest rate risk, credit risk and other forms of risk, or that their value relative to the municipal bond market is less sensitive to these risks. The Fund attempts to increase its portfolio value relative to the municipal bond market generally by prudent selection of municipal bonds regardless of the direction the market may move. Any capital appreciation realized by the Fund will generally result in the distribution of taxable capital gains to Common Shareholders.

Under normal market conditions, the Fund will invest its net assets in a portfolio of municipal bonds the interest from which is exempt from federal income taxes. The Fund expects to be fully invested (at least 90% of its total assets) in tax-exempt municipal bonds under normal market conditions.


8

The Fund's investments


The Fund will seek to avoid bonds generating interest potentially subjecting individuals to the alternative minimum tax. The Fund will invest at least 80% of its net assets in investment grade quality municipal bonds. Investment grade quality means that such bonds are rated, at the time of investment, within the four highest grades (Baa or BBB or better by Moody's, S&P or Fitch) or are unrated but judged to be of comparable quality by PIMCO. The Fund may invest up to 20% of its net assets in municipal bonds that are rated, at the time of investment, Ba/BB or B by Moody's, S&P or Fitch or that are unrated but judged to be of comparable quality by PIMCO. Bonds of below investment grade quality (Ba/BB or below) are commonly referred to as "junk bonds." Bonds of below investment grade quality are regarded as having predominantly speculative characteristics with respect to capacity to pay interest and repay principal. Bonds in the lowest investment grade category may also be considered to possess some speculative characteristics by certain rating agencies. The foregoing credit quality policies apply only at the time a security is purchased, and the Fund is not required to dispose of a security in the event that a rating agency or PIMCO downgrades its assessment of the credit characteristics of a particular issue. In determining whether to retain or sell such a security, PIMCO may consider such factors as PIMCO's assessment of the credit quality of the issuer of such security, the price at which such security could be sold and the rating, if any, assigned to such security by other rating agencies. A general description of Moody's, S&P's and Fitch's ratings of municipal bonds is set forth in Appendix A to the Statement of Additional Information. The Fund may also invest in securities of other open- or closed-end investment companies that invest primarily in municipal bonds of the types in which the Fund may invest directly. As a stockholder in an investment company, the Fund would bear its ratable share of that investment company's expenses in addition to the Fund's own expenses. See "--Other Investment Companies" below.

The Fund may purchase municipal bonds that are additionally secured by insurance, bank credit agreements, or escrow accounts. The credit quality of companies which provide such credit enhancements will affect the value of those securities. Although the insurance feature reduces certain financial risks, the premiums for insurance and the higher market price paid for insured obligations may reduce the Fund's income. Insurance generally will be obtained from insurers with a claims-paying ability rated Aaa by Moody's or AAA by S&P or Fitch. The insurance feature does not guarantee the market value of the insured obligations or the net asset value of the Common Shares.

Upon PIMCO's recommendation, temporarily or for defensive purposes and in order to keep the Fund's cash fully invested, including the period during which the net proceeds of this offering are being invested, the Fund may invest up to 100% of its net assets in short-term investments including high quality, short- term securities that may be either tax-exempt or taxable. The Fund intends to invest in taxable short-term investments only in the event that suitable tax- exempt short-term investments are not available at reasonable prices and yields. Investment in taxable short-term investments would result in a portion of your dividends being subject to federal income taxes. For more information, see the Statement of Additional Information.

The Fund cannot change its investment objective without the approval of the holders of a "majority of the outstanding" Common Shares and Preferred Shares voting together as a single class, and of the holders of a "majority of the outstanding" Preferred Shares voting as a separate class. A "majority of the outstanding" shares (whether voting together as a single class or voting as a separate class) means (i) 67% or more of such shares present at a meeting, if the holders of more than 50% of those shares are present or represented by proxy, or (ii) more than 50% of such shares, whichever is less. See "Description of shares--Preferred Shares--Voting Rights" in this Prospectus and the Statement of Additional Information under "Description of shares--Preferred Shares--Voting Rights" for additional information with respect to the voting rights of holders of Preferred Shares.

The Fund will seek to avoid portfolio investments that pay interest that is taxable to individuals under the federal alternative minimum tax. Nonetheless, the Fund may not be successful in this regard and if


9

The Fund's investments


you are, or as a result of an investment in the Fund would become, subject to the federal alternative minimum tax, the Fund may not be a suitable investment for you. Special alternative minimum tax rules apply to corporate holders. In addition, capital gain dividends will be subject to capital gains taxes. See "Tax matters."

MUNICIPAL BONDS

Municipal bonds are either general obligation or revenue bonds and typically are issued to finance public projects (such as roads or public buildings), to pay general operating expenses, or to refinance outstanding debt. General obligation bonds are backed by the full faith and credit, or taxing authority, of the issuer and may be repaid from any revenue source; revenue bonds may be repaid only from the revenues of a specific facility or source. The Fund also may purchase municipal bonds that represent lease obligations. These carry special risks because the issuer of the bonds may not be obligated to appropriate money annually to make payments under the lease. In order to reduce this risk, the Fund will only purchase municipal bonds representing lease obligations where PIMCO believes the issuer has a strong incentive to continue making appropriations until maturity.

The municipal bonds in which the Fund will invest are generally issued by States, cities or local authorities, or certain possessions and territories of the United States (such as Puerto Rico or Guam), and pay interest that, in the opinion of bond counsel to the issuer (or on the basis of other authority believed by PIMCO to be reliable), is exempt from federal income taxes.

The yields on municipal bonds depend on a variety of factors, including prevailing interest rates and the condition of the general money market and the municipal bond market, the size of a particular offering, the maturity of the obligation and the rating of the issue. The market value of municipal bonds will vary with changes in interest rate levels and as a result of changing evaluations of the ability of their issuers to meet interest and principal payments.

The Fund will invest primarily in municipal bonds with long-term maturities in order to maintain a weighted average maturity of 15-30 years, but the weighted average maturity of obligations held by the Fund may be shortened, depending on market conditions.

WHEN-ISSUED, DELAYED DELIVERY AND FORWARD COMMITMENT TRANSACTIONS

The Fund may buy and sell municipal bonds on a when-issued, delayed delivery or forward commitment basis, making payment or taking delivery at a later date, normally within 45 days of the trade date. This type of transaction may involve an element of risk because no interest accrues on the bonds prior to settlement and, since bonds are subject to market fluctuations, the value of the bonds at time of delivery may be less (or more) than cost. When such purchases are outstanding, the Fund will segregate until the settlement date assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, in an amount sufficient to meet the purchase price.

STRUCTURED NOTES

The Fund may invest in "structured" notes, which are privately negotiated debt obligations where the principal and/or interest is determined by reference to the performance of a benchmark asset or market, such as selected securities or an index of securities, or the differential performance of two assets or markets, such as indices reflecting taxable and tax-exempt bonds. Depending on the terms of the note, the Fund may forgo all or part of the interest and principal that would be payable on a comparable conventional note. The rate of return on structured notes may be determined by applying a multiplier to the performance or differential performance of the referenced index(es) or other asset(s). Application of a multiplier involves leverage which will serve to magnify the potential for gain and the risk of loss.


10

The Fund's investments


The Fund currently intends that any use of structured notes will be for the purpose of reducing the interest rate sensitivity of the Fund's portfolio (and thereby decreasing the Fund's exposure to interest rate risk) and, in any event, that the interest income on the notes will normally be exempt from federal income tax. The Fund will only invest in structured notes if it has received an opinion of counsel for the issuer (or the advice of another authority believed by PIMCO to be reliable) that the interest income on the notes will be exempt from federal income tax. Like other sophisticated strategies, the Fund's use of structured notes may not work as intended; for example, by reducing the duration of the Fund's portfolio, structured notes may limit the Fund's return when having a longer duration would be beneficial (for instance, when interest rates decline).

VARIABLE AND FLOATING RATE SECURITIES

Variable and floating rate securities provide for a periodic adjustment in the interest rate paid on the obligations. The Fund may invest in floating rate debt instruments ("floaters") and engage in credit spread trades. While floaters provide a certain degree of protection against rises in interest rates, the Fund will participate in any decline in interest rates as well. A credit spread trade is an investment position relating to a difference in the prices or interest rates of two bonds or other securities, where the value of the investment position is determined by changes in the difference between such prices or interest rates, as the case may be, of the respective securities.

RESIDUAL INTEREST MUNICIPAL BONDS (RIBS)

The Fund may also invest up to 10% of its assets in RIBS, whose interest rates bear an inverse relationship to the interest rate on another security or the value of an index. An investment in RIBS typically will involve greater risk than an investment in a fixed rate bond. Because changes in the interest rate on the other security or index inversely affect the residual interest paid on a RIB, the value of a RIB is generally more volatile than that of a fixed rate bond. RIBS have interest rate adjustment formulas which generally reduce or, in the extreme, eliminate the interest paid to the Fund when short-term interest rates rise, and increase the interest paid to the Fund when short-term interest rates fall. RIBS have varying degrees of liquidity, and the market for these securities is volatile. These securities generally will underperform the market for fixed rate bonds in a rising interest rate environment, but tend to outperform the market for fixed rate bonds when interest rates decline or remain relatively stable. Although volatile, RIBS typically offer the potential for yields exceeding the yields available on fixed rate bonds with comparable credit quality, coupon, call provisions and maturity. The Fund may also invest in RIBS for the purpose of increasing the Fund's leverage as a more flexible alternative to the issuance of Preferred Shares. Should short-term interest rates rise, the combination of the Fund's investment in RIBS and its use of other forms of leverage (including through the issuance of Preferred Shares or the use of other derivative instruments) likely will adversely affect the Fund's net asset value per share and income and distributions to shareholders. Trusts in which RIBS may be held could be terminated, in which case the residual bond holder would take possession of the underlying bond on an unleveraged basis.

OTHER INVESTMENT COMPANIES

The Fund may invest up to 10% of its net assets in securities of other open- or closed-end investment companies that invest primarily in municipal bonds of the types in which the Fund may invest directly. The Fund may invest in other investment companies either during periods when it has large amounts of uninvested cash, such as the period shortly after the Fund receives the proceeds of the offering of its Common Shares or Preferred Shares, during periods when there is a shortage of attractive, high-yielding municipal bonds available in the market, or when PIMCO believes share prices of other investment


11

The Fund's investments


companies offer attractive values. The Fund may invest in investment companies that are advised by PIMCO or its affiliates to the extent permitted by applicable law and/or pursuant to exemptive relief from the Securities and Exchange Commission. As a stockholder in an investment company, the Fund will bear its ratable share of that investment company's expenses, and would remain subject to payment of the Fund's management fees and other expenses with respect to assets so invested. Common Shareholders would therefore be subject to duplicative expenses to the extent the Fund invests in other investment companies. PIMCO will take expenses into account when evaluating the investment merits of an investment in an investment company relative to available municipal bond investments. In addition, the securities of other investment companies may also be leveraged and will therefore be subject to the same leverage risks described herein. As described in the section entitled "Risks," the net asset value and market value of leveraged shares will be more volatile and the yield to shareholders will tend to fluctuate more than the yield generated by unleveraged shares.

Preferred shares and related leverage

Subject to market conditions, approximately one to three months after the completion of the offering of the Common Shares, the Fund intends to offer Preferred Shares representing approximately 35% of the Fund's capital immediately after the issuance of the Preferred Shares. The Preferred Shares have complete priority upon distribution of assets over the Common Shares. The issuance of Preferred Shares will leverage the Common Shares. Leverage involves special risks. There is no assurance that the Fund's leveraging strategy will be successful. Although the timing and other terms of the offering of the Preferred Shares will be determined by the Fund's Board of Trustees, the Fund expects to invest the net proceeds of the Preferred Shares offering principally in long-term municipal bonds. The Preferred Shares will pay dividends based on shorter-term rates (which would be redetermined periodically by an auction process). So long as the Fund's portfolio is invested in securities that provide a higher rate of return than the dividend rate of the Preferred Shares (after taking expenses into consideration), the leverage will allow you to receive a higher current rate of return than if the Fund were not leveraged.

Changes in the value of the Fund's bond portfolio (including bonds bought with the proceeds of the Preferred Shares offering) will be borne entirely by the Common Shareholders. If there is a net decrease (or increase) in the value of the Fund's investment portfolio, the leverage will decrease (or increase) the net asset value per Common Share to a greater extent than if the Fund were not leveraged. During periods in which the Fund is using leverage, the fees paid to PIMCO Advisors will be higher than if the Fund did not use leverage because the fees paid will be calculated on the basis of the Fund's total net assets, including the proceeds from the issuance of Preferred Shares.

For tax purposes, the Fund is currently required to allocate net capital gain and other taxable income, if any, between the Common Shares and Preferred Shares in proportion to total distributions paid to each class for the year in which the net capital gain or other taxable income is realized. If net capital gain or other taxable income is allocated to Preferred Shares (instead of solely tax-exempt income), the Fund will have to pay higher total dividends to Preferred Shareholders or make dividend payments intended to compensate Preferred Shareholders for the unanticipated characterization of a portion of their dividends as taxable ("Gross-up Dividends"). This would reduce any advantage of the Fund's leveraged structure to Common Shareholders.

Under the 1940 Act, the Fund is not permitted to issue Preferred Shares unless immediately after such issuance the value of the Fund's total net assets is at least 200% of the liquidation value of the outstanding Preferred Shares (i.e., such liquidation value may not exceed 50% of the Fund's total net assets). In addition, the Fund is not permitted to declare any cash dividend or other distribution on its


12

Preferred shares and related leverage


Common Shares unless, at the time of such declaration, the value of the Fund's total net assets is at least 200% of such liquidation value. If Preferred Shares are issued, the Fund intends, to the extent possible, to purchase or redeem Preferred Shares from time to time to the extent necessary in order to maintain coverage of any Preferred Shares of at least 200%. If the Fund has Preferred Shares outstanding, two of the Fund's trustees will be elected by the holders of Preferred Shares, voting separately as a class. The remaining trustees of the Fund will be elected by holders of Common Shares and Preferred Shares voting together as a single class. In the event the Fund failed to pay dividends on Preferred Shares for two years, Preferred Shareholders would be entitled to elect a majority of the trustees of the Fund.

The Fund may be subject to certain restrictions imposed by guidelines of one or more rating agencies which may issue ratings for Preferred Shares issued by the Fund. These guidelines may impose asset coverage or portfolio composition requirements that are more stringent than those imposed on the Fund by the 1940 Act. It is not anticipated that these covenants or guidelines will impede PIMCO from managing the Fund's portfolio in accordance with the Fund's investment objective and policies.

The Fund may also borrow money for repurchase of its shares or as a temporary measure for extraordinary or emergency purposes, including the payment of dividends and the settlement of securities transactions which otherwise might require untimely dispositions of Fund securities.

Assuming that the Preferred Shares will represent approximately 35% of the Fund's capital and pay dividends at an annual average rate of 3.00%, the income generated by the Fund's portfolio (net of expenses) would have to exceed 1.05% in order to cover such dividend payments. Of course, these numbers are merely estimates, used for illustration. Actual Preferred Share dividend rates will vary frequently and may be significantly higher or lower than the rate identified above.

The following table is furnished in response to requirements of the Securities and Exchange Commission. It is designed to illustrate the effect of leverage on Common Share total return, assuming investment portfolio total returns (consisting of income and changes in the value of bonds held in the Fund's portfolio) of -10%, -5%, 0%, 5% and 10%. These assumed investment portfolio returns are hypothetical figures and are not necessarily indicative of the investment portfolio returns expected to be experienced by the Fund. The table further assumes the issuance of Preferred Shares representing 35% of the Fund's total capital, a 5.25% yield on the Fund's investment portfolio, net of expenses, and the Fund's currently projected annual Preferred Share dividend rate of 3.00%. See "Risks" and "Preferred shares and related leverage."

Assumed Portfolio Total Return............ (10.00)% (5.00)%  0.00 % 5.00% 10.00%
Common Share Total Return................. (17.00)% (9.31)% (1.62)% 6.08% 13.77%

Common Share total return is composed of two elements--the Common Share dividends paid by the Fund (the amount of which is largely determined by the net investment income of the Fund after paying dividends on Preferred Shares) and gains or losses on the value of the securities the Fund owns. As required by Securities and Exchange Commission rules, the table assumes that the Fund is more likely to suffer capital losses than to enjoy capital appreciation. For example, to assume a total return of 0%, the Fund must assume that the tax- exempt interest it receives on its municipal bond investments is entirely offset by losses in the value of those bonds.

Unless and until Preferred Shares are issued, the Common Shares would only be leveraged, if at all, through the use of RIBS, other derivatives and short-term borrowings.


13


Risks

The net asset value of the Common Shares will fluctuate with and be affected by, among other things, interest rate risk, credit risk, reinvestment risk and leverage risk, and an investment in Common Shares will be subject to market discount risk, inflation risk and municipal bond market risk, each of which is more fully described below.

NEWLY ORGANIZED

The Fund is a newly organized, diversified, closed-end management investment company and has no operating history.

MARKET DISCOUNT RISK

Shares of closed-end management investment companies frequently trade at a discount from their net asset value.

INTEREST RATE RISK

Interest rate risk is the risk that bonds (and the Fund's net assets) will decline in value because of changes in interest rates. Generally, municipal bonds will decrease in value when interest rates rise and increase in value when interest rates decline. This means that the net asset value of the Common Shares will fluctuate with interest rate changes and the corresponding changes in the value of the Fund's municipal bond holdings. The value of the longer- term bonds in which the Fund generally invests normally fluctuates more in response to changes in interest rates than does the value of shorter-term bonds. Because the Fund will invest primarily in long-term bonds, the Common Share net asset value and market price per share will fluctuate more in response to changes in market interest rates than if the Fund invested primarily in shorter-term bonds. The Fund's use of leverage, as described below, will tend to increase Common Share interest rate risk. The Fund may invest up to 10% of its assets in RIBS. Compared to similar fixed rate municipal obligations, the value of RIBS will fluctuate to a greater extent in response to changes in prevailing long-term interest rates. Moreover, the income earned on RIBS will fluctuate in response to changes in prevailing short-term interest rates. Thus, when RIBS are held by the Fund, an increase in short- or long-term market interest rates will adversely affect the income received from such bonds or the net asset value of the Fund's shares. The Fund may utilize certain strategies, including investments in structured notes, for the purpose of reducing the interest rate sensitivity of the portfolio and decreasing the Fund's exposure to interest rate risk, although there is no assurance that it will do so or that such strategies will be successful. See "How the Fund manages risk--Hedging and Related Strategies."

CREDIT RISK

Credit risk is the risk that an issuer of a municipal bond will become unable to meet its obligation to make interest and principal payments. In general, lower rated municipal bonds carry a greater degree of risk that the issuer will lose its ability to make interest and principal payments, which could have a negative impact on the Fund's net asset value or dividends. The Fund may invest up to 20% of its net assets in municipal bonds that are rated Ba/BB or B by Moody's, S&P or Fitch or that are unrated but judged to be of comparable quality by PIMCO. Bonds rated Ba/BB or B are regarded as having predominantly speculative characteristics with respect to capacity to pay interest and repay principal, and these bonds are commonly referred to as "junk bonds." The prices of these lower grade bonds are more sensitive to negative developments, such as a decline in the issuer's revenues or a general economic downturn, than are the prices of higher grade securities. Bonds in the lowest investment grade category may also be considered to possess some speculative characteristics by certain rating agencies.


14

Risks


MUNICIPAL BOND MARKET RISK

Investing in the municipal bond market involves certain risks. The amount of public information available about the municipal bonds in the Fund's portfolio is generally less than that for corporate equities or bonds, and the investment performance of the Fund may therefore be more dependent on the analytical abilities of PIMCO than would be a stock fund or taxable bond fund. The secondary market for municipal bonds, particularly the below investment grade bonds in which the Fund may invest, also tends to be less well-developed or liquid than many other securities markets, which may adversely affect the Fund's ability to sell its bonds at attractive prices.

The ability of municipal issuers to make timely payments of interest and principal may be diminished during general economic downturns and as governmental cost burdens are reallocated among federal, state and local governments. In addition, laws enacted in the future by Congress or state legislatures or referenda could extend the time for payment of principal and/or interest, or impose other constraints on enforcement of such obligations, or on the ability of municipal issuers to levy taxes. Issuers of municipal securities might seek protection under the bankruptcy laws. In the event of bankruptcy of such an issuer, the Fund could experience delays in collecting principal and interest and the Fund may not, in all circumstances, be able to collect all principal and interest to which it is entitled. To enforce its rights in the event of a default in the payment of interest or repayment of principal, or both, the Fund may take possession of and manage the assets securing the issuer's obligations on such securities, which may increase the Fund's operating expenses. Any income derived from the Fund's ownership or operation of such assets may not be tax-exempt.

REINVESTMENT RISK

Reinvestment risk is the risk that income from the Fund's bond portfolio will decline if and when the Fund invests the proceeds from matured, traded or called bonds at market interest rates that are below the portfolio's current earnings rate. A decline in income could affect the Common Shares' market price or their overall returns.

LEVERAGE RISK

Leverage risk includes the risk associated with the issuance of the Preferred Shares to leverage the Common Shares. There can be no assurance that the Fund's leveraging strategy involving Preferred Shares will be successful. Once the Preferred Shares are issued, the net asset value and market value of Common Shares will be more volatile, and the yield to Common Shareholders will tend to fluctuate with changes in the shorter-term dividend rates on the Preferred Shares. The Fund anticipates that the Preferred Shares, at least initially, would likely pay cumulative dividends at rates determined over relatively shorter-term periods (such as 7 days), by providing for the periodic redetermination of the dividend rate through an auction or remarketing procedures. See "Description of shares--Preferred Shares." Long-term municipal bond rates of return are typically, although not always, higher than shorter- term municipal bond rates of return. If the dividend rate on the Preferred Shares approaches the net rate of return on the Fund's investment portfolio, the benefit of leverage to Common Shareholders would be reduced. If the dividend rate on the Preferred Shares exceeds the net rate of return on the Fund's portfolio, the leverage will result in a lower rate of return to Common Shareholders than if the Fund were not leveraged. Because the long-term bonds included in the Fund's portfolio will typically pay fixed rates of interest while the dividend rate on the Preferred Shares will be adjusted periodically, this could occur even when both long-term and short-term municipal rates rise. In addition, the Fund will pay (and Common Shareholders will bear) any costs and expenses relating to the issuance and ongoing maintenance of the Preferred Shares. Furthermore, if the Fund has net capital gain or other taxable income that is allocated to Preferred Shares (instead of solely tax-exempt income), the Fund may have to pay higher total dividends or Gross-up Dividends to Preferred Shareholders, which would reduce any advantage of the Fund's leverage structure to Common Shareholders without reducing the associated risk. See "Preferred shares and related leverage." Accordingly, the Fund cannot assure you that the issuance of Preferred Shares will result in a higher yield or return to Common Shareholders.

Similarly, any decline in the net asset value of the Fund's investments will be borne entirely by Common Shareholders. Therefore, if the market value of the Fund's portfolio declines, the leverage will result in a greater decrease in net asset value to Common Shareholders than if the Fund were not


15

Risks


leveraged. Such greater net asset value decrease will also tend to cause a greater decline in the market price for the Common Shares. The Fund might be in danger of failing to maintain the required 200% asset coverage or of losing its expected AAA/aaa ratings on the Preferred Shares or, in an extreme case, the Fund's current investment income might not be sufficient to meet the dividend requirements on the Preferred Shares. In order to counteract such an event, the Fund might need to liquidate investments in order to fund a redemption of some or all of the Preferred Shares. Liquidation at times of low municipal bond prices may result in capital loss and may reduce returns to Common Shareholders.

While the Fund may from time to time consider reducing leverage in response to actual or anticipated changes in interest rates in an effort to mitigate the increased volatility of current income and net asset value associated with leverage, there can be no assurance that the Fund will actually reduce leverage in the future or that any reduction, if undertaken, will benefit the Common Shareholders. Changes in the future direction of interest rates are very difficult to predict accurately. If the Fund were to reduce leverage based on a prediction about future changes to interest rates, and that prediction turned out to be incorrect, the reduction in leverage would likely operate to reduce the income and/or total returns to Common Shareholders relative to the circumstance where the Fund had not reduced leverage. The Fund may decide that this risk outweighs the likelihood of achieving the desired reduction to volatility in income and share price if the prediction were to turn out to be correct, and determine not to reduce leverage as described above.

The Fund may invest in the securities of other investment companies. Such securities may also be leveraged and will therefore be subject to the leverage risks described above. Such additional leverage may in certain market conditions serve to reduce the net asset value of the Fund's Common Shares and the returns to Common Shareholders.

The Fund may also invest up to 10% of its assets in RIBS and invest in other derivative instruments, which may amplify the effects of leverage and, during periods of rising short-term interest rates, may adversely affect the Fund's net asset value per share and income and distributions to Common Shareholders. See "Residual Interest Municipal Bonds (RIBS)" under "The Fund's investments" and the Statement of Additional Information under "Investment objectives and policies--Derivative Instruments."

INFLATION RISK

Inflation risk is the risk that the value of assets or income from an investment will be worth less in the future as inflation decreases the value of money. As inflation increases, the real value of the Common Shares and distributions can decline. In addition, during any periods of rising inflation, Preferred Share dividend rates would likely increase, which would tend to further reduce returns to Common Shareholders.

CERTAIN AFFILIATIONS

Certain broker-dealers may be considered to be affiliated persons of the Fund, PIMCO Advisors and/or PIMCO due to their possible affiliations with Allianz AG, the ultimate parent of PIMCO Advisors and PIMCO. Absent an exemption from the Securities and Exchange Commission or other regulatory relief, the Fund is generally precluded from effecting certain principal transactions with affiliated brokers, and its ability to purchase securities being underwritten by an affiliated broker or a syndicate including an affiliated broker or to utilize affiliated brokers for agency transactions is subject to restrictions. This could limit the Fund's ability to engage in securities transactions and take advantage of market opportunities.


16


How the Fund manages risk

INVESTMENT LIMITATIONS

The Fund has adopted certain investment limitations designed to limit investment risk and maintain portfolio diversification. These limitations (two of which are listed below) are fundamental and may not be changed without the approval of the holders of a majority of the outstanding Common Shares and, if issued, Preferred Shares voting together as a single class, and the approval of the holders of a majority of the Preferred Shares voting as a separate class. The Fund may not:

.Concentrate its investments in a particular industry, as that term is used in the 1940 Act and as interpreted, modified, or otherwise permitted by regulatory authority having jurisdiction, from time to time; and

.With respect to 75% of the Fund's total assets, purchase the securities of any issuer, except securities issued or guaranteed by the U.S. government or any of its agencies or instrumentalities or securities of other investment companies, if, as a result, (i) more than 5% of the Fund's total assets would be invested in the securities of that issuer, or (ii) the Fund would hold more than 10% of the outstanding voting securities of that issuer. For the purpose of this restriction, each state and each separate political subdivision, agency, authority or instrumentality of such state, each multi-state agency or authority, and each guarantor, if any, are treated as separate issuers of municipal bonds.

The Fund's industry concentration policy does not preclude it from focusing investments in issuers in a group of related industries (such as different types of utilities).

The Fund may become subject to guidelines which are more limiting than the investment restrictions set forth above or in the Statement of Additional Information in order to obtain and maintain ratings from Moody's or S&P on the Preferred Shares that it intends to issue. The Fund does not anticipate that such guidelines would have a material adverse effect on the Fund's Common Shareholders or the Fund's ability to achieve its investment objective. See "Investment objective and policies" and "Investment restrictions" in the Statement of Additional Information for information about these guidelines and a complete list of the fundamental investment policies of the Fund.

QUALITY OF INVESTMENTS

The Fund will invest at least 80% of its net assets in bonds of investment grade quality at the time of investment. Investment grade quality means that such bonds are rated by national rating agencies within the four highest grades (Baa or BBB or better by Moody's, S&P or Fitch) or are unrated but judged to be of comparable quality by PIMCO.

LIMITED ISSUANCE OF PREFERRED SHARES

Under the 1940 Act, the Fund could issue Preferred Shares having a total liquidation value (original purchase price of the shares being liquidated plus any accrued and unpaid dividends) of up to one-half of the value of the total net assets of the Fund. If the total liquidation value of the Preferred Shares were ever more than one-half of the value of the Fund's total net assets, the Fund would not be able to declare dividends on the Common Shares until the liquidation value, as a percentage of the Fund's assets, were reduced. The Fund intends to issue Preferred Shares representing about 35% of the Fund's total capital approximately one to three months after the completion of the offering of Common Shares, if the Fund sells all the Common Shares discussed in this Prospectus. This higher than required margin of net asset value provides a cushion against later fluctuations in the value of the Fund's portfolio and will subject Common Shareholders to less income and net asset value volatility than if the Fund were more highly leveraged. The Fund intends to purchase or redeem Preferred Shares, if necessary, to keep the liquidation value of the Preferred Shares below one-half of the value of the Fund's total net assets.


17

How the Fund manages risk


MANAGEMENT OF INVESTMENT PORTFOLIO AND CAPITAL STRUCTURE TO LIMIT LEVERAGE RISK

The Fund may take certain actions if short-term interest rates increase or market conditions otherwise change (or the Fund anticipates such an increase or change) and the Fund's leverage begins (or is expected) to adversely affect Common Shareholders. In order to attempt to offset such a negative impact of leverage on Common Shareholders, the Fund may shorten the average maturity or duration of its investment portfolio (by investing in shorter-term, high quality securities) or may extend the maturity of outstanding Preferred Shares. The Fund may also attempt to reduce leverage by redeeming or otherwise purchasing Preferred Shares or by reducing any holdings in RIBS or other instruments that create leverage. As explained above under "Risks--Leverage Risk," the success of any such attempt to limit leverage risk depends on PIMCO's ability to accurately predict interest rate or other market changes. Because of the difficulty of making such predictions, the Fund may not be successful in managing its interest rate exposure in the manner described above.

If market conditions suggest that additional leverage would be beneficial, the Fund may sell previously unissued Preferred Shares or Preferred Shares that the Fund previously issued but later repurchased, or utilize other forms of leverage, such as RIBS or other derivative instruments.

HEDGING AND RELATED STRATEGIES

The Fund may use various investment strategies designed to limit the risk of bond price fluctuations and to preserve capital. For instance, the Fund may invest in structured notes for the purpose of reducing the interest rate sensitivity of the Fund's portfolio and, thereby, decreasing the Fund's exposure to interest rate risk. The Fund currently intends that the income on these notes will normally be exempt from federal income tax. Other hedging strategies that the Fund may use include: financial futures contracts; short sales; swap agreements or options thereon; options on financial futures; and options based on either an index of municipal securities or on taxable debt securities whose prices, PIMCO believes, correlate with the prices of the Fund's investments. Income earned by the Fund from many hedging activities will be treated as capital gain and, if not offset by net realized capital loss, will be distributed to shareholders in taxable distributions. If effectively used, hedging strategies will offset in varying percentages losses incurred on the Fund's investments due to adverse interest rate changes. There is no assurance that these hedging strategies will be available at any time or that PIMCO will determine to use them for the Fund.

Management of the Fund

TRUSTEES AND OFFICERS

The Board of Trustees is responsible for the management of the Fund, including supervision of the duties performed by PIMCO Advisors and PIMCO. There are currently three Trustees of the Fund, one of whom is an "interested person" (as defined in the 1940 Act) and two of whom are not "interested persons." The names and business addresses of the Trustees and officers of the Fund and their principal occupations and other affiliations during the past five years are set forth under "Management of the Fund" in the Statement of Additional Information.

INVESTMENT MANAGER

PIMCO Advisors serves as the investment manager of the Fund. Subject to the supervision of the Board of Trustees, PIMCO Advisors is responsible for managing, either directly or through others selected by it, the investment activities of the Fund and the Fund's business affairs and other administrative matters. PIMCO Advisors is located at 1345 Avenue of the Americas, New York, New York 10105.


18

Management of the Fund


Organized in 1987, PIMCO Advisors provides investment management and advisory services to private accounts of institutional and individual clients and to mutual funds. As of March 31, 2001, PIMCO Advisors and its subsidiary partnerships had approximately $275 billion in assets under management.

PIMCO Advisors has retained its affiliate, PIMCO, to manage the Fund's investments. See "Portfolio Manager" below. PIMCO Advisors and PIMCO are each majority-owned indirect subsidiaries of Allianz AG, a publicly traded German insurance and financial services company.

PORTFOLIO MANAGER

PIMCO serves as the portfolio manager for the Fund. Subject to the supervision of PIMCO Advisors, PIMCO has full investment discretion and makes all determinations with respect to the investment of the Fund's assets.

PIMCO is located at 840 Newport Center Drive, Newport Beach, California 92660. Organized in 1971, PIMCO provides investment management and advisory services to private accounts of institutional and individual clients and to mutual funds. As of March 31, 2001, PIMCO had approximately $220 billion in assets under management.

PIMCO Advisors (and not the Fund) pays a portion of the fees it receives to PIMCO in return for its services, at the maximum annual rate of 0.37% of the Fund's average daily net assets (including assets attributable to any Preferred Shares that may be outstanding). PIMCO has contractually agreed to waive a portion of the advisory fee it is entitled to receive from PIMCO Advisors such that PIMCO will receive 0.25% of the Fund's average daily net assets from the commencement of Fund operations through June 30, 2006 (i.e., roughly the first 5 years of Fund operations), 0.28% of average daily net assets in year 6, 0.31% in year 7, and 0.34% in year 8.

The following individual at PIMCO has primary responsibility for the day-to-day portfolio management of the Fund.

                     Since               Recent Professional Experience
-------------------------------------------------------------------------------
 Mark V. McCray 2001 (Inception) Executive Vice President, PIMCO. He joined
                                 PIMCO as a Portfolio Manager in 2000. Prior to
                                 that, he was a bond trader from 1992-1999 at
                                 Goldman Sachs & Co. where he was appointed
                                 Vice President in 1996 and named co-head of
                                 municipal bond trading in 1997 with
                                 responsibility for the firm's proprietary
                                 account and supervised municipal bond traders.

Chris Dialynas, a Managing Director and senior member of PIMCO's investment strategy group, oversees Mr. McCray regarding the management of the Fund.

INVESTMENT MANAGEMENT AGREEMENT

Pursuant to an investment management agreement between PIMCO Advisors and the Fund, the Fund has agreed to pay PIMCO Advisors an annual management fee payable on a monthly basis at the annual rate of 0.65% of the Fund's average daily net assets (including net assets attributable to Preferred Shares) for the services and facilities it provides.

In addition to the fees of PIMCO Advisors, the Fund pays all other costs and expenses of its operations, including compensation of its trustees (other than those affiliated with PIMCO Advisors), custodial expenses, shareholder servicing expenses, transfer agency and dividend disbursing expenses,


19

Management of the Fund


legal fees, expenses of independent auditors, expenses of repurchasing shares, expenses of issuing any Preferred Shares, expenses of preparing, printing and distributing prospectuses, shareholder reports, notices, proxy statements and reports to governmental agencies, and taxes, if any.

PIMCO Advisors has contractually agreed to waive a portion of the management fees it is entitled to receive from the Fund in the amounts, and for the time periods, set forth below (covering commencement of Fund operations through June 30, 2009):

                                                               Percentage Waived
                                                    (annual rate as a percentage
Period Ending June 30,                          of average daily net assets) (1)
--------------------------------------------------------------------------------
2002 (2).......................................                            0.20%
2003...........................................                            0.20%
2004...........................................                            0.20%
2005...........................................                            0.20%
2006...........................................                            0.20%
2007...........................................                            0.15%
2008...........................................                            0.10%
2009...........................................                            0.05%


(1) Including net assets attributable to Preferred Shares.

(2) From the commencement of the Fund's operations.

PIMCO Advisors has not agreed to waive any portion of its fees beyond June 30, 2009.

Because the fees received by PIMCO Advisors are based on the total net assets of the Fund (including assets represented by Preferred Shares and any leverage created thereby), PIMCO Advisors has a financial incentive for the Fund to issue Preferred Shares, which may create a conflict of interest between PIMCO Advisors and the holders of the Fund's Common Shares.

Net asset value

The net asset value ("NAV") of the Fund equals the total value of the Fund's portfolio investments and other assets, less any liabilities. For purposes of calculating NAV, portfolio securities and other assets for which market quotes are available are stated at market value. Market value is generally determined on the basis of the last reported sales price, or if no sales are reported, based on quotes obtained from a quotation reporting system, established market makers, or pricing services. Certain securities or investments for which market quotations are not readily available (which is usually the case for municipal bonds) may be valued, pursuant to guidelines established by the Board of Trustees, with reference to other securities or indices. For instance, a pricing service may recommend a fair market value based on prices of comparable municipal bonds. Short-term investments having a maturity of 60 days or less are generally valued at amortized cost. Exchange traded options, futures and options on futures are valued at the settlement price determined by the exchange. Other securities for which market quotes are not readily available are valued at fair value as determined in good faith by the Board of Trustees or persons acting at their direction.

The NAV of the Fund will be determined as of the close of regular trading (normally 4:00 p.m., Eastern time) (the "NYSE Close") on each day the New York Stock Exchange is open. Domestic fixed income securities are normally priced using data reflecting the earlier closing of the principal markets for those securities. Information that becomes known to the Fund or its agent after the NAV has been calculated on a particular day will not generally be used to retroactively adjust the price of a security or the NAV determined earlier that day.


20

Net asset value


In unusual circumstances, instead of valuing securities in the usual manner, the Fund may value securities at fair value or estimate their value as determined in good faith by the Board of Trustees, generally based upon recommendations provided by PIMCO. Fair valuation may also be used if extraordinary events occur after the close of the relevant market but prior to the NYSE Close.

Distributions

Commencing with the first dividend, the Fund intends to make regular monthly cash distributions to Common Shareholders at a level rate based upon the projected performance of the Fund. Distributions can only be made from net investment income after paying any accrued dividends to Preferred Shareholders. The Fund's ability to maintain a level dividend rate will depend on a number of factors, including dividends payable on the Preferred Shares. The net income of the Fund consists of all interest income accrued on portfolio assets less all expenses of the Fund. Expenses of the Fund are accrued each day. Over time, substantially all the net investment income of the Fund will be distributed. At least annually, the Fund also intends to distribute to you your pro rata share of any available net capital gain and ordinary taxable income. Initial distributions to Common Shareholders are expected to be declared approximately 45 days, and paid approximately 60 to 90 days, from the completion of this offering, depending on market conditions. Although it does not now intend to do so, the Board of Trustees may change the Fund's dividend policy and the amount or timing of the distributions, based on a number of factors, including the amount of the Fund's undistributed net investment income and historical and projected investment income and the amount of the expenses and dividend rates on any outstanding Preferred Shares.

To permit the Fund to maintain a more stable monthly distribution, the Fund will initially distribute less than the entire amount of net investment income earned in a particular period. The undistributed net investment income would be available to supplement future distributions. As a result, the distributions paid by the Fund for any particular monthly period may be more or less than the amount of net investment income actually earned by the Fund during the period. Undistributed net investment income will be added to the Fund's net asset value and, correspondingly, distributions from undistributed net investment income will be deducted from the Fund's net asset value.

Dividend reinvestment plan

Pursuant to the Fund's Dividend Reinvestment Plan (the "Plan"), all Common Shareholders whose shares are registered in their own names will have all dividends, including any capital gain dividends, reinvested automatically in additional Common Shares by PFPC Inc., as agent for the Common Shareholders (the "Plan Agent"), unless the shareholder elects to receive cash. An election to receive cash may be revoked or reinstated at the option of the shareholder. In the case of record shareholders such as banks, brokers or other nominees that hold Common Shares for others who are the beneficial owners, the Plan Agent will administer the Plan on the basis of the number of Common Shares certified from time to time by the record shareholder as representing the total amount registered in such shareholder's name and held for the account of beneficial owners who are to participate in the Plan. Shareholders whose shares are held in the name of a bank, broker or nominee should contact the bank, broker or nominee for details. All distributions to investors who elect not to participate in the Plan (or whose broker or nominee elects not to participate on the investor's behalf), will be paid in cash by check mailed, in the case of direct shareholders, to the record holder by PFPC Inc., as the Fund's dividend disbursment agent.


21

Dividend reinvestment plan


Unless you (or your broker or nominee) elects not to participate in the Plan, the number of Common Shares you will receive will be determined as follows:

(1) If Common Shares are trading at or above net asset value on the payment date, the Fund will issue new shares at the greater of (i) the net asset value per Common Share on the payment date or (ii) 95% of the market price per Common Share on the payment date; or

(2) If Common Shares are trading below net asset value (minus estimated brokerage commissions that would be incurred upon the purchase of Common Shares on the open market) on the payment date, the Plan Agent will receive the dividend or distribution in cash and will purchase Common Shares in the open market, on the New York Stock Exchange or elsewhere, for the participants' accounts. It is possible that the market price for the Common Shares may increase before the Plan Agent has completed its purchases. Therefore, the average purchase price per share paid by the Plan Agent may exceed the market price on the payment date, resulting in the purchase of fewer shares than if the dividend or distribution had been paid in Common Shares issued by the Fund. The Plan Agent will use all dividends and distributions received in cash to purchase Common Shares in the open market on or shortly after the payment date, but in no event later than the ex-dividend date for the next distribution. Interest will not be paid on any uninvested cash payments.

You may withdraw from the Plan at any time by giving notice to the Plan Agent. If you withdraw or the Plan is terminated, you will receive a certificate for each whole share in your account under the Plan and you will receive a cash payment for any fraction of a share in your account. If you wish, the Plan Agent will sell your shares and send you the proceeds, minus brokerage commissions.

The Plan Agent maintains all shareholders' accounts in the Plan and gives written confirmation of all transactions in the accounts, including information you may need for tax records. The Plan Agent will also furnish each person who buys Common Shares with written instructions detailing the procedures for electing not to participate in the Plan and to instead receive distributions in cash. Common Shares in your account will be held by the Plan Agent in non- certificated form. Any proxy you receive will include all Common Shares you have received under the Plan.

There is no brokerage charge for reinvestment of your dividends or distributions in Common Shares. However, all participants will pay a pro rata share of brokerage commissions incurred by the Plan Agent when it makes open market purchases.

Automatically reinvested dividends and distributions are taxed in the same manner as cash dividends and distributions.

The Fund and the Plan Agent reserve the right to amend or terminate the Plan. There is no direct service charge to participants in the Plan; however, the Fund reserves the right to amend the Plan to include a service charge payable by the participants. Additional information about the Plan may be obtained from PFPC Inc., 400 Belleview Parkway, Wilmington, DE 19809, telephone number 1-800- 331-1710.


22


Description of shares

COMMON SHARES

The Declaration authorizes the issuance of an unlimited number of Common Shares. The Common Shares will be issued without par value. All Common Shares have equal rights to the payment of dividends and the distribution of assets upon liquidation. Common Shares will, when issued, be fully paid and, subject to matters discussed in "Certain provisions in the Declaration of Trust," non- assessable, and will have no pre-emptive or conversion rights or rights to cumulative voting. Whenever Preferred Shares are outstanding, Common Shareholders will not be entitled to receive any distributions from the Fund unless all accrued dividends on Preferred Shares have been paid, and unless asset coverage (as defined in the 1940 Act) with respect to Preferred Shares would be at least 200% after giving effect to the distributions. See "Preferred Shares" below.

The Common Shares have been approved for lising on the New York Stock Exchange, subject to notice of issuance. The Fund intends to hold annual meetings of shareholders so long as the Common Shares are listed on a national securities exchange and such meetings are required as a condition to such listing.

The Fund's net asset value per share generally increases when interest rates decline, and decreases when interest rates rise, and these changes are likely to be greater because the Fund intends to have a leveraged capital structure. Net asset value will be reduced immediately following the offering by the amount of the sales load and organization and offering expenses paid by the Fund. PIMCO Advisors has agreed to pay the amount by which the aggregate of all of the Fund's organizational expenses and all offering costs (other than the sales load) exceeds $0.03 per Common Share.

Unlike open-end funds, closed-end funds like the Fund do not continuously offer shares and do not provide daily redemptions. Rather, if a shareholder determines to buy additional Common Shares or sell shares already held, the shareholder may do so by trading on the exchange through a broker or otherwise. Shares of closed-end investment companies may frequently trade on an exchange at prices lower than net asset value. Shares of closed-end investment companies like the Fund that invest predominantly in investment grade municipal bonds have during some periods traded at prices higher than net asset value and during other periods have traded at prices lower than net asset value. The Fund's Declaration limits the ability of the Fund to convert to open-end status. See "Certain provisions in the Declaration of Trust."

Because the market value of the Common Shares may be influenced by such factors as dividend levels (which are in turn affected by expenses), call protection, dividend stability, portfolio credit quality, net asset value, relative demand for and supply of such shares in the market, general market and economic conditions, and other factors beyond the control of the Fund, the Fund cannot assure you that the Common Shares will trade at a price equal to or higher than net asset value in the future. The Common Shares are designed primarily for long-term investors, and investors in the Common Shares should not view the Fund as a vehicle for trading purposes. See "Preferred shares and related leverage" and the Statement of Additional Information under "Repurchase of Fund shares; conversion to open-end fund."

PREFERRED SHARES

The Declaration authorizes the issuance of an unlimited number of Preferred Shares. The Preferred Shares will be issued in one or more classes or series, with such par value and rights as determined by the Board of Trustees, by action of the Board of Trustees without the approval of the Common Shareholders.


23

Description of shares


The Fund's Board of Trustees has indicated its intention to authorize an offering of Preferred Shares (representing approximately 35% of the Fund's capital immediately after the time the Preferred Shares are issued) approximately one to three months after completion of the offering of Common Shares. Any such decision is subject to market conditions and to the Board's continuing belief that leveraging the Fund's capital structure through the issuance of Preferred Shares is likely to achieve the benefits to the Common Shareholders described in this Prospectus. Although the terms of the Preferred Shares will be determined by the Board of Trustees (subject to applicable law and the Fund's Declaration) if and when it authorizes a Preferred Shares offering, the Board has determined that the Preferred Shares, at least initially, would likely pay cumulative dividends at rates determined over relatively shorter-term periods (such as 7 days), by providing for the periodic redetermination of the dividend rate through an auction or remarketing procedure. The Board of Trustees has indicated that the preference on distribution, liquidation preference, voting rights and redemption provisions of the Preferred Shares will likely be as stated below.

Limited Issuance of Preferred Shares
Under the 1940 Act, the Fund could issue Preferred Shares with an aggregate liquidation value of up to one-half of the value of the Fund's total net assets, measured immediately after issuance of the Preferred Shares. "Liquidation value" means the original purchase price of the shares being liquidated plus any accrued and unpaid dividends. In addition, the Fund is not permitted to declare any cash dividend or other distribution on its Common Shares unless the liquidation value of the Preferred Shares is less than one- half of the value of the Fund's total net assets (determined after deducting the amount of such dividend or distribution) immediately after the distribution. If the Fund sells all the Common Shares and Preferred Shares discussed in this Prospectus, the liquidation value of the Preferred Shares is expected to be approximately 35% of the value of the Fund's total net assets. The Fund intends to purchase or redeem Preferred Shares, if necessary, to keep that fraction below one-half.

Distribution Preference
The Preferred Shares have complete priority over the Common Shares as to distribution of assets.

Liquidation Preference
In the event of any voluntary or involuntary liquidation, dissolution or winding up of the affairs of the Fund, holders of Preferred Shares will be entitled to receive a preferential liquidating distribution (expected to equal the original purchase price per share plus accumulated and unpaid dividends thereon, whether or not earned or declared) before any distribution of assets is made to holders of Common Shares.

Voting Rights
Preferred Shares are required to be voting shares. Except as otherwise provided in the Declaration or the Fund's By-Laws or otherwise required by applicable law, holders of Preferred Shares will vote together with Common Shareholders as a single class.

Holders of Preferred Shares, voting as a separate class, will also be entitled to elect two of the Fund's trustees. The remaining trustees will be elected by Common Shareholders and holders of Preferred Shares, voting together as a single class. In the unlikely event that two full years of accrued dividends are unpaid on the Preferred Shares, the holders of all outstanding Preferred Shares, voting as a separate class, will be entitled to elect a majority of the Fund's trustees until all dividends in arrears have been paid or declared and set apart for payment.


24

Description of shares


Redemption, Purchase and Sale of Preferred Shares The terms of the Preferred Shares may provide that they are redeemable at certain times, in whole or in part, at the original purchase price per share plus accumulated dividends. The terms may also state that the Fund may tender for or purchase Preferred Shares and resell any shares so tendered. Any redemption or purchase of Preferred Shares by the Fund will reduce the leverage applicable to Common Shares, while any resale of shares by the Fund will increase such leverage. See "Preferred shares and related leverage."

The discussion above describes the Board of Trustees' present intention with respect to a possible offering of Preferred Shares. If the Board of Trustees determines to authorize such an offering, the terms of the Preferred Shares may be the same as, or different from, the terms described above, subject to applicable law and the Fund's Declaration and By-Laws.

Certain provisions in the Declaration of Trust

The Declaration includes provisions that could limit the ability of other entities or persons to acquire control of the Fund or to convert the Fund to open-end status. Commencing with the first annual meeting of shareholders, the Board of Trustees will be divided into three classes. At each annual meeting of shareholders, the term of one class will expire and each Trustee elected to that class will hold office for a term of three years. The classification of the Board of Trustees in this manner could delay for an additional year the replacement of a majority of the Board of Trustees. In addition, the Declaration provides that a Trustee may be removed only for cause and only (i) by action of at least seventy-five percent (75%) of the outstanding shares of the classes or series of shares entitled to vote for the election of such Trustee, or (ii) by at least seventy-five percent (75%) of the remaining Trustees.

In addition, the Declaration requires the affirmative vote or consent of at least seventy-five percent (75%) of the Board of Trustees and holders of at least seventy-five percent (75%) of the Fund's shares (including Common and Preferred Shares) to authorize certain Fund transactions not in the ordinary course of business (including a merger or consolidation, or sale or transfer of Fund securities or assets), unless the transaction is authorized by both a majority of the Trustees and seventy-five percent (75%) of those Trustees or their successors ("Continuing Trustees") who are not affiliated with the other party to the transaction (in which case no shareholder authorization would be required by the Declaration). The Declaration also requires the affirmative vote or consent of holders of at least seventy-five percent (75%) of each class of the Fund's shares entitled to vote on the matter to authorize a conversion of the Fund from a closed-end to an open-end investment company, unless the conversion is authorized by both a majority of the Trustees and seventy-five percent (75%) of the Continuing Trustees (in which case shareholders would have only the minimum voting rights required by the 1940 Act with respect to the conversion). Also, the Declaration provides that the Fund may be terminated at any time by vote or consent of at least seventy-five percent (75%) of the Fund's shares or, alternatively, by vote or consent of both a majority of the Trustees and seventy-five percent (75%) of the Continuing Trustees. See "Certain provisions in the Declaration of Trust" in the Statement of Additional Information for a more detailed summary of these provisions. The Trustees may from time to time grant other voting rights to shareholders with respect to these and other matters in the Fund's By-Laws.

The overall effect of these provisions is to render more difficult the accomplishment of a merger or the assumption of control by a third party. They provide, however, the advantage of potentially requiring persons seeking control of the Fund to negotiate with its management regarding the price to be paid and facilitating the continuity of the Fund's investment objective and policies. The provisions of the Declaration described above could have the effect of depriving the Common Shareholders of opportunities to sell their Common Shares at a premium over the then current market price of the Common Shares by discouraging a third party from seeking to obtain control of the Fund in a tender


25

Certain provisions in the Declaration of Trust


offer or similar transaction. The Board of Trustees of the Fund has considered the foregoing anti-takeover provisions and concluded that they are in the best interests of the Fund and its Common Shareholders.

The foregoing is intended only as a summary and is qualified in its entirety by reference to the full text of the Declaration and the Fund's By-Laws, both of which are on file with the Securities and Exchange Commission.

Under Massachusetts law, shareholders could, in certain circumstances, be held personally liable for the obligations of the Fund. However, the Declaration contains an express disclaimer of shareholder liability for debts or obligations of the Fund and requires that notice of such limited liability be given in each agreement, obligation or instrument entered into or executed by the Fund or the Trustees. The Declaration further provides for indemnification out of the assets and property of the Fund for all loss and expense of any shareholder held personally liable for the obligations of the Fund. Thus, the risk of a shareholder incurring financial loss on account of shareholder liability is limited to circumstances in which the Fund would be unable to meet its obligations. The Fund believes that the likelihood of such circumstances is remote.

Repurchase of Fund shares; conversion to open-end fund

The Fund is a closed-end investment company and as such its shareholders will not have the right to cause the Fund to redeem their shares. Instead, the Common Shares will trade in the open market at a price that will be a function of several factors, including dividend levels (which are in turn affected by expenses), net asset value, call protection, dividend stability, portfolio credit quality, relative demand for and supply of such shares in the market, general market and economic conditions and other factors. Shares of a closed- end investment company may frequently trade at prices lower than net asset value. The Fund's Board of Trustees regularly monitors the relationship between the market price and net asset value of the Common Shares. If the Common Shares were to trade at a substantial discount to net asset value for an extended period of time, the Board may consider the repurchase of its Common Shares on the open market or in private transactions, the making of a tender offer for such shares, or the conversion of the Fund to an open-end investment company. The Fund cannot assure you that its Board of Trustees will decide to take or propose any of these actions, or that share repurchases or tender offers will actually reduce market discount.

If the Fund converted to an open-end company, it would be required to redeem all Preferred Shares then outstanding (requiring in turn that it liquidate a portion of its investment portfolio), and the Common Shares would likely no longer be listed on the New York Stock Exchange. In contrast to a closed-end investment company, shareholders of an open-end investment company may require the company to redeem their shares at any time (except in certain circumstances as authorized by or under the 1940 Act) at their net asset value, less any redemption charge that is in effect at the time of redemption.

Before deciding whether to take any action if the Common Shares trade below net asset value, the Board would consider all relevant factors, including the extent and duration of the discount, the liquidity of the Fund's portfolio, the impact of any action that might be taken on the Fund or its shareholders, and market considerations. Based on these considerations, even if the Fund's shares should trade at a discount, the Board of Trustees may determine that, in the interest of the Fund and its shareholders, no action should be taken. See the Statement of Additional Information under "Repurchase of Fund shares; conversion to open-end fund" for a further discussion of possible action to reduce or eliminate such discount to net asset value.


26

Tax matters


Tax matters

FEDERAL INCOME TAX MATTERS

The following federal income tax discussion is based on the advice of Ropes & Gray, counsel to the Fund, and reflects provisions of the Internal Revenue Code of 1986, as amended (the "Code"), existing treasury regulations, rulings published by the Internal Revenue Service (the "Service"), and other applicable authority, as of the date of this Prospectus. These authorities are subject to change by legislative or administrative action. The following discussion is only a summary of some of the important tax considerations generally applicable to investments in the Fund. For more detailed information regarding tax considerations, see the Statement of Additional Information. There may be other tax considerations applicable to particular investors. In addition, income earned through an investment in the Fund may be subject to state and local taxes.

The Fund intends to qualify each year for taxation as a regulated investment company eligible for treatment under the provisions of Subchapter M of the Code. If the Fund so qualifies and satisfies certain distribution requirements, the Fund will not be subject to federal income tax on income distributed in a timely manner to its shareholders in the form of dividends or capital gain distributions.

To satisfy the distribution requirement applicable to regulated investment companies, amounts paid as dividends by the Fund to its shareholders, including holders of its Preferred Shares, must qualify for the dividends-paid deduction. In certain circumstances, the Service could take the position that dividends paid on the Preferred Shares constitute preferential dividends under Section 562(c) of the Code, and thus do not qualify for the dividends-paid deduction.

If at any time when Preferred Shares are outstanding the Fund does not meet applicable asset coverage requirements, it will be required to suspend distributions to Common Shareholders until the requisite asset coverage is restored. Any such suspension may cause the Fund to pay a 4% federal excise tax (imposed on regulated investment companies that fail to distribute for a given calendar year, generally, at least 98% of their net investment income and capital gain net income) and income tax on undistributed income or gains, and may, in certain circumstances, prevent the Fund from qualifying for treatment as a regulated investment company. The Fund may redeem Preferred Shares in an effort to comply with the distribution requirement applicable to regulated investment companies and to avoid income and excise taxes.

The Fund primarily invests in municipal bonds issued by states, cities and local authorities and certain possessions and territories of the United States (such as Puerto Rico or Guam) or in municipal bonds whose income is otherwise exempt from federal income taxes. Thus, substantially all of the Fund's dividends to you will qualify as "exempt-interest dividends," which are not generally subject to federal income tax. An investment in the Fund may result in liability for federal alternative minimum tax for corporate shareholders. The Fund will seek to avoid portfolio investments that pay interest that is taxable to individuals under the federal alternative minimum tax. Nonetheless, the Fund may not be successful in this regard and if you are, or as a result of an investment in the Fund would become, subject to the federal alternative minimum tax, the Fund may not be a suitable investment for you.

As described above in the section entitled "Preferred shares and related leverage," the terms of the Preferred Shares require, in certain circumstances, that the Fund distribute Gross-up Dividends to holders of the Preferred Shares. It is anticipated that the allocation rules described in the noted section will in a number of circumstances require the Fund to distribute such Gross-up Dividends. Such Gross-up Dividends would reduce the amount available for distribution to Common Shareholders.


27

Tax matters


The Fund may at times buy tax-exempt investments at a discount from the price at which they were originally issued, especially during periods of rising interest rates. For federal income tax purposes, some or all of this market discount will be included in the Fund's ordinary income and will be taxable to shareholders as such when it is distributed.

The Fund's investments in certain debt obligations may cause the Fund to recognize taxable income in excess of the cash generated by such obligations. Thus, the Fund could be required at times to liquidate other investments in order to satisfy its distribution requirements.

For federal income tax purposes, distributions of investment income other than exempt interest dividends are taxable as ordinary income. Generally, gains realized by the Fund on the sale or exchange of investments will be taxable to its shareholders, even though the income from such investments generally will be tax-exempt. Whether distributions of capital gains are taxed as ordinary income or capital gains is determined by how long the Fund owned the investments that generated such capital gains, rather than how long a shareholder has owned his or her shares. Distributions are taxable to shareholders even if they are paid from income or gains earned by the Fund before a shareholder's investment (and thus were included in the price the shareholder paid). Distributions of gains from the sale of investments that the Fund owned for more than one year will be taxable as capital gains. Distributions of gains from the sale of investments that the Fund owned for one year or less will be taxable as ordinary income. Distributions are taxable whether shareholders receive them in cash or reinvest them in additional shares through the Dividend Reinvestment Plan.

Any gain resulting from the sale or exchange of Fund shares will generally also be subject to tax. In addition, the exemption from federal income tax for exempt-interest dividends does not necessarily result in exemption for such dividends under the income or other tax laws of any state or local taxing authority. You should consult your tax advisor for more information on your own tax situation, including possible state and local taxes.

Underwriting

The underwriters named below (the "Underwriters"), acting through UBS Warburg LLC, 299 Park Avenue, New York, New York, as lead manager, and CIBC World Markets Corp. and A.G. Edwards & Sons, Inc. as their representatives (the "Representatives"), have severally agreed, subject to the terms and conditions of the Underwriting Agreement with the Fund and PIMCO Advisors, to purchase from the Fund the number of Common Shares set forth opposite their respective names. The Underwriters are committed to purchase and pay for all of such Common Shares (other than those covered by the over-allotment option described below) if any are purchased.

                                                                       Number of
Underwriter                                                        Common Shares
--------------------------------------------------------------------------------
UBS Warburg LLC...................................................
CIBC World Markets Corp...........................................
A.G. Edwards & Sons, Inc..........................................
  Total...........................................................

The Fund has granted to the Underwriters an option, exercisable for 45 days from the date of this Prospectus, to purchase up to an additional Common Shares to cover over-allotments, if any, at the initial offering price. The Underwriters may exercise such option solely for the purpose of covering


28

Underwriting


over-allotments incurred in the sale of the Common Shares offered hereby. To the extent that the Underwriters exercise this option, each of the Underwriters will have a firm commitment, subject to certain conditions, to purchase an additional number of Common Shares proportionate to such Underwriter's initial commitment.

The Fund has agreed to pay a commission to the Underwriters in the amount of up to $ per Common Share ( % of the public offering price per Common Share). The Representatives have advised the Fund that the Underwriters may pay up to $ per Common Share from such commission to selected dealers who sell the Common Shares and that such dealers may reallow a concession of up to $ per Common Share to certain other dealers who sell shares. Investors must pay for any Common Shares purchased on or before [closing date], 2001.

Prior to this offering, there has been no public or private market for the Common Shares or any other securities of the Fund. Consequently, the offering price for the Common Shares was determined by negotiation among the Fund, PIMCO Advisors and the Representatives. There can be no assurance, however, that the price at which Common Shares sell after this offering will not be lower than the price at which they are sold by the Underwriters or that an active trading market in the Common Shares will develop and continue after this offering. The minimum investment requirement is 100 Common Shares.

The Fund and PIMCO Advisors have agreed to indemnify the several Underwriters for or to contribute to the losses arising out of certain liabilities, including liabilities under the Securities Act of 1933, as amended.

The Fund has agreed not to offer, sell or register with the Securities and Exchange Commission any equity securities of the Fund, other than issuances of Common Shares, including pursuant to the Fund's Dividend Reinvestment Plan, and issuances in connection with any offering of Preferred Shares, each as contemplated in this Prospectus, for a period of 180 days after the date of the Underwriting Agreement without the prior written consent of the Representatives.

The Representatives have informed the Fund that the Underwriters do not intend to confirm any sales to any accounts over which they exercise discretionary authority.

In connection with this offering, the Underwriters may purchase and sell Common Shares in the open market. These transactions may include over-allotment and stabilizing transactions and purchases to cover syndicate short positions created in connection with this offering. Stabilizing transactions consist of certain bids or purchases for the purpose of preventing or retarding a decline in the market price of the Common Shares and syndicate short positions involve the sale by the Underwriters of a greater number of Common Shares than they are required to purchase from the Fund in this offering. The Underwriters also may impose a penalty bid, whereby selling concessions allowed to syndicate members or other broker-dealers in respect of the Common Shares sold in this offering for their account, may be reclaimed by the syndicate if such Common Shares are repurchased by the syndicate in stabilizing or covering transactions. These activities may stabilize, maintain or otherwise affect the market price of the Common Shares, which may be higher than the price that might otherwise prevail in the open market; and these activities, if commenced, may be discontinued at any time without notice. These transactions may be effected on the New York Stock Exchange or otherwise.

The Fund anticipates that the Representatives and certain other Underwriters may from time to time act as brokers and dealers in connection with the execution of its portfolio transactions after they have ceased to be Underwriters and, subject to certain restrictions, may act as such brokers while they are Underwriters.


29

Underwriting


PIMCO Advisors or an affiliate (and not the Fund) will pay to UBS Warburg LLC from its own resources additional compensation in connection with the offering of the Common Shares in the form of a structuring fee in an amount equal to $ .

Custodian and transfer agent

The custodian of the assets of the Fund is State Street Bank and Trust Co., 225 Franklin Street, Boston, MA 02110. The Custodian performs custodial and fund accounting services.

PFPC Inc., 400 Bellevue Parkway, Wilmington, DE 19809, serves as the Fund's transfer agent, registrar, dividend disbursment agent and shareholder servicing agent, as well as agent for the Fund's Dividend Reinvestment Plan.

Legal matters

Certain legal matters in connection with the Common Shares will be passed upon for the Fund by Ropes & Gray, Boston, Massachusetts, and for the Underwriters by Skadden, Arps, Slate, Meagher & Flom (Illinois), Chicago, Illinois, and its affiliated entities.


30


Table of contents for the
statement of additional information

Use of proceeds............................................................   3
Investment objective and policies..........................................   3
Investment restrictions....................................................  27
Management of the Fund.....................................................  29
Investment manager and portfolio manager...................................  33
Portfolio transactions.....................................................  38
Distributions..............................................................  40
Description of shares......................................................  41
Certain provisions in the Declaration of Trust.............................  44
Repurchase of Fund shares; conversion to open-end fund.....................  46
Tax matters................................................................  49
Performance related and comparative information............................  54
Custodian, transfer agent and dividend disbursing agent....................  55
Independent accountants....................................................  55
Counsel....................................................................  56
Registration statement.....................................................  57
Report of independent accountants..........................................  58
Financial statements.......................................................  59
Appendix A--Ratings of investments......................................... A-1
Appendix B--Performance related and comparative and other information...... B-1


31


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32


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33

[PIMCO FUNDS LOGO]


PIMCO MUNICIPAL INCOME FUND

STATEMENT OF ADDITIONAL INFORMATION

June [__], 2001

PIMCO Municipal Income Fund (the "Fund") is a newly organized, diversified closed-end management investment company.

This Statement of Additional Information relating to common shares of the Fund ("Common Shares") does not constitute a prospectus, but should be read in conjunction with the Fund's prospectus relating thereto dated June [__], 2001 (the "Prospectus"). This Statement of Additional Information does not include all information that a prospective investor should consider before purchasing Common Shares, and investors should obtain and read the Prospectus prior to purchasing such shares. A copy of the Prospectus may be obtained without charge by calling (877) 819-2224. You may also obtain a copy of the Prospectus on the Securities and Exchange Commission's ("SEC") web site (http://www.sec.gov). Capitalized terms used but not defined in this Statement of Additional Information have the meanings ascribed to them in the Prospectus.

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TABLE OF CONTENTS

USE OF PROCEEDS.........................................................    3
INVESTMENT OBJECTIVE AND POLICIES.......................................    3
INVESTMENT RESTRICTIONS.................................................   27
MANAGEMENT OF THE FUND..................................................   29
INVESTMENT MANAGER AND PORTFOLIO MANAGER................................   33
PORTFOLIO TRANSACTIONS..................................................   38
DISTRIBUTIONS...........................................................   40
DESCRIPTION OF SHARES...................................................   41
CERTAIN PROVISIONS IN THE DECLARATION OF TRUST..........................   44
REPURCHASE OF FUND SHARES; CONVERSION TO OPEN-END FUND..................   46
TAX MATTERS.............................................................   49
PERFORMANCE RELATED AND COMPARATIVE INFORMATION.........................   54
CUSTODIAN, TRANSFER AGENT AND DIVIDEND DISBURSING AGENT.................   55
INDEPENDENT ACCOUNTANTS.................................................   55
COUNSEL.................................................................   56
REGISTRATION STATEMENT..................................................   57
REPORT OF INDEPENDENT ACCOUNTANTS.......................................   58
FINANCIAL STATEMENTS....................................................   59
APPENDIX A - Ratings of Investments.....................................  A-1
APPENDIX B - Performance Related and Comparative and Other Information..  B-1

This Statement of Additional Information is dated June [__], 2001.

2

USE OF PROCEEDS

The net proceeds of the offering of Common Shares of the Fund will be approximately $[__](or $[__] if the Underwriters exercise the over-allotment option in full) after payment of organization and offering costs.

PIMCO Advisors L.P. ("PIMCO Advisors") has agreed to pay the amount by which the aggregate of all organizational expenses and offering costs (other than sales load) exceeds $0.03 per Common Share.

Pending investment in Municipal Bonds (as hereinafter defined) that meet the Fund's investment objective and policies, the net proceeds of the offering will be invested in high quality, short-term tax-exempt money market securities or in high quality Municipal Bonds with relatively low volatility (such as pre- refunded and intermediate-term bonds), to the extent such securities are available. If necessary to invest fully the net proceeds of the offering immediately, the Fund may also purchase, as temporary investments, short-term taxable investments of the type described under "Investment Objective and Policies--Short-Term Investments/Temporary Defensive Strategies," the income on which is subject to regular federal income tax and securities of other open- or closed-end investment companies that invest primarily in Municipal Bonds of the type in which the Fund may invest directly.

INVESTMENT OBJECTIVE AND POLICIES

The investment objective and general investment policies of the Fund are described in the Prospectus. Additional information concerning the characteristics of certain of the Fund's investments is set forth below.

Municipal Bonds

Under normal market conditions, the Fund expects to be fully invested (at least 90% of its total assets) in municipal bonds which pay interest that, in the opinion of bond counsel to the issuer (or on the basis of other authority believed by the Fund's portfolio manager to be reliable), is exempt from federal income taxes ("Municipal Bonds"). The Fund will seek to avoid bonds generating interest potentially subjecting individuals to the alternative minimum tax.

Municipal Bonds share the attributes of debt/fixed income securities in general, but are generally issued by states, municipalities and other political subdivisions, agencies, authorities and instrumentalities of states and multi- state agencies or authorities. The Municipal Bonds which the Fund may purchase include general obligation bonds and limited obligation bonds (or revenue bonds), including industrial development bonds issued pursuant to former federal tax law. General obligation bonds are obligations involving the credit of an issuer possessing taxing power and are payable from such issuer's general revenues and not from any particular source. Limited obligation bonds are payable only from the revenues derived from a particular facility or class of facilities or, in some cases, from the proceeds of a special excise or other specific revenue source. Tax-exempt private activity bonds and industrial development bonds generally are also revenue bonds and thus are not payable from the issuer's general revenues. The credit

3

and quality of private activity bonds and industrial development bonds are usually related to the credit of the corporate user of the facilities. Payment of interest on and repayment of principal of such bonds is the responsibility of the corporate user (and/or any guarantor).

The Fund will invest at least 80% of its net assets in Municipal Bonds that at the time of investment are investment grade quality. Investment grade quality bonds are bonds rated within the four highest grades (Baa or BBB or better by Moody's Investors Service, Inc. ("Moody's"), Standard & Poor's ("S&P") or Fitch IBCA, Inc. ("Fitch")) or bonds that are unrated but judged to be of comparable quality by the Fund's portfolio manager, Pacific Investment Management Company LLC ("PIMCO"). The Fund may invest up to 20% of its net assets in Municipal Bonds that, at the time of investment, are rated Ba/BB or B by Moody's, S&P or Fitch or unrated but judged to be of comparable quality by PIMCO. Bonds of below investment grade quality (Ba/BB or below) are commonly referred to as "junk bonds." For a description of the risks associated with lower quality securities, see "High Yield Securities ("Junk Bonds")" below.

The Fund will primarily invest in Municipal Bonds with long-term maturities in order to maintain a weighted average maturity of 15-30 years, but the average weighted maturity of obligations held by the Fund may be shortened, depending on market conditions. As a result, the Fund's portfolio at any given time may include both long-term and intermediate-term Municipal Bonds. Moreover, during temporary or defensive periods (e.g., times when PIMCO believes that temporary imbalances of supply and demand or other temporary dislocations in the tax- exempt bond market adversely affect the price at which long-term or intermediate-term Municipal Bonds are available), and in order to keep the Fund's cash fully invested, including the period during which the net proceeds of the offering are being invested, the Fund may invest any percentage of its net assets in short-term investments including high quality, short-term securities that may be either tax-exempt or taxable and up to 10% of its net assets in securities of other open- or closed-end investment companies that invest primarily in Municipal Bonds of the type in which the Fund may invest directly. The Fund intends to invest in taxable short-term investments only in the event that suitable tax-exempt short-term investments are not available at reasonable prices and yields. See "Tax Matters" for information relating to the allocation of taxable income between Common Shares and the Fund's preferred shares (called "Preferred Shares" herein), if any. Tax-exempt short-term investments include various obligations issued by state and local governmental issuers, such as tax-exempt notes (bond anticipation notes, tax anticipation notes and revenue anticipation notes or other such Municipal Bonds maturing in three years or less from the date of issuance) and municipal commercial paper. The Fund will invest only in taxable short-term investments which are U.S. Government securities or securities rated within the highest grade by Moody's, S&P or Fitch, and which mature within one year from the date of purchase or carry a variable or floating rate of interest. See Appendix A for a general description of Moody's, S&P's and Fitch's ratings of securities in such categories. Taxable short-term investments of the Fund may include certificates of deposit issued by U.S. banks with assets of at least $1 billion, or commercial paper or corporate notes, bonds or debentures with a remaining maturity of one year or less, or repurchase agreements. See "Short-Term Investments/Temporary Defensive Strategies." To the extent the Fund invests in taxable investments, the Fund will not at such times be in a position to achieve its investment objective.

4

Also included within the general category of Municipal Bonds in which the Fund may invest are participations in lease obligations or installment purchase contract obligations of municipal authorities or entities ("Municipal Lease Obligations"). Although a Municipal Lease Obligation does not constitute a general obligation of the municipality for which the municipality's taxing power is pledged, a Municipal Lease Obligation is ordinarily backed by the municipality's covenant to budget for, appropriate and make the payments due under the Municipal Lease Obligation. However, certain Municipal Lease Obligations contain "non-appropriation" clauses which provide that the municipality has no obligation to make lease or installment purchase payments in future years unless money is appropriated for such purpose on a yearly basis. In the case of a "non-appropriation" lease, the Fund's ability to recover under the lease in the event of non-appropriation or default will be limited solely to the repossession of the leased property, without recourse to the general credit of the lessee, and disposition or releasing of the property might prove difficult. There have been challenges to the legality of lease financing in numerous states, and, from time to time, certain municipalities have considered not appropriating money for lease payments. In deciding whether to purchase a Municipal Lease Obligation, PIMCO will assess the financial condition of the borrower, the merits of the project, the level of public support for the project, and the legislative history of lease financing in the state. These securities may be less readily marketable than other Municipal Bonds. The Fund may also purchase unrated lease obligations if determined by PIMCO to be of comparable quality to rated securities in which the Fund is permitted to invest.

The Fund may seek to enhance its yield through the purchase of private placements. These securities are sold through private negotiations, usually to institutions or mutual funds, and may have resale restrictions. Their yields are usually higher than comparable public securities to compensate the investor for their limited marketability. The Fund may not invest more than 15% of its net assets in illiquid securities, including unmarketable private placements.

Some longer-term Municipal Bonds give the investor the right to "put" or sell the security at par (face value) within a specified number of days following the investor's request--usually one to seven days. This demand feature enhances a security's liquidity by shortening its effective maturity and enables it to trade at a price equal to or very close to par. If a demand feature terminates prior to being exercised, the Fund would hold the longer-term security, which could experience substantially more volatility.

The Fund may invest in Municipal Bonds with credit enhancements such as letters of credit, municipal bond insurance and Standby Bond Purchase Agreements ("SBPAs"). Letters of credit are issued by a third party, usually a bank, to enhance liquidity and ensure repayment of principal and any accrued interest if the underlying Municipal Bond should default. Municipal bond insurance, which is usually purchased by the bond issuer from a private, nongovernmental insurance company, provides an unconditional and irrevocable guarantee that the insured bond's principal and interest will be paid when due. Insurance does not guarantee the price of the bond or the share price of the Fund. The credit rating of an insured bond reflects the credit rating of the insurer, based on its claims-paying ability. The obligation of a municipal bond insurance company to pay a claim extends over the life of each insured bond. Although defaults on insured Municipal Bonds have been low to date and municipal bond insurers have met their claims, there is no assurance this will continue. A higher-than- expected default rate could strain the insurer's loss reserves and adversely affect its ability to pay claims to bondholders. The

5

number of municipal bond insurers is relatively small, and not all of them have the highest rating. An SBPA is a liquidity facility provided to pay the purchase price of bonds that cannot be re-marketed. The obligation of the liquidity provider (usually a bank) is only to advance funds to purchase tendered bonds that cannot be remarketed and does not cover principal or interest under any other circumstances. The liquidity provider's obligations under the SBPA are usually subject to numerous conditions, including the continued creditworthiness of the underlying borrower.

The Fund also may invest in participation interests. Participation interests are various types of securities created by converting fixed rate bonds into short-term, variable rate certificates. These securities have been developed in the secondary market to meet the demand for short-term, tax-exempt securities. The Fund will invest only in securities deemed tax-exempt by a nationally recognized bond counsel, but there is no guarantee the interest will be exempt.

The Fund may also investment up to 10% of its assets in residual interest Municipal Bonds, which may involve leverage and related risks. See "Residual Interest Municipal Bonds (RIBS)" below.

The Fund may purchase custodial receipts representing the right to receive either the principal amount or the periodic interest payments or both with respect to specific underlying Municipal Bonds. In a typical custodial receipt arrangement, an issuer or third party owner of Municipal Bonds deposits the bonds with a custodian in exchange for two classes of custodial receipts. The two classes have different characteristics, but, in each case, payments on the two classes are based on payments received on the underlying Municipal Bonds. In no event will the aggregate interest paid with respect to the two classes exceed the interest paid by the underlying Municipal Bond. Custodial receipts are sold in private placements. The value of a custodial receipt may fluctuate more than the value of a Municipal Bond of comparable quality and maturity.

Municipal Bonds are subject to credit and market risk. Generally, prices of higher quality issues tend to fluctuate less with changes in market interest rates than prices of lower quality issues and prices of longer maturity issues tend to fluctuate more than prices of shorter maturity issues.

The Fund may purchase and sell portfolio investments to take advantage of changes or anticipated changes in yield relationships, markets or economic conditions. The Fund may also sell Municipal Bonds due to changes in PIMCO's evaluation of the issuer. The secondary market for Municipal Bonds typically has been less liquid than that for taxable debt/fixed income securities, and this may affect the Fund's ability to sell particular Municipal Bonds at then- current market prices, especially in periods when other investors are attempting to sell the same securities.

Prices and yields on Municipal Bonds are dependent on a variety of factors, including general money-market conditions, the financial condition of the issuer, general conditions of the Municipal Bond market, the size of a particular offering, the maturity of the obligation and the rating of the issue. A number of these factors, including the ratings of particular issues, are subject to change from time to time. Information about the financial condition of an issuer of

6

Municipal Bonds may not be as extensive as that which is made available by corporations whose securities are publicly traded.

Obligations of issuers of Municipal Bonds are subject to the provisions of bankruptcy, insolvency and other laws, such as the Federal Bankruptcy Reform Act of 1978, affecting the rights and remedies of creditors. Congress or state legislatures may seek to extend the time for payment of principal or interest, or both, or to impose other constraints upon enforcement of such obligations. There is also the possibility that as a result of litigation or other conditions, the power or ability of issuers to meet their obligations for the payment of interest and principal on their Municipal Bonds may be materially affected or their obligations may be found to be invalid or unenforceable. Such litigation or conditions may from time to time have the effect of introducing uncertainties in the market for Municipal Bonds or certain segments thereof, or of materially affecting the credit risk with respect to particular bonds. Adverse economic, business, legal or political developments might affect all or a substantial portion of the Fund's Municipal Bonds in the same manner. The Fund will be particularly subject to these risks to the extent that it focuses its investments in a particular state or region.

Residual Interest Municipal Bonds (RIBS)

The Fund may also invest up to 10% of its assets in residual interest Municipal Bonds ("RIBS") whose interest rates bear an inverse relationship to the interest rate on another security or the value of an index. RIBS are created by dividing the income stream provided by an underlying bond to create two securities, one short-term and one long-term. The interest rate on the short-term component is reset by an index or auction process normally every seven to 35 days. After income is paid on the short-term securities at current rates, the residual income goes to the long-term securities. Therefore, rising short-term interest rates result in lower income for the longer-term portion, and vice versa. The longer-term bonds can be very volatile and may be less liquid than other Municipal Bonds of comparable maturity. An investment in RIBS typically will involve greater risk than an investment in a fixed rate bond. Because changes in the interest rate on the other security or index inversely affect the residual interest paid on a RIB, the value of a RIB is generally more volatile than that of a fixed rate bond. RIBS have interest rate adjustment formulas which generally reduce or, in the extreme, eliminate the interest paid to the Fund when short-term interest rates rise, and increase the interest paid to the Fund when short-term interest rates fall. RIBS have varying degrees of liquidity, and the market for these securities is volatile. These securities generally will underperform the market for fixed rate bonds in a rising interest rate environment, but tend to outperform the market for fixed rate bonds when interest rates decline or remain relatively stable. Although volatile, RIBS typically offer the potential for yields exceeding the yields available on fixed rate bonds with comparable credit quality, coupon, call provisions and maturity. The Fund may also invest in RIBS for the purpose of increasing the Fund's leverage as a more flexible alternative to the issuance of Preferred Shares. Should short-term interest rates rise, the combination of the Fund's investment in RIBS and its use of other forms of leverage (including through the issuance of Preferred Shares or the use of other derivative instruments) likely will adversely affect the Fund's net asset value per share and income and distributions to

7

shareholders. Trusts in which RIBS may be held could be terminated, in which case the residual bond holder would take possession of the underlying bond on an unleveraged basis.

Short-Term Investments / Temporary Defensive Strategies

Upon PIMCO's recommendation, temporarily or for defensive purposes and in order to keep the Fund's cash fully invested, including the period during which the net proceeds of the offering are being invested, the Fund may invest up to 100% of its net assets in short-term investments including high quality, short- term securities that may be either tax-exempt or taxable. The Fund intends to invest in taxable short-term investments only in the event that suitable tax- exempt short-term investments are not available at reasonable prices and yields. To the extent the Fund invests in taxable short-term investments, the Fund will not at such times be in a position to achieve its investment objective of providing current income exempt from federal income tax.

Short-Term Taxable Fixed Income Securities

Short-term taxable fixed income investments are defined to include, without limitation, the following:

(1) U.S. government securities, including bills, notes and bonds differing as to maturity and rates of interest that are either issued or guaranteed by the U.S. Treasury or by U.S. government agencies or instrumentalities. U.S. government agency securities include securities issued by (a) the Federal Housing Administration, Farmers Home Administration, Export-Import Bank of the United States, Small Business Administration, and the Government National Mortgage Association, whose securities are supported by the full faith and credit of the United States;
(b) the Federal Home Loan Banks, Federal Intermediate Credit Banks, and the Tennessee Valley Authority, whose securities are supported by the right of the agency to borrow from the U.S. Treasury; (c) the Federal National Mortgage Association, whose securities are supported by the discretionary authority of the U.S. government to purchase certain obligations of the agency or instrumentality; and (d) the Student Loan Marketing Association, whose securities are supported only by its credit. While the U.S. government provides financial support to such U.S. government-sponsored agencies or instrumentalities, no assurance can be given that it always will do so since it is not so obligated by law. The U.S. government, its agencies, and instrumentalities do not guarantee the market value of their securities. Consequently, the value of such securities may fluctuate.

(2) Certificates of deposit issued against funds deposited in a bank or a savings and loan association. Such certificates are for a definite period of time, earn a specified rate of return, and are normally negotiable. The issuer of a certificate of deposit agrees to pay the amount deposited plus interest to the bearer of the certificate on the date specified thereon. Under current FDIC regulations, the maximum insurance payable as to any one certificate of deposit is $100,000; therefore, certificates of deposit purchased by the Fund may not be fully insured.

8

(3) Repurchase agreements, which involve purchases of debt securities. A repurchase agreement is a contractual agreement whereby the seller of securities (U.S. Government securities or Municipal Bonds) agrees to repurchase the same security at a specified price on a future date agreed upon by the parties. The agreed-upon repurchase price determines the yield during the Fund's holding period. Repurchase agreements are considered to be loans collateralized by the underlying security that is the subject of the repurchase contract. Income generated from transactions in repurchase agreements will be taxable. The Fund will only enter into repurchase agreements with registered securities dealers or domestic banks that PIMCO believes present minimal credit risk. The risk to the Fund is limited to the ability of the issuer to pay the agreed-upon repurchase price on the delivery date; however, although the value of the underlying collateral at the time the transaction is entered into always equals or exceeds the agreed-upon repurchase price, if the value of the collateral declines there is a risk of loss of both principal and interest. In the event of default, the collateral may be sold but the Fund might incur a loss if the value of the collateral declines, and might incur disposition costs or experience delays in connection with liquidating the collateral. In addition, if bankruptcy proceedings are commenced with respect to the seller of the security, realization upon the collateral by the Fund may be delayed or limited. PIMCO will monitor the value of the collateral at the time the transaction is entered into and at all times subsequent during the term of the repurchase agreement in an effort to determine that such value always equals or exceeds the agreed-upon repurchase price. In the event the value of the collateral declines below the repurchase price, PIMCO will demand additional collateral from the issuer to increase the value of the collateral to at least that of the repurchase price, including interest.

(4) Commercial paper, which consists of short-term unsecured promissory notes, including variable rate master demand notes issued by corporations to finance their current operations. Master demand notes are direct lending arrangements between the Fund and a corporation. There is no secondary market for such notes. However, they are redeemable by the Fund at any time. PIMCO will consider the financial condition of the corporation (e.g., earning power, cash flow, and other liquidity ratios) and will continuously monitor the corporation's ability to meet all of its financial obligations, because the Fund's liquidity might be impaired if the corporation were unable to pay principal and interest on demand. Investments in commercial paper will be limited to commercial paper rated in the highest categories by a major rating agency and which mature within one year of the date of purchase or carry a variable or floating rate of interest.

Short-Term Tax-Exempt Fixed Income Securities

Short-term tax-exempt fixed-income securities are securities that are exempt from regular federal income tax and mature within three years or less from the date of issuance. Short-term tax-exempt fixed income securities are defined to include, without limitation, the following:

Bond Anticipation Notes ("BANs") are usually general obligations of state and local governmental issuers which are sold to obtain interim financing for projects that will eventually be funded through the sale of long-term debt obligations or bonds. The ability of an issuer to

9

meet its obligations on its BANs is primarily dependent on the issuer's access to the long-term Municipal Bond market and the likelihood that the proceeds of such bond sales will be used to pay the principal and interest on the BANs.

Tax Anticipation Notes ("TANs") are issued by state and local governments to finance the current operations of such governments. Repayment is generally to be derived from specific future tax revenues. TANs are usually general obligations of the issuer. A weakness in an issuer's capacity to raise taxes due to, among other things, a decline in its tax base or a rise in delinquencies, could adversely affect the issuer's ability to meet its obligations on outstanding TANs.

Revenue Anticipation Notes ("RANs") are issued by governments or governmental bodies with the expectation that future revenues from a designated source will be used to repay the notes. In general, they also constitute general obligations of the issuer. A decline in the receipt of projected revenues, such as anticipated revenues from another level of government, could adversely affect an issuer's ability to meet its obligations on outstanding RANs. In addition, the possibility that the revenues would, when received, be used to meet other obligations could affect the ability of the issuer to pay the principal and interest on RANs.

Construction Loan Notes are issued to provide construction financing for specific projects. Frequently, these notes are redeemed with funds obtained from the Federal Housing Administration.

Bank Notes are notes issued by local government bodies and agencies, such as those described above to commercial banks as evidence of borrowings. The purposes for which the notes are issued are varied but they are frequently issued to meet short-term working capital or capital-project needs. These notes may have risks similar to the risks associated with TANs and RANs.

Tax-Exempt Commercial Paper ("Municipal Paper") represents very short-term unsecured, negotiable promissory notes issued by states, municipalities and their agencies. Payment of principal and interest on issues of Municipal Paper may be made from various sources, to the extent the funds are available therefrom. Maturities of Municipal Paper generally will be shorter than the maturities of TANs, BANs or RANs. There is a limited secondary market for issues of Municipal Paper.

Certain Municipal Bonds may carry variable or floating rates of interest whereby the rate of interest is not fixed but varies with changes in specified market rates or indices, such as a bank prime rate or a tax-exempt money market index.

While the various types of notes described above as a group represent the major portion of the tax-exempt note market, other types of notes are available in the marketplace and the Fund may invest in such other types of notes to the extent permitted under its investment objective, policies and limitations. Such notes may be issued for different purposes and may be secured differently from those mentioned above.

10

High Yield Securities ("Junk Bonds")

The Fund may invest up to 20% of its net assets in Municipal Bonds that, at the time of investment, are rated Ba/BB or B by Moody's, S&P or Fitch or unrated but judged to be of comparable quality by PIMCO. Bonds of below investment grade quality (Ba/BB or below) are commonly referred to as "high yield securities" or "junk bonds." Issuers of bonds rated Ba/BB or B are regarded as having current capacity to make principal and interest payments but are subject to business, financial or economic conditions which could adversely affect such payment capacity. Municipal bonds rated Baa or BBB are considered "investment grade" securities, although such bonds may be considered to possess some speculative characteristics. Municipal Bonds rated AAA in which the Fund may invest may have been so rated on the basis of the existence of insurance guaranteeing the timely payment, when due, of all principal and interest.

High yield securities are regarded as predominantly speculative with respect to the issuer's continuing ability to meet principal and interest payments and, therefore, carry greater price volatility and principal and income risk, including the possibility of issuer default and bankruptcy and increased market price volatility.

High yield securities may be more susceptible to real or perceived adverse economic and competitive industry conditions than investment grade securities. A projection of an economic downturn or of a period of rising interest rates, for example, could cause a decline in high yield security prices because the advent of a recession could lessen the ability of an issuer to make principal and interest payments on its debt securities. If an issuer of high yield securities defaults, in addition to risking payment of all or a portion of interest and principal, the Fund may incur additional expenses to seek recovery. In the case of high yield securities structured as zero-coupon or pay-in-kind securities, their market prices are affected to a greater extent by interest rate changes, and therefore tend to be more volatile than securities which pay interest periodically and in cash. PIMCO seeks to reduce these risks through diversification, credit analysis and attention to current developments and trends in both the economy and financial markets.

The secondary market on which high yield securities are traded may be less liquid than the market for higher grade securities. Less liquidity in the secondary trading market could adversely affect the price at which the Fund could sell a high yield security, and could adversely affect the daily net asset value of the shares. Adverse publicity and investor perceptions, whether or not based on fundamental analysis, may decrease the values and liquidity of high yield securities, especially in a thinly traded market. When secondary markets for high yield securities are less liquid than the market for higher grade securities, it may be more difficult to value the securities because such valuation may require more research, and elements of judgment may play a greater role in the valuation because there is less reliable, objective data available. During periods of thin trading in these markets, the spread between bid and asked prices is likely to increase significantly and the Fund may have greater difficulty selling its portfolio securities. The Fund will be more dependent on PIMCO's research and analysis when investing in high yield securities. PIMCO seeks to minimize the risks of investing in all securities through diversification, in-depth credit analysis and attention to current developments in interest rates and market conditions.

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A general description of Moody's, S&P's and Fitch's ratings of Municipal Bonds is set forth in Appendix A hereto. The ratings of Moody's, S&P and Fitch represent their opinions as to the quality of the Municipal Bonds they rate. It should be emphasized, however, that ratings are general and are not absolute standards of quality. Consequently, Municipal Bonds with the same maturity, coupon and rating may have different yields while obligations with the same maturity and coupon with different ratings may have the same yield. For these reasons, the use of credit ratings as the sole method of evaluating high yield securities can involve certain risks. For example, credit ratings evaluate the safety of principal and interest payments, not the market value risk of high yield securities. Also, credit rating agencies may fail to change credit ratings in a timely fashion to reflect events since the security was last rated. PIMCO does not rely solely on credit ratings when selecting securities for the Fund, and develops its own independent analysis of issuer credit quality.

The Fund's credit quality policies apply only at the time a security is purchased, and the Fund is not required to dispose of a security in the event that a rating agency or PIMCO downgrades its assessment of the credit characteristics of a particular issue. In determining whether to retain or sell such a security, PIMCO may consider such factors as PIMCO's assessment of the credit quality of the issuer of such security, the price at which such security could be sold and the rating, if any, assigned to such security by other rating agencies. However, analysis of the creditworthiness of issuers of high yield securities may be more complex than for issuers of higher quality debt securities.

Municipal Warrants

The Fund may invest in municipal warrants, which are essentially call options on Municipal Bonds. In exchange for a premium, they give the purchaser the right, but not the obligation, to purchase a Municipal Bond in the future. The Fund might purchase a warrant to lock in forward supply in an environment where the current issuance of bonds is sharply reduced. Like options, warrants may expire worthless and they may have reduced liquidity.

Variable and Floating Rate Securities

Variable and floating rate securities provide for a periodic adjustment in the interest rate paid on the obligations. The terms of such obligations must provide that interest rates are adjusted periodically based upon an interest rate adjustment index as provided in the respective obligations. The adjustment intervals may be regular, and range from daily up to annually, or may be event based, such as based on a change in the prime rate.

The Fund may invest in floating rate debt instruments ("floaters") and engage in credit spread trades. The interest rate on a floater is a variable rate which is tied to another interest rate, such as a municipal bond index or Treasury bill rate. The interest rate on a floater resets periodically, typically every six months. While, because of the interest rate reset feature, floaters provide the Fund with a certain degree of protection against rises in interest rates, the Fund will participate in any declines in interest rates as well. A credit spread trade is an investment position relating to a difference in the prices or interest rates of two bonds or other securities,

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where the value of the investment position is determined by movements in the difference between the prices or interest rates, as the case may be, of the respective securities or currencies.

Structured Notes and Other Hybrid Instruments

The Fund may invest in "structured" notes, which are privately negotiated debt obligations where the principal and/or interest is determined by reference to the performance of a benchmark asset or market, such as selected securities or an index of securities, or the differential performance of two assets or markets, such as indices reflecting taxable and tax-exempt bonds. Depending on the terms of the note, the Fund may forgo all or part of the interest and principal that would be payable on a comparable conventional note. The rate of return on structured notes may be determined by applying a multiplier to the performance or differential performance of the referenced index(es) or other asset(s). Application of a multiplier involves leverage which will serve to magnify the potential for gain and the risk of loss. The Fund currently intends that any use of structured notes will be for the purpose of reducing the interest rate sensitivity of the Fund's portfolio (and thereby decreasing the Fund's exposure to interest rate risk) and, in any event, that the interest income on the notes will be exempt from federal income tax. Like other sophisticated strategies, the Fund's use of structured notes may not work as intended; for example, by reducing the duration of the Fund's portfolio, structured notes may limit the Fund's return when having a longer duration would be beneficial (for instance, when interest rates decline).

The Fund may also invest in other "hybrid" instruments which combine the characteristics of securities, futures, and options. Hybrids can be used as an efficient means of pursuing a variety of investment goals, including duration management and increased total return. Hybrids may not bear interest or pay dividends. The value of a hybrid or its interest rate may be a multiple of a benchmark and, as a result, may be leveraged and move (up or down) more steeply and rapidly than the benchmark. These benchmarks may be sensitive to economic and political events that cannot be readily foreseen by the purchaser of a hybrid. Under certain conditions, the redemption value of a hybrid could be zero. Thus, an investment in a hybrid may entail significant market risks that are not associated with a similar investment in a traditional, U.S. dollar- denominated bond that has a fixed principal amount and pays a fixed rate or floating rate of interest. The purchase of hybrids also exposes the Fund to the credit risk of the issuer of the hybrids. These risks may cause significant fluctuations in the net asset value of the Fund.

Certain issuers of structured products such as hybrid instruments may be deemed to be investment companies as defined in the Investment Company Act of 1940 and the rules and regulations thereunder, as amended from time to time (the "1940 Act"). As a result, the Fund's investments in these products will be subject to limits applicable to investments in investment companies and may be subject to restrictions contained in the 1940 Act.

Borrowing

The Fund may borrow money to the extent permitted under the 1940 Act as interpreted, modified or otherwise permitted by regulatory authority having jurisdiction, from time to time. This means that, in general, the Fund may borrow money from banks for any purpose on a secured basis in an amount up to one-third of the Fund's total assets. The Fund

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may also borrow money for temporary administrative purposes on an unsecured basis to the extent permitted by law.

Specifically, provisions of the 1940 Act require the Fund to maintain continuous asset coverage (that is, total assets including borrowings, less liabilities exclusive of borrowings) of 300% of the amount borrowed, with an exception for borrowings not in excess of 5% of the Fund's total assets made for temporary administrative purposes. Any borrowings for temporary administrative purposes in excess of 5% of the Fund's total assets must maintain continuous asset coverage. If the 300% asset coverage should decline as a result of market fluctuations or other reasons, the Fund may be required to sell some of its portfolio holdings within three days to reduce the debt and restore the 300% asset coverage, even though it may be disadvantageous from an investment standpoint to sell securities at that time.

As noted below, the Fund also may enter into certain transactions, including reverse repurchase agreements, that can be viewed as constituting a form of borrowing or financing transaction by the Fund. To the extent the Fund covers its commitment under a reverse repurchase agreement (or economically similar transaction) by the segregation of assets determined to be liquid by PIMCO in accordance with procedures adopted by the Trustees, equal in value to the amount of the Fund's commitment to repurchase, such an agreement will not be considered a "senior security" by the Fund and therefore will not be subject to the 300% asset coverage requirement otherwise applicable to borrowings by the Fund. Borrowing will tend to exaggerate the effect on net asset value of any increase or decrease in the market value of the Fund's portfolio. Money borrowed will be subject to interest costs which may or may not be recovered by appreciation of the securities purchased. The Fund also may be required to maintain minimum average balances in connection with such borrowing or to pay a commitment or other fee to maintain a line of credit; either of these requirements would increase the cost of borrowing over the stated interest rate.

The Fund may enter into reverse repurchase agreements and economically similar transactions. A reverse repurchase agreement involves the sale of a portfolio-eligible security by the Fund, coupled with its agreement to repurchase the instrument at a specified time and price. Under a reverse repurchase agreement, the Fund continues to receive any principal and interest payments on the underlying security during the term of the agreement. The Fund typically will segregate assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, equal (on a daily mark-to- market basis) to its obligations under reverse repurchase agreements. However, reverse repurchase agreements involve the risk that the market value of securities retained by the Fund may decline below the repurchase price of the securities sold by the Fund which it is obligated to repurchase. To the extent that positions in reverse repurchase agreements are not covered through the segregation of liquid assets at least equal to the amount of any forward purchase commitment, such transactions would be subject to the Fund's limitations on borrowings, which would, among other things, restrict the aggregate of such transactions (plus any other borrowings) to one-third of the Fund's total assets.

The Fund also may effect simultaneous purchase and sale transactions that are known as "sale-buybacks." A sale-buyback is similar to a reverse repurchase agreement, except that in a sale-buyback, the counterparty who purchases the security is entitled to receive any principal or

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interest payments made on the underlying security pending settlement of the Fund's repurchase of the underlying security. The Fund's obligations under a sale-buyback typically would be offset by liquid assets equal in value to the amount of the Fund's forward commitment to repurchase the subject security.

Derivative Instruments

In pursuing its investment objective, the Fund may purchase and sell
(write) both put options and call options on securities, swap agreements, and securities indexes, and enter into interest rate and index futures contracts and purchase and sell options on such futures contracts ("futures options") for hedging purposes or as part of their overall investment strategies. The Fund also may enter into swap agreements with respect to interest rates and indexes of securities. If other types of financial instruments, including other types of options, futures contracts, or futures options are traded in the future, the Fund may also use those instruments, provided that the Trustees determine that their use is consistent with the Fund's investment objective.

The value of some derivative instruments in which the Fund may invest may be particularly sensitive to changes in prevailing interest rates, and, like the other investments of the Fund, the ability of the Fund to successfully utilize these instruments may depend in part upon the ability of PIMCO to forecast interest rates and other economic factors correctly. If PIMCO incorrectly forecasts such factors and has taken positions in derivative instruments contrary to prevailing market trends, the Fund could be exposed to the risk of loss.

The Fund might not employ any of the strategies described below, and no assurance can be given that any strategy used will succeed. If PIMCO incorrectly forecasts interest rates, market values or other economic factors in utilizing a derivatives strategy for the Fund, the Fund might have been in a better position if it had not entered into the transaction at all. Also, suitable derivative transactions may not be available in all circumstances. The use of these strategies involves certain special risks, including a possible imperfect correlation, or even no correlation, between price movements of derivative instruments and price movements of related investments. While some strategies involving derivative instruments can reduce the risk of loss, they can also reduce the opportunity for gain or even result in losses by offsetting favorable price movements in related investments or otherwise, due to the possible inability of the Fund to purchase or sell a portfolio security at a time that otherwise would be favorable or the possible need to sell a portfolio security at a disadvantageous time because the Fund is required to maintain asset coverage or offsetting positions in connection with transactions in derivative instruments, and the possible inability of the Fund to close out or to liquidate its derivatives positions. Income earned by the Fund from many derivative strategies will be treated as capital gain and, if not offset by net realized capital loss, will be distributed to shareholders in taxable distributions.

Options on Securities, Swap Agreements and Indexes. The Fund may purchase and sell both put and call options on Municipal Bonds or other securities, swap agreements or indexes in standardized contracts traded on domestic or other securities exchanges, boards of trade, or similar entities, or quoted on NASDAQ or on an over-the-counter market, and agreements, sometimes called cash puts, which may accompany the purchase of a new issue of bonds from a dealer.

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An option on a security (or index) is a contract that gives the holder of the option, in return for a premium, the right to buy from (in the case of a call) or sell to (in the case of a put) the writer of the option the security underlying the option (or the cash value of the index) at a specified exercise price at any time during the term of the option. The writer of an option on a security has the obligation upon exercise of the option to deliver the underlying security upon payment of the exercise price or to pay the exercise price upon delivery of the underlying security. Upon exercise, the writer of an option on an index is obligated to pay the difference between the cash value of the index and the exercise price multiplied by the specified multiplier for the index option. (An index is designed to reflect features of a particular Municipal Bond or other market, a specific group of financial instruments or securities, or certain economic indicators.)

The Fund will write call options and put options only if they are "covered." In the case of a call option on a Municipal Bond or other security, the option is "covered" if the Fund owns the security underlying the call or has an absolute and immediate right to acquire that security without additional cash consideration (or, if additional cash consideration is required, cash or other assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, in such amount are segregated by its custodian) upon conversion or exchange of other securities held by the Fund. For a call option on an index, the option is covered if the Fund maintains with its custodian assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, in an amount equal to the contract value of the index. A call option is also covered if the Fund holds a call on the same security or index as the call written where the exercise price of the call held is (i) equal to or less than the exercise price of the call written, or (ii) greater than the exercise price of the call written, provided the difference is maintained by the Fund in segregated assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees. A put option on a security or an index is "covered" if the Fund segregates assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees equal to the exercise price. A put option is also covered if the Fund holds a put on the same security or index as the put written where the exercise price of the put held is (i) equal to or greater than the exercise price of the put written, or (ii) less than the exercise price of the put written, provided the difference is maintained by the Fund in segregated assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees.

If an option written by the Fund expires unexercised, the Fund realizes a capital gain equal to the premium received at the time the option was written. If an option purchased by the Fund expires unexercised, the Fund realizes a capital loss equal to the premium paid. Prior to the earlier of exercise or expiration, an exchange traded option may be closed out by an offsetting purchase or sale of an option of the same series (type, exchange, underlying security or index, exercise price, and expiration). There can be no assurance, however, that a closing purchase or sale transaction can be effected when the Fund desires.

The Fund may sell put or call options it has previously purchased, which could result in a net gain or loss depending on whether the amount realized on the sale is more or less than the premium and other transaction costs paid on the put or call option which is sold. Prior to

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exercise or expiration, an option may be closed out by an offsetting purchase or sale of an option of the same series. The Fund will realize a capital gain from a closing purchase transaction if the cost of the closing option is less than the premium received from writing the option, or, if it is more, the Fund will realize a capital loss. If the premium received from a closing sale transaction is more than the premium paid to purchase the option, the Fund will realize a capital gain or, if it is less, the Fund will realize a capital loss. The principal factors affecting the market value of a put or a call option include supply and demand, interest rates, the current market price of the underlying security or index in relation to the exercise price of the option, the volatility of the underlying security or index, and the time remaining until the expiration date.

The premium paid for a put or call option purchased by the Fund is an asset of the Fund. The premium received for an option written by the Fund is recorded as a deferred credit. The value of an option purchased or written is marked to market daily and is valued at the closing price on the exchange on which it is traded or, if not traded on an exchange or no closing price is available, at the mean between the last bid and asked prices.

The Fund may write covered straddles consisting of a combination of a call and a put written on the same underlying security. A straddle will be covered when sufficient assets are deposited to meet the Fund's immediate obligations. The Fund may use the same liquid assets to cover both the call and put options where the exercise price of the call and put are the same, or the exercise price of the call is higher than that of the put. In such cases, the Fund will also segregate liquid assets equivalent to the amount, if any, by which the put is "in the money."

Risks Associated with Options on Securities and Indexes. There are several risks associated with transactions in options on securities and on indexes. For example, there are significant differences between the securities and options markets that could result in an imperfect correlation between these markets, causing a given transaction not to achieve its objectives. A decision as to whether, when and how to use options involves the exercise of skill and judgment, and even a well-conceived transaction may be unsuccessful to some degree because of market behavior or unexpected events.

During the option period, the covered call writer has, in return for the premium on the option, given up the opportunity to profit from a price increase in the underlying security above the exercise price, but, as long as its obligation as a writer continues, has retained the risk of loss should the price of the underlying security decline. The writer of an option has no control over the time when it may be required to fulfill its obligation as a writer of the option. Once an option writer has received an exercise notice, it cannot effect a closing purchase transaction in order to terminate its obligation under the option and must deliver the underlying security at the exercise price. If a put or call option purchased by the Fund is not sold when it has remaining value, and if the market price of the underlying security remains equal to or greater than the exercise price (in the case of a put), or remains less than or equal to the exercise price (in the case of a call), the Fund will lose its entire investment in the option. Also, where a put or call option on a particular security is purchased to hedge against price movements in a related security, the price of the put or call option may move more or less than the price of the related security.

There can be no assurance that a liquid market will exist when the Fund seeks to close

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out an option position. If the Fund were unable to close out an option that it had purchased on a security, it would have to exercise the option in order to realize any profit or the option may expire worthless. If the Fund were unable to close out a covered call option that it had written on a security, it would not be able to sell the underlying security unless the option expired without exercise. As the writer of a covered call option, the Fund forgoes, during the option's life, the opportunity to profit from increases in the market value of the security covering the call option above the sum of the premium and the exercise price of the call.

If trading were suspended in an option purchased by the Fund, the Fund would not be able to close out the option. If restrictions on exercise were imposed, the Fund might be unable to exercise an option it has purchased. Except to the extent that a call option on an index written by the Fund is covered by an option on the same index purchased by the Fund, movements in the index may result in a loss to the Fund; however, such losses may be mitigated by changes in the value of the Fund's securities during the period the option was outstanding.

Futures Contracts and Options on Futures Contracts. The Fund may invest in interest rate futures contracts and options thereon ("futures options"). The Fund may also purchase and sell futures contracts on Municipal Bonds and U.S. government securities, as well as purchase put and call options on such futures contracts.

An interest rate or index futures contract provides for the future sale by one party and purchase by another party of a specified quantity of a Municipal Bond or other financial instrument or the cash value of an index at a specified price and time. A futures contract on a Municipal Bond or other index is an agreement pursuant to which two parties agree to take or make delivery of an amount of cash equal to the difference between the value of the index at the close of the last trading day of the contract and the price at which the index contract was originally written. Although the value of an index might be a function of the value of certain specified securities, no physical delivery of these securities is made. A public market exists in futures contracts covering a number of indexes as well as financial instruments, including: certain Municipal Bonds; U.S. Treasury bonds; U.S. Treasury notes; three-month U.S. Treasury bills; 90-day commercial paper; and bank certificates of deposit. It is expected that other futures contracts will be developed and traded in the future.

The Fund may purchase and write call and put futures options. Futures options possess many of the same characteristics as options on securities and indexes (discussed above). A futures option gives the holder the right, in return for the premium paid, to assume a long position (call) or short position
(put) in a futures contract at a specified exercise price at any time during the period of the option. Upon exercise of a call option, the holder acquires a long position in the futures contract and the writer is assigned the opposite short position. In the case of a put option, the opposite is true.

To comply with applicable rules of the Commodity Futures Trading Commission ("CFTC") under which the Fund avoids being deemed a "commodity pool" or a "commodity pool operator," the Fund intends generally to limit its use of futures contracts and futures options to "bona fide hedging" transactions, as such term is defined in applicable regulations, interpretations and practice. For example, the Fund might use futures contracts to hedge against

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anticipated changes in interest rates that might adversely affect either the value of the Fund's Municipal Bonds or the price of the bonds which the Fund intends to purchase. The Fund's hedging activities may include sales of futures contracts as an offset against the effect of expected increases in interest rates, and purchases of futures contracts as an offset against the effect of expected declines in interest rates. Although other techniques could be used to reduce the Fund's exposure to interest rate fluctuations, the Fund may be able to hedge its exposure more effectively and perhaps at a lower cost by using futures contracts and futures options.

The Fund will only enter into futures contracts and futures options which are standardized and traded on a U.S. or other exchange, board of trade, or similar entity, or quoted on an automated quotation system.

When a purchase or sale of a futures contract is made by the Fund, the Fund is required to deposit with its custodian (or broker, if legally permitted) a specified amount of assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees ("initial margin"). The margin required for a futures contract is set by the exchange on which the contract is traded and may be modified during the term of the contract. The initial margin is in the nature of a performance bond or good faith deposit on the futures contract which is returned to the Fund upon termination of the contract, assuming all contractual obligations have been satisfied. The Fund expects to earn taxable interest income on its initial margin deposits. A futures contract held by the Fund is valued daily at the official settlement price of the exchange on which it is traded. Each day the Fund pays or receives cash, called "variation margin," equal to the daily change in value of the futures contract. This process is known as "marking to market." Variation margin does not represent a borrowing or loan by the Fund but is instead a settlement between the Fund and the broker of the amount one would owe the other if the futures contract expired. In computing daily net asset value, each Fund will mark to market its open futures positions.

The Fund is also required to deposit and maintain margin with respect to put and call options on futures contracts written by it. Such margin deposits will vary depending on the nature of the underlying futures contract (and the related initial margin requirements), the current market value of the option, and other futures positions held by the Fund.

Although some futures contracts call for making or taking delivery of the underlying securities, generally these obligations are closed out prior to delivery by offsetting purchases or sales of matching futures contracts (involving the same exchange, underlying security or index, and delivery month). If an offsetting purchase price is less than the original sale price, the Fund realizes a capital gain, or if it is more, the Fund realizes a capital loss. Conversely, if an offsetting sale price is more than the original purchase price, the Fund realizes a capital gain, or if it is less, the Fund realizes a capital loss. The transaction costs must also be included in these calculations.

The Fund may write covered straddles consisting of a call and a put written on the same underlying futures contract. A straddle will be covered when sufficient assets are deposited to meet the Fund's immediate obligations. The Fund may use the same liquid assets to cover both the call and put options where the exercise price of the call and put are the same, or the exercise

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price of the call is higher than that of the put. In such cases, the Fund will also segregate liquid assets equivalent to the amount, if any, by which the put is "in the money."

Limitations on Use of Futures and Futures Options. As noted above, the Fund generally intends to enter into positions in futures contracts and related options only for "bona fide hedging" purposes. With respect to positions in futures and related options that do not constitute bona fide hedging positions, the Fund will not enter into a futures contract or futures option contract if, immediately thereafter, the aggregate initial margin deposits relating to such positions plus premiums paid by it for open futures option positions, less the amount by which any such options are "in-the-money," would exceed 5% of the Fund's net assets. A call option is "in-the-money" if the value of the futures contract that is the subject of the option exceeds the exercise price. A put option is "in-the-money" if the exercise price exceeds the value of the futures contract that is the subject of the option.

When purchasing a futures contract, the Fund will maintain with its custodian (and mark-to-market on a daily basis) assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, that, when added to the amounts deposited with a futures commission merchant as margin, are equal to the market value of the futures contract. Alternatively, the Fund may "cover" its position by purchasing a put option on the same futures contract with a strike price as high or higher than the price of the contract held by the Fund.

When selling a futures contract, the Fund will maintain with its custodian (and mark-to-market on a daily basis) assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, that are equal to the market value of the instruments underlying the contract. Alternatively, the Fund may "cover" its position by owning the instruments underlying the contract (or, in the case of an index futures contract, a portfolio with a volatility substantially similar to that of the index on which the futures contract is based), or by holding a call option permitting the Fund to purchase the same futures contract at a price no higher than the price of the contract written by the Fund (or at a higher price if the difference is maintained in liquid assets with the Trust's custodian).

When selling a call option on a futures contract, the Fund will maintain with its custodian (and mark-to-market on a daily basis) assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, that, when added to the amounts deposited with a futures commission merchant as margin, equal the total market value of the futures contract underlying the call option. Alternatively, the Fund may cover its position by entering into a long position in the same futures contract at a price no higher than the strike price of the call option, by owning the instruments underlying the futures contract, or by holding a separate call option permitting the Fund to purchase the same futures contract at a price not higher than the strike price of the call option sold by the Fund.

When selling a put option on a futures contract, the Fund will maintain with its custodian (and mark-to-market on a daily basis) assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, that equal the purchase price of the futures contract, less any margin on deposit. Alternatively, the Fund may cover the position either by entering into a short position in the same futures contract, or by owning a separate put option

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permitting it to sell the same futures contract so long as the strike price of the purchased put option is the same or higher than the strike price of the put option sold by the Fund.

To the extent that securities with maturities greater than one year are used to segregate assets to cover the Fund's obligations under futures contracts and related options, such use will not eliminate the risk of a form of leverage, which may tend to exaggerate the effect on net asset value of any increase or decrease in the market value of the Fund's portfolio, and may require liquidation of portfolio positions when it is not advantageous to do so.

Risks Associated with Futures and Futures Options. There are several risks associated with the use of futures contracts and futures options as hedging techniques. A purchase or sale of a futures contract may result in losses in excess of the amount invested in the futures contract. There can be no guarantee that there will be a correlation between price movements in the hedging vehicle and in the Fund securities being hedged. In addition, there are significant differences between the securities and futures markets that could result in an imperfect correlation between the markets, causing a given hedge not to achieve its objectives. The degree of imperfection of correlation depends on circumstances such as variations in speculative market demand for futures and futures options on securities, including technical influences in futures trading and futures options, and differences between the financial instruments being hedged and the instruments underlying the standard contracts available for trading in such respects as interest rate levels, maturities, and creditworthiness of issuers. A decision as to whether, when and how to hedge involves the exercise of skill and judgment, and even a well-conceived hedge may be unsuccessful to some degree because of market behavior or unexpected interest rate trends.

Futures contracts on U.S. Government securities historically have reacted to an increase or decrease in interest rates in a manner similar to that in which the underlying U.S. Government securities reacted. To the extent, however, that the Fund enters into such futures contracts, the value of such futures will not vary in direct proportion to the value of the Fund's holdings of Municipal Bonds. Thus, the anticipated spread between the price of the futures contract and the hedged security may be distorted due to differences in the nature of the markets. The spread also may be distorted by differences in initial and variation margin requirements, the liquidity of such markets and the participation of speculators in such markets.

Futures exchanges may limit the amount of fluctuation permitted in certain futures contract prices during a single trading day. The daily limit establishes the maximum amount that the price of a futures contract may vary either up or down from the previous day's settlement price at the end of the current trading session. Once the daily limit has been reached in a futures contract subject to the limit, no more trades may be made on that day at a price beyond that limit. The daily limit governs only price movements during a particular trading day and therefore does not limit potential losses because the limit may work to prevent the liquidation of unfavorable positions. For example, futures prices have occasionally moved to the daily limit for several consecutive trading days with little or no trading, thereby preventing prompt liquidation of positions and subjecting some holders of futures contracts to substantial losses.

There can be no assurance that a liquid market will exist at a time when the Fund seeks to close out a futures or a futures option position, and the Fund would remain obligated to meet

21

margin requirements until the position is closed. In addition, many of the contracts discussed above are relatively new instruments without a significant trading history. As a result, there can be no assurance that an active secondary market will develop or continue to exist.

Swap Agreements. The Fund may enter into interest rate, index, and credit swap agreements. The Fund may also enter into options on swap agreements ("swap options"). These transactions are entered into in an attempt to obtain a particular return when it is considered desirable to do so, possibly at a lower cost to the Fund than if the Fund had invested directly in an instrument that yielded that desired return. Swap agreements are two-party contracts entered into primarily by institutional investors for periods ranging from a few weeks to more than one year. In a standard "swap" transaction, two parties agree to exchange the returns (or differentials in rates of return) earned or realized on particular predetermined investments or instruments, which may be adjusted for an interest factor. The gross returns to be exchanged or "swapped" between the parties are generally calculated with respect to a "notional amount," i.e., the return on or increase in value of a particular dollar amount invested at a particular interest rate or in a "basket" of securities representing a particular index. Forms of swap agreements include interest rate caps, under which, in return for a premium, one party agrees to make payments to the other to the extent that interest rates exceed a specified rate, or "cap"; interest rate floors, under which, in return for a premium, one party agrees to make payments to the other to the extent that interest rates fall below a specified rate, or "floor"; and interest rate collars, under which a party sells a cap and purchases a floor or vice versa in an attempt to protect itself against interest rate movements exceeding given minimum or maximum levels. A swap option is a contract that gives a counterparty the right (but not the obligation) to enter into a new swap agreement or to shorten, extend, cancel or otherwise modify an existing swap agreement, at some designated future time on specified terms. The Fund may write (sell) and purchase put and call swap options.

Most swap agreements entered into by the Fund would calculate the obligations of the parties to the agreement on a "net basis." Consequently, the Fund's current obligations (or rights) under a swap agreement will generally be equal only to the net amount to be paid or received under the agreement based on the relative values of the positions held by each party to the agreement (the "net amount"). The Fund's current obligations under a swap agreement will be accrued daily (offset against any amounts owed to the Fund) and any accrued but unpaid net amounts owed to a swap counterparty will be covered by the segregation of assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, to avoid any potential leveraging of the Fund's portfolio. Obligations under swap agreements so covered will not be construed to be "senior securities" for purposes of the Fund's investment restriction concerning senior securities. The Fund will not enter into a swap agreement with any single party if the net amount owed or to be received under existing contracts with that party would exceed 5% of the Fund's assets.

Whether the Fund's use of swap agreements or swap options will be successful in furthering its investment objective will depend on PIMCO's ability to predict correctly whether certain types of investments are likely to produce greater returns than other investments. Because they are two-party contracts and because they may have terms of greater than seven days, swap agreements may be considered to be illiquid. Moreover, the Fund bears the risk of

22

loss of the amount expected to be received under a swap agreement in the event of the default or bankruptcy of a swap agreement counterparty. The Fund will enter into swap agreements only with counterparties that meet certain standards of creditworthiness (generally, such counterparties would have to be eligible counterparties under the terms of the Fund's repurchase agreement guidelines). The swaps market is a relatively new market and is largely unregulated. It is possible that developments in the swaps market, including potential government regulation, could adversely affect the Fund's ability to terminate existing swap agreements or to realize amounts to be received under such agreements.

Depending on the terms of the particular option agreement, the Fund will generally incur a greater degree of risk when it writes a swap option than it will incur when it purchases a swap option. When the Fund purchases a swap option, it risks losing only the amount of the premium it has paid should it decide to let the option expire unexercised. However, when the Fund writes a swap option, upon exercise of the option the Fund will become obligated according to the terms of the underlying agreement.

Certain swap agreements are exempt from most provisions of the Commodity Exchange Act ("CEA") and, therefore, are not regulated as futures or commodity option transactions under the CEA, pursuant to regulations approved by the CFTC effective February 22, 1993. To qualify for this exemption, a swap agreement must be entered into by "eligible participants," which includes the following, provided the participants' total assets exceed established levels: a bank or trust company, savings association or credit union, insurance company, investment company subject to regulation under the 1940 Act, commodity pool, corporation, partnership, proprietorship, organization, trust or other entity, employee benefit plan, governmental entity, broker-dealer, futures commission merchant, natural person, or regulated foreign person. To be eligible, natural persons and most other entities must have total assets exceeding $10 million; commodity pools and employee benefit plans must have assets exceeding $5 million. In addition, an eligible swap transaction must meet three conditions. First, the swap agreement may not be part of a fungible class of agreements that are standardized as to their material economic terms. Second, the creditworthiness of parties with actual or potential obligations under the swap agreement must be a material consideration in entering into or determining the terms of the swap agreement, including pricing, cost or credit enhancement terms. Third, swap agreements may not be entered into and traded on or through a multilateral transaction execution facility. Swap agreements are likely to generate capital gains income which would in turn be distributed to shareholders.

This exemption is not exclusive, and participants may continue to rely on existing exclusions for swaps, such as the Policy Statement issued in July 1989 which recognized a safe harbor for swap transactions from regulation as futures or commodity option transactions under the CEA or its regulations. The Policy Statement applies to swap transactions settled in cash that (1) have individually tailored terms, (2) lack exchange-style offset and the use of a clearing organization or margin system, (3) are undertaken in conjunction with a line of business, and (4) are not marketed to the public.

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Short Sales

The Fund may make short sales of securities as part of its overall portfolio management strategy involving the use of derivative instruments and to offset potential declines in long positions in securities in the Fund's portfolio. A short sale is a transaction in which the Fund sells a security it does not own in anticipation that the market price of that security will decline. Although short sale transactions are not currently available with respect to Municipal Bonds, the Fund may engage in short sales on taxable bonds and on futures contracts with respect to Municipal Bonds and taxable bonds.

When the Fund makes a short sale on a security, it must borrow the security sold short and deliver it to the broker-dealer through which it made the short sale as collateral for its obligation to deliver the security upon conclusion of the sale. The Fund may have to pay a fee to borrow particular securities and is often obligated to pay over any accrued interest and dividends on such borrowed securities.

If the price of the security sold short increases between the time of the short sale and the time the Fund replaces the borrowed security, the Fund will incur a loss; conversely, if the price declines, the Fund will realize a capital gain. Any gain will be decreased, and any loss increased, by the transaction costs described above. The successful use of short selling may be adversely affected by imperfect correlation between movements in the price of the security sold short and the securities being hedged.

To the extent that the Fund engages in short sales, it will provide collateral to the broker-dealer and (except in the case of short sales "against the box") will maintain additional asset coverage in the form of segregated assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees. The Fund does not intend to enter into short sales (other than those "against the box") if immediately after such sale the aggregate of the value of all collateral plus the amount of the segregated assets exceeds one-third of the value of the Fund's net assets. This percentage may be varied by action of the Trustees. A short sale is "against the box" to the extent that the Fund contemporaneously owns, or has the right to obtain at no added cost, securities identical to those sold short. The Fund will engage in short selling to the extent permitted by the 1940 Act and rules and interpretations thereunder.

Illiquid Securities

The Fund may invest up to 15% of its net assets in illiquid securities. The term "illiquid securities" for this purpose means securities that cannot be disposed of within seven days in the ordinary course of business at approximately the amount at which the Fund has valued the securities. Illiquid securities are considered to include, among other things, written over-the- counter options, securities or other liquid assets being used as cover for such options, repurchase agreements with maturities in excess of seven days, certain loan participation interests, fixed time deposits which are not subject to prepayment or provide for withdrawal penalties upon prepayment (other than overnight deposits), and other securities whose disposition is restricted under the federal securities laws (other than securities issued pursuant to Rule 144A under the 1933 Act and certain commercial paper that PIMCO has determined to be liquid under procedures approved by the Board of Trustees).

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Illiquid securities may include privately placed securities, which are sold directly to a small number of investors, usually institutions. Unlike public offerings, such securities are not registered under the federal securities laws. Although certain of these securities may be readily sold, others may be illiquid, and their sale may involve substantial delays and additional costs.

Portfolio Trading and Turnover Rate

Portfolio trading may be undertaken to accomplish the investment objective of the Fund in relation to actual and anticipated movements in interest rates. In addition, a security may be sold and another of comparable quality purchased at approximately the same time to take advantage of what PIMCO believes to be a temporary price disparity between the two securities. Temporary price disparities between two comparable securities may result from supply and demand imbalances where, for example, a temporary oversupply of certain bonds may cause a temporarily low price for such bonds, as compared with other bonds of like quality and characteristics. The Fund may also engage to a limited extent in short-term trading consistent with its investment objective. Securities may be sold in anticipation of a market decline (a rise in interest rates) or purchased in anticipation of a market rise (a decline in interest rates) and later sold, or to recognize a gain.

A change in the securities held by the Fund is known as "portfolio turnover." PIMCO manages the Fund without regard generally to restrictions on portfolio turnover. The use of certain derivative instruments with relatively short maturities may tend to exaggerate the portfolio turnover rate for the Fund. Trading in fixed income securities does not generally involve the payment of brokerage commissions, but does involve indirect transaction costs. The use of futures contracts may involve the payment of commissions to futures commission merchants. High portfolio turnover (e.g., greater than 100%) involves correspondingly greater expenses to the Fund, including brokerage commissions or dealer mark-ups and other transaction costs on the sale of securities and reinvestments in other securities. The higher the rate of portfolio turnover of the Fund, the higher these transaction costs borne by the Fund generally will be. Transactions in the Fund's portfolio securities may result in realization of taxable capital gains (including short-term capital gains which are generally taxed to shareholders at ordinary income tax rates). The trading costs and tax effects associated with portfolio turnover may adversely affect the Fund's performance.

The portfolio turnover rate of the Fund is calculated by dividing (a) the lesser of purchases or sales of portfolio securities for the particular fiscal year by (b) the monthly average of the value of the portfolio securities owned by the Fund during the particular fiscal year. In calculating the rate of portfolio turnover, there is excluded from both (a) and (b) all securities, including options, whose maturities or expiration dates at the time of acquisition were one year or less.

Other Investment Companies

The Fund may invest in securities of other open- or closed-end investment companies that invest primarily in Municipal Bonds of the types in which the Fund may invest directly. The Fund may invest in other investment companies either during periods when it has large amounts

25

of uninvested cash, such as the period shortly after the Fund receives the proceeds of the offering of its Common Shares or Preferred Shares, during periods when there is a shortage of attractive, high-yielding Municipal Bonds available in the market, or when PIMCO believes share prices of other investment companies offer attractive values. The Fund may invest in investment companies that are advised by PIMCO or its affiliates to the extent permitted by applicable law and/or pursuant to exemptive relief from the SEC. As a stockholder in an investment company, the Fund will bear its ratable share of that investment company's expenses and would remain subject to payment of the Fund's management fees with respect to assets so invested. Holders of Common Shares ("Common Shareholders") would therefore be subject to duplicative expenses to the extent the Fund invests in other investment companies. PIMCO will take expenses into account when evaluating the investment merits of an investment in an investment company relative to available Municipal Bond investments. In addition, the securities of other investment companies may also be leveraged and will therefore be subject to the same leverage risks described herein. As described in the Fund's Prospectus in the section entitled "Risks," the net asset value and market value of leveraged shares will be more volatile and the yield to shareholders will tend to fluctuate more than the yield generated by unleveraged shares.

When-Issued, Delayed Delivery and Forward Commitment Transactions

The Fund may purchase or sell securities on a when-issued, delayed delivery, or forward commitment basis. When such purchases are outstanding, the Fund will segregate until the settlement date assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees, in an amount sufficient to meet the purchase price. Typically, no income accrues on securities the Fund has committed to purchase prior to the time delivery of the securities is made, although the Fund may earn income on securities it has segregated.

When purchasing a security on a when-issued, delayed delivery, or forward commitment basis, the Fund assumes the rights and risks of ownership of the security, including the risk of price and yield fluctuations, and takes such fluctuations into account when determining its net asset value. Because the Fund is not required to pay for the security until the delivery date, these risks are in addition to the risks associated with the Fund's other investments. If the Fund remains substantially fully invested at a time when when-issued, delayed delivery, or forward commitment purchases are outstanding, the purchases may result in a form of leverage.

When the Fund has sold a security on a when-issued, delayed delivery, or forward commitment basis, the Fund does not participate in future gains or losses with respect to the security. If the other party to a transaction fails to deliver or pay for the securities, the Fund could miss a favorable price or yield opportunity or could suffer a loss. The Fund may dispose of or renegotiate a transaction after it is entered into, and may sell when-issued, delayed delivery or forward commitment securities before they are delivered, which may result in a capital gain or loss. There is no percentage limitation on the extent to which the Fund may purchase or sell securities on a when-issued, delayed delivery, or forward commitment basis.

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Zero Coupon Bonds

The Fund may invest in zero coupon bonds. A zero coupon bond is a bond that does not pay interest for its entire life. The market prices of zero coupon bonds are affected to a greater extent by changes in prevailing levels of interest rates and thereby tend to be more volatile in price than securities that pay interest periodically. In addition, because the Fund accrues income with respect to these securities prior to the receipt of such interest, it may have to dispose of portfolio securities under disadvantageous circumstances in order to obtain cash needed to pay income dividends in amounts necessary to avoid unfavorable tax consequences.

INVESTMENT RESTRICTIONS

Fundamental Investment Restrictions

Except as described below, the Fund, as a fundamental policy, may not, without the approval of the holders of a majority of the outstanding Common Shares and, if issued, Preferred Shares voting together as a single class, and of the holders of a majority of the outstanding Preferred Shares voting as a separate class:

(1) Concentrate its investments in a particular industry, as that term is used in the Investment Company Act of 1940, as amended, and as interpreted, modified, or otherwise permitted by regulatory authority having jurisdiction, from time to time.

(2) With respect to 75% of the Fund's total assets, purchase the securities of any issuer, except securities issued or guaranteed by the U.S. government or any of its agencies or instrumentalities or securities issued by other investment companies, if, as a result, (i) more than 5% of the Fund's total assets would be invested in the securities of that issuer, or (ii) the Fund would hold more than 10% of the outstanding voting securities of that issuer. For the purpose of this restriction, each state and each separate political subdivision, agency, authority or instrumentality of such state, each multi-state agency or authority, and each guarantor, if any, are treated as separate issuers of Municipal Bonds.

(3) Purchase or sell real estate, although it may purchase securities (including Municipal Bonds) secured by real estate or interests therein, or securities issued by companies which invest in real estate, or interests therein.

(4) Purchase or sell commodities or commodities contracts or oil, gas or mineral programs. This restriction shall not prohibit the Fund, subject to restrictions described in the Prospectus and elsewhere in this Statement of Additional Information, from purchasing, selling or entering into futures contracts, options on futures contracts, forward contracts, or any interest rate, securities-related or other hedging instrument, including swap agreements and other derivative instruments, subject to compliance with any applicable provisions of the federal securities or commodities laws.

(5) Borrow money or issue any senior security, except to the extent permitted

27

under the Investment Company Act of 1940, as amended, and as interpreted, modified, or otherwise permitted by regulatory authority having jurisdiction, from time to time.

(6) Make loans, except to the extent permitted under the Investment Company Act of 1940, as amended, and as interpreted, modified, or otherwise permitted by regulatory authority having jurisdiction, from time to time.

(7) Act as an underwriter of securities of other issuers, except to the extent that in connection with the disposition of portfolio securities, it may be deemed to be an underwriter under the federal securities laws.

For purposes of the foregoing and "Description of Shares--Preferred Shares--Voting Rights" below, "majority of the outstanding," when used with respect to particular shares of the Fund (whether voting together as a single class or voting as a separate class), means (i) 67% or more of such shares present at a meeting, if the holders of more than 50% of such shares are present or represented by proxy, or (ii) more than 50% of such shares, whichever is less.

Unless otherwise indicated, all limitations applicable to the Fund's investments (as stated above and elsewhere in this Statement of Additional Information) apply only at the time a transaction is entered into. Any subsequent change in a rating assigned by any rating service to a security (or, if unrated, deemed by PIMCO to be of comparable quality), or change in the percentage of the Fund's assets invested in certain securities or other instruments, or change in the average maturity or duration of the Fund's investment portfolio, resulting from market fluctuations or other changes in the Fund's total assets, will not require the Fund to dispose of an investment until PIMCO determines that it is practicable to sell or close out the investment without undue market or tax consequences to the Fund. In the event that ratings services assign different ratings to the same security, PIMCO will determine which rating it believes best reflects the security's quality and risk at that time, which may be the higher of the several assigned ratings.

Under the 1940 Act, a "senior security" does not include any promissory note or evidence of indebtedness where such loan is for temporary purposes only and in an amount not exceeding 5% of the value of the total assets of the issuer at the time the loan is made. A loan is presumed to be for temporary purposes if it is repaid within sixty days and is not extended or renewed.

The Fund's industry concentration policy does not preclude it from focusing investments in issuers in a group of related industries (such as different types of utilities).

To the extent the Fund covers its commitment under a reverse repurchase agreement (or economically similar transaction) by the segregation of assets determined by PIMCO to be liquid in accordance with procedures adopted by the Trustees, equal in value to the amount of the Fund's commitment to repurchase, such an agreement will not be considered a "senior security" by the Fund and therefore will not be subject to the 300% asset coverage requirement otherwise applicable to borrowings by the Fund.

The staff of the SEC has taken the position that purchased over-the-counter ("OTC") options and the assets used as cover for written OTC options are illiquid securities. Therefore, the Fund has adopted an investment policy pursuant to which it will not purchase or sell OTC options if, as a result of such transactions, the sum of: 1) the market value of OTC options currently outstanding which are held by the Fund, 2) the market value of the underlying

28

securities covered by OTC call options currently outstanding which were sold by the Fund and 3) margin deposits on the Fund's existing OTC options on futures contracts, exceeds 15% of the net assets of the Fund, taken at market value, together with all other assets of the Fund which are illiquid or are otherwise not readily marketable. However, if an OTC option is sold by the Fund to a primary U.S. Government securities dealer recognized by the Federal Reserve Bank of New York and if the Fund has the unconditional contractual right to repurchase such OTC option from the dealer at a predetermined price, then the Fund will treat as illiquid such amount of the underlying securities equal to the repurchase price less the amount by which the option is "in-the-money" (i.e., current market value of the underlying securities minus the option's strike price). The repurchase price with the primary dealers is typically a formula price which is generally based on a multiple of the premium received for the option, plus the amount by which the option is "in-the-money." This policy is not a fundamental policy of the Fund and may be amended by the Trustees without the approval of shareholders. However, the Fund will not change or modify this policy prior to the change or modification by the SEC staff of its position.

The Fund interprets its policies with respect to borrowing and lending to permit such activities as may be lawful for the Fund, to the full extent permitted by the 1940 Act or by exemption from the provisions therefrom pursuant to exemptive order of the SEC.

The Fund intends to apply for ratings for its Preferred Shares from Moody's and/or S&P. In order to obtain and maintain the required ratings, the Fund may be required to comply with investment quality, diversification and other guidelines established by Moody's or S&P. Such guidelines will likely be more restrictive than the restrictions set forth above. The Fund does not anticipate that such guidelines would have a material adverse effect on its Common Shareholders or its ability to achieve its investment objective. The Fund presently anticipates that any Preferred Shares that it intends to issue would be initially given the highest ratings by Moody's ("Aaa") or by S&P ("AAA"), but no assurance can be given that such ratings will be obtained. No minimum rating is required for the issuance of Preferred Shares by the Fund. Moody's and S&P receive fees in connection with their ratings issuances.

MANAGEMENT OF THE FUND

Trustees and Officers

The business of the Fund is managed under the direction of the Fund's Board of Trustees. Subject to the provisions of the Fund's Agreement and Declaration of Trust (the "Declaration"), its By-Laws and Massachusetts law, the Trustees have all powers necessary and convenient to carry out this responsibility, including the election and removal of the Fund's officers.

The Trustees and officers of the Fund, their ages, and a description of their principal occupations during the past five years are listed below. Except as shown, each Trustee's and officer's principal occupation and business experience for the last five years have been with the employer(s) indicated, although in some cases the Trustee or officer may have held different positions with such employer(s). Unless otherwise indicated, the business address of the persons listed below is c/o PIMCO Advisory Services, 1345 Avenue of the Americas, New York, New York 10105.

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                                 Position(s) With the        Principal Occupation(s) During the Past Five Years
Name, Address and Age            Fund
Stephen J. Treadway*             Chairman,                   Executive Vice President, PIMCO Advisors; Chairman and
2187 Atlantic Street             President, Trustee          Chief Executive Officer, PIMCO Funds Distributors LLC
Stamford, CT 06902                                           ("PFD"); Trustee, President and Chief Executive
Age 52                                                       Officer, PIMCO Funds: Multi-Manager Series; Chairman,
                                                             Fixed Income SHares; Trustee, Chairman and President,
                                                             OCC Cash Reserves, Inc., OCC Accumulation Trust, PIMCO
                                                             California Municipal Income Fund and PIMCO New York
                                                             Municipal Income Fund; Executive Vice President, Value
                                                             Advisors LLC; Chairman, Municipal Advantage Fund, Inc.;
                                                             President, The Emerging Markets Income Fund, Inc., The
                                                             Emerging Markets Income Fund II, Inc., The Emerging
                                                             Markets Floating Rate Fund, Inc., Global Partners
                                                             Income Fund, Inc., Municipal Partners Fund, Inc. and
                                                             Municipal Partners Fund II, Inc. Formerly, Trustee,
                                                             President and Chief Executive Officer of Cash
                                                             Accumulation Trust; Chairman, The Central European
                                                             Value Fund, Inc. Executive Vice President,
                                                             Smith Barney Inc.

Paul Belica                      Trustee                     Trustee, Fixed Income Shares, PIMCO California
Age 79                                                       Municipal Income Fund and PIMCO New York Municipal
                                                             Income Fund; Manager, Stratigos Fund, L.L.C., Whistler
                                                             Fund, L.L.C., Xanthus Fund, L.L.C. and Wynstone Fund,
                                                             L.L.C.; Director, Student Loan Finance Corporation,
                                                             Education Loans, Inc., Goal Funding, Inc. and Surety
                                                             Loan Funding Company; Former Advisor, Salomon Smith
                                                             Barney Inc.; Former Director, Central European Value
                                                             Fund, Inc., Deck House, Inc., a manufacturing company,
                                                             The Czech Republic Fund, Inc.; Director, Senior Vice
                                                             President and Managing Director, Smith Barney, Harris
                                                             Upham and Co.; Director and Treasurer, Isabela Home
                                                             Inc., Isabela Housing Company Inc., and Isabela Nursing
                                                             Home Inc.; Director, Dreyfus Tax Exempt Bond Fund,
                                                             Inc., Dreyfus New York State Tax Exempt Bond Fund,
                                                             Inc., and Union Dime Savings Bank; Executive Director,
                                                             New York State Housing Finance Agency, New York State
                                                             Medical Care Facilities Finance Agency, New York State
                                                             Municipal Bond Bank Agency, New York State Project
                                                             Finance Agency and Chairman, State of New York Mortgage
                                                             Agency; President, Paul Belica and Company, Inc., a
                                                             financial advisory business; Project Manager, Walsh
                                                             Construction Company; Member, Ministry of Foreign
                                                             Affairs of Czechoslovakia in Prague and Czechoslovak
                                                             Embassy in Vienna.

Robert E. Connor                 Vice President, Trustee     Trustee, Fixed Income Shares, PIMCO California
Age 66                                                       Municipal Income Fund and PIMCO New York Municipal
                                                             Income Fund; Director, Municipal Advantage Fund, Inc.;
                                                             Corporate Affairs Consultant; Formerly, Senior Vice
                                                             President, Corporate Office, Salomon Smith

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Barney Inc.

Newton B. Schott, Jr.     Secretary                   Executive Vice President,
2187 Atlantic Street                                  Chief Administrative
Stamford, CT 06902                                    Officer, Secretary and
Age 57                                                General Counsel, PFD;
                                                      Senior Vice President --
                                                      Mutual Fund Division,
                                                      PIMCO Advisors; Vice
                                                      President and Secretary,
                                                      PIMCO Funds: Multi-Manager
                                                      Series; Executive Vice
                                                      President and Secretary,
                                                      The Emerging Markets
                                                      Income Fund, Inc., The
                                                      Emerging Markets Income
                                                      Fund II, Inc., The
                                                      Emerging Markets Floating
                                                      Rate Fund, Inc., Global
                                                      Partners Income Fund,
                                                      Inc., Municipal Advantage
                                                      Fund, Inc., Municipal
                                                      Partners Fund, Inc. and
                                                      Municipal Partners Fund
                                                      II, Inc.; Secretary, Fixed
                                                      Income SHares. Formerly,
                                                      Vice President and Clerk,
                                                      PIMCO Advisors Funds and
                                                      Cash Accumulation Trust.


Brian S. Shlissel         Treasurer; Principal        Vice President, PIMCO
Age 36                    Financial and Accounting    Advisors; Executive Vice
                          Officer                     President and Treasurer,
                                                      OCC Cash Reserves, Inc.
                                                      and OCC Accumulation
                                                      Trust; President, Chief
                                                      Executive Officer and
                                                      Treasurer, Fixed Income
                                                      SHares; Treasurer,
                                                      Municipal Advantage Fund
                                                      Inc. Formerly, Vice
                                                      President, Mitchell
                                                      Hutchins Asset Management
                                                      Inc.


Mark V. McCray            Vice President              Executive Vice President,
840 Newport Center Drive                              PIMCO. Formerly, Vice
Newport Beach, CA  92660                              President and co-head of
Age 34                                                municipal bond trading,
                                                      Goldman Sachs & Co.



Michael B. Zuckerman      Assistant Secretary         Vice President, PIMCO
Age 36                                                Advisors L.P.; Secretary,
                                                      OCC Accumulation Trust and
                                                      OCC Cash Reserves, Inc.
                                                      Formerly, Associate,
                                                      Dechert Price and Rhoads;
                                                      Associate Counsel,
                                                      Metropolitan Life
                                                      Insurance Company.

* Denotes those Trustees who are "interested persons" (as defined in Section 2(a)(19) of the 1940 Act) of the Fund, PIMCO Advisors, PIMCO or one or more of the Underwriters. Mr. Treadway is an "interested person" because of his affiliation with PIMCO Advisors.

As of June 20, 2001, the Fund's officers and Trustees as a group owned less than 1% of the outstanding Common Shares.

As of June 20, 2001, PIMCO Advisors owned of record 6,667 Common Shares, representing 100% of the Fund's outstanding shares.

Messrs. Belica, Connor and Treadway also serve as Trustees of PIMCO California Municipal Income Fund and PIMCO New York Municipal Income Fund (together with the Fund, the "Municipal Funds"), two closed-end funds for which PIMCO Advisors serves as Investment Manager and PIMCO serves as Portfolio Manager. In addition, Mr. Belica is a director or Trustee, as the case may be, of one open-end investment company (with two series) advised by PIMCO Advisors. Mr. Connor is a director or Trustee, as the case may be, of one open-end investment company (with two series) and one closed-end investment company advised by PIMCO Advisors. Mr. Treadway is a director or Trustee, as the case may be, of two open-end investment companies (which have multiple series) and seven closed-end investment companies advised by PIMCO Advisors or its affiliates. None of the independent Trustees has ever been a director, officer, or employee of, or a

31

consultant to, PIMCO Advisors, PIMCO, any one or more of the Underwriters or any one or more affiliates of any of the foregoing. As indicated above, certain of the officers and Trustees of the Fund are affiliated with PIMCO Advisors and/or PIMCO.

The Common Shareholders of the Fund will elect Trustees at the next annual meeting of Common Shareholders, unless any Preferred Shares are outstanding at that time, in which event holders of Preferred Shares, voting as a separate class, will elect two Trustees and the remaining Trustees shall be elected by Common Shareholders and holders of Preferred Shares, voting together as a single class. Holders of Preferred Shares will be entitled to elect a majority of the Fund's Trustees under certain circumstances. See "Description of Shares-- Preferred Shares--Voting Rights." See "Certain Provisions in the Declaration of Trust--Anti-Takeover Provisions" for a description of the various classes of Trustees and their terms in office.

Each Municipal Fund has the same Board of Trustees. The Municipal Funds are expected to hold joint meetings of their Boards of Trustees whenever possible. Each Trustee, other than those affiliated with PIMCO Advisors or its affiliates, receives $6,000 for each joint meeting ($2,000 for each Municipal Fund) for the first four joint meetings in each year and $3,000 for each additional joint meeting ($1,000 for each Municipal Fund) in such year if the meetings are attended in person. Trustees receive $1,500 per joint meeting ($500 for each Municipal Fund) if the meetings are attended telephonically. Members of the Audit Oversight Committee will receive $1,500 per joint meeting ($500 for each Municipal Fund) of the Municipal Funds' Audit Oversight Committees if the meeting takes place on a day other than the day of a regularly scheduled Board meeting. Trustees will also be reimbursed for meeting-related expenses.

The Municipal Funds will allocate the costs of their joint meetings to the Municipal Funds pro rata based on the Funds' net assets, including assets attributable to any Preferred Shares that may be outstanding.

It is estimated that the Trustees will receive the amounts set forth below for the fiscal year ending April 30, 2002. For the calendar year ended December 31, 2000, the Trustees received the compensation set forth below for serving as trustees of other funds in the "Fund Complex." The officers and Trustees affiliated with PIMCO Advisors serve without any compensation from the Fund.

                                                        Total Compensation
                         Estimated Compensation     from the Fund Complex Paid
                         from the Fund for the        to the Trustees for the
                           Fiscal Year Ended            Calendar Year Ended
      Name of Trustee       April 30, 2002*             December 31, 2000**
      ---------------       ---------------             -----------------

Paul Belica                     $10,080                       $2,000

Robert E. Connor                $10,080                       $8,550


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* Since the Fund has not completed its first full fiscal year, compensation is estimated based upon future payments to be made and upon estimated relative Fund net assets.

**During the year ended December 31, 2000, Mr. Belica served as a Trustee of one open-end investment company (comprising two separate investment portfolios) advised by PIMCO Advisors, and Mr. Connor served as a director or Trustee of one open-end investment company (comprising two separate investment portfolios) and one closed-end investment company advised by PIMCO Advisors. These investment companies are considered to be in the same "Fund Complex" as the Fund.

The Fund has no employees. Its officers are compensated by PIMCO Advisors and/or PIMCO.

INVESTMENT MANAGER AND PORTFOLIO MANAGER

Investment Manager

PIMCO Advisors serves as investment manager to the Fund pursuant to an investment management agreement (the "Investment Management Agreement") between it and the Fund. PIMCO Advisors was organized as a limited partnership under Delaware law in 1987. Its sole general partner is Pacific-Allianz Partners LLC. Pacific-Allianz Partners LLC is a Delaware limited liability company with two members, Allianz GP Sub LLC, a Delaware limited liability company, and Pacific Asset Management LLC, a Delaware limited liability company. Allianz GP Sub LLC is a wholly-owned subsidiary of Allianz of America, Inc., which is a wholly- owned subsidiary of Allianz AG. Pacific Asset Management LLC is a wholly-owned subsidiary of Pacific Life Insurance Company, which is a wholly-owned subsidiary of Pacific Mutual Holding Company. Allianz AG is a German based insurer. Pacific Mutual Holding Company is a Newport Beach, California based insurance holding company.

The general partner of PIMCO Advisors has substantially delegated its management and control of PIMCO Advisors to an Executive Committee. The Executive Committee is comprised of Joachim Faber, Udo Frank, Kenneth M. Poovey, William S. Thompson, Jr. and Marcus Riess.

PIMCO Advisors is located at 1345 Avenue of the Americas, New York, New York 10105. PIMCO Advisors and its subsidiary partnerships and limited liability companies had approximately $275 billion of assets under management as of March 31, 2001.

Agreement with Allianz AG

On May 5, 2000, the general partners of PIMCO Advisors closed the transactions contemplated by the Implementation and Merger Agreement dated as of October 31, 1999 ("Implementation Agreement"), as amended March 3, 2000, with Allianz of America, Inc. ("Allianz of America"), Pacific Asset Management LLC, PIMCO Partners, LLC, PIMCO Holding LLC, PIMCO Partners, G.P., and other parties to the Implementation Agreement. As a result of completing these transactions, PIMCO Advisors is now majority-owned indirectly by Allianz AG, with subsidiaries of Pacific Life Insurance Company ("Pacific Life") retaining a significant minority interest. Allianz AG is a German-based insurer. Pacific Life is a Newport Beach, California-based insurer.

In connection with the closing, Allianz of America entered into a put/call arrangement for the possible disposition of Pacific Life's indirect interest in PIMCO Advisors. The put option

33

held by Pacific Life will allow it to require Allianz of America, on the last business day of each calendar quarter following the closing, to purchase at a formula-based price all of the PIMCO Advisors' units owned directly or indirectly by Pacific Life. The call option held by Allianz of America will allow it, beginning January 31, 2003 or upon a change in control of Pacific Life, to require Pacific Life to sell or cause to be sold to Allianz of America, at the same formula-based price, all of the PIMCO Advisors' units owned directly or indirectly by Pacific Life. Allianz AG's address is Koniginstrasse 28, D- 80802, Munich, Germany. Pacific Life's address is 700 Newport Center Drive, Newport Beach, CA 92660.

Allianz AG, the parent of Allianz of America, is a publicly traded German company which, together with its subsidiaries, comprises the world's second largest insurance company as measured by premium income. Allianz AG is a leading provider of financial services, particularly in Europe, and is represented in 68 countries world-wide through subsidiaries, branch and representative offices, and other affiliated entities. As of June 30, 2000, the Allianz Group (including PIMCO Advisors and PIMCO) had assets under management of more than $650 billion, and in its last fiscal year wrote approximately $50 billion in gross insurance premiums.

As of the date of this Statement of Additional Information, significant institutional shareholders of Allianz AG currently include Dresdner Bank AG, Munich Reinsurance and HypoVereinsbank. Credit Lyonnais, Munich Reinsurance, HypoVereinsbank and Dresdner Bank AG, as well as certain broker-dealers that might be controlled by or affiliated with these entities, such as DB Alex. Brown LLC and Dresdner Klienwort Benson North America LLC (collectively, the "Affiliated Brokers"), may be considered to be affiliated persons of PIMCO Advisors and PIMCO. Absent an SEC exemption or other relief, the Fund generally is precluded from effecting principal transactions with the Affiliated Brokers, and its ability to purchase securities being underwritten by an Affiliated Broker or a syndicate including an Affiliated Broker or to utilize the Affiliated Brokers for agency transactions is subject to restrictions. PIMCO does not believe that the restrictions on transactions with the Affiliated Brokers described above materially adversely affect its ability to provide services to the Fund, the Fund's ability to take advantage of market opportunities, or the Fund's overall performance.

PIMCO Advisors, subject to the supervision of the Board of Trustees, is responsible for managing, either directly or through others selected by PIMCO Advisers, the investments of the Fund. PIMCO Advisors also furnishes to the Board of Trustees periodic reports on the investment performance of the Fund. As more fully discussed below, PIMCO Advisors has retained PIMCO, its affiliate, to serve as the Fund's portfolio manager.

Under the terms of the Investment Management Agreement, subject to such policies as the Trustees of the Trust may determine, PIMCO Advisors, at its expense, will furnish continuously an investment program for the Fund and will make investment decisions on behalf of the Fund and place all orders for the purchase and sale of portfolio securities subject always to the Fund's investment objective, policies and restrictions; provided that, so long as PIMCO serves as the portfolio manager for the Fund, PIMCO Advisors' obligation under the Investment Management Agreement with respect to the Fund is, subject always to the control of the Trustees, to determine and review with PIMCO the investment policies of the Fund.

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Subject to the control of the Trustees, PIMCO Advisors also manages, supervises and conducts the other affairs and business of the Fund, furnishes office space and equipment, provides bookkeeping and certain clerical services (excluding determination of the net asset value of the Fund, shareholder accounting services and the accounting services for the Fund) and pays all salaries, fees and expenses of officers and Trustees of the Fund who are affiliated with PIMCO Advisors. As indicated under "Portfolio Transactions-- Brokerage and Research Services," the Fund's portfolio transactions may be placed with broker-dealers which furnish PIMCO Advisors and PIMCO, without cost, certain research, statistical and quotation services of value to them or their respective affiliates in advising the Fund or their other clients. In so doing, the Fund may incur greater brokerage commissions and other transactions costs than it might otherwise pay.

Pursuant to the Investment Management Agreement, the Fund has agreed to pay PIMCO Advisors an annual management fee, payable on a monthly basis, at the annual rate of 0.65% of the Fund's average daily net assets (including net assets attributable to Preferred Shares) for the services and facilities it provides. All fees and expenses are accrued daily and deducted before payment of dividends to investors.

From the commencement of the Fund's operations through June 30, 2009, PIMCO Advisors has contractually agreed to waive a portion of the management fees it is entitled to receive from the Fund in the amounts, and for the time periods, set forth below:

Period Ending          Percentage                               Percentage
June 30                 Waived                                   Waived
--------------     (annual rate as a     Period Ending      (annual rate as a
                 percentage of average   June 30          percentage of average
                 daily net assets) /1/   --------------   daily net assets) /1/
                -----------------------                  -----------------------
2002/2/........          0.20%           2006...........           0.20%
2003...........          0.20%           2007...........           0.15%
2004...........          0.20%           2008...........           0.10%
2005...........          0.20%           2009...........           0.05%


       ___________________

/1/ Including net assets attributable to Preferred Shares. /2/ From the commencement of the Fund's operations.

PIMCO Advisors has not agreed to waive any portion of its fees beyond June 30, 2009.

Except as otherwise described in the Prospectus, the Fund pays, in addition to the investment management fee described above, all expenses not assumed by PIMCO Advisors, including, without limitation, fees and expenses of Trustees who are not "interested persons" of PIMCO Advisors or the Fund, interest charges, taxes, brokerage commissions, expenses of issue of shares, fees and expenses of registering and qualifying the Fund and its classes of shares for distribution under federal and state laws and regulations, charges of custodians, auditing and legal expenses, expenses of determining net asset value of the Fund, reports to shareholders,

35

expenses of meetings of shareholders, expenses of printing and mailing prospectuses, proxy statements and proxies to existing shareholders, and its proportionate share of insurance premiums and professional association dues or assessments. The Fund is also responsible for such nonrecurring expenses as may arise, including litigation in which the Fund may be a party, and other expenses as determined by the Trustees. The Fund may have an obligation to indemnify its officers and Trustees with respect to such litigation.

Portfolio Manager

PIMCO serves as portfolio manager for the Fund pursuant to a portfolio management agreement (the "Portfolio Management Agreement") between PIMCO and PIMCO Advisors. Under the Portfolio Management Agreement, subject always to the control of the Trustees and the supervision of PIMCO Advisors, PIMCO's obligation is to furnish continuously an investment program for the Fund, to make investment decisions on behalf of the Fund and to place all orders for the purchase and sale of portfolio securities and all other investments for the Fund.

Under the Portfolio Management Agreement, PIMCO Advisors pays a portion of the fees it receives from the Fund to PIMCO in return for PIMCO's services, at the maximum annual rate of 0.37% of the Fund's average daily net assets (including assets attributable to any Preferred Shares that may be outstanding). PIMCO has contractually agreed to waive a portion of the fee it is entitled to receive from PIMCO Advisors such that PIMCO will receive 0.25% of the Fund's average daily net assets from the commencement of Fund operations through June 30, 2006 (i.e., roughly the first 5 years of Fund operations), 0.28% of average daily net assets in year 6, 0.31% in year 7, and 0.34% in year 8.

Originally organized in 1971, reorganized as a Delaware general partnership in 1994 and reorganized as a Delaware limited liability company in 2000, PIMCO provides investment management and advisory services to private accounts of institutional and individual clients and to mutual funds. The membership interests of PIMCO as of January 1, 2001, were held 94% by PIMCO Advisors and 6% by the managing directors of PIMCO. As of March 31, 2001, PIMCO had approximately $220 billion in assets under management. PIMCO is located at 840 Newport Center Drive, Newport Beach, California 92660.

Certain Terms of the Investment Management Agreement and Portfolio Management Agreement. The Investment Management Agreement and the Portfolio Management Agreement were each approved by the Trustees of the Fund (including all of the Trustees who are not "interested persons" of PIMCO Advisors or PIMCO). The Investment Management Agreement and Portfolio Management Agreement will each continue in force with respect to the Fund for two years from their respective dates, and from year to year thereafter, but only so long as their continuance is approved at least annually by (i) vote, cast in person at a meeting called for that purpose, of a majority of those Trustees who are not "interested persons" of PIMCO Advisors, PIMCO or the Fund, and by (ii) the majority vote of either the full Board of Trustees or the vote of a majority of the outstanding shares of all classes of the Fund. Each of the Investment Management Agreement and Portfolio Management Agreement automatically terminates on assignment. The Investment Management Agreement may be terminated on not less than 60 days' notice by PIMCO Advisors to the Fund or by the Fund to PIMCO Advisors. The Portfolio

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Management Agreement may be terminated on not less than 60 days' notice by PIMCO Advisors to PIMCO or by PIMCO to PIMCO Advisors, or by the Fund at any time by notice to PIMCO Advisors and PIMCO.

The Investment Management Agreement and the Portfolio Management Agreement each provide that PIMCO Advisors or PIMCO, as applicable, shall not be subject to any liability in connection with the performance of its services thereunder in the absence of willful misfeasance, bad faith, gross negligence or reckless disregard of its obligations and duties.

Codes of Ethics

The Fund, PIMCO Advisors and PIMCO have each adopted a separate code of ethics governing personal trading activities of, as applicable, all Trustees and officers of the Fund, and directors, officers and employees of PIMCO Advisors and PIMCO, who, in connection with their regular functions, play a role in the recommendation of any purchase or sale of a security by the Fund or obtain information pertaining to such purchase or sale or who have the power to influence the management or policies of the Fund, PIMCO Advisors or PIMCO, as applicable. Such persons are prohibited from effecting certain transactions, allowed to effect certain exempt transactions (including with respect to securities that may be purchased or held by the Fund), required to preclear certain security transactions with the applicable compliance officer or his designee and to report certain transactions on a regular basis. The Fund, PIMCO Advisors and PIMCO have each developed procedures for administration of their respective codes. Text-only versions of the codes of ethics can be viewed online or downloaded from the EDGAR Database on the SEC's internet web site at www.sec.gov. You may also review and copy those documents by visiting the SEC's Public Reference Room in Washington, DC. Information on the operation of the Public Reference Room may be obtained by calling the SEC at 202-942-8090. In addition, copies of the codes of ethics may be obtained, after mailing the appropriate duplicating fee, by writing to the SEC's Public Reference Section, 450 5th Street, N.W., Washington, DC 20549-0102 or by e-mail request at publicinfo@sec.gov.

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PORTFOLIO TRANSACTIONS

Investment Decisions and Portfolio Transactions

Investment decisions for the Fund and for the other investment advisory clients of PIMCO Advisors and PIMCO are made with a view to achieving their respective investment objectives. Investment decisions are the product of many factors in addition to basic suitability for the particular client involved (including the Fund). Some securities considered for investments by the Fund may also be appropriate for other clients served by PIMCO Advisors and PIMCO. Thus, a particular security may be bought or sold for certain clients even though it could have been bought or sold for other clients at the same time. If a purchase or sale of securities consistent with the investment policies of the Fund and one or more of these clients served by PIMCO Advisors or PIMCO is considered at or about the same time, transactions in such securities will be allocated among the Fund and clients in a manner deemed fair and reasonable by PIMCO Advisors or PIMCO, as applicable. PIMCO Advisors or PIMCO may aggregate orders for the Fund with simultaneous transactions entered into on behalf of its other clients so long as price and transaction expenses are averaged either for that transaction or for the day. Likewise, a particular security may be bought for one or more clients when one or more clients are selling the security. In some instances, one client may sell a particular security to another client. It also sometimes happens that two or more clients simultaneously purchase or sell the same security, in which event each day's transactions in such security are, insofar as possible, averaged as to price and allocated between such clients in a manner which PIMCO Advisors or PIMCO believes is equitable to each and in accordance with the amount being purchased or sold by each. There may be circumstances when purchases or sales of portfolio securities for one or more clients will have an adverse effect on other clients.

Brokerage and Research Services

There is generally no stated commission in the case of fixed income securities, which are traded in the over-the-counter markets, but the price paid by the Fund usually includes an undisclosed dealer commission or mark-up. In underwritten offerings, the price paid by the Fund includes a disclosed, fixed commission or discount retained by the underwriter or dealer. Transactions on U.S. stock exchanges and other agency transactions involve the payment by the Fund of negotiated brokerage commissions. Such commissions vary among different brokers. Also, a particular broker may charge different commissions according to such factors as the difficulty and size of the transaction.

Subject to the supervision of PIMCO Advisors, PIMCO places all orders for the purchase and sale of portfolio securities, options, futures contracts and other instruments for the Fund and buys and sells such securities, options, futures and other instruments for the Fund through a substantial number of brokers and dealers. In so doing, PIMCO uses its best efforts to obtain for the Fund the most favorable price and execution available, except to the extent it may be permitted to pay higher brokerage commissions as described below. In seeking the most favorable price and execution, PIMCO, having in mind the Fund's best interests, considers all factors it deems relevant, including, by way of illustration, price, the size of the transaction, the nature of the market for the security, the amount of the commission, the timing of the transaction taking into account market prices and trends, the reputation, experience and financial stability of

38

the broker-dealer involved and the quality of service rendered by the broker- dealer in other transactions.

Subject to the supervision of PIMCO Advisors, PIMCO places orders for the purchase and sale of portfolio investments for the Fund's account with brokers or dealers selected by it in its discretion. In effecting purchases and sales of portfolio securities for the account of the Fund, PIMCO will seek the best price and execution of the Fund's orders. In doing so, the Fund may pay higher commission rates than the lowest available when PIMCO believes it is reasonable to do so in light of the value of the brokerage and research services provided by the broker effecting the transaction, as discussed below.

It has for many years been a common practice in the investment advisory business for advisers of investment companies and other institutional investors to receive research services from broker-dealers which execute portfolio transactions for the clients of such advisers. Consistent with this practice, PIMCO may receive research services from many broker-dealers with which PIMCO places the Fund's portfolio transactions. PIMCO may also receive research or research credits from brokers which are generated from underwriting commissions when purchasing new issues of fixed income securities or other assets for the Fund. These services, which in some cases may also be purchased for cash, include such matters as general economic and security market reviews, industry and company reviews, evaluations of securities and recommendations as to the purchase and sale of securities. Some of these services are of value to PIMCO in advising various of its clients (including the Fund), although not all of these services are necessarily useful and of value in managing the Fund. Neither the management fee paid by the Fund to PIMCO Advisors nor the portfolio management fee paid by PIMCO Advisors to PIMCO is reduced because PIMCO and its affiliates receive such services.

As permitted by Section 28(e) of the Securities Exchange Act of 1934, PIMCO may cause the Fund to pay a broker-dealer which provides "brokerage and research services" (as defined in such Act) to PIMCO an amount of disclosed commission for effecting a securities transaction for the Fund in excess of the commission which another broker-dealer would have charged for effecting that transaction.

The Fund may use broker-dealers that are affiliates (or affiliates of affiliates) of the Fund, PIMCO Advisors and/or PIMCO, subject to certain restrictions discussed above under "Investment Manager and Portfolio Manager- Investment Adviser-Agreement with Allianz AG."

References to PIMCO in this section would apply equally to PIMCO Advisors if PIMCO Advisors were to assume portfolio management responsibilities for the Fund and place orders for the purchase and sale of the Fund's portfolio investments.

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DISTRIBUTIONS

As described in the Fund's Prospectus, initial distributions to Common Shareholders are expected to be declared approximately 45 days, and paid approximately 60 to 90 days, from the completion of the offering of the Common Shares, depending on market conditions. To permit the Fund to maintain a more stable monthly distribution, the Fund will initially (prior to its first distribution), and may from time to time thereafter, distribute less than the entire amount of net investment income earned in a particular period. Such undistributed net investment income would be available to supplement future distributions, including distributions which might otherwise have been reduced by a decrease in the Fund's monthly net income due to fluctuations in investment income or expenses, or due to an increase in the dividend rate on the Fund's outstanding Preferred Shares. As a result, the distributions paid by the Fund for any particular period may be more or less than the amount of net investment income actually earned by the Fund during such period. Undistributed net investment income will be added to the Fund's net asset value and, correspondingly, distributions from undistributed net investment income will be deducted from the Fund's net asset value.

For tax purposes, the Fund is currently required to allocate net capital gain and other taxable income, if any, between Common Shares and any Preferred Shares in proportion to total distributions paid to each class for the year in which such net capital gain or other taxable income is realized. For information relating to the impact of the issuance of Preferred Shares on the distributions made by the Fund to Common Shareholders, see the Fund's Prospectus under "Preferred Shares and Related Leverage."

While any Preferred Shares are outstanding, the Fund may not declare any cash dividend or other distribution on its Common Shares unless at the time of such declaration (1) all accumulated dividends on the Preferred Shares have been paid and (2) the net asset value of the Fund's portfolio (determined after deducting the amount of such dividend or other distribution) is at least 200% of the liquidation value of any outstanding Preferred Shares. This latter limitation on the Fund's ability to make distributions on its Common Shares could cause the Fund to incur income and excise tax and, under certain circumstances, impair the ability of the Fund to maintain its qualification for taxation as a regulated investment company. See "Tax Matters."

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DESCRIPTION OF SHARES

Common Shares

The Fund's Declaration of Trust (the "Declaration") authorizes the issuance of an unlimited number of Common Shares. The Common Shares will be issued without par value. All Common Shares of the Fund have equal rights as to the payment of dividends and the distribution of assets upon liquidation of the Fund. Common Shares will, when issued, be fully paid and, subject to matters discussed in "Certain Provisions in the Declaration of Trust-Shareholder Liability" below, non-assessable, and will have no pre-emptive or conversion rights or rights to cumulative voting. At any time when the Fund's Preferred Shares are outstanding, Common Shareholders will not be entitled to receive any distributions from the Fund unless all accrued dividends on Preferred Shares have been paid, and unless asset coverage (as defined in the 1940 Act) with respect to Preferred Shares would be at least 200% after giving effect to such distributions. See "Preferred Shares" below.

The Common Shares have been approved for listing on the New York Stock Exchange, subject to notice of issuance. The Fund intends to hold annual meetings of shareholders so long as the Common Shares are listed on a national securities exchange and such meetings are required as a condition to such listing.

Shares of closed-end investment companies may frequently trade at prices lower than net asset value. Shares of closed-end investment companies like the Fund that invest predominantly in investment grade Municipal Bonds have during some periods traded at prices higher than net asset value and during other periods traded at prices lower than net asset value. There can be no assurance that Common Shares or shares of other municipal funds will trade at a price higher than net asset value in the future. Net asset value will be reduced immediately following the offering of Common Shares after payment of the sales load and organization and offering expenses. Net asset value generally increases when interest rates decline, and decreases when interest rates rise, and these changes are likely to be greater in the case of a fund having a leveraged capital structure. Whether investors will realize gains or losses upon the sale of Common Shares will not depend upon the Fund's net asset value but will depend entirely upon whether the market price of the Common Shares at the time of sale is above or below the original purchase price for the shares. Since the market price of the Fund's Common Shares will be determined by factors beyond the control of the Fund, the Fund cannot predict whether the Common Shares will trade at, below, or above net asset value or at, below or above the initial public offering price. Accordingly, the Common Shares are designed primarily for long-term investors, and investors in the Common Shares should not view the Fund as a vehicle for trading purposes. See "Repurchase of Fund Shares; Conversion to Open-End Fund" and the Fund's Prospectus under "Preferred Shares and Related Leverage" and "The Fund's Investments--Municipal Bonds."

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Preferred Shares

The Declaration authorizes the issuance of an unlimited number of Preferred Shares. The Preferred Shares will be issued in one or more classes or series, with such par value and rights as determined by the Board of Trustees of the Fund, by action of the Board of Trustees without the approval of the Common Shareholders.

The Fund's Board of Trustees has indicated its intention to authorize an offering of Preferred Shares (representing approximately 35% of the Fund's capital immediately after the time the Preferred Shares are issued) within approximately one to three months after completion of the offering of Common Shares, subject to market conditions and to the Board's continuing belief that leveraging the Fund's capital structure through the issuance of Preferred Shares is likely to achieve the benefits to the Common Shareholders described in the Prospectus and this Statement of Additional Information. Although the terms of the Preferred Shares, including their dividend rate, voting rights, liquidation preference and redemption provisions, will be determined by the Board of Trustees (subject to applicable law and the Declaration) if and when it authorizes a Preferred Shares offering, the Board has stated that the initial series of Preferred Shares would likely pay cumulative dividends at relatively shorter-term periods (such as 7 days); by providing for the periodic redetermination of the dividend rate through an auction or remarketing procedure. The liquidation preference, preference on distribution, voting rights and redemption provisions of the Preferred Shares are expected to be as stated below.

Limited Issuance of Preferred Shares. Under the 1940 Act, the Fund could issue Preferred Shares with an aggregate liquidation value of up to one-half of the value of the Fund's total net assets, measured immediately after issuance of the Preferred Shares. "Liquidation value" means the original purchase price of the shares being liquidated plus any accrued and unpaid dividends. In addition, the Fund is not permitted to declare any cash dividend or other distribution on its Common Shares unless the liquidation value of the Preferred Shares is less than one-half of the value of the Fund's total net assets (determined after deducting the amount of such dividend or distribution) immediately after the distribution. If the Fund sells all the Common Shares and Preferred Shares discussed in this Prospectus, the liquidation value of the Preferred Shares is expected to be approximately 35% of the value of the Fund's total net assets. The Fund intends to purchase or redeem Preferred Shares, if necessary, to keep that fraction below one-half.

Distribution Preference. The Preferred Shares have complete priority over the Common Shares as to distribution of assets.

Liquidation Preference. In the event of any voluntary or involuntary liquidation, dissolution or winding up of the affairs of the Fund, holders of Preferred Shares will be entitled to receive a preferential liquidating distribution (expected to equal the original purchase price per share plus accumulated and unpaid dividends thereon, whether or not earned or declared) before any distribution of assets is made to holders of Common Shares. After payment of the full amount of the liquidating distribution to which they are entitled, holders of Preferred Shares will not be entitled to any further participation in any distribution of assets by the Fund. A consolidation or merger of the Fund with or into any Massachusetts business trust or corporation

42

or a sale of all or substantially all of the assets of the Fund shall not be deemed to be a liquidation, dissolution or winding up of the Fund.

Voting Rights. In connection with any issuance of Preferred Shares, the Fund must comply with Section 18(i) of the 1940 Act which requires, among other things, that Preferred Shares be voting shares. Except as otherwise provided in the Declaration or the Fund's By-Laws or otherwise required by applicable law, holders of Preferred Shares will vote together with Common Shareholders as a single class.

In connection with the election of the Fund's Trustees, holders of Preferred Shares, voting as a separate class, will also be entitled to elect two of the Fund's Trustees, and the remaining Trustees shall be elected by Common Shareholders and holders of Preferred Shares, voting together as a single class. In addition, if at any time dividends on the Fund's outstanding Preferred Shares shall be unpaid in an amount equal to two full years' dividends thereon, the holders of all outstanding Preferred Shares, voting as a separate class, will be entitled to elect a majority of the Fund's Trustees until all dividends in arrears have been paid or declared and set apart for payment.

The affirmative vote of the holders of a majority of the outstanding Preferred Shares, voting as a separate class, shall be required to approve any action requiring a vote of security holders under Section 13(a) of the 1940 Act including, among other things, changes in the Fund's investment objective, the conversion of the Fund from a closed-end to an open-end company, or changes in the investment restrictions described as fundamental policies under "Investment Restrictions." The class or series vote of holders of Preferred Shares described above shall in each case be in addition to any separate vote of the requisite percentage of Common Shares and Preferred Shares necessary to authorize the action in question.

The foregoing voting provisions will not apply with respect to the Fund's Preferred Shares if, at or prior to the time when a vote is required, such shares shall have been (1) redeemed or (2) called for redemption and sufficient funds shall have been deposited in trust to effect such redemption.

Redemption, Purchase and Sale of Preferred Shares by the Fund. The terms of the Preferred Shares may provide that they are redeemable at certain times, in whole or in part, at the original purchase price per share plus accumulated dividends, that the Fund may tender for or purchase Preferred Shares and that the Fund may subsequently resell any shares so tendered for or purchased. Any redemption or purchase of Preferred Shares by the Fund will reduce the leverage applicable to Common Shares, while any resale of shares by the Fund will increase such leverage.

The discussion above describes the Fund's Board of Trustees' present intention with respect to a possible offering of Preferred Shares. If the Board of Trustees determines to authorize such an offering, the terms of the Preferred Shares may be the same as, or different from, the terms described above, subject to applicable law and the Declaration.

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CERTAIN PROVISIONS IN THE DECLARATION OF TRUST

Shareholder Liability

Under Massachusetts law, shareholders could, under certain circumstances, be held personally liable for the obligations of the Fund. However, the Declaration contains an express disclaimer of shareholder liability for acts or obligations of the Fund and requires that notice of such disclaimer be given in each agreement, obligation or instrument entered into or executed by the Fund or the Trustees. The Declaration also provides for indemnification out of the Fund's property for all loss and expense of any shareholder held personally liable on account of being or having been a shareholder. Thus, the risk of a shareholder incurring financial loss on account of shareholder liability is limited to circumstances in which such disclaimer is inoperative or the Fund is unable to meet its obligations, and thus should be considered remote.

Anti-Takeover Provisions

As described below, the Declaration includes provisions that could have the effect of limiting the ability of other entities or persons to acquire control of the Fund or to change the composition of its Board of Trustees, and could have the effect of depriving Common Shareholders of opportunities to sell their Common Shares at a premium over prevailing market prices by discouraging a third party from seeking to obtain control of the Fund.

Commencing with the first annual meeting of shareholders, the Board of Trustees will be divided into three classes (Class I, Class II and Class III). At each annual meeting of shareholders, the term of one class will expire and each Trustee elected to that class will hold office for a term of three years. The classification of the Board of Trustees in this manner could delay for an additional year the replacement of a majority of the Board of Trustees. In addition, the Declaration provides that a Trustee may be removed only for cause and only (i) by action of at least seventy-five percent (75%) of the outstanding shares of the classes or series of shares entitled to vote for the election of such Trustee, or (ii) by at least seventy-five percent (75%) of the remaining Trustees.

Except as provided in the next paragraph, the affirmative vote or consent of at least seventy-five percent (75%) of the Board of Trustees and at least seventy-five percent (75%) of the shares of the Fund outstanding and entitled to vote thereon are required to authorize any of the following transactions (each a "Material Transaction"): (1) a merger, consolidation or share exchange of the Fund or any series or class of shares of the Fund with or into any other person or company, or of any such person or company with or into the Fund or any such series or class of shares; (2) the issuance or transfer by the Fund or any series or class of shares (in one or a series of transactions in any twelve- month period) of any securities of the Fund or such series or class to any other person or entity for cash, securities or other property (or combination thereof) having an aggregate fair market value of $1,000,000 or more, excluding sales of securities of the Fund or such series or class in connection with a public offering, issuances of securities of the Fund or such series or class pursuant to a dividend reinvestment plan adopted by the Fund and issuances of securities of the Fund or such series or class upon the exercise of any stock subscription rights distributed by the Fund; or (3) a sale, lease, exchange, mortgage, pledge,

44

transfer or other disposition by the Fund or any series or class of shares (in one or a series of transactions in any twelve-month period) to or with any person of any assets of the Fund or such series or class having an aggregate fair market value of $1,000,000 or more, except for transactions in securities effected by the Fund or such series or class in the ordinary course of its business. The same affirmative votes are required with respect to and any shareholder proposal as to specific investment decisions made or to be made with respect to the Fund's assets.

Notwithstanding the approval requirements specified in the preceding paragraph, the Declaration provides that no vote or consent of the Fund's shareholders will be required to authorize a Material Transaction if the transaction is approved by a vote of both a majority of the Board of Trustees and seventy-five percent (75%) of the Continuing Trustees (as defined below), so long as all other conditions and requirements, if any, provided for in the Fund's By-Laws and applicable law have been satisfied.

In addition, the Declaration provides that that Fund may be terminated at any time by vote or consent of at least seventy-five percent (75%) of the Fund's shares or, alternatively, by vote or consent of both a majority of the Board of Trustees and seventy-five percent (75%) of the Continuing Trustees (as defined below).

In certain circumstances, the Declaration also imposes shareholder voting requirements that are more demanding that those required under the 1940 Act in order to authorize a conversion of the Fund from a closed-end to an open-end investment company. See "Repurchase of Fund Shares; Conversion to Open-End Fund" below.

As noted, the voting provisions described above could have the effect of depriving Common Shareholders of an opportunity to sell their Common Shares at a premium over prevailing market prices by discouraging a third party from seeking to obtain control of the Fund in a tender offer or similar transaction. In the view of the Fund's Board of Trustees, however, these provisions offer several possible advantages, including: (1) requiring persons seeking control of the Fund to negotiate with its management regarding the price to be paid for the amount of Common Shares required to obtain control; (2) promoting continuity and stability; and (3) enhancing the Fund's ability to pursue long-term strategies that are consistent with its

45

investment objective and management policies. The Board of Trustees has determined that the voting requirements described above, which are generally greater than the minimum requirements under the 1940 Act, are in the best interests of the Fund's Common Shareholders generally.

A "Continuing Trustee," as used in the discussion above, is any member of the Fund's Board of Trustees (1) who is not a person or affiliate of a person who enters or proposes to enter into a Material Transaction with the Fund (such a person or affiliate being referred to individually as an "Interested Party") and who has been a member of the Board of Trustees for a period of at least twelve months (or since the commencement of the Fund's operations, if less than twelve months), or (2) who is a successor of a Continuing Trustee who is unaffiliated with an Interested Party and is recommended to succeed a Continuing Trustees by a majority of the Continuing Trustees then members of the Fund's Board of Trustees.

The foregoing is intended only as a summary and is qualified in its entirety by reference to the full text of the Declaration and the Fund's By- Laws, both of which have been filed as exhibits to the Fund's registration statement on file with the SEC.

Liability of Trustees

The Declaration provides that the obligations of the Fund are not binding upon the Trustees of the Fund individually, but only upon the assets and property of the Fund, and that the Trustees shall not be liable for errors of judgment or mistakes of fact or law. Nothing in the Declaration, however, protects a Trustee against any liability to which he would otherwise be subject by reason of willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of his office.

REPURCHASE OF FUND SHARES; CONVERSION TO OPEN-END FUND

The Fund is a closed-end investment company and as such its shareholders will not have the right to cause the Fund to redeem their shares. Instead, the Fund's Common Shares will trade in the open market at a price that will be a function of several factors, including dividend levels (which are in turn affected by expenses), net asset value, call protection, price, dividend stability, relative demand for and supply of such shares in the market, general market and economic conditions and other factors. Shares of a closed-end investment company may frequently trade at prices lower than net asset value. The Fund's Board of Trustees regularly monitors the relationship between the market price and net asset value of the Common Shares. If the Common Shares were to trade at a substantial discount to net asset value for an extended period of time, the Board may consider the repurchase of its Common Shares on the open market or in private transactions, or the making of a tender offer for such shares. There can be no assurance, however, that the Board of Trustees will decide to take or propose any of these actions, or that share repurchases or tender offers, if undertaken, will reduce market discount. The Fund has no present intention to repurchase its Common Shares and would do so only in the circumstances described in this section.

Notwithstanding the foregoing, at any time when the Fund's Preferred Shares are outstanding, the Fund may not purchase, redeem or otherwise acquire any of its Common Shares unless (1) all accrued Preferred Shares dividends have been paid and (2) at the time of such

46

purchase, redemption or acquisition, the net asset value of the Fund's portfolio (determined after deducting the acquisition price of the Common Shares) is at least 200% of the liquidation value of the outstanding Preferred Shares (expected to equal the original purchase price per share plus any accrued and unpaid dividends thereon).

Subject to its investment limitations, the Fund may borrow to finance the repurchase of shares or to make a tender offer. Interest on any borrowings to finance share repurchase transactions or the accumulation of cash by the Fund in anticipation of share repurchases or tenders will reduce the Fund's net income. Any share repurchase, tender offer or borrowing that might be approved by the Board of Trustees would have to comply with the Securities Exchange Act of 1934, as amended, and the 1940 Act and the rules and regulations thereunder.

The Fund's Board of Trustees may also from time to time consider submitting to the holders of the shares of beneficial interest of the Fund a proposal to convert the Fund to an open-end investment company. In determining whether to exercise its sole discretion to submit this issue to shareholders, the Board of Trustees would consider all factors then relevant, including the relationship of the market price of the Common Shares to net asset value, the extent to which the Fund's capital structure is leveraged and the possibility of re-leveraging, the spread, if any, between the yields on securities in the Fund's portfolio and interest and dividend charges on Preferred Shares issued by the Fund and general market and economic conditions.

The Declaration requires the affirmative vote or consent of holders of at least seventy-five percent (75%) of each class of the Fund's shares entitled to vote on the matter to authorize a conversion of the Fund from a closed-end to an open-end investment company, unless the conversion is authorized by both a majority of the Board of Trustees and seventy-five percent (75%) of the Continuing Trustees (as defined above under "Certain Provisions in the Declaration of Trust--Anti -Takeover Provisions"). This seventy-five percent (75%) shareholder approval requirement is higher than is required under the 1940 Act. In the event that a conversion is approved by the Trustees and the Continuing Trustees as described above, the minimum shareholder vote required under the 1940 Act would be necessary to authorize the conversion. Currently, the 1940 Act would require approval of the holders of a "majority of the outstanding" Common Shares and, if issued, Preferred Shares voting together as a single class, and the holders of a "majority of the outstanding" Preferred Shares voting as a separate class, in order to authorize a conversion.

If the Fund converted to an open-end company, it would be required to redeem all Preferred Shares then outstanding (requiring in turn that it liquidate a portion of its investment portfolio), and the Fund's Common Shares likely would no longer be listed on the New York Stock Exchange. Shareholders of an open-end investment company may require the company to redeem their shares on any business day (except in certain circumstances as authorized by or under the 1940 Act) at their net asset value, less such redemption charge, if any, as might be in

47

effect at the time of redemption. In order to avoid maintaining large cash positions or liquidating favorable investments to meet redemptions, open-end companies typically engage in a continuous offering of their shares. Open-end companies are thus subject to periodic asset in-flows and out-flows that can complicate portfolio management.

The repurchase by the Fund of its shares at prices below net asset value will result in an increase in the net asset value of those shares that remain outstanding. However, there can be no assurance that share repurchases or tenders at or below net asset value will result in the Fund's shares trading at a price equal to their net asset value. Nevertheless, the fact that the Fund's shares may be the subject of repurchase or tender offers at net asset value from time to time, or that the Fund may be converted to an open-end company, may reduce any spread between market price and net asset value that might otherwise exist.

In addition, a purchase by the Fund of its Common Shares will decrease the Fund's total assets which would likely have the effect of increasing the Fund's expense ratio. Any purchase by the Fund of its Common Shares at a time when Preferred Shares are outstanding will increase the leverage applicable to the outstanding Common Shares then remaining. See the Fund's Prospectus under "Risks--Leverage Risk."

Before deciding whether to take any action if the Fund's Common Shares trade below net asset value, the Board of Trustees would consider all relevant factors, including the extent and duration of the discount, the liquidity of the Fund's portfolio, the impact of any action that might be taken on the Fund or its shareholders and market considerations. Based on these considerations, even if the Fund's shares should trade at a discount, the Board of Trustees may determine that, in the interest of the Fund and its shareholders, no action should be taken.

48

TAX MATTERS

Taxation of the Fund. The Fund intends to qualify each year as a regulated investment company under Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code"). In order to qualify for the special tax treatment accorded regulated investment companies and their shareholders, the Fund must, among other things:

(a) derive at least 90% of its gross income from dividends, interest, payments with respect to certain securities loans, and gains from the sale of stock, securities and foreign currencies, or other income (including but not limited to gains from options, futures, or forward contracts) derived with respect to its business of investing in such stock, securities, or currencies;

(b) distribute with respect to each taxable year at least 90% of the sum of its taxable net investment income, its net tax-exempt income, and the excess, if any, of net short-term capital gains over net long-term capital losses for such year; and

(c) diversify its holdings so that, at the end of each fiscal quarter, (i) at least 50% of the market value of the Fund's assets is represented by cash and cash items, U.S. government securities, securities of other regulated investment companies, and other securities limited in respect of any one issuer to a value not greater than 5% of the value of the Fund's total assets and not more than 10% of the outstanding voting securities of such issuer, and (ii) not more than 25% of the value of the Fund's assets is invested in the securities (other than those of the U.S. Government or other regulated investment companies) of any one issuer or of two or more issuers which the Fund controls and which are engaged in the same, similar, or related trades or businesses.

If the Fund qualifies as a regulated investment company that is accorded special tax treatment, the Fund will not be subject to federal income tax on income distributed in a timely manner to its shareholders in the form of dividends (including capital gain dividends).

If the Fund failed to qualify as a regulated investment company accorded special tax treatment in any taxable year, the Fund would be subject to tax on its taxable income at corporate rates, and all distributions from earnings and profits, including any distributions of net tax-exempt income and net long-term capital gains, would be taxable to shareholders as ordinary income. In addition, the Fund could be required to recognize unrealized gains, pay substantial taxes and interest and make substantial distributions before requalifying as a regulated investment company that is accorded special tax treatment.

The Fund may retain for investment its net capital gain. However, if the Fund retains any net capital gain or any investment company taxable income, it will be subject to tax at regular corporate rates on the amount retained. If the Fund retains any net capital gain, it may designate the retained amount as undistributed capital gains in a notice to its shareholders who, if subject to federal income tax on long-term capital gains, (i) will be required to include in income for federal income tax purposes, as long-term capital gain, their share of such undistributed amount, and (ii) will be entitled to credit their proportionate shares of the tax paid by the Fund on such undistributed amount against their federal income tax liabilities, if any, and to claim refunds to

49

the extent the credit exceeds such liabilities. For federal income tax purposes, the tax basis of shares owned by a shareholder of the Fund will be increased by an amount equal under current law to the difference between the amount of undistributed capital gains included in the shareholder's gross income and the tax deemed paid by the shareholder under clause (ii) of the preceding sentence. The Fund intends to distribute at least annually to its shareholders all or substantially all of its net tax-exempt interest and any investment company taxable income and net capital gain.

Treasury regulations permit a regulated investment company, in determining its investment company taxable income and net capital gain, to elect to treat all or part of any net capital loss, any net long-term capital loss or any net foreign currency loss incurred after October 31 as if it had been incurred in the succeeding year.

If the Fund fails to distribute in a calendar year at least an amount equal to the sum of 98% of its ordinary income for such year and 98% of its capital gain net income for the one-year period ending October 31, plus any retained amount from the prior year, the Fund will be subject to a 4% excise tax on the undistributed amounts. A dividend paid to shareholders in January of a year generally is deemed to have been paid by the Fund on December 31 of the preceding year, if the dividend was declared and payable to shareholders of record on a date in October, November or December of that preceding year. The Fund intends generally to make distributions sufficient to avoid imposition of the 4% excise tax.

Fund Distributions. Distributions from the Fund (other than exempt- interest dividends, as discussed below) will be taxable to shareholders as ordinary income to the extent derived from investment income and net short-term capital gains. Distributions of net capital gains (that is, the excess of net gains from the sale of capital assets held more than one year over net losses from the sale of capital assets held for not more than one year) will be taxable to shareholders as such, regardless of how long a shareholder has held the shares in the Fund.

The Fund's expenses attributable to earning tax-exempt income do not reduce its current earnings and profits; therefore, distributions in excess of the sum of the Fund's net tax-exempt and taxable income may be treated as taxable dividends to the extent of the Fund's remaining earnings and profits (which provides the measure of the Fund's dividend-paying capacity for tax purposes). Distributions in excess of the sum of the Fund's net tax-exempt and taxable income could occur, for example, if the Fund's book income exceeded the sum of its net tax-exempt and taxable income. Differences in the Fund's book income and its net tax-exempt and taxable income may arise from certain of the Fund's hedging and investment activities. See "Hedging Transactions" below.

Exempt-interest dividends. The Fund will be qualified to pay exempt- interest dividends to its shareholders only if, at the close of each quarter of the Fund's taxable year, at least 50% of the total value of the Fund's assets consists of obligations the interest on which is exempt from federal income tax under Code Section 103(a). Distributions that the Fund properly designates as exempt-interest dividends are treated as interest excludable from shareholders' gross income for federal income tax purposes but may be taxable for federal alternative minimum tax purposes and for state and local purposes. Because the Fund intends to qualify to pay exempt-interest dividends, the Fund may be limited in its ability to enter into taxable transactions involving

50

forward commitments, repurchase agreements, financial futures and options contracts on financial futures, tax-exempt bond indices and other assets.

The receipt of exempt-interest dividends may affect the portion, if any, of a person's Social Security and Railroad Retirement benefits that will be includable in gross income subject to federal income tax. Up to 85% of Social Security and Railroad Retirement benefits may be included in gross income in cases where the recipient's combined income, consisting of adjusted gross income (with certain adjustments), tax-exempt interest income and one-half of any Social Security and Railroad Retirement benefits, exceeds an adjusted base amount ($34,000 for a single individual and $44,000 for individuals filing a joint return). Shareholders receiving Social Security or Railroad Retirement benefits should consult their tax advisers.

Under the Code, the interest on certain "private activity bonds" issued after August 7, 1986 is treated as a preference item and is (after reduction by applicable expenses) included in federal alternative minimum taxable income. The Fund will furnish to shareholders annually a report indicating the percentage of Fund income treated as a preference item for federal alternative minimum tax ("AMT") purposes. In addition, for corporations, alternative minimum taxable income is increased by a percentage of the excess of an alternative measure of income that includes interest on all tax-exempt securities over the amount otherwise determined to be alternative minimum taxable income. Accordingly, the portion of the Fund's dividends that would otherwise be tax-exempt to the shareholders may cause an investor to be subject to the AMT or may increase the tax liability of an investor who is subject to such tax. As described above, the portfolio manager will normally avoid investments in bonds potentially subjecting individuals to the AMT, which generally includes private activity bonds.

Legislation has been introduced in recent years that would reinstate a deductible tax (the "Environmental Tax") imposed through tax years beginning before 1996 at a rate of 0.12% on a corporation's alternative minimum taxable income (computed without regard to the AMT net operating loss deduction) in excess of $2,000,000. If the Environmental Tax is reinstated, exempt-interest dividends that are included in a corporate shareholder's alternative minimum taxable income may subject corporate shareholders of the Fund to the Environmental Tax.

The Fund designates distributions made to the share classes as consisting of a portion of each type of income distributed by the Fund. The portion of each type of income deemed received by each class of shareholders is equal to the portion of total Fund distributions received by such class. Thus, the Fund will designate dividends paid as exempt-interest dividends in a manner that allocates such dividends between the Preferred and Common Shareholders in proportion to the total dividends paid to each class during or with respect to the taxable year, or otherwise as required by applicable law. Long-term capital gain distributions and other income subject to regular federal income tax will similarly be allocated between the two (or more) classes. No dividend that the Fund pays will be increased to compensate for the fact that it may be subject to state and local taxes.

Dividend and capital gains distributions will be taxable as described above whether received in cash or in shares. A shareholder whose distributions are reinvested in shares will be treated as having received a dividend equal to the fair market value of the new shares issued to

51

the shareholder, or the amount of cash allocated to the shareholder for the purchase of shares on its behalf.

Part or all of the interest on indebtedness, if any, incurred or continued by a shareholder to purchase or carry shares of the Fund paying exempt-interest dividends is not deductible. The portion of interest that is not deductible is equal to the total interest paid or accrued on the indebtedness, multiplied by the percentage of the Fund's total distributions (not including distributions from net long-term capital gains) paid to the shareholder that are exempt- interest dividends. Under rules used by the Internal Revenue Service (the "Service") to determine when borrowed funds are considered used for the purpose of purchasing or carrying particular assets, the purchase of shares may be considered to have been made with borrowed funds even though such funds are not directly traceable to the purchase of shares.

Under a published position of the Service, a shareholder's interest deduction generally will not be disallowed if the average adjusted basis of the shareholder's tax-exempt obligations (including shares of preferred stock) does not exceed two percent of the average adjusted basis of the shareholder's trade or business assets (in the case of most corporations) or portfolio investments (in the case of individuals). Legislation has been introduced in recent years that would further limit or repeal this two-percent de minimis exception, thus reducing the total after-tax yield of a shareholder.

In general, exempt-interest dividends, if any, attributable to interest received on certain private activity obligations and certain industrial development bonds will not be tax-exempt to any shareholders who are "substantial users," within the meaning of Section 147(a) of the Code, of the facilities financed by such obligations or bonds or who are "related persons" of such substantial users.

The Fund will inform investors within 60 days of the Fund's fiscal year-end of the percentage of its income distributions designated as tax-exempt. The percentage is applied uniformly to all distributions made during the year. The percentage of income designated as tax-exempt for any particular distribution may be substantially different from the percentage of the Fund's income that was tax-exempt during the period covered by the distribution.

Hedging Transactions. If the Fund engages in hedging transactions, including hedging transactions in options, futures contracts, and straddles, or other similar transactions, it will be subject to special tax rules (including constructive sale, mark-to-market, straddle, wash sale, and short sale rules), the effect of which may be to accelerate income to the Fund, defer losses to the Fund, cause adjustments in the holding periods of the Fund's securities, convert long-term capital gains into short-term capital gains or convert short-term capital losses into long-term capital losses. These rules could therefore affect the amount, timing and character of distributions to shareholders. Income earned as a result of the Fund's hedging activities will not be eligible to be treated as exempt-interest dividends when distributed to shareholders. The Fund will endeavor to make any available elections pertaining to such transactions in a manner believed to be in the best interests of the Fund.

52

Certain of the Fund's hedging activities are likely to produce a difference between its book income and the sum of its net tax-exempt and taxable income. If the Fund's book income exceeds its net tax-exempt income, the distribution (if any) of such excess will be treated as (i) a taxable dividend to the extent of the Fund's remaining earnings and profits (including earnings and profits arising from tax-exempt income), (ii) thereafter as a return of capital to the extent of the recipient's basis in the shares, and (iii) thereafter as gain from the sale or exchange of a capital asset. If the Fund's book income is less than its taxable income, the Fund could be required to make distributions exceeding book income to qualify as a regulated investment company that is accorded special tax treatment.

Return of Capital Distributions. If the Fund makes a distribution to you in excess of its current and accumulated earnings and profits in any taxable year, the excess distribution will be treated as a return of capital to the extent of your tax basis in your shares, and thereafter as capital gain. A return of capital is not taxable, but it reduces your tax basis in your shares, thus reducing any loss or increasing any gain on a subsequent taxable disposition by you of your shares.

Dividends and distributions on the Fund's shares are generally subject to federal income tax as described herein to the extent they do not exceed the Fund's realized income and gains, even though such dividends and distributions may economically represent a return of a particular shareholder's investment. Such distributions are likely to occur in respect of shares purchased at a time when the Fund's net asset value reflects gains that are either unrealized, or realized but not distributed. Such realized gains may be required to be distributed even when the Fund's net asset value also reflects unrealized losses. Distributions are taxable to a shareholder even if they are paid from income or gains earned by the Fund prior to the shareholder's investment (and thus included in the price paid by the shareholders).

Securities Issued or Purchased at a Discount. The Fund's investment in securities issued at a discount and certain other obligations will (and investments in securities purchased at a discount may) require the Fund to accrue and distribute income not yet received. In order to generate sufficient cash to make the requisite distributions, the Fund may be required to sell securities in its portfolio that it otherwise would have continued to hold.

Capital Loss Carryover. Distributions from capital gains are generally made after applying any available capital loss carryovers.

Sale or Redemption of Shares. The sale, exchange or redemption of Fund shares may give rise to a gain or loss. In general, any gain or loss realized upon a taxable disposition of shares will be treated as long-term capital gain or loss if the shares have been held for more than 12 months. Otherwise the gain or loss on the taxable disposition of Fund shares will be treated as short-term capital gain or loss. However, if a shareholder sells shares at a loss within six months of purchase, any loss will be disallowed for federal income tax purposes to the extent of any exempt-interest dividends received on such shares. In addition, any loss realized upon a taxable disposition of shares held for six months or less but not disallowed as provided in the preceding sentence will be treated as long-term, rather than short-term, to the extent of any long-term capital gain distributions received by the shareholder with respect to the shares. All or a portion of any loss realized upon a taxable disposition of Fund shares will be disallowed if other shares

53

of the Fund are purchased within 30 days before or after the disposition. In such a case, the basis of the newly purchased shares will be adjusted to reflect the disallowed loss.

From time to time the Fund may make a tender offer for its Common Shares. It is expected that the terms of any such offer will require a tendering shareholder to tender all Common Shares and dispose of all Preferred Shares, held, or considered under certain attribution rules of the Code to be held, by such shareholder. Shareholders who tender all Common Shares and dispose of all Preferred Shares held, or considered to be held, by them will be treated as having sold their shares and generally will realize a capital gain or loss. If a shareholder tenders fewer than all of its Common Shares, but retains a substantial portion of its Preferred Shares, such shareholder may be treated as having received a taxable dividend upon the tender of its Common Shares. In such a case, there is a remote risk that non-tendering shareholders will be treated as having received taxable distributions from the Fund. Likewise, if the Fund redeems some but not all of the Preferred Shares held by a holder of Preferred Shares ("Preferred Shareholder") and such shareholder is treated as having received a taxable dividend upon such redemption, there is a remote risk that Common Shareholders and non-redeeming Preferred Shareholders will be treated as having received taxable distributions from the Fund. To the extent that the Fund recognizes net gains on the liquidation of portfolio securities to meet such tenders of Common Shares, the Fund will be required to make additional distributions to its shareholders.

Backup Withholding. The Fund generally is required to withhold and remit to the U.S. Treasury a percentage of the taxable dividends and other distributions paid to any individual shareholder who fails to properly furnish the Fund with a correct taxpayer identification number (TIN), who has under- reported dividend or interest income, or who fails to certify to the Fund that he or she is not subject to such withholding. Pursuant to recently enacted tax legislation, the backup withholding tax rate will be (i) 30.5% for amounts paid after August 6, 2001 through the end of 2001, (ii) 30% for amounts paid during 2002 and 2003, (iii) 29% for amounts paid during 2004 and 2005, and (iv) 28% for amounts paid during 2006 through 2010. This legislation will expire and the backup withholding rate will be 31% for amounts paid after December 31, 2010, unless Congress enacts tax legislation providing otherwise.

The Service recently revised its regulations affecting the application to foreign investors of the back-up withholding and withholding tax rules described above. The new regulations are generally effective for payments made after December 31, 2000. In some circumstances, the new rules increase the certification and filing requirements imposed on foreign investors in order to qualify for exemption from the back-up withholding tax rates and for reduced withholding tax rates under income tax treaties. Foreign investors in the Fund should consult their tax advisers with respect to the potential application of these new regulations.

General. The federal income tax discussion set forth above is for general information only. Prospective investors should consult their tax advisers regarding the specific federal tax consequences of purchasing, holding, and disposing of shares of the Fund, as well as the effects of state, local and foreign tax law and any proposed tax law changes.

PERFORMANCE RELATED AND COMPARATIVE INFORMATION

The Fund may be a suitable investment for a shareholder who is thinking of adding bond investments to his portfolio to balance the appreciated stocks that the shareholder is holding. Although the Fund currently intends to avoid investments generating income potentially

54

subjecting individuals to the federal alternative minimum tax, it may not be successful in doing so. Therefore, Common Shares may not be a suitable investment for investors who are subject to the federal alternative minimum tax or who would become subject to such tax by purchasing Common Shares. The suitability of an investment in Common Shares will depend upon a comparison of the after-tax yield likely to be provided from the Fund with that from comparable tax-exempt investments (including those not subject to the alternative minimum tax), and from comparable fully taxable investments, in light of each such investor's tax position.

The Fund may quote certain performance-related information and may compare certain aspects of its portfolio and structure to other substantially similar closed-end funds as categorized by Lipper, Inc. ("Lipper"), Morningstar Inc. or other independent services. Comparison of the Fund to an alternative investment should be made with consideration of differences in features and expected performance. The Fund may obtain data from sources or reporting services, such as Bloomberg Financial ("Bloomberg") and Lipper, that the Fund believes to be generally accurate.

The Fund, in its advertisements, may refer to pending legislation from time to time and the possible impact of such legislation on investors, investment strategy and related matters. This would include any tax proposals and their effect on marginal tax rates and tax-equivalent yields. At any time in the future, yields and total return may be higher or lower than past yields and there can be no assurance that any historical results will continue.

Past performance is not indicative of future results. At the time Common Shareholders sell their shares, they may be worth more or less than their original investment.

See Appendix B for additional performance related and comparative information.

CUSTODIAN, TRANSFER AGENT AND DIVIDEND DISBURSING AGENT

State Street Bank and Trust Company, 225 Franklin Street, Boston, Massachusetts 02110, serves as custodian for assets of the Fund. The custodian performs custodial and fund accounting services.

PFPC Inc., 400 Bellevue Parkway, Wilmington, Delaware 19809, serves as the Fund's transfer agent, registrar, dividend disbursing agent and shareholder servicing agent, as well as agent for the Fund's dividend reinvestment plan.

INDEPENDENT ACCOUNTANTS

PricewaterhouseCoopers LLP, 1177 Avenue of the Americas, New York, New York 10036, serves as independent accountants for the Fund. PricewaterhouseCoopers LLP provides audit services, tax return preparation and assistance and consultation in connection with review of SEC filings to the Fund.

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COUNSEL

Ropes & Gray, One International Place, Boston, MA 02110, passes upon certain legal matters in connection with shares offered by the Fund, and also acts as counsel to the Fund.

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REGISTRATION STATEMENT

A Registration Statement on Form N-2, including any amendments thereto, relating to the shares of the Fund offered hereby, has been filed by the Fund with the SEC (the "SEC"), Washington, D.C. The Fund's Prospectus and this Statement of Additional Information do not contain all of the information set forth in the Registration Statement, including any exhibits and schedules thereto. For further information with respect to the Fund and the shares offered or to be offered hereby, reference is made to the Fund's Registration Statement. Statements contained in the Fund's Prospectus and this Statement of Additional Information as to the contents of any contract or other document referred to are not necessarily complete and in each instance reference is made to the copy of such contract or other document filed as an exhibit to the Registration Statement, each such statement being qualified in all respects by such reference. Copies of the Registration Statement may be inspected without charge at the SEC's principal office in Washington, D.C., and copies of all or any part thereof may be obtained from the SEC upon the payment of certain fees prescribed by the SEC.

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REPORT OF INDEPENDENT ACCOUNTANTS

To the Shareholder and Board of Trustees of PIMCO Municipal Income Fund

In our opinion, the accompanying statement of assets and liabilities and the related statement of operations present fairly, all material respects, the financial position of PIMCO Municipal Income Fund ( the "Fund") at June 20, 2001 and the results of its operations for the one day then ended in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of the Fund's management; our responsibility is to express an opinion on these financial statements based on our audit. We conducted our audit of these financial statements in accordance with auditing standards generally accepted in the United States of America, which require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion.

PricewaterhouseCoopers LLP
New York, New York
June 21, 2001

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FINANCIAL STATEMENTS

PIMCO Municipal Income Fund
STATEMENT OF ASSETS AND LIABILITIES
June 20, 2001

Assets:
           Cash                                                                                                          $100,005
           Receivable from Investment Manager                                                                              18,300

           Total Assets                                                                                                   118,305

Liabilities:
           Accrued                                                                                                         18,300
           Organizational Expense

           Total                                                                                                           18,300
           Liabilities

Net Assets (6,667 shares of no par value shares of beneficial
          interest issued and outstanding; unlimited shares authorized)                                                  $100,005


Net asset value per share                                                                                                  $15.00

STATEMENT OF OPERATIONS
ONE DAY ENDED JUNE 20, 2001

Investment Income                                                                                                              $0

Organizational Expenses                                                                                                    18,300
Less: Reimbursement from Investment Manager                                                                               (18,300)
Net Expenses                                                                                                                    0

Net Investment Income                                                                                                          $0

NOTES:

1. ORGANIZATION

PIMCO Municipal Income Fund (the "Fund") was organized as a Massachusetts business trust on May 9, 2001.The Fund has had no operations to date other than matters relating to its organization and registration as a diversified, closed- end management investment company under the Investment Company Act of 1940, as amended, and the sale and issuance to PIMCO Advisors L.P. (the"Investment Manager"), an indirect wholly-owned subsidiary of Allianz AG, of 6,667 shares of beneficial interest at an aggregate purchase price of $100,005. The Investment Manager has agreed to reimburse all organizational costs if the public offering is not completed and, if the offering is completed, will pay all organizational and offering expenses (other than the sales load) that exceed $0.03 per share.

2. ACCOUNTING POLICIES

The preparation of the financial statements in accordance with accounting principles generally accepted in the United States of America require management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from these estimates.

3. INVESTMENT MANAGER AND RELATED PARTIES

The Fund has entered into an Investment Management Agreement (the "Agreement") with the Investment Manager to serve as investment manager to the Fund. Pursuant to the Agreement, the Fund pays the Investment Manager an annual management fee, payable monthly, at the annual rate of 0.65% of the Fund's average daily net assets, inclusive of net assets attributable to any preferred shares that may be issued. The Investment Manager has retained its affiliate, Pacific Investment Management Co. LLC ("PIMCO"), to manage the Fund's investments. The Investment Manager (not the Fund) will pay a portion of the fees it receives as Investment Manager to PIMCO in return for its services, at the maximum annual rate of 0.37% of the Fund's average daily net assets, inclusive of any net assets attributable to any preferred shares issued.

In order to reduce Fund expenses, the Investment Manager has contractually agreed to reimburse the Fund for fees and expenses at the annual rate of 0.20% of the Fund's average daily net assets from the commencement of operations through June 30, 2006, and for a declining amount thereafter through June 30, 2009.

4. FEDERAL INCOME TAXES

The Fund intends to comply with the requirements of the Internal Revenue Code of 1986, as amended, applicable to regulated investment companies. Accordingly, no provision for U.S. federal income taxes is required. In addition, by distributing substantially all of its ordinary income and long-term capital gains, if any, during each calendar year, the Fund intends not to be subject to U.S. federal excise tax.

5. CONTINGENT RECEIVABLE FROM INVESTMENT MANAGER In the event that the public offering of the Fund does not occur, the Investment Manager has agreed to reimburse the Fund for all organizational expenses.

59

APPENDIX A

Ratings of Investments

Standard & Poor's, a division of The McGraw-Hill Companies, Inc.--A brief description of the applicable Standard & Poor's ("S&P") rating symbols and their meanings (as published by S&P) follows:

An S&P issue credit rating is a current opinion of the creditworthiness of an obligor with respect to a specific financial obligation, a specific class of financial obligations, or a specific financial program. It takes into consideration the creditworthiness of guarantors, insurers, or other forms of credit enhancement on the obligation. The issue credit rating is not a recommendation to purchase, sell, or hold a financial obligation, inasmuch as it does not comment as to market price or suitability for a particular investor.

Issue credit ratings are based on current information furnished by the obligors or obtained by S&P from other sources it considers reliable. S&P does not perform an audit in connection with any credit rating and may, on occasion, rely on unaudited financial information. Credit ratings may be changed, suspended, or withdrawn as a result of changes in, or unavailability of, such information, or based on other circumstances.

Issue credit ratings can be either long term or short term. Short-term ratings are generally assigned to those obligations considered short term in the relevant market. In the U.S., for example, that means obligations with an original maturity of no more than 365 days - including commercial paper. Short- term ratings are also used to indicate the creditworthiness of an obligor with respect to put features on long-term obligations. The result is a dual rating, in which the short-term ratings address the put feature, in addition to the usual long-term rating. Medium-term notes are assigned long-term ratings.

Long-term Issue Credit Ratings

Issue credit ratings are based in varying degrees, on the following considerations:

1. Likelihood of payment - capacity and willingness of the obligor to meet its financial commitment on an obligation in accordance with the terms of the obligation;

2. Nature of and provisions of the obligation; and

3. Protection afforded by, and relative position of, the obligation in the event of bankruptcy, reorganization, or other arrangement under the laws of bankruptcy and other laws affecting creditors' rights.

The issue ratings definitions are expressed in terms of default risk. As such, they pertain to senior obligations of an entity. Junior obligations are typically rated lower than senior obligations, to reflect the lower priority in bankruptcy, as noted above.

A-1

AAA

An obligation rated 'AAA' has the highest rating assigned by S&P. The obligor's capacity to meet its financial commitment on the obligation is extremely strong.

AA

An obligation rated 'AA' differs from the highest-rated obligations only in small degree. The obligor's capacity to meet its financial commitment on the obligation is very strong.

A An obligation rated 'A' is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher- rated categories. However, the obligor's capacity to meet it financial commitment on the obligation is still strong.

BBB

An obligation rated 'BBB' exhibits adequate protection parameters. However, adverse economic conditions or changing circumstances are more likely to lead to a weakened capacity of the obligor to meet its financial commitment on the obligation.

BB, B, CCC, CC, and C

Obligations rated 'BB', 'B', 'CCC', 'CC', and 'C' are regarded as having significant speculative characteristics. 'BB' indicates the least degree of speculation and 'C' the highest. While such obligations will likely have some quality and protective characteristics, these may be outweighed by large uncertainties or major exposures to adverse conditions.

BB

An obligation rated 'BB' is less vulnerable to nonpayment than other speculative issues. However, it faces major ongoing uncertainties or exposure to adverse business, financial, or economic conditions, which could lead to the obligor's inadequate capacity to meet its financial commitment on the obligation.

B An obligation rated 'B' is more vulnerable to nonpayment than obligations rated 'BB', but the obligor currently has the capacity to meet its financial commitment on the obligation. Adverse business, financial, or economic conditions will likely impair the obligor's capacity or willingness to meet its financial commitment on the obligation.

CCC

An obligation rated 'CCC' is currently vulnerable to nonpayment and is dependent upon favorable business, financial, and economic conditions for the obligor to meet its financial commitment on the obligation. In the event of adverse business, financial, or economic

A-2

conditions, the obligor is not likely to have the capacity to meet its financial commitment on the obligation.

CC

An obligation rated 'CC' is currently highly vulnerable to nonpayment.

C The 'C' rating may be used to cover a situation where a bankruptcy petition has been filed or similar action has been taken, but payments on this obligation are being continued.

D An obligation rated 'D' is in payment default. The 'D' rating category is used when payments on an obligation are not made on the date due even if the applicable grace period has not expired, unless S&P believes that such payments will be made during such grace period. The `D' rating also will be used upon the filing of a bankruptcy petition or the taking of a similar action if payments on an obligation are jeopardized.

Plus (+) or minus (-) The ratings from 'AA' to 'CCC' may be modified by the addition of a plus or minus sign to show relative standing within the major rating categories.

c The 'c' subscript is used to provide additional information to investors that the bank may terminate its obligation to purchase tendered bonds if the long- term credit rating of the issuer is below an investment-grade level and/or the issuer's bonds are deemed taxable.

p The letter 'p' indicates that the rating is provisional. A provisional rating assumes the successful completion of the project financed by the debt being rated and indicates that payment of debt service requirements is largely or entirely dependent upon the successful, timely completion of the project. This rating, however, while addressing credit quality subsequent to completion of the project, makes no comment on the likelihood of or the risk of default upon failure of such completion. The investor should exercise his own judgment with respect to such likelihood and risk.

* Continuance of the ratings is contingent upon S&P's receipt of an executed copy of the escrow agreement or closing documentation confirming investments and cash flows.

r The 'r' highlights derivative, hybrid, and certain other obligations that S&P believes may experience high volatility or high variability in expected returns as a result of noncredit risks. Examples of such obligations are securities with principal or interest return indexed to equities, commodities, or currencies; certain swaps and options; and interest-only and principal-only mortgage securities. The absence of an `r' symbol should not be taken as an indication that an obligation will exhibit no volatility or variability in total return.

N.R. Not rated.

A-3

Debt obligations of issuers outside the United States and its territories are rated on the same basis as domestic corporate and municipal issues. The ratings measure the creditworthiness of the obligor but do not take into account currency exchange and related uncertainties.

Bond Investment Quality Standards Under present commercial bank regulations issued by the Comptroller of the Currency, bonds rated in the top four categories ('AAA', 'AA', 'BBB', commonly known as investment-grade ratings) generally are regarded as eligible for bank investment. Also, the laws of various states governing legal investments impose certain rating or other standards for obligations eligible for investment by savings banks, trust companies, insurance companies, and fiduciaries in general.

Short-Term Issue Credit Ratings

An S&P note ratings reflects the liquidity factors and market access risks unique to notes. Notes due in three years or less will likely receive a note rating. Notes maturing beyond three years will most likely receive a long-term debt rating. The following criteria will be used in making that assessment:

. Amortization schedule -- the larger the final maturity relative to other maturities, the more likely it will be treated as a note; and

. Source of payment -- the more dependent the issue is on the market for its refinancing, the more likely it will be treated as a note.

Note rating symbols are as follows:

SP-1 Strong capacity to pay principal and interest. An issue determined to possess a very strong capacity to pay debt service is given a plus (+) designation.

SP-2 Satisfactory capacity to pay principal and interest, with some vulnerability to adverse financial and economic changes over the term of the notes.

SP-3 Speculative capacity to pay principal and interest.

A note rating is not a recommendation to purchase, sell, or hold a security inasmuch as it does not comment as to market price or suitability for a particular investor. The ratings are based on current information furnished to S&P by the issuer or obtained by S&P from other sources it considers reliable. S&P does not perform an audit in connection with any rating and may, on occasion, rely on unaudited financial information. The ratings may be changed, suspended, or withdrawn as a result of changes in or unavailability of such information or based on other circumstances.

Commercial Paper

An S&P commercial paper rating is a current assessment of the likelihood of timely payment of debt having an original maturity of no more than 365 days.

A-4

Ratings are graded into several categories, ranging from 'A-1' for the highest quality obligations to 'D' for the lowest. These categories are as follows:

A-1  A short-term obligation rated 'A-1' is rated in the highest category by
     S&P.  The obligor's capacity to meet its financial commitment on the
     obligation is strong.  Within this category, certain obligations are
     designated with a plus sign (+).  This indicates that the obligor's
     capacity to meet its financial commitment on these obligations is extremely
     strong.

A-2  A short-term obligation rated 'A-2' is somewhat more susceptible to the
     adverse effects of changes in circumstances and economic conditions than
     obligations in higher rating categories.  However, the obligor's capacity
     to meet its financial commitment on the obligation is satisfactory.

A-3  A short-term obligation rated 'A-3' exhibits adequate protection
     parameters.  However, adverse economic conditions or changing circumstances
     are more likely to lead to a weakened capacity of the obligor to meet its
     financial commitment on the obligation.

B    A short-term obligation rated 'B' is regarded as having significant
     speculative characteristics.  The obligor currently has the capacity to
     meet its financial commitment on the obligation; however, it faces major
     ongoing uncertainties which could lead to the obligor's inadequate capacity
     to meet its financial commitment on the obligation.

C    A short-term obligation rated 'C' is currently vulnerable to nonpayment and
     is dependent upon favorable business, financial, and economic conditions
     for the obligor to meet its financial commitment on the obligation.

D    A short-term obligation rated 'D' is in payment default.  The 'D' rating
     category is used when payments on an obligation are not made on the date
     due even if the applicable grace period has not expired, unless S&P
     believes that such payments will be made during such grace period.  The `D'
     rating also will be used upon the filing of a bankruptcy petition or the
     taking of a similar action if payments on an obligation are
     jeopardized.

A commercial rating is not a recommendation to purchase, sell, or hold a security inasmuch as it does not comment as to market price or suitability for a particular investor. The ratings are based on current information furnished to S&P by the issuer or obtained by S&P from other sources it considers reliable. S&P does not perform an audit in connection with any rating and may, on occasion, rely on unaudited financial information. The ratings may be changed, suspended, or withdrawn as a result of changes in or unavailability of such information or based on other circumstances.

Moody's Investors Service, Inc.

A brief description of the applicable Moody's Investors Service, Inc. ("Moody's") rating symbols and their meanings (as published by Moody's) follows:

A-5

Municipal Bonds

Aaa  Bonds which are rated 'Aaa' are judged to be of the best quality.  They
     carry the smallest degree of investment risk and are generally referred to
     as "gilt edged." Interest payments are protected by a large or by an
     exceptionally stable margin and principal is secure.  While the various
     protective elements are likely to change, such changes as can be visualized
     are most unlikely to impair the fundamentally strong position of such
     issues.

Aa   Bonds which are rated 'Aa' are judged to be of high quality by all
     standards.  Together with the 'Aaa' group they comprise what are generally
     known as high grade bonds.  They are rated lower than the best bonds
     because margins of protection may not be as large as in 'Aaa' securities or
     fluctuation of protective elements may be of greater amplitude or there may
     be other elements present which make the long-term risks appear somewhat
     larger than in 'Aaa' securities.

A    Bonds which are rated 'A' possess many favorable investment attributes and
     are to be considered as upper medium grade obligations.  Factors giving
     security to principal and interest are considered adequate, but elements
     may be present which suggest a susceptibility to impairment sometime in the
     future.

Baa  Bonds which are rated 'Baa' are considered as medium grade obligations,
     i.e., they are neither highly protected nor poorly secured.  Interest
     payments and principal security appear adequate for the present but certain
     protective elements may be lacking or may be characteristically unreliable
     over any great length of time.  Such bonds lack outstanding investment
     characteristics and in fact have speculative characteristics as well.

Ba   Bonds which are rated 'Ba' are judged to have speculative elements; their
     future cannot be considered as well assured.  Often the protection of
     interest and principal payments may be very moderate and thereby not well
     safeguarded during both good and bad times over the future.  Uncertainty of
     position characterizes bonds in this class.

B    Bonds which are rated 'B' generally lack characteristics of the desirable
     investment.  Assurance of interest and principal payments or of maintenance
     of other terms of the contract over any long period of time may be small.

Caa  Bonds which are rated 'Caa' are of poor standing.  Such issues may be in
     default or there may be present elements of danger with respect to
     principal or interest.

Ca   Bonds which are rated 'Ca' represent obligations which are speculative in a
     high degree.  Such issues are often in default or have other marked
     shortcomings.

C    Bonds which are rated 'C' are the lowest rated class of bonds, and issues
     so rated can be regarded as having extremely poor prospects of ever
     attaining any real investment standing.

Issues that are secured by escrowed funds held in trust, reinvested in direct, non-callable U.S. government obligations or non-callable obligations unconditionally guaranteed by the U.S.

A-6

Government or Resolution Funding Corporation are identified with a # (hatchmark) symbol, e.g., #Aaa.

Con. (...):    Bonds for which the security depends upon the completion of some
               act or the fulfillment of some condition are rated conditionally.
               These are bonds secured by (a) earnings of projects under
               construction, (b) earnings of projects unseasoned in operation
               experience, (c) rentals which begin when facilities are
               completed, or (d) payments to which some other limiting condition
               attaches. The parenthetical rating denotes probable credit
               stature upon completion of construction or elimination of the
               basis of the condition.

Moody's applies numerical modifiers 1, 2 and 3 in each generic rating classification from Aa through Caa. The modifier 1 indicates that the obligation ranks in the higher end of its generic rating category; the modifier 2 indicates a mid-range ranking; and the modifier 3 indicates a ranking in the lower end of that generic rating category.

Short-Term Loans
----------------

MIG 1/VMIG 1        This designation denotes superior credit quality. Excellent
                    protection is afforded by established cash flows, highly
                    reliable liquidity support, or demonstrated broad-based
                    access to the market for refinancing.

MIG 2/VMIG 2        This designation denotes strong credit quality. Margins of
                    protection are ample, although not as large as in the
                    preceding group.

MIG 3/VMIG 3        This designation denotes acceptable credit quality.
                    Liquidity and cash-flow protection may be narrow, and market
                    access for refinancing is likely to be less well-
                    established.

SG                  This designation denotes speculative-grade credit quality.
                    Debt instruments in this category may lack sufficient
                    margins of protection.

Commercial Paper

Issuers rated Prime-1 (or related supporting institutions) have a superior ability for repayment of senior short-term debt obligations. Prime-1 repayment ability will normally be evidenced by the following characteristics:

-- Leading market positions in well-established industries.

-- High rates of return on funds employed.

-- Conservative capitalization structures with moderate reliance on debt and ample asset protection.

-- Broad margins in earnings coverage of fixed financial charges and high internal cash generation.

A-7

-- Well-established access to a range of financial markets and assured sources of alternate liquidity.

Issuers rated Prime-2 (or related supporting institutions) have a strong ability for repayment of senior short-term debt obligations. This will normally be evidenced by many of the characteristics cited above but to a lesser degree. Earnings trends and coverage ratios, while sound, will be more subject to variation. Capitalization characteristics, while still appropriate, may be more affected by external conditions. Ample alternate liquidity is maintained.

Issuers rated Prime-3 (or related supporting institutions) have an acceptable ability for repayment of senior short-term debt obligations. The effect of industry characteristics and market composition may be more pronounced. Variability in earnings and profitability may result in changes in the level of debt protection measurements and the requirement for relatively high financial leverage. Adequate alternate liquidity is maintained.

Issuers rated Not Prime do not fall within any of the Prime rating categories.

Fitch IBCA, Inc.

A brief description of the applicable Fitch IBCA, Inc. ("Fitch") ratings symbols and meanings (as published by Fitch) follows:

Long-Term Credit Ratings

Investment Grade

AAA

Highest credit quality. 'AAA' ratings denote the lowest expectation of credit risk. They are assigned only in case of exceptionally strong capacity for timely payment of financial commitments. This capacity is highly unlikely to be adversely affected by foreseeable events.

AA

Very high credit quality. 'AA' ratings denote a very low expectation of credit risk. They indicate very strong capacity for timely payment of financial commitments. This capacity is not significantly vulnerable to foreseeable events.

A High credit quality. 'A' ratings denote a low expectation of credit risk. The capacity for timely payment of financial commitments is considered strong. This capacity may, nevertheless, be more vulnerable to changes in circumstances or in economic conditions than is the case for higher ratings.

A-8

BBB

Good credit quality. 'BBB' ratings indicate that there is currently a low expectation of credit risk. The capacity for timely payment of financial commitments is considered adequate, but adverse changes in circumstances and in economic conditions are more likely to impair this capacity. This is the lowest investment-grade category.

Speculative Grade

BB

Speculative. 'BB' ratings indicate that there is a possibility of credit risk developing, particularly as the result of adverse economic change over time; however, business or financial alternatives may be available to allow financial commitments to be met. Securities rated in this category are not investment grade.

B Highly speculative. 'B' ratings indicate that significant credit risk is present, but a limited margin of safety remains. Financial commitments are currently being met; however, capacity for continued payment is contingent upon a sustained, favorable business and economic environment.

CCC, CC, C

High default risk. Default is a real possibility. Capacity for meeting financial commitments is solely reliant upon sustained, favorable business or economic developments. A 'CC' rating indicates that default of some kind appears probable. 'C' ratings signal imminent default.

DDD, DD, D

Default. The ratings of obligations in this category are based on their prospects for achieving partial or full recovery in a reorganization or liquidation of the obligor. While expected recovery values are highly speculative and cannot be estimated with any precision, the following serve as general guidelines. 'DDD' obligations have the highest potential for recovery, around 90%-100% of outstanding amounts and accrued interest. 'DD' indicates potential recoveries in the range of 50%-90%, and 'D' the lowest recovery potential, i.e., below 50%. Entities rated in this category have defaulted on some or all of their obligations. Entities rated 'DDD' have the highest prospect for resumption of performance or continued operation with or without a formal reorganization process. Entities rated 'DD' and 'D' are generally undergoing a formal reorganization or liquidation process; those rated 'DD' are likely to satisfy a higher portion of their outstanding obligations, while entities rated 'D' have a poor prospect for repaying all obligations.

A-9

Short-Term Credit Ratings

A short-term rating has a time horizon of less than 12 months for most obligations, or up to three years for U.S. public finance securities, and thus places greater emphasis on the liquidity necessary to meet financial commitments in a timely manner.

F1 Highest credit quality . Indicates the strongest capacity for timely payment of financial commitments; may have an added "+" to denote any exceptionally strong credit feature.

F2 Good credit quality. A satisfactory capacity for timely payment of financial commitments, but the margin of safety is not as great as in the case of the higher ratings.

F3 Fair credit quality. The capacity for timely payment of financial commitments is adequate; however, near-term adverse changes could result in a reduction to non-investment grade.

B Speculative. Minimal capacity for timely payment of financial commitments, plus vulnerability to near-term adverse changes in financial and economic conditions.

C High default risk. Default is a real possibility. Capacity for meeting financial commitments is solely reliant upon a sustained, favorable business and economic environment.

D Default. Denotes actual or imminent payment default.

"+" or "-" may be appended to a rating to denote relative status within major rating categories. Such suffixes are not added to the 'AAA' long-term rating category, to categories below 'CCC', or to short-term ratings other than 'F1'.

'NR' indicates that Fitch does not rate the issuer or issue in question.

'Withdrawn': A rating is withdrawn when Fitch deems the amount of information available to be inadequate for rating purposes, or when an obligation matures, is called, or refinanced.

Rating Watch: Ratings are placed on RatingWatch to notify investors that there is a reasonable probability of a rating change and the likely direction of such change. These are designated as "Positive", indicating a potential upgrade, "Negative", for a potential downgrade, or "Evolving", if ratings may be raised, lowered or maintained. Rating Watch is typically resolved over a relatively short period.

A Rating Outlook indicates the direction a rating is likely to move over a one to two year period. Outlooks may be positive, stable, or negative. A positive or negative Rating Outlook does not imply a rating change is inevitable. Similarly, companies whose outlooks are `stable' could be downgraded before an outlook moves to positive or negative if circumstances warrant such an action. Occasionally, Fitch may be unable to identify the fundamental trend. In these cases, the Rating Outlook may be described as evolving.

A-10

APPENDIX B

PERFORMANCE RELATED AND COMPARATIVE AND OTHER INFORMATION

From time to time, the Fund, PIMCO Advisors and/or PIMCO may report to shareholders or to the public in advertisements concerning the performance of PIMCO Advisors and/or PIMCO as adviser to clients other than the Fund, or on the comparative performance or standing of PIMCO Advisors and/or PIMCO in relation to other money managers. PIMCO Advisors and/or PIMCO also may provide current or prospective private account clients, in connection with standardized performance information for the Fund, performance information for the Fund gross of fees and expenses for the purpose of assisting such clients in evaluating similar performance information provided by other investment managers or institutions. Comparative information may be complied or provided by independent ratings services or by news organizations. Any performance information, whether related to the Fund, PIMCO Advisors or PIMCO, should be considered in light of the Fund's investment objective and policies, characteristics and quality of the Fund, and the market conditions during the time period indicated, and should not be considered to be representative of what may be achieved in the future. Performance information for the Fund may be compared to various unmanaged indexes.

Organized in 1971, PIMCO is one of the nation's leading bond managers, providing investment management and advisory services to private accounts of institutional and individual clients and to mutual funds. As of the date of this Statement of Additional Information, PIMCO is one of America's largest active bond managers, with over $220 billion in assets under management and a client list with over 1,600 institutional clients, including 63 of the largest 100 corporations in America. PIMCO's bond team of 129 bond professionals is headed by PIMCO founder and Chief Investment Officer Bill Gross, Morningstar's Fixed Income Manager of the Year for 1998 and 2000.

PIMCO uses a distinctive total return approach, which focuses on income and uses proprietary analyses to preserve and enhance value. PIMCO has employed its distinctive total return approach to bond investing since the firm's inception in 1971, and has applied it to municipal bond investments since 1991. A fundamental aspect of this approach is the use of multiple strategies to enhance value and reduce portfolio risk, rather than relying on a limited set of strategies for success. The Fund is positioned to draw on PIMCO's broad-ranging fixed-income expertise and extensive resources.

PIMCO's approach begins with the formulation of the firm's long-term ("secular") outlook at its annual firm-wide Secular Forum - a three-day event bringing PIMCO's team of bond experts together with some of the country's top thinkers in economics, demographics and other key disciplines. Quarterly meetings are then held to discuss how this outlook applies to the short term (3 to 12 months) and to forecast global interest rates, economic growth and inflation. Taken together, PIMCO's long-term outlook and short-term forecast help set the basic portfolio parameters. A variety of security-specific strategies, including risk-adjusted yield and credit analyses, are then applied by the portfolio manager to create value on an after-tax basis. The portfolio manager will seek to preserve and enhance the value of the Fund's holdings relative to the municipal bond market generally using in-house analytical models that test and evaluate the sensitivity of those holdings to changes in interest rates and yield relationships. PIMCO also conducts its own independent credit analysis, rather than relying exclusively on the findings of

B-1

rating agencies. The firm focuses its research on individual issues and sectors it expects to exhibit improving credit profiles that are not fully reflected in the current credit premiums or where it estimates the credit spreads more than compensate for the estimated credit and liquidity risks.

Working closely with Mark McCray, the individual at PIMCO who has primary responsibility for the day-to-day portfolio management of the Fund, will be PIMCO's credit research group, consisting of 10 credit analysts and three portfolio managers who have a combined 152 years of professional experience.

The Benefits of Investing in a Closed-End, Exchange-Traded Fund

Investing in a closed-end municipal bond fund offers the potential for higher tax-exempt yield, and the stock exchange listing is designed to provide flexibility and potential liquidity. And, since closed-end portfolios are not subject to the daily cash flow swings of open-end funds, their structure may present a more favorable platform for the manager to achieve greater tax-exempt income and enhanced portfolio value.

An Opportune Time to Invest in Municipal Bonds

Municipal Bond Yields at High Levels. As of April 30, 2001, tax-exempt municipal bonds were yielding approximately 108% of 10-year Treasury taxable yields. Since the end of 1989, municipal bonds have, on average, yielded approximately 94% of yields on 10-year U.S. Treasury bonds.

Relationship between the General Obligation Municipal Bond Buyer Index and 10-year Treasury Bonds.

                                        10 Year BB40/
Date                    BB40            Treasury        10 Year
12/29/89                7.25            7.91            91.7
1/31/90                 7.45            8.41            88.6
2/28/90                 7.4             8.51            87.0
3/30/90                 7.52            8.63            87.1
4/30/90                 7.74            9.02            85.8
5/31/90                 7.53            8.59            87.7
6/29/90                 7.5             8.41            89.2
7/31/90                 7.35            8.34            88.1
8/31/90                 7.64            8.84            86.4
9/28/90                 7.79            8.80            88.5
10/31/90                7.71            8.63            89.3
11/30/90                7.47            8.24            90.7
12/31/90                7.47            8.05            92.8
1/31/91                 7.39            8.01            92.3
2/28/91                 7.36            8.02            91.8
3/28/91                 7.34            8.05            91.2
4/30/91                 7.26            8.00            90.8
5/31/91                 7.21            8.05            89.6
6/28/91                 7.21            8.22            87.7
7/31/91                 7.11            8.13            87.5
8/30/91                 6.97            7.81            89.2
9/30/91                 6.89            7.44            92.6
10/31/91                6.85            7.45            91.9
11/29/91                6.9             7.37            93.6
12/31/91                6.66            6.69            99.6
1/31/92                 6.72            7.36            91.3
2/28/92                 6.76            7.29            92.7
3/31/92                 6.76            7.54            89.7
4/30/92                 6.74            7.56            89.2
5/29/92                 6.63            7.32            90.6
6/30/92                 6.49            7.12            91.2
7/31/92                 6.19            6.69            92.5
8/31/92                 6.35            6.61            96.1
9/30/92                 6.39            6.35           100.6
10/30/92                6.68            6.88            97.1
11/30/92                6.42            6.99            91.8
12/31/92                6.39            6.74            94.8
1/29/93                 6.31            6.45            97.8
2/26/93                 6.01            6.11            98.4
3/31/93                 6.04            6.12            98.7
4/30/93                 5.96            6.11            97.5
5/28/93                 5.89            6.19            95.2
6/30/93                 5.76            5.80            99.3
7/30/93                 5.78            5.83            99.1
8/31/93                 5.6             5.52           101.4
9/30/93                 5.47            5.44           100.6
10/29/93                5.48            5.47           100.2
11/30/93                5.65            5.83            96.9
12/31/93                5.52            5.83            94.7
1/31/94                 5.45            5.64            96.6
2/28/94                 5.77            6.14            94.0
3/31/94                 6.36            6.75            94.2
4/29/94                 6.37            7.08            90.0
5/31/94                 6.4             7.20            88.9
6/30/94                 6.47            7.38            87.7
7/29/94                 6.33            7.16            88.4
8/31/94                 6.36            7.22            88.1
9/30/94                 6.58            7.64            86.1
10/31/94                6.85            7.83            87.5
11/30/94                7.16            7.95            90.1
12/30/94                6.92            7.88            87.8
1/31/95                 6.66            7.65            87.1
2/28/95                 6.42            7.21            89.0
3/31/95                 6.37            7.19            88.6
4/28/95                 6.35            7.19            88.3
5/31/95                 6.1             6.32            96.5
6/30/95                 6.28            6.17           101.8
7/31/95                 6.19            6.53            94.8
8/31/95                 6.11            6.39            95.6
9/29/95                 6.07            6.28            96.7
10/31/95                5.91            6.09            97.0
11/30/95                5.74            5.75            99.8
12/29/95                5.56            5.57            99.8
1/31/96                 5.57            5.60            99.5
2/29/96                 5.71            6.12            93.3
3/29/96                 5.96            6.32            94.3
4/30/96                 6.05            6.64            91.1
5/31/96                 6.09            6.84            89.0
6/28/96                 6.01            6.71            89.6
7/31/96                 5.98            6.79            88.1
8/30/96                 6.02            6.94            86.7
9/30/96                 5.89            6.70            87.9
10/31/96                5.83            6.35            91.8
11/29/96                5.66            6.04            93.7
12/31/96                5.72            6.46            88.5
1/31/97                 5.82            6.54            89.0
2/28/97                 5.76            6.54            88.1
3/31/97                 5.95            6.91            86.1
4/30/97                 5.89            6.71            87.8
5/30/97                 5.74            6.66            86.2
6/30/97                 5.69            6.50            87.5
7/31/97                 5.4             6.01            89.9
8/29/97                 5.55            6.33            87.7
9/30/97                 5.47            5.97            91.6
10/31/97                5.4             5.71            94.6
11/28/97                5.36            5.80            92.4
12/31/97                5.26            5.68            92.6
1/30/98                 5.19            5.44            95.3
2/27/98                 5.24            5.62            93.2
3/31/98                 5.27            5.66            93.1
4/30/98                 5.39            5.67            95.1
5/29/98                 5.22            5.55            94.1
6/30/98                 5.22            5.43            96.1
7/31/98                 5.26            5.54            95.0
8/31/98                 5.11            5.15            99.3
9/30/98                 5.04            4.46           112.9
10/30/98                5.13            4.61           111.2
11/30/98                5.1             4.72           108.0
12/31/98                5.16            4.64           111.2
1/29/99                 5.09            4.65           109.4
2/26/99                 5.17            5.52            93.7
3/31/99                 5.23            5.51            94.9
4/30/99                 5.28            5.51            95.9
5/28/99                 5.37            5.63            95.4
6/30/99                 5.55            5.81            95.6
7/30/99                 5.59            5.90            94.7
8/31/99                 5.78            5.97            96.8
9/30/99                 5.89            5.89           100.1
10/29/99                6.08            6.29            96.6
11/30/99                6.11            6.40            95.5
12/31/99                6.22            6.67            93.3
1/31/00                 6.31            6.82            92.5
2/29/00                 6.17            6.41            96.2
3/31/00                 5.97            6.56            91.0
4/28/00                 6               6.71            89.4
5/31/00                 6.13            6.74            90.9
6/30/00                 5.91            6.47            91.4
7/31/00                 5.79            6.43            90.0
8/31/00                 5.72            5.73            99.8
9/29/00                 5.82            5.80           100.4
10/31/00                5.74            6.00            95.7
11/30/00                5.72            5.68           100.7
12/29/00                5.47            5.33           102.6
1/31/01                 5.44            5.12           106.2
2/28/01                 5.4             4.90           110.2
3/30/01                 5.3             4.92           107.7
4/30/01                 5.49            5.05           108.6
                                        Average         93.9

Chart Source: FactSet. The General Obligation Municipal Bond Buyer Index is an unmanaged index and contains 20 general obligation municipal bonds with 10-year maturities. The yield quoted above is a simple unweighted average of the estimated yields of bonds in the index if those bonds were sold at par value. Unlike the Funds, the Index carries no management fees, account charges or other expenses. It is not possible to invest directly in an index. U.S. Treasury bonds offer a government guarantee as to timely payment of interest and repayment of principal on maturity; income is tax-exempt at the state and local levels. Municipal bonds are not guaranteed by the U.S. Government. In addition to general obligation bonds, municipal obligations can include revenue and insured bonds. The historical yield information shown in

B-2

the chart does not predict how municipal bonds or 10-year U.S. Treasury bonds will perform in the future or how the Funds would have performed under similar market conditions. For example, recent political developments, including proposed federal tax legislation, could adversely effect the yield of municipal bonds relative to U.S. Treasury bonds and other fixed income investments in future periods.

Steep Yield Curve Creates Positive Environment for Leveraged Funds. As of the date of this Statement of Additional Information, Federal Reserve interest rate cuts have recently created a steeper yield curve. Lower short-term interest rates mean that leveraged funds will likely pay lower dividends to preferred shareholder, leaving more tax-exempt income to pay common shareholder dividends. PIMCO anticipates that still more Federal Reserve rate cuts are ahead, although there can be no guarantee.

What Tax-Free Income Could Mean to You

The chart below will assist you in more easily comparing municipal investments, such as the Fund, with taxable investments. It is designed to show you how much income you would have to receive from a taxable investment to earn as much as you would by investing in a tax-free municipal bond fund.

Funds investing in bonds issued by a single state attempt to provide income that is free from both federal and state income taxes for residents in that state. This may be especially attractive for residents of high income tax states like California and New York. For example, to equal a California investor's tax-free yield of 6.00%, a person in the 37.4% combined federal and state tax bracket would need to find a taxable investment yielding 9.58% to provide the same amount of after-tax income.

---------------------------------------------------------------------------------------------------------------------------
  A tax-exempt yield of
                                          5.00%             5.50%             6.00%             6.50%             7.00%
---------------------------------------------------------------------------------------------------------------------------
Combined Tax Brackets                     Equals a taxable investment yield of
---------------------------------------------------------------------------------------------------------------------------
Federal Only
---------------------------------------------------------------------------------------------------------------------------
30.50%                                    7.19%             7.91%             8.63%             9.35%            10.07%
---------------------------------------------------------------------------------------------------------------------------
35.50%                                    7.75%             8.53%             9.30%            10.08%            10.85%
---------------------------------------------------------------------------------------------------------------------------
39.10%                                    8.21%             9.03%             9.85%            10.67%            11.49%
---------------------------------------------------------------------------------------------------------------------------

Federal & California Double Tax-Free
---------------------------------------------------------------------------------------------------------------------------
36.96%                                    7.93%             8.72%             9.52%            10.31%            11.10%
---------------------------------------------------------------------------------------------------------------------------
41.50%                                    8.55%             9.40%            10.26%            11.11%            11.97%
---------------------------------------------------------------------------------------------------------------------------
44.76%                                    9.05%             9.96%            10.86%            11.77%            12.67%
---------------------------------------------------------------------------------------------------------------------------

Federal & New York (State) Double Tax-Free
---------------------------------------------------------------------------------------------------------------------------
35.26%                                    7.72%             8.50%             9.27%            10.04%            10.81%
---------------------------------------------------------------------------------------------------------------------------
39.92%                                    8.32%             9.15%             9.99%            10.82%            11.65%
---------------------------------------------------------------------------------------------------------------------------
43.27%                                    8.81%             9.70%            10.58%            11.46%            12.34%
---------------------------------------------------------------------------------------------------------------------------

New York City Triple Tax-Free
---------------------------------------------------------------------------------------------------------------------------
37.80%                                    8.04%             8.84%             9.65%            10.45%            11.25%
---------------------------------------------------------------------------------------------------------------------------
42.27%                                    8.66%             9.53%            10.39%            11.26%            12.13%
---------------------------------------------------------------------------------------------------------------------------
45.49%                                    9.17%            10.09%            11.01%            11.92%            12.84%
---------------------------------------------------------------------------------------------------------------------------

B-3

The tax-free yields used in this table are for illustration only, and do not represent or predict the tax-free yield of the Fund. The table reflects marginal federal and state tax rates effective after June 30, 2001, except California which reflects 2000 marginal CA and federal tax rates effective after June 30, 2001. Under the Economic Growth and Tax Relief Reconciliation Act of 2001, the current 30.5%, 35.5% and 39.1% federal income tax rates are phased down over six years to 28%, 33% and 35%, respectively. Each of the current rates will be reduced by one-half percentage point for the 2002 tax year, and an additional one percentage point in 2004. The remainder of the reduction will occur in 2006. This reduction in federal income tax rates will reduce the advantage you gain from investing in tax-free investment vehicles. The combined federal and state tax rates shown here are among the highest possible for each state. There are lower combined rates. Residents of states other than California and New York pay taxes to their states at different rates than those shown above. The lower your combined federal and state tax rate, the less advantage you gain from investing in tax-free investment vehicles. A federal tax benefit is provided for the state and city income tax paid. The tables do not take into account, among other things, the effects of the federal alternative minimum tax or capital gains taxes. In addition, the Fund may invest in securities that are not exempt from federal or state income taxes, although they do not intend to do so under normal circumstances. Consult your financial advisor for more information.

B-4

PART C - OTHER INFORMATION

Item 24: Financial Statements and Exhibits

1. Financial Statements:

Registrant has not conducted any business as of the date of this filing, other than in connection with its organization. Financial Statements indicating that the Registrant has met the net worth requirements of Section 14(a) of the 1940 Act are filed herewith as part of the Statement of Additional Information.

2. Exhibits:

a. Amended and Restated Agreement and Declaration of Trust dated June 19, 2001.(1)

b. By-Laws of Registrant.(1)

c.    None.

d.1   Article III (Shares) and Article V (Shareholders' Voting Powers and
      Meetings) of the Amended and Restated Agreement and Declaration of
      Trust.(1)
d.2   Article 10 (Shareholders' Voting Powers and Meetings) of the By-Laws of
      the Registrant.(1)
d.3   Form of Share Certificate of the Common Shares.(1)


e.    Terms and Conditions of Dividend Reinvestment Plan.(1)


f.    None.

g.1   Form of Investment Management Agreement between Registrant and PIMCO
      Advisors L.P.(1)


g.2   Form of Portfolio Management Agreement between PIMCO Advisors L.P. and
      Pacific Investment Management Company LLC.(1)


h.1   Form of Underwriting Agreement.(1)


h.2   Form of Master Selected Dealer Agreement.(1)


h.3   Form of Master Agreement among Underwriters.(1)


i.    None.

j.    Form of Custodian Agreement between Registrant and State Street Bank and
      Trust Co.(1)


k.1   Form of Transfer Agency Services Agreement between Registrant and
      PFPC Inc.(1)


      (1) Incorporated by reference from the corresponding exhibit of Pre-
          Effective Amendment No. 2 to the Trust's Registration Statement on
          Form N-2 (File Nos. 811-10377 and 333-61062), as filed June 25, 2001.

C-1

k.2   Form of Organizational and Offering Expenses Reimbursement Agreement
      between Registrant and PIMCO Advisors L.P.(1)


k.3   Form of Fee Waiver Agreement between Registrant and PIMCO Advisors
      L.P.(1)


k.4   Form of Fee Waiver Agreement between PIMCO Advisors L.P. and Pacific
      Investment Management Company LLC.(1)


l.    Opinion and consent of Ropes & Gray.(1)


m.    None.

n.    Consent of PricewaterhouseCoopers LLP.(1)


o.    None.

p.    Subscription Agreement of PIMCO Advisors L.P., dated June 19, 2001, filed
      herewith.


q.    None.

r.1   Code of Ethics of Registrant.(1)

r.2   Code of Ethics of PIMCO Advisors L.P.(1)

r.3   Code of Ethics of Pacific Investment Management Company LLC.(1)


s.    Power of Attorney for each of Messrs. Treadway, Shlissel, Connor, Belica
      and Schott.(1)


(1) Incorporated by reference from the corresponding exhibit of Pre- Effective Amendment No. 2 to the Trust's Registration Statement on Form N-2 (File Nos. 811-10377 and 333-61062), as filed June 25, 2001.

Item 25: Marketing Arrangements

See Sections 3(p), 4(h) 5(i), 8 and 9 of Exhibit h.1 of Item 24 of this Registration Statement and Sections 8, 9 and 15 of Exhibit h.3 of Item 24 of this Registration Statement.

C-2

Item 26: Other Expenses of Issuance and Distribution

Securities and Exchange Commission fees     $ 62,500*
National Association of Securities Dealers,   25,500*
Inc. fees
Printing and engraving expenses              240,000*
Legal Fees                                   202,500*
New York Stock Exchange listing fees         126,600*
Accounting expenses                           10,000*
Underwriter reimbursement                    192,000*
Miscellaneous expenses                         5,000*
                                             --------
        Total                                864,150*
                                             ========

PIMCO Advisors L.P. has agreed to pay the amount by which the aggregate of all of the Fund's organizational expenses and all offering costs (other than the sales load) exceeds $0.03 per common share of beneficial interest.

* Estimated expense

Item 27: Persons Controlled by or under Common Control with Registrant

Not applicable.

Item 28: Number of Holders of Securities

At June 25, 2001

                                              Number of
               Title of Class               Record Holders
               --------------               --------------

         Common Shares, no par value               1

Item 29: Indemnification

Reference is made to Article VIII, Sections 1 through 4, of the Registrant's Amended and Restated Agreement and Declaration of Trust, which is incorporated by reference herein.

Insofar as indemnification for liabilities arising under the Securities Act of 1933, as amended (the "Act"), may be permitted to trustees, officers and controlling persons of the Registrant by the Registrant pursuant to the Trust's Amended and Restated Agreement and Declaration of Trust, its By-Laws or otherwise, the Registrant is aware that in the opinion of the Securities and Exchange Commission, such indemnification is against public policy as expressed in the Act and, therefore, is unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by trustees, officers or controlling persons of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such trustees, officers or controlling persons in connection with the securities being

C-3

registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.

The Registant, PIMCO Advisors L.P., Pacific Investment Management Company LLC and their respective trustees, directors and officers are insured by directors and officers/errors and ommissions liability policies.

Item 30: Business and Other Connections of Investment Adviser

Descriptions of the business of PIMCO Advisors L.P., the Registrant's investment manager, and Pacific Investment Management Company LLC, the Registrant's portfolio manager, are set forth under the captions "Investment Manager" and "Portfolio Manager" under "Management of the Fund" in both the prospectus and Statement of Additional Information forming part of this Registration Statement. The following sets forth business and other connections of each director and executive officer (and persons performing similar functions) of PIMCO Advisors L.P. and Pacific Investment Management Company LLC.

PIMCO Advisors L.P.

1345 Avenue of the Americas
New York, NY 10105

Name                   Position with Advisor      Other Connections
---------------------- -------------------------- ------------------------------

Joachim Faber, Dr.     Chief Executive Officer    Member of the Board of
                                                  Allianz AG

Udo Frank              Managing Director; Chief   Managing Director and Chief
                       Investment Officer         Investment Officer of Allianz
                                                  Asset Advisory and Management
                                                  GmbH

Robert M. Fitzgerald   Executive Vice President   Chief Financial Officer PIMCO
                       and Chief Financial        Funds Distributors LLC,
                       Officer                    Cadence Capital Management,
                                                  NFJ Investment Group,
                                                  Parametric Portfolio
                                                  Associates, Pacific Investment
                                                  Management Company LLC and
                                                  StocksPLUS Management, Inc.;
                                                  Executive Vice President and
                                                  Chief Financial Officer, Value
                                                  Advisors LLC; and Chief
                                                  Financial Officer PIMCO Funds
                                                  Advertising Agency.

                                       C-4

Kenneth M. Poovey      Managing Director; Chief   Chief Executive Officer,
                       Executive Officer of U.S.  Value Advisors LLC,
                       Equity Division of PIMCO   Oppenheimer Capital
                       Advisors

Stephen J. Treadway    Managing Director          Chairman, President and Chief
                                                  Executive Officer, PIMCO
                                                  Funds Advertising Agency,
                                                  Inc., PIMCO Funds
                                                  Distributors LLC

James G. Ward          Executive Vice President,  Executive Vice President,
                       Human Resources            Human Resources, Value
                                                  Advisors LLC

C-5

Stewart A. Smith       Secretary                  Secretary, NFJ Investment
                                                  Group, Parametric Portfolio
                                                  Associates; Assistant
                                                  Secretary, Cadence Capital
                                                  Management

Pacific Investment Management Company LLC
("PIMCO")

840 Newport Center Drive, Suite 300

                             Newport Beach, CA 92660

Name                          Business and Other Connections
----------------------------- --------------------------------------------------

Arnold, Tamara J.             Executive Vice President, PIMCO

Benz, William R. II           Managing Director, Executive Committee Member,
                              PIMCO

Bhansali, Vineer              Executive Vice President, PIMCO

Brynjolfsson, John B.         Executive Vice President, PIMCO

Burns, R. Wesley              Managing Director, PIMCO; President and Trustee of
                              PIMCO Funds and PIMCO Variable Insurance Trust;
                              President and Director of PIMCO Commercial
                              Mortgage Securities Trust, Inc.; Director, PIMCO
                              Funds: Global Investors Series plc and PIMCO
                              Global Advisors (Ireland) Limited

Cupps, Wendy W.               Executive Vice President, PIMCO

Dialynas, Chris               Managing Director, PIMCO

Ehlert, A. Benjamin           Executive Vice President, PIMCO

El-Erian, Mohamed A.          Managing Director, PIMCO

                                       C-6

Feingold, Andrea S.           Executive Vice President, PIMCO

Gross, William H.             Managing Director and Executive Committee Member,
                              PIMCO; Director and Vice President, StocksPLUS
                              Management, Inc.; Senior Vice President of PIMCO
                              Funds and PIMCO Variable Insurance Trust

Hague, John L.                Managing Director, PIMCO

Hally, Gordon C.              Executive Vice President, PIMCO

Hamalainen, Pasi M.           Managing Director, PIMCO

Harris, Brent R.              Managing Director and Executive Committee Member,
                              PIMCO; Director and Vice President, StocksPLUS
                              Management, Inc.; Trustee and Chairman of PIMCO
                              Funds and PIMCO Variable Insurance Trust; Director
                              and Chairman, PIMCO Commercial Mortgage Securities
                              Trust, Inc.

                                       C-7

Hinman, David C.              Executive Vice President, PIMCO

Hodge, Douglas M.             Executive Vice President, PIMCO

Holden, Brent L.              Managing Director, PIMCO

Isberg, Margaret E.           Managing Director, PIMCO; Senior Vice President of
                              PIMCO Funds

Keller, James M.              Executive Vice President, PIMCO

Kennedy, Raymond G.           Executive Vice President, PIMCO

Loftus, John S.               Managing Director, PIMCO; Senior Vice President of
                              PIMCO Funds; Vice President and Assistant
                              Secretary, StocksPLUS Management, Inc.

Mariappa, Sudesh N.           Executive Vice President, PIMCO

Mather, Scott A.              Executive Vice President, PIMCO; Senior Vice
                              President, PIMCO Commercial Mortgage Securities
                              Trust, Inc.

McCray, Mark V.               Executive Vice President, PIMCO

McCulley, Paul A.             Managing Director, PIMCO

McDevitt, Joseph E.           Executive Vice President, PIMCO; Director and
                              Chief Executive Officer, PIMCO Global Advisors
                              (Europe) Limited

                                       C-8

Muzzy, James F.               Managing Director, PIMCO; Director and Vice
                              President, StocksPLUS Management, Inc.; Senior
                              Vice President, PIMCO Variable Insurance Trust;
                              Vice President of PIMCO Funds

Otterbein, Thomas J.          Executive Vice President, PIMCO

Phansalkar, Mohan V.          Executive Vice President, Senior Legal Officer
                              and Assistant Secretary, PIMCO; Vice President and
                              Assistant Secretary, StocksPLUS Management, Inc.

Powers, William C.            Managing Director and Executive Committee Member,
                              PIMCO; Senior Vice President, PIMCO Commercial
                              Mortgage Securities Trust, Inc.

Schmider, Ernest L.           Managing Director and Secretary, PIMCO; Director
                              and Assistant Secretary, StocksPLUS Management,
                              Inc.


Simon, Scott                  Executive Vice President, PIMCO

Thomas, Lee R.                Managing Director, PIMCO

                                       C-9

Thompson, William S. Jr.      Chief Executive Officer, Managing Director and
                              Executive Committee Member, PIMCO; Director and
                              President, StocksPLUS Management, Inc.; Senior
                              Vice President of PIMCO Variable Insurance Trust;
                              Vice President of PIMCO Funds and PIMCO Commercial
                              Mortgage Securities Trust, Inc.

Trosky, Benjamin L.           Managing Director, PIMCO; Senior Vice President,
                              PIMCO Commercial Mortgage Securities Trust, Inc.

Weil, Richard M.              Chief Operating Officer, PIMCO

Wood, George H.               Executive Vice President, PIMCO

Item 31: Location of Accounts and Records

The account books and other documents required to be maintained by the Registrant pursuant to Section 31(a) of the Investment Company Act of 1940 and the Rules thereunder will be maintained at the offices of State Street Bank & Trust Co., 225 Franklin Street, Boston, MA 02110 and/or PFPC Inc., 400 Bellevue Parkway, Wilmington, Delaware 19809.

Item 32: Management Services

Not applicable.

C-10

Item 33: Undertakings

1. Registrant undertakes to suspend the offering of its Common Shares until it amends the prospectus filed herewith if (1) subsequent to the effective date of its registration statement, the net asset value declines more than 10 percent from its net asset value as of the effective date of the registration statement, or (2) the net asset value increases to an amount greater than its net proceeds as stated in the prospectus.

2. Not applicable.

3. Not applicable.

4. Not applicable.

5. The Registrant undertakes that:

a. For purposes of determining any liability under the Securities Act of 1933, the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in the form of prospectus filed by the Registrant under Rule 497(h) under the Securities Act of 1933 shall be deemed to be part of this registration statement as of the time it was declared effective; and

b. For the purpose of determining any liability under the Securities Act of 1933, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of the securities at that time shall be deemed to be the initial bona fide offering thereof.

6. The Registrant undertakes to send by first class mail or other means designed to ensure equally prompt delivery, within two business days of receipt of a written or oral request, any Statement of Additional Information.

Notice

A copy of the Agreement and Declaration of Trust of PIMCO Municipal Income Fund (the "Fund"), together with all amendments thereto, is on file with the Secretary of State of The Commonwealth of Massachusetts, and notice is hereby given that this instrument is executed on behalf of the Fund by any officer of the Fund as an officer and not individually and that the obligations of or arising out of this instrument are not binding upon any of the Trustees of the Fund or shareholders of the Fund individually, but are binding only upon the assets and property of the Fund.

C-11

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, and the State of New York on the 26th day of June, 2001.

PIMCO MUNICIPAL INCOME FUND

By: /s/ Stephen J. Treadway
    -----------------------
    Stephen J. Treadway,
    President

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

Name                           Capacity                      Date
----                           --------                      ----

/s/ Stephen J. Treadway        Trustee and President         June 26, 2001
------------------------------
Stephen J. Treadway


Paul Belica*                   Trustee                       June 26, 2001
------------------------------
Paul Belica


Robert E. Connor*              Trustee                       June 26, 2001
------------------------------
Robert E. Connor


/s/ Brian S. Shlissel          Treasurer and Principal       June 26, 2001
------------------------------ Financial and Accounting
Brian S. Shlissel              Officer



                                        *By: /s/ Stephen J. Treadway
                                             ---------------------------
                                             Stephen J. Treadway,
                                             Attorney-In-Fact

                                             Date: June 26, 2001


INDEX TO EXHIBITS

Exhibit                      Exhibit Name
-------                      ------------

p.       Subscription Agreement of PIMCO Advisors L.P.


Exhibit P

PIMCO MUNICIPAL INCOME FUND

Subscription Agreement

This Agreement made this 19th day of June, 2001, by and between PIMCO Municipal Income Fund, a Massachusetts business trust (the "Fund"), and PIMCO Advisors L.P., a Delaware limited partnership (the "Subscriber");

WITNESSETH:

WHEREAS, the Fund has been formed for the purposes of carrying on business as a closed-end management investment company; and

WHEREAS, the Subscriber has been selected by the Fund's Board of Trustees to serve as investment manager to the Fund; and

WHEREAS, the Subscriber wishes to subscribe for and purchase, and the Fund wishes to sell to the Subscriber, 6,667 common shares of beneficial interest, no par value, for a purchase price of $15.00 per share;

NOW THEREFORE, IT IS AGREED:

1. The Subscriber subscribes for and agrees to purchase from the Fund 6,667 common shares of beneficial interest, no par value, for a purchase price of $15.00 per share and an aggregate purchase price of $100,005.00. Subscriber agrees to make payment for these shares at such time as demand for payment may be made by an officer of the Fund.

2. The Fund agrees to issue and sell said shares to Subscriber promptly upon its receipt of the aggregate purchase price.

3. To induce the Fund to accept its subscription and issue the shares subscribed for, the Subscriber represents that it is informed as follows:

(a) That the shares being subscribed for have not been and will not be registered under the Securities Act of 1933 ("Securities Act"), or registered or qualified under the securities laws of any state;

(b) That the shares will be sold by the Fund in reliance on an exemption from the registration requirements of the Securities Act;

(c) That the Fund's reliance upon an exemption from the registration requirements of the Securities Act is predicated in part on the representations and agreements contained in this Subscription Agreement;


(d) That when issued, the shares will be "restricted securities" as defined in paragraph (a)(3) of Rule 144 of the General Rules and Regulations under the Securities Act ("Rule 144") and cannot be sold or transferred by Subscriber unless they are subsequently registered under the Securities Act or unless an exemption from such registration is available; and

(e) That there do not appear to be any exemptions from the registration provisions of the Securities Act available to the Subscriber for resale of the shares. In the future, certain exemptions may possibly become available, including an exemption for limited sales in accordance with the conditions of Rule 144.

The Subscriber understands that a primary purpose of the information acknowledged in subparagraphs (a) through (e) above is to put the Subscriber on notice as to restrictions on the transferability of the shares.

4. To further induce the Fund to accept its subscription and issue the shares subscribed for, the Subscriber:

(a) Represents and warrants that the shares subscribed for are being and will be acquired for investment for its own account and not on behalf of any other person or persons and not with a view to, or for sale in connection with, any public distribution thereof; and

(b) Agrees that any certificates representing the shares subscribed for may bear a legend substantially in the following form:

The shares represented by this certificate have been acquired for investment and have not been registered under the Securities Act of 1933 or any other federal or state securities law. These shares may not be offered for sale, sold or otherwise transferred unless registered under said securities laws or unless some exemption from registration is available.

(c) Consents, as the sole holder of the Fund's common shares of beneficial interest and pursuant to Section 23(b)(2) of the Investment Company Act of 1940, to the issuance by the Fund of common shares of beneficial interest at a price per share as set forth in the Underwriting Agreement relating to the public offering of the common shares of beneficial interest.

5. This Subscription Agreement and all of its provisions shall be binding upon the legal representatives, heirs, successors and assigns of the parties hereto.

6. The Fund's Agreement and Declaration of Trust is on file with the Secretary of State of The Commonwealth of Massachusetts. This Agreement is executed on behalf of the Fund by the Fund's officers as officers and not individually and the obligations imposed upon the Fund by this Agreement are not binding upon any of the Fund's Trustees, officers or shareholders individually but are binding only upon the assets and property of the Fund.

-2-

IN WITNESS WHEREOF, this Subscription Agreement has been executed by the parties hereto as of the day and date first above written.

PIMCO MUNICIPAL INCOME FUND

By: /s/ Newton B. Schott, Jr.
    ____________________________________
    Name:   Newton B. Schott, Jr.
    Title:  Vice President and Secretary

PIMCO ADVISORS L.P.

By: /s/ Stephen J. Treadway
    ____________________________________
    Name:   Stephen J. Treadway
    Title:  Executive Vice President

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