As filed with the Securities and Exchange Commission on May 21, 2009

1933 Act File No. 333-156948

1940 Act File No. 811-22269

U.S. SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-2

(Check appropriate box or boxes)

Registrant’s Telephone Number, including Area Code (617) 482-8260

FREDERICK S. MARIUS

Two International Place, Boston, Massachusetts 02110

Name and Address (of Agent for Service)

Copies of Communications to:

CALCULATION OF REGISTRATION FEE UNDER THE SECURITIES ACT OF 1933

Investment objectives and policies.     Eaton Vance National Municipal Opportunities Trust (the “Trust”) is a newly organized, diversified, closed-end management investment company. The Trust’s primary investment objective is to provide current income exempt from federal income tax. The Trust will, as a secondary investment objective, seek to achieve capital appreciation. The Trust will invest primarily in municipal obligations that, at the time of investment, are investment grade quality. The Trust also may invest a portion of its assets in municipal obligations rated below investment grade quality or unrated securities that the Trust’s investment adviser considers to be of comparable quality. The Trust’s net asset value and distribution rate will vary and may be affected by several factors, including changes in interest rates and the credit quality of municipal issuers. An investment in the Trust may not be appropriate for all investors, particularly those that are not subject to federal income tax. There is no assurance that the Trust will achieve its investment objectives.

Portfolio contents.     During normal market conditions, the Trust will invest at least 80% of its gross assets in debt obligations issued by or on behalf of states, territories and possessions of the United States, including the District of Columbia, and their political subdivisions, agencies or instrumentalities, the interest on which is exempt from regular federal income tax (“municipal obligations”), including investments in residual interest bonds whose interest is exempt from regular federal income tax. During normal market conditions, at least 70% of the Trust’s investments in municipal obligations will be investment grade quality at the time of investment. Up to 30% of the Trust’s investments in municipal obligations may be below investment grade quality at the time of investment. Up to 20% of the Trust’s investments in municipal obligations may be subject to the alternative minimum tax. (continued on inside front cover)

Because the Trust is newly organized, its common shares (the “Common Shares”) have no history of public trading. The shares of closed-end investment companies often trade at a discount from their net asset value, which may increase investors’ risk of loss. The returns earned by holders of the Trust’s Common Shares (“Common Shareholders”) who purchase their shares in this offering and sell their shares below net asset value will be reduced. This risk may be greater for investors who intend to sell their shares in a relatively short period after completion of the initial public offering.

Investing in the Trust’s Common Shares involves certain risks. See “ Investment objectives, policies and risks ” beginning on page 17 of this prospectus.

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

The underwriters expect to deliver the Common Shares to purchasers on or about                     , 2009.

UBS Investment Bank

Citi

Merrill Lynch & Co.

Morgan Stanley

Wachovia Securities

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The Trust

Eaton Vance National Municipal Opportunities Trust is a newly organized, diversified, closed-end management investment company registered under the Investment Company Act of 1940, as amended (the “1940 Act”). The Trust is an unincorporated business trust established under the laws of the Commonwealth of Massachusetts by an Agreement and Declaration of Trust dated January 26, 2009 and filed with the Secretary of the Commonwealth on such date (the “Declaration of Trust”). The Trust has no operating history. The Trust’s principal office is located at Two International Place, Boston, Massachusetts 02110 and its telephone number is 1-800-225-6265.

This prospectus relates to the initial public offering of the Trust’s common shares of beneficial interest (the “Common Shares”), par value $0.01 per Share). See “Underwriting.”

Use of proceeds

The net proceeds of this offering of the Trust’s Common Shares will be approximately $             ($             if the underwriters exercise the overallotment option in full) after payment of the sales load and offering costs (other than the sales load) expected to be approximately $0.04 per share. The net proceeds of the offering will be invested in accordance with the Trust’s investment objectives and policies (as stated below) as soon as practicable after completion of the offering. The Trust currently anticipates being able to do so within three months after the completion of the offering. Pending investment of the net proceeds in accordance with the Trust’s investment objectives and policies, the Trust will invest in high-quality, short-term debt securities, cash and/or cash equivalents. Investors should expect, therefore, that before the Trust has fully invested the proceeds of the offering in accordance with its investment objectives and policies, the Trust would earn interest income at a modest rate. If the Trust’s investments are delayed, the first planned distribution could consist principally of a return of capital.

Investment objectives, policies and risks

INVESTMENT OBJECTIVES

The Trust’s primary investment objective is to provide current income exempt from federal income tax. The Trust will, as a secondary investment objective, seek to achieve capital appreciation. The Trust will seek to achieve its investment objectives by investing primarily in municipal obligations (as defined below) that, at the time of investment, are investment grade quality. The Trust also may invest a portion of its gross assets in municipal obligations rated below investment grade or unrated securities that the Adviser considers to be of comparable quality. Securities will be purchased and sold in an effort to maintain a competitive yield and to enhance return based upon the relative value of the securities available in the marketplace. Investments are based on Eaton Vance’s municipal obligations research, trading and portfolio management, which generally are not available to individual investors.

Eaton Vance seeks to find municipal obligations exhibiting relative value as compared to other opportunities in the municipal marketplace. Eaton Vance’s team of research analysts, traders and portfolio managers are devoted exclusively to investing in municipal obligations. The team’s goal is to find municipal bonds that are attractively priced in relation to other available opportunities due to differing dynamics in individual sectors of the municipal bond market, municipal bond supply, and the

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structure of individual bonds, especially in regard to maturities, coupons, and call dates. Eaton Vance views research capability as being key to identifying trends that affect the yield-spread relationship among bonds.

PRIMARY INVESTMENT POLICIES

General composition of the Trust

During normal market conditions, the Trust will invest at least 80% of its gross assets in debt obligations issued by or on behalf of states, territories and possessions of the United States, including the District of Columbia, and their political subdivisions, agencies or instrumentalities, the interest on which is exempt from regular federal income tax (“municipal obligations”). For purposes of this 80% policy, municipal obligations will include investments in residual interest bonds whose interest is exempt from regular federal income tax.

During normal market conditions, at least 70% of the Trust’s investments in municipal obligations will be investment grade quality at the time of investment. A municipal obligation is considered investment grade quality if it is either (i) rated within the four highest ratings categories by at least one nationally recognized statistical rating organization (a “Rating Agency”), which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”) or BBB or higher by Standard & Poor’s Ratings Services (“S&P”) or Fitch Ratings (“Fitch”), or (ii) an unrated municipal obligation that the Trust’s investment adviser considers to be of investment grade quality. If a municipal obligation is rated differently by two or more Rating Agencies, the Trust will use the higher of such ratings (the “Municipal Obligation Rating”). If a municipal obligation is insured, the Trust will use the higher of the Municipal Obligation Rating or the insurance issuer’s rating. Securities rated in the fourth highest category (i.e., Baa by Moody’s or BBB by S&P or Fitch) are considered investment grade quality, but may have speculative characteristics.

Up to 30% of the Trust’s investments in municipal obligations may be in securities of issuers that are below investment grade quality at the time of investment. A municipal obligation is considered below investment grade quality if it is either (i) rated below investment grade by a Rating Agency, or (ii) an unrated municipal obligation that the Trust’s investment adviser considers to be of comparable quality. Municipal obligations of below investment grade quality (commonly referred to as “junk” bonds) involve special risks as compared to municipal obligations of investment grade quality. These risks include greater sensitivity to a general economic downturn, greater market price volatility and less secondary market trading. The Trust may invest in below investment grade municipal obligations of any quality. The Trust has no current intention, however, for more than 5% of its municipal obligation investments to consist of securities that, at the time of investment, are rated below B- by S&P or Fitch, rated below B3 by Moody’s or that are unrated but that the Adviser considers to be of comparable quality. This means that up to 5% of the Trust’s investments in municipal obligations may be in securities of issuers that are having financial difficulties, which may include being in default on obligations to pay principal or interest thereon when due or involved in bankruptcy or insolvency proceedings (such securities are commonly referred to as “distressed securities”). The Trust generally will not invest more than 2% of its gross assets in any security of below investment grade quality. For a description of municipal obligation ratings, see Appendix A to the Statement of Additional Information.

Up to 20% of the Trust’s investments in municipal obligations may be subject to the alternative minimum tax. This restriction limits the Trust’s opportunities to invest in higher yielding municipal obligations that are subject to the alternative minimum tax.

The foregoing credit quality policies apply only at the time a security is purchased, and the Trust is not required to dispose of a security in the event that a Rating Agency downgrades its assessment of the

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credit characteristics of a particular issue or withdraws its assessment. In determining whether to retain or sell such a security, Eaton Vance may consider such factors as Eaton Vance’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.

The Trust has adopted certain fundamental investment restrictions set forth in the Statement of Additional Information which may not be changed without a vote of the holders of the Trust’s common shares (“Common Shareholder”). Except for such restrictions and the 80% policy pertaining to investment in municipal obligations set forth above, the investment objectives and policies of the Trust may be changed by the Trust’s Board of Trustees (the “Board”) without Common Shareholder action.

The Trust anticipates that its initial portfolio will be approximately 80% investment grade. Under normal market conditions, the Trust will seek to maintain an average credit quality of investment grade. A portfolio, such as the Trust, that achieves a dollar-weighted average investment grade credit quality by investing primarily in investment grade securities, but that may also invest significantly in below investment grade securities, involves certain risk characteristics that differ from individual fixed income securities with credit ratings equivalent to the portfolio average or from a portfolio consisting mostly of securities of a quality near this average. Most notably, the Trust’s portfolio may contain a higher percentage of assets of lower quality that each individually involve a higher degree of credit risk and may be considered to be speculative in nature. As indicated above, the Trust may invest in unrated obligations for which Eaton Vance will make a credit quality determination for purposes of the Trust’s credit quality policy. To the extent that the Trust invests in such unrated obligations, the Trust’s credit quality will be more dependent on Eaton Vance’s credit analysis than if the Trust invested in only rated obligations. Investment in unrated obligations also involves a potential conflict of interest. In general, investment quality involves a trade-off between potential enhanced return and assumption of additional credit risk. In making credit quality determinations for unrated obligations, there is a possibility of an investment adviser being influenced by the goal of seeking to maximize investment performance. For a description of the risks of investing in below investment grade securities, see “Investment objectives, policies and risks—Risk considerations—Below investment grade securities risks.”

The Trust has no current intention to invest 25% or more of its gross assets (but may invest up to such amounts) in municipal obligations of issuers located in the same state (or U.S. territory), but reserves the flexibility to do so in the future. If the Trust invests 25% or more of its gross assets in any one state (or U.S. territory) the Trust may be more susceptible to adverse economic, political or regulatory occurrences affecting a particular state (or territory).

The Trust is a “diversified” investment company which means that with respect to 75% of its total assets (1) it may not invest more than 5% of its total assets in the securities of any one issuer and (2) it may not own more than 10% of the outstanding voting securities of any one issuer. Therefore, with respect to no more than 25% of its total assets, the Trust may invest more than 5% of the value of its total assets in the obligations of any single issuer. To the extent the Trust invests a relatively high percentage of its assets in obligations of a limited number of issuers, the Trust will be more susceptible to any single corporate, economic, political or regulatory occurrence.

The Trust may purchase and sell various kinds of financial futures contracts and related options, including futures contracts and related options based on various debt securities and securities indices. The Trust also may enter into interest rate, total return and other swaps and forward rate contracts to seek to hedge against changes in interest rates or for other risk management purposes.

The Trust may invest without limitation in derivative instruments (which are instruments that derive their value from another instrument, security or index) acquired for hedging purposes. See “Investment objectives, policies and risks—Additional investment practices—Derivative instruments.”

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Municipal obligations

Municipal obligations include bonds, notes and commercial paper issued for a wide variety of both public and private purposes, the interest on which is, in the opinion of issuer’s counsel (or on the basis of other reliable authority), exempt from federal income tax. Public purpose municipal bonds include general obligation and revenue bonds. General obligation bonds are backed by the taxing power of the issuing municipality. Revenue bonds are backed by the revenues of a project or facility, or from the proceeds of a specific revenue source. Some revenue bonds are payable solely or partly from funds that are subject to annual appropriations by a state’s legislature.

Municipal obligations are often issued by state and local governmental entities to finance or refinance public projects, such as roads, schools, and water supply systems. Municipal obligations also may be issued on behalf of private entities or for private activities, such as housing, medical and educational facility construction, or for privately owned transportation, electric utility and pollution control projects. Municipal obligations may be issued on a long-term basis to provide long-term financing. The repayment of such debt may be secured generally by a pledge of the full faith and credit taxing power of the issuer, a limited or special tax, or any other revenue source, including project revenues, which may include tolls, fees and other user charges, lease payments, and mortgage payments. Municipal obligations also may be issued to finance projects on a short-term interim basis, anticipating repayment with the proceeds of the later issuance of long-term debt. The Trust may purchase municipal obligations in the form of bonds, notes, leases or certificates of participation; structured as callable or non-callable; with payment forms that include fixed coupon, variable rate, zero-coupon, capital appreciation bonds, tender option bonds, and residual interest bonds or inverse floating rate securities. Such municipal obligations also may be acquired through investments in pooled vehicles, partnerships, or other investment companies. No established resale market exists for certain of the municipal obligations in which the Trust may invest. The Trust has no limitation on the amount of its assets that may be invested in securities that are not readily marketable or are subject to restrictions on resale.

Up to 5% of the Trust’s investments in municipal obligations may be collateralized by the proceeds from class action or other litigation against the tobacco industry. Such municipal obligations are backed solely by expected revenues to be derived from lawsuits involving tobacco-related deaths and illnesses which were settled between certain states and American tobacco companies. Tobacco settlement bonds are secured by an issuing state’s proportionate share in the Master Settlement Agreement (“MSA”). The MSA is an agreement, reached out of court in November 1998 between 46 states and nearly all of the U.S. tobacco manufacturers. Under the terms of the MSA, the actual amount of future settlement payments by tobacco manufacturers is dependent on many factors, including, but not limited to, annual domestic cigarette shipments, reduced cigarette consumption, increased taxes on cigarettes, inflation, financial capability of tobacco companies, continuing litigation and the possibility of tobacco manufacturer bankruptcy. Payments made by tobacco manufacturers could be negatively impacted if the decrease in tobacco consumption is significantly greater than the forecasted decline. See “Additional investment information and restrictions—State specific investments” in the Statement of Additional Information for additional information about tobacco settlement bonds and the MSA.

Municipal leases

The Trust may invest in municipal leases and participations therein. Municipal leases are obligations in the form of a lease, installment purchase or conditional sales contract (which typically provide for the title to the leased asset to pass to the governmental issuer) which is issued by state or local governments to acquire equipment and facilities. Interest income from such obligations is generally exempt from local and state taxes in the state of issuance. “Participations” in such leases are undivided interests in a portion of the total obligation. Participations entitle their holders to receive a pro rata share of all payments

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under the lease. The obligation of the issuer under such leases is often subject to the ongoing appropriation by a legislative body, on an annual or other basis, of funds for the payment thereof. Investments in municipal leases are thus subject to the risk that the legislative body will not make the necessary appropriation and the issuer will not otherwise be willing or able to meet its obligation.

Municipal notes

Municipal securities in the form of notes, generally are used by municipal issuers to provide for short-term capital needs, in anticipation of an issuer’s receipt of other revenues or financing, and typically have maturities of up to three years. Municipal notes include bond anticipation, tax anticipation and revenue anticipation notes. Bond, tax and revenue anticipation notes are short-term obligations that are intended to be retired with the proceeds of an anticipated bond issue, tax revenue or facility revenue, respectively. Generally, tax anticipation notes are issued in anticipation of various tax revenues, such as income, sales, property, use and business taxes, and are payable from these specific future taxes. Revenue anticipation notes are issued in expectation of receipt of other kinds of revenue, such as federal revenues available under federal revenue sharing programs. Bond anticipation notes are issued to provide interim financing until long-term bond financing can be arranged. In most cases, the long-term bonds then provide the funds needed for repayment of the bond anticipation notes. Tax and revenue anticipation notes combine individual characteristics of tax anticipation notes and revenue anticipation notes. The anticipated revenues from taxes, grants or bond financing generally secure the obligations of an issuer of municipal notes. An investment in such instruments, however, presents a risk that the anticipated revenues will not be received or that such revenues will be insufficient to satisfy the issuer’s payment obligations under the notes or that refinancing will be otherwise unavailable.

Residual interest bonds

Residual interest bonds, also known as inverse floating rate securities or inverse floaters, are securities whose interest rates bear an inverse relationship to the interest rate on another security or the value of an index. Generally, residual interest bonds represent beneficial interests in a special purpose trust (commonly called a tender option bond trust) formed by a third party sponsor for the purpose of holding municipal bonds. The special purpose trust typically sells two classes of beneficial interests or securities: short-term floating rate municipal securities (sometimes referred to as short-term floating rate securities), which are sold to third party investors, and residual interest bonds, which the Trust would purchase. The short-term floating rate security will be linked to a reference interest rate (such as the London Interbank Offered Rate (“LIBOR”) or the Securities Industry and Financial Markets Association (“SIFMA”) Municipal Bond Swap Index), and the tender option bond trust’s income will be used to pay the coupon on the short-term floating rate security, with any remaining income going toward the residual interest bond. The short-term floating rate securities have first priority on the cash flow from the municipal bonds held by the special purpose trust. Typically, a third party, such as a bank, broker-dealer or other financial institution, grants the floating rate security holders the option, at periodic intervals, to tender their securities to the institution and receive the face value thereof. As consideration for providing the option, the financial institution receives periodic fees. The holder of the short-term floating rate securities effectively holds a demand obligation that bears interest at the prevailing short-term, tax-exempt rate. However, an institution will not be obligated to accept tendered short-term floating rate securities in the event of certain defaults or a significant downgrade in the credit rating assigned to the bond issuer. For its residual interest bonds investment, the Trust receives the residual cash flow from the special purpose trust. Because the holder of the short-term floating rate securities is generally assured liquidity at the face value of the security, the Trust as the holder of the residual interest bond assumes the interest rate cash flow risk and the market value risk associated with the municipal security deposited into the special purpose trust. The volatility of the interest cash flow and the residual market value will vary with the degree to which the trust is leveraged. This is expressed in the ratio of the face value of the short-term floating rate securities in relation to the residual interest bonds that are issued by the special purpose

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trust. All voting rights and decisions to be made with respect to any other rights relating to the municipal bonds held in the special purpose trust are passed through to the Trust, as the holder of the residual interest bonds. Under Financial Accounting Standards Board (FASB) Statement No. 140, “Accounting for Transfers and Servicing of Financial Assets and Extinguishment of Liabilities,” when the Trust deposits municipal bonds in a tender option bond trust the Trust accounts for the transaction described above as a secured borrowing by including the fixed rate bond held by the special purpose trust in its portfolio of investments and the floating rate notes as a liability. A tender option bond trust can be collapsed or closed by either the holder of the residual interest bonds (such as the Trust) or by the liquidity provider. Generally, because the Trust may act to collapse the tender option bond trust and receive the value of the residual interests bonds held by the Trust within 7-days, such residual interest bonds are considered liquid securities when held by the Trust. The Trust anticipates initially incurring economic leverage by investing in residual interest bonds.

Because increases in either the interest rate on the securities or the value of indexes (with which residual interest bonds maintain their inverse relationship) reduce the residual interest paid on residual interest bonds, residual interest bonds’ value is generally more volatile than that of fixed rate bonds. Residual interest bonds have varying degrees of liquidity that approximate the liquidity of the underlying bond(s), and the market price for these securities is volatile. These securities generally will underperform the market of fixed rate bonds in a rising short term interest rate environment, but tend to outperform the market of fixed rate bonds when short term interest rates decline or remain relatively stable. Although volatile, residual interest bonds typically offer the potential for yields exceeding the yields available on fixed rate bonds with comparable credit quality, coupon, call provisions and maturity.

The Adviser may determine to invest in residual interest bonds rather than investing directly in municipal bonds because the embedded leverage provides an opportunity to earn enhanced income. The residual interest payments to which the Trust is entitled consists of all of the interest paid on all of the bonds held in the tender option bond trust less the interest payable to floating rate interest holders and the expenses of the trust. Accordingly, if the short-term rates payable to the floating rate interest holder are lower than the long-term rates on the municipal bonds held in the trust, the Trust as the residual interest holder will receive (i) the difference between these amounts on the portion of the tender option bond trust attributable to floating rate interests; plus (ii) the interest on such municipal bonds on the portion of the tender option bond trust attributable to residual interests; minus trust expenses.

The Trust will invest in residual interest bonds primarily for investment purposes.

Short-term floating rate securities

The Trust may also invest in short-term floating rate securities, as described above, issued by tender option bond trusts. The short-term floating rate security will be linked to a reference interest rate (such as LIBOR or the SIFMA Municipal Bond Swap Index) and the tender option bond trust’s income will be used to pay the coupon on the short-term floating rate security. Generally, the interest rate earned by short-term floating rate securities will be based upon the market rates for municipal obligations with maturities or remarketing provisions that are comparable in duration to the periodic interval of the tender option, which may vary from weekly, to monthly, to extended periods of one year or multiple years. Since the option feature has a shorter term than the final maturity or first call date of the underlying bond deposited in the trust, the Trust as the holder of the floating-rate securities relies upon the terms of the agreement with the financial institution furnishing the option as well as the credit strength of that institution. As further assurance of liquidity, the terms of the trust provide for a liquidation of the municipal security deposited in the trust and the application of the proceeds to pay off the short-term floating rate securities. The trusts that are organized to issue both short-term floating rate

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securities and residual interest bonds generally include liquidation triggers to protect the investor in the short-term floating rate securities. The trusts do not have recourse to the investors in the residual interest bonds. However, in certain cases, at the discretion of the Adviser, the Trust may enter into a separate so-called shortfall and forbearance agreement with the sponsor of a tender option bond trust. The Trust generally may enter into such agreements (i) when the liquidity provider to the tender option bond trust requires such an agreement because the level of leverage in the tender option bond trust exceed the level that the liquidity provider is willing support absent such an agreement; and/or (ii) to seek to prevent the liquidity provider from collapsing the tender option bond trust in the event that the municipal obligation held in the trust has declined in value. Such an agreement would require the Trust to reimburse the sponsor upon termination of the trust the difference between the liquidation value of the bonds held in the trust and the principal amount due to the holders of floating rate interests. In such instances, the Trust may be at risk of loss that exceeds its investment in the residual interest securities. The Trust will segregate or earmark liquid assets with its custodian in accordance with 1940 Act Release No. 10666 (Apr. 18, 1979) to cover these obligations.

Leverage

The Trust anticipates using leverage to seek to enhance returns, initially by investing in residual interest bonds. The Trust will not utilize leverage in excess of 15% of its gross assets. Residual interest bonds are securities that pay interest at rates that vary inversely with changes in prevailing short-term tax-exempt interest rates and provide the economic effect of leverage. Although the Trust has no current intention to do so, the Trust is authorized also to utilize leverage through the issuance of preferred shares and/or borrowings, including the issuance of debt securities. The Trust may borrow for temporary, emergency or other purposes as permitted by the 1940 Act.

“Gross assets” of the Trust shall mean total assets of the Trust, including assets attributable to any form of leverage, minus all accrued expenses incurred in the normal course of operations, but not excluding any liabilities or obligations attributable to leverage obtained through (i) indebtedness of any type (including, without limitation, borrowing through a credit facility or the issuance of debt securities), (ii) the issuance of preferred stock or other similar preference securities, (iii) the reinvestment of collateral received for securities loaned in accordance with the Trust’s investment objectives and policies, and/or (iv) any other means, including by investing in residual interest bonds.

In addition to investing in residual interest bonds, the Trust may invest without limitation in other derivative instruments (which are instruments that derive their value from another instrument, security or index) acquired for hedging purposes.

ADDITIONAL INVESTMENT PRACTICES

Derivative instruments

The Trust may invest without limitation in derivative instruments (which are instruments that derive their value from another instrument, security or index) acquired for hedging purposes. In the course of pursuing these investment strategies, the Trust may purchase and sell derivative contracts based on securities indices and other instruments, purchase and sell futures contracts and options thereon, and enter into various transactions such as swaps, caps, floors or collars. In addition, derivatives may also include new techniques, instruments or strategies that are not currently available. Derivative instruments may be used by the Trust to enhance returns or as a substitute for the purchase or sale of securities. The loss on derivative instruments (other than purchased options) may substantially exceed an investment in these instruments. Additional information about certain derivative instruments is set forth below.

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Swaps

Swap contracts may be purchased or sold to hedge against fluctuations in securities prices, interest rates or market conditions, to mitigate non-payment or default risk to particular securities, baskets of securities or indices. In a standard “swap” transaction, two parties agree to exchange the returns (or differentials in rates of return) on different currencies, securities, baskets of currencies or securities, indices or other instruments, which returns are calculated with respect to a “notional amount,” i.e., the designated referenced amount of exposure to the underlying instruments. The Trust will enter into swaps only on a net basis, i.e . , the two payment streams are netted out, with the Trust receiving or paying, as the case may be, only the net amount of the two payments. If the other party to a swap defaults, the Trust’s risk of loss consists of the net amount of payments that the Trust is contractually entitled to receive that is in excess of collateral posted by the Trust’s counterparty in respect of such liability. The net amount of the excess, if any, of the Trust’s obligations over its entitlements will be maintained in a segregated account by the Trust’s custodian. The Trust will not enter into any swap unless the claims-paying ability of the other party thereto is considered to be investment grade by the Adviser. If there is a default by the other party to such a transaction, the Trust will have contractual remedies pursuant to the agreements related to the transaction. Swaps are traded in the over-the-counter market. The use of swaps is a highly specialized activity, which involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. If the Adviser is incorrect in its forecasts of market values, interest rates and other applicable factors, the total return performance of the Trust would be unfavorably affected.

Total return swaps

Total return swaps are contracts in which one party agrees to make payments of the total return from the designated underlying asset(s), which may include securities, baskets of securities, or securities indices during the specified period, in return for payments equal to a fixed or floating rate of interest or the total return from other designated underlying asset(s).

Interest rate swaps and forward rate contracts

Interest rate swaps involve the exchange by the Trust with another party of their respective commitments to pay or receive interest, e.g. , an exchange of fixed rate payments for floating rate payments. The Trust will only enter into interest rate swaps on a net basis, i.e., the two payment streams are netted out with the Trust receiving or paying, as the case may be, only the net amount of the two payments. The Trust may also enter forward rate contracts. Under these contracts, the buyer locks in an interest rate at a future settlement date. If the interest rate on the settlement date exceeds the lock rate, the buyer pays the seller the difference between the two rates. If the lock rate exceeds the interest rate on the settlement date, the seller pays the buyer the difference between the two rates. Any such gain received by the Trust would be taxable.

If the other party to an interest rate swap or forward rate contract defaults, the Trust’s risk of loss consists of the net amount of payments that the Trust is contractually entitled to receive that is in excess of collateral posted by the Trust’s counterparty in respect of such liability. The net amount of the excess, if any, of the Trust’s obligations over its entitlements will be maintained in a segregated account by the Trust’s custodian. The Trust will not enter into any interest rate swap or forward rate contract unless the claims-paying ability of the other party thereto is considered to be investment grade by the Adviser. If there is a default by the other party to such a transaction, the Trust will have contractual remedies pursuant to the agreements related to the transaction. These instruments are traded in the over-the-counter market.

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Futures transactions

The Trust may purchase and sell various kinds of financial futures contracts and options thereon to seek to hedge against changes in interest rates or for other risk management purposes. Futures contracts may be based on various debt securities and securities indices. Such transactions involve a risk of loss or depreciation due to unanticipated adverse changes in securities prices, which may exceed the Trust’s initial investment in these contracts. The Trust only will purchase or sell futures contracts or related options in compliance with the rules of the Commodity Futures Trading Commission. These transactions involve transaction costs. There can be no assurance that Eaton Vance’s use of futures will be advantageous to the Trust. Distributions by the Trust of any gains realized on the Trust’s transactions in futures and options on futures will be taxable.

Zero-coupon bonds

Some of the obligations in which the Trust invests may include so-called “zero-coupon” bonds, whose values generally are subject to greater fluctuation in response to changes in market interest rates than bonds that pay interest currently. Zero-coupon bonds are issued at a discount from face value and pay interest only at maturity rather than at intervals during the life of the security. The Trust is required to take into account imputed income from zero-coupon bonds on a current basis, even though it does not receive that income currently in cash. Because the Trust is required to distribute substantially all of its income for each taxable year, investments in zero-coupon bonds may require the Trust to sell investments to obtain cash needed to make income distributions.

When-issued securities

The Trust may purchase securities on a “when-issued” basis, which means that payment and delivery occur on a future settlement date. The price and yield of such securities are generally fixed on the date of commitment to purchase. However, the market value of the securities may fluctuate prior to delivery, and upon delivery the securities may be worth more or less than what the Trust agreed to pay for them. The Trust may be required to maintain a segregated account of liquid assets equal to outstanding purchase commitments. The Trust may also purchase instruments that give the Trust the option to purchase a municipal obligation when and if issued.

Investment company securities

The Trust may purchase common shares of closed-end investment companies that have investment objectives and policies similar to those of the Trust. In addition to providing tax-exempt income, such securities may provide capital appreciation. Such investments, which may also be leveraged and subject to similar risks as the Trust, will not exceed 10% of the Trust’s gross assets. These companies bear fees and expenses that the Trust will incur indirectly. The Trust will not invest in other investment companies that are affiliated with Eaton Vance.

Portfolio Turnover

The Trust may sell (and later purchase) securities in anticipation of a market decline (a rise in interest rates) or purchase (and later sell) securities in anticipation of a market rise (a decline in interest rates). Securities may also be purchased and sold based on their relative value in the marketplace. The Trust cannot accurately predict its portfolio turnover rate, but it is anticipated that the annual portfolio turnover rate will generally not exceed 100% (excluding turnover of securities having a maturity of one year or less). A 100% annual turnover rate could occur, for example, if all the securities held by the Trust were replaced once in a period of one year. A high turnover rate (100% or more) necessarily involves greater expenses to the Trust.

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RISK CONSIDERATIONS

No operating history

The Trust is a closed-end management investment company with no history of operations and is designed for long-term investors and not as a trading vehicle.

Investment and market risk

An investment in Common Shares is subject to investment risk, including the possible loss of the entire principal amount invested. An investment in Common Shares represents an indirect investment in the securities owned by the Trust, which will generally trade in the over-the-counter markets. The Common Shares at any point in time may be worth less than the original investment, even after taking into account any reinvestment of distributions. If the current national economic downturn deteriorates into a prolonged recession, the ability of municipalities to collect revenue and service their obligations could be materially and adversely affected.

Interest rate and income risk

The prices of municipal obligations tend to fall as interest rates rise. When interest rates decline, the value of municipal obligations held by the Trust can be expected to rise. Conversely, when interest rates rise, the value of municipal obligations held by the Trust can be expected to decline. Interest rate risk is the risk that the municipal securities in the Trust’s portfolio will decline in value because of increases in market interest rates. In typical market interest rate environments, the prices of longer-term municipal securities tend to fluctuate more in price in response to changes in market interest rates than prices of shorter-term municipal securities. A decline in the prices of the municipal obligations owned by the Trust would cause a decline in the net asset value of the Trust, which could adversely affect the trading price of the Trust’s Common Shares. This risk is usually greater among municipal obligations with longer maturities or durations. Although the Trust has no policy governing the maturities or durations of its investments, the Trust expects that initially it will invest in a portfolio of longer-term securities, generally with maturities of 10 years or greater. This means that the Trust’s Common Share net asset value and market price per share will fluctuate more in response to changes in market interest rates than if the Trust invested primarily in shorter-term municipal securities. The Trust may utilize certain strategies, including taking positions in futures or interest rate swaps and forward rate contracts, for the purpose of reducing the interest rate sensitivity of the portfolio and decreasing the Trust’s exposure to interest rate risk, although there can be no assurance that it will do so or that such strategies will be successful.

The income investors receive from the Trust is based primarily on the interest it earns from its investments, which can vary widely over the short- and long-term. If long-term interest rates drop, investors’ income from the Trust over time could drop as well if the Trust purchases securities with lower interest coupons.

The Trust anticipates initially incurring economic leverage by investing in residual interest bonds. Compared to similar fixed-rate municipal bonds, the value of these bonds will fluctuate to a greater extent in response to changes in prevailing long-term interest rates. Moreover, the income earned on residual interest municipal bonds will fluctuate in response to changes in prevailing short-term interest rates. Thus, when such bonds are held by the Trust, an increase in short- or long-term market interest rates may adversely affect the income received from such bonds or the net asset value of Trust shares.

Call and other reinvestment risks

If interest rates fall, it is possible that issuers of callable bonds with high interest coupons will “call” (or prepay) their bonds before their maturity date. If a call were exercised by the issuer during a period of

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declining interest rates, the Trust is likely to replace such called security with a lower yielding security. If that were to happen, it could decrease the Trust’s dividends and possibly could affect the market price of Common Shares. Similar risks exist when the Trust invests the proceeds from matured or traded municipal obligations at market interest rates that are below the Trust’s current earnings rate.

Credit risk

Credit risk is the risk that one or more municipal bonds in the Trust’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. 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 Trust’s net asset value or dividends. Securities rated in the fourth highest category (i.e., Baa by Moody’s or BBB by S&P or Fitch) are considered investment grade quality, but may have speculative characteristics.

Changes in the credit quality of the issuers of municipal obligations held by the Trust will affect the principal value of (and possibly the income earned on) such obligations. In addition, the value of such securities is affected by changes in general economic conditions and business conditions affecting the relevant economic sectors. Changes by Rating Agencies in their ratings of a security and in the ability of the issuer to make payments of principal and interest may also affect the value of the Trust’s investments. The amount of information about the financial condition of an issuer of municipal obligations may not be as extensive as that made available by corporations whose securities are publicly traded. The Trust may invest in unrated obligations for which Eaton Vance will make a credit quality determination for purposes of the Trust’s credit quality policy. To the extent that the Trust invests in such unrated obligations, the Trust’s credit quality will be more dependent on Eaton Vance’s credit analysis than if the Trust invested in only rated obligations.

The Trust may invest in municipal leases and participations in municipal leases. The obligation of the issuer to meet its obligations under such leases is often subject to the ongoing appropriation by a legislative body, on an annual or other basis, of funds for the payment of the obligations. Investments in municipal leases are thus subject to the risk that the legislative body will not make the necessary appropriation and the issuer will not otherwise be willing or able to meet its obligation.

Liquidity risk

The secondary market for some municipal obligations is less liquid than that for widely traded taxable debt obligations or widely traded municipal obligations. No established resale market exists for certain of the municipal obligations in which the Trust may invest. The Trust has no limitation on the amount of its assets that may be invested in securities that are not readily marketable or are subject to restrictions on resale. In certain situations, the Trust could find it more difficult to sell such securities at desirable times and/or prices. The Trust may not be able to readily dispose of such securities at prices that approximate those at which the Trust could sell such securities if they were more widely traded and, as a result of such illiquidity, the Trust may have to sell other investments or engage in borrowing transactions if necessary to raise cash to meet its obligations. In addition, the limited liquidity could affect the market price of the securities, thereby adversely affecting the Trust’s net asset value and ability to make distributions. At times, a portion of the Trust’s assets may be invested in securities as to which the Trust, by itself or together with other accounts managed by Eaton Vance and its affiliates, holds a major portion or all of such securities.

Municipal bond market risk

Investing in the municipal bond market involves certain risks. Certain securities in which the Trust will invest will not be registered with the Securities and Exchange Commission (“SEC”) or any state securities

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commission and will not be listed on any national securities exchange. The amount of public information available about the municipal obligations in the Trust’s portfolio is generally less than for corporate equities or bonds, and the investment performance of the Trust may therefore be more dependent on the analytical abilities of Eaton Vance than if the Trust were a stock fund or taxable bond fund.

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 municipalities to levy taxes. Issuers of municipal obligations might seek protection under the bankruptcy laws. In the event of bankruptcy of an issuer, the Trust could experience delays in collecting principal and interest to which it is entitled, and may obtain only a limited recovery or no recovery in such circumstances. To enforce its rights in the event of default in the payment of interest or repayment of principal, or both, the Trust may take possession of and manage the assets securing the issuer’s obligations on such securities, which may increase the Trust’s operating expenses. Any income derived from the Trust’s ownership or operation of such assets may not be tax-exempt.

Current economic conditions may increase the likelihood that a municipal issuer will be unable to make timely payments of interest and principal or will default or seek protection under the bankruptcy laws and may increase the likelihood of legislation that will adversely effect the Trust’s investments in municipal obligations. See “Investment objectives, policies and risks—Risk considerations—Current economic conditions—credit crisis liquidity and volatility risk.”

Below investment grade securities risk

Up to 30% of the Trust’s investments in municipal obligations may be, at the time of investment, rated below investment grade or, if unrated, deemed by the Adviser to be below investment grade. Such obligations are commonly called “junk bonds” and will have speculative characteristics in varying degrees. While such obligations may have some quality and protective characteristics, these characteristics can be expected to be offset or outweighed by uncertainties or major risk exposures to adverse conditions. Below investment grade municipal obligations involve a greater degree of credit, interest rate and market risk than investment grade municipal obligations. Below investment grade municipal obligations are subject to a greater risk of an issuer’s inability to meet principal and interest payments on the obligations and may also be subject to greater price volatility due to such factors as interest rate sensitivity, market perception of the creditworthiness of the issuer and general market liquidity. Below investment grade municipal obligations are considered predominantly speculative because of the credit risk of their issuers. While offering a greater potential opportunity for capital appreciation and higher yields, below investment grade municipal obligations typically entail greater potential price volatility and may be less liquid than investment grade municipal obligations. Issuers of below investment grade municipal obligations are more likely to default on their payments of interest and principal owed to the Trust, and such defaults will reduce the Trust’s net asset value and income distributions. The prices of these below investment grade obligations are more sensitive to negative developments than higher rated securities. Adverse economic conditions generally lead to a higher non-payment rate. In addition, below investment grade municipal obligations may lose significant value before a default occurs as the market adjusts to expected higher non-payment rates.

Increases in interest rates and changes in the economy may adversely affect the ability of issuers of lower grade municipal obligations to pay interest and to repay principal, to meet projected financial goals and to obtain additional financing. Issuers of below investment grade municipal obligations may be more

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adversely affected by a prolonged recession or continued deterioration of economic conditions. In the event that an issuer of securities held by the Trust experiences difficulties in the timely payment of principal or interest and such issuer seeks to restructure the terms of its borrowings, the Trust may incur additional expenses and may determine to invest additional assets with respect to such issuer or the project or projects to which the Trust’s portfolio securities relate. Further, the Trust may incur additional expenses to the extent that it is required to seek recovery upon a default in the payment of interest or the repayment of principal on its portfolio holdings, and the Trust may be unable to obtain full recovery thereof.

The Adviser seeks to minimize the risks of investing in below investment grade obligations through professional investment analysis, attention to current developments in interest rates and economic conditions, and industry and geographic diversification (if practicable). When the Trust invests in lower rated or unrated municipal obligations, the achievement of the Trust’s investment objectives is more dependent on the Adviser’s credit analysis than would be the case if the Trust were investing in municipal obligations rated investment grade. In evaluating the credit quality of a particular issue, whether rated or unrated, the Adviser will normally take into consideration, among other things, the financial resources of the issuer (or, as appropriate, of the guarantor or underlying source of funds for debt service), its sensitivity to economic conditions and trends, any operating history of and the community support for the facility financed by the issue, the ability of the issuer’s management and regulatory matters. The Adviser will attempt to reduce the risks of investing in the lowest investment grade quality, below investment grade quality and comparable unrated obligations through active portfolio management, credit analysis and attention to current developments and trends in the economy and the financial markets.

To the extent that there is no established market for some of the lower grade municipal obligations in which the Trust may invest, trading in such securities may be relatively inactive. The Adviser is responsible for determining the net asset value of the Trust, subject to the supervision of the Trust’s Board. During periods of reduced market liquidity and in the absence of readily available market quotations for lower grade municipal obligations held in the Trust’s portfolio, the ability of the Adviser to value the Trust’s securities becomes more difficult and the Adviser’s use of judgment may play a greater role in the valuation of the Trust’s securities due to the reduced availability of reliable objective data. The effects of adverse publicity and investor perceptions may be more pronounced for securities for which no established market exists as compared with the effects on securities for which a regular market does exist. Further, the Trust may have more difficulty selling such securities in a timely manner and at their stated value than would be the case for securities for which an established market does exist.

Municipal obligations held by the Trust that are initially rated below investment grade may subsequently be determined by the Adviser to be of investment grade quality for purposes of the Trust’s investment policies if the securities subsequently are backed by escrow accounts containing U.S. Government obligations. The Trust may retain in its portfolio an obligation that declines in quality, including defaulted obligations, if such retention is considered desirable by the Adviser. In the case of a defaulted obligation, the Trust may incur additional expense seeking recovery of its investment.

Insurance risk

The Trust may purchase municipal securities that are secured by insurance, bank credit agreements or escrow accounts. The credit quality of the companies that provide such credit enhancements will generally affect the value of those securities. Certain significant providers of insurance for municipal securities have recently incurred significant losses as a result of exposure to sub-prime mortgages and other lower credit quality investments that have experienced defaults or otherwise suffered credit

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deterioration. Such losses have reduced the insurers’ capital and may have called into question their continued ability to perform their obligations under such insurance if called upon in the future. While an insured municipal security will typically be deemed to have the rating of its insurer, if the insurer of a municipal security suffers a downgrade in its credit rating or the market discounts the value of the insurance provided, the rating of the underlying municipal security will generally be more relevant and the value of the municipal security would more closely, if not entirely, reflect such rating. In such a case, the value of insurance associated with a municipal security would decline and may not add any value. The insurance feature of a municipal security does not guarantee the full payment of principal and interest through the life of an insured obligation, the market value of the insured obligation or the net asset value of the Common Shares represented by such insured obligation.

Current economic conditions—credit crisis liquidity and volatility risk

The markets for many credit instruments, including municipal obligations, have experienced periods of illiquidity and extreme volatility since the latter half of 2007. The debt and equity capital markets in the United States have been negatively affected by significant write-offs in the financial services sector relating to subprime mortgages and the repricing of credit risk in the broader market, among other things. These events, along with the deterioration of the housing market, the failure of major financial institutions and the concerns that other financial institutions as well as the global financial system are experiencing severe economic distress have materially and adversely affected the broader financial and credit markets. General market uncertainty and consequent repricing risk have led to market imbalances of sellers and buyers, which in turn have resulted in significant valuation uncertainties in a variety of debt securities, including municipal obligations. In addition, during 2008, several major dealers of municipal bonds exited the market via acquisition or bankruptcy. These conditions resulted, and in many cases continue to result in, greater volatility, less liquidity, widening credit spreads and a lack of price transparency, with many debt securities remaining illiquid and of uncertain value. These market conditions may make valuation of some of the Trust’s municipal obligations uncertain and/or result in sudden and significant valuation increases or declines in its holdings. During times of reduced market liquidity, such as experienced recently, the Trust may not be able to sell securities readily at prices reflecting the underlying values of such securities or where carried on the Trust’s books. Sales of large blocks of securities by market participants that are seeking liquidity can further reduce security prices in an illiquid market. In addition, illiquidity and volatility in the credit markets may directly and adversely affect dividends on the Common Shares.

In response to the global economic downturn, governmental cost burdens may be reallocated among federal, state and local governments. The Federal Government, Federal Reserve and other governmental and regulatory bodies have taken and are considering additional actions to address the financial crisis. There can be no assurance as to what impact such actions will have on the markets for municipal obligations. 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 municipalities to levy taxes. Issuers of municipal obligations might seek protection under the bankruptcy laws.

The current economic and financial market conditions may continue to contribute to increased market volatility, may have long-term effects on the U.S. and worldwide financial markets; and may cause further economic uncertainties or deterioration in the United States and worldwide. The prolonged continuation or further deterioration of the current U.S. and global economic downturn could adversely affect the Trust’s investments. The Adviser does not know how long the financial markets will continue to be affected by these events and cannot predict the effects of these or similar events in the future on the U.S. economy, markets and securities in the Trust’s portfolio. The Adviser intends to monitor developments and seek to manage the Trust’s portfolio in a manner consistent with achieving the Trust’s investment objectives, but there can be no assurance that it will be successful in doing so.

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State specific risk

The Trust has no current intention to invest 25% or more of its gross assets (but may invest up to such amounts) in municipal obligations of issuers located in the same state (or U.S. territory), but reserves the flexibility to do so in the future. If the Trust invests 25% or more of its gross assets in any one state (or U.S. territory) the Trust may be more susceptible to adverse economic, political or regulatory occurrences affecting a particular state (or territory).

Up to 5% of the Trust’s investments in municipal obligations may be collateralized by the proceeds from class action or other litigation against the tobacco industry. Such municipal obligations are backed solely by expected revenues to be derived from lawsuits involving tobacco-related deaths and illnesses which were settled between certain states and American tobacco companies. Tobacco settlement bonds are secured by an issuing state’s proportionate share in the Master Settlement Agreement (“MSA”). The MSA is an agreement, reached out of court in November 1998 between 46 states and nearly all of the major U.S. tobacco manufacturers. Under the terms of the MSA, the actual amount of future settlement payments by tobacco manufacturers is dependent on many factors, including, but not limited to, annual domestic cigarette shipments, reduced cigarette consumption, increased taxes on cigarettes, inflation, financial capability of tobacco companies, continuing litigation and the possibility of tobacco manufacturer bankruptcy. Payments made by tobacco manufacturers could be negatively impacted if the decrease in tobacco consumption is significantly greater than the forecasted decline. See “Additional investment information and restrictions—State specific investments” in the Statement of Additional Information for additional information about tobacco settlement bonds and the MSA.

Residual interest bond risk

The Trust anticipates initially incurring economic leverage by investing in residual interest bonds. Residual interest bonds are securities that pay interest at rates that vary inversely with changes in prevailing short-term tax-exempt interest rates and provide the economic effect of leverage. Typically, such securities represent beneficial interests in a special purpose trust (sometimes called a “tender option bond trust”) formed by a third party sponsor for the purpose of holding municipal bonds. In general, income on residual interest bonds will decrease when short-term interest rates increase and increase when short-term interest rates decrease. Investments in residual interest bonds may subject the Trust to the risks of reduced or eliminated interest payments and losses of principal. In addition, residual interest bonds may increase or decrease in value at a greater rate than the underlying securities, which effectively leverages the Trust’s investment. The market value of such securities generally will be more volatile than that of conventional fixed rate securities.

Tender option bond trusts generally include liquidation triggers to protect the investor in the tender option bond. The trusts do not have recourse to the investors (such as the Trust) in the residual interest securities. However, in certain cases, at the discretion of the Adviser, the Trust may enter into a separate so-called shortfall and forbearance agreement with the sponsor of a tender option bond trust. The Trust generally may enter into such agreements (i) when the liquidity provider to the tender option bond trust requires such an agreement because the level of leverage in the tender option bond trust exceed the level that the liquidity provider is willing support absent such an agreement; and/or (ii) to seek to prevent the liquidity provider from collapsing the tender option bond trust in the event that the municipal obligation held in the trust has declined in value. Such an agreement would require the Trust to reimburse the sponsor upon termination of the trust the difference between the liquidation value of the bonds held in the trust and the principal amount due to the holders of floating rate interests. In such instances, the Trust may be at risk of loss that exceeds its investment in the residual interest securities. The Trust will segregate or earmark liquid assets with its custodian in accordance with 1940 Act Release No. 10666 (Apr. 18, 1979) to cover these obligations.

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Any economic effect of leverage through the Trust’s purchase of residual interest bonds will create an opportunity for increased Share net income and returns, but will also create the possibility that the Trust’s long-term returns will be diminished if the cost of leverage exceeds the return on the bonds purchased with leverage by the Trust. See “Investment objectives, policies and risks—Risk considerations—Leverage risk.”

The amount of fees paid to Eaton Vance for investment advisory services will be higher if the Trust uses leverage because the fees will be calculated based on the Trust’s average daily gross assets, which may create an incentive for the Adviser to employ leverage. Gross assets include assets financed through the creation of tender option bond trusts, the issuance of preferred equity, borrowings and other forms of leverage, which may create a conflict of interest between Eaton Vance and the Common Shareholders.

Residual interest bonds have varying degrees of liquidity based upon the liquidity of the securities deposited in the associated tender option bond trust and other factors. The market price of residual interest bonds is more volatile than the underlying securities due to leverage. In circumstances where the Trust has a need for cash and the securities in a tender option bond trust are not actively trading, the Trust may be required to sell its residual interest bonds at less than favorable prices, or liquidate other Trust portfolio holdings.

Risks of municipal leases and certificates of participation

The Trust may invest in municipal leases and certificates of participation that involve special risks not normally associated with general obligations or revenue obligations. Municipal leases are obligations in the form of a lease, installment purchase or conditional sales contract (which typically provide for the title to the leased asset to pass to the governmental issuer), issued by state or local governments to acquire equipment and facilities. Interest income from such obligations is generally exempt from local and state taxes in the state of issuance. The issuer’s obligations under such leases is often subject to the ongoing appropriation by a legislative body, on an annual or other basis, of funds for the payment thereof. Investments in municipal leases are thus subject to the risk that the legislative body will not make the necessary appropriation and the issuer will not otherwise be willing or able to meet its obligation.

Market price of common shares

The Trust is a closed-end management investment company with no history of operations and is designed primarily for long-term investors and not as a trading vehicle. The shares of closed-end management investment companies often trade at a discount from their net asset value, and the Common Shares may likewise trade at a discount from net asset value. The trading price of the Trust’s Common Shares may be less than the initial public offering price, creating a risk of loss for investors purchasing in the initial public offering of the Common Shares. This market price risk may be greater for investors who sell their Common Shares within a relatively short period after completion of this offering.

Inflation risk/deflation risk

Inflation risk is the risk that the value of assets or income from 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 thereon can decline. In addition, during periods of rising inflation, short-term interest rates and the Trust’s cost of leverage would likely increase, reducing returns to Common Shareholders to the extent that such increased cost is not offset by commensurately higher income. Deflation risk is the risk that prices throughout the economy decline over time—the opposite of inflation. Deflation may have an adverse affect on the creditworthiness of issuers and may make issuer defaults more likely, which may result in a decline in the value of the Trust’s investments.

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Leverage risk

The Trust anticipates using leverage to seek to enhance returns, initially by investing in residual interest bonds. The Trust will not utilize leverage in excess of 15% of its gross assets. Residual interest bonds are securities that pay interest at rates that vary inversely with changes in prevailing short-term tax-exempt interest rates and provide the economic effect of leverage. Although the Trust has no current intention to do so, the Trust is authorized also to utilize leverage through the issuance of preferred shares and/or borrowings, including the issuance of debt securities. The Trust may borrow for temporary, emergency or other purposes as permitted by the 1940 Act. There can be no assurance a leveraging strategy will be successful during any period in which it is employed. Leverage creates risks for Common Shareholders, including the likelihood of greater volatility of net asset value and market price of the Common Shares and the risk that fluctuations in leverage costs will affect income and return to Common Shareholders. To the extent the income derived from securities purchased with proceeds received from leverage exceeds the cost of leverage, the Trust’s distributions may be greater than if leverage had not been used. Conversely, if the income from the securities purchased with such proceeds are not sufficient to cover the cost of leverage, the amount available for distribution to Common Shareholders will be less than if leverage had not been used. In the latter case, Eaton Vance, in its best judgment, may nevertheless determine to maintain the Trust’s leveraged position if it deems such action to be appropriate. The costs of an offering of preferred shares, borrowings and other forms of leverage would be borne by Common Shareholders and consequently would result in a reduction of the net asset value of Common Shares.

In addition, the fee paid to Eaton Vance will be calculated on the basis of the Trust’s average daily gross assets, including assets purchased using proceeds from the issuance of preferred shares, borrowings and other forms of leverage, including investments in residual interest bonds, so the fee will be higher when leverage is utilized, which may create an incentive for the Adviser to employ leverage. If the Trust utilizes leverage by issuing preferred shares or debt, holders of preferred shares and the holders of any debt issued by the Trust do not bear the investment advisory fee. Therefore, Common Shareholders bear the portion of the investment advisory fee attributable to the assets purchased with the proceeds of leverage.

Derivatives risk

In addition to investing in residual interest bonds, the Trust may invest without limitation in other derivative instruments (which are instruments that derive their value from another instrument, security or index) acquired for hedging purposes. The loss on derivative instruments (other than purchased options) may substantially exceed an investment in these instruments. Derivative transactions, including options on securities and securities indices and other transactions in which the Trust may engage (such as futures contracts and options thereon, swaps and short sales), may subject the Trust to increased risk of principal loss due to unexpected movements in securities prices and interest rates, and imperfect correlations between the Trust’s securities holdings and indices upon which derivative transactions are based. Derivatives can be illiquid, may disproportionately increase losses, and may have a potentially large impact on the Trust’s performance. The Trust also will be subject to credit risk with respect to the counterparties to any over-the-counter derivatives contracts entered into by the Trust. If a counterparty becomes bankrupt or otherwise fails to perform its obligations under a derivative contract due to financial difficulties, the Trust may experience significant delays in obtaining any recovery under the derivative contract in a bankruptcy or other reorganization proceeding. The Trust may obtain only a limited recovery or no recovery in such circumstances. Derivatives may disproportionately increase losses and have a potentially large negative impact on the Trust’s performance.

Counterparty risk

Changes in the credit quality of the companies that serve as the Trust’s counterparties with respect to its derivatives positions and liquidity providers for the Trust’s residual interest bonds or other investments supported by another party’s credit will affect the value of those instruments. Certain entities that have

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served as counterparties in the municipals markets have recently incurred significant financial hardships including bankruptcy and material loss of credit standing as a result of exposure to sub-prime mortgages and other investments that have experienced defaults or otherwise suffered extreme credit deterioration. As a result, such hardships have reduced these entities’ capital and called into question their continued ability to perform their obligations. By using derivatives or other instruments that expose the Trust to counterparties, the Trust assumes the risk that its counterparties could experience future financial hardship.

Tax risk

The value of the Trust’s investments and its net asset value may be adversely affected by changes in tax rates and policies. Because interest income from municipal obligations normally is not subject to regular federal income taxation, the attractiveness of municipal obligations in relation to other investment alternatives is affected by changes in federal income tax rates or changes in the tax-exempt status of interest income from municipal obligations. Any proposed or actual changes in such rates or exempt status, therefore, can significantly affect the demand for and supply, liquidity and marketability of municipal obligations. This could in turn affect the Trust’s net asset value and ability to acquire and dispose of municipal obligations at desirable yield and price levels. To the extent that the Trust receives income from municipal obligations subject to the federal alternative minimum tax, a portion of the dividends paid by the Trust, although otherwise exempt from federal income tax, would be taxable to its Common Shareholders to the extent that their tax liability is determined under the federal alternative minimum tax. The Trust is not a suitable investment for individual retirement accounts, for other tax-exempt or tax-deferred accounts or for investors who are otherwise indifferent to the federal income tax consequences of their investments. See “Federal income tax matters.”

Management risk

The Trust is subject to management risk because it is an actively managed portfolio. Eaton Vance and the individual portfolio managers invest the assets of the Trust as they deem appropriate in implementing the Trust’s investment strategy. Accordingly, the success of the Trust depends upon the investment skills and analytical abilities of Eaton Vance and the individual portfolio managers to develop and effectively implement strategies that achieve the Trust’s investment objectives. There is no assurance that Eaton Vance and the individual portfolio managers will be successful in developing and implementing the Trust’s investment strategy. Subjective decisions made by Eaton Vance and the individual portfolio managers may cause the Trust to incur losses or to miss profit opportunities on which it could otherwise have capitalized.

Market disruption

The war in Iraq, instability in the Middle East and terrorist attacks around the world may adversely affect the performance of U.S. and worldwide financial markets and may cause economic uncertainties in the U.S. and elsewhere. The Trust cannot predict the future course of world affairs or the effects of significant future events on the U.S. economy and securities markets. Given these risks, an investment in the Common Shares may not be appropriate for all investors. You should carefully consider your ability to assume these risks before making an investment in the Trust.

Anti-takeover provisions

The Trust’s Agreement and Declaration of Trust includes provisions that could have the effect of limiting the ability of other persons or entities to acquire control of the Trust or to change the composition of the Board. See “Description of capital structure—Anti-takeover provisions in the Declaration of Trust.”

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Management of the Trust

BOARD OF TRUSTEES

The management of the Trust, including general supervision of the duties performed by the Adviser under the Advisory Agreement (as defined below), is the responsibility of the Trust’s Board under the laws of The Commonwealth of Massachusetts and the 1940 Act.

THE ADVISER

Eaton Vance acts as the Trust’s investment adviser under an Investment Advisory and Administrative Agreement (the “Advisory Agreement”). The Adviser’s principal office is located at Two International Place, Boston, Massachusetts 02110. Eaton Vance, its affiliates and predecessor companies have been managing assets of individuals and institutions since 1924 and of investment companies since 1931. Eaton Vance and its affiliates serve as investment advisers to investment companies and individual and institutional clients. As of March 31, 2009, Eaton Vance and its affiliates managed approximately $119.3 billion of assets, including 61 municipal bond funds with combined assets of about $23.6 billion. Eaton Vance is a direct wholly-owned subsidiary of Eaton Vance Corp., a publicly-held holding company, which through its subsidiaries and affiliates engages primarily in investment management and administration.

Eaton Vance employs 24 personnel in its municipal bond department, including eight portfolio managers, five traders and nine research analysts. Eaton Vance was one of the first advisory firms to manage a registered municipal bond investment company, and has done so continuously since 1978. Eaton Vance and certain of its subsidiaries currently manage ten national municipal investment companies, 50 single state municipal investment companies, and one money market municipal investment company, with assets of about $23.6 billion. Of the municipal income funds managed by Eaton Vance, 20 are closed-end funds.

Under the general supervision of the Trust’s Board, Eaton Vance will act as investment adviser for and manage the investment and reinvestment of the assets of the Trust and administer its affairs. As investment adviser to the Trust, Eaton Vance will furnish continuously an investment program and will determine from time to time what securities and other investments will be acquired, disposed of or exchanged and what portion of the Trust’s assets will be held uninvested, subject always to the applicable restrictions of the Declaration of Trust, By-Laws and registration statement of the Trust under the 1940 Act. Eaton Vance will furnish for the use of the Trust office space and all necessary office facilities, equipment and personnel for servicing the investments of the Trust and for administering its affairs and will pay the salaries and fees of all officers and Trustees of the Trust who are members of Eaton Vance’s organization and all personnel of Eaton Vance performing services relating to research and investment and administrative activities. In return for these investment advisory services, facilities and payments, the Trust has agreed to pay the Adviser as compensation under the Advisory Agreement a fee in the amount of 0.60% of the Trust’s average daily gross assets up to and including $1.5 billion, and 0.59% of the Trust’s average daily gross assets in excess of $1.5 billion. For purposes of this calculation, “gross assets” of the Trust shall mean total assets of the Trust, including any form of leverage, minus all accrued expenses incurred in the normal course of operations, but not excluding any liabilities or obligations attributable to leverage obtained through (i) indebtedness of any type (including, without limitation, borrowing through a credit facility or the issuance of debt securities), (ii) the issuance of preferred stock or other similar preference securities, (iii) the reinvestment of collateral received for securities loaned in accordance with the Trust’s investment objectives and policies, and/or (iv) any other means, including investments in residual interest bonds.

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Management of the Trust

A discussion regarding the basis for the Board approval of the Trust’s Investment Advisory and Administration Agreement will be available in the Trust’s initial report to shareholders.

Cynthia Clemson and Thomas Metzold are the portfolio managers of the Trust and are responsible for day-to-day management of the Trust’s investments. Each of Ms. Clemson and Mr. Metzold also manages other Eaton Vance portfolios, has been an Eaton Vance portfolio manager for more than 5 years, and is a Vice President of Eaton Vance. The Statement of Additional Information provides additional information about the portfolio managers’ compensation, other accounts managed by the portfolio managers, and the portfolio managers’ ownership of securities in the Trust.

The Trust and the Adviser have adopted a Code of Ethics relating to personal securities transactions. The Code permits Adviser personnel to invest in securities (including securities that may be purchased or held by the Trust) for their own accounts, subject to certain pre-clearance, reporting and other restrictions and procedures contained in such Code of Ethics.

THE ADMINISTRATOR

Eaton Vance serves as administrator of the Trust but currently receives no compensation for providing administrative services to the Trust. Under the Advisory Agreement, Eaton Vance is responsible for managing the business affairs of the Trust, subject to the supervision of the Trust’s Board. Eaton Vance will furnish to the Trust all office facilities, equipment and personnel for administering the affairs of the Trust. Eaton Vance’s administrative services include recordkeeping, preparation and filing of documents required to comply with federal and state securities laws, supervising the activities of the Trust’s custodian and transfer agent, providing assistance in connection with the Trustees’ and shareholders’ meetings, providing service in connection with any repurchase offers and other administrative services necessary to conduct the Trust’s business.

Determination of net asset value

The net asset value per share of the Trust is determined no less frequently than daily, on each day that the New York Stock Exchange (the “NYSE”) is open for trading, as of the close of regular trading on the Exchange (normally 4:00 p.m. New York time). The Trust’s net asset value per share is determined by State Street Bank and Trust Company, in the manner authorized by the Trustees of the Trust. Net asset value is computed by dividing the value of the Trust’s total assets, less its liabilities, by the number of shares outstanding.

Inasmuch as the market for municipal obligations is a dealer market with no central trading location or continuous quotation system, it is not feasible to obtain last transaction prices for most municipal obligations held by the Trust, and such obligations, including those purchased on a when-issued basis, will normally be valued on the basis of valuations furnished by a pricing service. The pricing service uses factors which may include: information with respect to transactions in bonds, quotations from bond dealers, market transactions in comparable securities, various relationships between securities, and yield to maturity in determining value. Taxable obligations, if any, are normally valued on the basis of valuations furnished by a pricing service. Open futures positions on debt securities are valued at closing settlement prices on the valuation day, unless such price does not reflect the fair value of the contract, in which case the positions will be valued in accordance with the Fund’s procedures.

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Distributions

The Trust intends to make monthly distributions of net investment income. The Trust will distribute annually any net short-term capital gain and any net capital gain (which is the excess of net long-term capital gain over net short-term capital loss). Distributions to Common Shareholders cannot be assured, and the amount of each monthly distribution is likely to vary. Initial distributions to Common Shareholders are expected to be declared approximately 45 days and are expected to be paid approximately 60 days after the completion of this offering. See “Description of capital structure.”

Federal income tax matters

The following discussion of federal income tax matters is based on the advice of K&L Gates LLP, counsel to the Trust.

The Trust intends to invest a sufficient portion of its assets in tax-exempt municipal obligations so that it will be permitted to pay “exempt-interest dividends” (as defined under applicable federal income tax law). Each distribution of exempt-interest dividends, whether paid in cash or reinvested in additional Common Shares, ordinarily will constitute income exempt from regular federal income tax. Furthermore, exempt-interest dividends are included in determining what portion, if any, of a person’s social security and railroad retirement benefits will be includible in gross income subject to regular federal income tax. Distributions of any taxable net investment income and net short-term capital gain are taxable as ordinary income. Distributions of the Trust’s net capital gain (“capital gain dividends”), if any, are taxable to Common Shareholders as long-term capital gains, regardless of the length of time Common Shares have been held by Common Shareholders. Distributions, if any, in excess of the Trust’s earnings and profits will first reduce the adjusted tax basis of a holder’s Common Shares and, after that basis has been reduced to zero, will constitute capital gains to the Common Shareholder (assuming the Common Shares are held as a capital asset). See below for a summary of the maximum tax rates applicable to capital gains (including capital gain dividends). Interest on indebtedness incurred or continued by a Common Shareholder to purchase or carry Common Shares is not deductible for federal income tax purposes if the Trust distributes exempt-interest dividends during the Common Shareholder’s taxable year.

The Trust will inform Common Shareholders of the source and tax status of all distributions promptly after the close of each calendar year.

Selling Common Shareholders will generally recognize gain or loss in an amount equal to the difference between the Common Shareholder’s adjusted tax basis in the Common Shares and the amount received. If the Common Shares are held as a capital asset, the gain or loss will be a capital gain or loss. For individuals and non-corporate taxpayers, short-term capital gain is currently taxed at rates applicable to ordinary income (currently at a maximum of 35%) while long-term capital gain generally is taxed at a maximum rate of 15%. Current law taxes both long-term and short-term capital gain of corporations at the rates applicable to ordinary income (currently at a maximum of 35%). Absent further legislation, the maximum 15% rate on long-term capital gains will increase to 20% for taxable years beginning after December 31, 2010. Any loss on a disposition of Common Shares held for six months or less will be treated as a long-term capital loss to the extent of any capital gain dividends received with respect to those Common Shares, and will be disallowed to the extent of any exempt-interest dividends received with respect to those Common Shares. For purposes of determining whether Common Shares have been

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held for six months or less, the holding period is suspended for any periods during which the Common Shareholder’s risk of loss is diminished as a result of holding one or more other positions in substantially similar or related property, or through certain options or short sales. Any loss realized on a sale or exchange of Common Shares will be disallowed to the extent those Common Shares are replaced by other Common Shares within a period of 61 days beginning 30 days before and ending 30 days after the date of disposition of the Common Shares (which could occur, for example, if the Common Shareholder is a participant in the Plan (as defined below)). In that event, the basis of the replacement Common Shares will be adjusted to reflect the disallowed loss.

Distributions by the Trust of net tax-exempt interest income that are properly designated as “exempt-interest dividends” may be treated by Common Shareholders as interest excludable from gross income under Section 103(a) of the Code. In order for the Trust to be entitled to pay exempt-interest dividends to its Common Shareholders, the Trust intends to satisfy certain requirements, including the requirement that, at the close of each quarter of its taxable year, at least 50% of the value of its gross assets consists of obligations the interest on which is exempt from regular federal income tax under Code Section 103(a). Interest on certain municipal obligations is treated as a tax preference item for purposes of the alternative minimum tax. Common Shareholders of the Trust are required to report tax-exempt interest on their federal income tax returns.

Any interest on indebtedness incurred or continued to purchase or carry the Trust’s Common Shares to which exempt-interest dividends are allocated is not deductible. Under certain applicable rules, the purchase or ownership of Common Shares may be considered to have been made with borrowed funds even though such funds are not directly used for the purchase or ownership of the Common Shares.

An investor should be aware that if Common Shares are purchased shortly before the record date for any taxable dividend (including a capital gain dividend), the purchase price likely will reflect the value of the dividend and the investor then would receive a taxable distribution likely to reduce the trading value of such Common Shares, in effect resulting in a taxable return of some of the purchase price. Taxable distributions to individuals and certain other non-corporate Common Shareholders, including those who have not provided their correct taxpayer identification number and other required certifications, may be subject to “backup” federal income tax withholding at the rate of 28%.

Dividends declared by the Trust in October, November or December and paid during the following January may be treated as having been received by Common Shareholders in the year the distributions were declared.

The Trust intends to elect to be treated and to qualify each year as a regulated investment company (“RIC”) under Subchapter M of the Code. In order to qualify as a RIC, the Trust must satisfy certain requirements regarding the sources of its income, the diversification of its assets and the distribution of its income. As a RIC, the Trust is not expected be subject to federal income tax provided that it meets certain distribution requirements. If the Trust retains any net capital gain or investment company taxable income, it will be subject to tax at regular corporate rates on the amount retained. If the Trust retains any net capital gain, it may designate the retained amount as undistributed capital gains in a notice to its Common 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; (ii) will be entitled to credit their proportionate shares of the tax paid by the Trust on such undistributed amount against their federal income tax liabilities, if any; and (iii) will be entitled to claim refunds to the extent the credit exceeds such liabilities. For federal income tax purposes, the tax basis of Common Shares owned by a Common Shareholder of the Trust will be increased by an amount equal to the difference between the amount of undistributed capital gains included in the

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Common Shareholder’s gross income and the tax deemed paid by the Common Shareholder under clause (ii) of the preceding sentence.

The Trust may invest in other securities the federal income tax treatment of which is uncertain or subject to recharacterization by the Internal Revenue Service. To the extent the tax treatment of such securities or their income differs from the tax treatment expected by the Trust, it could affect the timing or character of income recognized by the Trust, requiring the Trust to purchase or sell securities, or otherwise change its portfolio, in order to comply with the tax rules applicable to regulated investment companies under the Code. In addition, certain of the Trust’s investment practices are subject to special and complex federal income tax provisions that may, among other things, (i) disallow, suspend or otherwise limit the allowance of certain losses or deductions, (ii) convert lower taxed long-term capital gains into higher taxed short-term capital gains or ordinary income, (iii) convert ordinary loss or a deduction into capital loss (the deductibility of which is more limited), (iv) cause the Trust to recognize income or gain without a corresponding receipt of cash, (v) adversely affect the time as to when a purchase or sale of stock or securities is deemed to occur, (vi) adversely alter the characterization of certain complex financial transactions and (vii) produce income that will not qualify as good income for purposes of the 90% annual gross income requirement described above.

If the Trust issues preferred shares, the Trust will designate dividends made to holders of Common Shares and to holders of those preferred shares in accordance with each class’s proportionate share of each item of Trust income. A class’s proportionate share of a particular type of income for a year is determined according to the percentage of total dividends paid by the RIC during that year to the class.

The foregoing briefly summarizes some of the important federal income tax consequences to Common Shareholders of investing in Common Shares, reflects the federal tax law as of the date of this prospectus, and does not address special tax rules applicable to certain types of investors, such as corporate and foreign investors. For more information, please see the Statement of Additional Information under “Federal income tax matters.” Investors should consult their tax advisors regarding other federal, state or local tax considerations that may be applicable in their particular circumstances, including federal and state alternative minimum tax as well as any proposed tax law changes.

Dividend reinvestment plan

The Trust has established a dividend reinvestment plan (the “Plan”). Under the Plan, unless a Common Shareholder elects to receive distributions in cash, all distributions will be automatically reinvested in additional Common Shares. American Stock Transfer & Trust Company (“AST” or the “Plan Agent”) serves as agent for the Common Shareholders in administering the Plan. Common Shareholders who elect not to participate in the Plan will receive all Trust distributions in cash paid by check mailed directly to the Common Shareholder of record (or, if the Common Shares are held in street or other nominee name, then to the nominee) by AST, as disbursing agent. Participation in the Plan is completely voluntary and may be terminated or resumed at any time without penalty by written notice if received by the Plan Agent prior to any distribution record date.

Common Shares will be acquired by the Plan Agent or an independent broker-dealer for the participants’ accounts, depending upon the circumstances described below, either (i) through receipt of additional previously authorized but unissued Common Shares from the Trust (“newly issued Common Shares”) or (ii) by purchase of outstanding Common Shares on the open market (“open-market purchases”) on the NYSE or elsewhere. If, on the payment date for the distribution, the net asset value per Common Share is

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equal to or less than the market price per Common Share plus estimated brokerage commissions (such condition being referred to herein as “market premium”), the Plan Agent will invest the distribution amount in newly issued Common Shares on behalf of the participants. The number of newly issued Common Shares to be credited to each participant’s account will be determined by dividing the dollar amount of the distribution by the net asset value per Common Share on the date the Common Shares are issued, provided that the maximum discount from the then current market price per Common Share on the date of issuance may not exceed 5%. If on the distribution payment date the net asset value per Common Share is greater than the market value plus estimated brokerage commissions (such condition being referred to herein as “market discount”), the Plan Agent will invest the distribution amount in Common Shares acquired on behalf of the participants in open-market purchases.

In the event of a market discount on the distribution payment date, the Plan Agent will have up to 30 days after the distribution payment date to invest the distribution amount in Common Shares acquired in open-market purchases. If, before the Plan Agent has completed its open-market purchases, the market price of a Common Share exceeds the net asset value per Common Share, the average per Common Share purchase price paid by the Plan Agent could exceed the net asset value of the Common Shares, resulting in the acquisition of fewer Common Shares than if the distribution had been paid in newly issued Common Shares on the distribution payment date. Therefore, the Plan provides that if the Plan Agent is unable to invest the full distribution amount in open-market purchases during the purchase period or if the market discount shifts to a market premium during the purchase period, the Plan Agent will cease making open-market purchases and will invest the uninvested portion of the distribution amount in newly issued Common Shares.

The Plan Agent maintains all Common Shareholders’ accounts in the Plan and furnishes written confirmation of all transactions in the accounts, including information needed by Common Shareholders for tax records. Common Shares in the account of each Plan participant will be held by the Plan Agent on behalf of the Plan participant, and each Common Shareholder’s proxy will include those Common Shares purchased or received pursuant to the Plan. The Plan Agent will forward all proxy solicitation materials to participants and vote proxies for Common Shares held pursuant to the Plan in accordance with the instructions of the participants. In the case of Common Shareholders such as banks, brokers or 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 Common Shareholder’s name and held for the account of beneficial owners who participate in the Plan.

There will be no brokerage charges with respect to Common Shares issued directly by the Trust as a result of distributions payable either in Common Shares or in cash. However, each Plan participant will pay a pro rata share of brokerage commissions incurred with respect to the Plan Agent’s open-market purchases in connection with the reinvestment of distributions.

Common Shareholders participating in the Plan may receive benefits not available to Common Shareholders not participating in the Plan. If the market price (plus commissions) of the Common Shares is above their net asset value, participants in the Plan will receive Common Shares of the Trust purchased at a discount to market price and having a current value that exceeds the cash distributions they would have otherwise received on their Common Shares. If the market price (plus commissions) of the Common Shares is below their net asset value, Plan participants will receive Common Shares with a net asset value that exceeds the cash distributions they would have otherwise received on their Common Shares. There may, however, be insufficient Common Shares available in the market at prices below net asset value to satisfy the Plan’s requirements, in which case the Plan Agent will acquire newly issued Common Shares. Also, since the Trust does not redeem its Common Shares, the price on resale of Common Shares may be more or less than their net asset value.

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Experience under the Plan may indicate that changes are desirable. Accordingly, upon 30 days’ notice to Plan participants, the Trust reserves the right to amend or terminate the Plan. A Plan participant will be charged a $5.00 service charge and pay brokerage charges whenever he or she directs the Plan Agent to sell Common Shares held in a distribution reinvestment account.

All correspondence concerning the Plan should be directed to the Plan Agent at American Stock Transfer & Trust Company, P.O. Box 922, Wall Street Station, New York, NY 10269-0560. Please call 1-866-706-0514 between the hours of 9:00 a.m. and 5:00 p.m. Eastern Time if you have questions regarding the Plan.

Description of capital structure

The Trust is an unincorporated business trust established under the laws of The Commonwealth of Massachusetts by the Declaration of Trust. The Declaration of Trust provides that the Trustees of the Trust may authorize separate classes of shares of beneficial interest. The Trustees have authorized an unlimited number of Common Shares. The Trust intends to hold annual meetings of shareholders in compliance with the requirements of the NYSE.

COMMON SHARES

The Declaration of Trust permits the Trust to issue an unlimited number of full and fractional Common Shares of beneficial interest, $0.01 par value per Share. Each Share represents an equal proportionate interest in the assets of the Trust with each other Share in the Trust. Holders of Common Shares will be entitled to the payment of dividends when, as and if declared by the Board. The 1940 Act or the terms of any borrowings may limit the payment of dividends to the holders of Common Shares. Each whole Share shall be entitled to one vote and each fractional share shall be entitled to a proportionate fractional vote as to matters on which it is entitled to vote pursuant to the terms of the Declaration of Trust on file with the SEC. Upon liquidation of the Trust, after paying or adequately providing for the payment of all liabilities of the Trust, and upon receipt of such releases, indemnities and refunding agreements as they deem necessary for their protection, the Trustees may distribute the remaining assets of the Trust among the holders of the Common Shares. The Declaration of Trust provides that shareholders are not liable for any liabilities of the Trust, and provides for the indemnification by the Trust or by any Class or Series thereof of the Shareholders, Trustees, officers and employees of the Trust and of such other Persons as the Trustees in the exercise of their discretion may deem appropriate or desirable, whether in the By-Laws or by contract, vote or other action of the Trustees. Although shareholders of an unincorporated business trust established under Massachusetts law, in certain limited circumstances, may be held personally liable for the obligations of the Trust as though they were general partners, the provisions of the Declaration of Trust described in the foregoing sentence make the likelihood of such personal liability remote.

The Trust has no present intention of offering additional Common Shares, except as described herein. Other offerings of its Common Shares, if made, will require approval of the Board. The Common Shares have no preemptive rights.

The Trust generally will not issue Share certificates. However, the Trustees may authorize the issuance of certificates of beneficial interest to evidence the ownership of Common Shares.

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REPURCHASE OF COMMON SHARES AND OTHER DISCOUNT MEASURES

Because shares of closed-end management investment companies frequently trade at a discount to their net asset values, the Board has determined that from time to time it may be in the interest of Common Shareholders for the Trust to take corrective actions. The Board, in consultation with Eaton Vance, will review at least annually the possibility of open market repurchases and/or tender offers for the Common Shares and will consider such factors as the market price of the Common Shares, the net asset value of the Common Shares, the liquidity of the assets of the Trust, effect on the Trust’s expenses, whether such transactions would impair the Trust’s status as a regulated investment company or result in a failure to comply with any applicable asset coverage requirements, general economic conditions and such other events or conditions which may have a material effect on the Trust’s ability to consummate such transactions. There are no assurances that the Board will, in fact, decide to undertake either of these actions or if undertaken, that such actions will result in the Trust’s Common Shares trading at a price which is equal to or approximates their net asset value. In recognition of the possibility that the Common Shares might trade at a discount to net asset value and that any such discount may not be in the interest of Common Shareholders, the Board, in consultation with Eaton Vance, from time to time may review possible actions to reduce any such discount.

EFFECTS OF LEVERAGE

The Trust anticipates using leverage to seek to enhance returns, initially by investing in residual interest bonds. As discussed above, the Trust will not utilize economic leverage in excess of 15% of its gross assets. Although the Trust has no current intention to do so, the Trust is authorized also to utilize leverage through the issuance of preferred shares and/or borrowings, including the issuance of debt securities. The Trust may borrow for temporary, emergency or other purposes as permitted by the 1940 Act. In the event that the Trust determines in the future to utilize alternative or additional forms of leverage, there can be no assurance that such strategy would be successful during any period in which it is employed. Leverage creates risks for Common Shareholders, including the likelihood of greater volatility of net asset value and market price of the Common Shares and the risk that fluctuations in leverage costs may affect the income and return to Common Shareholders. To the extent the amounts available for distribution derived from securities purchased with proceeds received from leverage exceed the cost of leverage, the Trust’s distributions would be greater than if leverage had not been used. Conversely, if the amounts available for distribution derived from securities purchased with such proceeds are not sufficient to cover the cost of leverage, distributions to Common Shareholders would be less than if leverage had not been used. In the latter case, Eaton Vance, in its best judgment, may nevertheless determine to maintain the Trust’s leveraged position if it deems such action to be appropriate. The costs of an offering of preferred shares and/or a borrowing program would be borne by Common Shareholders and consequently would result in a reduction of the net asset value of Common Shares.

In addition, the fee paid to Eaton Vance will be calculated on the basis of the Trust’s average daily gross assets, including assets purchased with any forms of leverage, so the fees would be higher if leverage is utilized. In this regard, holders of preferred shares would not bear the investment advisory fee. Rather, Common Shareholders would bear the portion of the investment advisory fee attributable to the assets purchased with the proceeds of the preferred shares offering.

ANTI-TAKEOVER PROVISIONS IN THE DECLARATION OF TRUST

The Declaration of Trust includes provisions that could have the effect of limiting the ability of other entities or persons to acquire control of the Trust or to change the composition of its Board, and could

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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 Trust. These provisions may have the effect of discouraging attempts to acquire control of the Trust, which attempts could have the effect of increasing the expenses of the Trust and interfering with the normal operation of the Trust. The Board is divided into three classes, with the term of one class expiring at each annual meeting of Common Shareholders. At each annual meeting, one class of Trustees is elected to a three-year term. This provision could delay for up to two years the replacement of a majority of the Board. A Trustee may be removed from office only for cause by a written instrument signed by the remaining Trustees or by holders of record of not less than two-thirds of the outstanding shares of beneficial interest in the Trust either by declaration in writing filed with the custodian of the securities of the trust or by votes cast in person or by proxy at a meeting called for the purpose.

In addition, the Declaration of Trust requires the favorable vote of the holders of at least 75% of the outstanding shares of common stock of the Trust then entitled to vote to approve, adopt or authorize certain transactions with 5%-or-greater holders of such shares and their associates, except where (i) the Trustees by resolution have approved a memorandum of understanding with such holders with respect to and substantially consistent with such transaction, or (ii) the transaction is with a Person of which a majority of the outstanding shares of all classes of stock normally entitled to vote in the election of directors is owned of record or beneficially by the Trust and its subsidiaries. For purposes of these provisions, the term “Principal Shareholder” shall mean any Person which is the beneficial owner, directly or indirectly, of more than five percent (5%) of the issued and outstanding shares of the Trust or of any class of shares and shall include any “affiliate” or “associate,” as such terms are defined in Rule 12b-2 of the General Rules and Regulations under the Securities Exchange Act of 1934. The transactions subject to these special approval requirements are: (i) the merger or consolidation of the Trust or any subsidiary of the Trust with or into any Principal Shareholder; (ii) the issuance of any securities of the Trust to any Principal Shareholder for cash; (iii) the sale, lease or exchange of all or any substantial part of the assets of the Trust to any Principal Shareholder (except assets determined by the Trustees to have an aggregate fair market value of less than $1,000,000, aggregating for the purpose of such computation all assets sold, leased or exchanged in any series of similar transactions within a twelve-month period or assets sold in the ordinary course of business); or (iv) the sale, lease or exchange to or with the Trust or any subsidiary thereof, in exchange for securities of the Trust, of any assets of any Principal Shareholder (except assets determined by the Trustees to have an aggregate fair market value of less than $1,000,000 aggregating for the purpose of such computation all assets sold, leased or exchanged in any series of similar transactions within a twelve-month period).

The Board has determined that provisions with respect to the Board and the 75% voting requirements described above, which voting requirements are greater than the minimum requirements under Massachusetts law or the 1940 Act, are in the best interest of Common Shareholders generally. Reference should be made to the Declaration of Trust on file with the SEC for the full text of these provisions.

CONVERSION TO OPEN-END TRUST

The Trust may be converted from a “closed-end company” to an “open-end company,” as those terms are defined in Section 5(a)(2) and 5(a)(1), respectively, of the 1940 Act upon the affirmative vote or consent of the holders of two-thirds of each class of shares outstanding (with each class separately voting thereon or consenting thereto as a separate class). Such affirmative vote or consent shall be in addition to the vote or consent of the holders of the issued and outstanding shares otherwise required by law or by the terms of any Class or Series, whether now or hereafter authorized, or by any agreement between the Trust and any national securities exchange. However, if such conversion is recommended by at least 75% of the Trustees then in office, the vote or written consent of the holders of a majority of the outstanding voting securities of the Trust (which voting securities shall vote separately on the matter by

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class) shall be sufficient to authorize such conversion. The composition of the Trust’s portfolio likely would prohibit the Trust from complying with regulations of the SEC applicable to open-end management investment companies. Accordingly, conversion likely would require significant changes in the Trust’s investment policies and liquidation of a substantial portion of its relatively illiquid portfolio. In the event of conversion, the Common Shares would cease to be listed on the NYSE or other national securities exchange or market system. The Board believes, however, that the closed-end structure is desirable, given the Trust’s investment objectives and policies. Investors should assume, therefore, that it is unlikely that the Board would vote to convert the Trust to an open-end management investment company. Common shareholders of an open-end management 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 such redemption charge, if any, as might be in effect at the time of a redemption. The Trust expects to pay all such redemption requests in cash, but intends to reserve the right to pay redemption requests in a combination of cash or securities. If such partial payment in securities were made, investors may incur brokerage costs in converting such securities to cash. If the Trust were converted to an open-end fund, it is likely that new Common Shares would be sold at net asset value plus a sales load.

Underwriting

The underwriters named below (the “Underwriters”), acting through UBS Securities LLC, 299 Park Avenue, New York, New York, Citigroup Global Markets Inc., 388 Greenwich Street, New York, New York, Merrill Lynch, Pierce, Fenner & Smith Incorporated, 4 World Financial Center, New York, New York, Morgan Stanley & Co. Incorporated, 1585 Broadway, New York, New York, and Wachovia Capital Markets, LLC, 375 Park Avenue, New York, New York, as lead managers, and RBC Capital Markets Corporation, Wells Fargo Securities, LLC, Ameriprise Advisor Services, Inc., Janney Montgomery Scott LLC, Oppenheimer & Co. Inc., Stifel, Nicolaus & Company, Incorporated, Ladenburg Thalmann & Co. Inc., Maxim Group LLC and Southwest Securities, Inc., as their representatives (together with the lead managers, the “Representatives”), have severally agreed, subject to the terms and conditions of an underwriting agreement with the Trust and the Adviser (the “Underwriting Agreement”), to purchase from the Trust the number of Common Shares set forth opposite the their respective names. The Underwriters are committed and purchase and pay for all such Common Shares (other than those covered by the over-allotment option described below) if any are purchased.

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Underwriting

The Trust 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 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 Trust has agreed to pay a commission to the Underwriters in the amount of $0.90 per Common Share (4.50% of the public offering price per Common Share). The Representatives have advised the Trust 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 Common Shares. The Adviser or an affiliate has agreed to pay the amount by which the aggregate of all of the Trust’s offering costs (other than sales loads) exceed $0.04 per Common Share. The Adviser or an affiliate has agreed to reimburse all organizational costs of the Trust. Investors must pay for any Common Shares purchased on or before                     , 2009.

Prior to this offering, there has been no public or private market for the Common Shares or any other securities of the Trust. Consequently, the offering price for the Common Shares was determined by negotiation among the Trust and the Representatives. There can be no assurance, however, that the price at which the 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 Trust has applied for listing of its Common Shares on the NYSE under the trading or “ticker” symbol “EOT.”

In connection with the requirements for listing the Common Shares on the NYSE, the Underwriters have undertaken to sell lots of 100 or more Common Shares to a minimum of 2,000 beneficial owners in the United States. The minimum investment requirement is 100 Common Shares.

The Trust and the Adviser have each 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, except in the cases of willful misfeasance, bad faith, gross negligence or reckless disregard of applicable obligations and duties.

The Trust has agreed not to offer, sell or register with the SEC any additional equity securities of the Trust, other than issuances of Common Shares, including pursuant to the Trust’s Plan, and issuances in connection with any 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 Trust that the Underwriters do not intend to sell to any accounts over which they have been granted and 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 Trust 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

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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 NYSE or otherwise.

The Trust anticipates that the Representatives and certain other Underwriters may from time to time act as brokers or 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.

In connection with the offering, certain of the Underwriters or selected dealers may distribute prospectuses electronically.

Shareholder servicing fee, structuring fees, additional compensation and other relationships

Pursuant to a shareholder servicing agreement (the “Shareholder Servicing Agreement”) between UBS Securities LLC and the Adviser, following the completion of this offering, UBS Securities LLC will at the request of and as specified by the Adviser: (i) undertake to make available public information pertaining to the Trust on an ongoing basis and to communicate to investors and prospective investors the Trust’s features and benefits, (ii) make available to investors and prospective investors market price, net asset value, yield and other information regarding the Trust, if reasonably obtainable, for the purpose of maintaining the visibility of the Trust in the investor community (provided that services described in (i) and (ii) above shall not include customary market research information provided by UBS Securities LLC or its registered broker-dealer affiliates in the ordinary course of their business); (iii) provide certain economic research and statistical information and reports, if reasonably obtainable, on matters including the Trust’s market performance and comparative information regarding the Trust and other investment funds, to the Adviser or the Trust, and consult with representatives of the Adviser and the Board in connection therewith; and (iv) provide information to and consult with the Adviser and/or the Board with respect to applicable strategies designed to address market value discounts, including providing information concerning the use and impact of such strategies by other market participants; provided, however, that under the terms of the Shareholder Servicing Agreement, UBS Securities LLC is not obligated to render any opinions, valuations or recommendations of any kind or to perform any such similar services. For these services, the Adviser (and not the Trust) will pay UBS Securities LLC a fee computed daily and payable quarterly equal, on an annual basis, of 0.10% of the Trust’s average daily gross assets. The total of all of the payments payable to UBS Securities LLC under the Shareholder Servicing Agreement will not exceed         % of the aggregate initial offering price of the Common Shares offered hereby. Under the terms of the Shareholder Servicing Agreement, UBS Securities LLC is relieved from liability to the Adviser for any act or omission to act in the course of its performances under the Shareholder Servicing Agreement in the absence of bad faith, gross negligence or willful misconduct on the part of UBS Securities LLC. The Shareholder Servicing Agreement will continue so long as the investment management agreement remains in effect between the Trust and the Adviser or any successor in interest or affiliate of the Adviser as and to the extent that the investment management agreement is renewed periodically in accordance with the 1940 Act.

The Adviser (and not the Trust) has agreed to pay to Citigroup Global Markets Inc. (“Citi”), from its own assets, a structuring fee for advice relating to the structure, design and organization of the Trust as well as services related to the sale and distribution of the Common Shares in the amount of $            . The structuring fee paid to Citi will not exceed         % of the aggregate initial offering price of the Common Shares offered hereby.

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Shareholder servicing fee, structuring fees, additional compensation and other relationships

The Adviser (and not the Trust) has agreed to pay to Merrill Lynch, Pierce, Fenner & Smith Incorporated (“Merrill Lynch”), from its own assets, additional compensation for advice relating to the structure, design and organization of the Trust as well as services related to the sale and distribution of Common Shares in the amount of $            . The additional compensation paid to Merrill Lynch will not exceed         % of the aggregate initial offering price of the Common Shares offered hereby.

The Adviser (and not the Trust) has agreed to pay to Morgan Stanley & Co. Incorporated (“Morgan Stanley”), from its own assets, a marketing and structuring fee equal to     % of the aggregate price to the public of the Common Shares sold by Morgan Stanley (including shares over-allotted by Morgan Stanley regardless of whether the underwriters’ over-allotment option is exercised), and which will total $            . The marketing and structuring fee paid to Morgan Stanley will not exceed     % of the aggregate initial offering price of the Common Shares offered hereby. In contrast to the underwriting discounts and commissions (earned under the underwriting agreement by the underwriting syndicate as a group), this marketing and structuring fee will be earned by and paid to Morgan Stanley by the Adviser for advice to the Adviser on the design and structuring of, and marketing assistance with respect to, the Trust and the distribution of its Common Shares. These services provided by Morgan Stanley to the Adviser are unrelated to the Adviser’s function of advising the Trust as to its investments in securities.

The Adviser (and not the Trust) has agreed to pay to Wachovia Capital Markets, LLC (“Wachovia”), from its own assets, a structuring fee for advice relating to the structure, design and organization of the Trust as well as services related to the sale and distribution of Common Shares in the amount of $            . The structuring fee paid to Wachovia will not exceed         % of the aggregate initial offering price of the Common Shares offered hereby.

The Adviser (and not the Trust) also may pay from its own assets additional compensation to certain qualified underwriters (the “Qualifying Underwriters”). Qualifying Underwriters receiving additional compensation may be required to meet specified sales targets. Such sales targets, if applicable, may be waived or lowered with respect to any underwriter in the Adviser’s sole discretion. The additional compensation will be payable in arrears at the end of each calendar quarter during the continuance of the Advisory Agreement or other advisory agreement between the Adviser and the Trust.                      will receive additional compensation, which will not exceed     % of the aggregate initial offering price of the Common Shares offered hereby.

The sum of the fees described above to be paid by the Adviser to UBS Securities LLC, and the Qualifying Underwriters, if any, and the sales load to be paid by the Trust will not exceed 9.00% of the aggregate initial offering price of the Common Shares offered hereby. None of the compensation to be received by Underwriters with respect to additional compensation transactions will be subject to any discount methodology.

Custodian and transfer agent

State Street Bank and Trust Company, 200 Clarendon Street, Boston, MA 02116 is the custodian of the Trust and will maintain custody of the securities and cash of the Trust. State Street maintains the Trust’s general ledger and computes net asset value per share at least weekly. State Street also attends to details in connection with the sale, exchange, substitution, transfer and other dealings with the Trust’s investments, and receives and disburses all funds. State Street also assists in preparation of shareholder reports and the electronic filing of such reports with the SEC.

American Stock Transfer & Trust Company is the transfer agent and dividend disbursing agent of the Trust.

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Legal matters

Certain legal matters in connection with the Common Shares will be passed upon for the Trust by K&L Gates LLP, Boston, Massachusetts and for the underwriters by Skadden, Arps, Slate, Meagher & Flom LLP, Chicago, Illinois.

Reports to shareholders

The Trust will send to its shareholders unaudited semi-annual and audited annual reports, including a list of investments held.

Independent registered public accounting firm

Deloitte & Touche LLP, Boston, Massachusetts, is the independent registered public accounting firm for the Trust and will audit the Trust’s financial statements.

Additional information

This prospectus and the Statement of Additional Information do not contain all of the information set forth in the Registration Statement that the Trust has filed with the SEC (file No. 333-156948). The complete Registration Statement may be obtained from the SEC at www.sec.gov. See the cover page of this prospectus for information about how to obtain a paper copy of the Registration Statement or Statement of Additional Information without charge.

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Table of contents of the Statement of Additional Information

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The Trust’s privacy policy

The Eaton Vance organization is committed to ensuring your financial privacy. Each of the financial institutions identified below has in effect the following policy (“Privacy Policy”) with respect to nonpublic personal information about its customers:

Our pledge of privacy applies to the following entities within the Eaton Vance organization: the Eaton Vance Family of Funds, Eaton Vance Management, Eaton Vance Investment Counsel, Boston Management and Research, and Eaton Vance Distributors, Inc.

In addition, our Privacy Policy only applies to those Eaton Vance customers who are individuals and who have a direct relationship with us. If a customer’s account (i.e., fund shares) is held in the name of a third-party financial adviser/broker-dealer, it is likely that only such adviser’s privacy policies apply to the customer. This notice supersedes all previously issued privacy disclosures.

For more information about Eaton Vance’s Privacy Policy, please call 1-800-262-1122.

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SUBJECT TO COMPLETION May 21, 2009

STATEMENT OF ADDITIONAL INFORMATION

                    , 2009

Eaton Vance National Municipal Opportunities Trust

Two International Place

Boston, Massachusetts 02110

(800) 225-6265

THIS STATEMENT OF ADDITIONAL INFORMATION (“SAI”) IS NOT A PROSPECTUS AND IS AUTHORIZED FOR DISTRIBUTION TO PROSPECTIVE INVESTORS ONLY IF PRECEDED OR ACCOMPANIED BY THE PROSPECTUS OF EATON VANCE NATIONAL MUNICIPAL OPPORTUNITIES TRUST (THE “TRUST”) DATED                     , 2009, AS SUPPLEMENTED FROM TIME TO TIME, WHICH IS INCORPORATED HEREIN BY REFERENCE. THIS SAI SHOULD BE READ IN CONJUNCTION WITH SUCH PROSPECTUS, A COPY OF WHICH MAY BE OBTAINED WITHOUT CHARGE BY CONTACTING YOUR FINANCIAL INTERMEDIARY OR CALLING THE TRUST AT 1-800-225-6265.

THE INFORMATION IN THIS SAI IS NOT COMPLETE AND MAY BE CHANGED. THESE SECURITIES MAY NOT BE SOLD UNTIL THE REGISTRATION STATEMENT FILED WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS SAI, WHICH IS NOT A PROSPECTUS, IS NOT AN OFFER TO SELL THESE SECURITIES AND IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

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Capitalized terms used in this SAI and not otherwise defined have the meanings given to them in the Trust’s Prospectus.

Additional investment information and restrictions

ADDITIONAL INVESTMENT INFORMATION

Primary strategies are defined in the prospectus. The following is a description of the various investment practices that may be engaged in, whether as a primary or secondary strategy, and a summary of certain attendant risks. The investment adviser(s) may not buy any of the following instruments or use any of the following techniques unless it believes that doing so will help achieve the investment objective(s).

Municipal Obligations

Municipal obligations are issued to obtain funds for various public and private purposes. Municipal obligations include bonds as well as tax-exempt commercial paper, project notes and municipal notes such as tax, revenue and bond anticipation notes of short maturity, generally less than three years. While most municipal bonds pay a fixed rate of interest semiannually in cash, there are exceptions. Some bonds pay no periodic cash interest, but rather make a single payment at maturity representing both principal and interest. Bonds may be issued or subsequently offered with interest coupons materially greater or less than those then prevailing, with price adjustments reflecting such deviation.

In general, there are three categories of municipal obligations, the interest on which is exempt from federal income tax and is not a tax preference item for purposes of the AMT: (i) certain “public purpose” obligations (whenever issued), which include obligations issued directly by state and local governments or their agencies to fulfill essential governmental functions; (ii) certain obligations issued before August 8, 1986 for the benefit of non-governmental persons or entities; and (iii) certain “private activity bonds” issued after August 7, 1986 which include “qualified Section 501(c)(3) bonds” or refundings of certain obligations included in the second category. In assessing the federal income tax treatment of interest on any municipal obligation, the Trust will rely on an opinion of the issuer’s counsel (when available) and will not undertake any independent verification of the basis for the opinion.

Interest on certain “private activity bonds” issued after August 7, 1986 is exempt from regular federal income tax, but such interest (including a distribution by the Trust derived from such interest) is treated as a tax preference item which could subject the recipient to or increase the recipient’s liability for the Alternative Minimum Tax (“AMT”). For corporate shareholders, the Trust’s distributions derived from interest on all municipal obligations (whenever issued) are included in “adjusted current earnings” for purposes of the AMT as applied to corporations (to the extent not already included in alternative minimum taxable income as income attributable to private activity bonds). For both individual and corporate taxpayers, the American Recovery and Reinvestment Act of 2009 provides an exemption from the federal alternative minimum tax for interest on private activity bonds that are issued after December 31, 2008 and before January 1, 2011, including refunding bonds issued during that period to refund bonds originally issued after December 31, 2003 and before January 1, 2009.

The two principal classifications of municipal bonds are “general obligation” and “revenue” bonds. Issuers of general obligation bonds include states, counties, cities, towns and regional districts. The proceeds of these obligations are used to fund a wide range of public projects, including the construction or improvement of schools, highways and roads, water and sewer systems and a variety of other public purposes. The basic security of general obligation bonds is the issuer’s pledge of its faith, credit, and taxing power for the payment of principal and interest. The taxes that can be levied for the payment of debt service may be limited or unlimited as to rate and amount. Revenue bonds are generally secured by the net revenues derived from a particular facility or group of facilities or, in some cases, from the proceeds of a special excise or other specific revenue source.

Revenue bonds have been issued to fund a wide variety of capital projects including: electric, gas, water, sewer and solid waste disposal systems; highways, bridges and tunnels; port, airport and parking facilities; transportation systems; housing facilities, colleges and universities and hospitals. Although the principal security behind these bonds varies widely, many provide additional security in the form of a debt service reserve fund whose monies may be used to make principal and interest payments on the issuer’s obligations. Housing finance authorities have a wide range of security including partially or fully insured, rent subsidized and/or collateralized mortgages, and/or the net revenues from housing or other public projects. In addition to a debt service reserve fund, some authorities provide further security in the form of a state’s ability (without legal obligation) to make up deficiencies in the debt service reserve fund. Lease rental revenue bonds issued by a state or local authority for capital projects are normally secured by annual lease rental payments from the state or locality to the authority sufficient to cover debt service on the authority’s obligations. Such payments are usually subject to annual appropriations by the state or locality. Industrial development and pollution control bonds, although nominally issued by municipal authorities, are in most cases revenue bonds and are generally not secured by the taxing power of the

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municipality, but are usually secured by the revenues derived by the authority from payments of the industrial user or users. The Trust may on occasion acquire revenue bonds which carry warrants or similar rights covering equity securities. Such warrants or rights may be held indefinitely, but if exercised, the Trust anticipates that it would, under normal circumstances, dispose of any equity securities so acquired within a reasonable period of time.

The obligations of any person or entity to pay the principal of and interest on a municipal obligation are subject to the provisions of bankruptcy, insolvency and other laws affecting the rights and remedies of creditors, such as the Federal Bankruptcy Act, and laws, if any, which may be enacted by Congress or state legislatures extending the time for payment of principal or interest, or both, or imposing other constraints upon enforcement of such obligations. Certain bond structures may be subject to the risk that a taxing authority may issue an adverse ruling regarding tax-exempt status. There is also the possibility that as a result of adverse economic conditions (including unforeseen financial events, natural disasters and other conditions that may affect an issuer’s ability to pay its obligations), litigation or other conditions, the power or ability of any person or entity to pay when due principal of and interest on a municipal obligation may be materially affected or interest and principal previously paid may be required to be refunded. There have been recent instances of defaults and bankruptcies involving municipal obligations which were not foreseen by the financial and investment communities. The Trust will take whatever action it considers appropriate in the event of anticipated financial difficulties, default or bankruptcy of either the issuer of any municipal obligation or of the underlying source of funds for debt service. Such action may include retaining the services of various persons or firms (including affiliates of the investment adviser) to evaluate or protect any real estate, facilities or other assets securing any such obligation or acquired by the Trust as a result of any such event, and the Trust may also manage (or engage other persons to manage) or otherwise deal with any real estate, facilities or other assets so acquired. The Trust anticipates that real estate consulting and management services may be required with respect to properties securing various municipal obligations in its portfolio or subsequently acquired by the Trust. The Trust will incur additional expenditures in taking protective action with respect to portfolio obligations in (or anticipated to be in) default and assets securing such obligations.

The yields on municipal obligations will be dependent on a variety of factors, including purposes of issue and source of funds for repayment, general money market conditions, general conditions of the municipal bond market, size of a particular offering, maturity of the obligation and rating of the issue. The ratings of Moody’s, S&P and Fitch represent their opinions as to the quality of the municipal obligations which they undertake to rate. It should be emphasized, however, that ratings are based on judgment and are not absolute standards of quality. Consequently, municipal obligations with the same maturity, coupon and rating may have different yields while obligations of the same maturity and coupon with different ratings may have the same yield. In addition, the market price of such obligations will normally fluctuate with changes in interest rates, and therefore the net asset value of the Trust will be affected by such changes.

State Specific Investments

The Trust has no current intention to invest 25% or more of its gross assets (but may invest up to such amounts) in municipal obligations of issuers located in the same state (or U.S. territory), but reserves the flexibility to do so in the future. If the Trust invests 25% or more of its gross assets in any one state (or U.S. territory) the Trust may be more susceptible to adverse economic, political or regulatory occurrences affecting a particular state (or U.S. territory). Municipal obligations of issuers located in a single state may be adversely affected by economic developments (including insolvency of an issuer) and by legislation and other governmental activities in that state. There could be economic, business or political developments or court decisions that adversely affect all municipal obligations in the same sector. In particular, investments in revenue bonds might involve (without limitation) the following risks.

Hospital bond ratings are often based on feasibility studies which contain projections of expenses, revenues and occupancy levels. Among the influences affecting a hospital’s gross receipts and net income available to service its debt are demand for hospital services, the ability of the hospital to provide the services required, management capabilities, economic developments in the service area, efforts by insurers and government agencies to limit rates and expenses, confidence in the hospital, service area economic developments, competition, availability and expense of malpractice insurance, Medicaid and Medicare funding and possible federal legislation limiting the rates of increase of hospital charges.

Electric utilities face problems in financing large construction programs in an inflationary period, cost increases and delay occasioned by safety and environmental considerations (particularly with respect to nuclear facilities), difficulty in obtaining fuel at reasonable prices, and in achieving timely and adequate rate relief from regulatory commissions, effects of energy conservation and limitations on the capacity of the capital market to absorb utility debt.

Industrial development bonds (“IDBs”) are normally secured only by the revenues from the project and not by state or local government tax payments, they are subject to a wide variety of risks, many of which relate to the nature of the specific project. Generally, IDBs are sensitive to the risk of a slowdown in the economy.

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Standard tobacco bonds are secured by a single source of revenue, installment payments made by tobacco companies stemming from the settlement of lawsuits brought against them by various states (the “Master Settlement Agreement”). Appropriation backed tobacco bonds are supported by the same Master Settlement Agreement payments as standard tobacco bonds, but are also subject to a state’s pledge that the governor will request an appropriation of funds in its annual budget for debt service if Master Settlement Agreement revenues are insufficient. These payments are not generally fixed but rather are tied to the volume of the company’s U.S. sales of cigarettes. Tobacco bonds are subject to several risks, including the risk that cigarette consumption declines or that a tobacco company defaults on its obligation to make payments to the state. Escrowed tobacco bonds no longer rely on Master Settlement Agreement revenue as security, and are backed by a variety of government securities.

In addition, the airline industry continues to evolve. A number of major carriers have either emerged from bankruptcy or are currently in bankruptcy. Recent problems include, but are not limited to, increased competition, labor and union conflicts, greater security costs and fluctuating jet fuel prices. Court rulings have given some guidance to the viability of collateral structures. However, there is still uncertainty as to the strength of collateral pledged under various security systems.

Certain tax-exempt bonds issued by Native American tribes may be subject to the risk that a taxing authority would determine that the income from such bonds is not eligible for tax-exempt status. In the event of any final adverse ruling to this effect, holders of such bonds may be subject to penalties.

Insured Obligations

The Trust may purchase municipal obligations insured as to their scheduled payment of principal and interest or municipal obligations that are additionally secured by 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 sometimes paid for insured obligations may reduce the Trust’s current yield. See Appendix A for a description of the claims-paying ability ratings of S&P and Moody’s. The insurance does not guarantee the market value of the insured obligation. To the extent that securities held by the Trust are insured as to principal and interest payments by insurers whose claims-paying ability rating is downgraded by Moody’s, S&P or Fitch, the value of such securities may be affected.

Credit Quality

While municipal obligations rated investment grade or below and comparable unrated municipal obligations may have some quality and protective characteristics, these characteristics can be expected to be offset or outweighed by uncertainties or major risk exposures to adverse conditions. Lower rated and comparable unrated municipal obligations are subject to the risk of an issuer’s inability to meet principal and interest payments on the obligations (credit risk) and may also be subject to greater price volatility due to such factors as interest rate sensitivity, market perception of the creditworthiness of the issuer and general market liquidity (market risk). Lower rated or unrated municipal obligations are also more likely to react to real or perceived developments affecting market and credit risk than are more highly rated obligations, which react primarily to movements in the general level of interest rates.

Municipal obligations held by the Trust which are rated below investment grade but which, subsequent to the assignment of such rating, are backed by escrow accounts containing U.S. Government obligations may be determined by the investment adviser to be of investment grade quality for purposes of the Trust’s investment policies. The Trust may retain in its portfolio an obligation whose rating drops after its acquisition, including defaulted obligations, if such retention is considered desirable by the investment adviser; provided, however, that holdings of obligations rated below Baa or BBB will be less than 30% of the Trust’s investments in municipal obligations and holdings rated below B- by Standard & Poors or Fitch or B3 by Moodys will be less than 5% of its municipal obligations investments, each at the time of purchase. In the case of a defaulted obligation, the Trust may incur additional expense seeking recovery of its investment. See “Portfolio of Investments” in the “Financial Statements” incorporated by reference into this SAI with respect to any defaulted obligations held by the Trust.

When the Trust invests in lower rated or unrated municipal obligations, the achievement of the Trust’s goals is more dependent on the investment adviser’s ability than would be the case if the Trust were investing in municipal obligations in the higher rating categories. In evaluating the credit quality of a particular issue, whether rated or unrated, the investment adviser may take into consideration, among other things, the financial resources of the issuer (or, as appropriate, of the underlying source of funds for debt service), its sensitivity to economic conditions and trends, any operating history of and the community support for the facility financed by the issue, the ability of the issuer’s management and regulatory matters. The investment adviser may also purchase structured derivative

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products with greater or lesser credit risk than the underlying bonds. Such bonds may be rated investment grade, as well as below investment grade. For a description of municipal bond ratings, see Appendix A.

Municipal Leases

The Trust may invest in municipal leases and participations therein, which arrangements frequently involve special risks. Municipal leases are obligations in the form of a lease, installment purchase or conditional sales contract (which typically provide for the title to the leased asset to pass to the governmental issuer) which is issued by state or local governments to acquire equipment and facilities. Interest income from such obligations is generally exempt from local and state taxes in the state of issuance. “Participations” in such leases are undivided interests in a portion of the total obligation. Participations entitle their holders to receive a pro rata share of all payments under the lease. The obligation of the issuer to meet its obligations under such leases is often subject to the appropriation by the appropriate legislative body, on an annual or other basis, of funds for the payment of the obligations. Investments in municipal leases are thus subject to the risk that the legislative body will not make the necessary appropriation and the issuer will not otherwise be willing or able to meet its obligation.

Certain municipal lease obligations owned by the Trust may be deemed illiquid, unless determined by the investment adviser, pursuant to guidelines adopted by the Trustees, to be liquid securities. In determining the liquidity of municipal lease obligations, the investment adviser will consider the factors it believes are relevant to the marketability of the obligation, to the extent that information regarding such factor is available to the investment adviser and pertinent to the liquidity determination, which may include: (1) the willingness of dealers to bid for the obligation; (2) the number of dealers willing to purchase or sell the obligation and the number of other potential buyers; (3) the frequency of trades and quotes for the obligation; (4) the nature of the marketplace trades, including the time needed to dispose of the obligation, the method of soliciting offers, and the mechanics of transfer; (5) the willingness of the governmental issuer to continue to appropriate funds for the payment of the obligation; (6) how likely or remote an event of nonappropriation may be, which depends in varying degrees on a variety of factors, including those relating to the general creditworthiness of the governmental issuer, its dependence on its continuing access to the credit markets, and the importance to the issuer of the equipment, property or facility covered by the lease or contract; (7) the rating, if any, assigned to the obligation and/or the governmental issuer by any nationally recognized statistical rating organization; (8) whether the obligation is insured as to the timely payment of principal and interest; and (9) all factors and information unique to the obligation in determining its liquidity. If the municipal lease obligation is insured as to the timely payment of principal and interest, or if the obligation has an investment grade rating (rated BBB or Baa or higher), the investment adviser will consider the obligation to be liquid. In the event the Trust acquires an unrated municipal lease obligation, the investment adviser will be responsible for determining the credit quality of such obligation on an ongoing basis, including an assessment of the likelihood that the lease may or may not be cancelled.

Zero Coupon Bonds

Zero coupon bonds are debt obligations which do not require the periodic payment of interest and are issued at a significant discount from face value. The discount approximates the total amount of interest the bonds will accrue and compound over the period until maturity at a rate of interest reflecting the market rate of the security at the time of issuance. The Trust is required to accrue income from zero coupon bonds on a current basis, even though it does not receive that income currently in cash, and the Trust is required to distribute that income for each taxable year. Thus, the Trust may have to sell other investments to obtain cash needed to make income distributions.

When-Issued Securities

New issues of municipal obligations are sometimes offered on a “when-issued” basis, that is, delivery and payment for the securities normally take place within a specified number of days after the date of the Trust’s commitment and are subject to certain conditions such as the issuance of satisfactory legal opinions. The Trust may also purchase securities on a when-issued basis pursuant to refunding contracts in connection with the refinancing of an issuer’s outstanding indebtedness. Refunding contracts generally require the issuer to sell and the Trust to buy such securities on a settlement date that could be several months or several years in the future. The Trust may also purchase instruments that give the Trust the option to purchase a municipal obligation when and if issued.

The Trust will make commitments to purchase when-issued securities only with the intention of actually acquiring the securities, but may sell such securities before the settlement date if it is deemed advisable as a matter of investment strategy. The payment obligation and the interest rate that will be received on the securities are fixed at the time the Trust enters into the purchase commitment. When the Trust commits to purchase a security on a when-issued basis it records the transaction and reflects the value of the security in determining its net asset value. Securities purchased on a when-issued basis and the securities held by the Trust are subject to changes in value based upon the perception of the creditworthiness of the issuer and changes in the level of interest rates (i.e., appreciation when interest rates decline and depreciation when interest rates rise). Therefore, to the extent that the Trust remains substantially fully

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invested at the same time that it has purchased securities on a when-issued basis, there will be greater fluctuations in the Trust’s net asset value than if it solely set aside cash to pay for when-issued securities.

Credit Derivatives

The Trust may invest in credit default swaps, total return swaps or credit options for hedging and other risk management purposes. In a credit default swap, the buyer of credit protection (or seller of credit risk) agrees to pay the counterparty a fixed, periodic premium for a specified term. In return, the counterparty agrees to pay a contingent payment to the buyer in the event of an agreed upon credit occurrence with respect to a particular reference entity. In a total return swap, the buyer receives a periodic return equal to the total economic return of a specified security, securities or index, for a specified period of time. In return, the buyer pays the counterparty a variable stream of payments, typically based upon short term interest rates, possibly plus or minus an agreed upon spread. Credit options are options whereby the purchaser has the right, but not the obligation, to enter into a transaction involving either an asset with inherent credit risk or a credit derivative, at terms specified at the initiation of the option. Transactions in derivative instruments involve a risk of loss or depreciation due to: unanticipated adverse changes in securities prices, interest rates, indices, the other financial instruments’ prices or currency exchange rates; the inability to close out a position; default by the counterparty; imperfect correlation between a position and the desired hedge; tax constraints on closing out positions; and portfolio management constraints on securities subject to such transactions. Derivative instruments may sometimes increase or leverage exposure to a particular market risk, thereby increasing price volatility.

Redemption, Demand and Put Features and Put Options

Issuers of municipal obligations reserve the right to call (redeem) the bond. If an issuer redeems securities held by the Trust during a time of declining interest rates, the Trust may not be able to reinvest the proceeds in securities providing the same investment return as the securities redeemed. Also, some bonds may have “put” or “demand” features that allow early redemption by the bondholder. Longer term fixed-rate bonds may give the holder a right to request redemption at certain times (often annually after the lapse of an intermediate term). These bonds are more defensive than conventional long term bonds (protecting to some degree against a rise in interest rates) while providing greater opportunity than comparable intermediate term bonds, because the Trust may retain the bond if interest rates decline.

Liquidity and Protective Put Options

The Trust may enter into a separate agreement with the seller of the security or some other person granting the Trust the right to put the security to the seller thereof or the other person at an agreed upon price. The Trust intends to limit this type of transaction to institutions (such as banks or securities dealers) which the investment adviser believes present minimal credit risks and would engage in this type of transaction to facilitate portfolio liquidity or (if the seller so agrees) to hedge against rising interest rates. There is no assurance that this kind of put option will be available to the Trust or that selling institutions will be willing to permit the Trust to exercise a put to hedge against rising interest rates. The Trust does not expect to assign any value to any separate put option which may be acquired to facilitate portfolio liquidity, inasmuch as the value (if any) of the put will be reflected in the value assigned to the associated security; any put acquired for hedging purposes would be valued in good faith under methods or procedures established by the Trustees after consideration of all relevant factors, including its expiration date, the price volatility of the associated security, the difference between the market price of the associated security and the exercise price of the put, the creditworthiness of the issuer of the put and the market prices of comparable put options. Interest income generated by certain bonds having put or demand features may be taxable.

OTC Options

The Trust may enter into an agreement with a potential buyer of a municipal obligation that gives the buyer the right, but not the obligation, to purchase a municipal obligation held by the Trust at a particular price in the future and is commonly referred to as an over-the-counter option or OTC option. Such agreements will be entered solely to help facilitate the selling of municipal obligations, for instance, if the buyer wishes to lock in a price for a particular municipal obligation subject to performing due diligence on the issue or issuer. The buyer may not pay a premium for such option. There is a risk that the value of a municipal obligation underlying an option may appreciate above the value that the buyer has agreed to pay for the municipal obligation and therefore the Trust would not be entitled to the appreciation above such price.

Variable Rate Obligations

The Trust may purchase variable rate obligations. Variable rate instruments provide for adjustments in the interest rate at specified intervals (weekly, monthly, semiannually, etc.). The revised rates are usually set at the issuer’s discretion in which case the investor normally enjoys the right to “put” the security back to the issuer or his agent. Rate revisions may alternatively be determined by formula or in some other contractual fashion. Variable rate obligations normally provide that the holder can demand payment of the obligation on short notice at par with accrued interest and which are frequently secured by letters of credit or other support

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arrangements provided by banks. To the extent that such letters of credit or other arrangements constitute an unconditional guarantee of the issuer’s obligations, a bank may be treated as the issuer of a security for the purposes of complying with the diversification requirements set forth in Section 5(b) of the 1940 Act and Rule 5b-2 thereunder. The Trust would anticipate using these bonds as cash equivalents pending longer term investment of its funds.

Residual Interest Bonds

The Trust may invest in residual interests in a trust that holds municipal securities (“inverse floaters” also known as “residual interest bonds”). The interest rate payable on an inverse floater bears an inverse relationship to the interest rate on another security issued by the trust. Because changes in the interest rate on the other security inversely affect the interest paid on the inverse floater, the value and income of an inverse floater is generally more volatile than that of a fixed rate bond. Inverse floaters have interest rate adjustment formulas which generally reduce or, in the extreme, eliminate the interest paid to the Trust when short-term interest rates rise, and increase the interest paid to the Trust when short-term interest rates fall. Inverse floaters have varying degrees of liquidity, and the market for these securities is relatively volatile. These securities tend to underperform the market for fixed rate bonds in a rising long-term interest rate environment, but tend to outperform the market for fixed rate bonds when long-term interest rates decline. Although volatile, inverse floaters typically offer the potential for yields exceeding the yields available on fixed rate bonds with comparable credit quality and maturity. These securities usually permit the investor to convert the floating rate to a fixed rate (normally adjusted downward), and this optional conversion feature may provide a partial hedge against rising rates if exercised at an opportune time. While inverse floaters expose the Trust to leverage risk because they provide two or more dollars of bond market exposure for every dollar invested, they are not subject to a Trust’s restrictions on borrowings.

A tender option bond trust typically can be collapsed or closed by the holder of the residual interest bonds (such as the Trust) or by the liquidity provider. Generally, because the Trust may act to collapse the tender option bond trust and receive the value of the residual interests bonds held by the Trust within 7-days, such residual interest bonds are considered liquid securities when held by the Trust.

The Trust anticipates using leverage to seek to enhance returns, initially by investing in residual interest bonds. The Trust will not utilize leverage in excess of 15% of its gross assets. The amount of leverage obtained through investments in residual interest bonds is calculated based upon the amount of the corresponding floating-rate notes issued by the tender option bond trust in which the Trust holds a residual interest.

At the discretion of the Adviser, the Trust may enter into a so-called shortfall and forbearance agreement with the sponsor of an inverse floater held by the Trust. The Trust generally may enter into such agreements (i) when the liquidity provider to the tender option bond trust requires such an agreement because the level of leverage in the tender option bond trust exceed the level that the liquidity provider is willing support absent such an agreement; and/or (ii) to seek to prevent the liquidity provider from collapsing the tender option bond trust in the event that the municipal obligation held in the trust has declined in value. Such agreements commit the Trust to reimburse the sponsor of such inverse floater, upon the termination of the trust issuing the inverse floater, the difference between the liquidation value of the underlying security (which is the basis of the inverse floater) and the principal amount due to the holders of the floating rate security issued in conjunction with the inverse floater. Such agreements may expose the Trust’s other assets to losses. Absent a shortfall and forbearance agreement, the Trust would not be required to make such a reimbursement. If the Trust chooses not to enter into such an agreement, the inverse floater could be terminated and the Trust could incur a loss. The Trust will segregate or earmark liquid assets with its custodian in accordance with 1940 Act Release No. 10666 (Apr. 18, 1979) to cover these obligations.

Interest Rate Swaps and Forward Rate Contracts

Interest rate swaps involve the exchange by the Trust with another party of their respective commitments to pay or receive interest, e.g., an exchange of fixed rate payments for floating rate payments. The Trust will only enter into interest rate swaps on a net basis, i.e., the two payment streams are netted out with the Trust receiving or paying, as the case may be, only the net amount of the two payments. The Trust may also enter forward rate contracts. Under these contracts, the buyer locks in an interest rate at a future settlement date. If the interest rate on the settlement date exceeds the lock rate, the buyer pays the seller the difference between the two rates. If the lock rate exceeds the interest rate on the settlement date, the seller pays the buyer the difference between the two rates. Any such gain received by the Trust would be taxable.

If the other party to an interest rate swap or forward rate contract defaults, the Trust’s risk of loss consists of the net amount of payments that the Trust is contractually entitled to receive. The net amount of the excess, if any, of the Trust’s obligations over its entitlements will be maintained in a segregated account by the Trust’s custodian. The Trust will not enter into any interest rate swap or forward rate contract unless the claims-paying ability of the other party thereto is considered to be investment grade by the investment adviser. If there is a default by the other party to such a transaction, the Trust will have contractual remedies pursuant to the agreements related to the transaction. These instruments are traded in the over the counter market.

Illiquid Obligations

At times, a substantial portion of the Trust’s assets may be invested in securities as to which the Trust, by itself or together with other accounts managed by the investment adviser and its affiliates, holds a major portion or all of such securities. Under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Trust could find it more difficult to sell such securities when the investment adviser believes it advisable to do so or may be able to sell such securities only at prices lower than if such securities were more widely held. Under such circumstances, it may also be more difficult to determine the fair value of such securities for purposes of computing the Trust’s net asset value. Illiquid securities may also include those legally restricted as to resale, and securities eligible for resale pursuant to Rule 144A thereunder. Rule 144A securities may be treated as liquid securities if the investment adviser determines that such treatment is warranted. Even if determined to be liquid, holdings of these securities may increase the level of Trust illiquidity if eligible buyers become uninterested in purchasing them.

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The secondary market for some municipal obligations issued within a state (including issues which are privately placed with the Trust) is less liquid than that for taxable debt obligations or other more widely traded municipal obligations. No established resale market exists for certain of the municipal obligations in which the Trust may invest. The market for obligations rated below investment grade is also likely to be less liquid than the market for higher rated obligations. As a result, the Trust may be unable to dispose of these municipal obligations at times when it would otherwise wish to do so at the prices at which they are valued.

Futures Contracts and Options on Futures Contracts

A change in the level of interest rates may affect the value of the securities held by the Trust (or of securities that the Trust expects to purchase). To hedge against changes in rates, the Trust may enter into (i) futures contracts for the purchase or sale of debt securities and (ii) futures contracts on securities indices. All futures contracts entered into by the Trust are traded on exchanges or boards of trade that are licensed and regulated by the CFTC and must be executed through a futures commission merchant or brokerage firm which is a member of the relevant exchange. The Trust may purchase and write call and put options on futures contracts which are traded on a United States exchange or board of trade. The Trust will be required, in connection with transactions in futures contracts and the writing of options on futures, to make margin deposits, which will be held by the futures commission merchant through whom the Trust engages in such futures and options transactions.

Some futures contracts and options thereon may become illiquid under adverse market conditions. In addition, during periods of market volatility, a commodity exchange may suspend or limit transactions in an exchange-traded instrument, which may make the instrument temporarily illiquid and difficult to price. Commodity exchanges may also establish daily limits on the amount that the price of a futures contract or futures option can vary from the previous day’s settlement price. Once the daily limit is reached, no trades may be made that day at a price beyond the limit. This may prevent the Trust from closing out positions and limiting its losses.

The Trust will engage in futures and related options transactions for hedging purposes. The Trust will determine that the price fluctuations in the futures contracts and options on futures used for hedging purposes are substantially related to price fluctuations in securities held by the Trust or which it expects to purchase. The Trust will engage in transactions in futures and related options contracts only to the extent such transactions are consistent with the requirements of the Code, for maintaining qualification of the Trust as a regulated investment company for federal income tax purposes. The Trust has claimed an exclusion from the definition of a Commodity Pool Operator (“CPO”) under the Commodity Exchange Act and therefore is not subject to registration or regulation as a CPO.

Asset Coverage

To the extent required by SEC guidelines, the Trust will only engage in transactions that expose it to an obligation to another party if it owns either (1) an offsetting (“covered”) position for the same type of financial asset, or (2) cash or liquid securities, segregated with its custodian, with a value sufficient at all times to cover its potential obligations not covered as provided in (1). Assets used as cover or segregated with the custodian cannot be sold while the position(s) requiring cover is open unless replaced with other appropriate assets. As a result, if a large portion of assets is segregated or committed as cover, it could impede portfolio management.

Temporary Investments

Cash equivalents are highly liquid, short-term securities such as commercial paper, time deposits, certificates of deposit, short-term notes and short-term U.S. Government obligations. These securities may be subject to federal income, state income and/or other taxes.

Portfolio Turnover

The Trust may sell (and later purchase) securities in anticipation of a market decline (a rise in interest rates) or purchase (and later sell) securities in anticipation of a market rise (a decline in interest rates). Securities may also be purchased and sold based on their relative value in the marketplace. The Trust cannot accurately predict its portfolio turnover rate, but it is anticipated that the annual portfolio turnover rate will generally not exceed 100% (excluding turnover of securities having a maturity of one year or less). A 100% annual turnover rate could occur, for example, if all the securities held by the Trust were replaced once in a period of one year. A high turnover rate (100% or more) necessarily involves greater expenses to the Trust.

Diversified Status

The Trust is a “diversified” investment company under the 1940 Act. This means that with respect to 75% of its total assets (1) it may not invest more than 5% of its total assets in the securities of any one issuer (except U.S. Government obligations) and (2) it may not own more than 10% of the outstanding voting securities of any one issuer. With respect to no more than 25% of its total assets, investments are not subject to the foregoing restrictions.

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INVESTMENT RESTRICTIONS

The following investment restrictions of the Trust are designated as fundamental policies and as such cannot be changed without the approval of the holders of a majority of the Trust’s outstanding voting securities, which as used in this SAI means the lesser of: (a) 67% of the shares of the Trust present or represented by proxy at a meeting if the holders of more than 50% of the outstanding shares are present or represented at the meeting; or (b) more than 50% of the outstanding shares of the Trust. As a matter of fundamental policy, the Trust may not:

For purposes of the Trust’s investment restrictions, the determination of the “issuer” of a municipal obligation which is not a general obligation bond will be made by the Adviser on the basis of the characteristics of the obligation and other relevant factors, the most significant of which is the source of funds committed to meeting interest and principal payments of such obligation.

The Trust may borrow money 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 Trust securities. The 1940 Act currently requires that the Trust have 300% asset coverage with respect to all borrowings other than temporary borrowings.

In regard to restriction (5)(c), the value of the securities loaned by the Trust may not exceed 33 1/3% of its total assets.

For purposes of construing restriction (8), securities of the U.S. Government, its agencies, or instrumentalities are not considered to represent industries. Municipal obligations backed by the credit of a governmental entity are also not considered to represent industries. Furthermore, a large economic or market sector shall not be construed as a group of industries for purposes of this restriction.

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The Trust has adopted the following nonfundamental investment policy which may be changed by the Trustees without approval of the Trust’s shareholders. As a matter of nonfundamental policy, the Trust may not make short sales of securities or maintain a short position, unless at all times when a short position is open it either owns an equal amount of such securities or owns securities convertible into or exchangeable, without payment of any further consideration, for securities of the same issue as, and equal in amount to, the securities sold short.

Upon Board of Trustee approval, the Trust may invest more than 10% of its total assets in one or more other management investment companies (or may invest in affiliated investment companies) to the extent permitted by the 1940 Act and rules thereunder.

Whenever an investment policy or investment restriction set forth in the Prospectus or this SAI states a maximum percentage of assets that may be invested in any security or other asset or describes a policy regarding quality standards, such percentage limitation or standard shall be determined immediately after and as a result of the Trust’s acquisition of such security or asset. Accordingly, any later increase or decrease resulting from a change in values, assets or other circumstances will not compel the Trust to dispose of such security or other asset. Notwithstanding the foregoing, the Trust must always be in compliance with the borrowing policies set forth above.

Trustees and officers

The Trustees of the Trust are responsible for the overall management and supervision of the affairs of the Trust. The Trustees and officers of the Trust are listed below. Except as indicated, each individual has held the office shown or other offices in the same company for the last five years. The “noninterested Trustees” consist of those Trustees who are not “interested persons” of the Trust, as that term is defined under the 1940 Act. The business address of each Trustee and officer is Two International Place, Boston, Massachusetts 02110. As used in this SAI, “EVC” refers to Eaton Vance Corp., “EV” refers to Eaton Vance, Inc., “BMR” refers to Boston Management and Research, and “EVD” refers to Eaton Vance Distributors Inc. EVC and EV are the corporate parent and trustee, respectively, of Eaton Vance and BMR. Each officer affiliated with Eaton Vance may hold a position with other Eaton Vance affiliates that is comparable to his or her position with Eaton Vance listed below.

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The Board of Trustees of the Trust have several standing Committees, including the Governance Committee, the Audit Committee, the Portfolio Management Committee, the Compliance Reports and Regulatory Matters Committee and the Contract Review Committee (formerly, the Special Committee). Each of the Committees is comprised of only noninterested Trustees.

Mmes. Stout (Chair), Peters and Steiger and Messrs Esty, Freedman, Park, Pearlman and Verni are members of the Governance Committee. The purpose of the Governance Committee is to consider, evaluate and make recommendations to the Board of Trustees with respect to the structure, membership and operation of the Board of Trustees and the Committees thereof, including the nomination and selection of noninterested Trustees and a Chairperson of the Board of Trustees and the compensation of such persons. As of the date of this SAI the Governance Committee has not met.

The Governance Committee will, when a vacancy exists or is anticipated, consider any nominee for noninterested Trustee recommended by a shareholder if such recommendation is submitted in writing to the Governance Committee, contains sufficient background information concerning the candidate, including evidence the candidate is willing to serve as a noninterested Trustee if selected for the position, and is received in a sufficiently timely manner.

Messrs. Park (Chair) and Verni and Mmes. Steiger and Stout are members of the Audit Committee. The Board of Trustees has designated Mr. Park, a noninterested Trustee, as audit committee financial expert. The Audit Committee’s purposes are to (i) oversee the Trust’s accounting and financial reporting processes, its internal control over financial reporting, and, as appropriate, the internal control over financial reporting of certain service providers; (ii) oversee or, as appropriate, assist Board oversight of the quality and integrity of the Trust’s financial statements and the independent audit thereof; (iii) oversee, or, as appropriate, assist Board oversight of, the Trust’s compliance with legal and regulatory requirements that relate to the Trust’s accounting and financial reporting, internal control over financial reporting and independent audits; (iv) approve prior to appointment the engagement and, when appropriate,

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replacement of the independent registered public accounting firm, and, if applicable, nominate the independent registered public accounting firm to be proposed for shareholder ratification in any proxy statement of the Trust; (v) evaluate the qualifications, independence and performance of the independent registered public accounting firm and the audit partner in charge of leading the audit; and (vi) prepare, as necessary, audit committee reports consistent with the requirements of applicable SEC and stock exchange rules for inclusion in the proxy statement of a Trust. As of the date of this SAI the Audit Committee has not met.

Messrs. Verni (Chair), Esty, Freedman, Park and Pearlman and Ms. Peters are currently members of the Contract Review Committee. The purposes of the Contract Review Committee are to consider, evaluate and make recommendations to the Board of Trustees concerning the following matters: (i) contractual arrangements with each service provider to the Trust, including advisory and administrative services, transfer agency, custodial services and fund accounting, and distribution services; (ii) any and all other matters in which any service provider (including Eaton Vance or any affiliated entity thereof) has an actual or potential conflict of interest with the interests of the Trust, or investors therein; and (iii) any other matter appropriate for review by the noninterested Trustees, unless the matter is within the responsibilities of the other Committees of the Board of Trustees. As of the date of this SAI the Contract Review Committee has met one time.

Messrs. Esty (Chair) and Freedman and Ms. Peters are currently members of the Portfolio Management Committee. The purposes of the Portfolio Management Committee are to: (i) assist the Board of Trustees in its oversight of the portfolio management process employed by the Trust and its investment adviser relative to the Trust’s stated objective(s), strategies and restrictions; (ii) assist the Board of Trustees in its oversight of the trading policies and procedures and risk management techniques applicable to the Trust; and (iii) assist the Board of Trustees in its monitoring of the performance results of the Trust. As of the date of this SAI the Portfolio Management Committee has met one time.

Mr. Pearlman (Chair) and Mmes. Steiger and Stout are currently members of the Compliance Reports and Regulatory Matters Committee of the Board of Trustees of the Trust. The purposes of the Compliance Reports and Regulatory Matters Committee are to: (i) assist the Board of Trustees in its oversight role with respect to compliance issues and certain other regulatory matters affecting the Trust; (ii) serve as a liaison between the Board of Trustees and the Trust’s Chief Compliance Officer (the “CCO”); and (iii) serve as a “qualified legal compliance committee” within the rules promulgated by the SEC. As of the date of this SAI the Compliance Reports and Regulatory Matters Committee has not met.

SHARE OWNERSHIP

The following table shows the dollar range of equity securities beneficially owned by each Trustee in the Trust and all Eaton Vance funds overseen by the Trustee as of December 31, 2008.

STATEMENT OF OPERATIONS

Period from January 26, 2009 (date of organization) through April 14, 2009

Set forth below is the number of record holders as of May 20, 2009, of each class of securities of the Registrant: