As a % of
Offering Price

As a % of
Your Investment*

Dealer
Compensation
as a % of
Offering Price

$25,000 but less
than $50,000

$50,000 but less
than $100,000

$100,000 but less
than $250,000

$250,000 but less
than $1,000,000

Total investment returns exclude the effects of sales loads.

     Merrill Lynch Arizona Municipal Bond Fund (the "Fund") is a series of Merrill Lynch Multi-State Municipal Series Trust (the "Trust"), an open-end investment company organized as a Massachusetts business trust. The investment objective of the Fund is to provide shareholders with income exempt from Federal and Arizona income taxes. The Fund invests primarily in a portfolio of long-term investment grade obligations issued by or on behalf of the State of Arizona, its political subdivisions, agencies and instrumentalities and obligations of other qualifying issuers, such as issuers located in Puerto Rico, the U.S. Virgin Islands and Guam, which pay interest exempt, in the opinion of bond counsel to the issuer, from Federal and Arizona income taxes. There can be no assurance that the investment objective of the Fund will be realized. For more information on the Fund's investment objective and policies, see "Investment Objective and Policies."

     Pursuant to the Merrill Lynch Select Pricing^SM System, the Fund offers four classes of shares, each with a different combination of sales charges, ongoing fees and other features. The Merrill Lynch Select Pricing^SM System permits an investor to choose the method of purchasing shares that the investor believes is most beneficial given the amount of the purchase, the length of time the investor expects to hold the shares and other relevant circumstances. See "Purchase of Shares."

     This Statement of Additional Information of the Fund is not a prospectus and should be read in conjunction with the Prospectus of the Fund, dated November __, 1999 (the "Prospectus"), which has been filed with the Securities and Exchange Commission (the "Commission") and can be obtained, without charge, by calling (800) MER-FUND or by writing the Fund at the above address. The Prospectus is incorporated by reference into this Statement of Additional Information, and this Statement of Additional Information is incorporated by reference into the Prospectus. The Fund's audited financial statements are incorporated in this Statement of Additional Information by reference to its 1999 annual report to shareholders. You may request a copy of the annual report at no charge by calling (800) 456-4587 ext. 789 between 8:00 a.m. and 8:00 p.m. on any business day.

Fund Asset Management — Manager
Merrill Lynch Funds Distributor — Distributor

The date of this Statement of Additional Information is November __, 1999.

INVESTMENT OBJECTIVE AND POLICIES

     The investment objective of the Fund is to provide shareholders with income exempt from Federal and Arizona income taxes. The Fund seeks to achieve its objective by investing primarily in a portfolio of long-term investment grade obligations issued by or on behalf of the State of Arizona, its political subdivisions, agencies and instrumentalities and obligations of other qualifying issuers, such as issuers located in Puerto Rico, the US Virgin Islands and Guam, which pay interest exempt, in the opinion of bond counsel to the issuer, from Federal and Arizona income taxes. Obligations exempt from Federal income taxes are referred to herein as "Municipal Bonds," and obligations exempt from Federal and Arizona income taxes are referred to as "Arizona Municipal Bonds." Unless otherwise indicated, references to Municipal Bonds shall be deemed to include Arizona Municipal Bonds. The investment objective as set forth in the first sentence of this paragraph is a fundamental policy and may not be changed without a vote of a majority of the outstanding shares of the Fund. See "How the Fund Invests" in the Prospectus for a general discussion of the Fund's goals, main investment strategies and main risks. The Fund is classified as a diversified fund under the Investment Company Act of 1940, as amended (the "Investment Company Act").

     Under normal circumstances, except when acceptable securities are unavailable as determined by Fund Asset Management, L.P. (the "Manager" or "FAM"), the Fund's manager, or for temporary defensive purposes the Fund will invest at least 65% of its total assets in Arizona Municipal Bonds. The value of bonds and other fixed-income obligations may fall when interest rates rise and rise when interest rates fall. In general, bonds and other fixed-income obligations with longer maturities will be subject to greater volatility resulting from interest rate fluctuations than will similar obligations with shorter maturities. Under normal conditions, it is generally anticipated that the Fund's average weighted maturity will be in excess of ten years. For temporary periods or to provide liquidity, the Fund has the authority to invest as much as 35% of its total assets in tax-exempt or taxable money market obligations with a maturity of one year or less (such short-term obligations being referred to herein as "Temporary Investments"), except that taxable Temporary Investments shall not exceed 20% of the Fund's net assets.

     The Fund may also invest in variable rate demand obligations ("VRDOs") and VRDOs in the form of participation interests ("Participating VRDOs") in variable rate tax-exempt obligations held by a financial institution. See "Description of Temporary Investments." The Fund's hedging strategies, which are described in more detail under "Financial Futures Transactions and Options," are not fundamental policies and may be modified by the Trustees of the Trust without the approval of the Fund's shareholders.

     At least 80% of the Fund's total assets will be invested in Municipal Bonds that are commonly referred to as "investment grade" securities, which are obligations rated at the time of purchase within the four highest quality ratings as determined by either Moody's Investors Service, Inc. ("Moody's") (currently Aaa, Aa, A and Baa), Standard & Poor's ("S&P") (currently AAA, AA, A and BBB) or Fitch IBCA, Inc. ("Fitch") (currently AAA, AA, A and BBB). If unrated, such securities will possess creditworthiness comparable, in the opinion of the Manager, to other obligations in which the Fund may invest. Securities rated in the lowest investment grade rating category are considered to have speculative characteristics.

     The Fund may invest up to 20% of its total assets in Municipal Bonds that are rated below Baa by Moody's or below BBB by S&P or Fitch or which, in the Manager's judgment, possess similar credit characteristics. Such securities, sometimes referred to as "high yield" or "junk" bonds, are predominantly speculative with respect to the capacity to pay interest and repay principal in accordance with the terms of the security and generally involve a greater volatility of price than securities in higher rating categories. See "Description of Municipal Bonds — 'High Yield' or 'Junk' Bonds." The Fund does not intend to purchase debt securities that are in default or which the Manager believes will be in default.

     Certain Municipal Bonds may be entitled to the benefits of letters of credit or similar credit enhancements issued by financial institutions. In such instances, the Trustees and the Manager will take into account in assessing the quality of such bonds not only the creditworthiness of the issuer of such bonds but also the creditworthiness of the financial institution that provides the credit enhancement.

2

securities to be exempt from Federal income taxation ("Non-Municipal Tax-Exempt Securities"). Non-Municipal Tax-exempt Securities could include trust certificates or other instruments evidencing interest in one or more long-term municipal securities. Non-Municipal Tax-exempt Securities also may include securities issued by other investment companies that invest in municipal bonds, to the extent such investments are permitted by applicable law. Non-Municipal Tax-exempt securities will be considered "Municipal Bonds" for purposes of the Fund's investment objective and policies. The Fund at all times will have at least 80% of its net assets invested in securities the interest on which is exempt from Federal taxation. However, interest received on certain otherwise tax-exempt securities that are classified as "private activity bonds" (in general, bonds that benefit non-governmental entities) may be subject to a federal alternative minimum tax. The percentage of the Fund's total assets invested in "private activity bonds" will vary during the year. Federal tax legislation has limited the types and volume of bonds the interest on which qualifies for a Federal income tax exemption. As a result, this legislation and legislation that may be enacted in the future may affect the availability of Municipal Bonds for investment by the Fund. See "Distributions and Taxes — Taxes."

Risk Factors and Special Considerations Relating to Municipal Bonds

     The risks and special considerations involved in investment in Municipal Bonds vary with the types of instruments being acquired. Investments in Non-Municipal Tax-exempt Securities may present similar risks, depending on the particular product. Certain instruments in which the Fund may invest may be characterized as derivative instruments. See "Investment Objective and Policies — Description of Municipal Bonds" and " — Financial Futures Transactions and Options."

     The Fund ordinarily will invest at least 65% of its assets in Arizona Municipal Bonds, and therefore it is more susceptible to factors adversely affecting issuers of Arizona Municipal Bonds than is a municipal bond fund that is not concentrated in issuers of Arizona Municipal Bonds to this degree.

3

limitations on the size of such issues. The interest on Municipal Bonds may bear a fixed rate or be payable at a variable or floating rate. The two principal classifications of Municipal Bonds are "general obligation" and "revenue" bonds, which latter category includes industrial development bonds ("IDBs") and, for bonds issued after August 15, 1986, private activity bonds.

     General Obligation Bonds. General obligation bonds are secured by the issuer's pledge of its faith, credit and taxing power for the payment of principal and interest. The taxing power of any governmental entity may be limited, however, by provisions of its state constitution or laws, and an entity's creditworthiness will depend on many factors, including potential erosion of its tax base due to population declines, natural disasters, declines in the state's industrial base or inability to attract new industries, economic limits on the ability to tax without eroding the tax base, state legislative proposals or voter initiatives to limit ad valorem real property taxes and the extent to which the entity relies on Federal or state aid, access to capital markets or other factors beyond the state's or entity's control. Accordingly, the capacity of the issuer of a general obligation bond as to the timely payment of interest and the repayment of principal when due is affected by the issuer's maintenance of its tax base. The State of Arizona does not issue general obligation bonds; it may issue only revenue bonds, described below. General obligation bonds may, however, be issued by counties, municipalities and, under certain limited circumstances, school districts in Arizona.

     Revenue Bonds. Revenue bonds are payable only from the revenues derived from a particular facility or class of facilities or, in some cases, from the proceeds of a special excise tax or other specific revenue source such as payments from the user of the facility being financed; accordingly the timely payment of interest and the repayment of principal in accordance with the terms of the revenue or special obligation bond is a function of the economic viability of such facility or such revenue source.

     IDBs and Private Activity Bonds. The Fund may purchase IDBs and private activity bonds. IDBs and private activity bonds are, in most cases, tax-exempt securities issued by states, municipalities or public authorities to provide funds, usually through a loan or lease arrangement, to a private entity for the purpose of financing construction or improvement of a facility to be used by the entity. Such bonds are secured primarily by revenues derived from loan repayments or lease payments due from the entity which may or may not be guaranteed by a parent company or otherwise secured. IDBs and private activity bonds generally are not secured by a pledge of the taxing power of the issuer of such bonds. Therefore, an investor should be aware that repayment of such bonds generally depends on the revenues of a private entity and be aware of the risks that such an investment may entail. Continued ability of an entity to generate sufficient revenues for the payment of principal and interest on such bonds will be affected by many factors including the size of the entity, capital structure, demand for its products or services, competition, general economic conditions, government regulation and the entity's dependence on revenues for the operation of the particular facility being financed.

     "Moral Obligation" Bonds. The Fund also may invest in "moral obligation" bonds, which are normally issued by special purpose public authorities. If an issuer of moral obligation bonds is unable to meet its obligations, the repayment of such bonds becomes a moral commitment but not a legal obligation of the state or municipality in question.

     Municipal Notes. Municipal notes are shorter term municipal debt obligations. They may provide interim financing in anticipation of tax collection, bond sales or revenue receipts. If there is a shortfall in the anticipated proceeds, the note may not be fully repaid and the Fund may lose money.

4

installment purchase payments in future years unless money is appropriated for such purpose on a yearly basis. Although "non-appropriation" lease obligations are secured by the leased property, disposition of the property in the event of foreclosure might prove difficult. These securities represent a type of financing that has not yet developed the depth of marketability associated with more conventional securities. Certain investments in lease obligations may be illiquid. The Fund may not invest in illiquid lease obligations if such investments, together with all other illiquid investments, would exceed 15% of the Fund's total assets. The Fund may, however, invest without regard to such limitation in lease obligations which the Manager, pursuant to guidelines which have been adopted by the Board of Trustees and subject to the supervision of the Board, determines to be liquid. The Manager will deem lease obligations to be liquid if they are publicly offered and have received an investment grade rating of Baa or better by Moody's, or BBB or better by S&P or Fitch. Unrated lease obligations, or those rated below investment grade, will be considered liquid if the obligations come to the market through an underwritten public offering and at least two dealers are willing to give competitive bids. In reference to the latter, the Manager must, among other things, also review the creditworthiness of the entity obligated to make payment under the lease obligation and make certain specified determinations based on such factors as the existence of a rating or credit enhancement such as insurance, the frequency of trades or quotes for the obligation and the willingness of dealers to make a market in the obligation.

     Indexed and Inverse Floating Obligations. The Fund may invest in Arizona Municipal Bonds and Municipal Bonds (and Non-Municipal Tax-exempt Securities) yielding a return which is based on a particular index of value or interest rates. For example, the Fund may invest in Arizona Municipal Bonds and Municipal Bonds that pay interest based on an index of Municipal Bond interest rates. The principal amount payable upon maturity of certain Arizona Municipal Bonds and Municipal Bonds also may be based on the value of the index. To the extent the Fund invests in these types of Municipal Bonds, the Fund's return on such Arizona Municipal Bonds and Municipal Bonds will be subject to risk with respect to the value of the particular index. Interest and principal payable on the Municipal Bonds may also be based on relative changes among particular indices. Also, the Fund may invest in so-called "inverse floating obligations" or "residual interest bonds" on which the interest rates typically vary inversely with a short-term floating rate (which may be reset periodically by a dutch auction, a remarketing agent, or by reference to a short-term tax-exempt interest rate index). The Fund may purchase synthetically-created inverse floating rate bonds evidenced by custodial or trust receipts. Generally, income on inverse floating rate bonds will decrease when short-term interest rates increase, and will increase when short-term interest rates decrease. Such securities have the effect of providing a degree of investment leverage, since they may increase or decrease in value in response to changes, as an illustration, in market interest rates at a rate which is a multiple (typically two) of the rate at which fixed-rate long-term tax-exempt securities increase or decrease in response to such changes. As a result, the market values of such securities will generally be more volatile than the market values of fixed-rate tax-exempt securities. To seek to limit the volatility of these securities, the Fund may purchase inverse floating obligations with shorter-term maturities or which contain limitations on the extent to which the interest rate may vary. Certain investments in such obligations may be illiquid. The Fund may not invest in such illiquid obligations if such investments, together with other illiquid investments, would exceed 15% of the Fund's total assets. The Manager, however, believes that indexed and inverse floating obligations represent flexible portfolio management instruments for the Fund which allow the Fund to seek potential investment rewards, hedge other portfolio positions or vary the degree of investment leverage relatively efficiently under different market conditions.

5

     Call and Redemption Risk. The Fund may purchase a Municipal Bond issuer's right to call all or a portion of such Municipal Bond for mandatory tender for purchase (a "Call Right"). A holder of a Call Right may exercise such right to require a mandatory tender for the purchase of related Municipal Bonds, subject to certain conditions. A Call Right that is not exercised prior to maturity of the related Municipal Bond will expire without value. The economic effect of holding both the Call Right and the related Municipal Bond is identical to holding a Municipal Bond as a non-callable security. Certain investments in such obligations may be illiquid. The Fund may not invest in such illiquid obligations if such investments, together with other illiquid investments, would exceed 15% of the Fund's total assets.

     "High Yield" or "Junk" Bonds. The Fund may invest up to 20% of its total assets in Municipal Bonds that are rated below Baa by Moody's or below BBB by S&P or Fitch or which, in the Manager's judgment, possess similar credit characteristics. See Appendix II — "Ratings of Municipal Bonds" for additional information regarding ratings of debt securities. Junk bonds are debt securities that are rated below investment grade by the major rating agencies or are unrated securities that Fund management believes are of comparable quality. Although junk bonds generally pay higher rates of interest than investment grade bonds, they are high risk investments that may cause income and principal losses for the Fund. The major risks in junk bond investments include the following:

     Junk bonds may be issued by less creditworthy companies. These securities are vulnerable to adverse changes in the issuer's industry and to general economic conditions. Issuers of junk bonds may be unable to meet their interest or principal payment obligations because of an economic downturn, specific issuer developments or the unavailability of additional financing.

     The issuers of junk bonds may have a larger amount of outstanding debt relative to their assets than issuers of investment grade bonds. If the issuer experiences financial stress, it may be unable to meet its debt obligations. The issuer's ability to pay its debt obligations also may be lessened by specific issuer developments, or the unavailability of additional financing.

     Junk bonds are frequently ranked junior to claims by other creditors. If the issuer cannot meet its obligations, the senior obligations are generally paid off before the junior obligations.

     Junk bonds frequently have redemption features that permit an issuer to repurchase the security from the Fund before it matures. If an issuer redeems the junk bonds, the Fund may have to invest the proceeds in bonds with lower yields and may lose income.

     Prices of junk bonds are subject to extreme price fluctuations. Negative economic developments may have a greater impact on the prices of junk bonds than on other higher rated fixed income securities.

     Junk bonds may be less liquid than higher rated fixed income securities even under normal economic conditions. There are fewer dealers in the junk bond market, and there may be significant differences in the prices quoted for junk bonds by the dealers. Because they are less liquid, judgment may play a greater role in valuing certain of the Fund's portfolio securities than in the case of securities trading in a more liquid market.

6

Financial Futures Transactions and Options

    The Fund may hedge all or a portion of its portfolio investments against fluctuations in interest rates through the use of options and certain financial futures contracts and options thereon. While the Fund's use of hedging strategies is intended to reduce the volatility of the net asset value of the Fund's shares, the net asset value of the Fund's shares will fluctuate. There can be no assurance the the Fund's hedging transactions will be effective. Furthermore, the Fund may only engage in hedging activities from time to time and may not necessarily be engaging in hedging activities when movements in interest rates occur. The Fund has no obligation to enter into hedging transactions and may choose not to do so.

     The Fund is authorized to purchase and sell certain exchange traded financial futures contracts ("financial futures contracts") solely for the purpose of hedging its investments in Municipal Bonds against declines in value and to hedge against increases in the cost of securities it intends to purchase. However, any transactions involving financial futures or options (including puts and calls associated therewith) will be in accordance with the Fund's investment policies and limitations. A financial futures contract obligates the seller of a contract to deliver and the purchaser of a contract to take delivery of the type of financial instrument covered by the contract, or in the case of index-based futures contracts to make and accept a cash settlement, at a specific future time for a specified price. To hedge its portfolio, the Fund may take an investment position in a futures contract which will move in the opposite direction from the portfolio position being hedged. A sale of financial futures contracts may provide a hedge against a decline in the value of portfolio securities because such depreciation may be offset, in whole or in part, by an increase in the value of the position in the financial futures contracts. A purchase of financial futures contracts may provide a hedge against an increase in the cost of securities intended to be purchased because such appreciation may be offset, in whole or in part, by an increase in the value of the position in the futures contracts.

     Futures Contracts. A futures contract is an agreement between two parties to buy and sell a security or, in the case of an index-based futures contract, to make and accept a cash settlement for a set price on a future date. A majority of transactions in futures contracts, however, do not result in the actual delivery of the underlying instrument or cash settlement, but are settled through liquidation, (i.e., by entering into an offsetting transaction. Futures contracts have been designed by boards of trade which have been designated "contracts markets" by the Commodity Futures Trading Commission ("CFTC")).

     The purchase or sale of a futures contract differs from the purchase or sale of a security in that no price or premium is paid or received. Instead, an amount of cash or securities acceptable to the broker and the relevant contract market, which varies, but is generally about 5% of the contract amount, must be deposited with the broker. This amount is known as "initial margin" and represents a "good faith" deposit assuring the performance of both the purchaser and seller under the futures contract. Subsequent payments to and from the broker, called "variation margin," are required to be made on a daily basis as the price of the futures contract fluctuates making the long and short positions in the futures contract more or less valuable, a process known as "marking to the market." At any time prior to the settlement date of the futures contract, the position may be closed out by taking an opposite position that will operate to terminate the position in the futures contract. A final determination of variation margin is then made, additional cash is required to be paid to or released by the broker and the purchaser realizes a loss or gain. In addition, a nominal commission is paid on each completed sale transaction.

7

     The Municipal Bond Index futures contract is traded only on the CBT. Like other contract markets, the CBT assures performance under futures contracts through a clearing corporation, a nonprofit organization managed by the exchange membership which is also responsible for handling daily accounting of deposits or withdrawals of margin.

     The Fund may purchase and sell financial futures contracts on US Government securities as a hedge against adverse changes in interest rates as described below. With respect to US Government securities, currently there are financial futures contracts based on long-term US Treasury bonds, Treasury notes, Government National Mortgage Association ("GNMA") Certificates and three-month US Treasury bills. The Fund may purchase and write call and put options on futures contracts on US Government securities and purchase and sell Municipal Bond index futures contracts in connection with its hedging strategies.

     Subject to policies adopted by the Trustees, the Fund also may engage in other futures contracts transactions such as futures contracts on other municipal bond indices that may become available if the Manager and the Trustees of the Trust should determine that there is normally a sufficient correlation between the prices of such futures contracts and the Municipal Bonds in which the Fund invests to make such hedging appropriate.

     Futures Strategies. The Fund may sell a financial futures contract (i.e., assume a short position) in anticipation of a decline in the value of its investments in Municipal Bonds resulting from an increase in interest rates or otherwise. The risk of decline could be reduced without employing futures as a hedge by selling such Municipal Bonds and either reinvesting the proceeds in securities with shorter maturities or by holding assets in cash. This strategy, however, entails increased transaction costs in the form of dealer spreads and typically would reduce the average yield of the Fund's portfolio securities as a result of the shortening of maturities. The sale of futures contracts provides an alternative means of hedging against declines in the value of its investments in Municipal Bonds. As such values decline, the value of the Fund's positions in the futures contracts will tend to increase, thus offsetting all or a portion of the depreciation in the market value of the Fund's Municipal Bond investments that are being hedged. While the Fund will incur commission expenses in selling and closing out futures positions, commissions on futures transactions are lower than transaction costs incurred in the purchase and sale of Municipal Bonds. In addition, the ability of the Fund to trade in the standardized contracts available in the futures markets may offer a more effective defensive position than a program to reduce the average maturity of the portfolio securities due to the unique and varied credit and technical characteristics of the municipal debt instruments available to the Fund. Employing futures as a hedge also may permit the Fund to assume a defensive posture without reducing the yield on its investments beyond any amounts required to engage in futures trading.

     When the Fund intends to purchase Municipal Bonds, the Fund may purchase futures contracts as a hedge against any increase in the cost of such Municipal Bonds resulting from a decrease in interest rates or otherwise, that may occur before such purchases can be effected. Subject to the degree correlation between the Municipal Bonds and the futures contracts, subsequent increases in the cost of Municipal Bonds should be reflected in the value of the futures held by the Fund. As such purchases are made, an equivalent amount of futures contracts will be closed out. Due to changing market conditions and interest rate forecasts, however, a futures position may be terminated without a corresponding purchase of portfolio securities.

     Call Options on Futures Contracts. The Fund may also purchase and sell exchange traded call and put options on financial futures contracts on US Government securities. The purchase of a call option on a futures contract is analogous to the purchase of a call option on an individual security. Depending on the pricing of the option compared to either the futures contract upon which it is based or the price of the underlying debt securities, it may or may not be less risky than ownership of the futures contract or underlying debt securities. Like the purchase of a futures contract, the Fund will purchase a call option on a futures contract to hedge against a market advance when the Fund is not fully invested.

8

     The writing of a put option on a futures contract constitutes a partial hedge against increasing prices of the securities which are deliverable upon exercise of the futures contract. If the futures price at expiration is higher than the exercise price, the Fund will retain the full amount of the option premium which provides a partial hedge against any increase in the price of Municipal Bonds which the Fund intends to purchase.

     The writer of an option on a futures contract is required to deposit initial and variation margin pursuant to requirements similar to those applicable to futures contracts. Premiums received from the writing of an option will be included in initial margin. The writing of an option on a futures contract involves risks similar to those relating to futures contracts

     The Trust has received an order from the Commission exempting it from the provisions of Section 17(f) and Section 18(f) of the Investment Company Act, in connection with its strategy of investing in futures contracts. Section 17(f) relates to the custody of securities and other assets of an investment company and may be deemed to prohibit certain arrangements between the Fund and commodities brokers with respect to initial and variation margin. Section 18(f) of the Investment Company Act prohibits an open-end investment company such as the Trust from issuing a "senior security" other than a borrowing from a bank. The staff of the Commission has in the past indicated that a futures contract may be a "senior security" under the Investment Company Act.

     Restrictions on Use of Futures Transactions. Regulations of the CFTC applicable to the Fund require that all of the Fund's futures transactions constitute bona fide hedging transactions and that the Fund purchase and sell futures contracts and options thereon (i) for bona fide hedging purposes, and (ii) for non-hedging purposes, if the aggregate initial margin and premiums required to establish positions in such contracts and options does not exceed 5% of the liquidation value of the Fund's portfolio assets after taking into account unrealized profits and unrealized losses on any such contracts and options. (However, the Fund intends to engage in options and futures transactions only for hedging purposes.) Margin deposits may consist of cash or securities acceptable to the broker and the relevant contract market.

     When the Fund purchases a futures contract, or writes a put option or purchases a call option thereon, it will maintain an amount of cash, cash equivalents (e.g., high grade commercial paper and daily tender adjustable notes) or liquid securities in a segregated account with the Fund's custodian, so that the amount so segregated plus the amount of initial and variation margin held in the account of its broker equals the market value of the futures contracts, thereby ensuring that the use of such futures contract is unleveraged. It is not anticipated that transactions in futures contracts will have the effect of increasing portfolio turnover.

     Risk Factors in Futures Transactions and Options. Investment in futures contracts involves the risk of imperfect correlation between movements in the price of the futures contract and the price of the security being hedged. The hedge will not be fully effective when there is imperfect correlation between the movements in the prices of two financial instruments. For example, if the price of the futures contract moves more than the price of the hedged security, the Fund will experience either a loss or gain on the futures contract which is not completely offset by movements in the price of the hedged securities. To compensate for imperfect correlations, the Fund may purchase or sell futures contracts in a greater dollar amount than the hedged securities if the volatility of the hedged securities is historically greater than the volatility of the futures contracts. Conversely, the Fund may purchase or sell fewer futures contracts if the volatility of the price of the hedged securities is historically less than that of the futures contracts.

9

prices of Municipal Bonds held by the Fund may be greater. Municipal Bond Index futures contracts were approved for trading in 1986. Trading in such futures contracts may tend to be less liquid than trading in other futures contracts. The trading of futures contracts also is subject to certain market risks, such as inadequate trading activity, which could at times make it difficult or impossible to liquidate existing positions.

     The Fund expects to liquidate a majority of the futures contracts it enters into through offsetting transactions on the applicable contract market. There can be no assurance, however, that a liquid secondary market will exist for any particular futures contract at any specific time. Thus, it may not be possible to close out a futures position. In the event of adverse price movements, the Fund would continue to be required to make daily cash payments of variation margin. In such situations, if the Fund has insufficient cash, it may be required to sell portfolio securities to meet daily variation margin requirements at a time when it may be disadvantageous to do so. The inability to close out futures positions also could have an adverse impact on the Fund's ability to hedge effectively its investments in Municipal Bonds. The liquidity of a secondary market in a futures contract may be adversely affected by "daily price fluctuation limits" established by commodity exchanges which limit the amount of fluctuation in a futures contract price during a single trading day. Once the daily limit has been reached in the contract, no trades may be entered into at a price beyond the limit, thus preventing the liquidation of open futures positions. Prices have in the past moved beyond the daily limit on a number of consecutive trading days. The Fund will enter into a futures position only if, in the judgment of the Manager, there appears to be an actively traded secondary market for such futures contracts.

     The successful use of transactions in futures and related options also depends on the ability of the Manager to forecast correctly the direction and extent of interest rate movements within a given time frame. To the extent interest rates remain stable during the period in which a futures contract or option is held by the Fund or such rates move in a direction opposite to that anticipated, the Fund may realize a loss on the hedging transaction which is not fully or partially offset by an increase in the value of portfolio securities. As a result, the Fund's total return for such period may be less than if it had not engaged in the hedging transaction.

     Because of low initial margin deposits made upon the opening of a futures position, futures transactions involve substantial leverage. As a result, relatively small movements in the price of the futures contracts can result in substantial unrealized gains or losses. There is also the risk of loss by the Fund of margin deposits in the event of bankruptcy of a broker with whom the Fund has an open position in a financial futures contract. Because the Fund will engage in the purchase and sale of futures contracts solely for hedging purposes, however, any losses incurred in connection therewith should, if the hedging strategy is successful, be offset in whole or in part by increases in the value of securities held by the Fund or decreases in the price of securities the Fund intends to acquire.

     The amount of risk the Fund assumes when it purchases an option on a futures contract is the premium paid for the option plus related transaction costs. In addition to the correlation risks discussed above, the purchase of an option on a futures contract also entails the risk that changes in the value of the underlying futures contract will not be fully reflected in the value of the option purchased.

Description of Temporary Investments

10

     VRDOs and Participating VRDOs. VRDOs are tax-exempt obligations which contain a floating or variable interest rate adjustment formula and a right of demand on the part of the holder thereof to receive payment of the unpaid principal balance plus accrued interest upon a short notice period not to exceed seven days. There is, however, the possibility that because of default or insolvency the demand feature of VRDOs and Participating VRDOs may not be honored. The interest rates are adjustable at intervals (ranging from daily to up to one year) to some prevailing market rate for similar investments, such adjustment formula being calculated to maintain the market value of the VRDOs, at approximately the par value of the VRDOs on the adjustment date. The adjustments typically are based upon the Public Securities Association Index or some other appropriate interest rate adjustment index. The Fund may invest in all types of tax-exempt instruments currently outstanding or to be issued in the future which satisfy the short-term maturity and quality standards of the Fund.

     Participating VRDOs provide the Fund with a specified undivided interest (up to 100%) of the underlying obligation and the right to demand payment of the unpaid principal balance plus accrued interest on the Participating VRDOs from the financial institution upon a specified number of days notice, not to exceed seven days. In addition, the Participating VRDO is backed by an irrevocable letter of credit or guaranty of the financial institution. The Fund would have an undivided interest in the underlying obligation and thus participate on the same basis as the financial institution in such obligation except that the financial institution typically retains fees out of the interest paid on the obligation for servicing the obligation, providing the letter of credit and issuing the repurchase commitment. The Fund has been advised by its counsel that the Fund should be entitled to treat the income received on Participating VRDOs as interest from tax-exempt obligations.

     VRDOs that contain a right of demand to receive payment of the unpaid principal balance plus accrued interest on a notice period exceeding seven days may be deemed to be illiquid securities. A VRDO with a demand notice period exceeding seven days will therefore be subject to the Fund's restriction on illiquid investments unless, in the judgment of the Trustees, such VRDO is liquid. The Trustees may adopt guidelines and delegate to the Manager the daily function of determining and monitoring liquidity of such VRDOs. The Trustees, however, will retain sufficient oversight and will be ultimately responsible for such determinations.

     The Temporary Investments, VRDOs and Participating VRDOs in which the Fund may invest will be in the following rating categories at the time of purchase: MIG-1/VMIG-1 through MIG-3/VMIG-3 for notes and VRDOs and Prime-1 through Prime-3 for commercial paper (as determined by Moody's), SP-1 through SP-2 for notes and A-1 through A-3 for VRDOs and commercial paper (as determined by S&P), or F-1 through F-3 for notes, VRDOs and commercial paper (as determined by Fitch). Temporary Investments, if not rated, must be of comparable quality in the opinion of the Manager. In addition, the Fund reserves the right to invest temporarily a greater portion of its assets in Temporary Investments for defensive purposes, when, in the judgment of the Manager, market conditions warrant.

     Repurchase Agreements. The Fund may invest in securities pursuant to repurchase agreements. Repurchase agreements may be entered into only with a member bank of the Federal Reserve System or primary dealer or an affiliate thereof, in US Government securities. Under such agreements, the bank or primary dealer or an affiliate thereof agrees, upon entering into the contract, to repurchase the security at a mutually agreed upon time and price, thereby determining the yield during the term of the agreement. This results in a fixed rate of return insulated from market fluctuations during such period. In repurchase agreements, the prices at which the trades are conducted do not reflect accrued interest on the underlying obligations. Such agreements usually cover short periods, such as under one week. Repurchase agreements may be construed to be collateralized loans by the purchaser to the seller secured by the securities transferred to the purchaser. In a repurchase agreement, the Fund will require the seller to provide additional collateral if the market value of the securities falls below the repurchase price at any time during the term of the repurchase agreement. In the event of default by the seller under a repurchase agreement construed to be a collateralized loan, the underlying securities are not owned by the Fund but only constitute collateral for the seller's obligation to pay the repurchase price. Therefore, the Fund may suffer time delays and incur costs or possible losses in connection with the disposition of the collateral. In the event of a default under such a repurchase agreement, instead of the contractual fixed rate of return, the rate

11

of return to the Fund shall be dependent upon intervening fluctuations of the market value of such security and the accrued interest on the security. In such event, the Fund would have rights against the seller for breach of contract with respect to any losses arising from market fluctuations following the failure of the seller to perform. The Fund may not invest in repurchase agreements maturing in more than seven days if such investments, together with all other illiquid investments, would exceed 15% of the Fund's net assets.

     In general, for Federal income tax purposes, repurchase agreements are treated as collateralized loans secured by the securities "sold." Therefore, amounts earned under such agreements will not be considered tax-exempt interest. The treatment of purchase and sales contracts is less certain.

     Suitability. The economic benefit of an investment in the Fund depends upon many factors beyond the control of the Fund, the Manager and its affiliates. Because of its emphasis on Arizona Municipal Bonds, the Fund should be considered a vehicle for diversification and not as a balanced investment program. The suitability for any particular investor of a purchase of shares in the Fund will depend upon, among other things, such investor's tax status, investment objectives and such investor's ability to accept the risks associated with investing in Arizona Municipal Bonds, including the risk of loss of principal and the risk of receiving income that is not exempt from Federal and Arizona income taxes.

Investment Restrictions

     The Fund has adopted a number of fundamental and non-fundamental restrictions and policies relating to the investment of its assets and its activities. The fundamental policies set forth below may not be changed without the approval of the holders of a majority of the Fund's outstanding voting securities (which for this purpose and under the Investment Company Act means the lesser of (i) 67% of the Fund's shares present at a meeting at which more than 50% of the outstanding shares of the Fund are represented or (ii) more than 50% of the Fund's outstanding shares). The Fund may not:

     Under the non-fundamental investment restrictions, which may be changed by the Board of Trustees without shareholder approval, the Fund may not:

     The Fund's investments will be limited so as to qualify as a "regulated investment company" for purposes of the Code. See "Dividends and Taxes — Taxes." To qualify, among other requirements, the Trust will limit the Fund's investments so that, at the close of each quarter of the taxable year, (i) not more than 25% of the market value of the Fund's total assets will be invested in the securities of a single issuer, and (ii) with respect to 50% of the market value of its total assets, not more than 5% of the market value of its total assets will be invested in the securities of a single issuer and the Fund will not own more than 10% of the outstanding voting securities of a single issuer. For purposes of this restriction, the Fund will regard each state and each political subdivision, agency or instrumentality of such state and each multi-state agency of which such state is a member and each public authority which issues securities on behalf of a private entity as a separate issuer, except that if the security is backed only by the assets and revenues of a non-government entity then the entity with the ultimate responsibility for the payment of interest and principal may be regarded as the sole issuer. These tax-related limitations may be changed by the Trustees of the Trust to the extent necessary to comply with changes to the Federal tax requirements. The Fund is "diversified" under the Investment Company Act and must satisfy the foregoing 5% and 10% requirements with respect to 75% of its total assets.

13

Portfolio Turnover

     The Manager will effect portfolio transactions without regard to the time the securities have been held, if, in its judgment, such transactions are advisable in light of a change in circumstances of a particular issuer or in general market, financial or economic conditions. As a result of its investment policies, the Fund may engage in a substantial number of portfolio transactions and the Fund's portfolio turnover rate may vary greatly from year to year or during periods within a year. The portfolio turnover rate is calculated by dividing the lesser of the Fund's annual sales or purchases of portfolio securities (exclusive of purchases or sales of securities whose maturities at the time of acquisition were one year or less) by the monthly average value of the securities in the portfolio during the year. A high portfolio turnover may result in negative tax consequences, such as an increase in capital gain dividends or in ordinary income dividends of accrued market discount. See "Dividends and Taxes — Taxes." High portfolio turnover may also involve correspondingly greater transaction costs in the form of dealer spreads and brokerage commissions, which are borne directly by the Fund.

MANAGEMENT OF THE TRUST

Trustees and Officers

     The Trustees of the Trust consist of seven individuals, five of whom are not "interested persons" of the Trust as defined in the Investment Company Act (the "non-interested Trustees"). The Trustees are responsible for the overall supervision of the operations of the Trust and perform the various duties imposed on the directors or Trustees of investment companies by the Investment Company Act. Information about the Trustees, executive officers of the Trust and the portfolio manager of the Fund, including their ages and their principal occupations for at least the last five years, is set forth below. Unless otherwise noted, the address of each Trustee, executive officer and the portfolio manager is PO Box 9011, Princeton, New Jersey 08543-9011.

     TERRY K. GLENN (58) — President and Trustee (1)(2) — Executive Vice President of the Manager and Merrill Lynch Asset Management, LP ("MLAM") (which terms as used herein include their corporate predecessors) since 1983; Executive Vice President and Director of Princeton Services, Inc. ("Princeton Services") since 1993; President of Princeton Funds Distributor, Inc. ("PFD") since 1986 and Director thereof since 1991; President of Princeton Administrators, LP since 1988.

     JAMES H. BODURTHA (55) — Trustee (2)(3) — 36 Popponesset Road, Cotuit, Massachusetts 02635. Director and Executive Vice President, The China Business Group, Inc. since 1996; Chairman and Chief Executive Officer, China Enterprise Management Corporation from 1993 to 1996; Chairman, Berkshire Corporation since 1980; Partner, Squire, Sanders & Dempsey from 1980 to 1993.

     HERBERT I. LONDON (60) — Trustee (2)(3) — 2 Washington Square Village, New York, New York 10012. John M. Olin Professor of Humanities, New York University since 1993 and Professor thereof since 1980; President, Hudson Institute since 1997 and Trustee thereof since 1980; Dean, Gallatin Division of New York University from 1976 to 1993; Distinguished Fellow, Herman Kahn Chair, Hudson Institute from 1984 to 1985; Director, Damon Corporation from 1991 to 1995; Overseer, Center for Naval Analyses from 1983 to 1993; Limited Partner, Hypertech LP since 1996.

     ROBERT R. MARTIN (72) — Trustee (2)(3) — 513 Grand Hill, St. Paul, Minnesota 55102. Chairman and Chief Executive Officer, Kinnard Investments, Inc. from 1990 to 1993; Executive Vice President, Dain Bosworth from 1974 to 1989; Director, Carnegie Capital Management from 1977 to 1985 and Chairman thereof in 1979; Director, Securities Industry Association from 1981 to 1982 and Public Securities Association from 1979 to 1980; Chairman of the Board, WTC Industries Inc. in 1994; Trustee, Northland College since 1992.

14

     ARTHUR ZEIKEL (67) — Trustee (1)(2) — 300 Woodland Avenue, Westfield, New Jersey 07090. Chairman of the Manager and MLAM from 1997 to 1999 and President thereof from 1977 to 1997; Chairman of Princeton Services from 1997 to 1999, Director thereof from 1993 to 1999 and President thereof from 1993 to 1997; Executive Vice President of Merrill Lynch & Co., Inc. ("ML & Co.") from 1990 to 1999.

     VINCENT R. GIORDANO (55) — Senior Vice President (1)(2) — Senior Vice President of the Manager and MLAM since 1984; Senior Vice President of Princeton Services since 1993.

     KENNETH A. JACOB (48) — Vice President (1)(2) — First Vice President of MLAM since 1997; Vice President of MLAM from 1984 to 1997; Vice President of the Manager since 1984.

     WALTER O'CONNOR (37) — Portfolio Manager and Vice President (1)(2) — Director (Municipal Tax Exempt) of MLAM since 1997; Vice President of MLAM from 1993 to 1997; Assistant Vice President of MLAM from 1991 to 1993.

     DONALD C. BURKE (39) — Vice President and Treasurer (1)(2) — Senior Vice President and Treasurer of the Manager and MLAM since 1999; Senior Vice President and Treasurer of Princeton Services since 1999; Vice President of PFD since 1999; First Vice President of MLAM from 1997 to 1999; Vice President of MLAM from 1990 to 1997; Director of Taxation of MLAM since 1990.

     As of August 31, 1999, the Trustees, officers of the Trust and officers of the Fund as a group (12 persons) owned an aggregate of less than 1% of the outstanding shares of the Fund. At such date, Mr. Zeikel, a Trustee of the Trust, Mr. Glenn, a Trustee and officer of the Trust and the other officers of the Trust and the Fund owned an aggregate of less than 1% of the outstanding shares of common stock of ML & Co.

Compensation of Trustees

     The Trust pays each non-interested Trustee a fee of $10,000 per year plus $1,000 per Board meeting attended. The Trust also compensates members of its Audit and Nominating Committee (the "Committee"), which consists of all the non-interested Trustees, a fee of $2,000 per year plus $500 per Committee meeting attended. The Trust reimburses each non-interested Trustee for his out-of-pocket expenses relating to attendance at Board and Committee meetings. The fees and expenses of the Trustees are allocated to the respective series of the Trust on the basis of asset size.

     The following table shows the compensation earned by the non-interested Trustees for the fiscal year ended July 31, 1999 and the aggregate compensation paid to them from all registered investment companies advised by the Manager and its affiliate, MLAM ("MLAM/FAM-advised funds"), for the calendar year ended December 31, 1998.

Compensation From Fund

Pension or
Retirement Benefits
Accrued as Part of
Fund Expense

Estimated Annual Benefits upon Retirement

(1)

15

     Trustees of the Trust may purchase Class A shares of the Fund at net asset value. See "Purchase of Shares — Initial Sales Charge Alternatives — Class A and ClassD Shares — Reduced Initial Sales Charges — Purchase Privilege of Certain Persons."

Management and Advisory Arrangements

     Management Services. The Manager provides the Fund with investment advisory and management services. Subject to the supervision of the Trustees, the Manager is responsible for the actual management of the Fund's portfolio and constantly reviews the Fund's holdings in light of its own research analysis and that from other relevant sources. The responsibility for making decisions to buy, sell or hold a particular security rests with the Manager. The Manager performs certain of the other administrative services and provides all the office space, facilities, equipment and necessary personnel for management of the Trust and the Fund.

     Management Fee. The Trust has entered into a management agreement on behalf of the Fund with the Manager (the "Management Agreement"), pursuant to which the Manager receives for its services to the Fund monthly compensation at the annual rate of 0.55% of the average daily net assets not exceeding $500 million; 0.525% of the average daily net assets exceeding $500 million but not exceeding $1.0 billion and 0.50% of the average daily net assets exceeding $1.0 billion. The table below sets forth information about the total management fees paid by the Fund to the Manager for the periods indicated.

     Payment of Fund Expenses. The Management Agreement obligates the Manager to provide investment advisory services and to pay all compensation of and furnish office space for officers and employees of the Trust connected with investment and economic research, trading and investment management of the Trust, as well as the fees of all Trustees of the Trust who are affiliated persons of ML & Co. or any of its affiliates. The Fund pays all other expenses incurred in its operation and a portion of the Trust's general administrative expenses allocated on the basis of the asset size of the respective series of the Trust ("Series"). Expenses that will be borne directly by the Series include redemption expenses, expenses of portfolio transactions, expenses of registering the shares under federal and state securities laws, pricing costs (including the daily calculation of net asset value), expenses of printing shareholder reports, prospectuses and statements of additional information, except to the extent paid by Merrill Lynch Funds Distributor, a division of PFD (the "Distributor") as described below, fees for legal and auditing services, Commission fees, interest, certain taxes and other expenses attributable to a particular Series. Expenses that will be allocated on the basis of asset size of the respective Series include fees and expenses of non-interested Trustees, state franchise taxes, costs of printing proxies and other expenses relating to shareholder meetings and other expenses properly payable by the Trust. The organizational expenses of the Trust were paid by the Trust, and if additional Series are added to the Trust, the organizational expenses will be allocated among the Series in a manner deemed equitable by the Trustees. Depending upon the nature of a lawsuit, litigation costs may be assessed to the specific Series to which the lawsuit relates or allocated on the basis of the asset size of the respective Series. The Trustees have determined that this is an appropriate method of allocation of expenses. Accounting services are provided to the Trust by the Manager and the Trust reimburses the Manager for its costs in connection with such services. As required by the Fund's distribution agreements, the Distributor will pay the promotional expenses of the Fund incurred in connection with the offering of shares of the Fund. Certain expenses in connection with the account maintenance and distribution of Class B and Class C shares will be financed by the Trust pursuant to the Distribution Plans in compliance with Rule 12b-1 under the Investment Company Act. See "Purchase of Shares — Distribution Plans." Reference is made to "Management of the Fund" in the Prospectus for certain information concerning the management and advisory arrangements of the Trust.

16

     Duration and Termination. Unless earlier terminated as described herein, the Management Agreement will remain in effect from year to year if approved annually (a) by the Trustees of the Trust or by a majority of the outstanding shares of the Fund and (b) by a majority of the Trustees who are not parties to such contract or interested persons (as defined in the Investment Company Act) of any such party. Such contracts are not assignable and may be terminated without penalty on 60 days' written notice at the option of either party or by vote of the shareholders of the Fund.

     Transfer Agency Services. Financial Data Services, Inc. (the "Transfer Agent"), a subsidiary of ML & Co., acts as the Trust's Transfer Agent pursuant to a Transfer Agency, Dividend Disbursing Agency and Shareholder Servicing Agency Agreement (the "Transfer Agency Agreement"). Pursuant to the Transfer Agency Agreement, the Transfer Agent is responsible for the issuance, transfer and redemption of shares and the opening and maintenance of shareholder accounts. Pursuant to the Transfer Agency Agreement, the Transfer Agent receives a fee of $11.00 per Class A or Class D account and $14.00 per Class B or Class C account and is entitled to reimbursement for certain transaction charges and out-of-pocket expenses incurred by the Transfer Agent under the Transfer Agency Agreement. Additionally, a $.20 monthly closed account charge will be assessed on all accounts which close during the calendar year. Application of this fee will commence the month following the month the account is closed. At the end of the calendar year, no further fees will be due. For purposes of the Transfer Agency Agreement, the term "account" includes a shareholder account maintained directly by the Transfer Agent and any other account representing the beneficial interest of a person in the relevant share class on a recordkeeping system, provided the recordkeeping system is maintained by a subsidiary of ML & Co.

     Distribution Expenses. The Fund has entered into four separate distribution agreements with the Distributor in connection with the continuous offering of each class of shares of the Fund (the "Distribution Agreements"). The Distribution Agreements obligate the Distributor to pay certain expenses in connection with the offering of each class of shares of the Fund. After the prospectuses, statements of additional information and periodic reports have been prepared, set in type and mailed to shareholders, the Distributor pays for the printing and distribution of copies thereof used in connection with the offering to dealers and investors. The Distributor also pays for other supplementary sales literature and advertising costs. The Distribution Agreements are subject to the same renewal requirements and termination provisions as the Management Agreement described above.

Code of Ethics

     The Board of Trustees of the Trust has adopted a Code of Ethics under Rule 17j-1 of the Investment Company Act that incorporates the Code of Ethics of the Manager (together, the "Codes"). The Codes significantly restrict the personal investing activities of all employees of the Manager and, as described below, impose additional, more onerous, restrictions on fund investment personnel.

     The Codes require that all employees of the Manager pre-clear any personal securities investment (with limited exceptions, such as government securities). The pre-clearance requirement and associated procedures are designed to identify any substantive prohibition or limitation applicable to the proposed investment. The substantive restrictions applicable to all employees of the Manager include a ban on acquiring any securities in a "hot" initial public offering and a prohibition from profiting on short-term trading in securities. In addition, no employee may purchase or sell any security that at the time is being purchased or sold (as the case may be), or to the knowledge of the employee is being considered for purchase or sale, by any fund advised by the Manager. Furthermore, the Codes provide for trading "blackout periods" which prohibit trading by investment personnel of the Fund within periods of trading by the Fund in the same (or equivalent) security (15 or 30 days depending upon the transaction).

17

additional incremental transfer agency costs resulting from the deferred sales charge arrangements. The contingent deferred sales charges ("CDSCs"), distribution fees and account maintenance fees that are imposed on Class B and Class C shares, as well as the account maintenance fees that are imposed on Class D shares, are imposed directly against those classes and not against all assets of the Fund and, accordingly, such charges do not affect the net asset value of any other class or have any impact on investors choosing another sales charge option. Dividends paid by the Fund for each class of shares are calculated in the same manner at the same time and differ only to the extent that account maintenance and distribution fees and any incremental transfer agency costs relating to a particular class are borne exclusively by that class. Each class has different exchange privileges. See "Shareholder Services — Exchange Privilege."

     Investors should understand that the purpose and function of the initial sales charges with respect to the Class A and Class D shares are the same as those of the CDSCs and distribution fees with respect to the Class B and Class C shares in that the sales charges and distribution fees applicable to each class provide for the financing of the distribution of the shares of the Fund. The distribution-related revenues paid with respect to a class will not be used to finance the distribution expenditures of another class. Sales personnel may receive different compensation for selling different classes of shares.

     The Merrill Lynch Select Pricing^SM System is used by more than 50 registered investment companies advised by MLAM or FAM. Funds advised by MLAM or FAM that utilize the Merrill Lynch Select Pricing^SM System are referred to herein as "Select Pricing Funds."

     The Fund or the Distributor may suspend the continuous offering of the Fund's shares of any class at any time in response to conditions in the securities markets or otherwise and may thereafter resume such offering from time to time. Any order may be rejected by the Fund or the Distributor. Neither the Distributor nor the dealers are permitted to withhold placing orders to benefit themselves by a price change. Merrill Lynch may charge its customers a processing fee (presently $5.35) to confirm a sale of shares to such customers. Purchases made directly through the Transfer Agent are not subject to the processing fee.

Initial Sales Charge Alternatives — Class A and Class D Shares

     Investors who prefer an initial sales charge alternative may elect to purchase Class D shares or, if an eligible investor, Class A shares. Investors choosing the initial sales charge alternative who are eligible to purchase Class A shares should purchase Class A shares rather than Class D shares because there is an account maintenance fee imposed on Class D shares. Investors qualifying for significantly reduced initial sales charges may find the initial sales charge alternative particularly attractive because similar sales charge reductions are not available with respect to the deferred sales charges imposed in connection with purchases of Class B or Class C shares. Investors not qualifying for reduced initial sales charges who expect to maintain their investment for an extended period of time also may elect to purchase Class A or Class D shares, because over time the accumulated ongoing account maintenance and distribution fees on Class B or Class C shares may exceed the initial sales charges and, in the case of Class D shares, the account maintenance fee. Although some investors who previously purchased Class A shares may no longer be eligible to purchase Class A shares of other Select Pricing Funds, those previously purchased Class A shares, together with Class B, Class C and Class D share holdings, will count toward a right of accumulation which may qualify the investor for a reduced initial sales charge on new initial sales charge purchases. In addition, the ongoing Class B and Class C account maintenance and distribution fees will cause Class B and Class C shares to have higher expense ratios, pay lower dividends and have lower total returns than the initial sales charge shares. The ongoing Class D account maintenance fees will cause Class D shares to have a higher expense ratio, pay lower dividends and have a lower total return than Class A shares.

18

it shall not include purchases by any group of individuals whose sole organizational nexus is that the participants therein are credit cardholders of a company, policyholders of an insurance company, customers of either a bank or broker-dealer or clients of an investment adviser.

     Class A shares are offered to a limited group of investors and also will be issued upon reinvestment of dividends on outstanding Class A shares. Investors who currently own Class A shares in a shareholder account are entitled to purchase additional Class A shares of the Fund in that account. Class A shares are available at net asset value to corporate warranty insurance reserve fund programs provided that the program has $3 million or more initially invested in Select Pricing Funds. Also eligible to purchase Class A shares in a shareholder account at net asset value are participants in certain investment programs including TMA^SM Managed Trusts to which Merrill Lynch Trust Company provides discretionary trustee services, collective investment trusts for which Merrill Lynch Trust Company serves as trustee and certain purchases made in connection with certain fee-based programs. In addition, Class A shares are offered at net asset value to ML & Co. and its subsidiaries and their directors and employees and to members of the Boards of MLAM-advised investment companies. Certain persons who acquired shares of certain MLAM-advised closed-end funds in their initial offerings who wish to reinvest the net proceeds from a sale of their closed-end fund shares of common stock in shares of the Fund also may purchase Class A shares of the Fund if certain conditions are met. In addition, Class A shares of the Fund and certain other Select Pricing Funds are offered at net asset value to shareholders of Merrill Lynch Senior Floating Rate Fund, Inc. and, if certain conditions are met, to shareholders of Merrill Lynch Municipal Strategy Fund, Inc. and Merrill Lynch High Income Municipal Bond Fund, Inc. who wish to reinvest the net proceeds from a sale of certain of their shares of common stock pursuant to a tender offer conducted by such funds in shares of the Fund and certain other Select Pricing Funds.

     To provide an example, assume an investor purchased 100 shares at $10 per share (at a cost of $1,000) and in the third year after purchase, the net asset value per share is $12 and, during such time, the investor has acquired 10 additional shares upon dividend reinvestment. If at such time the investor makes his or her first redemption of 50 shares (proceeds of $600), 10 shares will not be subject to a CDSC because of dividend reinvestment. With respect to the remaining 40 shares, the charge is applied only to the original cost of $10 per share and not to the increase in net asset value of $2 per share. Therefore, $400 of the $600 redemption proceeds will be charged at a rate of 2.0% (the applicable rate in the third year after purchase).

22

     Conversion of Class B Shares to Class D Shares. After approximately ten years (the "Conversion Period"), Class B shares will be converted automatically into Class D shares of the Fund. Class D shares are subject to an ongoing account maintenance fee of 0.10% of net assets but are not subject to the distribution fee that is borne by Class B shares. Automatic conversion of Class B shares into Class D shares will occur at least once each month (on the "Conversion Date") on the basis of the relative net asset value of the shares of the two classes on the Conversion Date, without the imposition of any sales load, fee or other charge. Conversion of Class B shares to Class D shares will not be deemed a purchase or sale of the shares for Federal income tax purposes.

     In addition, shares purchased through reinvestment of dividends on Class B shares also will convert automatically to Class D shares. The Conversion Date for dividend reinvestment shares will be calculated taking into account the length of time the shares underlying such dividend reinvestment shares were outstanding. If at the Conversion Date the conversion of Class B shares to Class D shares of the Fund in a single account will result in less than $50 worth of Class B shares being left in the account, all of the Class B shares of the Fund held in the account on the Conversion Date will be converted to Class D shares of the Fund.

     In general, Class B shares of equity Select Pricing Funds will convert approximately eight years after initial purchase and Class B shares of taxable and tax-exempt fixed income Select Pricing Funds will convert approximately ten years after initial purchase. If, during the Conversion Period, a shareholder exchanges Class B shares with an eight-year Conversion Period for Class B shares with a ten-year Conversion Period, or vice versa, the Conversion Period applicable to the Class B shares acquired in the exchange will apply and the holding period for the shares exchanged will be tacked on to the holding period for the shares acquired. The conversion period also may be modified for investors that participate in certain fee-based programs. See "Shareholder Services — Fee-Based Programs."

     Class B shareholders of the Fund exercising the exchange privilege described under "Shareholder Services — Exchange Privilege" will continue to be subject to the Fund's CDSC schedule if such schedule is higher than the CDSC schedule relating to the Class B shares acquired as a result of the exchange.

     Share certificates for Class B shares of the Fund to be converted must be delivered to the Transfer Agent at least one week prior to the Conversion Date applicable to those shares. In the event such certificates are not received by the Transfer Agent at least one week prior to the Conversion Date, the related Class B shares will convert to Class D shares on the next scheduled Conversion Date after such certificates are delivered.

     Class C shares that are redeemed within one year of purchase may be subject to a 1.0% CDSC charged as a percentage of the dollar amount subject thereto. In determining whether a Class C CDSC is applicable to a redemption, the calculation will be determined in the manner that results in the lowest possible rate being charged. The charge will be assessed on an amount equal to the lesser of the proceeds of redemption or the cost of the shares being redeemed. Accordingly, no Class C CDSC will be imposed on increases in net asset value above the initial purchase price. In addition, no Class C CDSC will be assessed on shares derived from reinvestment of dividends. It will be assumed that the redemption is first of shares held for over one year or shares acquired pursuant to reinvestment of dividends and then of shares held longest during the one-year period. A transfer of shares from a shareholder's account to another account will be assumed to be made in the same order as a redemption. The Class C CDSC may be waived in connection with involuntary termination of an account in which Fund shares are held and withdrawals through the Merrill Lynch Systematic Withdrawal Plan. See "Shareholder Services — Fee-Based Programs" and " — Systematic Withdrawal Plan." The Class C CDSC of the Fund and certain other MLAM-advised mutual funds may be waived with respect to Class C shares purchased by an investor with the net proceeds of a tender offer made by certain MLAM-advised closed end funds, including Merrill Lynch Senior Floating Rate Fund II, Inc. Such waiver is subject to the requirement that the tendered shares shall have been held by the investor for a minimum of one year and to such other conditions as are set forth in the prospectus for the related closed end fund.

23

Class B and Class C Sales Charge Information

* Additional Class B CDSCs payable to the Distributor may have been waived or converted to a contingent obligation in connection with a shareholder's participation in certain fee-based programs.

    Merrill Lynch compensates its Financial Consultants for selling Class B and Class C shares at the time of purchase from its own funds. Proceeds from the CDSC and the distribution fee are paid to the Distributor and are used in whole or in part by the Distributor to defray the expenses of dealers (including Merrill Lynch) related to providing distribution-related services to the Fund in connection with the sale of the Class B and Class C shares, such as the payment of compensation to financial consultants for selling Class B and Class C shares from the dealer's own funds. The combination of the CDSC and the ongoing distribution fee facilitates the ability of the Fund to sell the Class B and Class C shares without a sales charge being deducted at the time of purchase. See "Distribution Plans" below. Imposition of the CDSC and the distribution fee on Class B and Class C shares is limited by the NASD asset-based sales charge rule. See "Limitations on the Payment of Deferred Sales Charges" below.

Distribution Plans

    Reference is made to "Fees and Expenses" in the Prospectus for certain information with respect to the separate distribution plans for Class B, Class C and Class D shares pursuant to Rule 12b-1 under the Investment Company Act (each a "Distribution Plan") with respect to the account maintenance and/or distribution fees paid by the Fund to the Distributor with respect to such classes.

    The Distribution Plans for Class B, Class C and Class D shares each provides that the Fund pays the Distributor an account maintenance fee relating to the shares of the relevant class, accrued daily and paid monthly, at the annual rates of 0.25%, 0.25% and 0.10%, respectively, of the average daily net assets of the Fund attributable to shares of the relevant class in order to compensate the Distributor and Merrill Lynch (pursuant to a sub-agreement) in connection with account maintenance activities with respect to Class B, Class C and Class D shares. Each of those classes has exclusive voting rights with respect to the Distribution Plan adopted with respect to such class pursuant to which account maintenance and/or distribution fees are paid (except that Class B shareholders may vote upon any material changes to expenses charged under the Class D Distribution Plan).

    The Distribution Plans for Class B and Class C shares each provides that the Fund also pays the Distributor a distribution fee relating to the shares of the relevant class, accrued daily and paid monthly, at the annual rates of 0.25% and 0.35%, respectively, of the average daily net assets of the Fund attributable to the shares of the relevant class in order to compensate the Distributor and Merrill Lynch (pursuant to a sub-agreement) for providing shareholder and distribution services and bearing certain distribution-related expenses of the Fund, including payments to financial consultants for selling Class B and Class C shares of the Fund. The Distribution Plans relating to Class B and Class C shares are designed to permit an investor to purchase Class B and Class C shares through dealers without the assessment of an initial sales charge and at the same time permit the dealer to compensate its financial consultants in connection with the sale of the Class B and Class C shares.

24

shareholders. Each Distribution Plan further provides that, so long as the Distribution Plan remains in effect, the selection and nomination of non-interested Trustees shall be committed to the discretion of the non-interested Trustees then in office. In approving each Distribution Plan in accordance with Rule 12b-1, the non-interested Trustees concluded that there is reasonable likelihood that each Distribution Plan will benefit the Fund and its related class of shareholders. Each Distribution Plan can be terminated at any time, without penalty, by the vote of a majority of the non-interested Trustees or by the vote of the holders of a majority of the outstanding related class of voting securities of the Fund. A Distribution Plan cannot be amended to increase materially the amount to be spent by the Fund without the approval of the related class of shareholders and all material amendments are required to be approved by the vote of Trustees, including a majority of the non-interested Trustees who have no direct or indirect financial interest in the Distribution Plan, cast in person at a meeting called for that purpose. Rule 12b-1 further requires that the Fund preserve copies of the Distribution Plan and any report made pursuant to such plan for a period of not less than six years from the date of the Distribution Plan or such report, the first two years in an easily accessible place.

    Among other things, each Distribution Plan provides that the Distributor shall provide and the Trustees shall review quarterly reports of the disbursement of the account maintenance and/or distribution fees paid to the Distributor. Payments under the Distribution Plans are based on a percentage of average daily net assets attributable to the shares regardless of the amount of expenses incurred and, accordingly, distribution-related revenues from the Distribution Plans may be more or less than distribution-related expenses. Information with respect to the distribution-related revenues and expenses is presented to the Trustees for their consideration in connection with their deliberations as to the continuance of the Class B and Class C Distribution Plans annually, as of December 31 of each year, on a "fully allocated accrual" basis and quarterly on a "direct expense and revenue/cash" basis. On the fully allocated accrual basis, revenues consist of the account maintenance fees, distribution fees, the CDSCs and certain other related revenues, and expenses consist of financial consultant compensation, branch office and regional operation center selling and transaction processing expenses, advertising, sales promotion and marketing expenses, corporate overhead and interest expense. On the direct expense and revenue/cash basis, revenues consist of the account maintenance fees, distribution fees and CDSCs and the expenses consist of financial consultant compensation.

    As of December 31, 1998, the last date for which fully allocated accrual data is available, the fully allocated accrual expenses of the Distributor and Merrill Lynch for the period since the commencement of operations of Class B shares exceeded the fully allocated accrual revenues by approximately $885,000 (1.78% of Class B net assets at that date). As of July 31, 1999, direct cash revenues for the period since the commencement of operations of Class B shares exceeded direct cash expenses by $1,616,641 (3.78% of Class B net assets at that date). As of December 31, 1998, the fully allocated accrual expenses incurred by the Distributor and Merrill Lynch for the period since the commencement of operations of Class C shares exceeded the fully allocated accrual revenues by approximately $6,000 (.43% of Class C net assets at that date). As of July 31, 1999, direct cash revenues for the period since the commencement of operations of Class C shares exceeded direct cash expenses by $19,512 (1.96% of Class C net assets at that date).

    For the fiscal year ended July 31, 1999, the Fund paid the Distributor $________ pursuant to the Class B Distribution Plan (based on average daily net assets subject to such Class B Distribution Plan of approximately $_____ million), all of which was paid to Merrill Lynch for providing account maintenance and distribution-related activities and services in connection with Class B shares. For the fiscal year ended July 31, 1999, the Fund paid the Distributor $______ pursuant to the Class C Distribution Plan (based on average daily net assets subject to such Class C Distribution Plan of approximately $___ million), all of which was paid to Merrill Lynch for providing account maintenance and distribution-related activities and services in connection with Class C shares. For the fiscal year ended July 31, 1999, the Fund paid the Distributor $_______ pursuant to the Class D Distribution Plan (based on average daily net assets subject to such Class D Distribution Plan of approximately $_____ million), all of which was paid to Merrill Lynch for providing account maintenance activities in connection with Class D shares.

25

to the Fund, the maximum sales charge rule limits the aggregate of distribution fee payments and CDSCs payable by the Fund to (1) 6.25% of eligible gross sales of Class B shares and Class C shares, computed separately (defined to exclude shares issued pursuant to dividend reinvestments and exchanges), plus (2) interest on the unpaid balance for the respective class, computed separately, at the prime rate plus 1% (the unpaid balance being the maximum amount payable minus amounts received from the payment of the distribution fee and the CDSC). In connection with the Class B shares, the Distributor has voluntarily agreed to waive interest charges on the unpaid balance in excess of 0.50% of eligible gross sales. Consequently, the maximum amount payable to the Distributor (referred to as the "voluntary maximum") in connection with the Class B shares is 6.75% of eligible gross sales. The Distributor retains the right to stop waiving the interest charges at any time. To the extent payments would exceed the voluntary maximum, the Fund will not make further payments of the distribution fee with respect to Class B shares and any CDSCs will be paid to the Fund rather than to the Distributor; however, the Fund will continue to make payments of the account maintenance fee. In certain circumstances the amount payable pursuant to the voluntary maximum may exceed the amount payable under the NASD formula. In such circumstances payment in excess of the amount payable under the NASD formula will not be made.

    The following table sets forth comparative information as of July 31, 1999 with respect to the Class B and Class C shares of the Fund indicating the maximum allowable payments that can be made under the NASD maximum sales charge rule and, with respect to the Class B shares, the Distributor's voluntary maximum.

Provided to illustrate the extent to which the current level of distribution fee payments (not including any CDSC payments) is amortizing the unpaid balance. No assurance can be given that payments of the distribution fee will reach either the voluntary maximum (with respect to Class B shares) or the NASD maximum (with respect to Class B and Class C shares).

REDEMPTION OF SHARES

     The Fund is required to redeem for cash all shares of the Fund upon receipt of a written request in proper form. The redemption price is the net asset value per share next determined after the initial receipt of proper notice of redemption. Except for any CDSC that may be applicable, there will be no charge for redemption if the redemption request is sent directly to the Transfer Agent. Shareholders liquidating their holdings will receive upon redemption all dividends reinvested through the date of redemption.

     The value of shares at the time of redemption may be more or less than the shareholder's cost, depending in part on the market value of the securities held by the Fund at such time.

Redemption

     A shareholder wishing to redeem shares held with the Transfer Agent may do so without charge by tendering the shares directly to the Transfer Agent at Financial Data Services, Inc., PO Box 45289, Jacksonville, Florida 32232-5289. Redemption requests delivered other than by mail should be delivered to Financial Data Services, Inc., 4800 Deer Lake Drive East, Jacksonville, Florida 32246-6484. Proper notice of redemption in the case of shares deposited with the Transfer Agent may be accomplished by a written letter requesting redemption. Proper notice of redemption in the case of shares for which certificates have been issued may be accomplished by a written letter as noted above accompanied by certificates for the shares to be redeemed. Redemption requests should not be sent to the Fund. The redemption request in either event requires the signature(s) of all persons in whose name(s) the shares are registered, signed exactly as such name(s) appear(s) on the Transfer Agent's register. The signature on the redemption request may require a guarantee by an "eligible guarantor institution" as defined in Rule 17Ad-15 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), the existence and validity of which may be verified by the Transfer Agent through the use of industry publications. In the event a signature guarantee is required, notarized signatures are not sufficient. In general, signature guarantees are waived on redemptions of less than $50,000 as long as the following requirements are met: (i) all requests require the signature(s) of all persons in whose name(s) shares are recorded on the Transfer Agent's register; (ii) all checks must be mailed to the stencil address of record on the Transfer Agent's register and (iii) the stencil address must not have changed within 30 days. Certain rules may apply regarding certain account types such as but not limited to UGMA/UTMA accounts, Joint Tenancies With Rights of Survivorship, contra broker transactions, and institutional accounts. In certain instances, the Transfer Agent may require additional documents such as, but not limited to, trust instruments, death certificates, appointments as executor or administrator, or certificates of corporate authority. For shareholders redeeming directly with the Transfer Agent, payments will be mailed within seven days of receipt of a proper notice of redemption.

     At various times the Fund may be requested to redeem shares for which it has not yet received good payment (e.g., cash, Federal funds or certified check drawn on a United States bank). The Fund may delay or cause to be delayed the mailing of a redemption check until such time as it has assured itself that good payment (e.g., cash, Federal funds or certified check drawn on a United States bank) has been collected for the purchase of such Fund shares, which will not exceed 10 days.

Repurchase

     The Fund also will repurchase Fund shares through a shareholder's listed securities dealer. The Fund normally will accept orders to repurchase Fund shares by wire or telephone from dealers for their customers at the net asset value next computed after the order is placed. Shares will be priced at the net asset value calculated on the day the request is received, provided that the request for repurchase is submitted to the dealer prior to the regular close of business on the NYSE (generally, the NYSE closes at 4:00 p.m., Eastern time) and such request

27

is received by the Fund from such dealer not later than 30 minutes after the close of business on the NYSE on the same day. Dealers have the responsibility of submitting such repurchase requests to the Fund not later than 30 minutes after the close of business on the NYSE, in order to obtain that day's closing price.

     The foregoing repurchase arrangements are for the convenience of shareholders and do not involve a charge by the Fund (other than any applicable CDSC). Securities firms that do not have selected dealer agreements with the Distributor, however, may impose a transaction charge on the shareholder for transmitting the notice of repurchase to the Fund. Merrill Lynch may charge its customers a processing fee (presently $5.35) to confirm a repurchase of shares to such customers. Repurchases made directly through the Transfer Agent on accounts held at the Transfer Agent are not subject to the processing fee. The Fund reserves the right to reject any order for repurchase, which right of rejection might adversely affect shareholders seeking redemption through the repurchase procedure. However, a shareholder whose order for repurchase is rejected by the Fund may redeem Fund shares as set forth above.

Reinstatement Privilege — Class A and Class D Shares

     Shareholders who have redeemed their Class A or Class D shares of the Fund have a privilege to reinstate their accounts by purchasing Class A or Class D shares, as the case may be, of the Fund at net asset value without a sales charge up to the dollar amount redeemed. The reinstatement privilege may be exercised by sending a notice of exercise along with a check for the amount to be reinstated to the Transfer Agent within 30 days after the date the request for redemption was accepted by the Transfer Agent or the Distributor. Alternatively, the reinstatement privilege may be exercised through the investor's Merrill Lynch Financial Consultant within 30 days after the date the request for redemption was accepted by the Transfer Agent or the Distributor. The reinstatement will be made at the net asset value per share next determined after the notice of reinstatement is received and cannot exceed the amount of the redemption proceeds.

Determination of Net Asset Value

     Reference is made to "How Shares are Priced" in the Prospectus.

     The net asset value of the shares of all classes of the Fund is determined by the Manager once daily Monday through Friday after the close of business on the NYSE on each day the NYSE is open for trading. The NYSE generally closes at 4:00 p.m., Eastern time. The NYSE is not open for trading on New Year's Day, Martin Luther King, Jr. Day, Presidents' Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving Day and Christmas Day.

     Net asset value is computed by dividing the value of the securities held by the Fund plus any cash or other assets (including interest and dividends accrued but not yet received) minus all liabilities (including accrued expenses) by the total number of shares outstanding at such time, rounded to the nearest cent. Expenses, including the fees payable to the Manager and Distributor, are accrued daily.

     The per share net asset value of Class B, Class C and Class D shares generally will be lower than the per share net asset value of Class A shares, reflecting the daily expense accruals of the account maintenance, distribution and higher transfer agency fees applicable with respect to Class B and Class C shares, and the daily expense accruals of the account maintenance fees applicable with respect to the Class D shares; moreover, the per share net asset value of the Class B and Class C shares generally will be lower than the per share net asset value of Class D shares reflecting the daily expense accruals of the distribution fees and higher transfer agency fees applicable with respect to Class B and Class C shares of the Fund. The per share net asset value of Class C shares will generally be lower than the per share net asset value of Class B shares reflecting the daily expense accruals of the higher distribution fees applicable with respect to Class C shares. It is expected, however, that the per share net asset value of the four classes will tend to converge (although not necessarily meet) immediately after the payment of dividends or distributions, which will differ by approximately the amount of the expense accrual differentials between the classes.

28

     The Municipal Bonds and other portfolio securities in which the Fund invests are traded primarily in over-the-counter ("OTC") municipal bond and money markets and are valued at the last available bid price for long positions and at the last available ask price for short positions in the OTC market or on the basis of yield equivalents as obtained from one or more dealers that make markets in the securities. One bond is the "yield equivalent" of another bond when, taking into account market price, maturity, coupon rate, credit rating and ultimate return of principal, both bonds will theoretically produce an equivalent return to the bondholder. Financial futures contracts and options thereon, which are traded on exchanges, are valued at their settlement prices as of the close of such exchanges. Short-term investments with a remaining maturity of 60 days or less are valued on an amortized cost basis which approximates market value. Securities and assets for which market quotations are not readily available are valued at fair value as determined in good faith by or under the direction of the Trustees of the Trust, including valuations furnished by a pricing service retained by the Trust, which may utilize a matrix system for valuations. The procedures of the pricing service and its valuations are reviewed by the officers of the Trust under the general supervision of the Trustees.

Computation of Offering Price Per Share

     An illustration of the computation of the offering price for Class A, Class B, Class C and Class D shares of the Fund based on the value of the Fund's net assets and number of shares outstanding on July 31, 1999 is set forth below.

PORTFOLIO TRANSACTIONS

Transactions in Portfolio Securities

     Subject to obtaining the best net results, dealers who provide supplemental investment research (such as information concerning tax-exempt securities, economic data and market forecasts) to the Manager may receive

29

orders for transactions by the Fund. Information so received will be in addition to and not in lieu of the services required to be performed by the Manager under its Management Agreement and the expense of the Manager will not necessarily be reduced as a result of the receipt of such supplemental information. Supplemental investment research obtained from such dealers might be used by the Manager in servicing all of its accounts and all such research might not be used by the Manager in connection with the Fund. Consistent with the Conduct Rules of the NASD and policies established by the Trustees of the Trust, the Manager may consider sales of shares of the Fund as a factor in the selection of brokers or dealers to execute portfolio transactions for the Fund.

     Because of the affiliation of Merrill Lynch with the Manager, the Fund is prohibited from engaging in certain transactions involving such firm or its affiliates except pursuant to an exemptive order under the Investment Company Act. Included among such restricted transactions are purchases from or sales to Merrill Lynch of securities in transactions in which it acts as principal. Under an exemptive order, the Trust may effect principal transactions with Merrill Lynch in high quality, short-term, tax-exempt securities subject to conditions set forth in such order. Information regarding transactions executed pursuant to the exemptive order is set forth in the following table:

     The Fund may not purchase securities, including Municipal Bonds, during the existence of any underwriting syndicate of which Merrill Lynch is a member or in a private placement in which Merrill Lynch serves as placement agent except pursuant to procedures approved by the Trustees of the Trust which either comply with rules adopted by the Commission or with interpretations of the Commission staff. Rule 10f-3 under the Investment Company Act sets forth conditions under which the Fund may purchase Municipal Bonds from an underwriting syndicate of which Merrill Lynch is a member. The rule sets forth requirements relating to, among other things, the terms of an issue of Municipal Bonds purchased by the Fund, the amount of Municipal Bonds that may be purchased in any one issue and the assets of the Fund that may be invested in a particular issue.

     Section 11(a) of the Exchange Act generally prohibits members of the US national securities exchanges from executing exchange transactions for their affiliates and institutional accounts that they manage unless the member (i) has obtained prior express authorization from the account to effect such transactions, (ii) at least annually furnishes the account with a statement setting forth the aggregate compensation received by the member in effecting such transactions, and (iii) complies with any rules the Commission has prescribed with respect to the requirements of clauses (i) and (ii). To the extent Section 11(a) would apply to Merrill Lynch acting as a broker for the Fund in any of its portfolio transactions executed on any such securities exchange of which it is a member, appropriate consents have been obtained from the Fund and annual statements as to aggregate compensation will be provided to the Fund. Securities may be held by, or be appropriate investments for, the Fund as well as other funds or investment advisory clients of the Manager or MLAM.

     Because of different objectives or other factors, a particular security may be bought for one or more clients of the Manager or an affiliate when one or more clients of the Manager or an affiliate are selling the same security. If purchases or sales of securities arise for consideration at or about the same time that would involve the Fund or other clients or funds for which the Manager or an affiliate acts as manager transactions in such securities will be made, insofar as feasible, for the respective funds and clients in a manner deemed equitable to all. To the extent that transactions on behalf of more than one client of the Manager or an affiliate during the same period may increase the demand for securities being purchased or the supply of securities being sold, there may be an adverse effect on price.

30

SHAREHOLDER SERVICES

     The Trust offers a number of shareholder services and investment plans described below that are designed to facilitate investment in shares of the Fund. Full details as to each of such services, copies of the various plans and instructions as to how to participate in the various services or plans, or how to change options with respect thereto, can be obtained from the Fund, by calling the telephone number on the cover page hereof, or from the Distributor or Merrill Lynch.