MERRILL LYNCH MUNICIPAL STRATEGY FUND INC
497, 1999-02-23
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<PAGE>
PROSPECTUS
FEBRUARY 19, 1999
 
                  MERRILL LYNCH MUNICIPAL STRATEGY FUND, INC.
 
                                  COMMON STOCK
                               ------------------
 
    Merrill Lynch Municipal Strategy Fund, Inc. (the "Fund") is a continuously
offered, non-diversified, closed-end management investment company. The Fund's
investment objective is to provide shareholders with as high a level of current
income exempt from Federal income taxes as is consistent with its investment
policies. The Fund seeks to achieve its investment objective by investing
primarily in a portfolio of long-term, investment grade municipal obligations
the interest on which, in the opinion of bond counsel to the issuer, is exempt
from Federal income taxes. The Fund intends to invest at least 75% of its total
assets in municipal obligations that are rated investment grade or, if unrated,
are considered by the Fund's investment adviser to be of comparable quality. THE
FUND ALSO MAY INVEST UP TO 25% OF ITS TOTAL ASSETS IN MUNICIPAL OBLIGATIONS THAT
ARE RATED BELOW INVESTMENT GRADE (SOMETIMES REFERRED TO AS "JUNK BONDS") OR, IF
UNRATED, ARE CONSIDERED BY THE FUND'S INVESTMENT ADVISER TO BE OF COMPARABLE
QUALITY. The Fund may invest in certain tax-exempt securities that are
classified as "private activity bonds" that may subject certain investors in the
Fund to the alternative minimum tax. At times, the Fund may seek to hedge its
portfolio using options and futures transactions. There can be no assurance that
the investment objective of the Fund will be realized.
 
    Currently, there is no secondary market for the Fund's common stock. In
order to allow shareholders to sell shares, the Fund generally makes quarterly
tender offers for its shares. In a tender offer, the Fund buys back outstanding
shares of its common stock from shareholders who tender their shares during the
offer period at the Fund's net asset value on the last day of the offer. If the
Fund does not make a tender offer, investors may not be able to sell their
shares.
 
    The Fund intends to offer shares of preferred stock from time to time
representing up to approximately 35% of the Fund's capital including capital
raised by selling the preferred stock. As of the date of this Prospectus, the
Fund has outstanding an aggregate of 2,320 shares of its Auction Market
Preferred Stock-Registered Trademark-, Series A representing approximately 33%
of the Fund's capital. Investors should carefully consider the special risks
associated with leveraging the Fund's common stock before investing.
 
    Shares of common stock of the Fund are offered on a best efforts basis at a
price equal to the next determined net asset value per share without a front-end
sales charge. As of the date of this Prospectus, the Fund's net asset value per
share is $10.62. Shares may be purchased directly from Merrill Lynch Funds
Distributor, a division of Princeton Funds Distributor, Inc., and from other
selected securities dealers, including Merrill Lynch, Pierce, Fenner & Smith
Incorporated. Merrill Lynch may charge a processing fee (presently $5.35) for
confirming repurchases.
                           --------------------------
 
    THIS PROSPECTUS CONTAINS INFORMATION YOU SHOULD KNOW BEFORE INVESTING,
INCLUDING INFORMATION ABOUT RISKS. PLEASE READ IT BEFORE YOU INVEST AND KEEP IT
FOR FUTURE REFERENCE.
                           --------------------------
 
<TABLE>
<CAPTION>
                                                         PER SHARE             TOTAL
                                                     ------------------  ------------------
<S>                                                  <C>                 <C>                 <C>
Public Offering Price..............................        $10.62           $181,156,045
Sales Load.........................................         None                None
Proceeds, before expenses, to Fund.................        $10.62           $181,156,045
</TABLE>
 
    THE SECURITIES AND EXCHANGE COMMISSION HAS NOT APPROVED OR DISAPPROVED THESE
SECURITIES OR DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                           --------------------------
 
                  FUND ASSET MANAGEMENT -- INVESTMENT ADVISER
                 MERRILL LYNCH FUNDS DISTRIBUTOR -- DISTRIBUTOR
 
- ----------------
 
- -Registered Trademark- Registered trademark of Merrill Lynch & Co., Inc.
<PAGE>
                               PROSPECTUS SUMMARY
 
    THIS SUMMARY IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE DETAILED
INFORMATION INCLUDED IN THIS PROSPECTUS.
 
<TABLE>
<S>                                 <C>
THE FUND                            Merrill Lynch Municipal Strategy Fund, Inc. is a
                                    continuously offered, non-diversified, closed-end fund.
 
THE OFFERING                        Shares of common stock of the Fund are offered by the
                                    Distributor and other securities dealers, including
                                    Merrill Lynch, Pierce, Fenner & Smith Incorporated. The
                                    Fund offers its common stock at a price equal to the net
                                    asset value per share without a front-end sales charge.
 
                                    The minimum initial purchase is $1,000 and the minimum
                                    subsequent purchase is $50. The Fund reserves the right
                                    to waive or modify the initial and subsequent minimum
                                    investment requirements at any time. Any order may be
                                    rejected by the Distributor or the Fund.
 
INVESTMENT OBJECTIVE AND POLICIES   The investment objective of the Fund is to provide
                                    shareholders with as high a level of current income
                                    exempt from Federal income taxes as is consistent with
                                    its investment policies. The Fund seeks to achieve this
                                    objective by investing primarily in a portfolio of
                                    long-term investment grade municipal obligations the
                                    interest on which, in the opinion of bond counsel to the
                                    issuer, is exempt from Federal income taxes.
 
                                    INVESTMENT GRADE MUNICIPAL OBLIGATIONS. The Fund
                                    generally will invest at least 75% of its total assets
                                    in municipal obligations that are rated investment grade
                                    by one or more nationally recognized statistical rating
                                    organizations. The Fund may also buy unrated securities
                                    that the investment adviser considers to be of
                                    comparable quality.
 
                                    HIGH YIELD SECURITIES OR "JUNK" BONDS. The Fund may
                                    invest up to 25% of its total assets in municipal
                                    obligations that are rated below investment grade or, if
                                    unrated, are considered by the Fund's investment adviser
                                    to be of comparable quality. Such lower quality
                                    municipal obligations (sometimes referred to as "junk
                                    bonds") are frequently traded only in markets where the
                                    number of potential purchasers and sellers, if any, is
                                    very limited.
 
TENDER OFFERS                       Currently, there is no secondary market for the Fund's
                                    common stock and it is not expected that a secondary
                                    market will develop. To allow shareholders to sell their
                                    shares, the
</TABLE>
 
                                       2
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Board of Directors of the Fund intends to authorize
                                    tender offers each calendar quarter to purchase shares
                                    of the Fund's common stock from shareholders. In a
                                    tender offer, the Fund buys outstanding shares back from
                                    shareholders at the Fund's net asset value on the last
                                    day of the offer period.
 
                                    The Board of Directors is not required to authorize the
                                    making of a tender offer and there can be no assurance
                                    that a tender offer will be made during any particular
                                    quarter. If a tender offer is not made, shareholders may
                                    be unable to sell their shares. In addition, Merrill
                                    Lynch charges its customers a processing fee (presently
                                    $5.35) to confirm a repurchase of shares from such
                                    customers pursuant to a tender offer. Tenders made
                                    directly through the Distributor are not subject to the
                                    processing fee.
 
CONTINGENT DEFERRED SALES CHARGE    If shareholders sell shares back to the Fund during a
                                    tender offer and they have held those shares for less
                                    than three years when the tender offer begins, they may
                                    have to pay a contingent deferred sales charge. This
                                    charge varies depending on how long a shareholder has
                                    owned the tendered shares. The amount of the charge is
                                    based on how much the shareholder paid for the tendered
                                    shares or their net asset value, whichever amount is
                                    less.
 
LEVERAGE                            ISSUANCE OF PREFERRED STOCK. From time to time, the Fund
                                    may issue preferred stock. The preferred stock may
                                    represent up to 35% of the Fund's capital, including the
                                    capital raised by issuing the preferred stock. As of the
                                    date of this Prospectus, the Fund has outstanding an
                                    aggregate of 2,320 shares of its Series A AMPS,
                                    representing approximately 33% of its capital. There can
                                    be no assurance, however, that preferred stock
                                    representing any particular percentage of the Fund's
                                    capital will actually be issued. Issuing preferred stock
                                    results in the leveraging of the Fund's common stock.
 
                                    The Series A AMPS pay dividends that are generally
                                    adjusted every seven days. The Series A AMPS dividend
                                    rate is based upon prevailing interest rates for debt
                                    obligations of comparable maturity. The money raised by
                                    the issuance of the Series A AMPS has been invested in
                                    longer-term obligations in accordance with the Fund's
                                    investment objective.
 
                                    The Fund may issue additional shares of its Series A
                                    AMPS or other preferred stock in the future. The Fund
                                    expects that other preferred stock issued will pay
                                    dividends that will be
</TABLE>
 
                                       3
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    adjusted over either relatively short-term periods
                                    (generally seven to 28 days) or medium-term periods (up
                                    to five years). The dividend rates on any additional
                                    preferred stock issued will be based upon prevailing
                                    interest rates for debt obligations of comparable
                                    maturities. The money raised by any additional preferred
                                    stock issued will be invested in longer-term obligations
                                    in accordance with the Fund's investment objective.
 
                                    The expenses of the preferred stock are borne by the
                                    Fund and reduce the net asset value of the common stock.
                                    In addition, at times when the Fund is required to
                                    allocate taxable income to preferred stockholders, the
                                    Series A AMPS may require, and it is expected that the
                                    terms of any other preferred stock may also require, the
                                    Fund to make an additional distribution to the preferred
                                    stockholders (an Additional Distribution). The amount of
                                    this Additional Distribution approximately equals the
                                    tax liability resulting from the allocation and the
                                    additional distribution. So long as the Fund has
                                    preferred stock outstanding, the Fund will pay fees to
                                    the investment adviser for its services that are higher
                                    than if the Fund did not issue preferred stock because
                                    the fees will be calculated on the basis of the Fund's
                                    average daily net assets, including proceeds from the
                                    sale of preferred stock.
 
                                    POTENTIAL BENEFITS OF LEVERAGE. Under normal market
                                    conditions, longer term obligations produce higher
                                    yields than short term and medium term obligations. The
                                    Fund's investment adviser believes that the interest
                                    income the Fund receives from its long term investments
                                    will exceed the amount of interest the Fund must pay to
                                    the preferred stockholders. Thus, the Fund's use of
                                    preferred stock should provide common stockholders with
                                    a higher yield than they would receive if the Fund were
                                    not leveraged.
 
                                    RISKS. The use of leverage creates certain risks for
                                    common stockholders, including higher volatility of both
                                    the net asset value and the market value of the common
                                    stock. Since any decline in the value of the Fund's
                                    investments will affect only the common stockholders, in
                                    a declining market the use of leverage will cause the
                                    Fund's net asset value to decrease more than it would if
                                    the Fund were not leveraged. A decrease in net asset
                                    value will likely also cause a decline in the market
                                    price of the shares of common stock. In addition,
                                    fluctuations in dividend rates paid on, and the amount
                                    of
</TABLE>
 
                                       4
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    taxable income allocable to, the Series A AMPS and any
                                    other preferred stock will affect the yield to common
                                    stockholders. There can be no assurance that the Fund
                                    will earn a higher return on its investments than the
                                    then current dividend rate (and any Additional
                                    Distribution) it pays on the preferred stock. Under
                                    certain conditions, the benefits of leverage to common
                                    stockholders will be reduced, and the Fund's leveraged
                                    capital structure could result in a lower rate of return
                                    to common stockholders than if the Fund were not
                                    leveraged.
 
                                    DISTRIBUTIONS. So long as the Series A AMPS and any
                                    other preferred stock are outstanding, common
                                    stockholders will receive all of the Fund's net income
                                    that remains after it pays dividends (and any Additional
                                    Distribution) on the Series A AMPS and any other
                                    preferred stock and generally will be entitled to a pro
                                    rata share of net realized capital gains. If the Fund is
                                    liquidated, preferred stockholders will be entitled to
                                    receive liquidating distributions before any
                                    distribution is made to common stockholders. These
                                    liquidating distributions are expected to equal the
                                    original purchase price per share of the preferred stock
                                    plus any accumulated and unpaid dividends and Additional
                                    Distributions.
 
                                    REDEMPTION OF PREFERRED STOCK. The Fund may redeem
                                    preferred stock for any reason. For example, the Fund
                                    may redeem all or part of the preferred stock if it
                                    believes that the Fund's leveraged capital structure
                                    will cause common stockholders to obtain a lower return
                                    than they would if the common stock were unleveraged for
                                    any significant amount of time.
 
                                    VOTING RIGHTS. Preferred stockholders, voting as a
                                    separate class, are entitled to elect two of the Fund's
                                    Directors. Common and preferred stockholders, voting
                                    together as a single class, are entitled to elect the
                                    remaining Directors. If the Fund fails to pay dividends
                                    to the preferred stockholders for two full years, the
                                    holders of all outstanding shares of preferred stock,
                                    voting as a separate class, would then be entitled to
                                    elect a majority of the Fund's Directors. The preferred
                                    stockholders vote separately on certain other matters as
                                    required under the Fund's Articles of Incorporation, the
                                    Investment Company Act of 1940, as amended, and Maryland
                                    law. Otherwise, holders of preferred stock and common
                                    stock have equal voting rights (one vote per share) and
                                    will vote together as a single class.
</TABLE>
 
                                       5
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    RATINGS. The Series A AMPS have been rated "aaa" by
                                    Moody's Investor's Services, Inc. and AAA by Standard &
                                    Poor's. Before it offers any other preferred stock, the
                                    Fund intends to apply to one or more nationally
                                    recognized statistical ratings organizations for ratings
                                    on the preferred stock. The Fund believes that a rating
                                    for the preferred stock will make it easier to market
                                    the stock, which should reduce the dividend rate.
 
INVESTMENT ADVISER AND              Fund Asset Management, L.P., is the Fund's investment
  ADMINISTRATOR                     adviser and provides investment advisory and
                                    administrative services to the Fund. For its advisory
                                    services, the Fund pays the investment adviser a monthly
                                    fee at the annual rate of 0.50% of the Fund's average
                                    daily net assets, including any assets acquired from the
                                    sale of preferred stock. For its administrative
                                    services, the Fund pays the investment adviser a monthly
                                    fee at the annual rate of 0.25% of the Fund's average
                                    daily net assets, including assets acquired from the
                                    sale of preferred stock. While the combined advisory and
                                    administrative fees are higher than those paid by most
                                    funds, they are similar to those paid by other
                                    continuously offered closed-end funds.
 
DIVIDENDS AND DISTRIBUTIONS         Each month the Fund intends to distribute substantially
                                    all of its net investment income remaining after the
                                    payment of dividends (and any Additional Distribution)
                                    on the Series A AMPS and any other preferred stock to
                                    common stockholders. The Fund will distribute net
                                    capital gains, if any, at least annually on a pro rata
                                    basis to common stockholders and preferred stockholders.
                                    When the Fund allocates capital gains or other taxable
                                    income to preferred stockholders under certain
                                    circumstances, the terms of the Series A AMPS may
                                    require, and it is expected that the terms of any other
                                    preferred stock may require, the Fund to make an
                                    Additional Distribution. The Fund may not declare any
                                    cash dividend or other distribution on its common stock
                                    unless the preferred stock has asset coverage of at
                                    least 200%. As of the date of this Prospectus, the
                                    Series A AMPS represent approximately 33% of the Fund's
                                    capital and the asset coverage with respect to the
                                    Series A AMPS is approximately 300%. If the Fund's
                                    ability to make distributions on its common stock is
                                    limited, the Fund may not be able to maintain its
                                    qualification for taxation as a regulated investment
                                    company. This would have adverse tax consequences for
                                    common stockholders.
</TABLE>
 
                                       6
<PAGE>
 
<TABLE>
<S>                                 <C>
AUTOMATIC DIVIDEND REINVESTMENT     Dividends and capital gains distributions generally are
  PLAN                              used to purchase additional shares of the Fund's common
                                    stock. However, an investor can choose to receive
                                    distributions in cash. Since not all investors can
                                    participate in the automatic dividend reinvestment plan,
                                    you should contact your broker or nominee to confirm
                                    that you are eligible to participate in the plan.
 
MUTUAL FUND INVESTMENT OPTION       Investors who sell their shares pursuant to a tender
                                    offer have the option, subject to certain conditions, to
                                    purchase Class D shares of certain Merrill Lynch funds
                                    with the proceeds from the sale.
</TABLE>
 
                                       7
<PAGE>
                    RISK FACTORS AND SPECIAL CONSIDERATIONS
 
    LIQUIDITY OF SHARES.  The Fund is designed primarily for long-term investors
and should not be considered a vehicle for trading purposes. Currently, there is
no secondary market for the Fund's common stock and it is not expected that one
will develop. Moreover, Merrill Lynch and other selected dealers are prohibited
from making a market in the Fund's common stock while the Fund is either
offering or making a tender offer for its common stock.
 
    To allow shareholders to sell their shares, the Board of Directors of the
Fund intends to consider making tender offers once each quarter to repurchase
the Fund's shares at net asset value. However, the Fund's shares are less liquid
than shares of funds traded on a stock exchange, and shareholders who tender
Fund shares held for less than three years may pay a contingent deferred sales
charge. The Fund's Board is not obligated to authorize any tender offer, and
there may be quarters in which no tender offer is made. If the Board does not
authorize a tender offer, shareholders may be unable to sell their shares.
Closed-end funds that trade in a secondary market are subject to the risk that
the market price of the shares may be lower than the net asset value, commonly
referred to as "trading at a discount." As long as there is no secondary market
for the Fund's shares, the Fund is not subject to this risk.
 
    INTEREST RATE AND CREDIT RISK.  The Fund invests in municipal bonds, which
are subject to interest rate and credit risk. Interest rate risk is the risk
that prices of municipal bonds generally increase when interest rates decline
and decrease when interest rates increase. Prices of longer term securities
generally change more in response to interest rate changes than prices of
shorter term securities. Credit risk is the risk that the issuer will be unable
to pay the interest or principal when due. The degree of credit risk depends on
both the financial condition of the issuer and the terms of the obligation.
 
    NON-DIVERSIFICATION.  The Fund is registered as a "non-diversified"
investment company. This means that the Fund may invest a greater percentage of
its assets in a single issuer than can a diversified investment company. Even as
a non-diversified fund, the Fund must still meet the diversification
requirements of applicable Federal income tax laws. Since the Fund may invest a
relatively high percentage of its assets in a limited number of issuers, the
Fund may be more exposed to any single economic, political or regulatory
occurrence than a more widely-diversified fund.
 
    INVESTMENT GRADE BONDS.  The Fund generally invests at least 75% of its
total assets in municipal obligations that are rated in the investment grade
rating categories by S&P, Moody's or Fitch IBCA, Inc. or, if not rated, are
considered to be of comparable quality by the Investment Adviser. Obligations
rated in the lowest investment-grade category have certain speculative
characteristics.
 
    HIGH YIELD SECURITIES OR "JUNK BONDS."  The Fund may invest up to 25% of its
total assets in debt securities commonly known as junk bonds. Junk bonds are
debt securities that are rated below investment grade by the major rating
agencies or are unrated securities that the Fund's Investment Adviser 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. Junk bonds generally are less
liquid and experience more price volatility than higher rated bonds. The issuers
of junk bonds may have a larger amount of outstanding debt relative to their
assets
 
                                       8
<PAGE>
than issuers of investment grade bonds. In the event of an issuer's bankruptcy,
claims of other creditors may have priority over the claims of junk bond
holders, leaving few or no assets available to repay junk bond holders. Junk
bonds may be subject to greater call and redemption risk than higher rated debt
securities.
 
    High yield securities also tend to be more sensitive to economic conditions
than investment grade securities. A general economic downturn or a sustained
period of rising interest rates likely will have a greater impact on the
financial condition of a high yield bond issuer.
 
    Negative publicity and investor perceptions also may reduce the value and
liquidity of high yield securities. When the market value of high yield
securities goes down the Fund's net asset value is also likely to go down. In
addition, the Fund may incur additional expenses if it is forced to seek
recovery upon a default of a portfolio holding or if it participates in the
restructuring of the obligation.
 
    PRIVATE ACTIVITY BONDS.  The Fund may invest all or a portion of its assets
in certain tax-exempt securities classified as "private activity bonds." These
bonds subject certain investors in the Fund to the alternative minimum tax.
 
    LEVERAGE.  The Fund has 2,320 shares of Series A AMPS outstanding and may
offer other shares of preferred stock. As of the date of this Prospectus, the
Series A AMPS represent approximately 33% of the Fund's capital including
capital raised by issuing the Series A AMPS. Leverage creates certain risks for
common stockholders, including higher volatility of both the net asset value and
the market value of the common stock. Leverage also creates the risk that the
investment return on shares of the Fund's common stock will be reduced to the
extent the dividends paid on preferred stock and other expenses of the preferred
stock exceed the income earned by the Fund on its investments. If the Fund is
liquidated, preferred stockholders will be entitled to receive liquidating
distributions before any distribution is made to common stockholders.
 
    INDEXED AND INVERSE FLOATING RATE SECURITIES.  The Fund may invest in
securities whose potential returns are directly related to changes in an
underlying index or interest rate, known as indexed securities. The return on
indexed securities will rise when the underlying index or interest rate rises
and fall when the index or interest rate falls. The Fund may also invest in
securities whose return is inversely related to changes in an interest rate
(inverse floaters). In general, income on inverse floaters will decrease when
short term interest rates increase and increase when short term interest rates
decrease. Investments in inverse floaters may subject the Fund to the risks of
reduced or eliminated interest payments and losses of principal. In addition,
certain indexed securities and inverse floaters may increase or decrease in
value at a greater rate than the underlying interest rate, which effectively
leverages the Fund's investment. As a result, the market value of such
securities will generally be more volatile than that of fixed rate, tax exempt
securities. Both indexed securities and inverse floaters are derivative
securities and can be considered speculative.
 
    OPTIONS AND FUTURES TRANSACTIONS.  The Fund may seek to hedge its portfolio
against changes in interest rates using options and financial futures contracts.
The Fund's hedging transactions are designed to reduce volatility, but come at
some cost. For example, the Fund may try to limit its risk of loss from a
decline in price of a portfolio security by purchasing a put option. However,
the Fund must
 
                                       9
<PAGE>
pay for the option, and the price of the security may not in fact drop. In large
part, the success of the Fund's hedging activities depends on its ability to
forecast movements in securities prices and interest rates. The Fund does not,
however, intend to enter into options and futures transactions for speculative
purposes. The Fund is not required to hedge its portfolio and may not do so.
 
    RATING AGENCY GUIDELINES.  The Fund is subject to certain investment
restrictions imposed by guidelines of the two nationally recognized statistical
rating organizations that have issued ratings for the Series A AMPS. Any other
preferred stock issued may subject the Fund to similar investment restrictions.
These guidelines may impose asset coverage or portfolio composition requirements
that are more stringent than those imposed by the 1940 Act. The Fund does not
expect these requirements or guidelines to prevent the investment adviser from
managing the Fund's portfolio in accordance with the Fund's investment objective
and policies.
 
    ANTITAKEOVER PROVISIONS.  The Fund's Articles of Incorporation include
provisions that could limit the ability of other entities or persons to acquire
control of the Fund or to change the composition of its Board of Directors. Such
provisions could limit the ability of shareholders to sell their shares at a
premium over prevailing market prices by discouraging a third party from seeking
to obtain control of the Fund.
 
                                       10
<PAGE>
                                   FEE TABLE
 
<TABLE>
<S>                                                                   <C>
SHAREHOLDER TRANSACTION EXPENSES
  Maximum Sales Load (as a percentage of offering price)............  None
  Dividend Reinvestment Plan Fees...................................  None
  Contingent Deferred Sales Charge (as a percentage of original
    purchase price or net asset value at the time of
    repurchase)(a)..................................................  3.0% during the first
                                                                      year, decreasing 1.0%
                                                                      annually thereafter to
                                                                      0.0% after the third
                                                                      year
 
ANNUAL EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS
  ATTRIBUTABLE TO SHARES OF COMMON STOCK)
  Investment Advisory Fee(b)(e).....................................  0.72%
  Shareholder Servicing Fee(c)......................................  0.12%
  Interest Payments on Borrowed Funds...............................  None
  Other Expenses(d)(e)..............................................  0.95%
                                                                      ----------------------
    Total Annual Expenses...........................................  1.79%
                                                                      ----------------------
                                                                      ----------------------
</TABLE>
 
- ------------------------
(a) See "Contingent Deferred Sales Charge"--page 33.
 
(b) See "Risks and Special Considerations of Leverage"--page 24 and "Investment
    Advisory and Administrative Arrangements"--page 37.
 
(c) See "Transfer Agent, Dividend Disbursing Agent, and Shareholder Servicing
    Agent"--page 53.
 
(d) Includes administrative fees, which are payable to the Investment Adviser by
    the Fund at the rate of 0.25% of net assets attributable to common shares.
    See "Investment Advisory and Administrative Arrangements"--page 37.
 
(e) As of the date of this Prospectus, the Fund has utilized leverage by issuing
    Series A AMPS in an amount representing approximately 33% of the Fund's
    capital. If the Fund were not leveraged, it is estimated that, as a
    percentage of net assets attributable to Common Stock, the Investment
    Advisory Fee would be 0.50%, Shareholder Servicing Fee would be 0.08%, Other
    Expenses would be 0.66% and Total Expenses would be 1.24%. See "Risks and
    Special Considerations of Leverage"--page 24 and "Investment Advisory and
    Administrative Arrangements"--page 37.
 
<TABLE>
<CAPTION>
EXAMPLE                                                                          1 YEAR       3 YEARS      5 YEARS     10 YEARS
- -----------------------------------------------------------------------------  -----------  -----------  -----------  -----------
<S>                                                                            <C>          <C>          <C>          <C>
An investor would pay the following expenses on a $1,000 investment assuming,
 (1) total annual expenses of 1.79%, (2) a 5% annual return throughout the
 periods and (3) tender at the end of the period.............................   $      48*   $      66*   $      97    $     211
An investor would pay the following expenses on a $1,000 investment assuming
 no tender at the end of the period..........................................   $      18    $      56    $      97    $     211
</TABLE>
 
- ------------------------
 
*   Reflects the contingent deferred sales charge.
 
                                       11
<PAGE>
    The Fee Table is intended to assist investors in understanding the costs and
expenses that a shareholder in the Fund will bear directly or indirectly. The
expenses set forth under "Other Expenses" are based on estimated amounts through
the end of the Fund's current fiscal year. The example set forth above assumes
reinvestment of all dividends and distributions and uses a 5% annual rate of
return as mandated by Securities and Exchange Commission regulations. THE
EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES OR
ANNUAL RATES OF RETURN, AND ACTUAL EXPENSES OR ANNUAL RATES OF RETURN MAY BE
MORE OR LESS THAN THOSE ASSUMED FOR PURPOSES OF THE EXAMPLE. Merrill Lynch,
Pierce, Fenner & Smith Incorporated ("Merrill Lynch") may charge its customers a
processing fee (presently $5.35) for confirming purchases and repurchases.
Purchases and repurchases made directly through the Distributor are not subject
to the processing fee.
 
                                       12
<PAGE>
                              FINANCIAL HIGHLIGHTS
 
    The financial information in the table below has been audited in conjunction
with the annual audits of the financial statements of the Fund by Deloitte &
Touche LLP, independent auditors. Financial statements for the fiscal year ended
October 31, 1998 and the independent auditors' report thereon appear in the
annual report of the Fund for the fiscal year ended October 31, 1998, which is
incorporated by reference herein. Further information about the performance of
the Fund is contained in the annual report, which may be obtained, without
charge, by writing the Fund at the address on the inside back cover of this
Prospectus or by calling (609) 282-2800.
 
    The following per share data and ratios are derived from information
provided in the Fund's audited financial statements.
 
<TABLE>
<CAPTION>
                                                                                                      FOR THE
                                                                                                      PERIOD
                                                                               FOR THE YEAR         NOVEMBER 3,
                                                                                  ENDED                1995+
                                                                               OCTOBER 31,              TO
INCREASE (DECREASE) IN NET ASSET                                         ------------------------   OCTOBER 31,
VALUE PER SHARE OF COMMON STOCK:                                            1998         1997          1996
- -----------------------------------------------------------------------  -----------  -----------  -------------
<S>                                                                      <C>          <C>          <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period...................................   $   10.87    $   10.17     $   10.00
                                                                         -----------  -----------  -------------
Investment income--net.................................................         .73          .75           .68
Realized and unrealized gain on investments--net.......................         .35          .70           .21
                                                                         -----------  -----------  -------------
Total from investment operations.......................................        1.08         1.45           .89
                                                                         -----------  -----------  -------------
Less dividends and distributions to Common Stock shareholders:
  Investment income--net...............................................        (.60)        (.59)         (.59)
  Realized gain on investments--net....................................        (.19)          --            --
                                                                         -----------  -----------  -------------
Total dividends and distributions to Common Stock shareholders.........        (.79)        (.59)         (.59)
                                                                         -----------  -----------  -------------
Effect of Preferred Stock activity:++
  Dividends and distributions to Preferred Stock shareholders:
  Investment income--net...............................................        (.13)        (.16)         (.09)
  Realized gain on investments--net....................................        (.07)          --            --
  Capital charge resulting from issuance of Preferred Stock............          --           --          (.04)
                                                                         -----------  -----------  -------------
Total effect of Preferred Stock activity...............................        (.20)        (.16)         (.13)
                                                                         -----------  -----------  -------------
Net asset value, end of period.........................................   $   10.96    $   10.87     $   10.17
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
TOTAL INVESTMENT RETURN:**
  Based on net asset value per share...................................        8.28%       13.08%         7.81%#
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
RATIOS TO AVERAGE NET ASSETS:***
Expenses, net of reimbursement.........................................        1.12%         .96%          .53%*
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
Expenses...............................................................        1.25%        1.28%         1.26%*
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
Investment income--net.................................................        4.61%        5.01%         5.40%*
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
SUPPLEMENTAL DATA:
Net assets, net of Preferred Stock, end of period (in thousands).......   $ 115,339    $ 101,463     $  83,573
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
Preferred Stock outstanding, end of period (in thousands)..............   $  48,000    $  48,000     $  38,000
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
Portfolio turnover.....................................................      141.53%      144.34%       234.41%
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
LEVERAGE:
Asset coverage per $1,000 of Preferred Stock...........................   $   3,403    $   3,114     $   3,199
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
DIVIDENDS PER SHARE ON PREFERRED STOCK OUTSTANDING:
Investment income--net.................................................   $     533    $     897     $     564
                                                                         -----------  -----------  -------------
                                                                         -----------  -----------  -------------
</TABLE>
 
- ------------------------------
*   Annualized.
**  Total investment returns exclude the effects of the CDSC per share of common
    stock, if any. The Fund is a continuously offered closed-end fund, the
    shares of which are offered at net asset value. Therefore, no separate
    market exists.
*** Do not reflect the effect of dividends to Preferred Stock shareholders.
+   Commencement of operations.
++  The Fund's Preferred Stock initially was issued on March 11, 1996.
#  Aggregate total investment return.
 
                                       13
<PAGE>
                                    THE FUND
 
    Merrill Lynch Municipal Strategy Fund, Inc. (the "Fund") is a continuously
offered, non-diversified, closed-end management investment company. The Fund was
incorporated under the laws of the State of Maryland on July 13, 1994, and has
registered as an investment company under the Investment Company Act of 1940, as
amended (the "1940 Act"). The Fund's principal office is located at 800 Scudders
Mill Road, Plainsboro, New Jersey 08536, and its telephone number is (609)
282-2800.
 
                       INVESTMENT OBJECTIVE AND POLICIES
 
    The investment objective of the Fund is to provide shareholders with as high
a level of current income exempt from Federal income taxes as is consistent with
its investment policies. The Fund seeks to achieve its investment objective by
investing primarily in a portfolio of long-term, investment grade municipal
obligations, the interest on which, in the opinion of bond counsel to the
issuer, is exempt from Federal income taxes. The investment objective of the
Fund is a fundamental policy of the Fund and may not be changed without the
approval of a majority of the outstanding voting securities of the Fund, as
defined below under "Investment Restrictions." There can be no assurance that
the investment objective of the Fund will be realized. At times, the Fund may
seek to hedge its portfolio through the use of futures transactions and options
to reduce volatility in the net asset value of its shares of common stock.
 
    The Fund at all times, except during interim and temporary periods as
discussed below, will invest at least 80% of its total assets in a portfolio of
obligations issued by or on behalf of states, territories and possessions of the
United States and their political subdivisions, agencies or instrumentalities
that pay interest which, in the opinion of bond counsel to the issuer, is exempt
from Federal income taxes ("Municipal Bonds"). The Fund at all times, except
during temporary defensive periods, will maintain at least 75% of its total
assets in Municipal Bonds that are rated investment grade by a nationally
recognized statistical rating organization or, if unrated, are considered to be
of comparable quality by the Investment Adviser. Additionally, the Fund may
invest up to 25% of its total assets in Municipal Bonds that are rated below
investment grade by a nationally recognized statistical rating organization or,
are unrated, but considered by the Investment Adviser to be of comparable
quality. The Fund has established no minimum percentage of assets that must be
invested in such lower quality Municipal Bonds. Such lower quality Municipal
Bonds are frequently traded only in markets where the number of potential
purchasers and sellers, if any, is very limited. The Fund may invest in certain
tax-exempt securities classified as "private activity bonds' (in general, bonds
that benefit non-governmental entities) that may subject certain investors in
the Fund to an alternative minimum tax. The Fund will not invest more than 25%
of its total assets (taken at market value) in Municipal Bonds whose issuers are
located in the same state.
 
    The Fund also may invest in securities not issued by or on behalf of a state
or territory or by an agency or instrumentality thereof, if the Fund
nevertheless believes such securities pay interest or distributions that are
exempt from Federal income taxation ("Non-Municipal Tax-Exempt Securities").
Non-Municipal Tax-Exempt Securities may include securities issued by other
investment companies that invest in Municipal Bonds, to the extent such
investments are permitted by the 1940 Act. Other Non-
 
                                       14
<PAGE>
Municipal Tax-Exempt Securities could include trust certificates or other
instruments evidencing interests in one or more long-term Municipal Bonds.
Certain Non-Municipal Tax-Exempt Securities may be characterized as derivative
instruments. Non-Municipal Tax-Exempt Securities will be considered "Municipal
Bonds" for purposes of the Fund's investment objective and policies.
 
    Investment in shares of the Fund's common stock offers several potential
benefits. The Fund offers investors the opportunity to receive income exempt
from Federal income taxes by investing in a professionally managed portfolio
comprised primarily of investment grade Municipal Bonds. The Fund also relieves
the investor of the burdensome administrative details involved in managing a
portfolio of Municipal Bonds. Additionally, the Investment Adviser will seek to
enhance the yield on the common stock by leveraging the Fund's capital structure
through the issuance of preferred stock. These benefits are at least partially
offset by the expenses involved in operating an investment company. Such
expenses primarily consist of the investment advisory and administrative fees
and operational costs. Additionally, the use of leverage involves certain
expenses and special risk considerations. See "Risks and Special Considerations
of Leverage."
 
    The investment grade Municipal Bonds in which the Fund will invest are those
Municipal Bonds rated at the date of purchase in the four highest rating
categories of Standard & Poor's ("S&P"), Moody's Investors Services, Inc.
("Moody's") or Fitch IBCA, Inc. ("Fitch") or, if unrated, considered to be of
comparable quality by the Investment Adviser. In the case of long-term debt, the
investment grade rating categories are AAA through BBB for S&P, Aaa through Baa
for Moody's and AAA through BBB for Fitch. In the case of short-term notes, the
investment grade rating categories are SP-1+ through SP-3 for S&P, MIG-1 through
MIG-3 for Moody's and F-1+ through F-3 for Fitch. In the case of tax-exempt
commercial paper, the investment grade rating categories are A-1+ through A-3
for S&P, Prime-1 through Prime-3 for Moody's and F-1+ through F-3 for Fitch.
Obligations ranked in the lowest investment grade rating category (BBB, SP-3 and
A-3 for S&P; Baa, MIG-3 and Prime-3 for Moody's; and BBB, F-3 and F-3 for
Fitch), while considered "investment grade," have certain speculative
characteristics. There may be sub-categories or gradations indicating relative
standing within the rating categories set forth above. See Appendix I to this
Prospectus for a description of S&P's, Moody's and Fitch's ratings of Municipal
Bonds. In assessing the quality of Municipal Bonds with respect to the foregoing
requirements, the Investment Adviser will take into account the nature of any
letters of credit or similar credit enhancements to which particular Municipal
Bonds are entitled and the creditworthiness of the financial institution that
provided the credit enhancement.
 
    As noted above, the Fund may invest up to 25% of its assets in Municipal
Bonds that are rated below investment grade or, if unrated, are considered to be
of comparable quality by the Investment Adviser. These high yield bonds are
commonly referred to as "junk bonds" and are regarded as predominantly
speculative as to the issuer's ability to make payments of principal and
interest. Consequently, although such bonds can be expected to provide higher
yields and be less subject to interest rate fluctuations, they may be subject to
greater market price fluctuations and risk of loss of principal than lower
yielding, higher rated fixed income securities. Such securities are particularly
vulnerable to adverse changes in the issuer's industry and in general economic
conditions. Issuers of high yield bonds may be highly leveraged and may not have
available to them more traditional methods of financing. The risk of loss due to
default by the issuer is significantly greater for the holders of these bonds
 
                                       15
<PAGE>
because such securities may be unsecured and may be subordinated to other
creditors of the issuer. In addition, while the high yield bonds in which the
Fund may invest normally will not include securities that, at the time of
investment, are in default or the issuers of which are in bankruptcy, there can
be no assurance that such events will not occur after the Fund purchases a
particular security, in which case the Fund may experience losses and incur
costs.
 
    High yield bonds frequently have call or redemption features that permit an
issuer to repurchase such bonds from the Fund, which may decrease the net
investment income to the Fund and dividends to shareholders in the event that
the Fund is required to replace a called security with a lower yielding
security. The Fund may have difficulty disposing of certain high yield bonds
because there may be a thin trading market for such securities. Reduced
secondary market liquidity may have an adverse impact on market price and the
Fund's ability to dispose of particular issues when necessary to meet the Fund's
liquidity needs or in response to a specific economic event such as a
deterioration in the creditworthiness of the issuer. In addition, market
quotations are generally available on many high yield bond issues only from a
limited number of dealers and may not necessarily represent firm bids of such
dealers or prices for actual sales.
 
    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 Board of Directors and the Investment Adviser 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
institutions.
 
    The Fund's investments may also include 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,
typically a commercial bank. The VRDOs in which the Fund will invest are
tax-exempt obligations in the opinion of counsel to the issuer that contain a
floating or variable interest rate adjustment formula and an unconditional right
of demand on the part of the holder thereof to receive payment of the unpaid
principal balance plus accrued interest on a short notice period not to exceed
seven days. Participating VRDOs provide the Fund with a specified undivided
interest (up to 100%) in 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 on a specified number of
days' notice, not to exceed seven days. There is, however, the possibility that
because of default or insolvency, the demand feature of VRDOs or Participating
VRDOs may not be honored. 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.
 
    The average maturity of the Fund's portfolio securities will vary based upon
the Investment Adviser's assessment of economic and market conditions. The net
asset value of the shares of common stock of a closed-end investment company,
such as the Fund, which invests primarily in fixed-income securities, changes as
the general levels of interest rates fluctuate. When interest rates decline, the
value of a fixed-income portfolio can be expected to rise. Conversely, when
interest rates rise, the value of a fixed-income portfolio can be expected to
decline. Prices of longer-term securities generally fluctuate more in response
to interest rate changes than do short-term or medium-term securities. These
changes in net asset value are likely to be greater in the case of a fund having
a leveraged capital structure, such as that used by the Fund. See "Risks and
Special Considerations of Leverage."
 
                                       16
<PAGE>
    The Fund intends to invest primarily in long-term Municipal Bonds with a
maturity of more than ten years. Also, the Fund may invest in intermediate-term
Municipal Bonds with a maturity of between three years and ten years. The Fund
may invest in short-term, tax-exempt securities, short-term U.S. Government
securities, repurchase agreements or cash. Such short-term securities or cash
will not exceed 20% of its total assets except during interim periods pending
investment of the net proceeds of public offerings of the Fund's securities or
in anticipation of the repurchase or redemption of the Fund's securities and
temporary periods when, in the opinion of the Investment Adviser, prevailing
market or economic conditions warrant. The Fund does not ordinarily intend to
realize significant interest income not exempt from Federal income tax.
 
    The Fund is classified as non-diversified within the meaning of the 1940
Act, which means that the Fund is not limited by such Act in the proportion of
its assets that it may invest in securities of a single issuer. However, the
Fund's investments will be limited so as to qualify the Fund as a "regulated
investment company" for purposes of the Federal tax laws. See "Taxes." To
qualify, among other requirements, the Fund will limit its 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
(other than U.S. Government 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 (other than
U.S. Government securities) of a single issuer. A fund that elects to be
classified as "diversified" under the 1940 Act must satisfy the foregoing 5%
requirement with respect to 75% of its total assets. To the extent that the Fund
assumes large positions in the securities of a small number of issuers, the
Fund's yield may fluctuate to a greater extent than that of a diversified
company as a result of changes in the financial condition or in the market's
assessment of the issuers.
 
DESCRIPTION OF MUNICIPAL BONDS
 
    Municipal Bonds include primarily debt obligations issued to obtain funds
for various public purposes, including construction and equipping of a wide
range of public facilities, refunding of outstanding obligations and obtaining
funds for general operating expenses and loans to other public institutions and
facilities. In addition, certain types of industrial development bonds are
issued by or on behalf of public authorities to finance various privately
operated facilities, including certain local facilities for water supply, gas,
electricity, sewage or solid waste disposal. For purposes of this Prospectus,
such obligations are Municipal Bonds if the interest paid thereon is exempt from
Federal income tax, even though such bonds may be industrial development bonds
("IDBs") or "private activity bonds" as discussed below. Also, for purposes of
this Prospectus, Non-Municipal Tax-Exempt Securities as discussed above will be
considered Municipal Bonds.
 
    The two principal classifications of Municipal Bonds are "general
obligation" bonds and "revenue" or "special obligation" bonds, which latter
category includes IDBs and, for bonds issued after August 15, 1986, private
activity bonds. General obligation bonds are secured by the issuer's pledge of
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 state constitutions or laws, and an
 
                                       17
<PAGE>
entity's credit will depend on many factors, including potential erosion of the
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. Revenue or special
obligation bonds are payable only from the revenues derived from a particular
facility or class of facilities or, in some cases, from the proceeds of a
special excise tax or other specific revenue source such as from the user of the
facility being financed. IDBs are in most cases revenue bonds and generally are
not secured by a pledge of the credit or taxing power of the issuer of such
bonds. The payment of the principal and interest on such industrial development
bonds depends solely on the ability of the user of the facility financed by the
bonds to meet its financial obligations and the pledge, if any, of real and
personal property so financed as security for such payment. Municipal Bonds also
may include "moral obligation" bonds, which normally are 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.
 
    The Fund may purchase Municipal Bonds classified as "private activity bonds"
(in general, bonds that benefit non-governmental entities). Interest received on
certain tax-exempt securities that are classified as "private activity bonds"
may subject certain investors in the Fund to the alternative minimum tax. There
is no limitation on the percentage of the Fund's assets that may be invested in
private activity bonds. See "Taxes."
 
    Federal tax legislation has limited the types and volume of bonds qualifying
for a Federal income tax exemption of interest. 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.
 
    Also included within the general category of Municipal Bonds are
participation certificates issued by government authorities or entities to
finance the acquisition or construction of equipment, land and/ or facilities.
The certificates represent participations in a lease, an installment purchase
contract or a conditional sales contract (hereinafter collectively referred to
as "lease obligations") relating to such equipment, land or facilities. Although
lease obligations do not constitute general obligations of the issuer for which
the issuer's unlimited taxing power is pledged, a lease obligation frequently is
backed by the issuer's covenant to budget for, appropriate and make the payments
due under the lease obligation. However, certain lease obligations contain
"non-appropriation" clauses, which provide that the issuer has no obligation to
make lease or 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 relatively new type of financing that has not yet developed the
depth of marketability associated with more conventional securities.
 
                                       18
<PAGE>
OTHER INVESTMENT POLICIES
 
    The Fund has adopted certain other policies as set forth below:
 
    BORROWINGS.  The Fund is authorized to borrow money in amounts of up to 5%
of the value of its total assets at the time of such borrowings; provided,
however, that the Fund is authorized to borrow moneys in amounts of up to
33 1/3% of the value of its total assets at the time of such borrowings to
finance the repurchase of its own common stock pursuant to tender offers, if
any, or otherwise, to redeem or repurchase shares of preferred stock or for
temporary, extraordinary or emergency purposes. Borrowings by the Fund (commonly
known, as with the issuance of preferred stock, as "leveraging") create an
opportunity for greater total return since the Fund will not be required to sell
portfolio securities to purchase tendered shares but, at the same time, increase
exposure to capital risk. In addition, borrowed funds are subject to interest
costs that may offset or exceed the return earned on the borrowed funds.
 
    WHEN-ISSUED SECURITIES AND DELAYED DELIVERY TRANSACTIONS.  The Fund may
purchase or sell Municipal Bonds on a delayed delivery basis or on a when-issued
basis at fixed purchase or sale terms. These transactions arise when securities
are purchased or sold by the Fund with payment and delivery taking place in the
future. The purchase will be recorded on the date the Fund enters into the
commitment, and the value of the obligation will thereafter be reflected in the
calculation of the Fund's net asset value. The value of the obligation on the
delivery date may be more or less than its purchase price. A separate account of
the Fund will be established with its custodian consisting of cash, cash
equivalents or liquid Municipal Bonds having a market value at all times at
least equal to the amount of the forward commitment.
 
    INDEXED AND INVERSE FLOATING OBLIGATIONS.  The Fund may invest in Municipal
Bonds yielding a return based on a particular index of value or interest rates.
For example, the Fund may invest in Municipal Bonds that pay interest based on
an index of Municipal Bond interest rates. The principal amount payable upon
maturity of certain Municipal Bonds also may be based on the value of an index.
To the extent the Fund invests in these types of Municipal Bonds, the Fund's
return on such Municipal Bonds will be subject to risk with respect to the value
of the particular index. 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 in the
secondary market synthetically-created inverse floating rate bonds evidenced by
custodial or trust receipts. Generally, income from 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 that
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 generally will 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. The Investment Adviser believes
 
                                       19
<PAGE>
that indexed and inverse floating obligations represent a flexible portfolio
management instrument for the Fund that allows the Investment Adviser to vary
the degree of investment leverage relatively efficiently under different market
conditions.
 
    CALL RIGHTS.  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 the 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.
 
    REPURCHASE AGREEMENTS.  The Fund may invest in Municipal Bonds and U.S.
Government securities pursuant to repurchase agreements. Repurchase agreements
may be entered into only with a member bank of the Federal Reserve System or a
primary dealer in U.S. Government securities. Under such agreements, the bank or
primary dealer 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. The Fund may not invest
more than 15% of its total assets in repurchase agreements maturing in more than
seven days. In the event of default by the seller under a repurchase agreement,
the Fund may suffer time delays and incur costs or possible losses in connection
with the disposal of the collateral.
 
    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.
 
OPTIONS AND FUTURES TRANSACTIONS
 
    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 common
stock, the net asset value of the common stock will fluctuate. There can be no
assurance that the Fund's hedging transactions will be effective. In addition,
because of the anticipated leveraged nature of the common stock, hedging
transactions will result in a larger impact on the net asset value of the common
stock than would be the case if the common stock were not leveraged.
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 is under no obligation to use hedging
transactions and may not do so.
 
    Gains from transactions in options and futures contracts that are
distributed to shareholders are taxable as ordinary income or, in certain
circumstances, as long-term capital gains to shareholders. See "Taxes-- Tax
Treatment of Options and Futures Transactions." In addition, in order to obtain
ratings of the preferred stock from one or more nationally recognized
statistical rating organizations, the Fund may be required to limit its use of
hedging techniques in accordance with the specified guidelines of such
organizations.
 
                                       20
<PAGE>
    The following is a description of the options and futures transactions in
which the Fund may engage, limitations on the use of such transactions and risks
associated therewith. The investment policies with respect to the hedging
transactions of the Fund are not fundamental policies and may be modified by the
Board of Directors of the Fund without the approval of the Fund's shareholders.
 
    WRITING COVERED CALL OPTIONS.  The Fund may write (i.e., sell) covered call
options with respect to Municipal Bonds it owns, thereby giving the holder of
the option the right to buy the underlying security covered by the option from
the Fund at the stated exercise price until the option expires. The Fund writes
only covered call options, which means that so long as the Fund is obligated as
the writer of a call option, it will own the underlying securities subject to
the option. The Fund may not write covered call options on underlying securities
in an amount exceeding 15% of the market value of its total assets.
 
    The Fund receives a premium from writing a call option that increases the
Fund's return on the underlying security in the event the option expires
unexercised or is closed out at a profit. By writing a call, the Fund limits its
opportunity to profit from an increase in the market value of the underlying
security above the exercise price of the option for as long as the Fund's
obligation as a writer continues. Covered call options serve as a partial hedge
against a decline in the price of the underlying security. The Fund may engage
in closing transactions in order to terminate outstanding options that it has
written.
 
    PURCHASE OF OPTIONS.  The Fund may purchase put options in connection with
its hedging activities. By buying a put the Fund has a right to sell the
underlying security at the exercise price, thus limiting the Fund's risk of loss
through a decline in the market value of the security until the put expires. The
amount of any appreciation in the value of the underlying security will be
partially offset by the amount of the premium paid for the put option and any
related transaction costs. Prior to its expiration, a put option may be sold in
a closing sale transaction; profit or loss from the sale will depend on whether
the amount received is more or less than the premium paid for the put option
plus the related transaction costs. A closing sale transaction cancels out the
Fund's position as the purchaser of an option by means of an offsetting sale of
an identical option prior to the expiration of the option it has purchased. In
certain circumstances, the Fund may purchase call options on securities held in
its portfolio on which it has written call options or on securities that it
intends to purchase. The Fund will not purchase options on securities if, as a
result of such purchase, the aggregate cost of all outstanding options on
securities held by the Fund would exceed 5% of the market value of the Fund's
total assets.
 
    FINANCIAL FUTURES CONTRACTS AND OPTIONS.  The Fund is authorized to purchase
and sell financial futures contracts and options thereon solely for the purposes
of hedging its investments in Municipal Bonds against declines in value and
hedging against increases in the cost of securities it intends to purchase. 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 financial futures
contracts, to make and accept a cash settlement, at a specific future time for a
specified price. 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
 
                                       21
<PAGE>
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 financial futures contracts.
 
    The purchase or sale of a financial 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 equal to
approximately 5% of the contract amount must be deposited with the broker. This
amount is known as initial margin. Subsequent payments to and from the broker,
called variation margin, are made on a daily basis as the price of the financial
futures contract fluctuates making the long and short positions in the financial
futures contract more or less valuable.
 
    The Fund may purchase and sell financial futures contracts based on The Bond
Buyer Municipal Bond Index, a price-weighted measure of the market value of 40
large recently issued tax-exempt bonds, and purchase and sell put and call
options on such financial futures contracts for the purpose of hedging Municipal
Bonds that the Fund holds or anticipates purchasing against adverse changes in
interest rates. The Fund also may purchase and sell financial futures contracts
on U.S. Government securities and purchase and sell put and call options on such
financial futures contracts for such hedging purposes. With respect to U.S.
Government securities, currently there are financial futures contracts based on
long-term U.S. Treasury bonds, Treasury notes, GNMA Certificates and three-month
U.S. Treasury bills.
 
    Subject to policies adopted by the Board of Directors, the Fund also may
engage in transactions in other financial futures contracts transactions and
options thereon, such as financial futures contracts or options on other
municipal bond indices that may become available, if the Investment Adviser and
the Directors of the Fund should determine that there is normally a sufficient
correlation between the prices of such financial futures contracts and the
Municipal Bonds in which the Fund invests to make such hedging appropriate.
 
    OVER-THE-COUNTER OPTIONS.  The Fund may engage in options and futures
transactions on exchanges and in the over-the-counter markets. In general,
exchange-traded contracts are third-party contracts (i.e., performance of the
parties' obligations is guaranteed by an exchange or clearing corporation) with
standardized strike prices and expiration dates. Over-the-counter options ("OTC
options") transactions are two-party contracts with price and terms negotiated
by the buyer and seller. See "Restrictions on OTC Options" below for information
as to restrictions on the use of OTC options.
 
    RESTRICTIONS ON OTC OPTIONS.  The Fund will engage in OTC options only with
member banks of the Federal Reserve System and primary dealers in U.S.
Government securities or with affiliates of such banks or dealers that have
capital of at least $50 million or whose obligations are guaranteed by an entity
having capital of at least $50 million or any other bank or dealer having
capital of at least $150 million or whose obligations are guaranteed by an
entity having capital of at least $150 million. OTC options and assets used to
cover OTC options written by the Fund are considered by the staff of the
Commission to be illiquid. The illiquidity of such options or assets may prevent
a successful sale of such options or assets, result in a delay of sale, or
reduce the amount of proceeds that might otherwise be realized.
 
                                       22
<PAGE>
    RISK FACTORS IN OPTIONS AND FUTURES TRANSACTIONS.  Utilization of futures
transactions involves the risk of imperfect correlation in movements in the
price of financial futures contracts and movements in the price of the security
that is the subject of the hedge. If the price of the financial futures contract
moves more or less than the price of the security that is the subject of the
hedge, the Fund will experience a gain or loss that will not be completely
offset by movements in the price of such security. There is a risk of imperfect
correlation where the securities underlying financial futures contracts have
different maturities, ratings, geographic compositions or other characteristics
than the security being hedged. In addition, the correlation may be affected by
additions to or deletions from the index that serves as a basis for a financial
futures contract. Finally, in the case of futures contracts on U.S. Government
securities and options on such futures contracts, the anticipated correlation of
price movements between the U.S. Government securities underlying the futures or
options and Municipal Bonds may be adversely affected by economic, political,
legislative or other developments that have a disparate impact on the respective
markets for such securities.
 
    Under regulations of the Commodity Futures Trading Commission (the "CFTC"),
the futures trading activities described herein will not result in the Fund
being deemed a "commodity pool," as defined under such regulations, provided
that the Fund adheres to certain restrictions. In particular, the Fund may
purchase and sell financial futures contracts and options thereon (i) for bona
fide hedging purposes, as defined under CFTC regulations, without regard to the
percentage of the Fund's assets committed to margin and option premiums, and
(ii) for non-hedging purposes if, immediately thereafter, the sum of the amount
of initial margin deposits on the Fund's existing futures positions and option
premiums entered into for non-hedging purposes do not exceed 5% of the market
value of the liquidation value of the Fund's portfolio, after taking into
account unrealized profits and unrealized losses on any such transactions.
Margin deposits may consist of cash or securities acceptable to the broker and
the relevant contract market.
 
    When the Fund purchases a financial futures contract, or writes a put option
or purchases a call option thereon, it will maintain an amount of cash, cash
equivalents (e.g., commercial paper and daily tender adjustable notes) or
short-term, high-grade, fixed-income 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 financial futures contract, thereby ensuring that the use of such financial
futures contract is unleveraged. It is not anticipated that transactions in
futures contracts will have the effect of increasing portfolio turnover.
 
    Although certain risks are involved in options and futures transactions, the
Investment Adviser believes that, because the Fund engages in options and
futures transactions only for hedging purposes, the options and futures
portfolio strategies of the Fund do not subject the Fund to certain risks
frequently associated with speculation in options and futures transactions.
 
    The volume of trading in the exchange markets with respect to Municipal Bond
options may be limited, and it is impossible to predict the amount of trading
interest that may exist in such options. In addition, there can be no assurance
that viable exchange markets will continue to be available.
 
    The Fund intends to enter into options and futures transactions, on an
exchange or in the over-the-counter market, only if there appears to be a liquid
secondary market for such options or futures.
 
                                       23
<PAGE>
There can be no assurance, however, that a liquid secondary market will exist at
any specific time. Thus, it may not be possible to close an options or futures
transaction. The inability to close options and futures positions also could
have an adverse impact on the Fund's ability to effectively hedge its portfolio.
There is also the risk of loss by the Fund of margin deposits or collateral in
the event of bankruptcy of a broker with whom the Fund has an open position in
an option or financial futures contract.
 
    The liquidity of a secondary market in a financial futures contract may be
adversely affected by "daily price fluctuation limits" established by commodity
exchanges which limit the amount of fluctuation in a financial 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.
 
    If it is not possible to close a financial futures position entered into by
the Fund, the Fund would continue to be required to make daily cash payments of
variation margin in the event of adverse price movements. In such a situation,
if the Fund has insufficient cash, it may have to sell portfolio securities to
meet daily variation margin requirements at a time when it may be
disadvantageous to do so.
 
    The successful use of these transactions also depends on the ability of the
Investment Adviser to forecast correctly the direction and extent of interest
rate movements within a given time frame. To the extent these rates remain
stable during the period in which a futures contract is held by the Fund or move
in a direction opposite to that anticipated, the Fund may realize a loss on the
hedging transaction that 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.
Furthermore, the Fund will only engage in hedging transactions from time to time
and may not necessarily be engaging in hedging transactions when movements in
interest rates occur.
 
                  RISKS AND SPECIAL CONSIDERATIONS OF LEVERAGE
 
EFFECTS OF LEVERAGE
 
    From time to time, the Fund may issue preferred stock representing up to
approximately 35% of the Fund's capital, including capital raised through the
sale of the preferred stock. As of the date of this Prospectus, the Fund has
2,320 shares of its Series A AMPS outstanding, representing approximately 33% of
its capital. There can be no assurance, however, that preferred stock
representing any particular percentage of the Fund's capital will actually be
issued. Issuing preferred stock leverages the Fund's common stock. The Series A
AMPS pay dividends that are generally adjusted every seven days and the dividend
rate of the Series A AMPS is based upon prevailing interest rates for debt
obligations of comparable maturity. The proceeds from the sale of the Series A
AMPS were invested in longer-term obligations in accordance with the Fund's
investment objective, as will be the proceeds of the issuance of any additional
shares of preferred stock. The Fund may issue additional shares of its Series A
AMPS or other preferred stock in the future. Other preferred stock will pay
dividends that will be adjusted over either relatively short-term periods
(generally seven to 28 days) or medium-term periods (up to five years) and the
dividend rates thereon will be based upon prevailing interest rates for
 
                                       24
<PAGE>
debt obligations of comparable maturities. Issuance and ongoing expenses of the
preferred stock will be borne by the Fund and will reduce the net asset value of
the common stock. Additionally, under certain circumstances, when the Fund is
required to allocate taxable income to holders of preferred stock, it is
anticipated that the terms of the preferred stock will require the Fund to make
an additional distribution to such holders in an amount approximately equal to
the tax liability resulting from such allocation and such additional
distribution (such amount, an "Additional Distribution"). Because under normal
market conditions, obligations with longer maturities produce higher yields than
short-term and medium-term obligations, the Investment Adviser believes that the
spread inherent in the difference between the short-term and medium-term rates
(and any Additional Distributions) paid by the Fund as dividends on the
preferred stock and the longer-term rates received by the Fund will provide
holders of common stock with a potentially higher yield. So long as the Fund has
preferred stock outstanding, the Fund will pay fees to the investment adviser
for its services that are higher than if the Fund did not issue preferred stock
because the fees will be calculated on the basis of the Fund's average daily net
assets, including proceeds from the sale of preferred stock.
 
    The use of leverage, however, involves certain risks to the holders of
common stock. For example, issuance of the preferred stock may result in higher
volatility of the net asset value of the common stock and potentially more
volatility in the market value of the common stock. In addition, fluctuations in
the short-term and medium-term dividend rates on, and the amount of taxable
income allocable to, the preferred stock will affect the yield to holders of
common stock. So long as the Fund, taking into account the costs associated with
the preferred stock and the Fund's operating expenses, is able to realize a
higher net return on its investment portfolio than the then current dividend
rate (and any Additional Distribution) of the preferred stock, the effect of
leverage will be to cause holders of common stock to realize a higher current
rate of return than if the Fund were not leveraged. Similarly, since a pro rata
portion of the Fund's net realized capital gains on its investment assets are
generally payable to holders of common stock, if net capital gains are realized
by the Fund, the effect of leverage will be to increase the amount of such gains
distributed to holders of common stock. However, short-term, medium-term and
long-term interest rates change from time to time as does their relationship to
each other (i.e., the slope of the yield curve) depending upon such factors as
supply and demand forces, monetary and tax policies and investor expectations.
Changes in such factors could cause the relationship between short-term,
medium-term and long-term rates to change (i.e., to flatten or to invert the
slope of the yield curve) so that short-term and medium-term rates may
substantially increase relative to the long-term obligations in which the Fund
may be invested. To the extent that the current dividend rate (and any
Additional Distribution) on the preferred stock approaches the net return on the
Fund's investment portfolio, the benefit of leverage to holders of common stock
will be reduced, and if the current dividend rate (and any Additional
Distribution) on the preferred stock were to exceed the net return on the Fund's
portfolio, the Fund's leveraged capital structure would result in a lower
current yield to holders of common stock than if the Fund were not leveraged.
Similarly, since both the costs associated with the issuance of preferred stock
and any decline in the value of the Fund's investments (including investments
purchased with the proceeds from any preferred stock offering) will be borne
entirely by holders of common stock, the effect of leverage in a declining
market would result in a greater decrease in net asset value to holders of
common stock than if the Fund were not leveraged.
 
                                       25
<PAGE>
    In an extreme case, a decline in net asset value could affect the Fund's
ability to pay dividends on the common stock. Failure to make such dividend
payments could adversely affect the Fund's qualification as a regulated
investment company under the Code. See "Taxes." The Fund intends, however, to
take all measures necessary to continue to make common stock dividend payments.
If the Fund's current investment income were not sufficient to meet dividend
requirements on either the common stock or the preferred stock, it could be
necessary for the Fund to liquidate certain of its investments. In addition, the
Fund will have the authority to redeem the preferred stock for any reason and
may redeem all or part of the preferred stock if (i) it anticipates that the
Fund's leveraged capital structure will result in a lower rate of return for any
significant amount of time to holders of the common stock than that obtainable
if the common stock were unleveraged, (ii) the asset coverage for the preferred
stock declines below 200%, either as a result of a decline in the value of the
Fund's portfolio investments or as a result of the repurchase of common stock in
tender offers, or (iii) in order to maintain the asset coverage guidelines
established by nationally recognized rating agencies rating the preferred stock.
Redemption of the preferred stock or insufficient investment income to make
dividend payments may reduce the net asset value of the common stock and require
the Fund to liquidate a portion of its investments at a time when it may be
disadvantageous, in the absence of such extraordinary circumstances, to do so.
As of the date of this Prospectus, the Fund has used leverage by issuing Series
A AMPS that pay dividends at a rate that generally will be adjusted every seven
days in an amount representing approximately 33% of the Fund's capital at an
annual dividend rate of 3.00% payable on such preferred stock based on market
rates as of the date of this Prospectus. The annual return that the Fund's
portfolio must experience (net of expenses) in order to cover such dividend
payments would be 1.00%.
 
    The following table is designed to illustrate the effect on the return to a
holder of the Fund's common stock of the leverage obtained by the issuance of
Series A AMPS representing approximately 33% of the Fund's capital, assuming
hypothetical annual returns on the Fund's portfolio of minus 10% to plus 10%. As
the table shows, leverage generally increases the return to stockholders when
portfolio return is positive and decreases the return when the portfolio return
is negative. The figures appearing in the table are hypothetical and actual
returns may be greater or less than those appearing in the table.
 
<TABLE>
<S>                                                                 <C>        <C>        <C>        <C>        <C>
Assumed Portfolio Return (net of expenses)........................        (10)%        (5)%         0%         5%        10%
Corresponding common stock Return.................................        (17)%        (9)%        (2)%         6%        14%
</TABLE>
 
    The leveraging of the common stock would be eliminated during any period
that preferred stock is not outstanding and the risks and special considerations
related to leverage described in this Prospectus would not apply.
 
PORTFOLIO MANAGEMENT AND OTHER CONSIDERATIONS
 
    In the event of an increase in short-term or medium-term rates or other
change in market conditions to the point where the Fund's leverage could
adversely affect holders of common stock as noted above, or in anticipation of
such changes, the Fund may attempt to shorten the average maturity of its
investment portfolio, which would tend to offset the negative impact of leverage
on holders of common
 
                                       26
<PAGE>
stock. The Fund also may attempt to reduce the degree to which it is leveraged
by redeeming preferred stock pursuant to the provisions of the Fund's Articles
Supplementary establishing the rights and preferences of the preferred stock or
otherwise purchasing shares of preferred stock. Purchases and redemptions of
preferred stock, whether through redemptions, on the open market or in
negotiated transactions, are subject to limitations under the 1940 Act. If
market conditions subsequently change, the Fund may sell previously unissued
shares of preferred stock or shares of preferred stock that the Fund previously
issued but later repurchased or redeemed.
 
    The Series A AMPS have been rated "aaa" by Moody's and AAA by S&P. Prior to
the time it offers additional preferred stock, the Fund intends to apply for
ratings on such preferred stock from one or more nationally recognized
statistical rating organizations. In order to obtain these ratings, the Fund may
be required to maintain portfolio holdings meeting specified guidelines of such
organizations. These guidelines may impose asset coverage requirements that are
more stringent than those imposed by the 1940 Act. It is not anticipated that
these guidelines will impede the Investment Adviser from managing the Fund's
portfolio in accordance with the Fund's investment objective and policies.
Ratings on preferred stock issued by the Fund should not be confused with
ratings on obligations held by the Fund.
 
    Under the 1940 Act, the Fund is not permitted to issue shares of preferred
stock unless immediately after such issuance the net asset value of the Fund's
portfolio is at least 200% of the liquidation value of the outstanding preferred
stock (expected to equal the original purchase price of the outstanding shares
of preferred stock plus any accumulated and unpaid dividends thereon and any
accumulated and unpaid Additional Distribution). In addition, the Fund is not
permitted to declare any cash dividend or other distribution on its common stock
unless, at the time of such declaration, the net asset value of the Fund's
portfolio (determined after deducting the amount of such dividend or
distribution) is at least 200% of such liquidation value. As of the date of this
Prospectus, the Fund's capital structure includes 2,320 shares of Series A AMPS
representing approximately 33% of the Fund's capital, and the asset coverage
with respect to the Series A AMPS is approximately 300%. To the extent possible,
the Fund intends to purchase or redeem shares of preferred stock from time to
time to maintain coverage of preferred stock of at least 200%.
 
    The Fund pays service fees to certain broker-dealers at the end of each
auction in connection with the Series A AMPS. For the period November 3, 1995
(commencement of operations) to October 31, 1996, the fiscal year ended October
31, 1997 and the fiscal year ended October 31, 1998, Merrill Lynch was paid
$48,107, $100,708 and $120,839, respectively, in service fees by the Fund.
 
                                       27
<PAGE>
                            INVESTMENT RESTRICTIONS
 
    The following are fundamental investment restrictions of the Fund and may
not be changed without the approval of the holders of a majority of the Fund's
outstanding shares of common stock (which for this purpose and under the 1940
Act means the lesser of (i) 67% of the shares represented at a meeting at which
more than 50% of the outstanding shares of common stock are represented or (ii)
more than 50% of the outstanding shares) and of the outstanding shares of
preferred stock, voting together as a class, and the approval of a majority of
the outstanding shares of preferred stock, voting separately by class. The Fund
may not:
 
        1.  Make investments for the purpose of exercising control or
    management.
 
        2.  Purchase or sell real estate, real estate limited partnerships,
    commodities or commodity contracts; provided that the Fund may invest in
    securities directly or indirectly secured by real estate or interests
    therein or issued by companies that invest in real estate or interests
    therein, and the Fund may purchase and sell financial futures contracts and
    options thereon.
 
        3.  Issue senior securities or borrow money, except as permitted by
    Section 18 of the 1940 Act.
 
        4.  Underwrite securities of other issuers except insofar as the Fund
    may be deemed an underwriter under the Securities Act of 1933, as amended
    (the "1933 Act"), in selling portfolio securities.
 
        5.  Make loans to other persons, except that the Fund may purchase
    Municipal Bonds and other debt securities in accordance with its investment
    objective, policies and limitations.
 
        6.  Invest more than 25% of its total assets (taken at market value at
    the time of each investment) in securities of issuers in a single industry;
    provided that, for purposes of this restriction, states, municipalities and
    their political subdivisions are not considered to be part of any industry.
 
    Additional investment restrictions adopted by the Fund, which may be changed
by the Board of Directors without shareholder approval, provide that the Fund
may not:
 
        a.  Purchase securities of other investment companies, except to the
    extent that such purchases are permitted by applicable law. Applicable law
    currently prohibits the Fund from purchasing the securities of other
    investment companies except if immediately thereafter not more than (i) 3%
    of the total outstanding voting stock of such company is owned by the Fund,
    (ii) 5% of the Fund's total assets, taken at market value, would be invested
    in any one such company, (iii) 10% of the Fund's total assets, taken at
    market value, would be invested in such securities, and (iv) the Fund,
    together with other investment companies having the same investment adviser
    and companies controlled by such companies, owns not more than 10% of the
    total outstanding stock of any one closed-end investment company.
 
                                       28
<PAGE>
        b.  Mortgage, pledge, hypothecate or in any manner transfer, as security
    for indebtedness, any securities owned or held by the Fund except as may be
    necessary in connection with borrowings mentioned in investment restriction
    (3) above or except as may be necessary in connection with transactions in
    financial futures contracts and options thereon.
 
        c.  Purchase any securities on margin, except that the Fund may obtain
    such short-term credit as may be necessary for the clearance of purchases
    and sales of portfolio securities (the deposit or payment by the Fund of
    initial or variation margin in connection with financial futures contracts
    and options thereon is not considered the purchase of a security on margin).
 
        d.  Make short sales of securities or maintain a short position or
    invest in put, call, straddle or spread options, except that the Fund may
    write, purchase and sell options and futures on Municipal Bonds, United
    States Government obligations and related indices or otherwise in connection
    with bona fide hedging activities and may purchase and sell Call Rights to
    require mandatory tender for the purchase of related Municipal Bonds.
 
    If a percentage restriction on the investment or use of assets set forth
above is adhered to at the time a transaction is effected, later changes in
percentages resulting from changing values will not be considered a violation.
 
    The Investment Adviser of the Fund and Merrill Lynch share a common parent,
Merrill Lynch & Co., Inc. ("ML & Co"). Because of the affiliation of Merrill
Lynch with the Investment Adviser, the Fund is prohibited from engaging in
certain transactions involving Merrill Lynch except pursuant to an exemptive
order of the Securities and Exchange Commission or otherwise in compliance with
the provisions of the 1940 Act and the rules and regulations thereunder.
Included among such restricted transactions will be purchases from or sales to
Merrill Lynch of securities in transactions in which Merrill Lynch acts as
principal. An exemptive order has been obtained that permits the Fund to effect
principal transactions with Merrill Lynch in high quality, short-term,
tax-exempt securities subject to conditions set forth in such order. The Fund
does not presently intend to request an order permitting other principal
transactions with Merrill Lynch.
 
                               PURCHASE OF SHARES
 
    The Distributor, an affiliate of both the Investment Adviser and Merrill
Lynch, acts as the distributor of shares of common stock of the Fund. The Fund
is engaged in a continuous offering of its shares of common stock on a best
efforts basis through the Distributor and other selected securities dealers that
have entered into agreements with the Distributor, including Merrill Lynch.
Shares of the Fund may be purchased from the Distributor or selected dealers,
including Merrill Lynch, or by mailing a purchase order directly to the transfer
agent. The minimum initial purchase is $1,000 and the minimum subsequent
purchase is $50. The Fund reserves the right to waive or modify the initial and
subsequent minimum investment requirements at any time. In connection with an
exemption the Fund has obtained from the Commission relating to its tender
offers, the Fund will not offer its shares during the five business days
preceding the termination of a tender offer.
 
                                       29
<PAGE>
    To permit the Fund to invest the net proceeds from the sale of its shares of
common stock in an orderly manner, the Fund may, from time to time, suspend the
sale of its shares of common stock, except for sales to existing holders of
common stock and dividend reinvestments.
 
    Due to the administrative complexities associated with the continuous
offering, administrative errors may result in the Distributor or an affiliate
inadvertently acquiring nominal numbers (in no event in excess of 5% of the
shares of common stock) of shares of common stock that it may wish to resell.
Such shares of common stock will not be subject to any investment restriction
and may be resold pursuant to this Prospectus.
 
    The Fund offers its shares of common stock at a public offering price equal
to the next determined net asset value per share without a front-end sales
charge (although in certain cases a CDSC may apply as described herein). The
applicable offering price for purchase orders is based on the net asset value of
the Fund next determined after receipt of the purchase order by the Distributor.
As to purchase orders received by securities dealers prior to the close of
business on the New York Stock Exchange ("NYSE") (generally, the NYSE closes at
4:00 p.m., Eastern time), which includes orders received after the close of
business on the previous day, the applicable offering price is based on the net
asset value determined as of 15 minutes after the close of business on the NYSE
on that day provided the Distributor in turn receives the order from the
securities dealer prior to 30 minutes after the close of business on the NYSE on
that day. If the purchase orders are not received by the Distributor prior to 30
minutes after the close of business on the NYSE, such orders are deemed received
on the next business day. Any order may be rejected by the Distributor or the
Fund. The Fund or the Distributor may suspend the continuous offering of the
Fund's shares to the general public at any time in response to conditions in the
securities markets or otherwise and may thereafter resume such offering from
time to time. Neither the Distributor nor the dealers are permitted to withhold
placing orders to benefit themselves by a price change. The Distributor is
required to advise the Fund promptly of all purchase orders and cause payments
for shares of common stock to be delivered promptly to the Fund. Merrill Lynch
charges its customers a processing fee (presently $5.35) to confirm a purchase
of shares by such customers. Purchases made directly through Financial Data
Services, Inc. (the "Transfer Agent") are not subject to the processing fee.
 
    The Distributor compensates Merrill Lynch and other selected dealers at a
rate of 3.0% of amounts purchased. In addition, the Distributor compensates
Merrill Lynch and other selected dealers at an annual rate equal to 0.25% of the
value of Fund shares sold by Merrill Lynch and such dealers that remain
outstanding after one year from the date of their original purchase. The
payments made by the Distributor will be made from its own assets and will not
be an expense borne by the Fund, although the Distributor may recover some of
these payments by imposing a contingent deferred sales charge (as described
below) against shareholders who tender shares owned less than three years. See
"Contingent Deferred Sales Charge." Total compensation paid to Merrill Lynch,
other selected dealers and the Distributor, including the compensation paid at
the time of purchase, the 0.25% annual payments mentioned above and the CDSC, if
any, will not exceed the applicable limit (presently 8%), as determined from
time to time by the National Association of Securities Dealers, Inc. For the
period November 3, 1995 (commencement of operations) to October 31, 1996 the
Distributor paid approximately $1,059,723 to Merrill Lynch in connection with
the sale of shares of common stock of the Fund.
 
                                       30
<PAGE>
For the fiscal years ended October 31, 1997 and October 31, 1998, the
Distributor paid approximately $450,585 and $741,805, respectively, to Merrill
Lynch in connection with such sales.
 
    Upon the transfer of shares out of a Merrill Lynch brokerage account, an
investment account in the transferring shareholder's name will be opened
automatically, without charge, at the Fund's Transfer Agent. Shareholders should
be aware that it will not be possible to transfer their shares from Merrill
Lynch to another brokerage firm or financial institution. Shareholders
interested in transferring their brokerage accounts from Merrill Lynch and who
do not wish to have an account maintained for such shares at the transfer agent
must tender the shares for repurchase by the Fund as described under "Tender
Offers" so that the cash proceeds can be transferred to the account at the new
firm.
 
                                 TENDER OFFERS
 
    In recognition of the possibility that a secondary market for the Fund's
shares will not exist, the Fund takes certain actions that provide liquidity to
shareholders. The Fund may from time to time make offers to purchase its shares
of common stock from all beneficial holders of the Fund's common stock at a
price per share equal to the net asset value per share of the common stock
determined at the close of business on the day an offer terminates. Commencing
with the second quarter of the Fund's operations, the Board of Directors has
considered making tender offers on a quarterly basis, and the Board of Directors
intends to continue this practice. There can be no assurance, however, that the
Board of Directors will undertake the making of any tender offer. Subject to the
Fund's investment restriction with respect to borrowings, the Fund may borrow
money to finance the repurchase of shares pursuant to any tender offers.
 
    The Fund expects that ordinarily there will be no secondary market for the
Fund's common stock and that periodic tenders will be the only source of
liquidity for Fund shareholders. Nevertheless, if a secondary market develops
for the common stock of the Fund, the market price of the shares may vary from
net asset value from time to time. Such variance may be affected by, among other
factors, relative demand and supply of shares and the performance of the Fund,
especially as it affects the yield on and net asset value of the common stock of
the Fund. A tender offer for shares of common stock of the Fund at net asset
value is expected to reduce any spread between net asset value and market price
that may otherwise develop. However, there can be no assurance that such action
would result in the Fund's common stock trading at a price that equals or
approximates net asset value.
 
    Although the Board of Directors believes that the tender offers generally
are beneficial to the Fund's holders of common stock, the acquisition of shares
of common stock by the Fund will decrease the total assets of the Fund. Tender
offers are therefore likely to increase the Fund's expense ratio (assuming such
acquisition is not offset by the issuance of additional shares of common stock).
Furthermore, if the Fund borrows to finance the making of tender offers,
interest on such borrowing will reduce the Fund's net investment income.
 
    It is the Board's announced policy, which may be changed by the Board, not
to purchase shares pursuant to a tender offer if (1) such purchases would impair
the Fund's status as a regulated investment company under the Federal tax laws
(which would make the Fund a taxable entity, causing the Fund's income to be
taxed at the corporate level in addition to the taxation of shareholders who
 
                                       31
<PAGE>
receive dividends from the Fund); (2) the Fund would not be able to liquidate
portfolio securities in a manner that is orderly and consistent with the Fund's
investment objective and policies in order to purchase common stock tendered
pursuant to the tender offer; or (3) there is, in the Board's judgment, any (a)
legal action or proceeding instituted or threatened challenging the tender offer
or otherwise materially adversely affecting the Fund, (b) declaration of banking
moratorium by Federal or state authorities or any suspension of payment by banks
in the United States or New York State, that is material to the Fund, (c)
limitation imposed by Federal or state authorities on the extension of credit by
lending institutions, (d) commencement of war, armed hostilities or other
international or national calamity directly or indirectly involving the United
States that is material to the Fund, or (e) other event or condition that would
have a material adverse effect on the Fund or its shareholders if shares of
common stock tendered pursuant to the tender offer were purchased. Thus, there
can be no assurance that the Board will proceed with any tender offer. The Board
of Directors may modify these conditions in light of circumstances existing at
the time. If the Board of Directors determines to purchase the Fund's shares of
common stock pursuant to a tender offer, such purchases could reduce
significantly the asset coverage of any borrowing or outstanding senior
securities, including any preferred stock. The Fund may not purchase shares of
common stock to the extent such purchases would result in the asset coverage
with respect to such borrowing or senior securities, including any preferred
stock, being reduced below the asset coverage requirement set forth in the 1940
Act or, with respect to preferred stock, the asset coverage requirements of any
nationally recognized statistical rating organization rating the preferred
stock. Accordingly, in order to purchase all shares of common stock tendered,
the Fund may have to repay all or part of any then outstanding borrowing or
redeem all or part of any then outstanding senior securities, including any
preferred stock, to maintain the required asset coverage. See "Risks and Special
Considerations of Leverage--Portfolio Management and Other Considerations." In
addition, the amount of shares of common stock for which the Fund makes any
particular tender offer may be limited for the reasons set forth above or in
respect of other concerns related to liquidity of the Fund's portfolio.
 
    In the event that circumstances arise under which the Fund does not conduct
the tender offers regularly, the Board of Directors will consider alternate
means of providing liquidity for holders of common stock. Such action would
include evaluating any secondary market that then exists for the common stock
and determining whether it provides liquidity for holders of common stock. If
the Board of Directors determines that such market, if any, fails to provide
liquidity for the holders of common stock, the Board plans to consider alternate
means of providing liquidity. Among the alternatives that the Board of Directors
may consider is listing the Fund's common stock on a major domestic stock
exchange or on the Nasdaq National Market. The Board of Directors also may
consider causing the Fund to repurchase its shares from time to time in
open-market or private transactions when it can do so on terms that represent a
favorable investment opportunity. In any event, the Board of Directors plans to
cause the Fund to take whatever action it deems necessary or appropriate to
provide liquidity for the holders of common stock in light of the facts and
circumstances existing at such time.
 
    Consummating a tender offer may require the Fund to liquidate portfolio
securities and realize gains or losses at a time when the Investment Adviser
would otherwise consider it disadvantageous to do so.
 
                                       32
<PAGE>
    Each tender offer is made and shareholders notified in accordance with the
requirements of the Securities Exchange Act of 1934 and the 1940 Act, either by
publication or mailing or both. The offering documents contain information
prescribed by such laws and the rules and regulations promulgated thereunder.
The repurchase of tendered shares by the Fund is a taxable event. See "Taxes."
The Fund pays all costs and expenses associated with making of any tender offer.
A CDSC is imposed on most shares accepted for tender that have been held for
less than three years. See "Contingent Deferred Sales Charge." In addition,
Merrill Lynch charges its customers a processing fee (presently $5.35) to
confirm a repurchase of shares from such customers pursuant to a tender offer.
Tenders made directly through the Transfer Agent are not subject to the
processing fee.
 
    Shareholders have an investment option consisting of the right to reinvest
the net proceeds from a sale of shares of the Fund's common stock (the "Original
Shares") in a tender offer by the Fund in Class D shares of certain Merrill
Lynch-sponsored open-end funds ("Eligible Class D Shares") at their net asset
value, without the imposition of an initial sales charge, if the conditions set
forth below are satisfied. First, net proceeds from the sale of the Original
Shares in the tender offer must be immediately reinvested in Eligible Class D
Shares. Second, the investment option is available only with respect to the
proceeds of shares of the Fund's common stock as to which no CDSC is applicable.
Shareholders who already own Class A shares of the fund in which they wish to
invest proceeds from the sale of the Original Shares, in the same account into
which they will purchase the additional shares, may purchase Class A rather than
Class D shares so long as all of the other requirements of this paragraph are
met. Class D shares are subject to an ongoing account maintenance fee at an
annual rate of up to 0.25% of the average daily net asset value of the
applicable fund. Before taking advantage of this investment option, shareholders
should obtain a currently effective prospectus of the fund in which they intend
to invest and should consult their Merrill Lynch Financial Consultant.
Shareholders who utilize this investment option will be treated as if they first
received cash for their tendered shares and then used the proceeds to purchase
the other shares and consequently will realize a taxable gain or loss in the
same manner as if they received cash for their tendered shares. See
"Taxes--Offer to Purchase Shares."
 
                        CONTINGENT DEFERRED SALES CHARGE
 
    A CDSC to recover distribution expenses incurred by the Distributor is
charged against the shareholder's investment account and paid to the Distributor
in connection with most shares of common stock held for less than three years
that are repurchased pursuant to a tender offer. The CDSC is imposed on those
shares of common stock accepted for tender based on an amount equal to the
lesser of the then current net asset value of the shares of common stock or the
cost of the shares of common stock being tendered. Accordingly, the CDSC is not
imposed on increases in the net asset value above the initial purchase price. In
addition, the CDSC is not imposed on shares acquired by reinvesting dividends or
capital gains distributions. In determining whether a CDSC is payable, it is
assumed that the acceptance of an offer to repurchase pursuant to a tender offer
would be made from the earliest purchase of shares of common stock. The CDSC
imposed varies depending on the length of time the
 
                                       33
<PAGE>
common stock has been owned since purchase (separate purchases shall not be
aggregated for these purposes), as set forth in the following table:
 
<TABLE>
<CAPTION>
                                                                              CONTINGENT DEFERRED
YEAR OF REPURCHASE                                                               SALES CHARGE
- --------------------------------------------------------------------------  -----------------------
<S>                                                                         <C>
First.....................................................................               3.0%
Second....................................................................               2.0%
Third.....................................................................               1.0%
Fourth and following......................................................               0.0%
</TABLE>
 
    In determining whether a CDSC is applicable to a tender of shares of common
stock, the calculation is determined in the manner that results in the lowest
possible amount being charged. It is assumed that the shareholder first tenders
shares of common stock held for over three years and shares of common stock
acquired by reinvesting dividends or distributions, followed by shares of common
stock held longest during the three-year period. The CDSC will not be applied to
dollar amounts representing an increase in the net asset value since the time of
purchase. The Fund waives CDSC's on Fund shares tendered following the death of
all beneficial owners of such shares, provided the shares are tendered within
one year of death (a death certificate and other applicable documents may be
required). At the time of tender, the record or succeeding beneficial owner must
notify the transfer agent either directly or indirectly through the Distributor
that the CDSC should be waived. Upon confirmation of the owner's entitlement,
the waiver will be granted; otherwise, the waiver will be lost.
 
EXAMPLE:
 
    Assume an investor purchased 1,000 shares of common stock (at a cost of
$10,000). Two years after purchase, the net asset value per share is $12.00 and,
during the two year period, the investor has acquired 100 additional shares of
common stock by reinvesting dividends. If the investor first tenders 500 shares
at this time (proceeds of $6,000), 100 shares will not be subject to the CDSC
because they were acquired by reinvesting dividends. With respect to the
remaining 400 shares tendered, the CDSC is applied only to the original cost of
$10 per share (and not to the increase in net asset value of $2.00 per share).
Therefore, $4,000 of the $6,000 redemption proceeds will be charged at a rate of
2.0% (the applicable rate in the second year after purchase).
 
    For the period November 3, 1995 (commencement of operations) to October 31,
1996, the amount paid to the Distributor in CDSCs aggregated $38,710. For the
fiscal years ended October 31, 1997 and October 31, 1998, such amount paid to
the Distributor aggregated $85,662 and $146,028, respectively.
 
                             DIRECTORS AND OFFICERS
 
    Information about the Directors, executive officers and portfolio managers
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 Director, executive officer and portfolio manager is P.O. Box 9011,
Princeton, New Jersey 08543-9011.
 
                                       34
<PAGE>
    ARTHUR ZEIKEL (66)--PRESIDENT AND DIRECTOR(1)(2)-- Chairman of the
Investment Adviser and MLAM (which terms, as used herein, include their
corporate predecessors) since 1997; President of the Investment Adviser and MLAM
from 1977 to 1997; Chairman of Princeton Services, Inc. ("Princeton Services)
since 1997, Director since 1993 and President from 1993 to 1997; Executive Vice
President of ML & Co. since 1990.
 
    RONALD W. FORBES (58)--DIRECTOR(2)--1400 Washington Avenue, Albany, New York
12222. Professor of Finance, School of Business, State University of New York at
Albany, since 1989.
 
    CYNTHIA A. MONTGOMERY (46)--DIRECTOR(2)--Harvard Business School, Soldiers
Field Road, Boston, Massachusetts 02163. Professor, Harvard Business School
since 1989; Associate Professor, J.L. Kellogg Graduate School of Management,
Northwestern University from 1985 to 1989; Assistant Professor, Graduate School
of Business Administration, The University of Michigan from 1979 to 1985;
Director, UNUM Corporation since 1990 and Director of Newell Co. since 1995.
 
    CHARLES C. REILLY (67)--DIRECTOR(2) --9 Hampton Harbor Road, Hampton Bays,
New York 11946. Self-employed financial consultant since 1990; President and
Chief Investment Officer of Verus Capital, Inc. from 1979 to 1990; Senior Vice
President of Arnhold and S. Bleichroeder, Inc. from 1973 to 1990; Adjunct
Professor, Columbia University Graduate School of Business from 1990 to 1991;
Adjunct Professor, Wharton School, The University of Pennsylvania from 1989 to
1990.
 
    KEVIN A. RYAN (66)--DIRECTOR(2)--127 Commonwealth Avenue, Chestnut Hill,
Massachusetts 02167. Founder and current Director of The Boston University
Center for the Advancement of Ethics and Character; Professor of Education at
Boston University since 1982; formerly taught on the faculties of The University
of Chicago, Stanford University and Ohio State University.
 
    RICHARD R. WEST (61)--DIRECTOR(2)--Box 604, Genoa, Nevada 89411. Professor
of Finance since 1984, and Dean from 1984 to 1993, and currently Dean Emeritus
of New York University, Leonard N. Stern School of Business Administration;
Director of Bowne & Co., Inc., Vornado Realty Trust, Inc., Vornado Operating
Company and Alexander's Inc.
 
    TERRY K. GLENN (58)--EXECUTIVE VICE PRESIDENT(1)(2)--Executive Vice
President of the Investment Adviser and MLAM since 1983; Executive Vice
President and Director of Princeton Services since 1993; President of Princeton
Funds Distributor, Inc. ("PFD") since 1986 and Director thereof since 1991.
 
    VINCENT R. GIORDANO (54)--SENIOR VICE PRESIDENT(1)(2)--Senior Vice President
of the Investment Adviser and MLAM since 1984; Senior Vice President of
Princeton Services since 1993; Vice President of MLAM from 1980 to 1984.
 
    KENNETH A. JACOB (47)--VICE PRESIDENT(1)(2)--First Vice President of MLAM
since 1997; Vice President of MLAM from 1984 to 1997.
 
    JOHN M. LOFFREDO, CFA (35)--VICE PRESIDENT AND PORTFOLIO
MANAGER(1)(2)--First Vice President of MLAM since 1997; Vice President of MLAM
from 1991 to 1997.
 
    ROBERT A. DIMELLA, CFA (32)--VICE PRESIDENT AND PORTFOLIO
MANAGER(1)(2)--Vice President of MLAM since 1997; Assistant Vice President of
MLAM from 1995 to 1997; employee of MLAM since
 
                                       35
<PAGE>
1993; Assistant Portfolio Manager with Prudential Investment Advisors from 1992
to 1993; Research Associate with Prudential Investment Corporation from 1989 to
1992.
 
    DONALD C. BURKE (38)--VICE PRESIDENT AND TREASURER(1)(2)--Senior Vice
President and Treasurer of the Investment Adviser and MLAM since 1999; Senior
Vice President and Treasurer of Princeton Services; 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.
 
    PATRICK D. SWEENEY (44)--SECRETARY(1)(2)--First Vice President of MLAM since
1997; Vice President of MLAM from 1990 to 1997.
 
- ------------------------
 
(1) Interested person, as defined in the 1940 Act, of the Fund.
 
(2) Such Director or officer is a director, trustee, officer or member of the
    advisory board of one or more investment companies for which the Investment
    Adviser or MLAM acts as investment adviser.
 
    At December 1, 1998, the officers and Directors of the Fund as a group (13
persons) owned an aggregate of less than 1% of the outstanding shares of the
common stock and the Series A AMPS, respectively, and less than 1% of the
outstanding shares of common stock of ML & Co.
 
    In connection with the election of the Fund's Directors, holders of shares
of Series A AMPS and other preferred stock, voting as a separate class, are
entitled to elect two of the Fund's Directors, and the remaining Directors will
be elected by all holders of capital stock, voting as a single class. Messrs.
Forbes and Reilly have been designated as the Directors to be elected by holders
of the preferred stock. See "Description of Capital Stock."
 
COMPENSATION OF DIRECTORS
 
    Pursuant to an Investment Advisory Agreement with the Fund, the Investment
Adviser pays all compensation of officers and employees of the Fund as well as
the fees of all Directors who are affiliated persons of ML & Co. or its
subsidiaries. The Fund pays each Director not affiliated with the Investment
Adviser a fee of $3,000 per year plus $300 per meeting attended and pays all
Director's actual out-of-pocket expenses relating to attendance at meetings. The
Fund also pays members of the Board's Audit and Nominating Committee (the
"Committee"), which consists of all of the non-affiliated Directors an annual
fee of $900. The Chairman of the Committee receives an additional annual fee of
$1,000. For the fiscal year ended October 31, 1998, fees and expenses paid to
the non-affiliated Directors that were allocated to the Fund aggregated $28,715.
 
    The following table sets forth the compensation earned by the non-affiliated
Directors from the Fund for the fiscal year ended October 31, 1998, and the
aggregate compensation paid to non-affiliated
 
                                       36
<PAGE>
Directors from all registered investment companies advised by the Investment
Adviser and its affiliate, MLAM ("FAM/MLAM Advised Funds"), for the calendar
year ended December 31, 1998.
 
<TABLE>
<CAPTION>
                                                                                                   AGGREGATE
                                                                                                 COMPENSATION
                                                                      PENSION OR RETIREMENT      FROM FUND AND
                                                                       BENEFITS ACCRUED AS     FAM/MLAM ADVISED
                                                       COMPENSATION            PART              FUNDS PAID TO
NAME OF DIRECTOR                                         FROM FUND       OF FUND EXPENSE         DIRECTORS(1)
- -----------------------------------------------------  -------------  ----------------------  -------------------
<S>                                                    <C>            <C>                     <C>
Ronald W. Forbes.....................................    $   5,400                None            $   192,567
Cynthia A. Montgomery................................    $   5,400                None            $   192,567
Charles C. Reilly....................................    $   6,400                None            $   362,858
Kevin A. Ryan........................................    $   5,400                None            $   192,567
Richard R. West......................................    $   5,400                None            $   334,125
</TABLE>
 
- ------------------------
 
(1)  The Directors serve on the boards of FAM/MLAM Advised Funds as follows: Mr.
     Forbes (37 registered investment companies consisting of 50 portfolios);
     Ms. Montgomery (37 registered investment companies consisting of 50
     portfolios); Mr. Reilly (56 registered investment companies consisting of
     69 portfolios); Mr. Ryan (37 registered investment companies consisting of
     50 portfolios); and Mr. West (58 registered investment companies consisting
     of 83 portfolios).
 
              INVESTMENT ADVISORY AND ADMINISTRATIVE ARRANGEMENTS
 
    The Investment Adviser, which is owned and controlled by ML & Co., a
financial services holding company and the parent of Merrill Lynch, provides the
Fund with investment advisory and administrative services. The Asset Management
Group of ML & Co. (which includes the Investment Adviser) acts as the investment
adviser to more than 100 registered investment companies and offers portfolio
management services to individuals and institutions. As of December 1998, the
Asset Management Group had a total of approximately $501 billion in investment
company and other portfolio assets under management (including $38.3 billion in
municipal securities). This amount includes assets managed for certain
affiliates of the Investment Adviser. The Investment Adviser is a limited
partnership the partners of which are ML & Co. and Princeton Services. The
principal business address of the Investment Adviser is 800 Scudders Mill Road,
Plainsboro, New Jersey 08536.
 
    The Fund's Investment Advisory Agreement with the Investment Adviser
provides that, subject to the supervision of the Board of Directors of the Fund,
the Investment Adviser is responsible for the actual management of the Fund's
portfolio. The responsibility for making decisions to buy, sell or hold a
particular security rests with the Investment Adviser, subject to review by the
Board of Directors. The Fund's portfolio managers will consider analyses from
various sources, make the necessary investment decisions, and place orders for
transactions accordingly. The Investment Adviser will also be responsible for
the performance of certain management services for the Fund. Robert A. DiMella
and John M. Loffredo are the portfolio managers for the Fund and are primarily
responsible for the Fund's day-to-day management.
 
    For investment advisory services, the Fund pays the Investment Adviser a
monthly fee at an annual rate of 0.50 of 1% of the Fund's average daily net
assets (i.e., the average daily value of the total assets of the Fund, including
proceeds from the issuance of shares of preferred stock, minus the sum of
 
                                       37
<PAGE>
accrued liabilities of the Fund and accumulated dividends on the shares of
preferred stock). For purposes of this calculation, average daily net assets are
determined at the end of each month on the basis of the average net assets of
the Fund for each day during the month.
 
    Under the terms of an Administration Agreement with the Fund, the Investment
Adviser also performs or arranges for the performance of the administrative
services (i.e., services other than investment advice and related portfolio
activities) necessary for the operation of the Fund, including paying all
compensation of and furnishing office space for officers and employees,
performing investment and economic research, trading and investment management
for the Fund, as well as the compensation of all Directors of the Fund who are
affiliated persons of ML & Co. or its subsidiaries.
 
    For administrative services, the Fund pays the Investment Adviser a monthly
fee at an annual rate of 0.25 of 1% of the Fund's average daily net assets
determined in the same manner as the fee payable by the Fund under the
Investment Advisory Agreement. The Investment Adviser may pay a portion of the
fee received pursuant to the Administration Agreement to its affiliate, Merrill
Lynch, for administrative services rendered in connection with any preferred
stock of the Fund. The combined advisory and administration fees are greater
than the advisory fees paid by most funds, but are similar in amount to the fees
paid by other continuously offered, closed-end funds.
 
    For the period November 3, 1995 (commencement of operations) to October 31,
1996, and for the fiscal years ended October 31, 1997 and October 31, 1998, the
fees paid by the Fund to the Investment Adviser pursuant to the Investment
Advisory Agreement were $446,931, $657,929, and $787,978, respectively, and the
fees paid by the Fund pursuant to the Administration Agreement were $223,466,
$328,965, and $393,989, respectively (such fees based on average daily net
assets of approximately $89.9 million, $82.9 million and $110.0 million,
respectively). For the period November 3, 1995 (commencement of operations) to
October 31, 1996, and for the fiscal years ended October 31, 1997 and October
31, 1998, the Investment Adviser voluntarily waived $419,740, $424,822, and
$204,377, respectively, of the fees paid by the Fund pursuant to the Investment
Advisory Agreement and voluntarily reimbursed the Fund additional expenses of
$231,006, $0, and $0, respectively.
 
    The Fund pays all other expenses incurred in its operations, including,
among other things, legal and auditing expenses, taxes, costs of printing
proxies, stock certificates and shareholder reports, charges of the Fund's
custodian and transfer agent, expenses of registering the shares under Federal
and state securities laws, fees and expenses with respect to the issuance of
preferred shares or any borrowing, Securities and Exchange Commission fees, fees
and expenses of non-affiliated Directors, accounting and pricing costs,
insurance, interest, brokerage costs, litigation and other extraordinary or
non-recurring expenses, mailing and other expenses properly payable by the Fund.
Accounting services are provided to the Fund by the Investment Adviser, and the
Fund reimburses the Investment Adviser for its costs in connection with such
services. For the period November 3, 1995 (commencement of operations) to
October 31, 1996, the reimbursement for such services was $60,526. For the
fiscal years ended October 31, 1997 and October 31, 1998, such reimbursement
aggregated $61,452 and $65,847, respectively.
 
    Unless earlier terminated as described below, the Investment Advisory and
Administration Agreements remain in effect from year to year if approved
annually (a) by the Board of Directors of the
 
                                       38
<PAGE>
Fund or by a majority of the outstanding shares of the Fund and (b) by a
majority of the Directors who are not parties to such contracts or interested
persons (as defined in the 1940 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 thereto or by the vote of the shareholders of the
Fund.
 
    Securities held by the Fund may also be held by, or be appropriate
investments for, other funds or investment advisory clients for which the
Investment Adviser or its affiliates act as an adviser. Because of different
objectives or other factors, a particular security may be bought for an advisory
client when other clients are selling the same security. If purchases or sales
of securities by the Investment Adviser for the Fund or other funds for which it
acts as investment adviser or for advisory clients arise for consideration at or
about the same time, transactions in such securities will be made, insofar as
feasible, for the respective funds and clients in a manner deemed equitable to
all. Transactions effected by the Investment Adviser (or its affiliate) on
behalf of more than one of its clients during the same period may increase the
demand for securities being purchased or the supply of securities being sold,
causing an adverse effect on price.
 
CODE OF ETHICS
 
    The Board of Directors of the Fund has adopted a Code of Ethics pursuant to
Rule 17j-1 under the 1940 Act that incorporates the Code of Ethics of the
Investment Adviser (together, the "Codes'). The Codes significantly restrict the
personal investing activities of all employees of the Investment Adviser and, as
described below, impose additional, more onerous, restrictions on fund
investment personnel.
 
    The Codes require that all employees of the Investment Adviser preclear any
personal securities investment (with limited exceptions, such as government
securities). The preclearance 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
Investment Adviser 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 Investment Adviser. 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).
 
                             PORTFOLIO TRANSACTIONS
 
    Subject to policies established by the Board of Directors of the Fund, the
Investment Adviser is primarily responsible for the execution of the Fund's
portfolio transactions. In executing such transactions, the Investment Adviser
seeks to obtain the best results for the Fund, taking into account such factors
as price (including the applicable brokerage commission or dealer spread), size
of order, difficulty of execution and operational facilities of the firm
involved and the firm's risk in positioning a block of securities. While the
Investment Adviser generally seeks reasonably competitive commission rates, the
Fund does not necessarily pay the lowest commission or spread available. For the
period
 
                                       39
<PAGE>
November 3, 1995 (commencement of operations) to October 31, 1996, the Fund did
not pay any brokerage commissions and for the fiscal years ended October 31,
1997 and October 31, 1998, the Fund paid $1,950 and $1,300, respectively, in
such commissions, none of which was paid to Merrill Lynch.
 
    The Fund has no obligation to deal with any broker or dealer in the
execution of transactions in portfolio securities. Subject to providing the best
price and execution, securities firms that provide investment research to the
Investment Adviser, including Merrill Lynch, may receive orders for transactions
by the Fund. Research information provided to the Investment Adviser by
securities firms is supplemental. It does not replace or reduce the level of
services performed by the Investment Adviser and the expenses of the Investment
Adviser will not be reduced because it receives supplemental research
information.
 
    The Fund invests in securities traded in the over-the-counter markets, and
the Fund intends to deal directly with dealers who make markets in the
securities involved, except in those circumstances where better prices and
execution are available elsewhere. Under the 1940 Act, except as permitted by
exemptive order, persons affiliated with the Fund, including Merrill Lynch, are
prohibited from dealing with the Fund as principal in the purchase and sale of
securities. Since transactions in the over-the-counter market usually involve
transactions with dealers acting as principals for their own accounts, the Fund
does not deal with Merrill Lynch and its affiliates in connection with such
transactions except that, pursuant to exemptive orders obtained by the
Investment Adviser, the Fund may engage in principal transactions with Merrill
Lynch in high quality, short-term securities. See "Investment Restrictions." For
the period November 3, 1995 (commencement of operations) to October 31, 1996 and
for the fiscal years ended October 31, 1997 and October 31, 1998, the Fund
engaged in no transactions pursuant to such order. However, affiliated persons
of the Fund, including Merrill Lynch, may serve as its broker in certain
over-the-counter transactions conducted on an agency basis.
 
    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 Directors of the Fund which either comply
with rules adopted by the Commission or with interpretations of the Commission
Staff. Rule 10f-3 under the 1940 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.
 
    The Fund may also make loans to tax-exempt borrowers in individually
negotiated transactions with the borrower. Because an active trading market may
not exist for such securities, the prices that the Fund may pay for these
securities or receive on their resale may be lower than that for similar
securities with a more liquid market.
 
PORTFOLIO TURNOVER
 
    The Fund may dispose of securities without regard to the length of time they
have been held when such action, for defensive or other reasons, appears
advisable to its Investment Adviser. The portfolio
 
                                       40
<PAGE>
turnover rate is calculated by dividing the lesser of purchases or sales of
portfolio securities for the particular fiscal year by the monthly average value
of the portfolio securities owned by the Fund during the year. For purposes of
determining this rate, all securities whose maturities at the time of
acquisition are one year or less are excluded. A high portfolio turnover rate
has certain tax consequences and results in greater transaction costs, which are
borne directly by the Fund. For the fiscal years ended October 31, 1997 and
October 31, 1998 the Fund's portfolio turnover rates were 144% and 142%,
respectively. Portfolio turnover rates tend to be high for funds in their first
few years of operations. The Fund purchases temporary holdings until more,
appropriate, long-term investments are acquired. This strategy continues until
the Fund "matures" into a portfolio of core holdings enabling it to meet its
investment objectives.
 
                          DIVIDENDS AND DISTRIBUTIONS
 
    The Fund intends to distribute substantially all of its net investment
income. Dividends from such net investment income are paid monthly. As long as
any preferred stock is outstanding, monthly distributions to holders of common
stock normally will consist of substantially all net investment income remaining
after the payment of dividends (and any Additional Distribution) on the Series A
AMPS and any other preferred stock. All net realized capital gains, if any, will
be distributed at least annually to holders of common stock and pro rata to
holders of common stock and preferred stock. While any shares of preferred stock
are outstanding, the Fund may not declare any cash dividend or other
distribution on its common stock, unless at the time of such declaration (1) all
accumulated preferred stock dividends, including any Additional Distribution,
have been paid, and (2) the net asset value of the Fund's portfolio (determined
after deducting the amount of such dividend or other distribution) is at least
200% of the liquidation value of the outstanding preferred stock (expected to
equal the original purchase price of the outstanding shares of preferred stock
plus any accumulated and unpaid dividends thereon and any accumulated but unpaid
Additional Distribution). As of the date of this Prospectus, Series A AMPS
represent approximately 33% of the Fund's capital and the asset coverage with
respect to the Series A AMPS is approximately 300%. If the Fund's ability to
make distributions on its common stock is limited, such limitation could under
certain circumstances impair the ability of the Fund to maintain its
qualification for taxation as a regulated investment company, which would have
adverse tax consequences for holders of common stock. See "Taxes."
 
    All net realized capital gains, if any, will be distributed to the Fund's
shareholders at least annually. See "Automatic Dividend Reinvestment Plan" for
information concerning the manner in which dividends and distributions to
holders of common stock may be automatically reinvested in shares of common
stock of the Fund. Dividends and distributions are taxable to shareholders as
discussed below whether they are reinvested in shares of the Fund or received in
cash. The Fund is not responsible for any failure of delivery to the
shareholder's address of record and no interest will accrue on amounts
represented by uncashed distribution or redemption checks.
 
                                       41
<PAGE>
                                     TAXES
 
GENERAL
 
    The Fund intends to continue to qualify for the special tax treatment
afforded regulated investment companies ("RICs") under the Internal Revenue Code
of 1986, as amended (the "Code"). As long as it so qualifies, in any taxable
year in which it distributes at least 90% of its taxable net income and 90% of
its tax-exempt net income (see below), the Fund (but not its shareholders) will
not be subject to Federal income tax to the extent that it distributes its net
investment income and net realized capital gains. The Fund intends to distribute
substantially all of such income.
 
    The Code requires a RIC to pay a nondeductible 4% excise tax to the extent
the RIC does not distribute, during each calendar year, 98% of its ordinary
income, determined on a calendar year basis, and 98% of its capital gains,
determined, in general, on an October 31 year-end, plus certain undistributed
amounts from previous years. The required distributions, however, are based only
on the taxable income of a RIC. The excise tax, therefore, generally will not
apply to the tax-exempt income of a RIC, such as the Fund, that pays
exempt-interest dividends.
 
    The Fund intends to qualify to pay "exempt-interest" dividends as defined in
Section 852(b)(5) of the Code. Under such section if, at the close of each
quarter of its taxable year, at least 50% of the value of its total assets
consists of obligations exempt from Federal income tax ("tax-exempt
obligations") under Section 103(a) of the Code (relating generally to
obligations of a state or local governmental unit), the Fund will be qualified
to pay exempt-interest dividends to its shareholders. Exempt-interest dividends
are dividends or any part thereof paid by the Fund which are attributable to
interest on tax-exempt obligations and designated by the Fund as exempt-interest
dividends in a written notice mailed to the Fund's shareholders within 60 days
after the close of its taxable year. To the extent that the dividends
distributed to the Fund's shareholders are derived from interest income exempt
from tax under Code Section 103(a) and are properly designated as
exempt-interest dividends, they will be excludable from a shareholder's gross
income for Federal income tax purposes. Exempt-interest dividends are included,
however, in determining the portion, if any, of a person's social security and
railroad retirement benefits subject to Federal income taxes. Interest on
indebtedness incurred or continued to purchase or carry Fund shares will not be
deductible by the investor for Federal income tax purposes, to the extent
attributable to exempt-interest dividends. Shareholders are advised to consult
their tax advisers with respect to whether exempt-interest dividends retain the
exclusion under Code Section 103(a) if such shareholder would be treated as a
"substantial user" or "related person" under Code Section 147(a) with respect to
property financed with the proceeds of an issue of "industrial development
bonds" or "private activity bonds," if any, held by the Fund.
 
    To the extent that the Fund's distributions are derived from interest on its
taxable investments or from an excess of net short-term capital gains over net
long-term capital losses ("ordinary income dividends"), such distributions are
considered ordinary income for Federal income tax purposes. Distributions, if
any, from an excess of net long-term capital gains over net short-term capital
losses derived from the sale of securities or from certain transactions in
futures or options ("capital gain dividends") are taxable as long-term capital
gains for Federal income tax purposes, regardless of the length of time the
shareholder has owned Fund shares. Certain categories of capital gains are
taxable at different
 
                                       42
<PAGE>
rates. Generally not later than 60 days after the close of its taxable year, the
Fund will provide its shareholders with a written notice designating the amounts
of any exempt-interest dividends and capital gain dividends, as well as any
amount of capital gain dividends in the different categories of capital gain
referred to above. Distributions by the Fund, whether from exempt-interest
income, ordinary income or capital gains, are not eligible for the dividends
received deduction allowed to corporations under the Code.
 
    All or a portion of the Fund's gain from the sale or redemption of
tax-exempt obligations purchased at a market discount will be treated as
ordinary income rather than capital gain. This rule may increase the amount of
ordinary income dividends received by shareholders. Distributions in excess of
the Fund's earnings and profits will first reduce the adjusted tax basis of a
holder's shares and, after such adjusted tax basis is reduced to zero, will
constitute capital gains to such holder (assuming the shares are held as a
capital asset). Any loss upon the sale or exchange of shares held for six months
or less will be disallowed to the extent of any exempt-interest dividends
received by the shareholder. In addition, any such loss that is not disallowed
under the rule stated above will be treated as long-term capital loss to the
extent of any capital gain dividends received by the shareholder. If the Fund
pays a dividend in January which was declared in the previous October, November
or December to shareholders of record on a specified date in one of such months,
then such dividend will be treated for tax purposes as being paid by the RIC and
received by its shareholders on December 31 of the year in which such dividend
was declared.
 
    The Internal Revenue Service ("IRS") has taken the position in a revenue
ruling that if a RIC has two or more classes of shares, it may designate
distributions made to each class in any year as consisting of no more than such
class's proportionate share of particular types of income, including exempt-
interest income and net long-term capital gains. A class's proportionate share
of a particular type of income is determined according to the percentage of
total dividends paid by the RIC during such year that was paid to such class.
Consequently, the Fund intends to designate distributions made to the common
stock, the Series A AMPS and any other preferred stock issued by the Fund, as
consisting of particular types of income in accordance with the classes'
proportionate shares of such income. Thus, the Fund will designate dividends
paid as exempt-interest dividends in a manner that allocates such dividends
between the holders of common stock and Series A AMPS in proportion to the total
dividends paid to each class during the taxable year, or otherwise as required
by applicable law. Capital gain dividends will similarly be allocated among the
classes in proportion to the total dividends paid to each class during the
taxable year, or otherwise as required by applicable law. When capital gain or
other taxable income is allocated to holders of Series A AMPS pursuant to the
allocation rules described above, the terms of the Series A AMPS require the
Fund to make an additional distribution to or otherwise compensate such holders
for the tax liability resulting from such allocation.
 
    In the opinion of Brown & Wood LLP, counsel to the Fund, under current law
the manner in which the Fund allocates items of tax-exempt income, net capital
gains, and other taxable income, if any, between shares of common stock and
shares of Series A AMPS will be respected for Federal income tax purposes.
However, there currently is no direct guidance from the IRS or other sources
specifically addressing whether the Fund's method for allocating tax-exempt
income, net capital gains, and other taxable income between shares of common
stock and shares of Series A AMPS will be
 
                                       43
<PAGE>
respected for Federal income tax purposes, and it is possible that the IRS could
disagree with counsel's opinion and attempt to reallocate the Fund's net capital
gains or other taxable income. A reallocation may cause the Fund to be liable
for income tax and excise tax on any reallocated taxable income. Brown & Wood
LLP has advised the Fund that, in its opinion, if the IRS were to challenge in
court the Fund's allocations of income and gain, the IRS would be unlikely to
prevail. The opinion of Brown & Wood LLP, however, represents only its best
legal judgment and is not binding on the IRS or the courts.
 
    The Code subjects interest received on certain otherwise tax-exempt
securities to an alternative minimum tax. This alternative minimum tax applies
to interest received on "private activity bonds" issued after August 7, 1986.
Private activity bonds are bonds that, although tax-exempt, are used for
purposes other than those generally performed by governmental units and that
benefit non-governmental entities (e.g., bonds used for industrial development
or housing purposes). Income received on such bonds is classified as an item of
"tax preference" which could subject investors in such bonds, including
shareholders of the Fund, to an alternative minimum tax. The Fund intends to
purchase such "private activity bonds" and will report to shareholders within 60
days after its calendar year-end the portion of its dividends declared during
the year which constitutes an item of tax preference for alternative minimum tax
purposes. The Code further provides that corporations are subject to an
alternative minimum tax based, in part, on certain differences between taxable
income as adjusted for other tax preferences and the corporation's "adjusted
current earnings," which more closely reflect a corporation's economic income.
Because an exempt-interest dividend paid by the Fund will be included in
adjusted current earnings, a corporate shareholder may be required to pay an
alternative minimum tax on exempt-interest dividends paid by the Fund.
 
    The Fund may invest in high yield securities, as described herein.
Furthermore, the Fund may also invest in instruments the return on which
includes nontraditional features such as indexed principal or interest payments
("nontraditional instruments"). These instruments may be subject to special tax
rules under which the Fund may be required to accrue and distribute income
before amounts due under the obligations are paid. In addition, it is possible
that all or a portion of the interest payments on such high yield securities
and/or nontraditional instruments could be recharacterized as taxable ordinary
income.
 
    If at any time when Series A AMPS or other shares of preferred stock are
outstanding the Fund does not meet the asset coverage requirements of the 1940
Act, the Fund will be required to suspend distributions to holders of common
stock until the asset coverage is restored. See "Dividends and Distributions."
This may prevent the Fund from distributing at least 90% of its net investment
income and may, therefore, jeopardize the Fund's qualification for taxation as a
RIC. Upon any failure to meet the asset coverage requirements of the 1940 Act,
the Fund, in its sole discretion, may, and under certain circumstances will be
required to, redeem shares of preferred stock in order to maintain or restore
the requisite asset coverage and avoid the adverse consequences to the Fund and
its shareholders of failing to qualify as a RIC. There can be no assurance,
however, that any such action would achieve such objectives.
 
    As noted above, the Fund must distribute annually at least 90% of its net
taxable and tax-exempt interest income. A distribution will only be counted for
this purpose if it qualifies for the dividends
 
                                       44
<PAGE>
paid deduction under the Code. Some types of preferred stock that the Fund
currently contemplates issuing in addition to the Series A AMPS may raise an
issue as to whether distributions on such preferred stock are "preferential"
under the Code and therefore not eligible for the dividends paid deduction. The
Fund intends to issue preferred stock that counsel advises will not result in
the payment of a preferential dividend and may seek a private letter ruling from
the Internal Revenue Service to that effect. If the Fund ultimately relies
solely on a legal opinion when it issues such preferred stock, there is no
assurance that the Internal Revenue Service would agree that dividends on the
preferred stock are not preferential. If the Internal Revenue Service
successfully disallowed the dividends paid deduction for dividends on the
preferred stock, the Fund could be disqualified as a RIC. In this case,
dividends paid by the Fund would not be exempt from Federal income taxes.
Additionally, the Fund would be subject to the alternative minimum tax.
 
    The value of common shares acquired pursuant to the Fund's dividend
reinvestment plan will generally be excluded from gross income to the extent
that the cash amount reinvested would be excluded from gross income. If, when
the Fund's shares are trading at a premium over net asset value, the Fund issues
shares pursuant to the dividend reinvestment plan that have a greater fair
market value than the amount of cash reinvested, it is possible that all or a
portion of such discount (which may not exceed 5% of the fair market value of
the Fund's shares) could be viewed as a taxable distribution. If the discount is
viewed as a taxable distribution, it is also possible that the taxable character
of this discount would be allocable to all the shareholders, including
shareholders who do not participate in the dividend reinvestment plan. Thus,
shareholders who do not participate in the dividend reinvestment plan, as well
as plan participants, might be required to report as ordinary income a portion
of their distributions equal to their allocable share of the discount.
 
    Ordinary income dividends paid to shareholders who are nonresident aliens or
foreign entities will be subject to a 30% United States withholding tax under
existing provisions of the Code applicable to foreign individuals and entities
unless a reduced rate of withholding or a withholding exemption is provided
under applicable treaty law. Nonresident shareholders are urged to consult their
own tax advisers concerning the applicability of the United States withholding
tax.
 
    Under certain Code provisions, some taxpayers may be subject to a 31%
withholding tax on certain ordinary income dividends and on capital gain
dividends and redemption payments ("backup withholding"). Generally,
shareholders subject to backup withholding are those for whom no certified
taxpayer identification number is on file with the Fund or who, to the Fund's
knowledge, have furnished an incorrect number. When establishing an account, an
investor must certify under penalty of perjury that such number is correct and
that such investor is not otherwise subject to backup withholding.
 
    The Code provides that every person required to file a tax return must
include for information purposes on such return the amount of exempt-interest
dividends received from all sources (including the Fund) during the taxable
year.
 
TENDER OFFERS
 
    Under current law, a holder of common stock, who, pursuant to any tender
offer, tenders all of its shares and who, after such tender offer, is not
considered to own any shares under attribution
 
                                       45
<PAGE>
rules contained in the Code will realize a taxable gain or loss depending upon
such shareholder's basis in the shares. Such gain or loss will be treated as
capital gain or loss if the shares are held as capital assets and will be
long-term if the shares have been held for more than one year. Different tax
consequences may apply to tendering and non-tendering holders of common stock in
connection with a tender offer, and these consequences will be disclosed in the
related offering documents. For example, if a tendering holder of common stock
tenders less than all shares owned by or attributed to such shareholder, and if
the distribution to such shareholder does not otherwise qualify as a sale or
exchange, the proceeds received will be treated as a taxable dividend, or, if
the Fund has insufficient earnings and profits, a return of capital or capital
gain, depending on the shareholder's basis in the tendered shares. Also, there
is a remote risk that non-tendering holders of common stock may be considered to
have received a deemed distribution that may be a taxable dividend in whole or
in part. Holders of common stock may wish to consult their tax advisers prior to
tendering. Likewise, if holders of common stock whose shares are acquired by the
Fund in the open market sell less than all shares owned by or attributed to
them, a risk exists that these shareholders will be subject to taxable dividend
treatment, and a remote risk exists that the remaining shareholders may be
considered to have received a deemed distribution.
 
TAX TREATMENT OF OPTIONS AND FUTURES TRANSACTIONS
 
    The Fund may purchase or sell municipal bond index futures contracts and
interest rate futures contracts on U.S. Government securities ("financial
futures contracts"). The Fund may also purchase and write call and put options
on such financial futures contracts. In general, unless an election is available
to the Fund or an exception applies, such options and financial futures
contracts that are "Section 1256 contracts" will be "marked to market" for
Federal income tax purposes at the end of each taxable year, i.e., each such
option or financial futures contract will be treated as sold for its fair market
value on the last day of the taxable year, and any gain or loss attributable to
Section 1256 contracts will be 60% long-term and 40% short-term capital gain or
loss. Application of the mark-to-market rules to Section 1256 contracts held by
the Fund may alter the timing and character of distributions to shareholders.
The mark-to-market rules outlined above, however, will not apply to certain
transactions entered into by the Fund solely to reduce the risk of changes in
price or interest rates with respect to its investments.
 
    Code Section 1092, which applies to certain "straddles," may affect the
taxation of the Fund's sales of securities and transactions in financial futures
contracts and related options. Under Section 1092, the Fund may be required to
postpone recognition for tax purposes of losses incurred in certain sales of
securities and certain closing transactions in financial futures contracts or
the related options.
 
STATE AND LOCAL TAXES
 
    The exemption from Federal income tax for exempt-interest dividends does not
necessarily result in an exemption for such dividends under the income or other
tax laws of any state or local taxing authority. Shareholders are advised to
consult their own tax advisers concerning state and local tax matters.
 
                                       46
<PAGE>
                            ------------------------
 
    The foregoing is a general and abbreviated summary of the applicable
provisions of the Code and Treasury regulations presently in effect. For the
complete provisions, reference should be made to the pertinent Code sections and
the Treasury regulations promulgated thereunder. The Code and the Treasury
regulations are subject to change by legislative, judicial or administrative
action either prospectively or retroactively.
 
    Shareholders are urged to consult their tax advisers regarding the
availability of any exemptions from state or local taxes and with specific
questions as to Federal, foreign, state, or local taxes.
 
                      AUTOMATIC DIVIDEND REINVESTMENT PLAN
 
    All dividends and capital gains distributions on the common stock of the
Fund are reinvested automatically in full and fractional shares of common stock
of the Fund at the net asset value per share next determined on the payable date
of such dividend or distribution. A shareholder may at any time, by written
notification to Merrill Lynch if the shareholder's account is maintained with
Merrill Lynch or by written notification or by telephone (1-800-MER-FUND) to the
transfer agent, if the shareholder's account is maintained with the transfer
agent, elect to have subsequent dividends or both dividends and capital gains
distributions paid in cash, rather than reinvested, in which event payment will
be mailed on or about the payment date (provided that, in the event that a
payment on an account maintained at the transfer agent would amount to $10 or
less, a shareholder will not receive such payment in cash and such payment will
be automatically reinvested in additional shares). Cash payments can also be
directly deposited to the shareholder's bank account. No CDSC will be imposed on
redemptions of shares issued as a result of the automatic reinvestment of
dividends or capital gains distributions. The Fund is not responsible for any
failure of delivery to the shareholder's address of record and no interest will
accrue on amounts represented by uncashed distribution or redemption checks.
 
    The automatic reinvestment of dividends does not relieve participants of any
Federal income tax that may be payable (or required to be withheld) on such
dividends or distributions. See "Taxes."
 
                                NET ASSET VALUE
 
    The net asset value per share of common stock is determined once daily as of
15 minutes after the close of business on the NYSE (generally, the NYSE closes
at 4:00 p.m., Eastern time), on each business day during which the NYSE is open
for trading. The NYSE is not open 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. For purposes of determining the net asset
value of a share of common stock, the value of the securities held by the Fund
plus any cash or other assets (including interest accrued but not yet received)
minus all liabilities (including accrued expenses) and the aggregate liquidation
value of the outstanding shares of preferred stock is divided by the total
number of shares of common stock outstanding at such time. Expenses, including
the fees payable to the Investment Adviser, are accrued daily.
 
    The municipal bonds in which the Fund invests are traded primarily in the
over-the-counter markets. In determining net asset value, the Fund utilizes the
valuations of portfolio securities furnished by
 
                                       47
<PAGE>
a pricing service approved by the Board of Directors. The pricing service
typically values portfolio securities at the bid price or the yield equivalent
when quotations are readily available. Market illiquidity may make it difficult
for the Fund to obtain accurate quotations for its holdings of high-yield
Municipal Bonds. Municipal Bonds for which quotations are not readily available
are valued at fair market value on a consistent basis as determined by the
pricing service using a matrix system to determine valuations. The procedures of
the pricing service and its valuations are reviewed by the officers of the Fund
under the general supervision of the Board of Directors. The Board of Directors
has determined in good faith that the use of a pricing service is a fair method
of determining the valuation of portfolio securities. Obligations with remaining
maturities of 60 days or less are valued at amortized cost, unless this method
no longer produces fair valuations. Positions in futures contracts are valued at
closing prices for such contracts established by the exchange on which they are
traded, or if market quotations are not readily available, are valued at fair
value on a consistent basis using methods determined in good faith by the Board
of Directors.
 
                          DESCRIPTION OF CAPITAL STOCK
 
    The Fund is authorized to issue 200,000,000 shares of capital stock, par
value $.10 per share, all of which shares were initially classified as common
stock. The Board of Directors is authorized, however, to classify or reclassify
any unissued shares of capital stock by setting or changing in any one or more
respects the designation and number of shares of any such class or series, and
the nature, rates, amounts and times at which and the conditions under which
dividends shall be payable on and the voting, conversion, redemption and
liquidation rights of such class or series and any other preferences, rights,
restrictions, and qualifications applicable thereto. In this regard, the Board
of Directors reclassified 40,000 shares of unissued common stock as Auction
Market Preferred Stock, par value $0.10 per share, liquidation preference
$25,000 per share ("AMPS").
 
    The following table shows the amount of (i) capital stock authorized, (ii)
capital stock held by the Fund for its own account and (iii) capital stock
outstanding for each class of authorized securities of the Fund as of October
31, 1998.
 
<TABLE>
<CAPTION>
                                                                                                 AMOUNT OUTSTANDING
                                                                                               AS OF OCTOBER 31, 1998
                                                                               AMOUNT HELD      (EXCLUSIVE OF AMOUNT
                                                                                   BY                   HELD
                                                                AMOUNT        FUND FOR ITS         BY FUND FOR ITS
TITLE OF CLASS                                                AUTHORIZED       OWN ACCOUNT          OWN ACCOUNT)
- -----------------------------------------------------------  -------------  -----------------  -----------------------
<S>                                                          <C>            <C>                <C>
Common Stock...............................................    199,960,000            -0-              10,523,555
Auction Market Preferred Stock.............................         40,000            -0-                   1,920
</TABLE>
 
COMMON STOCK
 
    Shares of common stock, when issued and fully outstanding, are fully paid
and non-assessable. Shareholders are entitled to share pro rata in the net
assets of the Fund available for distribution to holders of common stock upon
liquidation of the Fund. Shareholders are entitled to one vote for each share
held.
 
                                       48
<PAGE>
    So long as any shares of the Fund's preferred stock are outstanding, holders
of common stock will not be entitled to receive any net income of or other
distributions from the Fund unless all accumulated dividends on preferred stock
have been paid and unless asset coverage (as defined in the 1940 Act) with
respect to preferred stock would be at least 200% after giving effect to such
distributions. See "Preferred Stock" below.
 
    The Fund sends unaudited reports at least semi-annually and audited annual
financial statements to all of its shareholders.
 
PREFERRED STOCK
 
    The Fund's shares of preferred stock may be issued in one or more series,
with rights as determined by the Board of Directors, by action of the Board of
Directors without the approval of the holders of common stock. Under the Fund's
Articles Supplementary specifying the powers, preferences and rights of the
AMPS, the Fund is authorized to issue an aggregate of 40,000 shares of AMPS,
designated respectively: 8,000 shares of Series A AMPS, 8,000 shares of Series B
AMPS, 8,000 shares of Series C AMPS, 8,000 shares of Series D AMPS and 8,000
shares of Series E AMPS. The Series A AMPS are the only series currently offered
and to be issued and outstanding. Under the 1940 Act, the Fund is permitted to
have outstanding more than one series of preferred stock so long as no single
series has a priority over another series as to the distributions of assets of
the Fund or the payment of dividends. Holders of common stock have no preemptive
right to purchase any shares of preferred stock that might be issued. It is
anticipated that the net asset value per share of the preferred stock will equal
its original purchase price per share plus accumulated dividends per share.
 
    As of the date of this Prospectus, the Fund has issued 2,320 shares of
Series A AMPS and may offer additional shares of AMPS and other preferred stock
(representing up to approximately 35% of the Fund's capital), subject to market
conditions and to the Board's continuing to believe that leveraging the Fund's
capital structure through the issuance of preferred stock is likely to achieve
the benefits to the holders of common stock described in the Prospectus. The
terms of such preferred stock, including its dividend rate, voting rights,
liquidation preference and redemption provisions will be determined by the Board
of Directors (subject to applicable law and the Fund's Articles of
Incorporation). The redetermination of the dividend rate will be made at
relatively short intervals (generally seven or 28 days), or a medium-term
dividend rate, in which case periodic redetermination of the dividend rate will
be made at intervals of up to five years. In either case, such redetermination
of the dividend rate will be made through an auction or remarketing procedure.
Additionally, under certain circumstances, when the Fund is required to allocate
taxable income to holders of the preferred stock, it is anticipated that the
terms of the preferred stock will require the Fund to make an Additional
Distribution (as defined in "Risks and Special Considerations of
Leverage--Effects of Leverage") to such holders. The Board also has indicated
that it is likely that the liquidation preference, voting rights and redemption
provisions of the preferred stock will be as stated below. The Fund's Articles
of Incorporation, as amended, together with any Articles Supplementary, are
referred to below as the "Charter."
 
                                       49
<PAGE>
    LIQUIDATION PREFERENCE.  In the event of any voluntary or involuntary
liquidation, dissolution or winding up of the Fund, the holders of shares of
preferred stock will be entitled to receive a preferential liquidating
distribution (expected to equal the original purchase price per share plus an
amount equal to accumulated and unpaid dividends whether or not earned or
declared and any accumulated and unpaid Additional Distribution) before any
distribution of assets is made to holders of common stock. After payment of the
full amount of the liquidating distribution to which they are entitled, the
preferred stockholders will not be entitled to any further participation in any
distribution of assets by the Fund. A consolidation or merger of the Fund with
or into any other corporation or corporations or a sale of all or substantially
all of the assets of the Fund will not be deemed to be a liquidation,
dissolution or winding up of the Fund.
 
    VOTING RIGHTS.  Except as otherwise indicated in this Prospectus and except
as otherwise required by applicable law, holders of shares of preferred stock
will have equal voting rights with holders of shares of common stock (one vote
per share) and will vote together with holders of common stock as a single
class.
 
    In connection with the election of the Fund's directors, holders of shares
of Series A AMPS and other preferred stock, voting as a separate class, are
entitled to elect two of the Fund's directors, and the remaining directors will
be elected by all holders of capital stock, voting as a single class. So long as
any preferred stock is outstanding, the Fund will have not less than five
directors. If at any time dividends on shares of the Fund's preferred stock
shall be unpaid in an amount equal to two full years' dividends thereon, the
holders of all outstanding shares of preferred stock, voting as a separate
class, will be entitled to elect a majority of the Fund's directors until all
dividends in default have been paid or declared and set apart for payment.
 
    The affirmative vote of the holders of a majority of the outstanding shares
of the preferred stock, voting as a separate class, will be required to (i)
authorize, create or issue (other than the preferred stock authorized by the
Articles Supplementary creating such preferred stock), or increase the
authorized or issued aggregate stated capital amount of (other than the
preferred stock authorized by the Articles Supplementary creating such preferred
stock), any class or series of stock ranking prior to or on a parity with any
series of preferred stock with respect to payment of dividends or the
distribution of assets on liquidation, or increase the authorized amount of
preferred stock or (ii) amend, alter or repeal the provisions of the Charter,
whether by merger, consolidation or otherwise, so as to adversely affect any of
the contract rights expressly set forth in the Charter of holders of preferred
stock.
 
    REDEMPTION PROVISIONS.  Shares of preferred stock generally will be
redeemable at the option of the Fund at a price equal to their liquidation
preference plus accumulated but unpaid dividends to the date of redemption plus,
under certain circumstances, a redemption premium. Shares of preferred stock
will also be subject to mandatory redemption at a price equal to their
liquidation preference plus accumulated but unpaid dividends to the date of
redemption upon the occurrence of certain specified events, such as the failure
of the Fund to maintain asset coverage requirements for the preferred stock
specified by the rating agencies that issue ratings on the preferred stock. The
Charter prohibits the sale or transfer of preferred stock to any affiliate of
the Fund or the Investment Adviser, except for an affiliate that may be acting
as a broker-dealer in connection with the preferred stock.
 
                                       50
<PAGE>
CERTAIN PROVISIONS OF THE ARTICLES OF INCORPORATION
 
    The Fund's Articles of Incorporation include provisions that could have the
effect of limiting the ability of other entities or persons to acquire control
of the Fund or to change the composition of its Board of Directors and could
have the effect of depriving shareholders of an opportunity to sell their shares
at a premium over prevailing market prices by discouraging a third party from
seeking to obtain control of the Fund. A Director may be removed from office
with or without cause by vote of the holders of at least 66 2/3% of the shares
of capital stock entitled to be voted on the matter. A director elected by all
of the holders of capital stock may be removed only by action of such holders,
and a director elected by the holders of preferred stock may be removed only by
action of such holders.
 
    In addition, the Articles of Incorporation require the favorable vote of the
holders of at least 66 2/3% of the Fund's shares of capital stock, then entitled
to be voted, voting as a single class, to approve, adopt or authorize the
following:
 
       - a merger or consolidation or statutory share exchange of the Fund with
         other corporations,
 
       - a sale of all or substantially all of the Fund's assets (other than in
         the regular course of the Fund's investment activities), or
 
       - a liquidation or dissolution of the Fund,
 
unless such action has been approved, adopted or authorized by the affirmative
vote of two-thirds of the total number of Directors fixed in accordance with the
by-laws, in which case the affirmative vote of a majority of the Fund's shares
of capital stock is required. The approval, adoption or authorization of the
foregoing would also require the favorable vote of at least a majority of the
Fund's shares of preferred stock then entitled to be voted, voting as a separate
class.
 
    In addition, conversion of the Fund to an open-end investment company would
require an amendment to the Fund's Articles of Incorporation. The amendment
would have to be declared advisable by the Board of Directors prior to its
submission to shareholders. Such an amendment would require the favorable vote
of the holders of at least 66 2/3% of the Fund's outstanding shares of capital
stock (including the preferred stock) entitled to be voted on the matter, voting
as a single class (or a majority of such shares if the amendment was previously
approved, adopted or authorized by at least two-thirds of the total number of
Directors fixed in accordance with the by-laws), and, while shares of preferred
stock are outstanding, the affirmative vote of at least a majority of
outstanding shares of preferred stock of the Fund, voting as a separate class.
Such a vote also would satisfy a separate requirement in the 1940 Act that the
change be approved by the shareholders. Shareholders of an open-end investment
company may require the company to redeem their shares of common stock at any
time (except in certain circumstances as authorized by or under the 1940 Act) at
their net asset value, less such redemption charge, if any, as might be in
effect at the time of a redemption. All redemptions will be made in cash. If the
Fund is converted to an open-end investment company, it could be required to
liquidate portfolio securities to meet requests for redemption. Conversion to an
open-end investment company would also require redemption of all outstanding
shares of preferred stock and would require changes in certain of the Fund's
investment policies and restrictions, such as those relating to the issuance of
senior securities and the borrowing of money.
 
                                       51
<PAGE>
    The Board of Directors has determined that the 66 2/3% voting requirements
described above, which are greater than the minimum requirements under Maryland
law or the 1940 Act, are in the best interests of shareholders generally.
Reference should be made to the Article of Incorporation on file with the
Securities and Exchange Commission for the full text of these provisions.
 
                                PERFORMANCE DATA
 
    From time to time, the Fund may include its yield, tax equivalent yield
and/or total return on its common stock for various specified time periods in
advertisements or information furnished to present or prospective shareholders.
 
    The yield of the Fund refers to the income generated by an investment in the
Fund over a stated period. Yield is calculated by annualizing the distribution
over a stated period and dividing the product by the average per share net
value. For the fiscal year ended October 31, 1998, the Fund earned $0.596 per
share income dividends, representing a net annualized yield of 5.46%, based on a
month-end per share net asset value of common stock of $10.96. Tax equivalent
yield quotations will be computed by dividing (a) the part of the Fund's yield
that is tax-exempt by (b) one minus a stated tax rate and (c) adding the result
to that part, if any, of the Fund's yield that is not tax-exempt. The
tax-equivalent yield for the fiscal year ended October 31, 1998 (based on a
Federal income tax rate of 28%) was 7.58%. See Appendix II to this Prospectus
for more information regarding tax equivalent yields.
 
    The Fund also may quote annual total return and aggregate total return
performance data. Total return quotations for the specified periods will be
computed by finding the rate of return (based on net investment income and any
capital gains or losses on portfolio investments over such periods) that would
equate the initial amount invested to the value of such investment at the end of
the period. For the fiscal year ended October 31, 1998, the annual total return
of the Fund was 8.28%, based on the change in per share net asset value of
common stock from $10.87 to $10.96, and assuming reinvestment of $0.733 per
share income dividends and $0.047 per share capital gains distributions.
 
    The calculation of yield, tax-equivalent yield and total return does not
reflect the imposition of any CDSC or the amount of any shareholder's tax
liability.
 
    Yield, tax-equivalent yield and total return figures are based on the Fund's
historical performance and are not intended to indicate future performance. The
Fund's yield is expected to fluctuate, and its total return varies depending on
market conditions, the Municipal Bonds and other securities comprising the
Fund's portfolio, the Fund's operating expenses and the amount of net realized
and unrealized capital gains or losses during the period.
 
    On occasion, the Fund may compare its yield and tax-equivalent yield to
yield data published by Lipper Analytical Services, Inc. or performance data
published by Morningstar Publications, Inc., MONEY MAGAZINE, U.S. NEWS & WORLD
REPORT, BUSINESS WEEK, CDA Investment Technology, Inc., FORBES MAGAZINE, FORTUNE
MAGAZINE or other industry publications. When comparing its performance to a
market index, the Fund may refer to various statistical measures derived from
the historical performance of the Fund and the index, such as standard deviation
and beta. As with other performance data, performance comparisons should not be
considered indicative of the Fund's relative performance for any future period.
Yield comparisons should not be considered indicative of the Fund's yield and
tax-equivalent
 
                                       52
<PAGE>
yield or relative performance for any future period. In addition, from time to
time the Fund may include its risk-adjusted performance ratings assigned by
Morningstar Publications, Inc. in advertising or supplemental sales literature.
 
                                   CUSTODIAN
 
    The Fund's securities and cash are held under a custody agreement with The
Bank of New York, 90 Washington Street, New York, New York 10286.
 
                   TRANSFER AGENT, DIVIDEND DISBURSING AGENT
                        AND SHAREHOLDER SERVICING AGENT
 
    The transfer agent for the shares of common stock of the Fund is Financial
Data Services, Inc., 4800 Deer Lake Drive East, Jacksonville, Florida
32246-6484, a subsidiary of ML & Co.
 
    Pursuant to a Transfer Agency, Dividend Disbursing Agency and Shareholder
Servicing Agency Agreement with the Fund (the "Transfer Agency Agreement"), the
Transfer Agent is responsible for the issuance, transfer and tender of shares of
common stock and the opening and maintenance of shareholder accounts. Pursuant
to the Transfer Agency Agreement, the Transfer Agent receives an annual fee of
up to $14.00 per shareholder account, and is entitled to reimbursement for
certain transaction charges and out-of-pocket expenses incurred by it under the
Agreement. Additionally, a $.20 monthly closed account charge is assessed on all
accounts that close during the calendar year. Application of this fee commences
the month following the month the account is closed and terminates at the end of
the calendar year. 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. For the period November 3, 1995
(commencement of operations) to October 31, 1996 and for the fiscal years ended
October 31, 1997 and October 31, 1998, the total fees paid by the Fund to the
transfer agent were $71,704, $113,071, and $134,859, respectively, pursuant to
the Transfer Agency Agreement.
 
    SHAREHOLDER REPORTS.  Only one copy of each shareholder report and certain
shareholder communications will be mailed to each identified shareholder
regardless of the number of accounts such shareholder has. If a shareholder
wishes to receive separate copies of each report and communication for each of
the shareholder's related accounts the shareholder should notify in writing:
 
                         Financial Data Services, Inc.
                                 P.O. Box 45289
                        Jacksonville, Florida 32232-5289
 
    The written notification should include the shareholder's name, address, tax
identification number and Merrill Lynch and/or mutual fund account numbers. If
you have any questions regarding this, please call your Merrill Lynch Financial
Consultant or Financial Data Services, Inc. at 800-637-3863.
 
                                       53
<PAGE>
                                 LEGAL OPINIONS
 
    Certain legal matters in connection with the common stock offered hereby
will be passed on for the Fund by Brown & Wood LLP, One World Trade Center, New
York, New York 10048-0557.
 
                              FINANCIAL STATEMENTS
 
    The Fund's audited financial statements are incorporated in this Prospectus
by reference to its 1998 annual report to shareholders. You may request a copy
of the annual report at no charge by calling 1-800-456-4587 ext. 789 between
8:00 a.m. and 8:00 p.m. on any business day.
 
                              INDEPENDENT AUDITORS
 
    Deloitte & Touche LLP, 117 Campus Drive, Princeton, New Jersey 08540, have
been selected as the independent auditors of the Fund. The selection of
independent auditors is subject to ratification by shareholders of the Fund. The
independent auditors are responsible for auditing the financial statements of
the Fund.
 
                                YEAR 2000 ISSUES
 
    Many computer systems were designed using only two digits to designate
years. These systems may not be able to distinguish the Year 2000 from the year
1900 (commonly known as the "Year 2000 Problem"). The Fund could be adversely
affected if the computer systems used by the Investment Adviser or other Fund
service providers do not properly address this problem before January 1, 2000.
The Investment Adviser expects to have addressed this problem before then, and
does not anticipate that the services it provides will be adversely affected.
The Fund's other service providers have told the Investment Adviser that they
also expect to resolve the Year 2000 Problem, and the Investment Adviser will
continue to monitor the situation as the Year 2000 approaches. However, if the
problem has not been fully addressed, the Fund could be negatively affected. The
Year 2000 Problem could also have a negative impact on the issuers of securities
in which the Fund invests, and this could hurt the Fund's investment returns.
 
                                       54
<PAGE>
                                   APPENDIX I
 
                RATINGS OF MUNICIPAL BONDS AND COMMERCIAL PAPER
 
DESCRIPTION OF MOODY'S INVESTORS SERVICE, INC.'S ("MOODY'S") MUNICIPAL BOND
  RATINGS
 
Aaa  Bonds which are rated Aaa are judged to be of the best quality. They carry
     the smallest degree of investment risk and are generally referred to as
     "gilt edge." Interest payments are protected by a large or by an
     exceptionally stable margin and principal is secure. While the various
     protective elements are likely to change, such changes as can be visualized
     are most unlikely to impair the fundamentally strong position of such
     issues.
 
Aa  Bonds which are rated Aa are judged to be of high quality by all standards.
     Together with the Aaa group they comprise what are generally known as high
     grade bonds. They are rated lower than the best bonds because margins of
     protection may not be as large as in Aaa securities or fluctuation of
     protective elements may be of greater amplitude or there may be other
     elements present which make the long-term risks appear somewhat larger than
     in Aaa securities.
 
A   Bonds which are rated A possess many favorable investment attributes and are
     to be considered as upper medium grade obligations. Factors giving security
     to principal and interest are considered adequate, but elements may be
     present which suggest a susceptibility to impairment sometime in the
     future.
 
Baa  Bonds which are rated Baa are considered as medium grade obligations, i.e.,
     they are neither highly protected nor poorly secured. Interest payments and
     principal security appear adequate for the present, but certain protective
     elements may be lacking or may be characteristically unreliable over any
     great length of time. Such bonds lack outstanding investment
     characteristics and in fact have speculative characteristics as well.
 
Ba   Bonds which are rated Ba are judged to have speculative elements; their
     future cannot be considered as well assured. Often the protection of
     interest and principal payments may be very moderate and thereby not well
     safeguarded during both good and bad times over the future. Uncertainty of
     position characterizes bonds in this class.
 
B    Bonds which are rated B generally lack characteristics of the desirable
     investment. Assurance of interest and principal payments or of maintenance
     of other terms of the contract over any long period of time may be small.
 
Caa  Bonds which are rated Caa are of poor standing. Such issues may be in
     default or there may be present elements of danger with respect to
     principal or interest.
 
Ca   Bonds which are rated Ca represent obligations which are speculative in a
     high degree. Such issues are often in default or have other marked
     shortcomings.
 
C    Bonds which are rated C are the lowest rated class of bonds and issues so
     rated can be regarded as having extremely poor prospects of ever attaining
     any real investment standing.
 
                                       55
<PAGE>
    NOTE:  Those bonds in the Aa, A, Baa, Ba and B groups which Moody's believes
possess the strongest investment attributes are designated by the symbols Aa1,
A1, Baa1, Ba1 and B1.
 
    SHORT-TERM NOTES:  The three ratings of Moody's for short-term notes are
MIG-1/VMIG-1, MIG-2/VMIG-2 and MIG-3/VMIG-3. MIG-1/VMIG-1 denotes "best quality,
enjoying strong protection from established cash flows"; MIG-2/VMIG-2 denotes
"high quality" with "ample margins of protection"; MIG-3/VMIG-3 instruments are
of "favorable quality...but...lacking the undeniable strength of the preceding
grades".
 
DESCRIPTION OF MOODY'S COMMERCIAL PAPER RATINGS
 
    Moody's Commercial Paper ratings are opinions of the ability of issuers to
repay punctually promissory obligations not having an original maturity in
excess of nine months. Moody's employs the following three designations, all
judged to be investment grade, to indicate the relative repayment capacity of
rated issuers:
 
        Issuers rated Prime-1 (or supporting institutions) have a superior
    ability for repayment of short-term promissory obligations. Prime-1
    repayment ability will often be evidenced by many of the following
    characteristics: leading market positions in well established industries;
    high rates of return on funds employed; conservative capitalization
    structures with moderate reliance on debt and ample asset protection; broad
    margins in earning coverage of fixed financial charges and high internal
    cash generation; and well established access to a range of financial markets
    and assured sources of alternate liquidity.
 
        Issuers rated Prime-2 (or supporting institutions) have a strong ability
    for repayment of short-term promissory obligations. This will normally be
    evidenced by many of the characteristics cited above but to a lesser degree.
    Earnings trends and coverage ratios, while sound, may be more subject to
    variation. Capitalization characteristics, while still appropriate, may be
    more affected by external conditions. Ample alternate liquidity is
    maintained.
 
        Issuers rated Prime-3 (or supporting institutions) have an acceptable
    ability for repayment of short-term promissory obligations. The effects of
    industry characteristics and market composition may be more pronounced.
    Variability in earnings and profitability may result in changes to the level
    of debt protection measurements and may require relatively high financial
    leverage. Adequate alternate liquidity is maintained.
 
        Issuers rated Not Prime do not fall within any of the Prime rating
    categories.
 
DESCRIPTION OF STANDARD & POOR'S, A DIVISION OF THE MCGRAW-HILL COMPANIES, INC.
  ("STANDARD & POOR'S"), MUNICIPAL DEBT RATINGS
 
    A Standard & Poor's municipal debt rating is a current opinion of the
creditworthiness of an obligor with respect to a specific financial obligation,
a specific class of financial obligations or a specific program. It takes into
consideration the creditworthiness of guarantors, insurers, or other forms of
credit enhancement on the obligation.
 
                                       56
<PAGE>
    The debt rating is not a recommendation to purchase, sell or hold a
financial obligation, inasmuch as it does not comment as to market price or
suitability for a particular investor.
 
    The ratings are based on current information furnished by the obligors or
obtained by Standard & Poor's from other sources Standard & Poor's considers
reliable. Standard & Poor's does not perform an audit in connection with any
rating and may, on occasion, rely on unaudited financial information. The
ratings may be changed, suspended, or withdrawn as a result of changes in, or
unavailability of, such information, or based on circumstances.
 
    The ratings are based, in varying degrees, on the following considerations:
 
        I.  Likelihood of payment--capacity and willingness of the obligor as to
    the timely payment of interest and repayment of principal in accordance with
    the terms of the obligation;
 
        II. Nature of and provisions of the obligation;
 
        III. Protection afforded to, and relative position of, the obligation in
    the event of bankruptcy, reorganization or other arrangement under the laws
    of bankruptcy and other laws affecting creditors' rights.
 
AAA Debt rated "AAA" has the highest rating assigned by Standard & Poor's.
     Capacity to meet its financial commitment on the obligation is extremely
     strong.
 
AA   Debt rated "AA" differs from the highest rated issues only in small degree.
     The Obligor's capacity to meet its financial commitment on the obligation
     is very strong.
 
A    Debt rated "A" is somewhat more susceptible to the adverse effects of
     changes in circumstances and economic conditions than debt in higher-rated
     categories. However, the obligor's capacity to meet its financial
     commitment on the obligation is still strong.
 
BBB  Debt rated "BBB" exhibits adequate protection parameters. However, adverse
     economic conditions or changing circumstances are more likely to lead to a
     weakened capacity of the obligor to meet its financial commitment on the
     obligation.
 
BB   Debt rated "BB," "B," "CCC," "CC" and "C" are regarded as having
B    significant speculative characteristics. "BB" indicates the least degree of
CCC  speculation and "C" the highest degree of speculation. While such debt will
CC   likely have some quality and protective characteristics, these may be
C    outweighed by large uncertainties or major risk exposures to adverse
     conditions.
 
D    Debt rated "D" is in payment default. The "D" rating category is used when
     payments on an obligation are not made on the date due even if the
     applicable grace period has not expired, unless Standard & Poor's believes
     that such payments will be made during such grace period. The "D" rating
     also will be used upon the filing of a bankruptcy petition or the taking of
     similar action if payments on an obligation are jeopardized.
 
      Plus (+) or Minus (-): The ratings from "AA" to "CCC" may be modified by
the addition of a plus or minus sign to show relative standing within the major
rating categories.
 
                                       57
<PAGE>
DESCRIPTION OF STANDARD & POOR'S COMMERCIAL PAPER RATINGS
 
    A Standard & Poor's commercial paper rating is a current assessment of the
likelihood of timely payment of debt having an original maturity of no more than
365 days. Ratings are graded into several categories, ranging from "A-1" for the
highest-quality obligations to "D" for the lowest. These categories are as
follows:
 
A-1  This designation indicates that the degree of safety regarding timely
     payment is strong. Those issues determined to possess extremely strong
     safety characteristics are denoted with a plus sign (+) designation.
 
A-2  Capacity for timely payment on issues with this designation is
     satisfactory. However, the relative degree of safety is not as high as for
     issues designated "A-1."
 
A-3  Issues carrying this designation have an adequate capacity for timely
     payment. They are, however, more vulnerable to the adverse effects of
     changes in circumstances than obligations carrying the higher designations.
 
B   Issues rated "B" are regarded as having only speculative capacity for timely
     payment.
 
C   This rating is assigned to short-term debt obligations with a doubtful
     capacity for payment.
 
D   Debt rated "D" is in payment default. The "D" rating category is used when
     interest payments or principal payments are not made on the date due, even
     if the applicable grace period has not expired unless Standard & Poor's
     believes that such payments will be made during such grace period.
 
    A commercial paper rating is not a recommendation to purchase or sell a
security. The ratings are based on current information furnished to Standard &
Poor's by the issuer or obtained by Standard & Poor's from other sources it
considers reliable. The ratings may be changed, suspended, or withdrawn as a
result of changes in, or unavailability of, such information.
 
    A Standard & Poor's note rating reflects the liquidity factors and market
access risks unique to notes. Notes due in three years or less will likely
receive a note rating. Notes maturing beyond three years will most likely
receive a long-term debt rating. The following criteria will be used in making
that assessment.
 
    --Amortization schedule--the larger the final maturity relative to other
maturities, the more likely it will be treated as a note.
 
    --Source of payment--the more dependent the issue is on the market for its
refinancing, the more likely it will be treated as a note.
 
Note rating symbols are as follows:
 
SP-1  Strong capacity to pay principal and interest. An issue determined to
     possess a very strong capacity to pay debt service is given a plus (+)
     designation.
 
SP-2  Satisfactory capacity to pay principal and interest with some
     vulnerability to adverse financial and economic changes over the term of
     the notes.
 
                                       58
<PAGE>
SP-3  Speculative capacity to pay principal and interest.
 
DESCRIPTION OF FITCH IBCA, INC.'S ("FITCH") INVESTMENT GRADE BOND RATINGS
 
    Fitch investment grade bond ratings provide a guide to investors in
determining the credit risk associated with a particular security. The rating
represents Fitch's assessment of the issuer's ability to meet the obligations of
a specific debt issue or class of debt in a timely manner.
 
    The rating takes into consideration special features of the issue, its
relationship to other obligations of the issuer, the current and prospective
financial condition and operating performance of the issuer and any guarantor,
as well as the economic and political environment that might affect the issuer's
future financial strength and credit quality.
 
    Fitch ratings do not reflect any credit enhancement that may be provided by
insurance policies or financial guarantees unless otherwise indicated.
 
    Bonds carrying the same rating are of similar but not necessarily identical
credit quality since the rating categories do not fully reflect small
differences in the degrees of credit risk.
 
    Fitch ratings are not recommendations to buy, sell, or hold any security.
Ratings do not comment on the adequacy of market price, the suitability of any
security for a particular investor, or the tax-exempt nature or taxability of
payments made in respect of any security.
 
    Fitch ratings are based on information obtained from issuers, other
obligors, underwriters, their experts, and other sources Fitch believes to be
reliable. Fitch does not audit or verify the truth or accuracy of such
information. Ratings may be changed, suspended, or withdrawn as a result of
changes in, or the unavailability of, information or for other reasons.
 
AAA Bonds considered to be investment grade and of the highest credit quality.
     The obligor has an exceptionally strong ability to pay interest and repay
     principal, which is unlikely to be affected by reasonably foreseeable
     events.
 
AA   Bonds considered to be investment grade and of very high credit quality.
     The obligor's ability to pay interest and repay principal is very strong,
     although not quite as strong as bonds rated "AAA." Because bonds rated in
     the "AAA" and "AA" categories are not significantly vulnerable to
     foreseeable future developments, short-term debt of these issuers is
     generally rated "F-1+."
 
A    Bonds considered to be investment grade and of high credit quality. The
     obligor's ability to pay interest and repay principal is considered to be
     strong, but may be more vulnerable to adverse changes in economic
     conditions and circumstances than bonds with higher ratings.
 
BBB  Bonds considered to be investment grade and of satisfactory-credit quality.
     The obligor's ability to pay interest and repay principal is considered to
     be adequate. Adverse changes in economic conditions and circumstances,
     however, are more likely to have adverse impact on these bonds, and
     therefore impair timely payment. The likelihood that the ratings of these
     bonds will fall below investment grade is higher than for bonds with higher
     ratings.
 
                                       59
<PAGE>
    Plus (+) or Minus (-): Plus and minus signs are used with a rating symbol to
indicate the relative position of a credit within the rating category. Plus and
minus signs, however, are not used in the "AAA" category.
 
<TABLE>
<S>          <C>
NR           Indicates that Fitch does not rate the specific issue.
 
Conditional  A conditional rating is premised on the successful completion of a project or
             the occurrence of a specific event.
 
Suspended    A rating is suspended when Fitch deems the amount of information available from
             the issuer to be inadequate for rating purposes.
 
Withdrawn    A rating will be withdrawn when an issue matures or is called or refinanced
             and, at Fitch's discretion, when an issuer fails to furnish proper and timely
             information.
 
FitchAlert   Ratings are placed on FitchAlert to notify investors of an occurrence that is
             likely to result in a rating change and the likely direction of such change.
             These are designated as "Positive," indicating a potential upgrade, "Negative,"
             for potential downgrade, or "Evolving," where ratings may be raised or lowered.
             FitchAlert is relatively short-term, and should be resolved within 12 months.
</TABLE>
 
    Ratings Outlook: An outlook is used to describe the most likely direction of
any rating change over the intermediate term. It is described as "Positive" or
"Negative." The absence of a designation indicates a stable outlook.
 
DESCRIPTION OF FITCH'S SPECULATIVE GRADE BOND RATINGS
 
    Fitch speculative grade bond ratings provide a guide to investors in
determining the credit risk associated with a particular security. The ratings
("BB" to "C") represent Fitch's assessment of the likelihood of timely payment
of principal and interest in accordance with the terms of obligation for bond
issues not in default. For defaulted bonds, the rating ("DDD" to "D") is an
assessment of the ultimate recovery value through reorganization or liquidation.
 
    The rating takes into consideration special features of the issue, its
relationship to other obligations of the issuer, the current and prospective
financial condition and operating performance of the issuer and any guarantor,
as well as the economic and political environment that might affect the issuer's
future financial strength.
 
    Bonds that have the rating are of similar but not necessarily identical
credit quality since rating categories cannot fully reflect the differences in
degrees of credit risk.
 
BB   Bonds are considered speculative. The obligor's ability to pay interest and
     repay principal may be affected over time by adverse economic changes.
     However, business and financial alternatives can be identified which could
     assist the obligor in satisfying its debt service requirements.
 
B    Bonds are considered highly speculative. While bonds in this class are
     currently meeting debt service requirements, the probability of continued
     timely payment of principal and interest reflects the obligor's limited
     margin of safety and the need for reasonable business and economic activity
     throughout the life of the issue.
 
                                       60
<PAGE>
CCC  Bonds have certain identifiable characteristics which, if not remedied, may
     lead to default. The ability to meet obligations requires an advantageous
     business and economic environment.
 
CC   Bonds are minimally protected. Default in payment of interest and/or
     principal seems probable over time.
 
C    Bonds are in imminent default in payment of interest or principal.
 
DDD  Bonds are in default on interest and/or principal payments. Such bonds are
DD   extremely speculative and should be valued on the basis of their ultimate
D    recovery value in liquidation or reorganization of the obligor. "DDD"
     represents the highest potential for recovery on these bonds, and "D"
     represents the lowest potential for recovery.
 
      Plus (+) or Minus (-): Plus and minus signs are used with a rating symbol
to indicate the relative position of a credit within the rating category. Plus
and minus signs, however, are not used in the "DDD," "DD," or "D" categories.
 
DESCRIPTION OF FITCH'S SHORT-TERM RATINGS
 
    Fitch's short-term ratings apply to debt obligations that are payable on
demand or have original maturities of up to three years, including commercial
paper, certificates of deposit, medium-term notes, and municipal and investment
notes.
 
    The short-term rating places greater emphasis than a long-term rating on the
existence of liquidity necessary to meet the issuer's obligations in a timely
manner.
 
      Fitch short-term ratings are as follows:
 
F-1+  Exceptionally Strong Credit Quality. Issues assigned this rating are
     regarded as having the strongest degree of assurance for timely payment.
 
F-1   Very Strong Credit Quality. Issues assigned this rating reflect an
     assurance of timely payment only slightly less in degree than issues rated
     "F-1+."
 
F-2   Good Credit Quality. Issues assigned this rating have a satisfactory
     degree of assurance for timely payment, but the margin of safety is not as
     great as for issues assigned "F-1+" and "F-1" ratings.
 
F-3   Fair Credit Quality. Issues assigned this rating have characteristics
     suggesting that the degree of assurance for timely payment is adequate;
     however, near-term adverse changes could cause these securities to be rated
     below investment grade.
 
F-S   Weak Credit Quality. Issues assigned this rating have characteristics
     suggesting a minimal degree of assurance for timely payment and are
     vulnerable to near-term adverse changes in financial and economic
     conditions.
 
D    Default. Issues assigned this rating are in actual or imminent payment
     default.
 
LOC  The symbol "LOC" indicates that the rating is based on a letter of credit
     issued by a commercial bank.
 
                                       61
<PAGE>
                                  APPENDIX II
 
                       TAXABLE EQUIVALENT YIELDS FOR 1999
 
<TABLE>
<CAPTION>
             TAXABLE INCOME*
- ------------------------------------------     1999                           A TAX-EXEMPT YIELD OF
       SINGLE                JOINT            FEDERAL    ----------------------------------------------------------------
       RETURN                RETURN         TAX BRACKET    5.00%      5.50%      6.00%      6.50%      7.00%      7.50%
- --------------------  --------------------  -----------  ---------  ---------  ---------  ---------  ---------  ---------
                                                                          IS EQUAL TO A TAXABLE YIELD OF
<S>                   <C>                   <C>          <C>        <C>        <C>        <C>        <C>        <C>
$ 25,751-$ 62,450        $ 43,051-$104,050      28.00%       6.94%      7.64%      8.33%      9.03%      9.72%     10.42%
$ 62,451-$130,250        $104,051-$158,550      31.00%       7.25%      7.97%      8.70%      9.42%     10.14%     10.87%
$130,251-$283,150        $158,551-$283,150      36.00%       7.81%      8.59%      9.38%     10.16%     10.94%     11.72%
Over $283,150         Over $283,150             39.60%       8.28%      9.11%      9.93%     10.76%     11.59%     12.42%
</TABLE>
 
- ------------------------
 
*   An investor's marginal tax rates may exceed the rates shown in the above
    table due to the reduction, or possible elimination, of the personal
    exemption deduction for high-income taxpayers and an overall limit on
    itemized deductions. Income also may be subject to certain state and local
    taxes. For investors who pay alternative minimum tax, tax-exempt yields may
    be equivalent to lower taxable yields than those shown above. The tax rates
    shown above do not apply to corporate taxpayers. The tax characteristics of
    the Fund are described more fully elsewhere in this Prospectus. Consult your
    tax adviser for further details. This chart is for illustrative purposes
    only and cannot be taken as an indication of anticipated Fund performance.
 
                                       62
<PAGE>
                             [CHART]
 
                  MERRILL LYNCH MUNICIPAL STRATEGY FUND, INC.
 
                                       63
<PAGE>
  INFORMATION ABOUT THE FUND CAN BE REVIEWED AND COPIED AT THE SEC'S PUBLIC
REFERENCE ROOM IN WASHINGTON, D.C. CALL 1-888-SEC-0330 FOR INFORMATION ON THE
OPERATION OF THE PUBLIC REFERENCE ROOM. THIS INFORMATION IS ALSO AVAILABLE ON
THE SEC'S INTERNET SITE AT HTTP://WWW.SEC.GOV AND COPIES MAY BE OBTAINED UPON
PAYMENT OF A DUPLICATION FEE BY WRITING THE PUBLIC REFERENCE ROOM OF THE SEC,
WASHINGTON, D.C. 20549-6009.
 
  YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS. NO ONE
IS AUTHORIZED TO PROVIDE YOU WITH INFORMATION THAT IS DIFFERENT.
                           --------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                    PAGE
                                                    ----
<S>                                                 <C>
Prospectus Summary................................    2
Risk Factors and Special Considerations...........    8
Fee Table.........................................   11
Financial Highlights..............................   13
The Fund..........................................   14
Investment Objective and Policies.................   14
Risks and Special Considerations of Leverage......   24
Investment Restrictions...........................   28
Purchase of Shares................................   29
Tender Offers.....................................   31
Contingent Deferred Sales Charge..................   33
Directors and Officers............................   34
Investment Advisory and Administrative
 Arrangements.....................................   37
Portfolio Transactions............................   39
Dividends and Distributions.......................   41
Taxes.............................................   42
Automatic Dividend Reinvestment Plan..............   47
Net Asset Value...................................   47
Description of Capital Stock......................   48
Performance Data..................................   52
Custodian.........................................   53
Transfer Agent, Dividend Disbursing Agent and
 Shareholder Servicing Agent......................   53
Legal Opinions....................................   54
Financial Statements..............................   54
Independent Auditors..............................   54
Year 2000 Issues..................................   54
Appendix I--Ratings of Municipal Bonds and
 Commercial Paper.................................   55
Appendix II--Taxable Equivalent Yields for 1999...   62
</TABLE>
 
                                                               CODE # 18302-0299
 
[LOGO]
 
      MERRILL LYNCH
 
MERRILL LYNCH
 
MUNICIPAL STRATEGY
 
FUND, INC.
 
                                                             [LOGO]
 
PROSPECTUS
February 19, 1999
Distributor
Merrill Lynch
Funds Distributor,
a division of
Princeton Funds
Distributor, Inc.
This prospectus should be
retained for future reference.


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