MERRILL LYNCH MASSACHUSETTS MUNICIPAL BOND FUND
485BPOS, 1997-10-28
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<PAGE>
 
    
 AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 28, 1997     
                                                SECURITIES ACT FILE NO. 33-35987
                                        INVESTMENT COMPANY ACT FILE NO. 811-4375
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                               ----------------
 
                                   FORM N-1A
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933          [X]
                          PRE-EFFECTIVE AMENDMENT NO.                        [_]
                                                                             [X]
                      POST-EFFECTIVE AMENDMENT NO. 7     
                                     AND/OR
        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940      [X]
                                                                             [X]
                             AMENDMENT NO. 142     
                        (Check appropriate box or boxes)
 
                               ----------------
 
                MERRILL LYNCH MASSACHUSETTS MUNICIPAL BOND FUND
              OF MERRILL LYNCH MULTI-STATE MUNICIPAL SERIES TRUST
               (Exact Name of Registrant as Specified in Charter)
 
                 800 SCUDDERS MILL ROAD
                 PLAINSBORO, NEW JERSEY                               08536
         (Address of Principal Executive Office)                    (Zip Code)
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE (609) 282-2800
 
                                ARTHUR ZEIKEL 
               MERRILL LYNCH MULTI-STATE MUNICIPAL SERIES TRUST 
                800 SCUDDERS MILL ROAD, PLAINSBORO, NEW JERSEY 
       MAILING ADDRESS: P.O. BOX 9011, PRINCETON, NEW JERSEY 08543-9011
                    (Name and Address of Agent for Service)
 
                               ----------------
 
                                   COPIES TO:
 
        COUNSEL FOR THE TRUST:               PHILIP L. KIRSTEIN, ESQ.
           BROWN & WOOD LLP                   FUND ASSET MANAGEMENT
        ONE WORLD TRADE CENTER                    P.O. BOX 9011
    NEW YORK, NEW YORK 10048-0557        PRINCETON, NEW JERSEY 08543-9011
ATTENTION: THOMAS R. SMITH, JR., ESQ.
 
                               ----------------
 
 IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (CHECK APPROPRIATE BOX)
                       
                    [X] immediately upon filing pursuant to paragraph (b)     
                       
                    [_] on (date) pursuant to paragraph (b)     
                    [_] 60 days after filing pursuant to paragraph (a)(1)
                    [_] on (date) pursuant to paragraph (a)(1)
                    [_] 75 days after filing pursuant to paragraph (a)(2)
                    [_] on (date) pursuant to paragraph (a)(2) of Rule 485.
 
            IF APPROPRIATE, CHECK THE FOLLOWING BOX:
                    [_] this post-effective amendment designates a new
                        effective date for a previously filed post-effective
                        amendment.
                           
       
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
               MERRILL LYNCH MASSACHUSETTS MUNICIPAL BOND FUND OF
                MERRILL LYNCH MULTI-STATE MUNICIPAL SERIES TRUST
 
                      REGISTRATION STATEMENT ON FORM N-1A
 
                             CROSS REFERENCE SHEET
 
<TABLE>   
<CAPTION>
 N-1A
 ITEM NO.                                               LOCATION
 --------                                               --------
 <C>         <S>                         <C>
 PART A
  Item  1.   Cover Page...............   Cover Page
  Item  2.   Synopsis.................   Fee Table
             Condensed Financial
  Item  3.   Information..............   Financial Highlights; Performance Data
  Item  4.   General Description of      
             Registrant...............   Investment Objective and Policies;
                                          Additional Information           
  Item  5.   Management of the Fund...   Fee Table; Management of the Trust;
                                          Inside Back Cover Page
  Item  5A.  Management's Discussion
             of Fund  Performance.....   Not Applicable
  Item  6.   Capital Stock and Other     
             Securities...............   Cover Page; Merrill Lynch Select
                                          Pricing SM System; Additional  
                                          Information                     
  Item  7.   Purchase of Securities      
             Being Offered............   Cover Page; Fee Table; Merrill Lynch  
                                          Select Pricing SM System; Purchase of
                                          Shares; Shareholder Services;        
                                          Additional Information; Inside Back  
                                          Cover Page                            
  Item  8.   Redemption or Repurchase.   Fee Table; Merrill Lynch Select
                                          Pricing SM System; Purchase of Shares;
                                          Redemption of Shares
  Item  9.   Pending Legal               
             Proceedings..............   Not Applicable 
 
PART B
  Item 10.   Cover Page...............   Cover Page
  Item 11.   Table of Contents........   Back Cover Page
  Item 12.   General Information and     
             History..................   Additional Information 
  Item 13.   Investment Objective and    
             Policies.................   Investment Objective and Policies 
  Item 14.   Management of the Fund...   Management of the Trust
  Item 15.   Control Persons and
              Principal Holders of       
              Securities..............   Management of the Trust; General    
                                          Information--Additional Information 
  Item 16.   Investment Advisory and     
             Other Services...........   Management of the Trust; Purchase of
                                          Shares; General Information        
  Item 17.   Brokerage Allocation and    
             Other Practices..........   Portfolio Transactions 
  Item 18.   Capital Stock and Other     
             Securities...............   General Information--Description of
  Item 19.   Purchase, Redemption and     Shares                            
              Pricing of Securities      
              Being Offered...........   Purchase of Shares; Redemption of 
                                          Shares; Determination of Net Asset
                                          Value; Shareholder Services       
  Item 20.   Tax Status...............   Distributions and Taxes
  Item 21.   Underwriters.............   Purchase of Shares
  Item 22.   Calculation of              
             Performance Data.........   Performance Data 
  Item 23.   Financial Statements.....   Financial Statements
</TABLE>    
 
PART C
  Information required to be included in Part C is set forth under the
appropriate Item, so numbered, in Part C to this Registration Statement.
<PAGE>
 
PROSPECTUS
   
OCTOBER 28, 1997     
 
                MERRILL LYNCH MASSACHUSETTS MUNICIPAL BOND FUND
               MERRILL LYNCH MULTI-STATE MUNICIPAL SERIES TRUST
  P.O. BOX 9011, PRINCETON, NEW JERSEY 08543-9011 . PHONE NO. (609) 282-2800
   
  Merrill Lynch Massachusetts Municipal Bond Fund (the "Fund") is a mutual
fund that seeks to provide shareholders with as high a level of income exempt
from Federal and Massachusetts personal income taxes as is consistent with
prudent investment management. The Fund invests primarily in a non-diversified
portfolio of long-term, investment grade obligations issued by or on behalf of
The Commonwealth of Massachusetts, its political subdivisions, agencies and
instrumentalities and obligations of other qualifying issuers, such as issuers
located in Puerto Rico, the U.S. Virgin Islands and Guam, which pay interest
exempt from Federal and Massachusetts income taxes ("Massachusetts Municipal
Bonds"). Dividends paid by the Fund are exempt from Federal and Massachusetts
income taxes to the extent they are paid from interest on Massachusetts
Municipal Bonds. The Fund may invest in certain tax-exempt securities
classified as "private activity bonds" that may subject certain investors in
the Fund to an alternative minimum tax. At times, the Fund may seek to hedge
its portfolio through the use of futures transactions and options. There can
be no assurance that the investment objective of the Fund will be realized.
For more information on the Fund's investment objective and policies, please
see "Investment Objective and Policies" on page 11.     
 
                               ----------------
  Pursuant to the Merrill Lynch Select Pricing SM System, the Fund offers four
classes of shares, each with a different combination of sales charges, ongoing
fees and other features. The Merrill Lynch Select Pricing SM System permits an
investor to choose the method of purchasing shares that the investor believes
is most beneficial given the amount of the purchase, the length of time the
investor expects to hold the shares and other relevant circumstances. See
"Merrill Lynch Select Pricing SM System" on page 4.
   
  Shares may be purchased directly from Merrill Lynch Funds Distributor, Inc.
(the "Distributor"), P.O. Box 9081, Princeton, New Jersey 08543-9081 [(609)
282-2800], and other securities dealers which have entered into selected
dealer agreements with the Distributor, including Merrill Lynch, Pierce,
Fenner & Smith Incorporated ("Merrill Lynch"). The minimum initial purchase is
$1,000 and the minimum subsequent purchase is $50 except that for participants
in certain fee-based programs the minimum initial purchase is $500 and the
minimum subsequent purchase is $50. Merrill Lynch may charge its customers a
processing fee (presently $5.35) for confirming purchases and repurchases.
Purchases and redemptions made directly through Merrill Lynch Financial Data
Services, Inc. (the "Transfer Agent") are not subject to the processing fee.
See "Purchase of Shares" and "Redemption of Shares."     
                               ----------------
     
  THESE SECURITIES  HAVE NOT BEEN APPROVED OR DISAPPROVED BY  THE SECURITIES
     AND EXCHANGE COMMISSION NOR HAS THE COMMISSION PASSED UPON THE ACCU-
        RACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
          CONTRARY IS A CRIMINAL OFFENSE.     
 
                               ----------------
   
  This Prospectus is a concise statement of information about the Fund that is
relevant to making an investment in the Fund. This Prospectus should be
retained for future reference. A statement containing additional information
about the Fund, dated October 28, 1997 (the "Statement of Additional
Information"), has been filed with the Securities and Exchange Commission (the
"Commission") and is available, without charge, by calling or by writing
Merrill Lynch Multi-State Municipal Series Trust (the "Trust") at the above
telephone number or address. The Commission maintains a Web site
(http://www.sec.gov) that contains the Statement of Additional Information,
material incorporated by reference and other information regarding the Fund.
The Statement of Additional Information is hereby incorporated by reference
into this Prospectus. The Fund is a separate series of the Trust, an open-end
management investment company organized as a Massachusetts business trust.
    
                               ----------------
 
                       FUND ASSET MANAGEMENT -- MANAGER
 
             MERRILL LYNCH FUNDS DISTRIBUTOR, INC. -- DISTRIBUTOR
<PAGE>
 
                                   FEE TABLE
 
  A general comparison of the sales arrangements and other nonrecurring and
recurring expenses applicable to shares of the Fund follows:
 
<TABLE>   
<CAPTION>
                    CLASS A(a)         CLASS B(b)          CLASS C    CLASS D
                    ----------         ----------        ------------ -------
<S>                 <C>         <C>                      <C>          <C>
SHAREHOLDER TRANS-
 ACTION EXPENSES:
 Maximum Sales
  Charge Imposed
  on Purchases (as
  a percentage of
  offering price).    4.00%(c)            None               None      4.00%(c)
 Sales Charge
  Imposed on
  Dividend
  Reinvestments...     None               None               None       None
 Deferred Sales
  Charge (as a
  percentage of
  original pur-
  chase price or
  redemption pro-
  ceeds, whichever                                        1.0% for one
  is lower).......     None(d) 4.0% during the first year,  year(f)     None(d)
                                decreasing 1.0% annually
                                thereafter to 0.0% after
                                   the fourth year(e)
 Exchange Fee.....     None               None               None       None
ANNUAL FUND OPER-
 ATING EXPENSES
 (AS A PERCENTAGE
 OF AVERAGE NET
 ASSETS):
 Management
  Fees(g).........    0.55%              0.55%              0.55%      0.55%
 Rule 12b-1
  Fees(h):
 Account Mainte-
  nance Fees......     None              0.25%              0.25%      0.10%
 Distribution
  Fees............     None              0.25%              0.35%       None
                                (Class B shares convert
                                   to Class D shares
                                     automatically
                             after approximately ten years
                                and cease being subject
                                to distribution fees and
                              are subject to lower account
                                    maintenance fees)
 Other Expenses:
 Custodian Fees...    0.01%              0.01%              0.01%      0.01%
 Shareholder Ser-
  vicing Costs(i).    0.04%              0.05%              0.05%      0.04%
 Other............    0.23%              0.23%              0.22%      0.23%
                      -----              -----              -----      -----
  Total Other Ex-     0.28%              0.29%              0.28%      0.28%
   penses.........    -----              -----              -----      -----
 Total Fund Oper-     0.83%              1.34%              1.43%      0.93%
  ating Expenses..    =====              =====              =====      =====
</TABLE>    
- --------
   
(a) Class A shares are sold to a limited group of investors including existing
    Class A shareholders and certain participants in fee-based programs. See
    "Purchase of Shares--Initial Sales Charge Alternatives--Class A and Class
    D Shares"--page 25 and "Shareholder Services--Fee-Based Programs"--page
    36.     
   
(b) Class B shares convert to Class D shares automatically approximately ten
    years after initial purchase. See "Purchase of Shares--Deferred Sales
    Charge Alternatives--Class B and Class C Shares"--page 26.     
   
(c) Reduced for purchases of $25,000 and over and waived for purchases of
    Class A shares by participants in connection with certain fee-based
    programs. Class A and Class D purchases of $1,000,000 or more may not be
    subject to an initial sales charge. See "Purchase of Shares--Initial Sales
    Charge Alternatives--Class A and Class D Shares"--page 25.     
   
(d) Class A and Class D shares are not subject to a contingent deferred sales
    charge ("CDSC"), except that certain purchases of $1,000,000 or more are
    not subject to an initial sales charge may instead be subject to a CDSC of
    1.0% of amounts redeemed within the first year after purchase. Such CDSC
    may be waived in connection with certain fee-based programs. See
    "Shareholder Services--Fee-Based Programs"--page 36.     
                                             (Footnotes continued on next page)
 
                                       2
<PAGE>
 
   
(e) The CDSC may be modified in connection with certain fee-based programs. See
    "Shareholder Services--Fee-Based Programs"--page 36.     
   
(f) The CDSC may be waived in connection with certain fee-based programs. See
    "Shareholder Services--Fee-Based Programs"--page 36.     
   
(g) See "Management of the Trust--Management and Advisory Arrangements"--page
    21.     
   
(h) See "Purchase of Shares--Distribution Plans"--page 29.     
   
(i) See "Management of the Trust--Transfer Agency Services"--page 22.     
 
EXAMPLE:
 
<TABLE>   
<CAPTION>
                            CUMULATIVE EXPENSES PAID FOR THE PERIOD OF:
                            --------------------------------------------------
                             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
 including the maximum $40
 initial sales charge
 (Class A and Class D
 shares only) and assuming
 (1) the Total Fund
 Operating Expenses for
 each class set forth on
 page 2, (2) a 5% annual
 return throughout the
 periods and (3) redemption
 at the end of the period
 (including any applicable
 CDSC for Class B and Class
 C shares):
  Class A..................         $48           $65          $84          $138
  Class B..................         $54           $62          $73          $161
  Class C..................         $25           $45          $78          $171
  Class D..................         $49           $68          $89          $150
An investor would pay the
 following expenses on the
 same $1,000 investment
 assuming no redemption at
 the end of the period:
  Class A..................         $48           $65          $84          $138
  Class B..................         $14           $42          $73          $161
  Class C..................         $15           $45          $78          $171
  Class D..................         $49           $68          $89          $150
</TABLE>    
   
  The foregoing 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 Example set forth above assumes reinvestment of all dividends
and distributions and utilizes a 5% annual rate of return as mandated by
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. Class B and Class C shareholders who hold their shares for an
extended period of time may pay more in Rule 12b-1 distribution fees than the
economic equivalent of the maximum front-end sales charge permitted under the
Conduct Rules of the National Association of Securities Dealers, Inc. (the
"NASD"). Merrill Lynch may charge its customers a processing fee (presently
$5.35) for confirming purchases and repurchases. Purchases and redemptions made
directly through the Fund's Transfer Agent are not subject to the processing
fee. See "Purchase of Shares" and "Redemption of Shares."     
 
                                       3
<PAGE>
 
                    MERRILL LYNCH SELECT PRICING SM SYSTEM
   
  The Fund offers four classes of shares under the Merrill Lynch Select
Pricing SM System. The shares of each class may be purchased at a price equal
to the next determined net asset value per share subject to the sales charges
and ongoing fee arrangements described below. Shares of Class A and Class D
are sold to investors choosing the initial sales charge alternatives, and
shares of Class B and Class C are sold to investors choosing the deferred
sales charge alternatives. The Merrill Lynch Select Pricing SM System is used
by more than 50 registered investment companies advised by Merrill Lynch Asset
Management, L.P. ("MLAM") or Fund Asset Management, L.P. ("FAM" or the
"Manager"), an affiliate of MLAM. Funds advised by MLAM or FAM that utilize
the Merrill Lynch Select Pricing SM System are referred to herein as "MLAM-
advised mutual funds."     
   
  Each Class A, Class B, Class C or Class D share of the Fund represents an
identical interest in the investment portfolio of the Fund and has the same
rights, except that Class B, Class C and Class D shares bear the expenses of
the ongoing account maintenance fees and Class B and Class C shares bear the
expenses of the ongoing distribution fees and the additional incremental
transfer agency costs resulting from the deferred sales charge arrangements.
The CDSCs, distribution and account maintenance fees that are imposed on Class
B and Class C shares, as well as the account maintenance fees that are imposed
on Class D shares, are imposed directly against those classes and not against
all assets of the Fund and, accordingly, such charges will not affect the net
asset value of any other class or have any impact on investors choosing
another sales charge option. Dividends paid by the Fund for each class of
shares will be calculated in the same manner at the same time and will differ
only to the extent that account maintenance and distribution fees and any
incremental transfer agency costs relating to a particular class are borne
exclusively by that class. Each class has different exchange privileges. See
"Shareholder Services--Exchange Privilege."     
   
  Investors should understand that the purpose and function of the initial
sales charges with respect to the Class A and Class D shares are the same as
those of the CDSCs and distribution fees with respect to the Class B and Class
C shares in that the sales charges and distribution fees applicable to each
class provide for the financing of the distribution of the shares of the Fund.
The distribution-related revenues paid with respect to a class will not be
used to finance the distribution expenditures of another class. Sales
personnel may receive different compensation for selling different classes of
shares.     
   
  The following table sets forth a summary of the distribution arrangements
for each class of shares under the Merrill Lynch Select Pricing SM System,
followed by a more detailed description of each class and a discussion of the
factors that investors should consider in determining the method of purchasing
shares under the Merrill Lynch Select Pricing SM System that the investor
believes is most beneficial under his particular circumstances. More detailed
information as to each class of shares is set forth under "Purchase of
Shares."     
 
                                       4
<PAGE>
 
 
<TABLE>   
<CAPTION>
                                          ACCOUNT
                                        MAINTENANCE DISTRIBUTION
 CLASS        SALES CHARGE(/1/)             FEE         FEE        CONVERSION FEATURE
- ---------------------------------------------------------------------------------------
<S>    <C>                              <C>         <C>          <C>
  A         Maximum 4.00% initial           No           No                No
            sales charge(/2/)(/3/)
- ---------------------------------------------------------------------------------------
  B    CDSC for a period of four years,    0.25%        0.25%     B shares convert to
         at a rate of 4.0% during the                            D shares automatically
         first year, decreasing 1.0%                              after approximately
               annually to 0.0%(/4/)                                 ten years(/5/)
- ---------------------------------------------------------------------------------------
  C      1.0% CDSC for one year(/6/)       0.25%        0.35%              No
- ---------------------------------------------------------------------------------------
  D         Maximum 4.00% initial          0.10%         No                No
              sales charge(/3/)
</TABLE>    
- --------
(1) Initial sales charges are imposed at the time of purchase as a percentage
    of the offering price. CDSCs are imposed if the redemption occurs within
    the applicable CDSC time period. The charge will be assessed on an amount
    equal to the lesser of the proceeds of redemption or the cost of the
    shares being redeemed.
   
(2) Offered only to eligible investors. See "Purchase of Shares--Initial Sales
    Charge Alternatives--Class A and Class D Shares--Eligible Class A
    Investors."     
   
(3) Reduced for purchases of $25,000 or more and waived for purchases of Class
    A shares by participants in connection with certain fee-based programs.
    Class A and Class D share purchases of $1,000,000 or more may not be
    subject to an initial sales charge but instead may be subject to a 1.0%
    CDSC if redeemed within one year. Such CDSC may be waived in connection
    with certain fee-based programs. See "Class A" and "Class D" below.     
   
(4) The CDSC may be modified in connection with certain fee-based programs.
        
(5) The conversion period for dividend reinvestment shares and certain fee-
    based programs may be modified. Also, Class B shares of certain other
    MLAM-advised mutual funds into which exchanges may be made have an eight
    year conversion period. If Class B shares of the Fund are exchanged for
    Class B shares of another MLAM-advised mutual fund, the conversion period
    applicable to the Class B shares acquired in the exchange will apply, and
    the holding period for the shares exchanged will be tacked onto the
    holding period for the shares acquired.
   
(6) The CDSC may be waived in connection with certain fee-based programs.     
   
Class A: Class A shares incur an initial sales charge when they are purchased
         and bear no ongoing distribution or account maintenance fees. Class A
         shares are offered to a limited group of investors and also will be
         issued upon reinvestment of dividends on outstanding Class A shares.
         Investors that currently own Class A shares of the Fund in a
         shareholder account are entitled to purchase additional Class A
         shares of the Fund in that account. Other eligible investors include
         participants in certain fee-based programs. In addition, Class A
         shares will be offered at net asset value to Merrill Lynch & Co.,
         Inc. ("ML & Co.") and its subsidiaries (the term "subsidiaries," when
         used herein with respect to ML & Co., includes MLAM, the Manager and
         certain other entities directly or indirectly wholly owned and
         controlled by ML & Co.) and their directors and employees, and to
         members of the Boards of MLAM-advised mutual funds. The maximum
         initial sales charge of 4.00% is reduced for purchases of $25,000 and
         over and waived for purchases by participants in connection with
         certain fee-based programs. Purchases of $1,000,000 or more may not
         be subject to an initial sales charge, but if the initial sales
         charge is waived, such purchases may be subject to a 1.0% CDSC if the
         shares are redeemed within one year after purchase. Such CDSC may be
         waived in connection with redemptions to fund participation in
         certain fee-based programs. Sales charges also are reduced under a
         right of accumulation that takes into account the investor's     
 
                                       5
<PAGE>
 
         
      holdings of all classes of all MLAM-advised mutual funds. See "Purchase
      of Shares--Initial Sales Charge Alternatives--Class A and Class D
      Shares."     
   
Class B: Class B shares do not incur a sales charge when they are purchased,
         but they are subject to an ongoing account maintenance fee of 0.25%
         and an ongoing distribution fee of 0.25% of the Fund's average net
         assets attributable to Class B shares, as well as a CDSC if they are
         redeemed within four years of purchase. Such CDSC may be modified in
         connection with certain fee-based programs. Approximately ten years
         after issuance, Class B shares will convert automatically into Class D
         shares of the Fund, which are subject to a lower account maintenance
         fee of 0.10% and no distribution fee; Class B shares of certain other
         MLAM-advised mutual funds into which exchanges may be made convert
         into Class D shares automatically after approximately eight years. If
         Class B shares of the Fund are exchanged for Class B shares of another
         MLAM-advised mutual fund, the conversion period applicable to the
         Class B shares acquired in the exchange will apply, as will the Class
         D account maintenance fee of the acquired fund upon the conversion,
         and the holding period for the shares exchanged will be tacked on to
         the holding period for the shares acquired. Automatic conversion of
         Class B shares into Class D shares will occur at least once each month
         on the basis of the relative net asset values of the shares of the two
         classes on the conversion date, without the imposition of any sales
         load, fee or other charge. Conversion of Class B shares to Class D
         shares will not be deemed a purchase or sale of the shares for Federal
         income tax purposes. Shares purchased through reinvestment of
         dividends on Class B shares also will convert automatically to Class D
         shares. The conversion period for dividend reinvestment shares is
         modified as described under "Purchase of Shares--Deferred Sales Charge
         Alternatives--Class B and Class C Shares--Conversion of Class B Shares
         to Class D Shares."     
   
Class C: Class C shares do not incur a sales charge when they are purchased,
         but they are subject to an ongoing account maintenance fee of 0.25%
         and an ongoing distribution fee of 0.35% of the Fund's average net
         assets attributable to Class C shares. Class C shares are also subject
         to a CDSC of 1.0% if they are redeemed within one year of purchase.
         Such CDSC may be waived in connection with certain fee-based programs.
         Although Class C shares are subject to a CDSC for only one year (as
         compared to four years for Class B), Class C shares have no conversion
         feature and, accordingly, an investor who purchases Class C shares
         will be subject to account maintenance fees and higher distribution
         fees that will be imposed on Class C shares for an indefinite period
         subject to annual approval by the Trust's Board of Trustees and
         regulatory limitations.     
   
Class D: Class D shares incur an initial sales charge when they are purchased
         and are subject to an ongoing account maintenance fee of 0.10% of the
         Fund's average net assets attributable to Class D shares. Class D
         shares are not subject to an ongoing distribution fee or any CDSC when
         they are redeemed. The maximum initial sales charge of 4.00% is
         reduced for purchases of $25,000 and over. Purchases of $1,000,000 or
         more may not be subject to an initial sales charge, but if the initial
         sales charge is waived such purchases may be subject to a CDSC of 1.0%
         if the shares are redeemed within one year after purchase. Such CDSC
         may be waived in connection with certain fee-based programs. The
         schedule of initial sales charges and reductions for the Class D
         shares is the same as the schedule for Class A shares, except that
         there is no waiver for purchases of Class D shares in connection with
         certain fee-based programs. Class D shares also will be issued upon
         conversion of Class B shares as described above under "Class B." See
         "Purchase of Shares--Initial Sales Charge Alternatives--Class A and
         Class D Shares."     
 
                                       6
<PAGE>
 
  The following is a discussion of the factors that investors should consider
in determining the method of purchasing shares under the Merrill Lynch Select
Pricing SM System that the investor believes is most beneficial under his
particular circumstances.
   
  Initial Sales Charge Alternatives. Investors who prefer an initial sales
charge alternative may elect to purchase Class D shares or, if an eligible
investor, Class A shares. Investors choosing the initial sales charge
alternative who are eligible to purchase Class A shares should purchase Class
A shares rather than Class D shares because there is an account maintenance
fee imposed on Class D shares. Investors qualifying for significantly reduced
initial sales charges may find the initial sales charge alternative
particularly attractive because similar sales charge reductions are not
available with respect to the CDSCs imposed in connection with purchases of
Class B or Class C shares. Investors not qualifying for reduced initial sales
charges who expect to maintain their investment for an extended period of time
also may elect to purchase Class A or Class D shares, because over time the
accumulated ongoing account maintenance and distribution fees on Class B or
Class C shares may exceed the initial sales charge and, in the case of Class D
shares, the account maintenance fee. Although some investors that previously
purchased Class A shares may no longer be eligible to purchase Class A shares
of other MLAM-advised mutual funds, those previously purchased Class A shares,
together with Class B, Class C and Class D share holdings, will count toward a
right of accumulation that may qualify the investor for reduced initial sales
charges on new initial sales charge purchases. In addition, the ongoing Class
B and Class C account maintenance and distribution fees will cause Class B and
Class C shares to have higher expense ratios, pay lower dividends and have
lower total returns than the initial sales charge shares. The ongoing Class D
account maintenance fees will cause Class D shares to have a higher expense
ratio, pay lower dividends and have a lower total return than Class A shares.
    
  Deferred Sales Charge Alternatives. Because no initial sales charges are
deducted at the time of purchase, Class B and Class C shares provide the
benefit of putting all of the investor's dollars to work from the time the
investment is made. The deferred sales charge alternatives may be particularly
appealing to investors who do not qualify for a reduction in initial sales
charges. Both Class B and Class C shares are subject to ongoing account
maintenance fees and distribution fees; however, the ongoing account
maintenance and distribution fees potentially may be offset to the extent any
return is realized on the additional funds initially invested in Class B or
Class C shares. In addition, Class B shares will be converted into Class D
shares of the Fund after a conversion period of approximately ten years, and
thereafter investors will be subject to lower ongoing fees.
   
  Certain investors may elect to purchase Class B shares if they determine it
to be most advantageous to have all their funds invested initially and intend
to hold their shares for an extended period of time. Investors in Class B
shares should take into account whether they intend to redeem their shares
within the CDSC period and, if not, whether they intend to remain invested
until the end of the conversion period and thereby take advantage of the
reduction in ongoing fees resulting from the conversion into Class D shares.
Other investors, however, may elect to purchase Class C shares if they
determine that it is advantageous to have all their assets invested initially
and they are uncertain as to the length of time they intend to hold their
assets in MLAM-advised mutual funds. Although Class C shareholders are subject
to a shorter CDSC period at a lower rate, they are subject to higher
distribution fees and forgo the Class B conversion feature, making their
investment subject to account maintenance and distribution fees for an
indefinite period of time. In addition, while both Class B and Class C
distribution fees are subject to the limitations on asset-based sales charges
imposed by the NASD, the Class B distribution fees are further limited under a
voluntary waiver of asset-based sales charges. See "Purchase of Shares--
Limitations on the Payment of Deferred Sales Charges."     
 
                                       7
<PAGE>
 
                              FINANCIAL HIGHLIGHTS
   
  The financial information in the table below has been audited in connection
with the annual audits of the financial statements of the Fund by Deloitte &
Touche LLP, independent auditors. Financial statements for the year ended July
31, 1997 and the independent auditors' report thereon are included in the
Statement of Additional Information. The following per share data and ratios
have been derived from information provided in the Fund's audited financial
statements. Further information about the performance of the Fund is contained
in the Fund's most recent annual report to shareholders which may be obtained,
without charge, by calling or by writing the Trust at the telephone number or
address on the front cover of this Prospectus.     
 
<TABLE>   
<CAPTION>
                                               CLASS A
                           ----------------------------------------------------
                                                                     FOR THE
                                                                      PERIOD
                                                                   FEBRUARY 28,
                              FOR THE YEAR ENDED JULY 31,           1992+  TO
                           --------------------------------------    JULY 31,
                            1997    1996    1995    1994    1993       1992
                           ------  ------  ------  ------  ------  ------------
 <S>                       <C>     <C>     <C>     <C>     <C>     <C>
 Increase (Decrease) in
  Net Asset Value:
 PER SHARE OPERATING
  PERFORMANCE:
 Net asset value,
  beginning of period....  $10.60  $10.46  $10.48  $11.07  $10.68     $10.00
                           ------  ------  ------  ------  ------     ------
 Investment income --
   net...................     .56     .56     .56     .58     .63        .25
 Realized and unrealized
  gain (loss) on
  investments -- net.....     .47     .14    (.02)   (.43)    .42        .68
                           ------  ------  ------  ------  ------     ------
 Total from investment
  operations.............    1.03     .70     .54     .15    1.05        .93
                           ------  ------  ------  ------  ------     ------
 Less dividends and
  distributions:
 Investment income --
   net...................    (.56)   (.56)   (.56)   (.58)   (.63)      (.25)
 Realized gain on
  investments -- net.....     --      --      --     (.15)   (.03)       --
 In excess of realized
  gain on investments --
   net...................     --      --      --     (.01)    --         --
                           ------  ------  ------  ------  ------     ------
 Total dividends and
  distributions..........    (.56)   (.56)   (.56)   (.74)   (.66)      (.25)
                           ------  ------  ------  ------  ------     ------
 Net asset value, end of
  period.................  $11.07  $10.60  $10.46  $10.48  $11.07     $10.68
                           ======  ======  ======  ======  ======     ======
 TOTAL INVESTMENT
  RETURN:**
 Based on net asset value
  per share..............   10.02%   6.78%   5.35%   1.26%  10.08%      9.44%#
                           ======  ======  ======  ======  ======     ======
 RATIOS TO AVERAGE NET
  ASSETS:
 Expenses, net of
  reimbursement..........     .83%    .84%    .88%    .62%    .42%       .12%*
                           ======  ======  ======  ======  ======     ======
 Expenses................     .83%    .84%    .91%    .85%    .95%      1.16%*
                           ======  ======  ======  ======  ======     ======
 Investment income --
   net...................    5.22%   5.23%   5.42%   5.33%   5.75%      5.82%*
                           ======  ======  ======  ======  ======     ======
 SUPPLEMENTAL DATA:
 Net assets, end of
  period
  (in thousands).........  $5,757  $5,887  $6,630  $8,367  $7,093     $4,828
                           ======  ======  ======  ======  ======     ======
 Portfolio turnover......   24.64%  56.05%  89.62%  72.13%  39.37%     18.86%
                           ======  ======  ======  ======  ======     ======
</TABLE>    
- --------
 + Commencement of Operations.
 * Annualized.
** Total investment returns exclude the effects of sales loads.
# Aggregate total investment return.
 
                                       8
<PAGE>
 
<TABLE>   
<CAPTION>
                                                 CLASS B
                           ---------------------------------------------------------
                                                                          FOR THE
                                                                           PERIOD
                                                                        FEBRUARY 28,
                                 FOR THE YEAR ENDED JULY 31,             1992+  TO
                           -------------------------------------------    JULY 31,
                            1997     1996     1995     1994     1993        1992
                           -------  -------  -------  -------  -------  ------------
 <S>                       <C>      <C>      <C>      <C>      <C>      <C>
 Increase (Decrease) in
  Net Asset Value:
 PER SHARE OPERATING
  PERFORMANCE:
 Net asset value,
  beginning of period....  $ 10.60  $ 10.46  $ 10.48  $ 11.07  $ 10.68    $ 10.00
                           -------  -------  -------  -------  -------    -------
 Investment income --
   net...................      .51      .51      .50      .53      .57        .23
 Realized and unrealized
  gain (loss) on
  investments -- net.....      .47      .14     (.02)    (.43)     .42        .68
                           -------  -------  -------  -------  -------    -------
 Total from investment
  operations.............      .98      .65      .48      .10      .99        .91
                           -------  -------  -------  -------  -------    -------
 Less dividends and
  distributions:
 Investment income --
   net...................     (.51)    (.51)    (.50)    (.53)    (.57)      (.23)
 Realized gain on
  investments -- net.....      --       --       --      (.15)    (.03)       --
 In excess of realized
  gain on investments --
   net...................      --       --       --      (.01)     --         --
                           -------  -------  -------  -------  -------    -------
 Total dividends and
  distributions..........     (.51)    (.51)    (.50)    (.69)    (.60)      (.23)
                           -------  -------  -------  -------  -------    -------
 Net asset value, end of
  period.................  $ 11.07  $ 10.60  $ 10.46  $ 10.48  $ 11.07    $ 10.68
                           =======  =======  =======  =======  =======    =======
 TOTAL INVESTMENT
  RETURN:**
 Based on net asset value
  per share..............     9.46%    6.23%    4.82%     .75%    9.53%      9.22%#
                           =======  =======  =======  =======  =======    =======
 RATIOS TO AVERAGE NET
  ASSETS:
 Expenses, net of
  reimbursement..........     1.34%    1.35%    1.39%    1.12%     .93%       .62%*
                           =======  =======  =======  =======  =======    =======
 Expenses................     1.34%    1.35%    1.42%    1.36%    1.45%      1.68%*
                           =======  =======  =======  =======  =======    =======
 Investment income --
   net...................     4.71%    4.72%    4.91%    4.83%    5.24%      5.32%*
                           =======  =======  =======  =======  =======    =======
 SUPPLEMENTAL DATA:
 Net assets, end of
  period
  (in thousands).........  $53,336  $59,868  $66,927  $76,436  $71,429    $38,947
                           =======  =======  =======  =======  =======    =======
 Portfolio turnover......    24.64%   56.05%   89.62%   72.13%   39.37%     18.86%
                           =======  =======  =======  =======  =======    =======
</TABLE>    
- --------
   
 + Commencement of Operations.     
   
 * Annualized.     
   
** Total investment returns exclude the effects of sales loads.     
   
# Aggregate total investment return.     
 
                                       9
<PAGE>
 
<TABLE>   
<CAPTION>
                                    CLASS C                       CLASS D
                          ----------------------------- -----------------------------
                                              FOR THE                       FOR THE
                                              PERIOD                        PERIOD
                           FOR THE YEAR     OCTOBER 21,  FOR THE YEAR     OCTOBER 21,
                          ENDED JULY 31,     1994+ TO   ENDED JULY 31,     1994+ TO
                          ----------------   JULY 31,   ----------------   JULY 31,
                           1997     1996       1995      1997     1996       1995
                          -------  -------  ----------- -------  -------  -----------
<S>                       <C>      <C>      <C>         <C>      <C>      <C>
Increase (Decrease) in
 Net Asset Value:
PER SHARE OPERATING
 PERFORMANCE:
Net asset value,
 beginning of period....  $ 10.60  $ 10.46    $10.03    $ 10.61  $ 10.47    $10.03
                          -------  -------    ------    -------  -------    ------
Investment income --
  net...................      .49      .49       .37        .55      .55       .42
Realized and unrealized
 gain on investments --
  net...................      .46      .14       .43        .46      .14       .44
                          -------  -------    ------    -------  -------    ------
Total from investment
 operations.............      .95      .63       .80       1.01      .69       .86
                          -------  -------    ------    -------  -------    ------
Less dividends from
 investment income --
  net...................     (.49)    (.49)     (.37)      (.55)    (.55)     (.42)
                          -------  -------    ------    -------  -------    ------
Net asset value, end of
 period.................  $ 11.06   $10.60    $10.46    $ 11.07   $10.61    $10.47
                          =======  =======    ======    =======  =======    ======
TOTAL INVESTMENT
 RETURN:**
Based on net asset value
 per share..............     9.25%    6.12%     8.13%#     9.80%    6.67%     8.70%#
                          =======  =======    ======    =======  =======    ======
RATIOS TO AVERAGE NET
 ASSETS:
Expenses................     1.43%    1.45%     1.56%*      .93%     .94%     1.04%*
                          =======  =======    ======    =======  =======    ======
Investment income --
  net...................     4.63%    4.61%     4.68%*     5.13%    5.12%     5.22%*
                          =======  =======    ======    =======  =======    ======
SUPPLEMENTAL DATA:
Net assets, end of
 period (in thousands)..  $ 1,495  $ 1,185    $  432    $ 1,602  $ 1,290    $  750
                          =======  =======    ======    =======  =======    ======
Portfolio turnover......    24.64%   56.05%    89.62%     24.64%   56.05%    89.62%
                          =======  =======    ======    =======  =======    ======
</TABLE>    
- --------
 + Commencement of Operations.
 * Annualized.
** Total investment returns exclude the effects of sales loads.
# Aggregate total investment return.
 
                                       10
<PAGE>
 
                       INVESTMENT OBJECTIVE AND POLICIES
   
  The investment objective of the Fund is to provide shareholders with as high
a level of income exempt from Federal and Massachusetts income taxes as is
consistent with prudent investment management. The Fund seeks to achieve its
objective while providing investors with the opportunity to invest in a
portfolio of securities consisting primarily of long-term obligations issued by
or on behalf of The Commonwealth of Massachusetts, its political subdivisions,
agencies and instrumentalities and obligations of other qualifying issuers,
such as issuers located in Puerto Rico, the U.S. Virgin Islands and Guam, which
pay interest exempt, in the opinion of bond counsel to the issuer, from Federal
and Massachusetts income taxes. Obligations bearing interest exempt from
Federal income taxes are referred to herein as "Municipal Bonds" and
obligations the interest on which is exempt from both Federal and Massachusetts
income taxes are referred to as "Massachusetts Municipal Bonds." Unless
otherwise indicated, reference to Municipal Bonds shall be deemed to include
Massachusetts Municipal Bonds. The Fund at all times, except during temporary
defensive periods, will maintain at least 65% of its total assets invested in
Massachusetts Municipal Bonds. The investment objective of the Fund as set
forth in the first sentence of this paragraph is a fundamental policy and may
not be changed without shareholder approval. At times, the Fund may seek to
hedge its portfolio through the use of futures transactions to reduce
volatility in the net asset value of Fund shares.     
   
  Municipal Bonds may include several types of bonds. The Fund may also invest
in variable rate demand obligations ("VRDOs"). The interest on Municipal Bonds
may bear a fixed rate or be payable at a variable or floating rate. At least
80% of the Municipal Bonds purchased by the Fund primarily will be what are
commonly referred to as "investment grade" securities, which are obligations
rated at the time of purchase within the four highest quality ratings as
determined by either Moody's Investors Service, Inc. ("Moody's") (currently
Aaa, Aa, A and Baa), Standard & Poor's Ratings Services ("Standard & Poor's")
(currently AAA, AA, A and BBB) or Fitch Investors Service, Inc. ("Fitch")
(currently AAA, AA, A and BBB). If Municipal Bonds are unrated, such securities
will possess creditworthiness comparable, in the opinion of the Manager, to
obligations in which the Fund may invest. Bonds rated in the fourth highest
rating category, while considered "investment grade," have certain speculative
characteristics and are more likely to be downgraded to non-investment grade
than obligations rated in one of the top three rating categories. See Appendix
II--"Ratings of Municipal Bonds" in the Statement of Additional Information for
more information regarding ratings of debt securities. An issue of rated
Massachusetts Municipal Bonds may cease to be rated or its rating may be
reduced below "investment grade" subsequent to its purchase by the Fund. If an
obligation is downgraded below investment grade, the Manager will consider
factors such as price, credit risk, market conditions, financial condition of
the issuer and interest rates to determine whether to continue to hold the
obligation in the Fund's portfolio.     
   
  The Fund may invest up to 20% of its total assets in Municipal Bonds that are
rated below Baa by Moody's or below BBB by Standard & Poor's or Fitch, or which
in the Manager's judgment, possess similar credit characteristics. Such
securities, sometimes referred to as "high yield" or "junk" bonds, are
predominantly speculative with respect to the capacity to pay interest and
repay principal in accordance with the terms of the security and generally
involve a greater volatility of price than securities in higher rating
categories. The market prices of high-yielding, lower-rated securities may
fluctuate more than higher-rated securities and may decline significantly in
periods of general economic difficulty, which may follow periods of rising
interest rates. In purchasing such securities, the Fund will rely on the
Manager's judgment, analysis and experience in evaluating the creditworthiness
of the issuer of such securities. The Manager will take into     
 
                                       11
<PAGE>
 
consideration, among other things, the issuer's financial resources, its
sensitivity to economic conditions and trends, its operating history, the
quality of its management and regulatory matters. See "Investment Objective and
Policies" in the Statement of Additional Information for a more detailed
discussion of the pertinent risk factors involved in investing in "high yield"
or "junk" bonds and Appendix II--"Ratings of Municipal Bonds" in the Statement
of Additional Information for additional information regarding ratings of debt
securities. The Fund does not intend to purchase debt securities that are in
default or which the Manager believes will be in default.
 
  Certain Municipal Bonds may be entitled to the benefits of letters of credit
or similar credit enhancements issued by financial institutions. In such
instances, the Trustees and the Manager will take into account in assessing the
quality of such bonds not only the creditworthiness of the issuer of such bonds
but also the creditworthiness of the financial institution.
 
  The Fund's investments may also include VRDOs and VRDOs in the form of
participation interests ("Participating VRDOs") in variable rate tax-exempt
obligations held by a financial institution. The VRDOs in which the Fund will
invest are tax-exempt obligations which 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%) of the
underlying obligation and the right to demand payment of the unpaid principal
balance plus accrued interest on the Participating VRDOs from the financial
institution on a specified number of days' notice, not to exceed seven days.
There is, however, the possibility that because of a 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.
 
  VRDOs that contain an unconditional right of demand to receive payment of the
unpaid principal balance plus accrued interest on a notice period exceeding
seven days may be deemed illiquid securities. A VRDO with a demand notice
period exceeding seven days will therefore be subject to the Fund's restriction
on illiquid investments unless, in the judgment of the Trustees, such VRDO is
liquid. The Trustees may adopt guidelines and delegate to the Manager the daily
function of determining and monitoring liquidity of such VRDOs. The Trustees,
however, will retain sufficient oversight and be ultimately responsible for
such determinations.
   
  The Fund ordinarily does not intend to realize investment income not exempt
from Federal and Massachusetts income taxes. However, to the extent that
suitable Massachusetts Municipal Bonds are not available for investment by the
Fund, the Fund may purchase Municipal Bonds issued by other states, their
agencies and instrumentalities, the interest income on which is exempt, in the
opinion of bond counsel, from Federal income tax, but not Massachusetts
personal income taxation. The Fund may also 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 to be 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 Investment Company Act of 1940, as amended (the "1940 Act").
Other Non-Municipal Tax-Exempt Securities could include trust certificates or
other instruments evidencing interests in one or more long-term municipal
securities.     
 
                                       12
<PAGE>
 
   
  Under normal circumstances, except when acceptable securities are unavailable
as determined by the Manager, the Fund will invest at least 65% of its total
assets in Massachusetts Municipal Bonds. For temporary defensive periods or to
provide liquidity, the Fund has the authority to invest as much as 35% of its
total assets in tax-exempt or taxable money market obligations with a maturity
of one year or less (such short-term obligations being referred to herein as
"Temporary Investments"), except that taxable Temporary Investments shall not
exceed 20% of the Fund's net assets. The Temporary Investments, VRDOs and
Participating VRDOs in which the Fund may invest also will be in the following
rating categories at the time of purchase: MIG-1/VMIG-1 through MIG-4/VMIG-4
for notes and VRDOs and Prime-1 through Prime-3 for commercial paper (as
determined by Moody's), SP-1 or SP-2 for notes and A-1 through A-3 for VRDOs
and commercial paper (as determined by Standard & Poor's), or F-1 through F-3
for notes, VRDOs and commercial paper (as determined by Fitch) or, if unrated,
of comparable quality in the opinion of the Manager. The Fund at all times will
have at least 80% of its net assets invested in securities the interest on
which is exempt from Federal taxation. However, interest received on certain
otherwise tax-exempt securities which are classified as "private activity
bonds" (in general, bonds that benefit non-governmental entities), may be
subject to a Federal alternative minimum tax. The percentage of the Fund's net
assets invested in "private activity bonds" will vary during the year. See
"Distributions and Taxes." In addition, the Fund reserves the right to invest
temporarily a greater portion of its assets in Temporary Investments for
defensive purposes, when, in the judgment of the Manager, market conditions
warrant. The Fund's hedging strategies, which are described in more detail
under "Financial Futures Transactions and Options," are not fundamental
policies and may be modified by the Trustees of the Trust without the approval
of the Fund's shareholders.     
 
POTENTIAL BENEFITS
   
  Investment in shares of the Fund offers several benefits. The Fund offers
investors the opportunity to receive income exempt from Federal income taxes
and Massachusetts personal income taxes by investing in a professionally
managed portfolio consisting primarily of long-term Massachusetts Municipal
Bonds. The Fund also provides liquidity because of its redemption features and
relieves the investor of the burdensome administrative details involved in
managing a portfolio of tax-exempt securities. The benefits of investing in the
Fund are at least partially offset by the expenses involved in operating an
investment company. Such expenses primarily consist of the management fee and
operational costs, and in the case of certain classes of shares, the account
maintenance and distribution costs.     
 
SPECIAL AND RISK CONSIDERATIONS RELATING TO MUNICIPAL BONDS
   
  The risks and special considerations involved in investments in Municipal
Bonds vary with the types of instruments being acquired. Investments in Non-
Municipal Tax-Exempt Securities may present similar risks, depending on the
particular product. Certain instruments in which the Fund may invest may be
characterized as derivative instruments. See "Description of Municipal Bonds"
and "Financial Futures Transactions and Options."     
 
  Moreover, the Fund ordinarily will invest at least 65% of its total assets in
Massachusetts Municipal Bonds, and therefore it is more susceptible to factors
adversely affecting issuers of Massachusetts Municipal Bonds than is a
municipal bond mutual fund that is not concentrated in issuers of Massachusetts
Municipal Bonds to this degree. The Commonwealth of Massachusetts is
experiencing a moderate economic recovery. The budgeted operating funds of
Massachusetts ended fiscal 1993 with a surplus of revenues and other sources
 
                                       13
<PAGE>
 
   
over expenditures and other uses, and with aggregate ending fund balances of
approximately $562.5 million. Massachusetts ended fiscal 1994, 1995 and 1996
with positive closing fund balances of $589.3 million, $726.0 million and
$1.172 billion, respectively. As of August 6, 1997 and according to the
Executive Office for Administration and Finance, fiscal 1997 is expected to end
with positive budgetary fund balances totaling approximately $1.194 billion.
Currently, Massachusetts' general obligation bonds are rated by Standard &
Poor's, Fitch and Moody's as A+, A+ and A-1, respectively. From time to time,
the rating agencies may further change their ratings in response to budgetary
matters or other economic indicators.     
   
  The value of Municipal Bonds generally may be affected by uncertainties in
the municipal markets as a result of legislation or litigation changing the
taxation of Municipal Bonds or the rights of Municipal Bond holders in the
event of bankruptcy. Municipal bankruptcies are rare, and certain provisions of
the U.S. Bankruptcy Code governing such bankruptcies are unclear. Further, the
application of state law to Municipal Bond issuers could produce varying
results among the states or among Municipal Bond Issuers within a state. These
uncertainties could have a significant impact on the prices of the
Massachusetts Municipal Bonds or Municipal Bonds in which the Fund invests.
       
  The Manager does not believe that the current economic conditions in
Massachusetts or other factors described above will have a significant adverse
effect on the Fund's ability to invest in high quality Massachusetts Municipal
Bonds. Because the Fund's portfolio will be comprised primarily of investment
grade securities, the Fund is expected to be less subject to market and credit
risks than a fund that invests primarily in lower quality Massachusetts
Municipal Bonds. See "Description of Municipal Bonds" in the Statement of
Additional Information and see also Appendix I--"Economic and Financial
Conditions in Massachusetts" in the Statement of Additional Information.     
 
DESCRIPTION OF MUNICIPAL BONDS
 
  Municipal Bonds include debt obligations issued to obtain funds for various
public purposes, including construction and equipping of a wide range of public
facilities (including water, sewer, gas, electricity, solid waste, health care,
transportation, education and housing 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 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 or sewage or solid waste disposal. For purposes of this Prospectus,
such obligations are referred to as Municipal Bonds if the interest paid
thereon is excluded from gross income for purposes of Federal income taxation
and, as Massachusetts Municipal Bonds if the interest thereon is exempt from
Federal income tax and exempt from Massachusetts personal income tax, even
though such bonds may be "private activity bonds" as discussed below.
 
  The two principal classifications of Municipal Bonds are "general obligation"
bonds and "revenue" bonds which latter category includes industrial development
bonds ("IDBs") and, for bonds issued after August 15, 1986, private activity
bonds. General obligation bonds are secured by the issuer's pledge of its
faith, credit and taxing power for the payment of principal and interest. The
taxing power of any governmental entity may be limited, however, by provisions
of its state constitution or laws, and an entity's creditworthiness will depend
on many factors, including potential erosion of 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
 
                                       14
<PAGE>
 
   
to limit ad valorem real property taxes and the extent to which the entity
relies on Federal or state aid, access to capital markets or other factors
beyond the state's or entity's control. Accordingly, the capacity of the issuer
of a general obligation bond as to the timely payment of interest and the
repayment of principal when due is affected by the issuer's maintenance of its
tax base.     
 
  Revenue bonds are payable only from the revenues derived from a particular
facility or class of facilities or, in some cases, from the proceeds of a
special excise tax or other specific revenue source such as payments from the
user of the facility being financed; accordingly, the timely payment of
interest and the repayment of
   
principal in accordance with the terms of the revenue or special obligation
bond is a function of the economic viability of such facility or such revenue
source.     
   
  The Fund may purchase IDBs and private activity bonds. IDBs and private
activity bonds are, in most cases, tax-exempt securities issued by states,
municipalities or public authorities to provide funds, usually through a loan
or lease arrangement, to a private entity for the purpose of financing
construction or improvement of a facility to be used by the entity. Such bonds
are secured primarily by revenues derived from loan repayments or lease
payments due from the entity which may or may not be guaranteed by a parent
company or otherwise secured. IDBs and private activity bonds are generally not
secured by a pledge of the taxing power of the issuer of such bonds. Therefore,
an investor should be aware that repayment of such bonds generally depends on
the revenues of a private entity and be aware of the risks that such an
investment may entail. Continued ability of an entity to generate sufficient
revenues for the payment of principal and interest on such bonds will be
affected by many factors including the size of the entity, capital structure,
demand for its products or services, competition, general economic conditions,
governmental regulation and the entity's dependence on revenues for the
operation of the particular facility being financed. The Fund may also invest
in so-called "moral obligation" bonds, which are normally issued by special
purpose authorities. If an issuer of moral obligation bonds is unable to meet
its obligations, repayment of such bonds becomes a moral commitment, but not a
legal obligation of the state or municipality in question.     
   
  The Fund may invest in Municipal Bonds (and Non-Municipal Tax-Exempt
Securities) the return on which is 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 or based on the
value of gold or some other commodity. 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. Interest and principal payable on the Municipal
Bonds may also be based on relative changes among particular indices. Also, the
Fund may invest in so-called "inverse floating obligations" or "residual
interest bonds" on which the interest rates typically decline as short-term
market rates increase and increase as short-term market rates decline. The
Fund's return on such types of Municipal Bonds (and Non-Municipal Tax-Exempt
Securities) will be subject to risk with respect to the value of the particular
index, which may include reduced or eliminated interest payments and losses of
invested principal. Such securities have the effect of providing a degree of
investment leverage, since they may increase or decrease in value in response
to changes, as an illustration, in market interest rates at a rate which is a
multiple (typically two) of the rate at which fixed-rate long-term tax-exempt
securities increase or decrease in response to such changes. As a result, the
market values of such securities will generally be more volatile than the
market values of fixed-rate tax-exempt     
 
                                       15
<PAGE>
 
securities. To seek to limit the volatility of these securities, the Fund may
purchase inverse floating obligations with shorter-term maturities or which
contain limitations on the extent to which the interest rate may vary. Certain
investments in such obligations may be illiquid. The Fund may not invest in
such illiquid obligations if such investments, together with other illiquid
investments, would exceed 15% of the Fund's total assets. The Manager believes,
however, that indexed and inverse floating obligations represent flexible
portfolio management instruments for the Fund which allow the Fund to seek
potential investment rewards, hedge other portfolio positions or vary the
degree of investment leverage relatively efficiently under different market
conditions.
   
  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 called
"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 is
frequently 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 type of financing that has not yet developed the
depth of marketability associated with more conventional securities. Certain
investments in lease obligations may be illiquid. The Fund may not invest in
illiquid lease obligations if such investments, together with other illiquid
investments, would exceed 15% of the Fund's total assets. The Fund may,
however, invest without regard to such limitation in lease obligations which
the Manager, pursuant to guidelines which have been adopted by the Board of
Trustees and subject to the supervision of the Board, determines to be liquid.
The Manager will deem lease obligations liquid if they are publicly offered and
have received an investment grade rating of Baa or better by Moody's, or BBB or
better by Standard & Poor's or Fitch. Unrated lease obligations, or those rated
below investment grade, will be considered liquid if the obligations come to
the market through an underwritten public offering and at least two dealers are
willing to give competitive bids. In reference to obligations rated below
investment grade, the Manager must, among other things, also review the
creditworthiness of the municipality obligated to make payment under the lease
obligation and make certain specified determinations based on such factors as
the existence of a rating or credit enhancement such as insurance, the
frequency of trades or quotes for the obligation and the willingness of dealers
to make a market in the obligation.     
 
  The value of bonds and other fixed-income obligations may fall when interest
rates rise and rise when interest rates fall. In general, bonds and other
fixed-income obligations with longer maturities will be subject to greater
volatility resulting from interest rate fluctuations than will similar
obligations with shorter maturities. Under normal conditions, it is generally
anticipated that the Fund's average weighted maturity would be in excess of ten
years.
 
  Federal tax legislation has limited the types and volume of bonds the
interest on which qualifies for a Federal income tax exemption. As a result,
this legislation and legislation which may be enacted in the future may affect
the availability of Municipal Bonds for investment by the Fund.
 
                                       16
<PAGE>
 
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 that
of holding a Municipal Bond as a non-callable security. Certain investments in
such obligations may be illiquid. The Fund may not invest in such illiquid
obligations if such investments, together with other illiquid investments,
would exceed 15% of the Fund's total assets.
 
WHEN-ISSUED SECURITIES AND DELAYED DELIVERY TRANSACTIONS
 
  The Fund may purchase or sell Municipal Bonds on a delayed delivery basis or
a when-issued basis at fixed purchase 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 securities having a market value at all
times at least equal to the amount of the forward commitment.
 
FINANCIAL FUTURES TRANSACTIONS AND OPTIONS
   
  The Fund is authorized to purchase and sell certain exchange traded financial
futures contracts ("financial futures contracts") solely for the purpose of
hedging its investments in Municipal Bonds against declines in value and to
hedge against increases in the cost of securities it intends to purchase.
However, any transactions involving financial futures or options (including
puts and calls associated therewith) will be in accordance with the Fund's
investment policies and limitations. A financial futures contract obligates the
seller of a contract to deliver and the purchaser of a contract to take
delivery of the type of financial instrument covered by the contract, or in the
case of index-based futures contracts to make and accept a cash settlement, at
a specific future time for a specified price. A sale of financial futures
contracts may provide a hedge against a decline in the value of portfolio
securities because such depreciation may be offset, in whole or in part, by an
increase in the value of the position in the financial futures contracts. A
purchase of financial futures contracts may provide a hedge against an increase
in the cost of securities intended to be purchased, because such appreciation
may be offset, in whole or in part, by an increase in the value of the position
in the futures contracts. Distributions, if any, of net long-term capital gains
from certain transactions in futures or options are taxable at long-term
capital gains rates for Federal income tax purposes, regardless of the length
of time the shareholder has owned Fund shares. Recent legislation has created
new categories of capital gains taxable at different rates, which the Fund may
be able to pass through to shareholders. See "Distributions and Taxes--Taxes."
    
  The Fund deals in financial futures contracts traded on the Chicago Board of
Trade based on The Bond Buyer Municipal Bond Index, a price-weighted measure of
the market value of 40 large, recently issued tax-exempt bonds. There can be no
assurance, however, that a liquid secondary market will exist to terminate any
particular financial futures contract at any specific time. If it is not
possible to close a financial futures
 
                                       17
<PAGE>
 
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 inability to close financial
futures positions also could have an adverse impact on the Fund's ability to
hedge effectively. There is also the risk of loss by the Fund of margin
deposits in the event of bankruptcy of a broker with whom the Fund has an open
position in a financial futures contract.
 
  The Fund may purchase and sell financial futures contracts on U.S.
Government securities and write and purchase put and call options on such
futures contracts as a hedge against adverse changes in interest rates as
described more fully in the Statement of Additional Information. With respect
to U.S. Government securities, currently there are financial futures contracts
based on long-term U.S. Treasury bonds, Treasury notes, Government National
Mortgage Association ("GNMA") Certificates and three-month U.S. Treasury
bills.
 
  Subject to policies adopted by the Trustees, the Fund also may engage in
other financial futures contracts transactions and options thereon, such as
financial futures contracts or options on other municipal bond indexes which
may become available if the Manager of the Fund and the Trustees of the Trust
should determine that there is normally a sufficient correlation between the
prices of such futures contracts and the Municipal Bonds in which the Fund
invests to make such hedging appropriate.
 
  Utilization of futures transactions and options thereon involves the risk of
imperfect correlation in movements in the price of futures contracts and
movements in the price of the security which is the subject of the hedge. If
the price of the 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 which will not be completely offset by movements in the price of such
security. There is a risk of imperfect correlation where the securities
underlying futures contracts have different maturities, ratings or geographic
mixes than the security being hedged. In addition, the correlation may be
affected by additions to or deletions from the index which 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
which have a disparate impact on the respective markets for such securities.
 
  Under regulations of the Commodity Futures Trading Commission ("CFTC"), the
futures trading activities described herein will not result in the Fund being
deemed to be a "commodity pool", as defined under such regulations, provided
that the Fund adheres to certain restrictions. In particular, the Fund may
purchase and sell futures contracts and options thereon (i) for bona fide
hedging purposes, and (ii) for non-hedging purposes, if the aggregate initial
margins and premiums required to establish positions in such contracts and
options does not exceed 5% of the liquidation value of the Fund's portfolio
assets after taking into account unrealized profits and unrealized losses on
any such contracts and options. (However, as stated above, the Fund intends to
engage in options and futures transactions only for hedging purposes.) Margin
deposits may consist of cash or securities acceptable to the broker and the
relevant contract market.
 
  When the Fund purchases a futures contract, or writes a put option or
purchases a call option thereon, it will maintain an amount of cash, cash
equivalents (e.g., high grade commercial paper and daily tender
 
                                      18
<PAGE>
 
adjustable notes) or liquid securities in a segregated account with the Fund's
custodian, so that the amount so segregated plus the amount of initial and
variation margin held in the account of its broker equals the market value of
the futures contracts, thereby ensuring that the use of such futures contract
is unleveraged. It is not anticipated that transactions in futures contracts
will have the effect of increasing portfolio turnover.
   
  Although certain risks are involved in options and futures transactions, the
Manager believes that, because the Fund will engage in futures transactions
only for hedging purposes, the futures portfolio strategies of the Fund will
not subject the Fund to certain risks frequently associated with speculation in
futures transactions. The Fund must meet certain Federal income tax
requirements under the Internal Revenue Code of 1986, as amended (the "Code"),
in order to qualify for the special tax treatment afforded regulated investment
companies, including a requirement that less than 30% of its gross income be
derived from the sale or other disposition of securities held for less than
three months. This requirement will no longer apply to the Fund after its
fiscal year ending July 31, 1998. Additionally, the Fund is required to meet
certain diversification requirements under the Code.     
 
  The liquidity of a secondary market in a futures contract may be adversely
affected by "daily price fluctuation limits" established by commodity exchanges
which limit the amount of fluctuation in a futures contract price during a
single trading day. Once the daily limit has been reached in the contract, no
trades may be entered into at a price beyond the limit, thus preventing the
liquidation of open futures positions. Prices have in the past moved beyond the
daily limit on a number of consecutive trading days.
 
  The successful use of transactions in futures also depends on the ability of
the Manager to forecast correctly the direction and extent of interest rate
movements within a given time frame. To the extent these rates remain stable
during the period in which a futures contract is held by the Fund or moves in a
direction opposite to that anticipated, the Fund may realize a loss on the
hedging transaction which is not fully or partially offset by an increase in
the value of portfolio securities. As a result, the Fund's total return for
such period may be less than if it had not engaged in the hedging transaction.
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.
 
  Reference is made to the Statement of Additional Information for further
information on financial futures contracts and certain options thereon.
 
REPURCHASE AGREEMENTS
 
  As Temporary Investments, the Fund may invest in securities pursuant to
repurchase agreements. Repurchase agreements may be entered into only with a
member bank of the Federal Reserve System or a primary dealer in U.S.
Government securities or an affiliate thereof. Under such agreements, the
seller agrees, upon entering into the contract, to repurchase the security from
the Fund 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
in repurchase agreements maturing in more than seven days if such investments,
together with the Fund's other illiquid investments, would exceed 15% of the
Fund's total assets. In the event of a default by the seller under a repurchase
agreement, the Fund may suffer time delays and incur costs or possible losses
in connection with the disposition of the underlying securities.
 
                                       19
<PAGE>
 
INVESTMENT RESTRICTIONS
 
  The Fund's investment activities are subject to further restrictions that are
described in the Statement of Additional Information. Investment restrictions
and policies which are fundamental policies may not be changed without the
approval of the holders of a majority of the Fund's outstanding voting
securities, as defined in the 1940 Act which means the lesser of (i) 67% of the
shares represented at a meeting at which more than 50% of the outstanding
shares are represented or (ii) more than 50% of the outstanding shares. Among
its fundamental policies, the Fund may not invest more than 25% of its assets,
taken at market value at the time of each investment, in the securities of
issuers in any particular industry (excluding the U.S. Government and its
agencies and instrumentalities) (For purposes of this restriction, states,
municipalities and their political subdivisions are not considered to be part
of any industry). Investment restrictions and policies that are non-fundamental
policies may be changed by the Board of Trustees without shareholder approval.
As a non-fundamental policy, the Fund may not borrow amounts in excess of 20%
of its total assets taken at market value (including the amount borrowed), and
then only from banks as a temporary measure for extraordinary or emergency
purposes. In addition, the Fund will not purchase securities while borrowings
are outstanding.
   
  As a non-fundamental policy, the Fund will not invest in securities which
cannot be readily resold because of legal or contractual restrictions or which
cannot otherwise be marketed, redeemed or put to the issuer or a third party,
if at the time of acquisition more than 15% of its total assets would be
invested in such securities. This restriction shall not apply to securities
which mature within seven days or securities which the Board of Trustees of the
Trust has otherwise determined to be liquid pursuant to applicable law.     
   
  The Fund is classified as non-diversified within the meaning of the 1940 Act,
which means that the Fund is not limited by the 1940 Act in the proportion of
its assets that it may invest in obligations of a single issuer. However, the
Fund's investments will be limited so as to qualify as a "regulated investment
company" for purposes of the Code. See "Distributions and Taxes--Taxes." To
qualify, among other requirements, the Trust will limit the Fund's investments
so that, at the close of each quarter of the taxable year, (i) not more than
25% of the market value of the Fund's total assets will be invested in the
securities of a single issuer, and (ii) with respect to 50% of the market value
of its total assets, not more than 5% of the market value of its total assets
will be invested in the securities of a single issuer and the Fund will not own
more than 10% of the outstanding voting securities of a single issuer. For
purposes of this restriction, the Fund will regard each state and each
political subdivision, agency or instrumentality of such state and each multi-
state agency of which such state is a member and each public authority which
issues securities on behalf of a private entity as a separate issuer, except
that if the security is backed only by the assets and revenues of a non-
government entity then the entity with the ultimate responsibility for the
payment of interest and principal may be regarded as the sole issuer. These
tax-related limitations may be changed by the Trustees of the Trust to the
extent necessary to comply with changes to the Federal tax requirements. A fund
which elects to be classified as "diversified" under the 1940 Act must satisfy
the foregoing 5% and 10% requirements with respect to 75% of its total assets.
To the extent that the Fund assumes large positions in the obligations of a
small number of issuers, the Fund's total return 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.     
 
  Investors are referred to the Statement of Additional Information for a
complete description of the Fund's investment restrictions.
 
                                       20
<PAGE>
 
                            MANAGEMENT OF THE TRUST
 
TRUSTEES
 
  The Trustees of the Trust consist of six individuals, five of whom are not
"interested persons" of the Trust as defined in the 1940 Act. The Trustees are
responsible for the overall supervision of the operations of the Trust and the
Fund and perform the various duties imposed on the directors or trustees of
investment companies by the 1940 Act.
 
  The Trustees are:
   
  Arthur Zeikel*--President of the Manager and its affiliate, MLAM; President
and Director of Princeton Services, Inc. ("Princeton Services"); and Executive
Vice President of ML & Co.     
 
  James H. Bodurtha--Director and Executive Vice President, The China Business
Group, Inc.
 
  Herbert I. London--John M. Olin Professor of Humanities, New York University.
 
  Robert R. Martin--Former Chairman, Kinnard Investments, Inc.
 
  Joseph L. May--Attorney in private practice.
 
  Andre F. Perold--Professor, Harvard Business School.
- --------
 * Interested person, as defined in the 1940 Act, of the Trust.
 
MANAGEMENT AND ADVISORY ARRANGEMENTS
   
  The Manager, which is an affiliate of MLAM and is owned and controlled by ML
& Co., a financial services holding company, acts as the manager for the Fund
and provides the Fund with management services. The Manager or MLAM acts as the
investment adviser for more than 140 registered investment companies. MLAM also
offers portfolio management and portfolio analysis services to individuals and
institutions. As of September 30, 1997, the Manager and MLAM had a total of
approximately $272.5 billion in investment company and other portfolio assets
under management, including accounts of certain affiliates of the Manager.     
 
  Subject to the direction of the Trustees, the Manager is responsible for the
actual management of the Fund's portfolio and constantly reviews the Fund's
holdings in light of its own research analysis and that from other relevant
sources. The responsibility for making decisions to buy, sell or hold a
particular security rests with the Manager. The Manager performs certain of the
other administrative services and provides all the office space, facilities,
equipment and necessary personnel for management of the Fund.
   
  Theodore R. Jaeckel, Jr. is the Portfolio Manager of the Fund and is
responsible for the day-to-day management of the Fund's investment portfolio.
He has been a Director (Municipal Tax-Exempt Fund Management) of MLAM since
1997 and was a Vice President thereof from 1991 to 1997.     
          
  Pursuant to the management agreement between the Manager and the Trust on
behalf of the Fund (the "Management Agreement"), the Manager is entitled to
receive from the Fund a monthly fee based upon the average daily net assets of
the Fund at the following annual rates: 0.55% of the average daily net assets
not exceeding $500 million; 0.525% of the average daily net assets exceeding
$500 million but not exceeding $1.0 billion; and 0.50% of the average daily net
assets exceeding $1.0 billion. For the fiscal year ended July 31, 1997, the
total fee paid by the Fund to the Manager was $355,290 (based on average daily
net assets of approximately $64.6 million).     
 
                                       21
<PAGE>
 
   
  The Management Agreement obligates the Trust on behalf of the Fund to pay
certain expenses incurred in the Fund's operations, including, among other
things, the management fee, legal and audit fees, unaffiliated Trustees' fees
and expenses, registration fees, custodian and transfer agency fees, accounting
and pricing costs, and certain of the costs of printing proxies, shareholder
reports, prospectuses and statements of additional information. Accounting
services are provided to the Fund by the Manager, and the Fund reimburses the
Manager for its costs in connection with such services. For the fiscal year
ended July 31, 1997, the Fund reimbursed the Manager $40,593 for accounting
services. For the fiscal year ended July 31, 1997, the ratio of total expenses
to average net assets was 0.83% for Class A shares, 1.34% for Class B shares,
1.43% for Class C shares and 0.93% for Class D shares.     
 
CODE OF ETHICS
 
  The Board of Trustees of the Trust has adopted a Code of Ethics under Rule
17j-1 of the 1940 Act which incorporates the Code of Ethics of the Manager
(together, the "Codes"). The Codes significantly restrict the personal
investing activities of all employees of the Manager and, as described below,
impose additional, more onerous, restrictions on fund investment personnel.
   
  The Codes require that all employees of the Manager 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
Manager include a ban on acquiring any securities in a "hot" initial public
offering and a prohibition from profiting on short-term trading in securities.
In addition, no employee may purchase or sell any security that at the time is
being purchased or sold (as the case may be), or to the knowledge of the
employee is being considered for purchase or sale, by any fund advised by the
Manager. Furthermore, the Codes provide for trading "blackout periods" which
prohibit trading by investment personnel of the Fund within periods of trading
by the Fund in the same (or equivalent) security (15 or 30 days depending upon
the transaction).     
 
TRANSFER AGENCY SERVICES
   
  The Transfer Agent which is a subsidiary of ML & Co., acts as the Trust's
transfer agent pursuant to a Transfer Agency, Dividend Disbursing Agency and
Shareholder Servicing Agency Agreement (the "Transfer Agency Agreement").
Pursuant to the Transfer Agency Agreement, the Transfer Agent is responsible
for the issuance, transfer and redemption of shares and the opening and
maintenance of shareholder accounts. Pursuant to the Transfer Agency Agreement
the Transfer Agent receives an annual fee of up to $11.00 per Class A or Class
D account and up to $14.00 per Class B or Class C account, and is entitled to
reimbursement for certain transaction charges and out-of-pocket expenses
incurred by the Transfer Agent under the Transfer Agency Agreement.
Additionally, a $.20 monthly closed account charge will be assessed on all
accounts which close during the calendar year. Application of this fee will
commence the month following the month the account is closed. At the end of the
calendar year, no further fees will be due. For purposes of the Transfer Agency
Agreement, the term "account" includes a shareholder account maintained
directly by the Transfer Agent and any other account representing the
beneficial interest of a person in the relevant share class on a recordkeeping
system, provided the recordkeeping system is maintained by a subsidiary of ML &
Co. For the fiscal year ended July 31, 1997, the total fee paid by the Fund to
the Transfer Agent was $33,633 pursuant to the Transfer Agency Agreement.     
 
                                       22
<PAGE>
 
       
                              PURCHASE OF SHARES
   
  The Distributor, an affiliate of each of the Manager, MLAM and Merrill
Lynch, acts as the distributor of the shares of the Fund. Shares of the Fund
are offered continuously for sale by the Distributor and other eligible
securities dealers (including Merrill Lynch). Shares of the Fund may be
purchased from securities dealers 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, except that for participants in certain fee-based
programs, the minimum initial purchase is $500 and the minimum subsequent
purchase is $50.     
   
  The Fund offers its shares in four classes at a public offering price equal
to the next determined net asset value per share plus sales charges imposed
either at the time of purchase or on a deferred basis depending upon the class
of shares selected by the investor under the Merrill Lynch Select Pricing SM
System, as described below. The applicable offering price for purchase orders
is based upon the net asset value of the Fund next determined after receipt of
the purchase orders by the Distributor. As to purchase orders received by
securities dealers prior to the close of business on the New York Stock
Exchange (the "NYSE") (generally, 4:00 p.m., New York time), which includes
orders received after the close of business on the previous day, the
applicable offering price will be 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 on that day, such orders shall be deemed
received on the next business day. The Trust or the Distributor may suspend
the continuous offering of the Fund's shares of any class at any time in
response to conditions in the securities markets or otherwise and may
thereafter resume such offering from time to time. Any order may be rejected
by the Distributor or the Trust. Neither the Distributor nor the dealers are
permitted to withhold placing orders to benefit themselves by a price change.
Merrill Lynch may charge its customers a processing fee (presently $5.35) to
confirm a sale of shares to such customers. Purchases made directly through
the Fund's Transfer Agent are not subject to the processing fee.     
 
  The Fund issues four classes of shares under the Merrill Lynch Select
Pricing SM System, which permits each investor to choose the method of
purchasing shares that the investor believes is most beneficial given the
amount of the purchase, the length of time the investor expects to hold the
shares and other relevant circumstances. Shares of Class A and Class D are
sold to investors choosing the initial sales charge alternatives and shares of
Class B and Class C are sold to investors choosing the deferred sales charge
alternatives. Investors should determine whether under their particular
circumstances it is more advantageous to incur an initial sales charge or to
have the entire initial purchase price invested in the Fund with the
investment thereafter being subject to a CDSC and ongoing distribution fees
and higher account maintenance fees. A discussion of the factors that
investors should consider in determining the method of purchasing shares under
the Merrill Lynch Select Pricing SM System is set forth under "Merrill Lynch
Select Pricing SM System" on page 4.
 
  Each Class A, Class B, Class C and Class D share of the Fund represents
identical interests in the investment portfolio of the Fund and has the same
rights, except that Class B, Class C and Class D shares bear the expenses of
the ongoing account maintenance fees, and Class B and Class C shares bear the
expenses of the ongoing distribution fees and the additional incremental
transfer agency costs resulting from the deferred sales charge arrangements.
The CDSCs, distribution and account maintenance fees that are imposed on Class
B and Class C shares, as well as the account maintenance fees that are imposed
on Class D shares,
 
                                      23
<PAGE>
 
   
will be imposed directly against those classes and not against all assets of
the Fund and, accordingly, such charges will not affect the net asset value of
any other class or have any impact on investors choosing another sales charge
option. Dividends paid by the Fund for each class of shares will be calculated
in the same manner at the same time and will differ only to the extent that
account maintenance and distribution fees and any incremental transfer agency
costs relating to a particular class are borne exclusively by that class.
Class B, Class C and Class D shares each have exclusive voting rights with
respect to the Rule 12b-1 distribution plan adopted with respect to such class
pursuant to which account maintenance and/or distribution fees are paid
(except that Class B shareholders may vote upon any material changes to
expenses charged under the Class D Distribution Plan). See "Distribution
Plans" below. Each class has different exchange privileges. See "Shareholder
Services--Exchange Privilege."     
   
  Investors should understand that the purpose and function of the initial
sales charges with respect to Class A and Class D shares are the same as those
of the CDSCs and distribution fees with respect to Class B and Class C shares
in that the sales charges and distribution fees applicable to each class
provide for the financing of the distribution of the shares of the Fund. The
distribution-related revenues paid with respect to a class will not be used to
finance the distribution expenditures of another class. Sales personnel may
receive different compensation for selling different classes of shares.
Investors are advised that only Class A and Class D shares may be available
for purchase through securities dealers, other than Merrill Lynch, that are
eligible to sell shares.     
 
  The following table sets forth a summary of the distribution arrangements
for each class of shares under the Merrill Lynch Select Pricing SM System,
followed by a more detailed description of each class.
 
 
 
<TABLE>   
<CAPTION>
                                             ACCOUNT
                                           MAINTENANCE DISTRIBUTION       CONVERSION
  CLASS          SALES CHARGE(/1/)             FEE         FEE             FEATURE
- ------------------------------------------------------------------------------------------
  <S>     <C>                              <C>         <C>          <C>
    A        Maximum 4.0% initial sales        No           No                No
                  charge(/2/)(/3/)
- ------------------------------------------------------------------------------------------
    B     CDSC for a period of four years,    0.25%        0.25%     B shares convert to
            at a rate of 4.0% during the                            D shares automatically
            first year, decreasing 1.0%                              after approximately
                  annually to 0.0% (/4/)                                ten years(/5/)
- ------------------------------------------------------------------------------------------
    C       1.0% CDSC for one year(/6/)       0.25%        0.35%              No
- ------------------------------------------------------------------------------------------
    D           Maximum 4.0% initial          0.10%         No                No
                 sales charge(/3/)
</TABLE>    
 
- --------
(1) Initial sales charges are imposed at the time of purchase as a percentage
    of the offering price. CDSCs are imposed if the redemption occurs within
    the applicable CDSC time period. The charge will be assessed on an amount
    equal to the lesser of the proceeds of redemption or the cost of the
    shares being redeemed.
   
(2) Offered only to eligible investors. See "Initial Sales Charge
    Alternatives--Class A and Class D Shares--Eligible Class A Investors."
           
(3) Reduced for purchases of $25,000 or more and waived for purchases of Class
    A shares by participants in connection with certain fee-based programs.
    Class A and Class D share purchases of $1,000,000 or more may not be
    subject to an initial sales charge but instead may be subject to a 1.0%
    CDSC if redeemed within one year. Such CDSC may be waived in connection
    with certain fee-based programs.     
   
(4) The CDSC may be modified in connection with certain fee-based programs.
        
(5) The conversion period for dividend reinvestment shares and certain fee-
    based programs may be modified. Also, Class B shares of certain other
    MLAM-advised mutual funds into which exchanges may be made have an eight
    year conversion period. If Class B
 
                                             (footnotes continued on next page)
 
                                      24
<PAGE>
 
  shares of the Fund are exchanged for Class B shares of another MLAM-advised
  mutual fund, the conversion period applicable to the Class B shares acquired
  in the exchange will apply, and the holding period for the shares exchanged
  will be tacked onto the holding period for the shares acquired.
   
(6) The CDSC may be waived in connection with certain fee-based programs.     
 
INITIAL SALES CHARGE ALTERNATIVES--CLASS A AND CLASS D SHARES
 
  Investors choosing the initial sales charge alternatives who are eligible to
purchase Class A shares should purchase Class A rather than Class D shares
because there is an account maintenance fee imposed on Class D shares.
 
  The public offering price of Class A and Class D shares for purchasers
choosing the initial sales charge alternative is the next determined net asset
value plus varying sales charges (i.e., sales loads), as set forth below.
 
<TABLE>
<CAPTION>
                             SALES CHARGE   SALES CHARGE       DISCOUNT TO
                             AS PERCENTAGE AS PERCENTAGE*    SELECTED DEALERS
                              OF OFFERING    OF THE NET    AS PERCENTAGE OF THE
AMOUNT OF PURCHASE               PRICE     AMOUNT INVESTED    OFFERING PRICE
- ------------------           ------------- --------------- --------------------
<S>                          <C>           <C>             <C>
Less than $25,000...........     4.00%          4.17%              3.75%
$25,000 but less than
 $50,000....................     3.75           3.90               3.50
$50,000 but less than
 $100,000...................     3.25           3.36               3.00
$100,000 but less than
 $250,000...................     2.50           2.56               2.25
$250,000 but less than
 $1,000,000.................     1.50           1.52               1.25
$1,000,000 and over**.......     0.00           0.00               0.00
</TABLE>
- --------
 * Rounded to the nearest one-hundredth percent.
   
** The initial sales charge may be waived on Class A and Class D purchases of
   $1,000,000 or more and on Class A purchases by certain participants in
   connection with certain fee-based programs. If the sales charge is waived
   in connection with a purchase of $1,000,000 or more, such purchases may be
   subject to a 1.0% CDSC if the shares are redeemed within one year after
   purchase. Such CDSC may be waived in connection with certain fee-based
   programs. The charge will be assessed on an amount equal to the lesser of
   the proceeds of redemption or the cost of the shares being redeemed.     
   
  The Distributor may reallow discounts to selected dealers and retain the
balance over such discounts. At times the Distributor may reallow the entire
sales charge to such dealers. Since securities dealers selling Class A and
Class D shares of the Fund will receive a concession equal to most of the
sales charge, they may be deemed to be underwriters under the Securities Act
of 1933, as amended. For the fiscal year ended July 31, 1997, the Fund sold
65,128 Class A shares for aggregate net proceeds of $698,880. The gross sales
charges for the sale of Class A shares of the Fund for the year were $530, of
which $40 and $490 were received by the Distributor and Merrill Lynch,
respectively. For the fiscal year ended July 31, 1997, the Distributor
received no CDSCs with respect to redemption within one year after purchase of
Class A shares purchased subject to a front-end sales charge waiver. For the
fiscal year ended July 31, 1997, the Fund sold 33,863 Class D shares for
aggregate net proceeds of $366,272. The gross sales charges for the sale of
Class D shares of the Fund for the year were $2,819, of which $314 and $2,505
were received by the Distributor and Merrill Lynch, respectively. For the
fiscal year ended July 31, 1997, the Distributor received no CDSCs with
respect to redemption within one year after purchase of Class D shares
purchased subject to a front-end sales charge waiver.     
 
  Eligible Class A Investors. Class A shares are offered to a limited group of
investors and also will be issued upon reinvestment of dividends on
outstanding Class A shares. Investors that currently own Class A shares of the
Fund in a shareholder account are entitled to purchase additional Class A
shares of the Fund in
 
                                      25
<PAGE>
 
   
that account. Class A shares are available at net asset value to corporate
warranty insurance reserve fund programs and U.S. branches of foreign banking
institutions provided that the program or branch has $3 million or more
initially invested in MLAM-advised mutual funds. Also eligible to purchase
Class A shares at net asset value are participants in certain investment
programs including TMA SM Managed Trusts to which Merrill Lynch Trust Company
provides discretionary trustee services, collective investment trusts for
which Merrill Lynch Trust Company serves as trustee, and purchases made in
connection with certain fee-based programs. In addition, Class A shares are
offered at net asset value to ML & Co., and its subsidiaries and their
directors and employees and to members of the Boards of MLAM-advised
investment companies, including the Trust. Certain persons who acquired shares
of certain MLAM-advised closed-end funds in their initial offerings who wish
to reinvest the net proceeds from a sale of their closed-end fund shares of
common stock in shares of the Fund also may purchase Class A shares of the
Fund if certain conditions set forth in the Statement of Additional
Information are met. In addition, Class A shares of the Fund and certain other
MLAM-advised mutual funds are offered at net asset value to shareholders of
Merrill Lynch Senior Floating Rate Fund, Inc. and, if certain conditions set
forth in the Statement of Additional Information are met, to shareholders of
Merrill Lynch Municipal Strategy Fund, Inc. and Merrill Lynch High Income
Municipal Bond Fund, Inc. who wish to reinvest the net proceeds from a sale of
certain of their shares of common stock pursuant to a tender offer conducted
by such funds in shares of the Fund and certain other MLAM-advised mutual
funds.     
   
  Reduced Initial Sales Charges. No initial sales charges are imposed upon
Class A and Class D shares issued as a result of the automatic reinvestment of
dividends or capital gains distributions. Class A and Class D sales charges
also may be reduced under a Right of Accumulation and a Letter of Intention.
Class A shares are offered at net asset value to certain eligible Class A
investors as set forth above under "Eligible Class A Investors." See
"Shareholder Services--Fee-Based Programs." Provided applicable threshold
requirements are met, either Class A or Class D shares are offered at net
asset value to Employee Access SM Accounts available through authorized
employers. Class A shares are offered at net asset value to shareholders of
Merrill Lynch Senior Floating Rate Fund, Inc. and subject to certain
conditions. Class A and Class D shares are offered at net asset value to
shareholders of Merrill Lynch Municipal Strategy Fund, Inc. and Merrill Lynch
High Income Municipal Bond Fund, Inc. who wish to reinvest in shares of the
Fund the net proceeds from a sale of certain of their shares of common stock,
pursuant to tender offers conducted by those funds.     
 
  Class D shares are offered at net asset value without sales charge to an
investor who has a business relationship with a Merrill Lynch financial
consultant, if certain conditions set forth in the Statement of Additional
Information are met. Class D shares may be offered at net asset value in
connection with the acquisition of assets of other investment companies.
 
  Additional information concerning these reduced initial sales charges is set
forth in the Statement of Additional Information.
 
DEFERRED SALES CHARGE ALTERNATIVES--CLASS B AND CLASS C SHARES
 
  Investors choosing the deferred sales charge alternatives should consider
Class B shares if they intend to hold their shares for an extended period of
time and Class C shares if they are uncertain as to the length of time they
intend to hold their assets in MLAM-advised mutual funds.
 
                                      26
<PAGE>
 
   
  The public offering price of Class B and Class C shares for investors
choosing the deferred sales charge alternatives is the next determined net
asset value per share without the imposition of a sales charge at the time of
purchase. As discussed below, Class B shares are subject to a four-year CDSC
which declines each year, while Class C shares are subject only to a one-year
1.0% CDSC. On the other hand, approximately ten years after Class B shares are
issued, such Class B shares, together with shares issued upon dividend
reinvestment with respect to those shares, are automatically converted into
Class D shares of the Fund and thereafter will be subject to lower continuing
fees. See "Conversion of Class B Shares to Class D Shares" below. Both Class B
and Class C shares are subject to an account maintenance fee of 0.25% of net
assets and Class B and Class C shares are subject to distribution fees of 0.25%
and 0.35%, respectively, of net assets as discussed below under "Distribution
Plans."     
   
  Class B and Class C shares are sold without an initial sales charge so that
the Fund will receive the full amount of the investor's purchase payment.
Merrill Lynch compensates its Financial Consultants for selling Class B and
Class C shares at the time of purchase from its own funds. See "Distribution
Plans" below.     
   
  Proceeds from the CDSCs and the distribution fees are paid to the Distributor
and are used in whole or in part by the Distributor to defray the expenses of
dealers (including Merrill Lynch) related to providing distribution-related
services to the Fund in connection with the sale of the Class B and Class C
shares, such as the payment of compensation to financial consultants for
selling Class B and Class C shares from the dealer's own funds. The combination
of the CDSC and the ongoing distribution fee facilitates the ability of the
Fund to sell the Class B and Class C shares without a sales charge being
deducted at the time of purchase. The proceeds from the account maintenance
fees are used to compensate Merrill Lynch (pursuant to a sub-agreement) for
providing continuing account maintenance activities. Approximately ten years
after issuance, Class B shares will convert automatically into Class D shares
of the Fund, which are subject to a lower account maintenance fee and no
distribution fee; Class B shares of certain other MLAM-advised mutual funds
into which exchanges may be made convert into Class D shares automatically
after approximately eight years. If Class B shares of the Fund are exchanged
for Class B shares of another MLAM-advised mutual fund, the conversion period
applicable to the Class B shares acquired in the exchange will apply, and the
holding period for the shares exchanged will be tacked on to the holding period
for the shares acquired.     
   
  Imposition of the CDSC and the distribution fee on Class B and Class C shares
is limited by the NASD asset-based sales charge rule. See "Limitations on the
Payment of Deferred Sales Charges" below. The proceeds from the ongoing account
maintenance fees are used to compensate the Distributor and Merrill Lynch
(pursuant to a sub-agreement) for providing continuing account maintenance
activities. Class B shareholders of the Fund exercising the exchange privilege
described under "Shareholder Services--Exchange Privilege" will continue to be
subject to the Fund's CDSC schedule if such schedule is higher than the CDSC
schedule relating to the Class B shares acquired as a result of the exchange.
       
  Contingent Deferred Sales Charges--Class B Shares. Class B shares that are
redeemed within four years of purchase may be subject to a CDSC at the rates
set forth below charged as a percentage of the dollar amount subject thereto.
The charge will be assessed on an amount equal to the lesser of the proceeds of
redemption or the cost of the shares being redeemed. Accordingly, no sales
charge will be imposed on increases in net asset value above the initial
purchase price. In addition, no charge will be assessed on shares derived from
reinvestment of dividends or capital gains distributions.     
 
                                       27
<PAGE>
 
  The following table sets forth the rates of the Class B CDSC:
<TABLE>
<CAPTION>
                                                                   CDSC AS A
                                                                 PERCENTAGE OF
                                                                 DOLLAR AMOUNT
                                                                  SUBJECT TO
   YEAR SINCE PURCHASE PAYMENT MADE                                 CHARGE
   --------------------------------                              -------------
   <S>                                                           <C>
   0-1..........................................................     4.0%
   1-2..........................................................     3.0%
   2-3..........................................................     2.0%
   3-4..........................................................     1.0%
   4 and thereafter.............................................     0.0%
</TABLE>
   
For the fiscal year ended July 31, 1997, the Distributor received CDSCs of
$81,715 with respect to redemptions of Class B shares, all of which were paid
to Merrill Lynch. Additional CDSCs payable to the Distributor may have been
waived or converted to a contingent obligation in connection with a
shareholder's participation in certain fee-based programs.     
 
  In determining whether a CDSC is applicable to a redemption, the calculation
will be determined in the manner that results in the lowest applicable rate
being charged. Therefore, it will be assumed that the redemption is first of
shares held for over four years or shares acquired pursuant to reinvestment of
dividends or distributions and then of shares held longest during the four-
year period. The charge will not be applied to dollar amounts representing an
increase in the net asset value since the time of purchase. A transfer of
shares from a shareholder's account to another account will be assumed to be
made in the same order as a redemption.
 
  To provide an example, assume an investor purchased 100 shares at $10 per
share (at a cost of $1,000) and in the third year after purchase, the net
asset value per share is $12 and, during such time, the investor has acquired
10 additional shares upon dividend reinvestment. If at such time the investor
makes his first redemption of 50 shares (proceeds of $600), 10 shares will not
be subject to a CDSC because of dividend reinvestment. With respect to the
remaining 40 shares, the CDSC is applied only to the original cost of $10 per
share and not to the increase in net asset value of $2 per share. Therefore,
$400 of the $600 redemption proceeds will be charged at a rate of 2.0% (the
applicable rate in the third year after purchase).
   
  The Class B CDSC is waived on redemptions of shares following the death or
disability (as defined in the Code) of a shareholder. The Class B CDSC also is
waived for any Class B shares that are purchased within qualifying Employee
Access SM Accounts. Additional information concerning the waiver of the
Class B CDSC is set forth in the Statement of Additional Information. The
terms of the CDSC may be modified in connection with redemptions of fund
participation in certain fee-based programs. See "Shareholder Services--Fee-
Based Programs."     
   
  Contingent Deferred Sales Charges--Class C Shares. Class C shares that are
redeemed within one year of purchase may be subject to a 1.0% CDSC charged as
a percentage of the dollar amount subject thereto. The charge will be assessed
on an amount equal to the lesser of the proceeds of redemption or the cost of
the shares being redeemed. Accordingly, no Class C CDSC will be imposed on
increases in net asset value above the initial purchase price. In addition, no
Class C CDSC will be assessed on shares derived from reinvestment of dividends
or capital gains distributions. For the fiscal year ended July 31, 1997, the
Distributor received CDSCs of $1,089 with respect to redemptions of Class C
shares, all of which were paid to Merrill Lynch. The Class C CDSC may be
waived in connection with certain fee-based programs. See "Shareholder
Services--Fee-Based Programs."     
 
                                      28
<PAGE>
 
  In determining whether a Class C CDSC is applicable to a redemption, the
calculation will be determined in the manner that results in the lowest
possible rate being charged. Therefore, it will be assumed that the redemption
is first of shares held for over one year or shares acquired pursuant to
reinvestment of dividends or distributions and then of shares held longest
during the one-year period. The charge will not be applied to dollar amounts
representing an increase in the net asset value since the time of purchase. A
transfer of shares from a shareholder's account to another account will be
assumed to be made in the same order as a redemption.
 
  Conversion of Class B Shares to Class D Shares. After approximately ten years
(the "Conversion Period"), Class B shares will be converted automatically into
Class D shares of the Fund. Class D shares are subject to an ongoing account
maintenance fee of 0.10% of net assets but are not subject to the distribution
fee that is borne by Class B shares. Automatic conversion of Class B shares
into Class D shares will occur at least once each month (on the "Conversion
Date") on the basis of the relative net asset values of the shares of the two
classes on the Conversion Date, without the imposition of any sales load, fee
or other charge. Conversion of Class B shares to Class D shares will not be
deemed a purchase or sale of the shares for Federal income tax purposes.
 
  In addition, shares purchased through reinvestment of dividends on Class B
shares also will convert automatically to Class D shares. The Conversion Date
for dividend reinvestment shares will be calculated taking into account the
length of time the shares underlying such dividend reinvestment shares were
outstanding. If at a Conversion Date the conversion of Class B shares to Class
D shares of the Fund in a single account will result in less than $50 worth of
Class B shares being left in the account, all of the Class B shares of the Fund
held in the account on the Conversion Date will be converted to Class D shares
of the Fund.
 
  Share certificates for Class B shares of the Fund to be converted must be
delivered to the Transfer Agent at least one week prior to the Conversion Date
applicable to those shares. In the event such certificates are not received by
the Transfer Agent at least one week prior to the Conversion Date, the related
Class B shares will convert to Class D shares on the next scheduled Conversion
Date after such certificates are delivered.
 
  In general, Class B shares of equity MLAM-advised mutual funds will convert
approximately eight years after initial purchase, and Class B shares of taxable
and tax-exempt fixed income MLAM-advised mutual funds will convert
approximately ten years after initial purchase. If, during the Conversion
Period, a shareholder exchanges Class B shares with an eight-year Conversion
Period for Class B shares with a ten-year Conversion Period, or vice versa, the
Conversion Period applicable to the Class B shares acquired in the exchange
will apply, and the holding period for the shares exchanged will be tacked on
to the holding period for the shares acquired.
   
  The Conversion Period also may be modified for investors who participate in
certain fee-based programs. See "Shareholder Services--Fee-Based Programs."
    
DISTRIBUTION PLANS
 
  The Fund has adopted separate distribution plans for Class B, Class C and
Class D shares pursuant to Rule 12b-1 under the 1940 Act (each a "Distribution
Plan") with respect to the account maintenance and/or distribution fees paid by
the Fund to the Distributor with respect to such classes. The Class B and Class
C Distribution Plans provide for the payment of account maintenance fees and
distribution fees, and the Class D Distribution Plan provides for the payment
of account maintenance fees.
 
                                       29
<PAGE>
 
   
  The Distribution Plans for Class B, Class C and Class D shares each provides
that the Fund pays the Distributor an account maintenance fee relating to the
shares of the relevant class, accrued daily and paid monthly, at the annual
rates of 0.25%, 0.25% and 0.10%, respectively, of the average daily net assets
of the Fund attributable to shares of the relevant class in order to compensate
the Distributor and Merrill Lynch (pursuant to a sub-agreement) in connection
with account maintenance activities.     
 
  The Distribution Plans for Class B and Class C shares each provide that the
Fund also pays the Distributor a distribution fee relating to the shares of the
relevant class, accrued daily and paid monthly, at the annual rate of 0.25% and
0.35%, respectively, of the average daily net assets of the Fund attributable
to the shares of the relevant class in order to compensate the Distributor and
Merrill Lynch (pursuant to a sub-agreement) for providing shareholder and
distribution services, and bearing certain distribution-related expenses of the
Fund, including payments to financial consultants for selling Class B and Class
C shares of the Fund. The Distribution Plans relating to Class B and Class C
shares are designed to permit an investor to purchase Class B and Class C
shares through dealers without the assessment of an initial sales charge and at
the same time permit the dealer to compensate its financial consultants in
connection with the sale of the Class B and Class C shares. In this regard, the
purpose and function of the ongoing distribution fee and the CDSC are the same
as those of the initial sales charge with respect to the Class A and Class D
shares of the Fund in that the deferred sales charges provide for the financing
of the distribution of the Fund's Class B and Class C shares.
   
  For the fiscal year ended July 31, 1997, the Fund paid the Distributor
$280,454 pursuant to the Class B Distribution Plan (based on average daily net
assets subject to such Class B Distribution Plan of approximately $56.1
million), all of which was paid to Merrill Lynch for providing account
maintenance and distribution-related activities and services in connection with
Class B shares. For the fiscal year ended July 31, 1997, the Fund paid the
Distributor $9,407 pursuant to the Class C Distribution Plan (based on average
daily net assets subject to such Class C Distribution Plan of approximately
$1.6 million), all of which was paid to Merrill Lynch for providing account
maintenance and distribution-related activities and services in connection with
Class C shares. For the fiscal year ended July 31, 1997, the Fund paid the
Distributor $1,356 pursuant to the Class D Distribution Plan (based on average
daily net assets subject to such Class D Distribution Plan of approximately
$1.4 million), all of which was paid to Merrill Lynch for providing account
maintenance activities in connection with Class D shares.     
 
  Payments under the Distribution Plans are based on a percentage of average
daily net assets attributable to the shares regardless of the amount of
expenses incurred, and, accordingly, distribution-related revenues from the
Distribution Plans may be more or less than distribution-related expenses.
Information with respect to the distribution-related revenues and expenses is
presented to the Trustees for their consideration in connection with their
deliberations as to the continuance of the Class B and Class C Distribution
Plans. This information is presented annually as of December 31 of each year on
a "fully allocated accrual" basis and quarterly on a "direct expense and
revenue/cash" basis. On the fully allocated accrual basis, revenues consist of
the account maintenance fees, distribution fees, the CDSCs and certain other
related revenues, and expenses consist of financial consultant compensation,
branch office and regional operation center selling and transaction processing
expenses, advertising, sales promotion and market expenses, corporate overhead
and interest expense. On the direct expense and revenue/cash basis, revenues
consist of the account maintenance fees, distribution fees and CDSCs, and the
expenses consist of financial consultant compensation.
 
                                       30
<PAGE>
 
   
  As of December 31, 1996, the fully allocated accrual expenses incurred by the
Distributor and Merrill Lynch for the period since the commencement of
operations of Class B shares exceeded fully allocated accrual revenues by
approximately $1,037,000 (2.03% of Class B net assets at that date). As of July
31, 1997, direct cash revenues for the period since the commencement of
operations of Class B shares exceeded direct cash expenses by $1,012,056 (1.90%
of Class B net assets at that date). As of December 31, 1996, the fully
allocated accrual expenses incurred by the Distributor and Merrill Lynch for
the period since the commencement of operations of Class C shares exceeded
fully allocated revenues by approximately $2,000 (.14% of Class C net assets at
that date). As of July 31, 1997, direct cash revenues for the period since the
commencement of operations of Class C shares exceeded direct cash expenses by
$10,313 (0.69% of Class C net assets at that date).     
 
LIMITATIONS ON THE PAYMENT OF DEFERRED SALES CHARGES
 
  The maximum sales charge rule in the Conduct Rules of the NASD imposes a
limitation on certain asset-based sales charges such as the distribution fee
and the CDSC borne by the Class B and Class C shares, but not the account
maintenance fee. The maximum sales charge rule is applied separately to each
class. As applicable to the Fund, the maximum sales charge rule limits the
aggregate of distribution fee payments and CDSCs payable by the Fund to (1)
6.25% of eligible gross sales of Class B shares and Class C shares, computed
separately (defined to exclude shares issued pursuant to dividend reinvestments
and exchanges) plus (2) interest on the unpaid balance for the respective
class, computed separately, at the prime rate plus 1% (the unpaid balance being
the maximum amount payable minus amounts received from the payment of the
distribution fee and the CDSC). In connection with the Class B shares, the
Distributor has voluntarily agreed to waive interest charges on the unpaid
balance in excess of 0.50% of eligible gross sales. Consequently, the maximum
amount payable to the Distributor (referred to as the "voluntary maximum") in
connection with the Class B shares is 6.75% of eligible gross sales. The
Distributor retains the right to stop waiving the interest charges at any time.
To the extent payments would exceed the voluntary maximum, the Fund will not
make further payments of the distribution fee with respect to Class B shares,
and any CDSCs will be paid to the Fund rather than to the Distributor; however,
the Fund will continue to make payments of the account maintenance fee. In
certain circumstances the amount payable pursuant to the voluntary maximum may
exceed the amount payable under the NASD formula. In such circumstances
payments in excess of the amount payable under the NASD formula will not be
made.
   
  The Fund has no obligation with respect to distribution and/or account
maintenance-related expenses incurred by the Distributor and Merrill Lynch in
connection with Class B, Class C and Class D shares, and there is no assurance
that the Trustees of the Trust will approve the continuance of the Distribution
Plans from year to year. However, the Distributor intends to seek annual
continuation of the Distribution Plans. In their review of the Distribution
Plans, the Trustees will be asked to take into consideration expenses incurred
in connection with the account maintenance and/or distribution of each class of
shares separately. The initial sales charges, the account maintenance fees, the
distribution fees and/or the CDSCs received with respect to one class will not
be used to subsidize the sale of shares of another class. Payments of the
distribution fee on Class B shares will terminate upon conversion of those
Class B shares into Class D shares as set forth under "Deferred Sales Charge
Alternatives--Class B and Class C Shares--Conversion of Class B Shares to Class
D Shares."     
 
                                       31
<PAGE>
 
                              REDEMPTION OF SHARES
   
  The Trust is required to redeem for cash all shares of the Fund upon receipt
of a written request in proper form. The redemption price is the net asset
value per share next determined after the initial receipt of proper notice of
redemption. Except for any CDSC that may be applicable, there will be no charge
for redemption if the redemption request is sent directly to the Transfer
Agent. Shareholders liquidating their holdings will receive upon redemption all
dividends reinvested through the date of redemption. The value of shares at the
time of redemption may be more or less than the shareholder's cost, depending
on the market value of the securities held by the Fund at such time.     
 
REDEMPTION
   
  A shareholder wishing to redeem shares may do so, without charge, by
tendering the shares directly to the Transfer Agent, Merrill Lynch Financial
Data Services, Inc., P.O. Box 45289, Jacksonville, Florida 32232-5289.
Redemption requests delivered other than by mail should be delivered to Merrill
Lynch Financial Data Services, Inc., 4800 Deer Lake Drive East, Jacksonville,
Florida 32246-6484. Proper notice of redemption in the case of shares deposited
with the Transfer Agent may be accomplished by a written letter requesting
redemption. Proper notice of redemption in the case of shares for which
certificates have been issued may be accomplished by a written letter as noted
above accompanied by certificates for the shares to be redeemed. Redemption
requests should not be sent to the Trust. The redemption request in either
event requires the signature(s) of all persons in whose name(s) the shares are
registered, signed exactly as such name(s) appear(s) on the Transfer Agent's
register. The signature(s) on the redemption request must be guaranteed by an
"eligible guarantor institution" as such term is defined in Rule 17Ad-15 under
the Securities Exchange Act of 1934, as amended, the existence and validity of
which may be verified by the Transfer Agent through the use of industry
publications. Notarized signatures are not sufficient. In certain instances,
the Transfer Agent may require additional documents such as, but not limited
to, trust instruments, death certificates, appointments as executor or
administrator, or certificates of corporate authority. For shareholders
redeeming directly with the Transfer Agent, payments will be mailed within
seven days of receipt of a proper notice of redemption.     
 
  At various times the Trust may be requested to redeem Fund shares for which
it has not yet received good payment (e.g., cash, Federal funds or certified
check drawn on a United States bank). The Trust may delay or cause to be
delayed the mailing of a redemption check until such time as it has assured
itself that good payment has been collected for the purchase of such Fund
shares, which will not exceed 10 days.
 
REPURCHASE
 
  The Trust also will repurchase Fund shares through a shareholder's listed
securities dealer. The Trust normally will accept orders to repurchase Fund
shares by wire or telephone from dealers for their customers at the net asset
value next computed after receipt of the order by the dealer, provided that the
request for repurchase is received by the dealer prior to the close of business
on the NYSE (generally, 4:00 P.M., New York time) on the day received and such
request is received by the Trust from such dealer not later than 30 minutes
after the close of business on the NYSE on the same day. Dealers have the
responsibility of submitting such repurchase requests to the Trust not later
than 30 minutes after the close of business on the NYSE, in order to obtain
that day's closing price.
 
                                       32
<PAGE>
 
   
  The foregoing repurchase arrangements are for the convenience of shareholders
and do not involve a charge by the Trust (other than any applicable CDSC).
Securities firms that do not have selected dealer agreements with the
Distributor, however, may impose a transaction charge on the shareholder for
transmitting the notice of repurchase to the Trust. Merrill Lynch may charge
its customers a processing fee (presently $5.35) to confirm a repurchase of
shares to such customers. Repurchases made directly through the Fund's Transfer
Agent are not subject to the processing fee. The Trust reserves the right to
reject any order for repurchase, which right of rejection might adversely
affect shareholders seeking redemption through the repurchase procedure.
However, a shareholder whose order for repurchase is rejected by the Trust may
redeem Fund shares as set forth above.     
 
  Redemption payments will be made within seven days of the proper tender of
the certificates, if any, and stock power or letter requesting redemption, in
each instance with signatures guaranteed as noted above.
 
REINSTATEMENT PRIVILEGE--CLASS A AND CLASS D SHARES
 
  Shareholders who have redeemed their Class A or Class D shares have a
privilege to reinstate their accounts by purchasing Class A or Class D shares
of the Fund, as the case may be, at net asset value without a sales charge up
to the dollar amount redeemed. The reinstatement privilege may be exercised by
sending a notice of exercise along with a check for the amount to be reinstated
to the Transfer Agent within 30 days after the date the request for redemption
was accepted by the Transfer Agent or the Distributor. Alternatively, the
reinstatement privilege may be exercised through the investor's Merrill Lynch
Financial Consultant within 30 days after the date the request for redemption
was accepted by the Transfer Agent or the Distributor. The reinstatement will
be made at the net asset value per share next determined after the notice of
reinstatement is received and cannot exceed the amount of the redemption
proceeds.
 
                              SHAREHOLDER SERVICES
   
  The Trust offers a number of shareholder services and investment plans
described below that are designed to facilitate investment in shares of the
Fund. Full details as to each of such services, copies of the various plans
described below, and instructions as to how to participate in the various
services or plans, or to change options with respect thereto can be obtained
from the Trust by calling the telephone number on the cover page hereof or from
the Distributor or Merrill Lynch.     
 
INVESTMENT ACCOUNT
 
  Each shareholder whose account is maintained at the Transfer Agent has an
Investment Account and will receive statements at least quarterly from the
Transfer Agent. These statements will serve as transaction confirmations for
automatic investment purchases and the reinvestment of ordinary income
dividends and long-term capital gains distributions. These statements will also
show any other activity in the account since the preceding statement.
Shareholders will receive separate transaction confirmations for each purchase
or sale transaction other than automatic investment purchases and the
reinvestments of ordinary income dividends and long-term capital gains
distributions. A shareholder may make additions to his or her Investment
Account at any time by mailing a check directly to the Transfer Agent.
Shareholders may also maintain their accounts through Merrill Lynch. Upon the
transfer of shares out of a Merrill Lynch brokerage
 
                                       33
<PAGE>
 
   
account, an Investment Account in the transferring shareholder's name will be
opened automatically at the Transfer Agent. Shareholders considering
transferring their Class A or Class D shares from Merrill Lynch to another
brokerage firm or financial institution should be aware that, if the firm to
which the Class A or Class D shares are to be transferred will not take
delivery of shares of the Fund, a shareholder either must redeem the Class A
or Class D shares (paying any applicable CDSC) so that the cash proceeds can
be transferred to the account at the new firm or such shareholder must
continue to maintain an Investment Account at the Transfer Agent for those
Class A or Class D shares. Shareholders interested in transferring their Class
B or Class C shares from Merrill Lynch and who do not wish to have an
Investment Account maintained for such shares at the Transfer Agent may
request their new brokerage firm to maintain such shares in an account
registered in the name of the brokerage firm for the benefit of the
shareholder at the Transfer Agent. If the new brokerage firm is willing to
accommodate the shareholder in this manner, the shareholder must request that
he or she be issued certificates for such shares and then must turn the
certificates over to the new firm for re-registration as described in the
preceding sentence.     
 
EXCHANGE PRIVILEGE
 
  U.S. shareholders of each class of shares of the Fund have an exchange
privilege with certain other MLAM-advised mutual funds. There is currently no
limitation on the number of times a shareholder may exercise the exchange
privilege. The exchange privilege may be modified or terminated at any time in
accordance with the rules of the Commission.
   
  Under the Merrill Lynch Select Pricing SM System, Class A shareholders may
exchange Class A shares of the Fund for Class A shares of a second MLAM-
advised mutual fund if the shareholder holds any Class A shares of the second
fund in the account in which the exchange is made at the time of the exchange
or is otherwise eligible to purchase Class A shares of the second fund. If the
Class A shareholder wants to exchange Class A shares for shares of a second
MLAM-advised mutual fund, and the shareholder does not hold Class A shares of
the second fund in his or her account at the time of the exchange and is not
otherwise eligible to acquire Class A shares of the second fund, the
shareholder will receive Class D shares of the second fund as a result of the
exchange. Class D shares also may be exchanged for Class A shares of a second
MLAM-advised mutual fund at any time as long as, at the time of the exchange,
the shareholder holds Class A shares of the second fund in the account in
which the exchange is made or is otherwise eligible to purchase Class A shares
of the second fund.     
 
  Exchanges of Class A and Class D shares are made on the basis of the
relative net asset values per Class A or Class D share, respectively, plus an
amount equal to the difference, if any, between the sales charge previously
paid on the Class A or Class D shares being exchanged and the sales charge
payable at the time of the exchange on the shares being acquired.
 
  Class B, Class C and Class D shares are exchangeable with shares of the same
class of other MLAM-advised mutual funds.
   
  Shares of the Fund that are subject to a CDSC are exchangeable on the basis
of relative net asset value per share without the payment of any CDSC that
might otherwise be due upon redemption of the shares of the Fund. For purposes
of computing the CDSC that may be payable upon a disposition of the shares
acquired in the exchange, the holding period for the previously owned shares
of the Fund is "tacked" to the holding period for the newly acquired shares of
the other fund.     
 
                                      34
<PAGE>
 
  Class A, Class B, Class C and Class D shares also are exchangeable for shares
of certain MLAM-advised money market funds specifically designated as available
for exchange by holders of Class A, Class B, Class C or Class D shares. The
period of time that Class A, Class B, Class C or Class D shares are held in a
money market fund, however, will not count toward satisfaction of the holding
period requirement for reduction of any CDSC imposed on such shares, if any,
and, with respect to Class B shares, toward satisfaction of the Conversion
Period.
 
  Class B shareholders of the Fund exercising the exchange privilege will
continue to be subject to the Fund's CDSC schedule if such schedule is higher
than the CDSC schedule relating to the new Class B shares. In addition, Class B
shares of the Fund acquired through use of the exchange privilege will be
subject to the Fund's CDSC schedule if such schedule is higher than the CDSC
schedule relating to the Class B shares of the MLAM-advised mutual fund from
which the exchange has been made.
   
  Exercise of the exchange privilege is treated as a sale of the exchanged
shares and a purchase of the acquired shares for Federal income tax purposes.
For further information, see "Shareholder Services--Exchange Privilege" in the
Statement of Additional Information.     
 
AUTOMATIC REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS
   
  All dividends and capital gains distributions are reinvested automatically in
full and fractional shares of the Fund, without a sales charge, at the net
asset value per share at the close of business on the monthly payment date for
such dividends and distributions. A shareholder may at any time, by written
notification to Merrill Lynch, if the shareholder's account is maintained with
Merrill Lynch, 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 monthly.
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. Cash payments can also be directly
deposited to the shareholder's bank account. No CDSC will be imposed upon
redemption of shares issued as a result of the automatic reinvestment of
dividends or capital gains distributions.     
 
SYSTEMATIC WITHDRAWAL PLANS
   
  A shareholder may elect to receive systematic withdrawal payments from his or
her Investment Account through automatic payment by check or through automatic
payment by direct deposit to his or her bank account on either a monthly or
quarterly basis. Alternatively, a shareholder whose shares are held within a
CMA (R) or CBA (R) account may elect to have shares redeemed on a monthly,
bimonthly, quarterly, semiannual or annual basis through the CMA (R)/CBA (R)
Systematic Redemption Program, subject to certain conditions. With respect to
redemptions of Class B or Class C shares pursuant to a systematic withdrawal
plan, the maximum number of Class B or Class C shares that can be redeemed from
an account annually shall not exceed 10% of the value of shares of such class
in that account at the time the election to join the systematic withdrawal plan
was made. Any CDSC that otherwise might be due on such redemption of Class B or
Class C shares will be waived. Shares redeemed pursuant to a systematic
withdrawal plan will be redeemed in the same order as Class B or Class C shares
are otherwise redeemed. See "Purchase of Shares--Deferred Sales Charge
Alternatives--Class B and Class C Shares--Contingent Deferred Sales Charges--
Class B Shares"     
 
                                       35
<PAGE>
 
   
and "Contingent Deferred Sales Charges--Class C Shares." Where the systematic
withdrawal plan is applied to Class B shares, upon conversion of the last Class
B shares in an account to Class D shares, the systematic withdrawal plan will
automatically be applied thereafter to Class D shares. See "Purchase of
Shares--Deferred Sales Charge Alternatives--Class B and Class C Shares--
Conversion of Class B Shares to Class D Shares."     
 
AUTOMATIC INVESTMENT PLANS
 
  Regular additions of Class A, Class B, Class C and Class D shares may be made
to an investor's Investment Account by prearranged charges of $50 or more to
his or her regular bank account. Alternatively, investors who maintain CMA (R)
or CBA (R) accounts may arrange to have periodic investments made in the Fund
in their CMA (R) or CBA (R) account or in certain related accounts in amounts
of $100 or more through the CMA (R) or CBA (R) Automated Investment Program.
 
FEE-BASED PROGRAMS
   
  Certain Merrill Lynch fee-based programs, including pricing alternatives for
securities transactions, (each referred to in this paragraph as a "Program")
may permit the purchase of Class A shares at net asset value. Under specified
circumstances, participants in certain Programs may deposit other classes of
shares which will be exchanged for Class A shares. Initial or deferred sales
charges otherwise due in connection with such exchanges may be waived or
modified, as may the Conversion Period applicable to the deposited shares.
Termination of participation in a Program may result in the redemption of
shares held therein or the automatic exchange thereof to another class at net
asset value, which may be shares of a money market fund. In addition, upon
termination of participation in a Program, shares that have been held for less
than specified periods within such Program may be subject to a fee based upon
the current value of such shares. These Programs also generally prohibit such
shares from being transferred to another account at Merrill Lynch, to another
broker-dealer or to the Transfer Agent. Except in limited circumstances (which
may also involve an exchange as described above), such shares must be redeemed
and another class of shares purchased (which may involve the imposition of
initial or deferred sales charges and distribution and account maintenance
fees) in order for the investment not to be subject to Program fees. Additional
information regarding a specific Program (including charges and limitations on
transferability applicable to shares that may be held in such Program) is
available in such Program's client agreement and from the Transfer Agent at
(800) MER-FUND or (800) 637-3863.     
 
                             PORTFOLIO TRANSACTIONS
 
  The Trust has no obligation to deal with any dealer or group of dealers in
the execution of transactions in portfolio securities of the Fund. Municipal
Bonds and other securities in which the Fund invests are traded primarily in
the over-the-counter market. Where possible, the Trust deals directly with the
dealers who make a market in the securities involved except in those
circumstances where better prices and execution are available elsewhere. It is
the policy of the Trust to obtain the best net results in conducting portfolio
transactions for the Fund, taking into account such factors as price (including
the applicable dealer spread), the size, type and difficulty of the
transactions involved, the firm's general execution and operations facilities,
and the firm's risk in positioning the securities involved and the provision of
supplemental investment
 
                                       36
<PAGE>
 
   
research by the firm. While reasonably competitive spreads or commissions are
sought, the Fund will not necessarily be paying the lowest spread or commission
available. The sale of shares of the Fund may be taken into consideration as a
factor in the selection of brokers or dealers to execute portfolio transactions
for the Fund. The portfolio securities of the Fund generally are traded on a
net basis and normally do not involve either brokerage commissions or transfer
taxes. The cost of portfolio securities transactions of the Fund primarily
consists of dealer or underwriter spreads. Under the 1940 Act, persons
affiliated with the Trust, including Merrill Lynch, are prohibited from dealing
with the Trust as a principal in the purchase and sale of securities unless
such trading is permitted by an exemptive order issued by the Commission. The
Trust has obtained an exemptive order permitting it to engage in certain
principal transactions with Merrill Lynch involving high quality short-term
municipal bonds subject to certain conditions. In addition, the Fund may not
purchase securities, including Municipal Bonds, during the existence of any
underwriting syndicate of which Merrill Lynch is a member or in a private
placement in which Merrill Lynch serves as placement agent except pursuant to
procedures approved by the Trustees of the Trust which either comply with rules
adopted by the Commission or with interpretations of the Commission staff. An
affiliated person of the Trust may serve as its broker in over-the-counter
transactions conducted for the Fund on an agency basis only.     
 
                            DISTRIBUTIONS AND TAXES
 
DISTRIBUTIONS
   
  The net investment income of the Fund is declared as dividends daily prior to
the determination of the net asset value which is calculated 15 minutes after
the close of business on the NYSE (generally, 4:00 p.m., New York time) on that
day. The net investment income of the Fund for dividend purposes consists of
interest earned on portfolio securities, less expenses, in each case computed
since the most recent determination of the net asset value. Expenses of the
Fund, including the management fees and the account maintenance and distribution
fees, are accrued daily. Dividends of net investment income are declared daily
and reinvested monthly in the form of additional full and fractional shares of
the Fund at net asset value as of the close of business on the "payment date"
unless the shareholder elects to receive such dividends in cash. Shares will
accrue dividends as long as they are issued and outstanding. Shares are issued
and outstanding from the settlement date of a purchase order to the day prior to
the settlement date of a redemption order.    
   
  All net realized capital gains, if any, are declared and distributed to the
Fund's shareholders at least annually. Capital gains distributions will be
reinvested automatically in shares unless the shareholder elects to receive
such distributions in cash.     
   
  The per share dividends and distributions on each class of shares will be
reduced as a result of any account maintenance, distribution and transfer
agency fees applicable to that class. See "Additional Information--
Determination of Net Asset Value."     
 
  See "Shareholder Services" for information as to how to elect either dividend
reinvestment or cash payments. Portions of dividends and distributions which
are taxable to shareholders as described below are subject to income tax
whether they are reinvested in shares of the Fund or received in cash.
 
 
                                       37
<PAGE>
 
TAXES
   
  The Trust intends to continue to qualify the Fund for the special tax
treatment afforded regulated investment companies ("RICs") under the Code. As
long as it so qualifies, 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 Trust intends to cause
the Fund to distribute substantially all of such income. So long as the Fund
qualifies as a regulated investment company under the Code, it will not be
subject to any Massachusetts income tax.     
   
  To the extent that the dividends distributed to the Fund's Class A, Class B,
Class C and Class D shareholders (together, the "shareholders") are derived
from interest income exempt from Federal tax under Code Section 103(a) and are
properly designated as "exempt-interest dividends" by the Trust, 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 benefits and railroad retirement benefits
subject to Federal income taxes. The portion of such exempt-interest dividends
properly identified in a year-end statement as directly attributable to
interest on Massachusetts Municipal Bonds ("Massachusetts exempt-interest
dividends") also will be exempt from Massachusetts personal income taxes.
Corporate shareholders and shareholders subject to income taxation by states
other than Massachusetts will realize a lower after-tax rate of return than
individual Massachusetts shareholders since the dividends distributed by the
Fund generally will not be exempt, to any significant degree, from the
Massachusetts corporate excise tax or from income taxation by such other
states. The Trust will inform shareholders annually as to the portion of the
Fund's distributions which constitutes exempt-interest dividends and the
portion which is exempt from Massachusetts personal income taxes. Interest on
indebtedness incurred or continued to purchase or carry Fund shares is not
deductible for Federal income tax or Massachusetts corporate excise tax
purposes, to the extent attributable to exempt-interest dividends, and is not
deductible for Massachusetts personal income tax purposes to the extent
attributable to Massachusetts exempt-interest dividends. Persons who may be
"substantial users" (or "related persons" of substantial users) of facilities
financed by industrial development bonds or private activity bonds held by the
Fund should consult their tax advisors before purchasing Fund shares.     
       
  Exempt-interest and capital gain dividends paid to a corporate shareholder
will be subject to Massachusetts corporate excise tax, and the value of the
shares of the Fund may be taken into account in calculating the property
component of such tax.
   
  Distributions from investment income and capital gains of the Fund, including
exempt-interest dividends, may also be subject to state taxes in states other
than Massachusetts and may be subject to local taxes. Accordingly, investors in
the Fund should consult their tax advisors with respect to the application of
such taxes to the receipt of Fund dividends and to the holding of shares in 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 taxable ordinary income for Federal income tax purposes and taxable
dividend income for Massachusetts 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
 
                                       38
<PAGE>
 
   
purposes, regardless of the length of time the shareholder has owned Fund
shares and, for Massachusetts income tax purposes, are taxed as capital gain
income, unless they are attributable to the sale of certain Massachusetts
Municipal Bonds issued pursuant to legislation that specifically exempts
capital gains on their sale from Massachusetts personal income taxation. Recent
legislation creates additional categories of capital gains taxable at different
rates for federal income tax purposes; there also are different long-term
capital gains rates for Massachusetts personal income tax purposes. Although
the federal legislation does not explain how gain in these categories will be
taxed to shareholders of RICs, it authorizes regulations applying the new
categories of gain and the new rates to sales of securities by RICs. In the
absence of guidance, there is some uncertainty as to the manner in which the
categories of gain and related rates will be passed through to shareholders in
capital gain dividends. It is anticipated that IRS guidance permitting
categories of gain and related rates to be passed through to shareholders would
also require the Fund to designate the amounts of various categories of capital
gain income included in capital gain dividends in a written notice sent to
shareholders. For Massachusetts personal income tax purposes, proposed
regulations have been issued that would, if finalized, permit different classes
of capital gains to be passed through to RIC shareholders. Distributions by the
Fund, whether from exempt-interest income, ordinary income or capital gains,
will not be 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 Fund and
received by its shareholders on December 31 of the year in which such dividend
was declared.
   
  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 certain "private activity bonds" issued after August 7,
1986. Private activity bonds are bonds which, although tax-exempt, are used for
purposes other than those generally performed by governmental units and which
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 certain investors in such bonds,
including shareholders of the Fund, to an alternative minimum tax. The Fund
will purchase such "private activity bonds," and the Trust will report to
shareholders within 60 days after the Fund's taxable year-end the portion of
the Fund's 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 alternative minimum tax on exempt-
interest dividends paid by the Fund.     
 
                                       39
<PAGE>
 
  No gain or loss will be recognized by Class B shareholders on the conversion
of their Class B shares into Class D shares. A shareholder's basis in the Class
D shares acquired will be the same as such shareholder's basis in the Class B
shares converted, and the holding period of the acquired Class D shares will
include the holding period for the converted Class B shares.
 
  If a shareholder exercises an exchange privilege within 90 days of acquiring
the shares, then the loss the shareholder can recognize on the exchange will be
reduced (or the gain increased) to the extent any sales charge paid to the Fund
on the exchanged shares reduces any sales charge such shareholder would have
owed upon purchase of the new shares in the absence of the exchange privilege.
Instead, such sales charge will be treated as an amount paid for the new
shares.
 
  A loss realized on a sale or exchange of shares of the Fund will be
disallowed if other Fund shares are acquired (whether through the automatic
reinvestment of dividends or otherwise) within a 61-day period beginning 30
days before and ending 30 days after the date that the shares are disposed of.
In such a case, the basis of the shares acquired will be adjusted to reflect
the disallowed loss.
 
  Under certain Code provisions, some shareholders 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 will be those for whom no certified
taxpayer identification number is on file with the Trust or who, to the Trust'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.
   
  The foregoing is a general and abbreviated summary of the applicable
provisions of the Code, Treasury regulations and Massachusetts tax laws
presently in effect. For the complete provisions, reference should be made to
the pertinent Code sections, the Treasury regulations promulgated thereunder
and the applicable Massachusetts personal income and corporate excise tax laws
and regulations. The Code and the Treasury regulations, as well as the
Massachusetts tax laws, are subject to change by legislative, judicial or
administrative action either prospectively or retroactively.     
 
  Shareholders are urged to consult their tax advisors regarding the
availability of any exemptions from state or local taxes (other than those
imposed by Massachusetts) and with specific questions as to Federal, foreign,
state or local taxes.
 
                                PERFORMANCE DATA
 
  From time to time the Fund may include its average annual total return, yield
and tax-equivalent yield for various specified time periods in advertisements
or information furnished to present or prospective shareholders. Average annual
total return, yield and tax-equivalent yield are computed separately for
Class A, Class B, Class C and Class D shares in accordance with formulas
specified by the Commission.
 
                                       40
<PAGE>
 
  Average annual total return quotations for the specified periods will be
computed by finding the average annual compounded rates of return (based on net
investment income and any realized and unrealized capital gains or losses on
portfolio investments over such periods) that would equate the initial amount
invested to the redeemable value of such investment at the end of each period.
Average annual total return will be computed assuming all dividends and
distributions are reinvested and taking into account all applicable recurring
and nonrecurring expenses, including any CDSC that would be applicable to a
complete redemption of the investment at the end of the specified period such
as in the case of Class B and Class C shares and the maximum sales charge in
the case of Class A and Class D shares. Dividends paid by the Fund with respect
to all shares, to the extent any dividends are paid, will be calculated in the
same manner at the same time on the same day and will be in the same amount,
except that account maintenance and distribution charges and any incremental
transfer agency costs relating to each class of shares will be borne
exclusively by that class. The Fund will include performance data for all
classes of shares of the Fund in any advertisement or information including
performance data of the Fund.
   
  The Fund also may quote total return and aggregate total return performance
data for various specified time periods. Such data will be calculated
substantially as described above, except that (1) the rates of return
calculated will not be average annual rates, but rather, actual annual,
annualized or aggregate rates of return and (2) the maximum applicable sales
charges will not be included with respect to annual or annualized rates of
return calculations. Aside from the impact on the performance data calculations
of including or excluding the maximum applicable sales charges, actual annual
or annualized total return data generally will be lower than average annual
total return data since the average annual rates of return reflect compounding;
aggregate total return data generally will be higher than average annual total
return data since the aggregate rates of return reflect compounding over a
longer period of time. In advertisements distributed to investors whose
purchases are subject to waiver of the CDSC in the case of Class B and Class C
shares or reduced sales charges in the case of Class A and Class D shares, the
performance data may take into account the reduced, and not the maximum, sales
charge or may not take into account the CDSC and therefore may reflect greater
total return since, due to the reduced sales charges or waiver of the CDSC, a
lower amount of expenses is deducted. See "Purchase of Shares." The Fund's
total return may be expressed either as a percentage or as a dollar amount in
order to illustrate such total return on a hypothetical $1,000 investment in
the Fund at the beginning of each specified period.     
   
  Yield quotations will be computed based on a 30-day period by dividing (a)
the net income based on the yield of each security earned during the period by
(b) the average daily number of shares outstanding during the period that were
entitled to receive dividends multiplied by the maximum offering price per
share on the last day of the period. 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 yield for the 30-day period ended
July 31, 1997 was 4.51% for Class A shares, 4.20% for Class B shares, 4.11% for
Class C shares and 4.42% for Class D shares and the tax-equivalent yield for
the same period (based on a Federal income tax rate of 28%) was 6.26% for Class
A shares, 5.83% for Class B shares, 5.71% for Class C shares and 6.14% for
Class D shares.     
 
  Total return, yield and tax-equivalent yield figures are based on the Fund's
historical performance and are not intended to indicate future performance. The
Fund's total return, yield and tax-equivalent yield will vary depending on
market conditions, the securities comprising the Fund's portfolio, the Fund's
operating
 
                                       41
<PAGE>
 
expenses and the amount of realized and unrealized net capital gains or losses
during the period. The value of an investment in the Fund will fluctuate and an
investor's shares, when redeemed, may be worth more or less than their original
cost.
 
  On occasion, the Fund may compare its performance to performance data
published by Lipper Analytical Services, Inc., Morningstar Publications, Inc.
("Morningstar"), and CDA Investment Technology, Inc. or to data contained in
publications such as Money Magazine, U.S. News & World Report, Business Week,
Forbes Magazine and Fortune Magazine. From time to time, the Fund may include
the Fund's Morningstar risk-adjusted performance ratings in advertisements or
supplemental sales literature. As with other performance data, performance
comparisons should not be considered indicative of the Fund's relative
performance for any future period.
 
                             ADDITIONAL INFORMATION
 
DETERMINATION OF NET ASSET VALUE
   
  The net asset value of the shares of all classes of the Fund is determined by
the Manager once daily 15 minutes after the close of business on the NYSE
(generally, 4:00 p.m., New York time), on each day during which the NYSE is
open for trading. The net asset value per share is computed by dividing the sum
of the value of the securities held by the Fund plus any cash or other assets
(including interest and dividends accrued but not yet received) minus all
liabilities (including accrued expenses) by the total number of shares
outstanding at such time, rounded to the nearest cent. Expenses, including the
fees payable to the Manager and the Distributor, are accrued daily.     
 
  The per share net asset value of the Class A shares will generally be higher
than the per share net asset value of shares of the other classes, reflecting
the daily expense accruals of the account maintenance, distribution and higher
transfer agency fees applicable with respect to Class B and Class C shares and
the daily expense accruals of the account maintenance fees applicable with
respect to Class D shares; moreover, the per share net asset value of Class D
shares generally will be higher than the per share net asset value of Class B
and Class C shares, reflecting the daily expense accruals of the distribution
fees, higher account maintenance fees and higher transfer agency fees
applicable with respect to Class B and Class C shares. It is expected, however,
that the per share net asset value of the classes will tend to converge
(although not necessarily meet) immediately after the payment of dividends or
distributions which will differ by approximately the amount of the expense
accrual differentials between the classes.
 
ORGANIZATION OF THE TRUST
   
  The Trust is a business trust organized on August 2, 1985 under the laws of
Massachusetts. On October 1, 1987, the Trust changed its name from "Merrill
Lynch Multi-State Tax-Exempt Series Trust" to "Merrill Lynch Multi-State
Municipal Bond Series Trust," and on December 22, 1987 the Trust again changed
its name to "Merrill Lynch Multi-State Municipal Series Trust." The Trust is an
open-end management investment company comprised of separate series ("Series"),
each of which is a separate portfolio offering shares to selected groups of
purchasers. Each of the Series is managed independently in order to provide to
shareholders who are residents of the state to which such Series relates as
high a level of income exempt from Federal and, in certain cases, state and
local income taxes as is consistent with prudent investment     
 
                                       42
<PAGE>
 
   
management. The Trustees are authorized to create an unlimited number of Series
and, with respect to each Series, to issue an unlimited number of full and
fractional shares of beneficial interest, $.10 par value per share, of
different classes. Shareholder approval is not required for the authorization
of additional Series or classes of a Series of the Trust. At the date of this
Prospectus, the shares of the Fund are divided into Class A, Class B, Class C
and Class D shares. Class A, Class B, Class C and Class D shares represent
interests in the same assets of the Fund and are identical in all respects
except that Class B, Class C and Class D shares bear certain expenses relating
to the account maintenance associated with such shares, and Class B and Class C
shares bear certain expenses relating to the distribution of such shares. Each
class has exclusive voting rights with respect to matters relating to
distribution and/or account maintenance expenditures, as applicable. See
"Purchase of Shares." The Trustees of the Trust may classify and reclassify the
shares of any Series into additional or other classes at a future date.     
   
  Shareholders are entitled to one vote for each full share and to fractional
votes for fractional shares held in the election of Trustees (to the extent
hereinafter provided) and on other matters submitted to the vote of
shareholders. There normally will be no meeting of shareholders for the purpose
of electing Trustees unless and until such time as less than a majority of the
Trustees holding office have been elected by shareholders, at which time the
Trustees then in office will call a shareholders' meeting for the election of
Trustees. Shareholders may, in accordance with the terms of the Declaration of
Trust, cause a meeting of shareholders to be held for the purpose of voting on
the removal of Trustees. Also, the Trust will be required to call a special
meeting of shareholders of a Series in accordance with the requirements of the
1940 Act to seek approval of new management and advisory arrangements, of a
material increase in distribution fees or of a change in the fundamental
policies, objectives or restrictions of a Series. Except as set forth above,
the Trustees shall continue to hold office and appoint successor Trustees. Upon
liquidation or dissolution of a Series, each issued and outstanding share is
entitled to participate equally in dividends and distributions declared by the
respective Series and in net assets of such Series remaining after satisfaction
of outstanding liabilities except that, as noted above, Class B, Class C and
Class D shares bear certain additional expenses. The obligations and
liabilities of a particular Series are restricted to the assets of that Series
and do not extend to the assets of the Trust generally. The shares of each
Series, when issued, will be fully-paid and non-assessable by the Trust.     
       
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:
 
   Merrill Lynch Financial Data Services, Inc. 
   P.O. Box 45289 
   Jacksonville, FL 32232-5289
 
  The written notification should include the shareholder's name, address, tax
identification number and Merrill Lynch, Pierce, Fenner & Smith Incorporated
and/or mutual fund account numbers. If you have any questions regarding this
matter please call your Merrill Lynch Financial Consultant or Merrill Lynch
Financial Data Services, Inc. at 800-637-3863.
 
                                       43
<PAGE>
 
SHAREHOLDER INQUIRIES
 
  Shareholder inquiries may be addressed to the Trust at the address or
telephone number set forth on the cover page of this Prospectus.
 
                               ----------------
 
  The Declaration of Trust establishing the Trust, dated August 2, 1985, a copy
of which together with all amendments thereto (the "Declaration"), is on file
in the office of the Secretary of the Commonwealth of Massachusetts, provides
that the name "Merrill Lynch Multi-State Municipal Series Trust" refers to the
Trustees under the Declaration collectively as Trustees, but not as individuals
or personally; and no Trustee, shareholder, officer, employee or agent of the
Trust shall be held to any personal liability, nor shall resort be had to such
person's private property for the satisfaction of any obligation or claim of
the Trust, but the "Trust Property" only shall be liable.
 
                                       44
<PAGE>
 
MERRILL LYNCH MASSACHUSETTS MUNICIPAL BOND FUND -- AUTHORIZATION FORM (PART 1)
- -------------------------------------------------------------------------------
1. SHARE PURCHASE APPLICATION
  I, being of legal age, wish to purchase: (choose one)
 [_] Class A shares  [_] Class B shares  [_] Class C shares  [_] Class D shares
 
of Merrill Lynch Massachusetts Municipal Bond Fund and establish an Investment
Account as described in the Prospectus. In the event that I am not eligible to
purchase Class A shares, I understand that Class D shares will be purchased.
 
  Basis for establishing an Investment Account:
    A. I enclose a check for $............ payable to Merrill Lynch Financial
  Data Services, Inc., as an initial investment (minimum $1,000). I understand
  that this purchase will be executed at the applicable offering price next to
  be determined after this Application is received by you.
    B. I already own shares of the following Merrill Lynch mutual funds that
  would qualify for the right of accumulation as outlined in the Statement of
  Additional Information: (Please list all funds. Use a separate sheet of
  paper if necessary.)
1. ..................................    4. ..................................
2. ..................................    5. ..................................
3. ..................................    6. ..................................
Name...........................................................................
  First Name                        Initial                        Last Name
Name of Co-Owner (if any)......................................................
                First Name                 Initial                 Last Name
Address........................................................................
 ................................................. Date........................
                                     (Zip Code)
Occupation...........................    Name and Address of Employer ........
                                         .....................................
                                         .....................................
 .....................................    .....................................
         Signature of Owner                 Signature of Co-Owner (if any)
(In the case of co-owners, a joint tenancy with right of survivorship will be
presumed unless otherwise specified.)
- -------------------------------------------------------------------------------
2. DIVIDEND AND CAPITAL GAIN DISTRIBUTION OPTIONS
 
                                          Long-Term Capital 
Ordinary Income Dividends                 Gains
                                                        
     SELECT ONE: [_] Reinvest             SELECT ONE: [_] Reinvest
                 [_] Cash                             [_] Cash
                          
If no election is made, dividends and capital gains will be automatically
reinvested at net asset value without a sales charge.
IF CASH, SPECIFY HOW YOU WOULD LIKE YOUR DISTRIBUTIONS PAID TO YOU: [_] Check
or [_] Direct Deposit to bank account
IF DIRECT DEPOSIT TO BANK ACCOUNT IS SELECTED, PLEASE COMPLETE BELOW:
I hereby authorize payment of dividend and capital gain distributions by
direct deposit to my bank account and, if necessary, debit entries and
adjustments for any credit entries made to my account in accordance with the
terms I have selected on the Merrill Lynch Massachusetts Municipal Bond Fund
Authorization Form.
 
Specify type of account (check one): [_] checking  [_] savings
 
Name on your account ..........................................................
 
Bank Name .....................................................................
 
Bank Number ...................... Account Number ............................
 
Bank Address ..................................................................
 
I AGREE THAT THIS AUTHORIZATION WILL REMAIN IN EFFECT UNTIL I PROVIDE WRITTEN
NOTIFICATION TO MERRILL LYNCH FINANCIAL DATA SERVICES, INC. AMENDING OR
TERMINATING THIS SERVICE.
 
Signature of Depositor ........................................................
 
Signature of Depositor ............................... Date...................
(if joint account, both must sign)
NOTE: IF DIRECT DEPOSIT TO BANK ACCOUNT IS SELECTED, YOUR BLANK, UNSIGNED
CHECK MARKED "VOID" OR A DEPOSIT SLIP FROM YOUR SAVINGS ACCOUNT SHOULD
ACCOMPANY THIS APPLICATION.
 
                                      45
<PAGE>
 
  MERRILL LYNCH MASSACHUSETTS MUNICIPAL BOND FUND -- AUTHORIZATION FORM (PART
                               1) -- (CONTINUED)
- -------------------------------------------------------------------------------
3. SOCIAL SECURITY NUMBER OR TAXPAYER IDENTIFICATION NUMBER
           
            [                                           ]
           Social Security Number or Taxpayer Identification Number
 
  Under penalty of perjury, I certify (1) that the number set forth above is
my correct Social Security Number or Taxpayer Identification Number and (2)
that I am not subject to backup withholding (as discussed in the Prospectus
under "Distribution and Taxes--Taxes") either because I have not been notified
that I am subject thereto as a result of a failure to report all interest or
dividends, or the Internal Revenue Service ("IRS") has notified me that I am
no longer subject thereto.
 
  INSTRUCTION: YOU MUST STRIKE OUT THE LANGUAGE IN (2) ABOVE IF YOU HAVE BEEN
NOTIFIED THAT YOU ARE SUBJECT TO BACKUP WITHHOLDING DUE TO UNDER-REPORTING AND
IF YOU HAVE NOT RECEIVED A NOTICE FROM THE IRS THAT BACKUP WITHHOLDING HAS
BEEN TERMINATED. THE UNDERSIGNED AUTHORIZES THE FURNISHING OF THIS
CERTIFICATION TO OTHER MERRILL LYNCH SPONSORED MUTUAL FUNDS.
 
 .......................................     ...................................
          Signature of Owner                  Signature of Co-Owner (if any)
- -------------------------------------------------------------------------------
4. LETTER OF INTENTION--CLASS A AND CLASS D SHARES ONLY (SEE TERMS AND
CONDITIONS IN THE STATEMENT OF ADDITIONAL INFORMATION)
 
                                                    ................., 19......
Dear Sir/Madam:                                      Date of Initial Purchase
 
  Although I am not obligated to do so, I intend to purchase shares of Merrill
Lynch Massachusetts Municipal Bond Fund or any other investment company with
an initial sales charge or deferred sales charge for which Merrill Lynch Funds
Distributor, Inc. acts as distributor over the next 13-month period which will
equal or exceed:
 
 [_] $25,000    [_] $50,000    [_] $100,000    [_] $250,000    [_] $1,000,000
  Each purchase will be made at the then reduced offering price applicable to
the amount checked above, as described in the Merrill Lynch Massachusetts
Municipal Bond Fund Prospectus.
 
  I agree to the terms and conditions of this Letter of Intention. I hereby
irrevocably constitute and appoint Merrill Lynch Funds Distributor, Inc., my
attorney, with full power of substitution, to surrender for redemption any or
all shares of Merrill Lynch Massachusetts Municipal Bond Fund held as
security.
 
By: ...................................     ...................................
         Signature of Owner                        Signature of Co-Owner
                                  (If registered in joint names, both must sign)
  In making purchases under this letter, the following are the related
accounts on which reduced offering prices are to apply:
 
(1) Name...............................     (2) Name...........................
                                            Account Number.....................
Account Number.........................
- -------------------------------------------------------------------------------
 
5. FOR DEALER ONLY
     Branch Office, Address, Stamp          We hereby authorize Merrill Lynch
                                            Funds Distributor, Inc. to act as
- --                              --          our agent in connection with
                                            transactions under this
- --                              --          authorization form and agree to
This form when completed, should be         notify the Distributor of any
mailed to:                                  purchases or sales made under a
  Merrill Lynch Massachusetts Municipal     Letter of Intention, Automatic
   Bond Fund                                Investment Plan or Systematic
  c/o Merrill Lynch Financial               Withdrawal Plan. We guarantee the
   Data Services, Inc.                      shareholder's signature.
  P.O. Box 45289                       
  Jacksonville, FL 32232-5289          
                                            ...................................
                                                  Dealer Name and Address
 
                                            By: ...............................
                                              Authorized Signature of Dealer
 
                                            
                                                                 ............
                                  [ ][ ][ ]    [ ][ ][ ][ ]      F/C Last Name
                                   Branch Code    F/C No.
                                            
                                            [ ][ ][ ] [ ][ ][ ][ ][ ]
                                            Dealer's Customer A/C No.
 
                                      46
<PAGE>
 
MERRILL LYNCH MASSACHUSETTS MUNICIPAL BOND FUND -- AUTHORIZATION FORM (PART 2)
- -------------------------------------------------------------------------------
 
NOTE: THIS FORM IS REQUIRED TO APPLY FOR THE SYSTEMATIC WITHDRAWAL OR
AUTOMATIC INVESTMENT PLANS ONLY.
- -------------------------------------------------------------------------------
 
1. ACCOUNT REGISTRATION
(Please Print)                              -------------------------------
                                            -------------------------------
Name of Owner...........................       Social Security No. or
          First Name  Initial  Last Name      Taxpayer Identification
                                                     Number
 
Name of Co-Owner (if any)...............
          First Name  Initial  Last Name
 
Address.................................   Account Number ....................
                                           (if existing account)
 ........................................
                              (Zip Code)
- -------------------------------------------------------------------------------
   
2. SYSTEMATIC WITHDRAWAL PLAN (SEE TERMS AND CONDITIONS IN THE STATEMENT OF
ADDITIONAL INFORMATION)     
   
MINIMUM REQUIREMENTS: $10,000 for monthly disbursements, $5,000 for quarterly,
of [_] Class A, [_] Class B*, [_] Class C* or [_] Class D shares in Merrill
Lynch Massachusetts Municipal Bond Fund at cost or current offering price.
Withdrawals to be made either (check one) [_] Monthly on the 24th day of each
month, or [_] Quarterly on the 24th day of March, June, September and
December. If the 24th falls on a weekend or holiday, the next succeeding
business day will be utilized. Begin systematic withdrawal on ________________
or as soon as possible thereafter.                                (month)

   
SPECIFY THE AMOUNT OF THE WITHDRAWAL YOU WOULD LIKE PAID TO YOU (CHECK ONE):
[_] $      of [_] Class A, [_] Class B*, [_] Class C* or [_] Class D shares in
the account.     
 
SPECIFY WITHDRAWAL METHOD: [_] check or [_] direct deposit to bank account
(check one and complete part (a) or (b) below):
 
DRAW CHECKS PAYABLE (CHECK ONE)
 
(a) I hereby authorize payment by check
  [_] as indicated in Item 1.
  [_] to the order of..........................................................
 
Mail to (check one)
  [_] the address indicated in Item 1.
  [_] Name (Please Print)......................................................
 
Address .......................................................................
 
   ..........................................................................
 
   Signature of Owner................................   Date..................
 
   Signature of Co-Owner (if any)............................................
 
(b) I HEREBY AUTHORIZE PAYMENT BY DIRECT DEPOSIT TO BANK ACCOUNT AND, IF
NECESSARY, DEBIT ENTRIES AND ADJUSTMENTS FOR ANY CREDIT ENTRIES MADE TO MY
ACCOUNT. I AGREE THAT THIS AUTHORIZATION WILL REMAIN IN EFFECT UNTIL I PROVIDE
WRITTEN NOTIFICATION TO MERRILL LYNCH FINANCIAL DATA SERVICES, INC. AMENDING
OR TERMINATING THIS SERVICE.
 
Specify type of account (check one): [_] checking [_] savings
 
Name on your Account...........................................................
 
Bank Name......................................................................
 
Bank Number........................ Account Number............................
 
Bank Address...................................................................
 
     ........................................................................
 
Signature of Depositor................................. Date..................
 
Signature of Depositor.........................................................
(If joint account, both must sign)
 
NOTE: IF DIRECT DEPOSIT IS ELECTED, YOUR BLANK, UNSIGNED CHECK MARKED "VOID"
OR A DEPOSIT SLIP FROM YOUR SAVINGS ACCOUNT SHOULD ACCOMPANY THIS APPLICATION.
- -------
   
* ANNUAL WITHDRAWAL CANNOT EXCEED 10% OF THE VALUE OF SHARES OF SUCH CLASS
  HELD IN THE ACCOUNT AT THE TIME THE ELECTION TO JOIN THE SYSTEMATIC
  WITHDRAWAL PLAN IS MADE.     
 
                                      47
<PAGE>
 
  MERRILL LYNCH MASSACHUSETTS MUNICIPAL BOND FUND -- AUTHORIZATION FORM (PART
                               2) -- (CONTINUED)
- -------------------------------------------------------------------------------
 
3. APPLICATION FOR AUTOMATIC INVESTMENT PLAN
 
  I hereby request that Merrill Lynch Financial Data Services, Inc. draw an
automated clearing house ("ACH") debit on my checking account as described
below each month to purchase: (choose one)
 
 [_] Class A shares  [_] Class B shares  [_] Class C shares [_] Class D shares
 
of Merrill Lynch Massachusetts Municipal Bond Fund subject to the terms set
forth below. In the event that I am not eligible to purchase Class A shares, I
understand that Class D shares will be purchased.
 
                                           AUTHORIZATION TO HONOR ACH DEBITS
    MERRILL LYNCH FINANCIAL DATA           DRAWN BY MERRILL LYNCH FINANCIAL
           SERVICES, INC.                         DATA SERVICES, INC.      
                                                                           
You are hereby authorized to draw an       To...............................Bank
ACH debit each month on my bank                          (Investor's Bank)      
account for investment in Merrill                                               
Lynch Massachusetts Municipal Bond         Bank Address.........................
Fund, as indicated below:                                                       
                                                                                
  Amount of each ACH debit $........       City...... State...... Zip Code......
                                                                                
  Account No. ......................                                            
                                           As a convenience to me, I hereby     
Please date and invest ACH debits on       request and authorize you to pay and 
the 20th of each month                     charge to my account ACH debits      
beginning_______or as soon thereafter      drawn on my account by and payable   
         (Month)                           to Merrill Lynch Financial Data      
as possible.                               Services, Inc. I agree that your     
                                           rights in respect to each such debit 
  I agree that you are drawing these       shall be the same as if it were a    
ACH debits voluntarily at my request       check drawn on you and signed        
and that you shall not be liable for       personally by me. This authority is  
any loss arising from any delay in         to remain in effect until revoked    
preparing or failure to prepare any        personally by me in writing. Until   
such debit. If I change banks or           you receive such notice, you shall   
desire to terminate or suspend this        be fully protected in honoring any   
program, I agree to notify you             such debit. I further agree that if  
promptly in writing. I hereby              any such debit be dishonored,        
authorize you to take any action to        whether with or without cause and    
correct erroneous ACH debits of my         whether intentionally or             
bank account or purchases of Fund          inadvertently, you shall be under no 
shares including liquidating shares        liability.
of the Fund and crediting my bank                                              
account. I further agree that if a         ............   .....................
debit is not honored upon                      Date           Signature of     
presentation, Merrill Lynch Financial                           Depositor      
Data Services, Inc. is authorized to                                           
discontinue immediately the Automatic      ............   .....................
Investment Plan and to liquidate               Bank      Signature of Depositor
sufficient shares held in my account         Account       (If joint account,  
to offset the purchase made with the          Number         both must sign)    
dishonored debit.                     
                                                                              
 
 ............    .....................
    Date            Signature of
                      Depositor
 
                ......................
               Signature of Depositor
                 (If joint account,
                   both must sign)
 
NOTE: IF AUTOMATIC INVESTMENT PLAN IS ELECTED, YOUR BLANK, UNSIGNED CHECK
MARKED "VOID" SHOULD ACCOMPANY THIS APPLICATION.
 
                                      48
<PAGE>
 
                      
                   [THIS PAGE INTENTIONALLY LEFT BLANK]     
<PAGE>
 
                      
                   [THIS PAGE INTENTIONALLY LEFT BLANK]     
<PAGE>
 
                                    MANAGER
 
                             Fund Asset Management
 
                            Administrative Offices:
                             800 Scudders Mill Road
                             Plainsboro, New Jersey
 
                                Mailing Address:
                                 P.O. Box 9011
                        Princeton, New Jersey 08543-9011
 
                                  DISTRIBUTOR
 
                     Merrill Lynch Funds Distributor, Inc.
 
                            Administrative Offices:
                             800 Scudders Mill Road
                             Plainsboro, New Jersey
 
                                Mailing Address:
                                 P.O. Box 9081
                        Princeton, New Jersey 08543-9081
 
                                   CUSTODIAN
 
                      State Street Bank and Trust Company
                                  P.O. Box 351
                          Boston, Massachusetts 02101
 
                                 TRANSFER AGENT
 
                  Merrill Lynch Financial Data Services, Inc.
 
                            Administrative Offices:
                           4800 Deer Lake Drive East
                        Jacksonville, Florida 32246-6484
 
                                Mailing Address:
                                 P.O. Box 45289
                        Jacksonville, Florida 32232-5289
 
                              INDEPENDENT AUDITORS
 
                             Deloitte & Touche LLP
                                117 Campus Drive
                        Princeton, New Jersey 08540-6400
 
                                    COUNSEL
 
                                Brown & Wood LLP
                             One World Trade Center
                         New York, New York 10048-0557
<PAGE>
 
 NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS, OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, IN CONNECTION
WITH THE OFFER CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN OR MADE, SUCH OTHER
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE TRUST, THE MANAGER OR THE DISTRIBUTOR. THIS PROSPECTUS DOES
NOT CONSTITUTE AN OFFERING IN ANY STATE IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.
 
                              -------------------
 
                               TABLE OF CONTENTS
<TABLE>   
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Fee Table..................................................................   2
Merrill Lynch Select Pricing SM System.....................................   4
Financial Highlights.......................................................   8
Investment Objective and Policies..........................................  11
 Potential Benefits........................................................  13
 Special and Risk Considerations Relating to Municipal Bonds...............  13
 Description of Municipal Bonds............................................  14
 Call Rights...............................................................  17
 When-Issued Securities and Delayed Delivery Transactions..................  17
 Financial Futures Transactions and Options................................  17
 Repurchase Agreements.....................................................  19
 Investment Restrictions...................................................  20
Management of the Trust....................................................  21
 Trustees..................................................................  21
 Management and Advisory Arrangements......................................  21
 Code of Ethics............................................................  22
 Transfer Agency Services..................................................  22
Purchase of Shares.........................................................  23
 Initial Sales Charge Alternatives--Class A and Class D Shares.............  25
 Deferred Sales Charge Alternatives--Class B and Class C Shares............  26
 Distribution Plans........................................................  29
 Limitations on the Payment of Deferred Sales Charges......................  31
Redemption of Shares.......................................................  32
 Redemption................................................................  32
 Repurchase................................................................  32
 Reinstatement Privilege--Class A and Class D Shares.......................  33
Shareholder Services.......................................................  33
 Investment Account........................................................  33
 Exchange Privilege........................................................  34
 Automatic Reinvestment of Dividends and Capital Gains Distributions.......  35
 Systematic Withdrawal Plans...............................................  35
 Automatic Investment Plans................................................  36
 Fee-Based Programs........................................................  36
Portfolio Transactions.....................................................  36
Distributions and Taxes....................................................  37
 Distributions.............................................................  37
 Taxes.....................................................................  38
Performance Data...........................................................  40
Additional Information.....................................................  42
 Determination of Net Asset Value..........................................  42
 Organization of the Trust.................................................  42
 Shareholder Reports.......................................................  43
 Shareholder Inquiries.....................................................  44
Authorization Form.........................................................  45
</TABLE>    
                                                                    
                                                                Code #16148-1097
                                                                     
[LOGO] MERRILL LYNCH

Merrill Lynch
Massachusetts Municipal
Bond Fund
Merrill Lynch Multi-State
Municipal Series Trust

[ART]

PROSPECTUS
    
October 28, 1997      

Distributor:
Merrill Lynch
Funds Distributor, Inc.

This prospectus should be retained for future reference.
 
 
 
<PAGE>
 
STATEMENT OF ADDITIONAL INFORMATION
 
                MERRILL LYNCH MASSACHUSETTS MUNICIPAL BOND FUND
                MERRILL LYNCH MULTI-STATE MUNICIPAL SERIES TRUST
   P.O. BOX 9011, PRINCETON, NEW JERSEY 08543-9011 . PHONE NO. (609) 282-2800
 
                               ----------------
   
  Merrill Lynch Massachusetts Municipal Bond Fund (the "Fund") is a series of
Merrill Lynch Multi-State Municipal Series Trust (the "Trust"), an open-end
management investment company organized as a Massachusetts business trust. The
investment objective of the Fund is to provide shareholders with as high a
level of income exempt from Federal and Massachusetts personal income taxes as
is consistent with prudent investment management. The Fund invests primarily in
a non-diversified portfolio of long-term investment grade obligations issued by
or on behalf of The Commonwealth of Massachusetts, its political subdivisions,
agencies and instrumentalities and obligations of other qualifying issuers,
such as issuers located in Puerto Rico, the U.S. Virgin Islands and Guam, which
pay interest exempt from Federal and Massachusetts income taxes. There can be
no assurance that the investment objective of the Fund will be realized.     
 
  Pursuant to the Merrill Lynch Select PricingSM System, the Fund offers four
classes of shares, each with a different combination of sales charges, ongoing
fees and other features. The Merrill Lynch Select PricingSM System permits an
investor to choose the method of purchasing shares that the investor believes
is most beneficial given the amount of the purchase, the length of time the
investor expects to hold the shares and other relevant circumstances.
 
                               ----------------
   
  The Statement of Additional Information of the Fund is not a prospectus and
should be read in conjunction with the prospectus of the Fund, dated October
28, 1997 (the "Prospectus"), which has been filed with the Securities and
Exchange Commission (the "Commission") and can be obtained, without charge, by
calling or by writing the Fund at the above telephone number or address. This
Statement of Additional Information has been incorporated by reference into the
Prospectus. Capitalized terms used but not defined herein have the same
meanings as in the Prospectus.     
 
                               ----------------
 
                        FUND ASSET MANAGEMENT -- MANAGER
 
              MERRILL LYNCH FUNDS DISTRIBUTOR, INC. -- DISTRIBUTOR
 
                               ----------------
    
 The date of this Statement of Additional Information is October 28, 1997.     
<PAGE>
 
                       INVESTMENT OBJECTIVE AND POLICIES
   
  The investment objective of the Fund is to provide shareholders with as high
a level of income exempt from Federal and Massachusetts personal income taxes
as is consistent with prudent investment management. The Fund seeks to achieve
its objective by investing primarily in a portfolio of long-term obligations
issued by or on behalf of The Commonwealth of Massachusetts, its political
subdivisions, agencies and instrumentalities and obligations of other
qualifying issuers, such as issuers located in Puerto Rico, the U.S. Virgin
Islands and Guam, which pay interest exempt, in the opinion of bond counsel to
the issuer, from Federal and Massachusetts personal income taxes. Obligations
exempt from Federal income taxes are referred to herein as "Municipal Bonds"
and obligations exempt from both Federal and Massachusetts personal income
taxes are referred to as "Massachusetts Municipal Bonds." Unless otherwise
indicated, references to Municipal Bonds shall be deemed to include
Massachusetts Municipal Bonds. The Fund anticipates that at all times, except
during temporary defensive periods, it will maintain at least 65% of its total
assets invested in Massachusetts Municipal Bonds. At times, the Fund will seek
to hedge its portfolio through the use of futures transactions to reduce
volatility in the net asset value of Fund shares. Reference is made to
"Investment Objective and Policies" in the Prospectus for a discussion of the
investment objective and policies of the Fund.     
   
  Municipal Bonds may include general obligation bonds of the State and its
political subdivisions, revenue bonds to finance utility systems, highways,
bridges, port and airport facilities, colleges, hospitals, housing facilities,
etc., and industrial development bonds or private activity bonds. The interest
on such obligations may bear a fixed rate or be payable at a variable or
floating rate. The Municipal Bonds purchased by the Fund will be primarily what
are commonly referred to as "investment grade" securities, which are
obligations rated at the time of purchase within the four highest quality
ratings as determined by either Moody's Investors Service, Inc. ("Moody's")
(currently Aaa, Aa, A and Baa), Standard & Poor's Ratings Services ("Standard &
Poor's") (currently AAA, AA, A and BBB) or Fitch Investors Service, Inc.
("Fitch") (currently AAA, AA, A and BBB). If unrated, such securities will
possess creditworthiness comparable, in the opinion of the manager of the Fund,
Fund Asset Management, L.P. (the "Manager"), to other obligations in which the
Fund may invest.     
   
  The Fund ordinarily does not intend to realize investment income not exempt
from Federal and Massachusetts income taxes. However, to the extent that
suitable Massachusetts Municipal Bonds are not available for investment by the
Fund, the Fund may purchase Municipal Bonds issued by other states, their
agencies and instrumentalities, the interest income on which is exempt, in the
opinion of bond counsel to the issuer, from Federal but not Massachusetts
taxation. 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 to be 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 permitted by applicable law. Other Non-Municipal
Tax-Exempt Securities could include trust certificates or other instruments
evidencing interests in one or more long-term municipal securities.     
 
  Except when acceptable securities are unavailable as determined by the
Manager, the Fund, under normal circumstances, will invest at least 65% of its
total assets in Massachusetts Municipal Bonds. For temporary periods or to
provide liquidity, the Fund has the authority to invest as much as 35% of its
assets
 
                                       2
<PAGE>
 
   
in tax-exempt or taxable money market obligations with a maturity of one year
or less (such short-term obligations being referred to herein as "Temporary
Investments"), except that taxable Temporary Investments shall not exceed 20%
of the Fund's net assets. The Fund at all times will have at least 80% of its
net assets invested in securities exempt from Federal income taxation. However,
interest received on certain otherwise tax-exempt securities which are
classified as "private activity bonds" (in general bonds that benefit non-
governmental entities) may be subject to an alternative minimum tax. The Fund
may purchase such private activity bonds. See "Distributions and Taxes." In
addition, the Fund reserves the right to invest temporarily a greater portion
of its assets in Temporary Investments for defensive purposes, when, in the
judgment of the Manager, market conditions warrant. The investment objective of
the Fund set forth in this paragraph is a fundamental policy of the Fund which
may not be changed without a vote of a majority of the outstanding shares of
the Fund. The Fund's hedging strategies are not fundamental policies and may be
modified by the Trustees of the Trust without the approval of the Fund's
shareholders.     
 
  Municipal Bonds may at times be purchased or sold on a delayed delivery basis
or a when-issued basis. These transactions arise when securities are purchased
or sold by the Fund with payment and delivery taking place in the future, often
a month or more after the purchase. The payment obligation and the interest
rate are each fixed at the time the buyer enters into the commitment. The Fund
will make only commitments to purchase such securities with the intention of
actually acquiring the securities, but the Fund may sell these securities prior
to the settlement date if it is deemed advisable. Purchasing Municipal Bonds on
a when-issued basis involves the risk that the yields available in the market
when the delivery takes place may actually be higher than those obtained in the
transaction itself; if yields so increase, the value of the when-issued
obligations generally will decrease. The Fund will maintain a separate account
at its custodian bank consisting of cash, cash equivalents or high-grade,
liquid Municipal Bonds or Temporary Investments (valued on a daily basis) equal
at all times to the amount of the when-issued commitment.
 
  The Fund may invest in Municipal Bonds (and Non-Municipal Tax-Exempt
Securities) the return on which is 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 or based on the
value of gold or some other commodity. The principal amount payable upon
maturity of certain Municipal Bonds also may be based on the value of an index.
Also, the Fund may invest in so-called "inverse floating obligations" or
"residual interest bonds" on which the interest rates typically decline as
market rates increase and increase as market rates decline. For example, 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, which may include reduced or eliminated interest payments and
losses of invested principal. Such securities have the effect of providing a
degree of investment leverage, since they may increase or decrease in value in
response to changes, as an illustration, in market interest rates at a rate
which is a multiple (typically two) of the rate at which fixed-rate long-term
tax exempt securities increase or decrease in response to such changes. As a
result, the market values of such securities will generally be more volatile
than the market values of fixed-rate tax exempt securities. To seek to limit
the volatility of these securities, the Fund may purchase inverse floating
obligations with shorter term maturities or which contain limitations on the
extent to which the interest rate may vary. Certain investments in such
obligations may be illiquid. The Fund may not invest in such illiquid
obligations if such investments, together with other illiquid investments,
would exceed 15% of the Fund's total assets. The Manager believes, however,
that indexed and inverse floating obligations represent flexible portfolio
management instruments for the Fund which allow the Fund to seek
 
                                       3
<PAGE>
 
potential investment rewards, hedge other portfolio positions or vary the
degree of investment leverage relatively efficiently under different market
conditions.
 
  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. Certain investments in
such obligations may be illiquid. The Fund may not invest in such illiquid
obligations if such investments, together with other illiquid investments,
would exceed 15% of the Fund's total assets.
 
  The Fund may invest up to 20% of its total assets in Municipal Bonds which
are rated below Baa by Moody's or below BBB by Standard & Poor's or Fitch or
which, in the Manager's judgment, possess similar credit characteristics ("high
yield securities"). See Appendix II--"Ratings of Municipal Bonds" for
additional information regarding ratings of debt securities. The Manager
considers the ratings assigned by Standard & Poor's, Moody's or Fitch as one of
several factors in its independent credit analysis of issuers.
 
  High yield securities are considered by Standard & Poor's, Moody's and Fitch
to have varying degrees of speculative characteristics. Consequently, although
high yield securities can be expected to provide higher yields, such securities
may be subject to greater market price fluctuations and risk of loss of
principal than lower yielding, higher rated debt securities. Investments in
high yield securities will be made only when, in the judgment of the Manager,
such securities provide attractive total return potential relative to the risk
of such securities, as compared to higher quality debt securities. The Fund
generally will not invest in debt securities in the lowest rating categories
(those rated CC or lower by Standard & Poor's or Fitch or Ca or lower by
Moody's) unless the Manager believes that the financial condition of the issuer
or the protection afforded the particular securities is stronger than would
otherwise be indicated by such low ratings.
 
  Issuers or obligors of high yield securities may be highly leveraged and may
not have available to them more traditional methods of financing. Therefore,
the risks associated with acquiring the securities of such issuers or obligors
generally are greater than is the case with higher rated securities. For
example, during an economic downturn or a sustained period of rising interest
rates, issuers or obligors of high yield securities may be more likely to
experience financial stress, especially if such issuers or obligors are highly
leveraged. In addition, the market for high yield municipal securities is
relatively new and has not weathered a major economic recession, and it is
unknown what effects such a recession might have on such securities. During
such periods, such issuers may not have sufficient revenues to meet their
interest payment obligations. The issuer's ability to service its debt
obligations also may be adversely affected by specific issuer developments, or
the issuer's inability to meet specific projected business forecasts, or the
unavailability of additional financing. The risk of loss due to default by the
issuer is significantly greater for the holders of high yield securities
because such securities may be unsecured and may be subordinated to other
creditors of the issuer.
 
  High yield securities frequently have call or redemption features that would
permit an issuer to repurchase the security from the Fund. If a call were
exercised by the issuer during a period of declining interest rates, the Fund
likely would have to replace such called security with a lower yielding
security, thus decreasing the net investment income to the Fund and dividends
to shareholders.
 
                                       4
<PAGE>
 
  The Fund may have difficulty disposing of certain high yield securities
because there may be a thin trading market for such securities. Because not all
dealers maintain markets in all high yield securities, there is no established
secondary market for many of these securities, and the Fund anticipates that
such securities could be sold only to a limited number of dealers or
institutional investors. To the extent that a secondary trading market for high
yield securities does exist, it generally is not as liquid as the secondary
market for higher rated 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. Reduced secondary market liquidity for certain
securities also may make it more difficult for the Fund to obtain accurate
market quotations for purposes of valuing the Fund's portfolio. Market
quotations generally are available on many high yield securities only from a
limited number of dealers and may not necessarily represent firm bids of such
dealers or prices for actual sales.
 
  It is expected that a significant portion of the high yield securities
acquired by the Fund will be purchased upon issuance, which may involve special
risks because the securities so acquired are new issues. In such instances the
Fund may be a substantial purchaser of the issue and therefore have the
opportunity to participate in structuring the terms of the offering. Although
this may enable the Fund to seek to protect itself against certain of such
risks, the considerations discussed herein would nevertheless remain
applicable.
 
  Adverse publicity and investor perceptions, which may not be based on
fundamental analysis, also may decrease the value and liquidity of high yield
securities, particularly in a thinly traded market. Factors adversely affecting
the market value of high yield securities are likely to adversely affect the
Fund's net asset value. In addition, the Fund may incur additional expenses to
the extent that it is required to seek recovery upon a default on a portfolio
holding or participate in the restructuring of the obligation.
 
                                 DESCRIPTION OF
                   MUNICIPAL BONDS AND TEMPORARY INVESTMENTS
 
  Set forth below is a description of the Municipal Bonds and Temporary
Investments in which the Fund may invest. A more complete discussion concerning
futures and options transactions is set forth under "Investment Objective and
Policies" in the Prospectus. Information with respect to ratings assigned to
tax-exempt obligations which the Fund may purchase is set forth in Appendix II
to this Statement of Additional Information.
 
DESCRIPTION OF MUNICIPAL BONDS
   
  Municipal Bonds include debt obligations issued to obtain funds for various
public purposes, including construction 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 or private activity bonds are
issued by or on behalf of public authorities to finance various privately owned
or operated facilities. Such obligations are included within the term Municipal
Bonds if the interest paid thereon is excluded from gross income for Federal
income tax purposes and, in the case of Massachusetts Municipal Bonds, exempt
from Massachusetts personal income taxes. Other types of industrial development
bonds or private activity bonds, the proceeds of which are used for the     
 
                                       5
<PAGE>
 
construction, equipment or improvement of privately operated industrial or
commercial facilities, may constitute Municipal Bonds, although the current
Federal tax laws place substantial limitations on the size of such issues.
 
  The two principal classifications of Municipal Bonds are "general obligation"
bonds and "revenue" bonds which latter category includes industrial development
bonds ("IDBs") and, for bonds issued after August 15, 1986, private activity
bonds. General obligation bonds are secured by the issuer's pledge of faith,
credit and taxing power for the payment of principal and interest. Revenue
bonds are payable only from the revenues derived from a particular facility or
class of facilities or, in some cases, from the proceeds of a special or
limited tax or other specific revenue source such as payments from the user of
the facility being financed. IDBs and, in the case of bonds issued after August
15, 1986, private activity bonds are in most cases revenue bonds and generally
do not constitute the pledge of the credit or taxing power of the issuer of
such bonds. Generally, the payment of the principal of and interest on such
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, unless a line of
credit, bond insurance or other security is furnished. The Fund may invest in
Municipal Bonds that are so-called "moral obligation" bonds, which are normally
issued by special purpose public authorities. If an issuer of moral obligation
bonds is unable to meet its obligations, repayment of such bonds becomes a
moral commitment, but not a legal obligation, of the state or municipality in
question.
   
  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 called
"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 is
frequently backed by the issuer's covenant to budget for, appropriate and make
the payments due under the lease obligation. Certain investments in lease
obligations may be illiquid. The Fund may not invest in illiquid lease
obligations if such investments, together with all other illiquid investments,
would exceed 15% of the Fund's total assets. The Fund may, however, invest
without regard to such limitation in lease obligations which the Manager,
pursuant to the guidelines which have been adopted by the Board of Trustees and
subject to the supervision of the Board of Trustees, determines to be liquid.
The Manager will deem lease obligations liquid if they are publicly offered and
have received an investment grade rating of Baa or better by Moody's, or BBB or
better by Standard & Poor's or Fitch. Unrated lease obligations, or those rated
below investment grade, will be considered liquid if the obligations come to
the market through an underwritten public offering and at least two dealers are
willing to give competitive bids. In reference to the latter, the Manager must,
among other things, also review the creditworthiness of the entity obligated to
make payment under the lease obligation and make certain specified
determinations based on such factors as the existence of a rating or credit
enhancement such as insurance, the frequency of trades or quotes for the
obligation and the willingness of dealers to make a market in the obligation.
    
  Yields on Municipal Bonds are dependent on a variety of factors, including
the general condition of the money market and of the municipal bond market, the
size of a particular offering, the financial condition of the issuer, the
general conditions of the Municipal Bond market, the maturity of the
obligation, and the rating
 
                                       6
<PAGE>
 
of the issue. The ability of the Fund to achieve its investment objective is
also dependent on the continuing ability of the issuers of the bonds in which
the Fund invests to meet their obligations for the payment of interest and
principal when due. There are variations in the risks involved in holding
Municipal Bonds, both within a particular classification and between
classifications, depending on numerous factors. Furthermore, the rights of
owners of Municipal Bonds and the obligations of the issuer of such Municipal
Bonds may be subject to applicable bankruptcy, insolvency and similar laws and
court decisions affecting the rights of creditors generally and to general
equitable principles, which may limit the enforcement of certain remedies.
 
DESCRIPTION OF TEMPORARY INVESTMENTS
   
  The Fund may invest in short-term tax-free and taxable securities subject to
the limitations set forth under "Investment Objective and Policies." The tax-
exempt money market securities may include municipal notes, municipal
commercial paper, municipal bonds with remaining maturity of less than one
year, variable rate demand notes and participations therein. Municipal notes
include tax anticipation notes, bond anticipation notes and grant anticipation
notes. Anticipation notes are sold as interim financing in anticipation of tax
collection, bond sales, government grants or revenue receipts. Municipal
commercial paper refers to short-term unsecured promissory notes generally
issued to finance short-term credit needs. The taxable money market securities
in which the Fund may invest as Temporary Investments consist of U.S.
Government securities, U.S. Government agency securities, domestic bank or
savings institution certificates of deposit and bankers' acceptances, short-
term corporate debt securities such as commercial paper, and repurchase
agreements. These Temporary Investments must have a stated maturity not in
excess of one year from the date of purchase.     
   
  Variable rate demand obligations ("VRDOs") are tax-exempt obligations which
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 upon a short
notice period not to exceed seven days. There is, however, the possibility that
because of default or insolvency the demand feature of VRDOs and Participating
VRDOs, described below, may not be honored. The interest rates are adjustable
at intervals (ranging from daily to up to one year) to some prevailing market
rate for similar investments, such adjustment formula being calculated to
maintain the market value of the VRDOs at approximately the par value of the
VRDOs on the adjustment date. The adjustments typically are set at a rate
determined by the remarketing agent or based upon the Public Securities
Association Index or some other appropriate interest rate adjustment index. The
Fund may invest in all types of tax-exempt instruments currently outstanding or
to be issued in the future which satisfy the short-term maturity and quality
standards of the Fund.     
 
  The Fund also may invest in VRDOs in the form of participation interests
("Participating VRDOs") in variable rate tax-exempt obligations held by a
financial institution, typically a commercial bank. Participating VRDOs provide
the Fund with a specified undivided interest (up to 100%) of the underlying
obligation and the right to demand payment of the unpaid principal balance plus
accrued interest on the Participating VRDOs from the financial institution upon
a specified number of days' notice, not to exceed seven days. In addition, a
Participating VRDO is backed by an irrevocable letter of credit or guaranty of
the financial institution. The Fund would have an undivided interest in the
underlying obligation and thus participate on the same basis as the financial
institution in such obligation except that the financial institution typically
retains fees out of the interest paid on the obligation for servicing the
obligation, providing the letter of credit
 
                                       7
<PAGE>
 
and issuing the repurchase commitment. The Fund has been advised by its counsel
that the Fund should be entitled to treat the income received on Participating
VRDOs as interest from tax-exempt obligations.
 
  VRDOs that contain an unconditional right of demand to receive payment of the
unpaid principal balance plus accrued interest on a notice period exceeding
seven days may be deemed to be illiquid securities. A VRDO with a demand notice
period exceeding seven days will therefore be subject to the Fund's restriction
on illiquid investments unless, in the judgment of the Trustees, such VRDO is
liquid. The Trustees may adopt guidelines and delegate to the Manager the daily
function of determining and monitoring liquidity of such VRDOs. The Trustees,
however, will retain sufficient oversight and will be ultimately responsible
for such determination.
   
  The Trust has established the following standards with respect to money
market securities and VRDOs in which the Fund invests. Commercial paper
investments at the time of purchase must be rated A-1 through A-3 by Standard &
Poor's, Prime-1 through Prime-3 by Moody's or F-1 through F-3 by Fitch or, if
not rated, issued by companies having an outstanding debt issue rated at least
A by Standard & Poor's, Fitch or Moody's. Investments in corporate bonds and
debentures (which must have maturities at the date of purchase of one year or
less) must be rated at the time of purchase at least A by Standard & Poor's,
Moody's or Fitch. Notes and VRDOs at the time of purchase must be rated SP-1/A-
1 through SP-2/A-3 by Standard & Poor's, MIG-l/VMIG-1 through MIG-4/VMIG-4 by
Moody's or F-1 through F-3 by Fitch. Temporary Investments, if not rated, must
be of comparable quality to securities rated in the above rating categories in
the opinion of the Manager. The Fund may not invest in any security issued by a
commercial bank or a savings institution unless the bank or institution is
organized and operating in the United States, has total assets of at least one
billion dollars and is a member of the Federal Deposit Insurance Corporation
("FDIC"), except that up to 10% of total assets may be invested in certificates
of deposit of small institutions if such certificates are fully insured by the
FDIC.     
 
REPURCHASE AGREEMENTS
 
  The Fund may invest in securities pursuant to repurchase agreements.
Repurchase agreements may be entered into only with a member bank of the
Federal Reserve System or a primary dealer in U.S. Government securities or an
affiliate thereof. Under such agreements, the seller agrees, upon entering into
the contract, to repurchase the security at a mutually agreed upon time and
price, thereby determining the yield during the term of the agreement. This
results in a fixed rate of return insulated from market fluctuations during
such period. In repurchase agreements, the prices at which the trades are
conducted do not reflect accrued interest on the underlying obligations. Such
agreements usually cover short periods, such as under one week. Repurchase
agreements may be construed to be collateralized loans by the purchaser to the
seller secured by the securities transferred to the purchaser. In the case of a
repurchase agreement, the Fund will require the seller to provide additional
collateral if the market value of the securities falls below the repurchase
price at any time during the term of the repurchase agreement. In the event of
default by the seller under a repurchase agreement construed to be a
collateralized loan, the underlying securities are not owned by the Fund but
only constitute collateral for the seller's obligation to pay the repurchase
price. Therefore, the Fund may suffer time delays and incur costs or possible
losses in connection with the disposition of the collateral. In the event of a
default under such a repurchase agreement, instead of the contractual fixed
rate of return, the rate of return to the Fund will depend on intervening
fluctuations of the market value of such security and the
 
                                       8
<PAGE>
 
accrued interest on the security. In such event, the Fund would have rights
against the seller for breach of contract with respect to any losses arising
from market fluctuations following the failure of the seller to perform. The
Fund may not invest in repurchase agreements maturing in more than seven days
if such investments, together with all other illiquid investments, would exceed
15% of the Fund's total assets.
   
  In general, for Federal income tax purposes, repurchase agreements are
treated as collateralized loans secured by the securities "sold." Therefore,
amounts earned under such agreements will not be considered tax-exempt
interest.     
 
FINANCIAL FUTURES TRANSACTIONS AND OPTIONS
 
  Reference is made to the discussion concerning futures transactions under
"Investment Objective and Policies" in the Prospectus. Set forth below is
additional information concerning these transactions.
 
  As described in the Prospectus, the Fund may purchase and sell exchange
traded financial futures contracts ("financial futures contracts") to hedge its
portfolio of Municipal Bonds against declines in the value of such securities
and to hedge against increases in the cost of securities the Fund intends to
purchase. However, any transactions involving financial futures or options will
be in accordance with the Fund's investment policies and limitations. To hedge
its portfolio, the Fund may take an investment position in a futures contract
which will move in the opposite direction from the portfolio position being
hedged. While the Fund's use of hedging strategies is intended to moderate
capital changes in portfolio holdings and thereby reduce the volatility of the
net asset value of Fund shares, the Fund anticipates that its net asset value
will fluctuate. Set forth below is information concerning futures transactions.
 
  Description of Futures Contracts. A futures contract is an agreement between
two parties to buy and sell a security, or in the case of an index-based
futures contract, to make and accept a cash settlement for a set price on a
future date. A majority of transactions in futures contracts, however, do not
result in the actual delivery of the underlying instrument or cash settlement,
but are settled through liquidation, i.e., by entering into an offsetting
transaction. Futures contracts have been designed by boards of trade which have
been designated "contracts markets" by the Commodity Futures Trading Commission
("CFTC").
   
  The purchase or sale of a futures contract differs from the purchase or sale
of a security in that no price or premium is paid or received. Instead, an
amount of cash or securities acceptable to the broker and the relevant contract
market, which varies, but is generally about 5% of the contract amount, must be
deposited with the broker. This amount is known as "initial margin" and
represents a "good faith" deposit assuring the performance of both the
purchaser and seller under the futures contract. Subsequent payments to and
from the broker, called "variation margin," are required to be made on a daily
basis as the price of the futures contract fluctuates making the long and short
positions in the futures contract more or less valuable, a process known as
"marking to the market." At any time prior to the settlement date of the
futures contract, the position may be closed out by taking an opposite position
which will operate to terminate the position in the futures contract. A final
determination of variation margin is then made, additional cash is required to
be paid to or released by the broker, and the purchaser realizes a loss or
gain. In addition, a nominal commission is paid on each completed sale
transaction.     
 
 
                                       9
<PAGE>
 
  The Fund may deal in financial futures contracts based on a long-term
municipal bond index developed by the Chicago Board of Trade ("CBT") and The
Bond Buyer (the "Municipal Bond Index"). The Municipal Bond Index is comprised
of 40 tax-exempt municipal revenue and general obligations bonds. Each bond
included in the Municipal Bond Index must be rated A or higher by Moody's or
Standard & Poor's and must have a remaining maturity of 19 years or more. Twice
a month new issues satisfying the eligibility requirements are added to, and an
equal number of old issues are deleted from, the Municipal Bond Index. The
value of the Municipal Bond Index is computed daily according to a formula
based on the price of each bond in the Municipal Bond Index, as evaluated by
six dealer-to-dealer brokers.
 
  The Municipal Bond Index futures contract is traded only on the CBT. Like
other contract markets, the CBT assures performance under futures contracts
through a clearing corporation, a nonprofit organization managed by the
exchange membership which also is responsible for handling daily accounting of
deposits or withdrawals of margin.
 
  As described in the Prospectus, the Fund may purchase and sell financial
futures contracts on U.S. Government securities as a hedge against adverse
changes in interest rates as described below. With respect to U.S. Government
securities, currently there are financial futures contracts based on long-term
U.S. Treasury bonds, Treasury notes, Government National Mortgage Association
("GNMA") Certificates and three-month U.S. Treasury bills. The Fund may
purchase and write call and put options on futures contracts on U.S. Government
securities in connection with its hedging strategies.
   
  Subject to policies adopted by the Trustees, the Fund also may engage in
other futures contracts transactions such as futures contracts on other
municipal bond indices that may become available if the Manager and the
Trustees should determine that there is normally a sufficient correlation
between the prices of such futures contracts and the Municipal Bonds in which
the Fund invests to make such hedging appropriate.     
 
  Futures Strategies. The Fund may sell a financial futures contract (i.e.,
assume a short position) in anticipation of a decline in the value of its
investments in Municipal Bonds resulting from an increase in interest rates or
otherwise. The risk of decline could be reduced without employing futures as a
hedge by selling such Municipal Bonds and either reinvesting the proceeds in
securities with shorter maturities or by holding assets in cash. This strategy,
however, entails increased transaction costs in the form of dealer spreads and
typically would reduce the average yield of the Fund's portfolio securities as
a result of the shortening of maturities. The sale of futures contracts
provides an alternative means of hedging against declines in the value of its
investments in Municipal Bonds. As such values decline, the value of the Fund's
positions in the futures contracts will tend to increase, thus offsetting all
or a portion of the depreciation in the market value of the Fund's Municipal
Bond investments which are being hedged. While the Fund will incur commission
expenses in selling and closing out futures positions, commissions on futures
transactions are lower than transaction costs incurred in the purchase and sale
of Municipal Bonds. In addition, the ability of the Fund to trade in the
standardized contracts available in the futures markets may offer a more
effective defensive position than a program to reduce the average maturity of
the portfolio securities due to the unique and varied credit and technical
characteristics of the municipal debt instruments available to the Fund.
Employing futures as a hedge also may permit the Fund to assume a defensive
posture without reducing the yield on its investments beyond any amounts
required to engage in futures trading.
 
 
                                       10
<PAGE>
 
  When the Fund intends to purchase Municipal Bonds, the Fund may purchase
futures contracts as a hedge against any increase in the cost of such Municipal
Bonds, resulting from an increase in interest rates or otherwise, that may
occur before such purchases can be effected. Subject to the degree of
correlation between the Municipal Bonds and the futures contracts, subsequent
increases in the cost of Municipal Bonds should be reflected in the value of
the futures held by the Fund. As such purchases are made, an equivalent amount
of futures contracts will be closed out. Due to changing market conditions and
interest rate forecasts, however, a futures position may be terminated without
a corresponding purchase of portfolio securities.
 
  Call Options on Futures Contracts. The Fund also may purchase and sell
exchange traded call and put options on financial futures contracts on U.S.
Government securities. The purchase of a call option on a futures contract is
analogous to the purchase of a call option on an individual security. Depending
on the pricing of the option compared to either the futures contract on which
it is based, or on the price of the underlying debt securities, it may or may
not be less risky than ownership of the futures contract or underlying debt
securities. Like the purchase of a futures contract, the Fund will purchase a
call option on a futures contract to hedge against a market advance when the
Fund is not fully invested.
 
  The writing of a call option on a futures contract constitutes a partial
hedge against declining prices of the securities which are deliverable upon
exercise of the futures contract. If the futures price at expiration is below
the exercise price, the Fund will retain the full amount of the option premium
which provides a partial hedge against any decline that may have occurred in
the Fund's portfolio holdings.
 
  Put Options on Futures Contracts. The purchase of options on a futures
contract is analogous to the purchase of protective put options on portfolio
securities. The Fund will purchase put options on futures contracts to hedge
the Fund's portfolio against the risk of rising interest rates.
 
  The writing of a put option on a futures contract constitutes a partial hedge
against increasing prices of the securities which are deliverable upon exercise
of the futures contract. If the futures price at expiration is higher than the
exercise price, the Fund will retain the full amount of the option premium
which provides a partial hedge against any increase in the price of Municipal
Bonds which the Fund intends to purchase.
 
  The writer of an option on a futures contract is required to deposit initial
and variation margin pursuant to requirements similar to those applicable to
futures contracts. Premiums received from the writing of an option will be
included in initial margin. The writing of an option on a futures contract
involves risks similar to those relating to futures contracts.
 
  The Trust has received an order from the Commission exempting it from the
provisions of Section 17(f) and Section 18(f) of the Investment Company Act of
1940, as amended (the "1940 Act"), in connection with its strategy of investing
in futures contracts. Section 17(f) relates to the custody of securities and
other assets of an investment company and may be deemed to prohibit certain
arrangements between the Trust and commodities brokers with respect to initial
and variation margin. Section 18(f) of the 1940 Act prohibits an open-end
investment company such as the Trust from issuing a "senior security" other
than a borrowing from a bank. The staff of the Commission has in the past
indicated that a futures contract may be a "senior security" under the 1940
Act.
 
 
                                       11
<PAGE>
 
  Restrictions on Use of Futures Transactions. Regulations of the CFTC
applicable to the Fund require that all of the Fund's futures transactions
constitute bona fide hedging transactions and that the Fund purchase and sell
futures contracts and options thereon (i) for bona fide hedging purposes, and
(ii) for non-hedging purposes, if the aggregate initial margin and premiums
required to establish positions in such contracts and options does not exceed
5% of the liquidation value of the Fund's portfolio assets after taking into
account unrealized profits and unrealized losses on any such contracts and
options. (However, the Fund intends to engage in options and futures
transactions only for hedging purposes.) Margin deposits may consist of cash or
securities acceptable to the broker and the relevant contract market.
 
  When the Fund purchases futures contracts or a call option with respect
thereto or writes a put option on a futures contract, an amount of cash, cash
equivalents or liquid securities will be deposited in a segregated account with
the Fund's custodian so that the amount so segregated, plus the amount of
initial and variation margin held in the account of its broker, equals the
market value of the futures contract, thereby ensuring that the use of such
futures is unleveraged.
 
  Risk Factors in Futures Transactions and Options. Investment in futures
contracts involves the risk of imperfect correlation between movements in the
price of the futures contract and the price of the security being hedged. The
hedge will not be fully effective when there is imperfect correlation between
the movements in the prices of two financial instruments. For example, if the
price of the futures contract moves more than the price of the hedged security,
the Fund will experience either a loss or gain on the futures contract which is
not completely offset by movements in the price of the hedged securities. To
compensate for imperfect correlations, the Fund may purchase or sell futures
contracts in a greater dollar amount than the hedged securities if the
volatility of the hedged securities is historically greater than the volatility
of the futures contracts. Conversely, the Fund may purchase or sell fewer
futures contracts if the volatility of the price of the hedged securities is
historically less than that of the futures contracts.
 
  The particular municipal bonds comprising the index underlying the Municipal
Bond Index financial futures contract may vary from the Municipal Bonds held by
the Fund. As a result, the Fund's ability to hedge effectively all or a portion
of the value of its Municipal Bonds through the use of such financial futures
contracts will depend in part on the degree to which price movements in the
index underlying the financial futures contract correlate with the price
movements of the Municipal Bonds held by the Fund. The correlation may be
affected by disparities in the average maturity, ratings, geographical mix or
structure of the Fund's investments as compared to those comprising the
Municipal Bond Index, and general economic or political factors. In addition,
the correlation between movements in the value of the Municipal Bond Index may
be subject to change over time as additions to and deletions from the Municipal
Bond Index alter its structure. The correlation between futures contracts on
U.S. Government securities and the Municipal Bonds held by the Fund may be
adversely affected by similar factors and the risk of imperfect correlation
between movements in the prices of such futures contracts and the prices of the
Municipal Bonds held by the Fund may be greater.
 
  The Fund expects to liquidate a majority of the futures contracts it enters
into through offsetting transactions on the applicable contract market. There
can be no assurance, however, that a liquid secondary market will exist for any
particular futures contract at any specific time. Thus, it may not be possible
to close out a futures position. In the event of adverse price movements, the
Fund would continue to be required to
 
                                       12
<PAGE>
 
make daily cash payments of variation margin. In such situations, if the Fund
has insufficient cash, it may be required to sell portfolio securities to meet
daily variation margin requirements at a time when it may be disadvantageous to
do so. The inability to close out futures positions also could have an adverse
impact on the Fund's ability to hedge effectively its investments in Municipal
Bonds. The Fund will enter into a futures position only if, in the judgment of
the Manager, there appears to be an actively traded secondary market for such
futures contracts.
 
  The successful use of transactions in futures and related options also
depends on the ability of the Manager to forecast correctly the direction and
extent of interest rate movements within a given time frame. To the extent
interest rates remain stable during the period in which a futures contract or
option is held by the Fund or such rates move in a direction opposite to that
anticipated, the Fund may realize a loss on the hedging transaction which is
not fully or partially offset by an increase in the value of portfolio
securities. As a result, the Fund's total return for such period may be less
than if it had not engaged in the hedging transaction.
 
  Because of low initial margin deposits made on the opening of a futures
position, futures transactions involve substantial leverage. As a result,
relatively small movements in the price of the futures contracts can result in
substantial unrealized gains or losses. Because the Fund will engage in the
purchase and sale of futures contracts solely for hedging purposes, however,
any losses incurred in connection therewith should, if the hedging strategy is
successful, be offset in whole or in part by increases in the value of
securities held by the Fund or decreases in the price of securities the Fund
intends to acquire.
 
  The amount of risk the Fund assumes when it purchases an option on a futures
contract is the premium paid for the option plus related transaction costs. In
addition to the correlation risks discussed above, the purchase of an option on
a futures contract also entails the risk that changes in the value of the
underlying futures contract will not be reflected fully in the value of the
option purchased.
 
  Municipal Bond Index futures contracts were approved for trading in 1986.
Trading in such futures contracts may tend to be less liquid than that in other
futures contracts. The trading of futures contracts also is subject to certain
market risks, such as inadequate trading activity, which could at times make it
difficult or impossible to liquidate existing positions.
 
                            INVESTMENT RESTRICTIONS
 
  The Fund has adopted a number of fundamental and non-fundamental restrictions
and policies relating to the investment of its assets and its activities. The
fundamental policies set forth below may not be changed without the approval of
the holders of a majority of the Fund's outstanding voting securities (which
for this purpose and under the 1940 Act means the lesser of (i) 67% of the
Fund's shares present at a meeting at which more than 50% of the outstanding
shares of the Fund are represented or (ii) more than 50% of the Fund's
outstanding shares). The Fund may not:
 
    1. Invest more than 25% of its assets, taken at market value at the time
  of each investment, in the securities of issuers in any particular industry
  (excluding the U.S. Government and its agencies and instrumentalities). For
  purposes of this restriction, states, municipalities and their political
  subdivisions are not considered part of any industry.
 
 
                                       13
<PAGE>
 
    2. Make investments for the purpose of exercising control or management.
 
    3. Purchase or sell real estate, except that, to the extent permitted by
  applicable law, the Fund may invest in securities directly or indirectly
  secured by real estate or interests therein or issued by companies which
  invest in real estate or interests therein.
 
    4. Make loans to other persons, except that the acquisition of bonds,
  debentures or other corporate debt securities and investment in government
  obligations, commercial paper, pass-through instruments, certificates of
  deposit, bankers' acceptances, repurchase agreements or any similar
  instruments shall not be deemed to be the making of a loan, and except
  further that the Fund may lend its portfolio securities, provided that the
  lending of portfolio securities may be made only in accordance with
  applicable law and the guidelines set forth in the Fund's Prospectus and
  Statement of Additional Information, as they may be amended from time to
  time.
 
    5. Issue senior securities to the extent such issuance would violate
  applicable law.
 
    6. Borrow money, except that (i) the Fund may borrow from banks (as
  defined in the 1940 Act) in amounts up to 33 1/3% of its total assets
  (including the amount borrowed), (ii) the Fund may to the extent permitted
  by applicable law, borrow up to an additional 5% of its total assets for
  temporary purposes, (iii) the Fund may obtain such short-term credit as may
  be necessary for the clearance of purchases and sales of portfolio
  securities and (iv) the Fund may purchase securities on margin to the
  extent permitted by applicable law. The Fund may not pledge its assets
  other than to secure such borrowings or, to the extent permitted by the
  Fund's investment policies as set forth in its Prospectus and Statement of
  Additional Information, as they may be amended from time to time, in
  connection with hedging transactions, short sales, when-issued and forward
  commitment transactions and similar investment strategies.
 
    7. Underwrite securities of other issuers, except insofar as the Fund
  technically may be deemed an underwriter under the Securities Act of 1933,
  as amended (the "Securities Act"), in selling portfolio securities.
 
    8. Purchase or sell commodities or contracts on commodities, except to
  the extent that the Fund may do so in accordance with applicable law and
  the Fund's Prospectus and Statement of Additional Information, as they may
  be amended from time to time, and without registering as a commodity pool
  operator under the Commodity Exchange Act.
 
  Under the non-fundamental investment restrictions, the Fund may not:
     
    a. Purchase securities of other investment companies, except to the
  extent such purchases are permitted by applicable law. As a matter of
  policy, however, the Fund will not purchase shares of any registered open-
  end investment company or registered unit investment trust, in reliance on
  Section 12(d)(1)(F) or (G) (the "fund of funds" provisions) of the 1940 Act
  at any time the Fund's shares are owned by another investment company that
  is part of the same group of investment companies as the Fund.     
     
    b. Make short sales of securities or maintain a short position, except to
  the extent permitted by applicable law. The Fund currently does not intend
  to engage in short sales, except short sales "against the box."     
 
 
                                       14
<PAGE>
 
    c. Invest in securities which cannot be readily resold because of legal
  or contractual restrictions or which cannot otherwise be marketed, redeemed
  or put to the issuer or a third party, if at the time of acquisition more
  than 15% of its total assets would be invested in such securities. This
  restriction shall not apply to securities which mature within seven days or
  securities which the Board of Trustees of the Trust has otherwise
  determined to be liquid pursuant to applicable law.
          
    d. Notwithstanding fundamental investment restriction (6) above, borrow
  amounts in excess of 20% of its total assets, taken at market value
  (including the amount borrowed), and then only from banks as a temporary
  measure for extraordinary or emergency purposes. In addition, the Fund will
  not purchase securities while borrowings are outstanding.     
   
  In addition, to comply with Federal income tax requirements for qualification
as a "regulated investment company," the Fund's investments will be limited in
a manner such that, at the close of each quarter of each fiscal year, (a) no
more than 25% of the Fund's total assets are invested in the securities of a
single issuer, and (b) with regard to at least 50% of the Fund's total assets,
no more than 5% of its total assets are invested in the securities of a single
issuer. For purposes of this restriction, the Fund will regard each state and
each political subdivision, agency or instrumentality of such state and each
multi-state agency of which such state is a member and each public authority
which issues securities on behalf of a private entity as a separate issuer,
except that if the security is backed only by the assets and revenues of a non-
governmental entity then the entity with the ultimate responsibility for the
payment of interest and principal may be regarded as the sole issuer. These
tax-related limitations may be changed by the Trustees of the Trust to the
extent necessary to comply with changes to the Federal income tax requirements.
       
  Because of the affiliation of Merrill Lynch, Pierce, Fenner & Smith
Incorporated ("Merrill Lynch") with the Trust, the Fund is prohibited from
engaging in certain transactions involving such firm or its affiliates except
for brokerage transactions permitted under the 1940 Act involving only usual
and customary commissions or transactions pursuant to an exemptive order under
the 1940 Act. Included among such restricted transactions will be purchases
from or sales to Merrill Lynch of securities in transactions in which it acts
as principal. See "Portfolio Transactions." An exemptive order has been
obtained which permits the Trust to effect principal transactions with Merrill
Lynch in high quality, short-term, tax-exempt securities subject to conditions
set forth in such order.     
 
                            MANAGEMENT OF THE TRUST
 
TRUSTEES AND OFFICERS
 
  Information about the Trustees, executive officers and the portfolio manager
of the Trust, including their ages and their principal occupations for at least
the last five years, is set forth below. Unless otherwise noted, the address of
each Trustee and executive officer is P.O. Box 9011, Princeton, New Jersey
08543-9011.
   
  Arthur Zeikel (65)--President and Trustee(1)(2)--President of the Manager
(which term as used herein includes its corporate predecessors) since 1977;
President of Merrill Lynch Asset Management, L.P. ("MLAM," which term as used
herein includes MLAM's corporate predecessors) since 1977; President and
Director of Princeton Services, Inc. ("Princeton Services") since 1993;
Executive Vice President of Merrill Lynch & Co., Inc. ("ML & Co.") since 1990.
    
                                       15
<PAGE>
 
   
  James H. Bodurtha (53)--Trustee(2)--36 Popponesset Road, Cotuit,
Massachusetts 02635. Director and Executive Vice President, The China Business
Group, Inc. since 1996; Chairman and Chief Executive Officer, China Enterprise
Management Corporation from 1993 to 1996; Chairman, Berkshire Corporation since
1980; Partner, Squire, Sanders & Dempsey from 1980 to 1993.     
   
  Herbert I. London (58)--Trustee(2)--113-115 University Place, New York, New
York 10003. John M. Olin Professor of Humanities, New York University since
1993 and Professor thereof since 1980; President, Hudson Institute since 1997
and Trustee since 1980; Dean, Gallatin Division of New York University from
1976 to 1993; Distinguished Fellow, Herman Kahn Chair, Hudson Institute from
1984 to 1985; Director, Damon Corporation from 1991 to 1995; Overseer, Center
for Naval Analyses from 1983 to 1993; Limited Partner, Hypertech LP since 1996.
       
  Robert R. Martin (70)--Trustee(2)--513 Grand Hill, St. Paul, Minnesota 55102.
Chairman and Chief Executive Officer, Kinnard Investments, Inc. from 1990 to
1993; Executive Vice President, Dain Bosworth from 1974 to 1989; Director,
Carnegie Capital Management from 1977 to 1985 and Chairman thereof in 1979;
Director, Securities Industry Association from 1981 to 1982 and Public
Securities Association from 1979 to 1980; Chairman of the Board, WTC
Industries, Inc. in 1994; Trustee, Northland College since 1992.     
   
  Joseph L. May (68)--Trustee(2)--424 Church Street, Suite 2000, Nashville,
Tennessee 37219. Attorney in private practice since 1984; President, May and
Athens Hosiery Mills Division, Wayne-Gossard Corporation from 1954 to 1983;
Vice President, Wayne-Gossard Corporation from 1972 to 1983; Chairman, The May
Corporation (personal holding company) from 1972 to 1983; Director, Signal
Apparel Co. from 1972 to 1989.     
   
  Andre F. Perold (45)--Trustee(2)--Morgan Hall, Soldiers Field, Boston,
Massachusetts 02163. Professor, Harvard Business School since 1989 and
Associate Professor from 1983 to 1989; Trustee, The Common Fund since 1989;
Director, Quantec Limited since 1991 and TIBCO from 1994 to 1996.     
   
  Terry K. Glenn (57)--Executive Vice President(1)(2)--Executive Vice President
of the Manager and MLAM since 1983; Executive Vice President and Director of
Princeton Services since 1993; President of Merrill Lynch Funds Distributors,
Inc. ("MLFD" or the "Distributor") since 1986 and Director thereof since 1991;
President of Princeton Administrators, L.P. since 1988.     
   
  Vincent R. Giordano (53)--Senior Vice President(1)(2)--Senior Vice President
of the Manager and MLAM since 1984; Vice President of MLAM from 1980 to 1984;
Senior Vice President of Princeton Services since 1993.     
   
  Kenneth A. Jacob (46)--Vice President(1)(2)--First Vice President of MLAM
since 1997; Vice President of MLAM from 1984 to 1997; Vice President of the
Manager since 1984.     
   
  Theodore R. Jaeckel, Jr. (38)--Vice President and Portfolio Manager of the
Fund(1)(2)--Director (Municipal Tax-Exempt Fund Management) of MLAM since 1997;
Vice President from 1991 to 1997.     
   
  Donald C. Burke (37)--Vice President(1)(2)--First Vice President of MLAM
since 1997; Vice President of MLAM from 1990 to 1997; Director of Taxation of
MLAM since 1990.     
 
 
                                       16
<PAGE>
 
   
  Gerald M. Richard (48)--Treasurer(1)(2)--Senior Vice President and Treasurer
of the Manager and MLAM since 1984; Senior Vice President and Treasurer of
Princeton Services since 1993; Treasurer of MLFD since 1984 and Vice President
thereof since 1981.     
          
  Robert E. Putney, III (37)--Secretary(1)(2)--Director (Legal Advisory) of
MLAM since 1997; Vice President of MLAM from 1994 to 1997; Attorney employed
by MLAM from 1991 to 1994; Attorney in private practice prior thereto.     
- --------
(1) Interested person, as defined in the 1940 Act, of the Trust.
   
(2) Such Trustee or officer is a director, trustee or officer of certain other
    investment companies for which the Manager or MLAM acts as investment
    adviser or manager.     
   
  At September 30, 1997, the Trustees and officers of the Trust as a group (13
persons) owned an aggregate of less than 1% of the outstanding shares of the
Fund. At such date, Mr. Zeikel a Trustee and officer of the Trust and the
other officers of the Trust owned an aggregate of less than 1% of the
outstanding shares of Common Stock of ML & Co.     
 
COMPENSATION OF TRUSTEES
   
  The Trust pays each Trustee not affiliated with the Manager (each a "non-
affiliated Trustee") a fee of $10,000 per year plus $1,000 per meeting
attended, together with such Trustee's actual out-of-pocket expenses relating
to attendance at meetings. The Trust also compensates members of its Audit and
Nominating Committee (the "Committee"), which consists of all the non-
affiliated Trustees, a fee of $2,000 per year plus $500 per meeting attended.
The Trust reimburses each non-affiliated Trustee for his out-of-pocket
expenses relating to attendance at Board and Committee meetings. The fees and
expenses of the Trustees are allocated to the respective series of the Trust
on the basis of asset size. For the fiscal year ended July 31, 1997, fees and
expenses paid to non-affiliated Trustees that were allocated to the Fund
aggregated $3,290.     
   
  The following table sets forth for the fiscal year ended July 31, 1997,
compensation paid by the Fund to the non-affiliated Trustees and for the
calendar year ended December 31, 1996, the aggregate compensation paid by all
registered investment companies (including the Trust) advised by the Manager
and its affiliate, MLAM ("FAM/MLAM Advised Funds") to the non-affiliated
Trustees:     
 
<TABLE>   
<CAPTION>
                                                                    AGGREGATE
                                                                   COMPENSATION
                                                    PENSION OR    FROM TRUST AND
                                                    RETIREMENT        OTHER
                                                     BENEFITS        FAM/MLAM
                                                    ACCRUED AS    ADVISED FUNDS
                                     COMPENSATION PART OF TRUST'S    PAID TO
NAME OF TRUSTEE                       FROM TRUST     EXPENSES       TRUSTEE(1)
- ---------------                      ------------ --------------- --------------
<S>                                  <C>          <C>             <C>
James H. Bodurtha...................     $676          None          $148,500
Herbert I. London...................     $676          None          $148,500
Robert R. Martin....................     $676          None          $148,500
Joseph L. May.......................     $676          None          $148,500
Andre F. Perold.....................     $676          None          $148,500
</TABLE>    
- --------
(1) The Trustees serve on the boards of FAM/MLAM Advised Funds as follows: Mr.
    Bodurtha (22 registered investment companies consisting of 46 portfolios);
    Mr. London (22 registered investment companies consisting of 46
    portfolios); Mr. Martin (22 registered investment companies consisting of
    46 portfolios); Mr. May (22 registered investment companies consisting of
    46 portfolios); and Mr. Perold (22 registered investment companies
    consisting of 46 portfolios).
 
                                      17
<PAGE>
 
MANAGEMENT AND ADVISORY ARRANGEMENTS
 
  Reference is made to "Management of the Trust--Management and Advisory
Arrangements" in the Prospectus for certain information concerning the
management and advisory arrangements of the Fund.
 
  Securities may be held by, or be appropriate investments for, the Fund as
well as other funds or investment advisory clients of the Manager or its
affiliates. Because of different objectives or other factors, a particular
security may be bought for one or more clients when one or more clients are
selling the same security. If the Manager or its affiliates purchase or sell
securities for the Fund or other funds for which they act as manager or for
their advisory clients and such sales or purchases 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. To the extent that transactions on behalf of more than one client of
the Manager or its affiliates during the same period may increase the demand
for securities being purchased or the supply of securities being sold, there
may be an adverse effect on price.
   
  Pursuant to a management agreement between the Trust on behalf of the Fund
and the Manager (the "Management Agreement"), the Manager receives for its
services to the Fund monthly compensation based upon the average daily net
assets of the Fund at the following annual rates: 0.55% of the average daily
net assets not exceeding $500 million; 0.525% of the average daily net assets
exceeding $500 million but not exceeding $1.0 billion; and 0.50% of the
average daily net assets exceeding $1.0 billion. For the fiscal years ended
July 31, 1995, 1996 and 1997, the total advisory fees payable by the Fund to
the Manager were $433,979, $406,646 and $355,290, respectively. During the
fiscal year ended July 31, 1995, the Manager voluntarily waived $22,680 of
such fees. No fees were waived during the fiscal years ended July 31, 1996 and
1997.     
   
  The Management Agreement obligates the Manager to provide investment
advisory services and to pay all compensation of and furnish office space for
officers and employees of the Trust connected with investment and economic
research, trading and investment management of the Trust, as well as the fees
of all Trustees of the Trust who are affiliated persons of ML & Co. or any of
its affiliates. The Fund pays all other expenses incurred in its operation and
a portion of the Trust's general administrative expenses allocated on the
basis of the asset size of the respective series of the Trust ("Series").
Expenses that will be borne directly by the Series include, among other
things, redemption expenses, expenses of portfolio transactions, expenses of
registering the shares under Federal and state securities laws, pricing costs
(including the daily calculation of net asset value), expenses of printing
shareholder reports, prospectuses and statements of additional information
(except to the extent paid by the Distributor as described below), fees for
legal and auditing services, Commission fees, interest, certain taxes, and
other expenses attributable to a particular Series. Expenses that will be
allocated on the basis of asset size of the respective Series include fees and
expenses of unaffiliated Trustees, state franchise taxes, costs of printing
proxies and other expenses related to shareholder meetings, and other expenses
properly payable by the Trust. The organizational expenses of the Trust were
paid by the Trust, and as additional Series are added to the Trust, the
organizational expenses are allocated among the Series (including the Fund) in
a manner deemed equitable by the Trustees. Depending upon the nature of a
lawsuit, litigation costs may be assessed to the specific Series to which the
lawsuit relates or allocated on the basis of the asset size of the respective
Series. The Trustees have determined that this is an appropriate method of
allocation of expenses. Accounting services are provided to the Fund by the
Manager and the Fund reimburses the Manager for its costs in connection with
such services. For the fiscal years ended July 31, 1995, 1996 and 1997, the
Fund reimbursed the Manager $49,939, $38,780 and $40,593, respectively, for
such     
 
                                      18
<PAGE>
 
   
services. As required by the Fund's distribution agreements, the Distributor
will pay the promotional expenses of the Fund incurred in connection with the
offering of shares of the Fund. Certain expenses in connection with the account
maintenance and the distribution of Class B and Class C shares will be financed
by the Fund pursuant to the Distribution Plans in compliance with Rule 12b-1
under the 1940 Act. See "Purchase of Shares--Distribution Plans."     
 
  The Manager is a limited partnership, the partners of which are ML & Co. and
Princeton Services. ML & Co. and Princeton Services are "controlling persons"
of the Manager as defined under the 1940 Act because of their ownership of its
voting securities or their power to exercise a controlling influence over its
management or policies.
 
  Duration and Termination. Unless earlier terminated as described herein, the
Management Agreement will remain in effect from year to year if approved
annually (a) by the Trustees of the Trust or by a majority of the outstanding
shares of the Fund and (b) by a majority of the Trustees who are not parties to
such contract or interested persons (as defined in the 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 vote of
the shareholders of the Fund.
 
                               PURCHASE OF SHARES
 
  Reference is made to "Purchase of Shares" in the Prospectus for certain
information as to the purchase of Fund shares.
   
  The Fund issues four classes of shares under the Merrill Lynch Select
Pricing SM System: shares of Class A and Class D are sold to investors choosing
the initial sales charge alternatives, and shares of Class B and Class C are
sold to investors choosing the deferred sales charge alternatives. Each Class
A, Class B, Class C and Class D share of the Fund represents identical
interests in the investment portfolio of the Fund and has the same rights,
except that Class B, Class C and Class D shares bear the expenses of the
ongoing account maintenance fees, and Class B and Class C shares bear the
expenses of the ongoing distribution fees and the additional incremental
transfer agency costs resulting from the deferred sales charge arrangements.
Class B, Class C and Class D shares each have exclusive voting rights with
respect to the Rule 12b-1 distribution plan adopted with respect to such class
pursuant to which account maintenance and/or distribution fees are paid (except
that Class B shareholders may vote upon any material changes to expenses
charged under the Class D Distribution Plan). Each class has different exchange
privileges. See "Shareholder Services--Exchange Privilege."     
   
  The Merrill Lynch Select Pricing SM System is used by more than 50 registered
investment companies advised by MLAM or its affiliate, the Manager. Funds
advised by MLAM or the Manager that utilize the Merrill Lynch Select PricingSM
System are referred to herein as "MLAM-advised mutual funds."     
 
  The Fund has entered into four separate distribution agreements with the
Distributor in connection with the continuous offering of each class of shares
of the Fund (the "Distribution Agreements"). The Distribution Agreements
obligate the Distributor to pay certain expenses in connection with the
offering of each class of
 
                                       19
<PAGE>
 
shares of the Fund. After the prospectuses, statements of additional
information and periodic reports have been prepared, set in type and mailed to
shareholders, the Distributor pays for the printing and distribution of copies
thereof used in connection with the offering to dealers and prospective
investors. The Distributor also pays for other supplementary sales literature
and advertising costs. The Distribution Agreements are subject to the same
renewal requirements and termination provisions as the Management Agreement
described above.
 
INITIAL SALES CHARGE ALTERNATIVES--CLASS A AND CLASS D SHARES
   
  The gross sales charges for the sale of Class A shares for the fiscal year
ended July 31, 1995 were $2,027, of which the Distributor received $189 and
Merrill Lynch received $1,838. The gross sales charges for the sale of Class A
shares for the fiscal year ended July 31, 1996 were $580, of which the
Distributor received $43 and Merrill Lynch received $537. The gross sales
charge for the sale of Class A shares for the fiscal year ended July 31, 1997
were $530 of which the Distributor received $40 and Merrill Lynch received
$490. For the fiscal years ended July 31, 1995, 1996 and 1997, the Distributor
received no contingent deferred sales charges ("CDSCs") with respect to
redemption within one year after purchase of Class A shares purchased subject
to a front-end sales charge waiver. The gross sales charges for the sale of
Class D shares for the period October 21, 1994 (commencement of operations) to
July 31, 1995 were $7,055, of which the Distributor received $621 and Merrill
Lynch received $6,434. The gross sales charges for the sale of Class D shares
for the fiscal year ended July 31, 1996 were $2,286, of which the Distributor
received $207 and Merrill Lynch received $2,079. The gross sales charge for
the sale of Class D shares for the fiscal year ended July 31, 1997 were $2,819
of which the Distributor received $314 and Merrill Lynch received $2,505. For
the period October 21, 1994 (commencement of operations) to July 31, 1995 and
for the fiscal years ended July 31, 1996, and 1997, the Distributor received
no CDSCs with respect to redemption within one year after purchase of Class D
shares purchased subject to a front-end sales charge waiver.     
   
  The term "purchase," as used in the Prospectus and this Statement of
Additional Information in connection with an investment in Class A and Class D
shares of the Fund, refers to a single purchase by an individual, or to
concurrent purchases, which in the aggregate are at least equal to the
prescribed amounts, by an individual, his spouse and their children under the
age of 21 years purchasing shares for his or their own account and to single
purchases by a trustee or other fiduciary purchasing shares for a single trust
estate or single fiduciary account although more than one beneficiary is
involved. The term "purchase" also includes purchases by any "company," as
that term is defined in the 1940 Act, but does not include purchases by any
such company that has not been in existence for at least six months or which
has no purpose other than the purchase of shares of the Fund or shares of
other registered investment companies at a discount; provided, however, that
it shall not include purchases by any group of individuals whose sole
organizational nexus is that the participants therein are credit cardholders
of a company, policyholders of an insurance company, customers of either a
bank or broker-dealer or clients of an investment adviser.     
   
  Closed-End Fund Investment Option. Class A shares of the Fund and certain
other MLAM-advised mutual funds ("Eligible Class A shares") are offered at net
asset value to shareholders of certain closed-end funds advised by the Manager
or MLAM who purchased such closed-end fund shares prior to October 21, 1994,
the date the Merrill Lynch Select Pricing SM System commenced operations, and
wish to reinvest the net proceeds from a sale of their closed-end fund shares
of common stock in Eligible Class A shares, if the conditions set forth below
are satisfied. Alternatively, closed-end fund shareholders who purchased such
    
                                      20
<PAGE>
 
shares on or after October 21, 1994 and wish to reinvest the net proceeds from
a sale of their closed-end fund shares are offered Class A shares (if eligible
to buy Class A shares) or Class D shares of the Fund and other MLAM-advised
mutual funds ("Eligible Class D shares"), if the following conditions are met.
First, the sale of closed-end fund shares must be made through Merrill Lynch,
and the net proceeds therefrom must be immediately reinvested in Eligible Class
A or Class D shares. Second, the closed-end fund shares must either have been
acquired in the initial public offering or be shares representing dividends
from shares of common stock acquired in such offering. Third, the closed-end
fund shares must have been continuously maintained in a Merrill Lynch
securities account. Fourth, there must be a minimum purchase of $250 to be
eligible for the investment option.
 
  Shareholders of certain MLAM-advised continuously offered closed-end funds
may reinvest at net asset value the net proceeds from a sale of certain shares
of common stock of such funds in shares of the Fund. Upon exercise of this
investment option, shareholders of Merrill Lynch Senior Floating Rate Fund,
Inc. will receive Class A shares of the Fund and shareholders of Merrill Lynch
Municipal Strategy Fund, Inc. and Merrill Lynch High Income Municipal Bond
Fund, Inc. will receive Class D shares of the Fund, except that shareholders
already owning Class A shares of the Fund will be eligible to purchase
additional Class A shares pursuant to this option, if such additional Class A
shares will be held in the same account as the existing Class A shares and the
other requirements pertaining to the reinvestment privilege are met. In order
to exercise this investment option, a shareholder of one of the above-
referenced continuously offered closed-end funds (an "eligible fund") must sell
his or her shares of common stock of the eligible fund (the "eligible shares")
back to the eligible fund in connection with a tender offer conducted by the
eligible fund and reinvest the proceeds immediately in the designated class of
shares of the Fund. This investment option is available only with respect to
eligible shares as to which no Early Withdrawal Charge or CDSC (each as defined
in the eligible fund's prospectus) is applicable. Purchase orders from eligible
fund shareholders wishing to exercise this investment option will be accepted
only on the day that the related tender offer terminates and will be effected
at the net asset value of the designated class of the Fund on such day.
 
REDUCED INITIAL SALES CHARGES
 
  Right of Accumulation. Reduced sales charges are applicable through a right
of accumulation under which eligible investors are permitted to purchase shares
of the Fund subject to an initial sales charge at the offering price applicable
to the total of (a) the public offering price of the shares then being
purchased plus (b) an amount equal to the then current net asset value or cost,
whichever is higher, of the purchaser's combined holdings of all classes of
shares of the Fund and of other MLAM-advised mutual funds. For any such right
of accumulation to be made available, the Distributor must be provided at the
time of purchase, by the purchaser or the purchaser's securities dealer, with
sufficient information to permit confirmation of qualification. Acceptance of
the purchase order is subject to such confirmation. The right of accumulation
may be amended or terminated at any time. Shares held in the name of a nominee
or custodian under pension, profit-sharing, or other employee benefit plans may
not be combined with other shares to qualify for the right of accumulation.
 
  Letter of Intention. Reduced sales charges are applicable to purchases
aggregating $25,000 or more of the Class A or Class D shares of the Fund or any
MLAM-advised mutual funds made within a 13-month period starting with the first
purchase pursuant to a Letter of Intention in the form provided in the
Prospectus. The Letter of Intention is available only to investors whose
accounts are maintained at the Fund's
 
                                       21
<PAGE>
 
Transfer Agent. The Letter of Intention is not available to employee benefit
plans for which Merrill Lynch provides plan participant, record keeping
services. The Letter of Intention is not a binding obligation to purchase any
amount of Class A or Class D shares; however, its execution will result in the
purchaser paying a lower sales charge at the appropriate quantity purchase
level. A purchase not originally made pursuant to a Letter of Intention may be
included under a subsequent Letter of Intention executed within 90 days of
such purchase if the Distributor is informed in writing of this intent within
such 90-day period. The value of Class A or Class D shares of the Fund and of
other MLAM-advised mutual funds presently held, at cost or maximum offering
price (whichever is higher), on the date of the first purchase under the
Letter of Intention, may be included as a credit toward the completion of such
Letter, but the reduced sales charge applicable to the amount covered by such
Letter will be applied only to new purchases. If the total amount of shares
does not equal the amount stated in the Letter of Intention (minimum of
$25,000), the investor will be notified and must pay, within 20 days of the
expiration of such Letter, the difference between the sales charge on the
Class A or Class D shares purchased at the reduced rate and the sales charge
applicable to the shares actually purchased through the Letter. Class A or
Class D shares equal to at least five percent of the intended amount will be
held in escrow during the 13-month period (while remaining registered in the
name of the purchaser) for this purpose. The first purchase under the Letter
of Intention must be at least five percent of the dollar amount of such
Letter. If a purchase during the term of such Letter would otherwise be
subject to a further reduced sales charge based on the right of accumulation,
the purchaser will be entitled on that purchase and subsequent purchases to
that further reduced percentage sales charge, but there will be no retroactive
reduction of the sales charges on any previous purchase. The value of any
shares redeemed or otherwise disposed of by the purchaser prior to termination
or completion of the Letter of Intention will be deducted from the total
purchases made under such Letter. An exchange from a MLAM-advised money market
fund into the Fund that creates a sales charge will count toward completing a
new or existing Letter of Intention from the Fund.
   
  Employee Access SM Accounts. Provided applicable threshold requirements are
met, either Class A or Class D shares are offered at net asset value to
Employee Access SM Accounts available through authorized employers. The
initial minimum for such accounts is $500, except that the initial minimum for
shares purchased for such accounts pursuant to the Automatic Investment
Program is $50.     
 
  TMA SM Managed Trusts. Class A shares are offered to TMA SM Managed Trusts
to which Merrill Lynch Trust Company provides discretionary trustee services
at net asset value.
   
  Purchase Privilege of Certain Persons. Trustees of the Trust, members of the
Boards of other MLAM-advised investment companies, ML & Co. and its
subsidiaries (the term "subsidiaries," when used herein with respect to ML &
Co., includes MLAM, the Manager and certain other entities directly or
indirectly wholly owned and controlled by ML & Co.), and their directors and
employees, and any trust, pension, profit-sharing or other benefit plan for
such persons, may purchase Class A shares of the Fund at net asset value.     
   
  Class D shares of the Fund are offered at net asset value, without a sales
charge, to an investor who has a business relationship with a Financial
Consultant who joined Merrill Lynch from another investment firm within six
months prior to the date of purchase by such investor, if the following
conditions are satisfied: first, the investor must advise Merrill Lynch that
it will purchase Class D shares of the Fund with proceeds from a redemption of
a mutual fund that was sponsored by the Financial Consultant's previous firm
and was subject to a sales charge either at the time of purchase or on a
deferred basis; and second, the investor also     
 
                                      22
<PAGE>
 
must establish that such redemption had been made within 60 days prior to the
investment in the Fund, and the proceeds from the redemption had been
maintained in the interim in cash or a money market fund.
   
  Class D shares of the Fund are also offered at net asset value, without a
sales charge, to an investor who has a business relationship with a Merrill
Lynch Financial Consultant and who has invested in a mutual fund sponsored by a
non-Merrill Lynch company for which Merrill Lynch has served as a selected
dealer and where Merrill Lynch has either received or given notice that such
arrangement will be terminated ("notice"), if the following conditions are
satisfied: first, the investor must purchase Class D shares of the Fund with
proceeds from a redemption of shares of such other mutual fund and the shares
of such other fund were subject to a sales charge either at the time of
purchase or on a deferred basis; and second, such purchase of Class D shares
must be made within 90 days after such notice.     
   
  Class D shares of the Fund are offered at net asset value, without a sales
charge, to an investor who has a business relationship with a Merrill Lynch
Financial Consultant and who has invested in a mutual fund for which Merrill
Lynch has not served as a selected dealer if the following conditions are
satisfied: first, the investor must advise Merrill Lynch that it will purchase
Class D shares of the Fund with proceeds from the redemption of shares of such
other mutual fund and that such shares have been outstanding for a period of no
less than six months; and second, such purchase of Class D shares must be made
within 60 days after the redemption and the proceeds from the redemption must
be maintained in the interim in cash or a money market fund.     
   
  Acquisition of Certain Investment Companies. The public offering price of
Class D shares may be reduced to the net asset value per Class D share in
connection with the acquisition of the assets of or merger or consolidation
with a personal holding company or a public or private investment company. The
value of the assets or company acquired in a tax-free transaction may be
adjusted in appropriate cases to reduce possible adverse tax consequences to
the Fund that might result from an acquisition of assets having net unrealized
appreciation that is disproportionately higher at the time of acquisition than
the realized or unrealized appreciation of the Fund. The issuance of Class D
shares for consideration other than cash is limited to bona fide
reorganizations, statutory mergers or other acquisitions of portfolio
securities that (i) meet the investment objectives and policies of the Fund,
(ii) are acquired for investment and not for resale (subject to the
understanding that the disposition of the Fund's portfolio securities shall at
all times remain within its control); and (iii) are liquid securities, the
value of which is readily ascertainable, which are not restricted as to
transfer either by law or liquidity of market (except that the Fund may acquire
through such transactions restricted or illiquid securities to the extent the
Fund does not exceed applicable limits on acquisition of such securities set
forth under "Investment Objective and Policies" herein).     
 
  Reductions in or exemptions from the imposition of a sales load are due to
the nature of the investors and/or the reduced sales efforts that will be
needed in obtaining such investments.
 
DISTRIBUTION PLANS
 
  Reference is made to "Purchase of Shares--Distribution Plans" in the
Prospectus for certain information with respect to the separate distribution
plans for Class B, Class C and Class D shares pursuant to Rule 12b-1 under the
1940 Act (each a "Distribution Plan") with respect to the account maintenance
and/or distribution fees paid by the Fund to the Distributor with respect to
such classes.
 
                                       23
<PAGE>
 
  Payments of the account maintenance and/or distribution fees are subject to
the provisions of Rule 12b-1 under the 1940 Act. Among other things, each
Distribution Plan provides that the Distributor shall provide and the Trustees
shall review quarterly reports of the disbursement of the account maintenance
and/or distribution fees paid to the Distributor. In their consideration of
each Distribution Plan, the Trustees must consider all factors they deem
relevant, including information as to the benefits of the Distribution Plan to
the Fund and its related class of shareholders. Each Distribution Plan further
provides that, so long as the Distribution Plan remains in effect, the
selection and nomination of Trustees who are not "interested persons" of the
Trust, as defined in the 1940 Act (the "Independent Trustees"), shall be
committed to the discretion of the Independent Trustees then in office. In
approving each Distribution Plan in accordance with Rule 12b-1, the Independent
Trustees concluded that there is reasonable likelihood that such Distribution
Plan will benefit the Fund and its related class of shareholders. Each
Distribution Plan can be terminated at any time, without penalty, by the vote
of a majority of the Independent Trustees or by the vote of the holders of a
majority of the outstanding related class of voting securities of the Fund. A
Distribution Plan cannot be amended to increase materially the amount to be
spent by the Fund without the approval of the related class of shareholders and
all material amendments are required to be approved by the vote of Trustees,
including a majority of the Independent Trustees who have no direct or indirect
financial interest in such Distribution Plan, cast in person at a meeting
called for that purpose. Rule 12b-1 further requires that the Trust preserve
copies of such Distribution Plan and any report made pursuant to such plan for
a period of not less than six years from the date of such Distribution Plan or
such report, the first two years in an easily accessible place.
 
LIMITATIONS ON THE PAYMENT OF DEFERRED SALES CHARGES
   
  The maximum sales charge rule in the Conduct Rules of the National
Association of Securities Dealers, Inc. (the "NASD") imposes a limitation on
certain asset-based sales charges such as the distribution fee and the CDSC
borne by the Class B and Class C shares but not the account maintenance fee.
The maximum sales charge rule is applied separately to each class. As
applicable to the Fund, the maximum sales charge rule limits the aggregate of
distribution fee payments and CDSCs payable by the Fund to (1) 6.25% of
eligible gross sales of Class B shares and Class C shares, computed separately
(defined to exclude shares issued pursuant to dividend reinvestments and
exchanges), plus (2) interest on the unpaid balance for the respective class,
computed separately, at the prime rate plus 1% (the unpaid balance being the
maximum amount payable minus amounts received from the payment of the
distribution fee and the CDSC). In connection with the Class B shares, the
Distributor has voluntarily agreed to waive interest charges on the unpaid
balance in excess of 0.50% of eligible gross sales. Consequently, the maximum
amount payable to the Distributor (referred to as the "voluntary maximum") in
connection with the Class B shares is 6.75% of eligible gross sales. The
Distributor retains the right to stop waiving the interest charges at any time.
To the extent payments would exceed the voluntary maximum, the Fund will not
make further payments of the distribution fee with respect to Class B shares,
and any CDSCs will be paid to the Fund rather than to the Distributor; however,
the Fund will continue to make payments of the account maintenance fee. In
certain circumstances the amount payable pursuant to the voluntary maximum may
exceed the amount payable under the NASD formula. In such circumstances payment
in excess of the amount payable under the NASD formula will not be made.     
   
  The following table sets forth comparative information as of July 31, 1997
with respect to the Class B and Class C shares of the Fund indicating the
maximum allowable payments that can be made under the     
 
                                       24
<PAGE>
 
NASD maximum sales charge rule and, with respect to the Class B shares, the
Distributor's voluntary maximum.
 
<TABLE>   
<CAPTION>
                                       DATA CALCULATED AS OF JULY 31, 1997
                  ------------------------------------------------------------------------------
                                                                                      ANNUAL
                           ALLOWABLE  ALLOWABLE             AMOUNTS                DISTRIBUTION
                  ELIGIBLE AGGREGATE INTEREST ON MAXIMUM   PREVIOUSLY   AGGREGATE FEE AT CURRENT
                   GROSS     SALES     UNPAID    AMOUNT     PAID TO      UNPAID     NET ASSET
                  SALES(1)  CHARGES  BALANCE(2)  PAYABLE DISTRIBUTOR(3)  BALANCE     LEVEL(4)
                  -------- --------- ----------- ------- -------------- --------- --------------
<S>               <C>      <C>       <C>         <C>     <C>            <C>       <C>            
                                                  (IN THOUSANDS)
CLASS B SHARES,
 FOR THE PERIOD
 FEBRUARY 28,
 1992
 (COMMENCEMENT
 OF OPERATIONS)
 TO JULY 31,
 1997:
Under NASD Rule
 As Adopted.....  $96,604   $6,038     $2,215    $8,253      $1,776      $6,477        $133
Under Distribu-
 tor's Voluntary
 Waiver.........  $96,604   $6,038     $  483    $6,521      $1,776      $4,745        $133

CLASS C SHARES,
 FOR THE PERIOD
 OCTOBER 21,
 1994
 (COMMENCEMENT
 OF OPERATIONS)
 TO JULY 31,
 1997:
Under NASD Rule
 As Adopted.....  $ 2,341   $  146     $   17    $  163      $   12      $  151        $  5

</TABLE>    
- --------
(1) Purchase price of all eligible Class B or Class C shares sold during the
    periods indicated other than shares acquired through dividend reinvestment
    and the exchange privilege.
(2) Interest is computed on a monthly basis based upon the prime rate, as
    reported in The Wall Street Journal, plus 1%, as permitted under the NASD
    Rule.
   
(3) Consists of CDSC payments, distribution fee payments and accruals. See
    "Purchase of Shares--Distribution Plans" in the Prospectus. This figure
    may include CDSCs that were deferred when a shareholder redeemed shares
    prior to the expiration of the applicable CDSC period and invested the
    proceeds, without the imposition of a sales charge, in Class A shares in
    conjunction with the shareholder's participation in the Merrill Lynch
    Mutual Funds Advisor ("MFA") Program. The CDSC is booked as a contingent
    obligation that may be payable if the shareholder terminates participation
    in the MFA Program.     
(4) Provided to illustrate the extent to which the current level of
    distribution fee payments (not including any CDSC payments) is amortizing
    the unpaid balance. No assurance can be given that payments of the
    distribution fee will reach either the voluntary maximum or the NASD
    maximum.
 
                             REDEMPTION OF SHARES
 
  Reference is made to "Redemption of Shares" in the Prospectus for certain
information as to the redemption and repurchase of Fund shares.
   
  The right to redeem shares or to receive payment with respect to any such
redemption may be suspended for more than seven days only for any period
during which trading on the NYSE is restricted as determined by the Commission
or the NYSE is closed (other than customary weekend and holiday closings), for
any period during which an emergency exists, as defined by the Commission, as
a result of which disposal of portfolio securities or determination of the net
asset value of the Fund is not reasonably practicable, and for such other
periods as the Commission may by order permit for the protection of
shareholders of the Fund.     
   
  The value of shares at the time of the redemption may be more or less than
the shareholder's cost, depending on the market value of the securities held
by the Fund at such time.     
 
                                      25
<PAGE>
 
DEFERRED SALES CHARGES--CLASS B AND CLASS C SHARES
   
  As discussed in the Prospectus under "Purchase of Shares--Deferred Sales
Charge Alternatives--Class B and Class C Shares," while Class B shares redeemed
within four years of purchase are subject to a CDSC under most circumstances,
the charge is waived on redemptions of Class B shares in certain circumstances
including following the death or disability of a Class B shareholder.
Redemptions for which the waiver applies are any partial or complete redemption
following the death or disability (as defined in the Internal Revenue Code of
1986 as amended (the "Code")) of a Class B shareholder (including one who owns
the Class B shares as joint tenant with his or her spouse), provided the
redemption is requested within one year of the death or initial determination
of disability. For the fiscal years ended July 31, 1995, 1996 and 1997, the
Distributor received CDSCs of $294,149, $166,231 and $81,715, respectively,
with respect to redemptions of Class B shares, all of which were paid to
Merrill Lynch. Additional CDSCs payable to the Distributor during the fiscal
year ended July 31, 1997, may have been waived or converted to a contingent
obligation in connection with a shareholder's participation in certain fee-
based programs. For the fiscal period October 21, 1994 (commencement of
operations) to July 31, 1995 and for the fiscal years ended July 31, 1996 and
1997, the Distributor received CDSCs of $73, $2,058 and $1,089, respectively,
with respect to redemptions of Class C shares, all of which were paid to
Merrill Lynch.     
 
                             PORTFOLIO TRANSACTIONS
 
  Reference is made to "Investment Objective and Policies" and "Portfolio
Transactions" in the Prospectus.
   
  Under the 1940 Act, persons affiliated with the Trust are prohibited from
dealing with the Fund as a principal in the purchase and sale of securities
unless such trading is permitted by an exemptive order issued by the
Commission. Since over-the-counter ("OTC") transactions are usually principal
transactions, affiliated persons of the Trust, including Merrill Lynch, may not
serve as dealer in connection with transactions with the Fund. The Trust has
obtained an exemptive order permitting it to engage in certain principal
transactions with Merrill Lynch involving high quality short-term municipal
bonds subject to certain conditions. For the year ended July 31, 1995, the Fund
engaged in 19 transactions pursuant to such order for an aggregate market value
of $17,100,000. For the year ended July 31, 1996, the Fund engaged in five
transactions pursuant to such order for an aggregate market value of
$2,800,000. For the year ended July 31, 1997, the Fund engaged in 4
transactions pursuant to such order for an aggregate market value of
$2,100,000. Affiliated persons of the Trust may serve as broker for the Fund in
over-the-counter transactions conducted on an agency basis. Certain court
decisions have raised questions as to the extent to which investment companies
should seek exemptions under the 1940 Act in order to seek to recapture
underwriting and dealer spreads from affiliated entities. The Trustees have
considered all factors deemed relevant, and have made a determination not to
seek such recapture at this time. The Trustees will reconsider this matter from
time to time.     
   
  The Fund may not purchase securities, including Municipal Bonds, during the
existence of any underwriting syndicate of which Merrill Lynch is a member or
in a private placement in which Merrill Lynch serves as placement agent except
pursuant to procedures approved by the Trustees of the Trust which either
comply with rules adopted by the Commission or with interpretations of the
Commission Staff. Rule 10f-3 under the 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 which may be purchased in any one issue and
the assets of the Fund which may be invested in a particular issue.     
 
                                       26
<PAGE>
 
  The Fund does not expect to use any particular dealer in the execution of
transactions but, subject to obtaining the best net results, dealers who
provide supplemental investment research (such as information concerning tax-
exempt securities, economic data and market forecasts) to the Manager may
receive orders for transactions by the Fund. Information so received will be in
addition to and not in lieu of the services required to be performed by the
Manager under its Management Agreement and the expenses of the Manager will not
necessarily be reduced as a result of the receipt of such supplemental
information.
 
  The Trust has no obligation to deal with any broker in the execution of
transactions for the Fund's portfolio securities. In addition, consistent with
the Conduct Rules of the NASD and policies established by the Trustees of the
Trust, the Manager may consider sales of shares of the Fund as a factor in the
selection of brokers or dealers to execute portfolio transactions for the Fund.
   
  Generally, the Fund does not purchase securities for short-term trading
profits. However, the Fund may dispose of securities without regard to the time
they have been held when such action, for defensive or other reasons, appears
advisable to its Manager. As a result of the investment policies described in
the Prospectus, the Fund's annual portfolio turnover rate may be higher than
that of other investment companies, under normal circumstances. The portfolio
turnover rate is calculated by dividing the lesser of purchases or sales of
portfolio securities for the particular fiscal year by the monthly average of
the value of the portfolio securities owned by the Fund during the particular
fiscal year. For purposes of determining this rate, all securities whose
maturities at the time of acquisition are one year or less are excluded. The
portfolio turnover for the years ended July 31, 1996 and 1997 was 56.05% and
24.64%, respectively.     
   
  Section 11(a) of the Securities and Exchange Act of 1934, as amended,
generally prohibits members of the U.S. national securities exchanges from
executing exchange transactions for their affiliates and institutional accounts
that they manage unless the member (i) has obtained prior express authorization
from the account to effect such transactions, (ii) at least annually furnishes
the account with a statement setting forth the aggregate compensation received
by the member in effecting such transactions, and (iii) complies with any rules
the Commission has prescribed with respect to the requirements of clauses (i)
and (ii). To the extent Section 11(a) would apply to Merrill Lynch acting as a
broker for the Fund in any of its portfolio transactions executed on any such
securities exchange of which it is a member, appropriate consents have been
obtained from the Fund and annual statements as to aggregate compensation will
be provided to the Fund.     
 
                        DETERMINATION OF NET ASSET VALUE
   
  Reference is made to "Additional Information--Determination of Net Asset
Value" in the Prospectus for information concerning the determination of net
asset value.     
   
  The net asset value of the shares of all classes of the Fund is determined by
the Manager once daily, Monday through Friday, as of 15 minutes after the close
of business on the NYSE (generally, 4:00 p.m., New York time) on each 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. Net asset
value per share is computed by dividing the sum of the value of the securities
held by the Fund plus any cash or other assets (including interest and
dividends     
 
                                       27
<PAGE>
 
   
accrued but not yet received) minus all liabilities (including accrued
expenses) by the total number of shares outstanding at such time, rounded to
the nearest cent. Expenses, including the fees payable to the Manager and
Distributor, are accrued daily. The per share net asset value of Class B, Class
C and Class D shares generally will be lower than the per share net asset value
of Class A shares, reflecting the daily expense accruals of the account
maintenance, distribution fees, and higher transfer agency fees applicable with
respect to the Class B and Class C shares and the daily expense accruals of the
account maintenance fees with respect to Class D shares; moreover, the per
share net asset value of Class B and Class C shares generally will be lower
than the per share net asset value of Class D shares, reflecting the daily
expense accruals of the distribution fees, higher account maintenance fees and
higher transfer agency fees applicable with respect to Class B and Class C
shares of the Fund. It is expected, however, that the per share net asset value
of the four classes will tend to converge (although not necessarily meet)
immediately after the payment of dividends, which will differ by approximately
the amount of the expense accrual differentials between the classes.     
   
  The Municipal Bonds and other portfolio securities in which the Fund invests
are traded primarily in OTC municipal bond and money markets and are valued at
the last available bid price in the OTC market or on the basis of yield
equivalents as obtained from one or more dealers that make markets in the
securities. One bond is the "yield equivalent" of another bond when, taking
into account market price, maturity, coupon rate, credit rating and ultimate
return of principal, both bonds will theoretically produce an equivalent return
to the bondholder. Financial futures contracts and options thereon, which are
traded on exchanges, are valued at their settlement prices as of the close of
such exchanges. Short-term investments with a remaining maturity of 60 days or
less are valued on an amortized cost basis, which approximates market value.
Securities and assets for which market quotations are not readily available are
valued at fair value as determined in good faith by or under the direction of
the Trustees of the Trust, including valuations furnished by a pricing service
retained by the Trust, which may utilize a matrix system for valuations. The
procedures of the pricing service and its valuations are reviewed by the
officers of the Trust under the general supervision of the Trustees.     
 
                              SHAREHOLDER SERVICES
 
  The Trust offers a number of shareholder services described below which are
designed to facilitate investment in shares of the Fund. Full details as to
each of such services and copies of the various plans described below can be
obtained from the Trust, the Distributor or Merrill Lynch.
 
INVESTMENT ACCOUNT
 
  Each shareholder whose account is maintained at the Transfer Agent has an
Investment Account and will receive statements, at least quarterly, from the
Transfer Agent. These statements will serve as transaction confirmations for
automatic investment purchases and the reinvestment of ordinary income
dividends and long-term capital gains distributions. These statements will also
show any other activity in the account since the previous statement.
Shareholders also will receive separate confirmations for each purchase or sale
transaction other than automatic investment purchases and the reinvestment of
ordinary income dividends and long-term capital gains distributions. A
shareholder may make additions to his or her Investment Account at any time by
mailing a check directly to the Transfer Agent.
 
  Share certificates are issued only for full shares and only upon the specific
request of the shareholder who has an Investment Account. Issuance of
certificates representing all or only part of the full shares in an Investment
Account may be requested by a shareholder directly from the Transfer Agent.
 
                                       28
<PAGE>
 
   
  Shareholders considering transferring their Class A or Class D shares from
Merrill Lynch to another brokerage firm or financial institution should be
aware that, if the firm to which the Class A or Class D shares are to be
transferred will not take delivery of shares of the Fund, a shareholder either
must redeem the Class A or Class D shares (paying any applicable CDSC) so that
the cash proceeds can be transferred to the account at the new firm or continue
to maintain an Investment Account at the Transfer Agent for those Class A or
Class D shares. Shareholders interested in transferring their Class B or Class
C shares from Merrill Lynch and who do not wish to have an Investment Account
maintained for such shares at the Transfer Agent may request their new
brokerage firm to maintain such shares in an account registered in the name of
the brokerage firm for the benefit of the shareholder at the Transfer Agent. If
the new brokerage firm is willing to accommodate the shareholder in this
manner, the shareholder must request that he or she be issued certificates for
his or her shares, and then must turn the certificates over to the new firm for
re-registration as described in the preceding sentence.     
 
AUTOMATIC INVESTMENT PLANS
 
  A shareholder may make additions to an Investment Account at any time by
purchasing Class A shares (if he or she is an eligible Class A investor as
described in the Prospectus) or Class B, Class C or Class D shares at the
applicable public offering price either through the shareholder's securities
dealer, or by mail directly to the Transfer Agent, acting as agent for such
securities dealers. Voluntary accumulation also can be made through a service
known as the Fund's Automatic Investment Plan whereby the Fund is authorized
through pre-authorized checks or automatic clearing house debits of $50 or more
to charge the regular bank account of the shareholder on a regular basis to
provide systematic additions to the Investment Account of such shareholder.
Alternatively, investors who maintain CMA (R) or CBA (R) accounts may arrange
to have periodic investments made in the Fund in their CMA (R) or CBA (R)
account or in certain related accounts in amounts of $100 or more through the
CMA(R) or CBA(R) Automated Investment Program.
 
AUTOMATIC REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS
 
  Unless specific instructions are given as to the method of payment of
dividends and capital gains distributions, dividends and distributions will be
automatically reinvested in additional shares of the Fund. Such reinvestment
will be at the net asset value of shares of the Fund as of the close of
business on the monthly payment date for such dividends and distributions.
Shareholders may elect in writing to receive either their income dividends or
capital gains distributions, or both, in cash, in which event payment will be
mailed on or about the payment date.
   
  Shareholders may, at any time, notify Merrill Lynch in writing if their
account is maintained with Merrill Lynch or notify the Transfer Agent in
writing or by telephone (1-800-MER-FUND) if their account is maintained with
the Transfer Agent that they no longer wish to have their dividends and/or
capital gains distributions reinvested in shares of the Fund or vice versa and,
commencing ten days after the receipt by the Transfer Agent of such notice,
such instructions will be effected.     
   
SYSTEMATIC WITHDRAWAL PLANS     
   
  A shareholder may elect to make systematic withdrawals from an Investment
Account on either a monthly or quarterly basis as provided below. Quarterly
withdrawals are available for shareholders who have acquired shares of the Fund
having a value, based on cost or the current offering price, of $5,000 or more,
and monthly withdrawals are available for shareholders with shares with such a
value of $10,000 or more.     
 
                                       29
<PAGE>
 
   
  At the time of each withdrawal payment, sufficient shares are redeemed from
those on deposit in the shareholder's account to provide the withdrawal
payment specified by the shareholder. The shareholder may specify the dollar
amount and class of shares to be redeemed. Redemptions will be made at net
asset value as determined 15 minutes after the close of business on the NYSE
(generally, 4:00 p.m., New York time) on the 24th day of each month or the
24th day of the last month of each quarter, whichever is applicable. If the
NYSE is not open for business on such date, the shares will be redeemed at the
close of business on the following business day. The check for the withdrawal
payment will be mailed, or the direct deposit for the withdrawal payment will
be made, on the next business day following redemption. When a shareholder is
making systematic withdrawals, dividends and distributions on all shares in
the Investment Account are reinvested automatically in Fund shares. A
shareholder's Systematic Withdrawal Plan may be terminated at any time,
without charge or penalty, by the shareholder, the Trust, the Transfer Agent
or the Distributor.     
   
  With respect to redemptions of Class B or Class C shares pursuant to a
systematic withdrawal plan, the maximum number of Class B or Class C shares
that can be redeemed from an account annually shall not exceed 10% of the
value of shares of such class in that account at the time the election to join
the systematic withdrawal plan was made. Any CDSC that otherwise might be due
on such redemption of Class B or Class C shares will be waived. Shares
redeemed pursuant to systematic withdrawal plan will be redeemed in the same
order as Class B or Class C shares are otherwise redeemed. See "Purchase of
Shares--Deferred Sales Charge Alternatives-Class B and Class C Shares--
Contingent Deferred Sales Charges-Class B Shares" and "--Contingent Deferred
Sales Charges-Class C Shares." Where the systematic withdrawal plan is applied
to Class B shares, upon conversion of the last Class B shares in an account to
Class D shares, the systematic withdrawal plan will automatically be applied
thereafter to Class D shares. See "Purchase of Shares--Deferred Sales Charge
Alternatives-Class B and Class C Shares--Conversion of Class B Shares to Class
D Shares" in the Prospectus; if an investor wishes to change the amount being
withdrawn in a systematic withdrawal plan the investor should contact his or
her Financial Consultant.     
   
  Withdrawal payments should not be considered as dividends, yield or income.
Each withdrawal is a taxable event. If periodic withdrawals continuously
exceed reinvested dividends, the shareholder's original investment may be
reduced correspondingly. Purchases of additional shares concurrent with
withdrawals are ordinarily disadvantageous to the shareholder because of sales
charges and tax liabilities. The Trust will not knowingly accept purchase
orders for shares of the Fund from investors who maintain a Systematic
Withdrawal Plan unless such purchase is equal to at least one year's scheduled
withdrawals or $1,200, whichever is greater. Periodic investments may not be
made into an Investment Account in which the shareholder has elected to make
systematic withdrawals.     
   
  Alternatively, a shareholder whose shares are held within a CMA (R) or
CBA (R) Account may elect to have shares redeemed on a monthly, bimonthly,
quarterly, semiannual or annual basis through the CMA (R) or CBA (R)
Systematic Redemption Program. The minimum fixed dollar amount redeemable is
$50. The proceeds of systematic redemptions will be posted to the
shareholder's account three business days after the date the shares are
redeemed. All redemptions are made at net asset value. A shareholder may elect
to have his or her shares redeemed on the first, second, third or fourth
Monday of each month, in the case of monthly redemptions, or of every other
month, in the case of bimonthly redemptions. For quarterly, semiannual or
annual redemptions, the shareholder may select the month in which the shares
are to be redeemed and may designate whether the redemption is to be made on
the first, second, third or fourth Monday of the month. If     
 
                                      30
<PAGE>
 
   
the Monday selected is not a business day, the redemption will be processed at
net asset value on the next business day. The Systematic Redemption Program is
not available if Fund shares are being purchased within the account pursuant to
the Automatic Investment Program. For more information on the CMA (R) or
CBA (R) Systematic Redemption Program, eligible shareholders should contact
their Financial Consultant.     
 
EXCHANGE PRIVILEGE
   
  U.S. shareholders of each class of shares of the Fund have an exchange
privilege with certain other MLAM-advised mutual funds. Under the Merrill Lynch
Select Pricing SM System, Class A shareholders may exchange Class A shares of
the Fund for Class A shares of a second MLAM-advised mutual fund if the
shareholder holds any Class A shares of the second fund in his or her account
in which the exchange is made at the time of the exchange or is otherwise
eligible to purchase Class A shares of the second fund. If the Class A
shareholder wants to exchange Class A shares for shares of a second MLAM-
advised mutual fund, but does not hold Class A shares of the second fund in his
or her account at the time of the exchange and is not otherwise eligible to
acquire Class A shares of the second fund, the shareholder will receive Class D
shares of the second fund as a result of the exchange. Class D shares also may
be exchanged for Class A shares of a second MLAM-advised mutual fund at any
time as long as, at the time of the exchange, the shareholder holds Class A
shares of the second fund in the account in which the exchange is made or is
otherwise eligible to purchase Class A shares of the second fund. Class B,
Class C and Class D shares are exchangeable with shares of the same class of
other MLAM-advised mutual funds. For purposes of computing the CDSC that may be
payable upon a disposition of the shares acquired in the exchange, the holding
period for the previously owned shares of the Fund is "tacked" to the holding
period for the newly acquired shares of the other fund as more fully described
below. Class A, Class B, Class C and Class D shares are also exchangeable for
shares of certain MLAM-advised money market funds as follows: Class A shares
may be exchanged for shares of Merrill Lynch Ready Assets Trust, Merrill Lynch
Retirement Reserves Money Fund (available only for exchanges within certain
retirement plans), Merrill Lynch U.S.A. Government Reserves and Merrill Lynch
U.S. Treasury Money Fund; Class B, Class C and Class D shares may be exchanged
for shares of Merrill Lynch Government Fund, Merrill Lynch Institutional Fund,
Merrill Lynch Institutional Tax-Exempt Fund and Merrill Lynch Treasury Fund.
Shares with a net asset value of at least $100 are required to qualify for the
exchange privilege, and any shares utilized in an exchange must have been held
by the shareholder for at least 15 days. It is contemplated that the exchange
privilege may be applicable to other new mutual funds whose shares may be
distributed by the Distributor.     
 
  Exchanges of Class A or Class D shares outstanding ("outstanding Class A or
Class D shares") for Class A or Class D shares of another MLAM-advised mutual
fund ("new Class A or Class D shares") are transacted on the basis of relative
net asset value per Class A or Class D share, respectively, plus an amount
equal to the difference, if any, between the sales charge previously paid on
the outstanding Class A or Class D shares and the sales charge payable at the
time of the exchange on the new Class A or Class D shares. With respect to
outstanding Class A or Class D shares as to which previous exchanges have taken
place, the "sales charge previously paid" shall include the aggregate of the
sales charges paid with respect to such Class A or Class D shares in the
initial purchase and any subsequent exchange. Class A or Class D shares issued
pursuant to dividend reinvestment are sold on a no-load basis in each of the
funds offering Class A or Class D shares. For purposes of the exchange
privilege, Class A or Class D shares acquired through dividend reinvestment
shall be deemed to have been sold with a sales charge equal to the sales charge
previously paid
 
                                       31
<PAGE>
 
   
on the Class A or Class D shares on which the dividend was paid. Based on this
formula, Class A or Class D shares of the Fund generally may be exchanged into
the Class A or Class D shares of the other funds or into shares of certain
money market funds with a reduced or without a sales charge.     
   
  In addition, each of the funds with Class B or Class C shares outstanding
("outstanding Class B or Class C shares") offers to exchange its Class B or
Class C shares for Class B or Class C shares, respectively, of another MLAM-
advised mutual fund ("new Class B or Class C shares") on the basis of relative
net asset value per Class B or Class C share, without the payment of any CDSC
that might otherwise be due on redemption of the outstanding shares. Class B
shareholders of the Fund exercising the exchange privilege will continue to be
subject to the Fund's CDSC schedule if such schedule is higher than the CDSC
schedule relating to the new Class B shares acquired through use of the
exchange privilege. In addition, Class B shares of the Fund acquired through
use of the exchange privilege will be subject to the Fund's CDSC schedule if
such schedule is higher than the CDSC schedule relating to the Class B shares
of the fund from which the exchange has been made. For purposes of computing
the sales charge that may be payable on a disposition of the new Class B or
Class C shares, the holding period for the outstanding Class B or Class C
shares is "tacked" to the holding period of the new Class B or Class C shares.
For example, an investor may exchange Class B shares of the Fund for those of
Merrill Lynch Special Value Fund, Inc. ("Special Value Fund") after having held
the Fund's Class B shares for two and a half years. The 2% CDSC that generally
would apply to a redemption would not apply to the exchange. Three years later
the investor may decide to redeem the Class B shares of the Special Value Fund
and receive cash. There will be no CDSC due on this redemption, since by
"tacking" the two and a half year holding period of the Fund's Class B shares
to the three year holding period for the Special Value Fund Class B shares, the
investor will be deemed to have held the Special Value Class B shares for more
than five years.     
   
  Shareholders also may exchange shares of the Fund into shares of certain
money market funds advised by the Manager or its affiliates, but the period of
time that Class B or Class C shares are held in a money market fund will not
count towards satisfaction of the holding period requirement for purposes of
reducing the CDSC or, with respect to the Class B shares, towards satisfaction
of the conversion period. However, shares of a money market fund that were
acquired as a result of an exchange for Class B or Class C shares of the Fund
may, in turn, be exchanged back into Class B or Class C shares, respectively,
of any fund offering such shares, in which event the holding period for Class B
or Class C shares of the newly-acquired fund will be aggregated with previous
holding periods for purposes of reducing the CDSC. Thus, for example, an
investor may exchange Class B shares of the Fund for shares of Merrill Lynch
Institutional Fund ("Institutional Fund") after having held the Fund Class B
shares for two and a half years and three years later decide to redeem the
shares of the Institutional Fund for cash. At the time of this redemption, the
2% CDSC that would have been due had the Class B shares of the Fund been
redeemed for cash rather than exchanged for shares of the Institutional Fund
will be payable. If, instead of such redemption the shareholder exchanged such
shares for Class B shares of a fund that the shareholder continued to hold for
an additional two and a half years, any subsequent redemption would not incur a
CDSC.     
 
  Before effecting an exchange, shareholders of the Fund should obtain a
currently effective prospectus of the fund into which the exchange is to be
made.
   
  To exercise the exchange privilege, a shareholder should contact his or her
Merrill Lynch Financial Consultant, who will advise the Fund of the exchange.
Shareholders of the Fund, and shareholders of the other MLAM-advised funds
described above with shares for which certificates have not been issued, may
exercise the exchange privilege by wire through their securities dealers. The
Fund reserves the right to require     
 
                                       32
<PAGE>
 
a properly completed Exchange Application. This exchange privilege may be
modified or terminated at any time in accordance with the rules of the
Commission. The Fund reserves the right to limit the number of times an
investor may exercise the exchange privilege. Certain funds may suspend the
continuous offering of their shares at any time and thereafter may resume such
offering from time to time. The exchange privilege is available only to U.S.
shareholders in states where the exchange legally may be made.
 
                            DISTRIBUTIONS AND TAXES
   
  The Trust intends to continue to qualify the Fund for the special tax
treatment afforded regulated investment companies ("RICs") under the Code. As
long as it so qualifies, 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 Trust intends to cause
the Fund to distribute substantially all of such income. So long as the Fund
qualifies as a regulated investment company under the Code, it will not be
subject to any Massachusetts income tax.     
 
  As discussed in the Fund's Prospectus, the Trust has established other series
in addition to the Fund (together with the Fund, the "Series"). Each Series of
the Trust is treated as a separate corporation for Federal income tax purposes.
Each Series, therefore, is considered to be a separate entity in determining
its treatment under the rules for RICs described in the Prospectus. Losses in
one Series do not offset gains in another Series, and the requirements (other
than certain organizational requirements) for qualifying for RIC status are
determined at the Series level rather than at the Trust level.
 
  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 Trust intends to qualify the Fund 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 the Fund's 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 shall be qualified
to pay exempt-interest dividends to its Class A, Class B, Class C and Class D
shareholders (together, the "shareholders"). Exempt-interest dividends are
dividends or any part thereof paid by the Fund that are attributable to
interest on tax-exempt obligations and designated by the Trust as exempt-
interest dividends in a written notice mailed to the Fund's shareholders within
60 days after the close of the Fund's taxable year. For this purpose, the Fund
will allocate interest from tax-exempt obligations (as well as ordinary income,
capital gains, including new categories of capital gains, and tax preference
items, discussed below) among the Class A, Class B, Class C and Class D
shareholders according to a method (which it believes is consistent with the
Commission rule permitting the issuance and sale of multiple classes of shares)
that is based on the gross income allocable to Class A, Class B, Class C and
Class D shareholders during the taxable year or such other method as the
Internal Revenue Service may prescribe. To the extent that the dividends
distributed to the Fund's shareholders are derived from interest income exempt
from Federal income 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     
 
                                       33
<PAGE>
 
   
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 shares of a
RIC paying exempt-interest dividends, such as the Fund, will not be deductible
by the investor for Federal income tax or Massachusetts corporate excise tax
purposes, to the extent attributable to exempt-interest dividends. Shareholders
are advised to consult their tax advisors with respect to whether exempt-
interest dividends retain the exclusion under Code Section 103(a) if a
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.     
   
  The portion of the Fund's exempt-interest dividends directly attributable to
interest received by the Fund from Massachusetts Municipal Bonds and properly
identified in a year-end statement ("Massachusetts exempt-interest dividends")
also will be exempt from Massachusetts personal income taxes. Interest on
indebtedness incurred or continued to purchase or carry shares of the Fund will
not be deductible for Massachusetts personal income tax purposes to the extent
attributable to Massachusetts exempt-interest dividends. Corporate shareholders
and shareholders subject to income taxation by states other than Massachusetts
will realize a lower after tax rate of return than Massachusetts shareholders
since the dividends distributed by the Fund generally will not be exempt, to
any significant degree, from the Massachusetts corporate excise tax or from
income taxation by such other states. The Trust will inform shareholders
annually regarding the portion of the Fund's distributions that constitutes
exempt-interest dividends and the portion that constitutes Massachusetts
exempt-interest dividends. The Fund will allocate exempt-interest dividends
among Class A, Class B, Class C and Class D shareholders for Massachusetts
income tax purposes based on a method similar to that described above for
Federal income tax purposes.     
   
  Distributions from investment income and capital gains of the Fund, including
exempt-interest dividends, will be subject to the Massachusetts corporate
excise tax and may also be subject to state taxes in states other than
Massachusetts and local taxes. The value of Fund shares owned by a corporation
also may be subject to the property component of the Massachusetts corporate
excise tax, and to taxes in other states that tax intangible property.
Accordingly, investors in the Fund, including, in particular, corporate
investors which may be subject to the Massachusetts corporate excise tax,
should consult their tax advisors with respect to the application of such taxes
to an investment in the Fund and to the receipt of Fund dividends and with
respect to their Massachusetts tax situation in general.     
   
  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 taxable ordinary income for Federal income tax purposes and taxable
dividend income for Massachusetts 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, and for Massachusetts income tax purposes will be taxed
as capital gain income, unless they are attributable to the sale of certain
Massachusetts Municipal Bonds issued pursuant to legislation that specifically
exempts capital gains on their sale from Massachusetts personal income
taxation. Recent legislation creates additional categories of capital gains
taxable at different rates for Federal income tax purposes, there also are
different long-term capital gains rates for Massachusetts personal income tax
purposes. Although the legislation does not explain how gain in     
 
                                       34
<PAGE>
 
   
these categories will be taxed to shareholders of RICs, it authorizes
regulations applying the new categories of gain and the new rates to sales of
securities by RICs. In the absence of guidance, there is some uncertainty as
to the manner in which the categories of gain and related rates will be passed
through to shareholders in capital gain dividends. It is anticipated that IRS
guidance permitting categories of gain and related rates to be passed through
to shareholders would also require the Fund to designate the amounts of
various categories of capital gain income included in capital gain dividends
in a written notice sent to shareholders. For Massachusetts personal income
tax purposes, proposed regulations have been issued that would, if finalized,
permit different classes of capital gains to be passed through to RIC
shareholders. Distributions by the Fund, whether from exempt-interest income,
ordinary income or capital gains, will not be 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 Fund 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 specific date in
one of such months, then such dividend will be treated for tax purposes as
being paid by the Fund and received by its shareholders on December 31 of the
year in which such dividend was declared.
   
  The Code subjects interest received on certain otherwise tax-exempt
securities to an alternative minimum tax. The alternative minimum tax applies
to interest received on certain "private activity bonds" issued after August
7, 1986. Private activity bonds are bonds which, although tax-exempt, are used
for purposes other than those generally performed by governmental units and
which 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 certain investors in such
bonds, including shareholders of the Fund, to an alternative minimum tax. The
Fund will purchase such "private activity bonds," and the Trust will report to
shareholders within 60 days after the Fund's taxable year-end the portion of
the Fund's 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 alternative minimum tax on
exempt-interest dividends paid by the Fund.     
   
  The Fund may invest in high yield securities as described in the Prospectus.
Furthermore, the Fund may also invest in instruments the return on which
includes nontraditional features such as indexed principal or interest
payments ("non-traditional 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.     
 
                                      35
<PAGE>
 
  No gain or loss will be recognized by Class B shareholders on the conversion
of their Class B shares into Class D shares. A shareholder's basis in the Class
D shares acquired will be the same as such shareholder's basis in the Class B
shares converted, and the holding period of the acquired Class D shares will
include the holding period for the converted Class B shares.
 
  If a shareholder exercises an exchange privilege within 90 days of acquiring
the shares, then the loss the shareholder can recognize on the exchange will be
reduced (or the gain increased) to the extent any sales charge paid to the Fund
on the exchanged shares reduces any sales charge such shareholder would have
owed upon purchase of the new shares in the absence of the exchange privilege.
Instead, such sales charge will be treated as an amount paid for the new
shares.
 
  A loss realized on a sale or exchange of shares of the Fund will be
disallowed if other Fund shares are acquired (whether through the automatic
reinvestment of dividends or otherwise) within a 61-day period beginning 30
days before and ending 30 days after the date that the shares are disposed of.
In such a case, the basis of the shares acquired will be adjusted to reflect
the disallowed loss.
 
  Ordinary income dividends paid to shareholders who are nonresident aliens or
foreign entities will be subject to a 30% U.S. 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 advisors concerning the applicability of the U.S. withholding tax.
 
  Under certain Code provisions, some shareholders 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 will be those for whom no certified
taxpayer identification number is on file with the Trust or who, to the Trust'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.
          
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 these 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     
 
                                       36
<PAGE>
 
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.
   
  One of the requirements for qualification as a RIC is that less than 30% of
the Fund's gross income be derived from gains from the sale or other
disposition of securities held for less than three months. Accordingly, the
Fund may be restricted in effecting closing transactions within three months
after entering into an option or financial futures contract. Under recently
enacted legislation, this requirement will no longer apply to the Fund after
the fiscal year ending July 31, 1998.     
       
  The foregoing is a general and abbreviated summary of the applicable
provisions of the Code, Treasury regulations and Massachusetts tax laws
presently in effect. For the complete provisions, reference should be made to
the pertinent Code sections, the Treasury regulations promulgated thereunder
and the applicable Massachusetts personal income and corporate excise tax laws.
The Code and the Treasury regulations, as well as the Massachusetts tax laws,
are subject to change by legislative, judicial or administrative action either
prospectively or retroactively.
 
  Shareholders are urged to consult their own tax advisors regarding the
availability of any exemptions from state or local taxes (other than those
imposed by Massachusetts) and with specific questions as to Federal, foreign,
state or local taxes.
 
                                PERFORMANCE DATA
 
  From time to time the Fund may include its average annual total return and
other total return data, as well as yield and tax-equivalent yield, in
advertisements or information furnished to present or prospective shareholders.
From time to time, the Fund may include the Fund's Morningstar risk-adjusted
performance ratings in advertisements or supplemental sales literature. Total
return and yield and tax-equivalent yield figures are based on the Fund's
historical performance and are not intended to indicate future performance.
Average annual total return, yield and tax-equivalent yield are determined
separately for Class A, Class B, Class C and Class D shares in accordance with
formulas specified by the Commission.
 
  Average annual total return quotations for the specified periods are computed
by finding the average annual compounded rates of return (based on net
investment income and any realized and unrealized capital gains or losses on
portfolio investments over such periods) that would equate the initial amount
invested to the redeemable value of such investment at the end of each period.
Average annual total return is computed assuming all dividends and
distributions are reinvested and taking into account all applicable recurring
and nonrecurring expenses, including the maximum sales charge in the case of
Class A and Class D shares and the CDSC that would be applicable to a complete
redemption of the investment at the end of the specified period in the case of
the Class B and Class C shares.
 
  The Fund also may quote annual, average annual and annualized total return
and aggregate total return performance data, both as a percentage and as a
dollar amount based on a hypothetical $1,000 investment, for various periods
other than those noted below. Such data will be computed as described above,
except that (1) as required by the periods of the quotations, actual annual,
annualized or aggregate data, rather than average annual data, may be quoted
and (2) the maximum applicable sales charges will not be included with respect
to annual or annualized rates of return calculations. Aside from the impact on
the performance data calculations of including or excluding the maximum
applicable sales charges, actual annual or annualized total return data
generally will be lower than average annual total return data since the average
rates of return reflect compounding of return; aggregate total return data
generally will be higher than average annual total return data since the
aggregate rates of return reflect compounding over a longer period of time.
 
                                       37
<PAGE>
 
  Set forth below is the total return, yield and tax-equivalent yield
information for Class A, Class B, Class C and Class D shares of the Fund for
the periods indicated.
 
<TABLE>   
<CAPTION>
                       CLASS A SHARES              CLASS B SHARES              CLASS C SHARES              CLASS D SHARES
                 -------------------------- ---------------------------- -------------------------- ----------------------------
                               REDEEMABLE                   REDEEMABLE                 REDEEMABLE                   REDEEMABLE
                 EXPRESSED AS  VALUE OF A   EXPRESSED AS A  VALUE OF A   EXPRESSED AS  VALUE OF A   EXPRESSED AS A  VALUE OF A
                 A PERCENTAGE HYPOTHETICAL    PERCENTAGE   HYPOTHETICAL  A PERCENTAGE HYPOTHETICAL    PERCENTAGE   HYPOTHETICAL
                  BASED ON A     $1,000       BASED ON A      $1,000      BASED ON A     $1,000       BASED ON A      $1,000
                 HYPOTHETICAL  INVESTMENT    HYPOTHETICAL   INVESTMENT   HYPOTHETICAL  INVESTMENT    HYPOTHETICAL   INVESTMENT
                    $1,000    AT THE END OF     $1,000     AT THE END OF    $1,000    AT THE END OF     $1,000     AT THE END OF
     PERIOD       INVESTMENT   THE PERIOD     INVESTMENT    THE PERIOD    INVESTMENT   THE PERIOD     INVESTMENT    THE PERIOD
     ------      ------------ ------------- -------------- ------------- ------------ ------------- -------------- -------------
                                                                   AVERAGE ANNUAL TOTAL RETURN
                                                           (INCLUDING MAXIMUM APPLICABLE SALES CHARGE)
<S>              <C>          <C>           <C>            <C>           <C>          <C>           <C>            <C>           
One year ended
July 31, 1997...     5.62%      $1,056.20        5.46%       $1,054.60      8.25%       $1,082.50        5.41%       $1,054.10
Five year ended
July 31, 1997...     5.78%      $1,324.40        6.11%       $1,345.00        --              --          --               --
Inception
(February 28,
1992) to July
31, 1997........     7.09%      $1,449.50        7.35%       $1,468.90        --              --          --               --
Inception
(October 21,
1994) to July
31, 1997........      --              --          --               --       8.49%       $1,253.60        7.50%       $1,222.30

                                                                       ANNUAL TOTAL RETURN
                                                           (EXCLUDING MAXIMUM APPLICABLE SALES CHARGE)
Year ended July
31, 1997........    10.02%      $1,100.20        9.46%       $1,094.60      9.25%       $1,092.50        9.80%       $1,098.00
Year ended July
31, 1996........     6.78%      $1,067.80        6.23%       $1,062.30      6.12%       $1,061.20        6.67%       $1,066.70
Year ended July
31, 1995........     5.35%      $1,053.50        4.82%       $1,048.20        --        --                --         --
Inception
(October 21,
1994) to July
31, 1995........      --              --          --               --        8.13%      $1,081.30        8.70%       $1,087.00
Year ended July
31, 1994........     1.26%      $1,012.60        0.75%       $1,007.50        --        --                --         --
Year ended July
31, 1993........    10.08%      $1,100.80        9.53%       $1,095.30        --        --                --         --
Inception
(February 28,
1992) to July
31, 1992........     9.44%      $1,094.40        9.22%       $1,092.20        --              --          --               --

                                                                     AGGREGATE TOTAL RETURN
                                                           (INCLUDING MAXIMUM APPLICABLE SALES CHARGE)
Inception
(February 28,
1992) to July
31, 1997........    44.95%      $1,449.50       46.89%       $1,468.90        --              --          --               --
Inception
(October 21,
1994) to July
31, 1997........      --              --          --               --       25.36%      $1,253.60       22.23%       $1,222.30

                                                                              YIELD
30 days ended
July 31, 1997...     4.51%            --         4.20%             --        4.11%            --         4.42%             --

                                                                      TAX EQUIVALENT YIELD*

30 days ended
July 31, 1997...     6.26%            --         5.83%             --        5.71%            --         6.14%             --
</TABLE>    
 
- ----
* Based on a Federal income tax rate of 28%.
 
                                       38
<PAGE>
 
   
  In order to reflect the reduced sales charges in the case of Class A or Class
D shares or the waiver of the CDSC in the case of Class B or Class C shares
applicable to certain investors, as described under "Purchase of Shares" and
"Redemption of Shares," respectively, the total return data quoted by the Fund
in advertisements directed to such investors may take into account the reduced,
and not the maximum, sales charge or may take into account the CDSC and
therefore may reflect greater total return since, due to the reduced sales
charges or the waiver of sales charges, a lower amount of expenses is deducted.
    
                              GENERAL INFORMATION
 
DESCRIPTION OF SHARES
   
  The Declaration of Trust provides that the Trust shall be comprised of
separate Series each of which will consist of a separate portfolio which will
issue separate shares. The Trust is presently comprised of the Fund, Merrill
Lynch Arizona Municipal Bond Fund, Merrill Lynch Arkansas Municipal Bond Fund,
Merrill Lynch Colorado Municipal Bond Fund, Merrill Lynch Connecticut Municipal
Bond Fund, Merrill Lynch Florida Municipal Bond Fund, Merrill Lynch Maryland
Municipal Bond Fund, Merrill Lynch Michigan Municipal Bond Fund, Merrill Lynch
Minnesota Municipal Bond Fund, Merrill Lynch New Jersey Municipal Bond Fund,
Merrill Lynch New Mexico Municipal Bond Fund, Merrill Lynch New York Municipal
Bond Fund, Merrill Lynch North Carolina Municipal Bond Fund, Merrill Lynch Ohio
Municipal Bond Fund, Merrill Lynch Oregon Municipal Bond Fund, Merrill Lynch
Pennsylvania Municipal Bond Fund and Merrill Lynch Texas Municipal Bond Fund.
The Trustees are authorized to create an unlimited number of Series and, with
respect to each Series, to issue an unlimited number of full and fractional
shares of beneficial interest, par value $.10 per share, of different classes
and to divide or combine the shares into a greater or lesser number of shares
without thereby changing the proportionate beneficial interests in the Series.
Shareholder approval is not necessary for the authorization of additional
Series or classes of a Series of the Trust. At the date of this Statement of
Additional Information, the shares of the Fund are divided into Class A, Class
B, Class C and Class D shares. Class A, Class B, Class C and Class D shares
represent interests in the same assets of the Fund and are identical in all
respects except that Class B, Class C and Class D shares bear certain expenses
related to the account maintenance and/or distribution expenditures. The Board
of Trustees may classify and reclassify the shares of any Series into
additional or other classes at a future date.     
   
  All shares of the Trust have equal voting rights, except that only shares of
the respective Series are entitled to vote on matters concerning only that
Series and, as noted above, Class B, Class C and Class D shares have exclusive
voting rights with respect to matters relating to the account maintenance
and/or distribution expenses, as appropriate, being borne solely by such class.
Each issued and outstanding share of a Series is entitled to one vote and to
participate equally in dividends and distributions with respect to that Series
and, upon liquidation or dissolution of the Series, in the net assets of such
Series remaining after satisfaction of outstanding liabilities, except that, as
noted above, expenses relating to distribution and/or account maintenance of
the Class B, Class C and Class D shares are borne solely by the respective
class. There normally will be no meeting of shareholders for the purposes of
electing Trustees unless and until such time as less than a majority of the
Trustees holding office have been elected by shareholders, at which time the
Trustees then in office will call a shareholders' meeting for the election of
Trustees. Shareholders may, in accordance with the terms of the Declaration of
Trust, cause a meeting of shareholders to be held for the purpose of voting on
the removal of Trustees. Also, the Trust will be required to call a special
meeting of     
 
                                       39
<PAGE>
 
shareholders in accordance with the requirements of the 1940 Act to seek
approval of new management and advisory arrangements, of a material increase in
distribution fees or of a change in the fundamental policies, objectives or
restrictions of a Series.
   
  The obligations and liabilities of a particular Series are restricted to the
assets of that Series and do not extend to the assets of the Trust generally.
The shares of each Series, when issued, will be fully paid and nonassessable,
have no preference, preemptive, conversion, exchange or similar rights, and
will be freely transferable. Holders of shares of any Series are entitled to
redeem their shares as set forth elsewhere herein and in the Prospectus. Shares
do not have cumulative voting rights and the holders of more than 50% of the
shares of the Trust voting for the election of Trustees can elect all of the
Trustees if they choose to do so, and in such event the holders of the
remaining shares would not be able to elect any Trustees. No amendments may be
made to the Declaration of Trust, other than amendments necessary to conform
the Declaration to certain laws or regulations, to change the name of the
Trust, or to make certain non-material changes, without the affirmative vote of
a majority of the outstanding shares of the Trust or of the affected Series or
class, as applicable.     
   
  Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be held personally liable as partners for the trust's
obligations. However, the risk of a shareholder incurring financial loss on
account of shareholder liability is limited to circumstances in which both
inadequate insurance existed and the trust itself was unable to meet its
obligations     
   
  The Manager provided the initial capital for the Fund by purchasing 10,000
shares of the Fund for $100,000. Such shares were acquired for investment and
can only be disposed of by redemption. If additional Series are added to the
Trust, the organizational expenses will be allocated among the Series in a
manner deemed equitable by the Trustees.     
 
COMPUTATION OF OFFERING PRICE PER SHARE
 
  An illustration of the computation of the offering price for Class A, Class
B, Class C and Class D shares of the Fund based on the value of the Fund's net
assets and number of shares outstanding on July 31, 1996 is calculated as set
forth below.
 
 
<TABLE>   
<CAPTION>
                                   CLASS A     CLASS B    CLASS C    CLASS D
                                  ---------- ----------- ---------- ----------
<S>                               <C>        <C>         <C>        <C>
Net Assets....................... $5,757,323 $53,335,618 $1,494,984 $1,601,650
                                  ========== =========== ========== ==========
Number of Shares Outstanding.....    519,994   4,817,405    135,135    144,619
                                  ========== =========== ========== ==========
Net Asset Value Per Share (net
 assets divided by number of
 shares outstanding)............. $    11.07 $     11.07 $    11.06 $    11.07
Sales Charge (for Class A and
 Class D shares: 4.00% of
 offering price; 4.17% of net
 asset value per share)*.........        .46          **         **        .46
                                  ---------- ----------- ---------- ----------
Offering Price................... $    11.53 $     11.07 $    11.06 $    11.53
                                  ========== =========== ========== ==========
</TABLE>    
- --------
 * Rounded to the nearest one-hundredth percent; assumes maximum sales charge
   is applicable.
** Class B and Class C shares are not subject to an initial sales charge but
   may be subject to a CDSC on redemption of shares. See "Purchase of Shares--
   Deferred Sales Charge Alternatives--Class B and Class C Shares" in the
   Prospectus and "Redemption of Shares--Deferred Sales Charges--Class B and
   Class C Shares" herein.
 
                                       40
<PAGE>
 
INDEPENDENT AUDITORS
   
  Deloitte & Touche LLP, 117 Campus Drive, Princeton, New Jersey 08540-6400,
has been selected as the independent auditors of the Fund. The selection of
independent auditors is subject to approval by the independent Trustees of the
Trust. The independent auditors are responsible for auditing the annual
financial statements of the Fund.     
 
CUSTODIAN
 
  State Street Bank and Trust Company, P.O. Box 351, Boston, Massachusetts
02101, acts as the custodian of the Fund's assets. The custodian is responsible
for safeguarding and controlling the Fund's cash and securities, handling the
delivery of securities and collecting interest on the Fund's investments.
 
TRANSFER AGENT
 
  Merrill Lynch Financial Data Services, Inc., 4800 Deer Lake Drive East,
Jacksonville, Florida 32246-6484, acts as the Trust's transfer agent. The
Transfer Agent is responsible for the issuance, transfer and redemption of
shares and the opening, maintenance and servicing of shareholder accounts. See
"Management of the Trust--Transfer Agency Services" in the Prospectus.
 
LEGAL COUNSEL
 
  Brown & Wood LLP, One World Trade Center, New York, New York 10048-0557, is
counsel for the Trust.
 
REPORTS TO SHAREHOLDERS
 
  The fiscal year of the Fund ends on July 31 of each year. The Trust sends to
shareholders of the Fund at least semi-annually reports showing the Fund's
portfolio and other information. An annual report, containing financial
statements audited by independent auditors, is sent to shareholders each year.
After the end of each year shareholders will receive Federal income tax
information regarding dividends and capital gains distributions.
 
ADDITIONAL INFORMATION
 
  The Prospectus and this Statement of Additional Information do not contain
all the information set forth in the Registration Statement and the exhibits
relating thereto, which the Trust has filed with the Commission, Washington,
D.C., under the Securities Act and the 1940 Act, to which reference is hereby
made.
 
  The Declaration of Trust establishing the Trust dated August 2, 1985, a copy
of which, together with all amendments thereto (the "Declaration") is on file
in the office of the Secretary of the Commonwealth of Massachusetts, provides
that the name "Merrill Lynch Multi-State Municipal Series Trust" refers to the
Trustees under the Declaration collectively as Trustees, but not as individuals
or personally; and no Trustee, shareholder, officer, employee or agent of the
Trust shall be held to any personal liability; nor shall resort be had to any
such person's private property for the satisfaction of any obligation or claim
of the Trust but the "Trust Property" only shall be liable.
   
  To the knowledge of the Trust, no person or entity owned beneficially 5% or
more of the Fund's shares on October 1, 1997.     
 
                                       41
<PAGE>
 
                                   APPENDIX I
 
               ECONOMIC AND FINANCIAL CONDITIONS IN MASSACHUSETTS
   
  The following information is a brief summary of factors affecting the economy
of the Commonwealth of Massachusetts and does not purport to be a complete
description of such factors. Other factors will affect issuers. The summary is
based primarily upon one or more publicly available offering statements
relating to debt offerings of Massachusetts issuers; however, it has not been
updated nor will it be updated during the year. The Trust has not independently
verified the information.     
   
  While economic growth in the Commonwealth of Massachusetts (sometimes
referred to herein as the "Commonwealth") slowed considerably during the
recession of 1990-1991, indicators such as retail sales, housing permits,
construction, and employment levels suggest a strong and continued economic
recovery. As of September, 1997, the Commonwealth's unadjusted unemployment
rate was 4.0% as compared to a national average of 4.7%. Per capita personal
income in the Commonwealth is currently higher than the national average.     
          
  In fiscal 1995, the total revenues of the budgeted operating funds of the
Commonwealth increased by approximately 5.4% over the prior fiscal year, to
$16.387 billion. Expenditures increased by 4.7% over the prior fiscal year, to
$16.251 billion. As a result, the Commonwealth ended fiscal 1995 with a
positive closing fund balance of $726.0 million.     
   
  In fiscal 1996, the total revenues of the budgeted operating funds of the
Commonwealth increased by approximately 5.7% over the prior fiscal year to
$17.328 billion. Expenditures increased by 3.9% over the prior fiscal year to
$16.881 billion. As a result, the Commonwealth ended fiscal year 1996 with a
positive closing fund balance of $1.172 billion.     
   
  Budgeted revenues and other sources in fiscal 1997, which ended June 30,
1997, were estimated as of August 6, 1997 by the Executive Office for
Administration and Finance to be approximately $17.917 billion, including tax
revenues of $12.861 billion. It is estimated that fiscal 1997 budgeted
expenditures will be $17.735 billion, including $212.8 million in supplemental
appropriations requested by then-Governor Weld but not yet enacted by the
Legislature, and that fiscal 1997 will end with fund balances of approximately
$1.194 billion.     
   
  On July 10, 1997, then-Governor William Weld signed a new $18.4 billion
budget into law. The Commonwealth's eighth consecutive balanced budget
represents an overall spending increase of 3.8% over fiscal year 1997.     
   
  Standard & Poor's Ratings Group and Moody's Investors Service, Inc. have
rated the Commonwealth's general obligation bonds as A+ and A-1, respectively.
Fitch Investors Service, Inc. has recently rated the Commonwealth's bonds as
A+. From time to time, agencies may change their ratings.     
   
  Growth of tax revenues in the Commonwealth is limited by law. Tax revenues in
fiscal years 1992 through 1996 were lower than the limits set by law, and the
Executive Office for Administration and Finance estimates that state tax
revenues in fiscal 1997 will not reach the limits imposed by law. In addition,
effective July 1, 1990, limitations were placed on the amount of direct bonds
the Commonwealth may have outstanding     
 
                                       42
<PAGE>
 
in a fiscal year, and the amount of the total appropriation in any fiscal year
that may be expended for repayment of principal of and payment of interest on
general obligation debt of the Commonwealth was limited to 10% of such
appropriation. Bonds in the aggregate principal amount of $1.416 billion issued
in October and December 1990, under Chapter 151 of the Acts of 1990 to meet the
fiscal 1990 deficit, are excluded from the computation of these limitations,
and principal of and interest on such bonds are to be paid from up to 15% of
the Commonwealth's income tax receipts in each year that such principal or
interest is payable.
   
  Certain of the Commonwealth's cities and towns have at times experienced
serious financial difficulties which have adversely affected their credit
standing. The recurrence of such financial difficulties, or financial
difficulties of the Commonwealth, could adversely affect the market values and
marketability of outstanding obligations issued by the Commonwealth or its
public authorities or municipalities.     
   
  On July 11, 1997, then-Governor Weld signed legislation that immediately
abolished the Middlesex County government. The legislation also eliminates
Worcester and Hampden County governments on July 1, 1998 (or sooner if such
county defaults on a bond or note) and sets the stage for the abolition of the
entire county system by 1999. In general, all liabilities, debts, leases and
contracts of an abolished county which are in force immediately before the
transfer date would become obligations of the Commonwealth.     
   
  On July 29, 1997, Governor Weld submitted his formal resignation as Governor.
Under the Commonwealth's constitution, Lieutenant Governor Cellucci will serve
as Acting Governor until the current gubernatorial term expires in January,
1999.     
   
  In Massachusetts, the tax on personal property and real estate is virtually
the only source of tax revenues available to cities and towns to meet local
costs. "Proposition 2 1/2," an initiative petition adopted by the voters of the
Commonwealth on November 4, 1980, limits the power of Massachusetts cities and
towns and certain tax-supported districts and public agencies to raise revenue
from property taxes to support their operations, including the payment of
certain debt service. Proposition 2 1/2 required many cities and towns to
reduce their property tax levels to a stated percentage of the full and fair
cash value of their taxable real estate and personal property and limited the
amount by which the total property taxes assessed by a city or town might
increase from year to year. Although the limitations of Proposition 2 1/2 on
tax increases may be overridden and amounts for debt service and capital
expenditures excluded from such limitation by the voters of the relevant
municipality, Proposition 2 1/2 will continue to restrain significantly the
ability of cities and towns to pay for local services.     
   
  To offset shortfalls experienced by local governments as a result of the
implementation of Proposition 2 1/2, the government of the Commonwealth
increased direct local aid from the 1981 level of $1.632 billion to $2.976
billion in fiscal 1995. Fiscal 1996 expenditures for direct local aid were
$3.246 billion, which is an increase of approximately 9.1% above the 1995
level. It is estimated that fiscal 1997 expenditures for direct local aid will
be $3.538 billion, which is an increase of approximately 9.0% above the fiscal
1996 level.     
   
  The aggregate unfunded actuarial liabilities of the pension systems of the
Commonwealth and the unfunded liability of the Commonwealth related to local
retirement systems are significant--estimated to be approximately $6.720
billion as of January 1, 1996 on the basis of certain actuarial assumptions
regarding, among other things, future investment earnings, annual inflation
rates, wage increases and cost of living     
 
                                       43
<PAGE>
 
   
increases. No assurance can be given that these assumptions will be realized.
The legislature adopted a comprehensive pension bill addressing the issue in
January 1988, which requires the Commonwealth, beginning in fiscal year 1989,
to fund future pension liabilities currently and amortize the Commonwealth's
unfunded liabilities over 40 years in accordance with funding schedules
prepared by the Secretary for Administration and Finance and approved by the
legislature. The amounts required for funding of current pension liabilities in
fiscal years 1997, 1998, 1999 and 2000 are estimated to be $965.9 million,
$1.005 billion, $1.043 billion and $1.092 billion, respectively. The fiscal
1998 budget approved by then-Governor Weld includes an accelerated pension
funding schedule designed to eliminate the Commonwealth's unfunded liability by
2018 rather than 2028.     
 
                                       44
<PAGE>
 
                                  APPENDIX II
 
                           RATINGS OF MUNICIPAL BONDS
 
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
     payment 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.
 
  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.
 
                                       45
<PAGE>
 
  Short-term Notes: The four ratings of Moody's for short-term notes are
MIG1/VMIG1, MIG2/ VMIG2, MIG3/VMIG3 and MIG4/VMIG4; MIG1/VMIG1 denotes "best
quality . . . strong protection by established cash flows"; MIG2/VMIG2 denotes
"high quality" with ample margins of protection; MIG3/VMIG3 notes are of
"favorable quality . . . but . . . lacking the undeniable strength of the
preceding grades"; MIG4/VMIG4 notes are of "adequate quality . . . [p]rotection
commonly regarded as required of an investment security is present . . . there
is specific risk."
       
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 ability 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 the following characteristics: leading market
positions in well established industries; high rates of return on funds
employed; conservative capitalization structure 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 effect of industry
characteristics and market composition may be more pronounced. Variability in
earnings and profitability may result in changes in the level of debt
protection measurements and 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 RATINGS SERVICES ("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.
It takes into consideration the creditworthiness of guarantors, insurers, or
other forms of credit enhancement on the obligation.     
   
  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 it 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 other circumstances.     
 
                                       46
<PAGE>
 
  The ratings are based, in varying degrees, on the following considerations:
     
    I. Likelihood of payment--capacity and willingness of the obligor to meet
  its financial commitment on an obligation in accordance with the terms of
  the obligation;     
     
    II. Nature of and provisions of the obligation; and     
 
    III. Protection afforded by, and relative position of, the obligation in
  the event of bankruptcy, reorganization or other arrangement under the laws
  of bankruptcy and other laws affecting creditors' rights.
 
        
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 obligations 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
CCC  degree of speculation and "C" the highest degree of speculation. While
CC   such debt will likely have some quality and protective
C    characteristics, these may be outweighed by large uncertainties or
     major 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 a similar action if payments on an obligation are
     jeopardized.     
 
  Plus (+) or Minus (-): The ratings from "AA" to "CCC" may be modified by the
addition of a plus or minus sign to show relative standing within the major
rating categories.
       
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" for
the highest-quality obligations to "D" for the lowest. These categoris 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.
         
                                       47
<PAGE>
 
  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 and 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.     
   
DESCRIPTION OF STANDARD & POOR'S SHORT-TERM ISSUE CREDIT RATINGS     
   
  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.     
SP-3   
    Speculative capacity to pay principal and interest.     
           
DESCRIPTION OF FITCH INVESTORS SERVICE, 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 ratings
represent 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 of any
 
                                       48
<PAGE>
 
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 guaranties 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 any 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.     
 
  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.
       
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.
 
                                       49
<PAGE>
 
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.
   
Ratings
Outlook:    
            An outlook is used to describe the most likely direction of any
            rating change over the intermediate term. It is described as a
            "Positive" or "Negative." The absence of a designation indicates a
            stable outlook.     
 
DESCRIPTION OF FITCH 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 same 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.
 
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.
 
                                       50
<PAGE>
 
                Bonds are in default on interest and/or principal payments.
DDD             Such bonds are extremely speculative and should be valued on
                the basis of their ultimate recovery value in liquidation or
DD              reorganization of the obligor. "DDD" represents the highest
                potential for recovery on these bonds, and "D" represents the
D               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 INVESTMENT GRADE SHORT-TERM RATINGS
 
  Fitch's short-term ratings apply to debt obligations that are payable on
demand or have original maturities of generally 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.
       
                                       51
<PAGE>
 
INDEPENDENT AUDITORS' REPORT
 
The Board of Trustees and Shareholders,
Merrill Lynch Massachusetts Municipal Bond Fund of Merrill Lynch Multi-State
Municipal Series Trust:
   
We have audited the accompanying statement of assets and liabilities, including
the schedule of investments, of Merrill Lynch Massachusetts Municipal Bond Fund
of Merrill Lynch Multi-State Municipal Series Trust as of July 31, 1997, the
related statements of operations for the year then ended and changes in net
assets for each of the years in the two-year period then ended, and the
financial highlights for each of the years in the five-year period then
ended.These financial statements and the financial highlights are the
responsibility of the Fund's management. Our responsibility is to express an
opinion on these financial statements and the financial highlights based on our
audits.     
   
We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and the financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities owned at July
31, 1997 by correspondence with the custodian. An audit also includes assessing
the accounting principles used and significant estimates made by management, as
well as evaluating the overall financial statement presentation. We believe
that our audits provide a reasonable basis for our opinion.     
   
In our opinion, such financial statements and financial highlights present
fairly, in all material respects, the financial position of Merrill Lynch
Massachusetts Municipal Bond Fund of Merrill Lynch Multi-State Municipal Series
Trust as of July 31, 1997, the results of its operations, the changes in its
net assets, and the financial highlights for the respective stated periods in
conformity with generally accepted accounting principles.     
 
Deloitte & Touche LLP
Princeton, New Jersey
   
September 5, 1997     
 
                                       52
<PAGE>
 
<TABLE>
<CAPTION>

Merrill Lynch Massachusetts Municipal Bond Fund                                                                 July 31, 1997

SCHEDULE OF INVESTMENTS                                                                                         (in Thousands)

S&P         Moody's     Face                                                                                         Value
Ratings     Ratings    Amount                                   Issue                                              (Note 1a)

<S>        <C>         <C>     <C>                                                                                <C>

Massachusetts -- 99.1%
BBB         Baa1        $865    Boston, Massachusetts, Industrial Development Financing Authority,
                                Sewer Facility Revenue Bonds (Harbor Electric Energy Company Project), AMT,
                                7.375% due 5/15/2015                                                                  $945
                                Massachusetts Bay Transportation Authority Revenue Bonds (Massachusetts
                                General Transportation Systems), Series A:
A+          A1         1,000    7% due 3/01/2021                                                                     1,245
A+          A1         1,750    Refunding, 7% due 3/01/2011                                                          2,113
AAA         Aaa          980    Massachusetts Education Loan Authority, Educational Loan Revenue Bonds, AMT,
                                Issue E, Series A, 7.375% due 1/01/2012 (b)                                          1,071
AAA         Aaa        1,880    Massachusetts Educational Financing Authority, Educational Loan Revenue
                                Refunding Bonds, AMT, Issue E, 5.85% due 7/01/2014 (b)                               1,957
                                Massachusetts State Health and Educational Facilities Authority Revenue Bonds:
AAA         Aaa        2,780    (Boston College), Series J, 6.625% due 7/01/2021 (e)                                 3,053
A+          A1         2,520    (Brigham and Women's Hospital), Series C, 6.75% due 6/01/2021                        2,669
A1+         VMIG1+     1,500    (Capital Asset Program), VRDN, Series B, 3.45% due 7/01/2005 (a)(d)                  1,500
AAA         Aaa        5,150    (Central Massachusetts Medical Center), CARS, Series B, 8.87% due 6/23/2022
                                (b)(f)                                                                               6,412
AAA         Aaa        2,500    (Newton Wellesley Hospital), Series D, 7% due 7/01/2001 (d)(g)                       2,800
AAA         Aaa        1,000    (Northeastern University), Series E, 6.55% due 10/01/2022 (d)                        1,110
NR*         B2         1,000    Refunding (New England Memorial Hospital), Series B, 6.125% due 7/01/2013              869
AAA         Aaa        1,000    Refunding (Stonehill College), Series E, 6.60% due 7/01/2020 (d)                     1,108
NR*         A          2,335    Refunding (Wheaton College), Series C, 5.25% due 7/01/2019                           2,323
                                Massachusetts State, HFA, Revenue Bonds (Residential Development) (c):
AAA         Aaa        2,000    Series C, 6.875% due 11/15/2011                                                      2,158
AAA         Aaa        2,500    Series C, 6.90% due 11/15/2021                                                       2,700
AAA         Aaa        1,000    Series D, Section 8, 6.875% due 11/15/2021                                           1,075
                                Massachusetts State, HFA, S/F Housing Revenue Bonds, AMT:
A+          Aa         1,500    Series 38, 7.20% due 12/01/2026                                                      1,622
A+          Aa         2,000    Series 40, 6.65% due 12/01/2027                                                      2,123
AAA         Aaa        1,915    Series 48, 6.35% due 6/01/2026 (d)                                                   2,011
                                Massachusetts State Industrial Finance Agency Revenue Bonds:
AAA         Aaa        1,000    (Babson College), Series A, 6.50% due 10/01/2022 (d)                                 1,104
NR*         A3         2,000    (Babson College), Series A, 5.25% due 10/01/2027                                     1,970
A+          A1         1,795    Refunding (Holy Cross College-II), 6.375% due 11/01/2002 (g)                         2,001
A1+         VMIG1+     1,700    Massachusetts State Municipal Wholesale Electric Company, Power Supply System,
                                Revenue Refunding Bonds, VRDN, Series C, 3.50% due 7/01/2019 (a)                     1,700

</TABLE> 

                                      53
<PAGE>
 
<TABLE> 

<S>         <C>        <C>      <C>                                                                                  <C> 
AA+         Aa3        1,680    Massachusetts State Water Pollution Abatement Trust Revenue Bonds (Secured
                                Loan Program), Series A, 6.375% due 2/01/2015                                        1,836
A           A          6,000    Massachusetts State Water Resource Authority, Series A, 6.50% due 7/15/2019          7,023
NR*         Aaa        1,000    Nantucket, Massachusetts, GO, 5.50% due 7/15/2006 (d)                                1,070
AAA         Aaa        1,000    South Essex, Massachusetts, Sewer District, GO, Refunding, Series A, 5.25% due
                                6/15/2024 (d)                                                                          990
AAA         Aaa        1,210    Southern Berkshire, Massachusetts, Regional School District, GO, UT, 7% due
                                4/15/2003 (d)(g)                                                                     1,374
NR*         Baa        1,500    Springfield, Massachusetts, School Project Loan, GO, Series B, 7.10% due
                                9/01/2002 (g)                                                                        1,718

Total Investments (Cost -- $56,583) -- 99.1%                                                                        61,650

Other Assets Less Liabilities -- 0.9%                                                                                  540
                                                                                                                   -------
Net Assets -- 100.0%                                                                                               $62,190
                                                                                                                   =======
(a) The interest rate is subject to change periodically based upon prevailing market rates.
    The interest rate shown is the rate in effect at July 31, 1997.
(b) AMBAC Insured.
(c) FNMA Collateralized.
(d) MBIA Insured.
(e) FGIC Insured.
(f) The interest rate is subject to change periodically and inversely based upon prevailing market rates.
    The interest rate shown is the rate in effect at July 31, 1997.
(g) Prerefunded.
*   Not Rated.
+   Highest short-term rating by Moody's Investors Service, Inc.
    Ratings of issues shown have not been audited by Deloitte & Touche LLP.

PORTFOLIO ABBREVIATIONS
- --------------------------------------------------------------------------------

To simplify the listings of Merrill Lynch Massachusetts Municipal Bond Fund's 
portfolio holdings in the Schedule of Investments, we have abbreviated the names
of many of the securities according to the list at right.

AMT     Alternative Minimum Tax (subject to)
CARS    Complementary Auction Rate Securities
GO      General Obligation Bonds
HFA     Housing Finance Agency
S/F     Single-Family
UT      Unlimited Tax
VRDN    Variable Rate Demand Notes

    See Notes to Financial Statements.
</TABLE>

                                      54
<PAGE>
 
<TABLE>
<CAPTION>

FINANCIAL INFORMATION

Statement of Assets and Liabilities as of July 31, 1997
<S>                  <C>                                                                     <C>               <C>

Assets:               Investments, at value (identified cost -- $56,582,944) (Note 1a)                          $61,650,273
                      Cash                                                                                          160,103
                      Receivables:
                      Interest                                                                $605,865
                      Beneficial interest sold                                                  64,932              670,797
                                                                                             ---------
                      Prepaid registration fees and other assets (Note 1e)                                            7,161
                                                                                                                -----------
                      Total assets                                                                               62,488,334
                                                                                                                -----------

Liabilities:          Payables:
                      Beneficial interest redeemed                                             128,997
                      Dividends to shareholders (Note 1f)                                       77,378
                      Investment adviser (Note 2)                                               28,804
                      Distributor (Note 2)                                                      23,423              258,602
                                                                                             ---------
                      Accrued expenses and other liabilities                                                         40,157
                                                                                                                -----------
                      Total liabilities                                                                             298,759
                                                                                                                -----------

Net Assets:           Net assets                                                                                $62,189,575
                                                                                                                ===========

Net Assets            Class A Shares of beneficial interest, $.10 par value, unlimited number of
Consist of:           shares authorized                                                                             $51,999
                      Class B Shares of beneficial interest, $.10 par value, unlimited number of
                      shares authorized                                                                             481,741
                      Class C Shares of beneficial interest, $.10 par value, unlimited number of
                      shares authorized                                                                              13,514
                      Class D Shares of beneficial interest, $.10 par value, unlimited number of
                      shares authorized                                                                              14,462
                      Paid-in capital in excess of par                                                           58,133,761
                      Accumulated realized capital losses on investments -- net (Note 5)                         (1,573,231)
                      Unrealized appreciation on investments -- net                                               5,067,329
                                                                                                                -----------
                      Net assets                                                                                $62,189,575
                                                                                                                ===========

Net Asset Value:      Class A -- Based on net assets of $5,757,323 and 519,994 shares of
                      beneficial interest outstanding                                                                $11.07
                                                                                                                ===========
                      Class B -- Based on net assets of $53,335,618 and 4,817,405 shares of
                      beneficial interest outstanding                                                                $11.07
                                                                                                                ===========
                      Class C -- Based on net assets of $1,494,984  and 135,135 shares of
                      beneficial interest outstanding                                                                $11.06
                                                                                                                ===========
                      Class D -- Based on net assets of $1,601,650 and 144,619 shares of
                      beneficial interest outstanding                                                                $11.07
                                                                                                                ===========

                      See Notes to Financial Statements.

</TABLE>

                                      55
<PAGE>
 
<TABLE>
<CAPTION>

Statement of Operations

                                                                                                         For the Year Ended
                                                                                                              July 31, 1997
<S>                   <C>                                                                <C>                    <C>
Investment Income      Interest and amortization of premium and discount earned                                  $3,910,891
(Note 1d):

Expenses:              Investment advisory fees (Note 2)                                  $355,290
                       Account maintenance and distribution fees -- Class B (Note 2)       280,454
                       Professional fees                                                    58,231
                       Accounting services (Note 2)                                         40,593
                       Transfer agent fees -- Class B (Note 2)                              29,824
                       Printing and shareholder reports                                     19,855
                       Registration fees (Note 1e)                                          17,200
                       Account maintenance and distribution fees -- Class C (Note 2)         9,407
                       Amortization of organization expenses (Note 1e)                       5,938
                       Custodian fees                                                        3,841
                       Pricing fees                                                          3,783
                       Trustees' fees and expenses                                           3,290
                       Transfer agent fees --  Class A (Note 2)                              2,414
                       Account maintenance fees -- Class D (Note 2)                          1,356
                       Transfer agent fees -- Class C (Note 2)                                 813
                       Transfer agent fees -- Class D (Note 2)                                 582
                                                                                       -----------
                       Total expenses                                                                               832,871
                                                                                                                -----------
                       Investment income -- net                                                                   3,078,020
                                                                                                                -----------

Realized &             Realized gain on investments -- net                                                          121,207
Unrealized Gain on     Change in unrealized appreciation on investments -- net                                    2,599,000
Investments -- Net                                                                                              -----------
(Notes 1b, 1d & 3):    Net Increase in Net Assets Resulting from Operations                                      $5,798,227
                                                                                                                ===========

                       See Notes to Financial Statements.

</TABLE>

                                      56
<PAGE>
 
<TABLE>
<CAPTION>

Statements of Changes in Net Assets

                                                                                                 For the Year Ended July 31,
Increase (Decrease) in Net Assets:                                                                 1997              1996
<S>                   <C>                                                                       <C>             <C>
Operations:            Investment income -- net                                                  $3,078,020      $3,534,570
                       Realized gain (loss) on investments -- net                                   121,207        (120,826)
                       Change in unrealized appreciation on investments -- net                    2,599,000       1,137,298
                                                                                                -----------     -----------
                       Net increase in net assets resulting from operations                       5,798,227       4,551,042
                                                                                                -----------     -----------

Dividends to           Investment income -- net:
Shareholders           Class A                                                                     (291,690)       (338,974)
(Note 1f):             Class B                                                                   (2,644,286)     (3,107,959)
                       Class C                                                                      (72,540)        (36,158)
                       Class D                                                                      (69,504)        (51,479)
                                                                                                -----------     -----------
                       Net decrease in net assets resulting from dividends to shareholders       (3,078,020)     (3,534,570)
                                                                                                -----------     -----------

Beneficial Interest    Net decrease in net assets derived from beneficial
Transactions           interest transactions                                                     (8,761,111)     (7,525,610)
(Note 4):                                                                                       -----------     -----------

Net Assets:            Total decrease in net assets                                              (6,040,904)     (6,509,138)
                       Beginning of year                                                         68,230,479      74,739,617
                                                                                                -----------     -----------
                       End of year                                                              $62,189,575     $68,230,479
                                                                                                ===========     ===========

                       See Notes to Financial Statements.

</TABLE>

                                      57
<PAGE>
 
<TABLE>
<CAPTION>

Financial Highlights

The following per share data and ratios have been derived                                 Class A
from information provided in the financial statements.

                                                                                For the Year Ended July 31,
                                                                     1997       1996       1995       1994       1993
Increase (Decrease) in Net Asset Value:
<S>                 <C>                                           <C>        <C>        <C>        <C>        <C>
Per Share            Net asset value, beginning of year            $10.60     $10.46     $10.48     $11.07     $10.68
Operating                                                       ---------  ---------  ---------  ---------  ---------
Performance:         Investment income -- net                         .56        .56        .56        .58        .63
                     Realized and unrealized gain (loss) on
                     investments -- net                               .47        .14       (.02)      (.43)       .42
                                                                ---------  ---------  ---------  ---------  ---------
                     Total from investment operations                1.03        .70        .54        .15       1.05
                                                                ---------  ---------  ---------  ---------  ---------
                     Less dividends and distributions:
                     Investment income -- net                        (.56)      (.56)      (.56)      (.58)      (.63)
                     Realized gain on investments -- net               --         --         --       (.15)      (.03)
                     In excess of realized gain on
                     investments -- net                                --         --         --       (.01)        --
                                                                ---------  ---------  ---------  ---------  ---------
                     Total dividends and distributions               (.56)      (.56)      (.56)      (.74)      (.66)
                                                                ---------  ---------  ---------  ---------  ---------
                     Net asset value, end of year                  $11.07     $10.60     $10.46     $10.48     $11.07
                                                                =========  =========  =========  =========  =========

Total Investment     Based on net asset value per share             10.02%      6.78%      5.35%      1.26%     10.08%
Return:*                                                        =========  =========  =========  =========  =========

Ratios to Average    Expenses, net of reimbursement                   .83%       .84%       .88%       .62%       .42%
Net Assets:                                                     =========  =========  =========  =========  =========
                     Expenses                                         .83%       .84%       .91%       .85%       .95%
                                                                =========  =========  =========  =========  =========
                     Investment income -- net                        5.22%      5.23%      5.42%      5.33%      5.75%
                                                                =========  =========  =========  =========  =========

Supplemental         Net assets, end of year (in thousands)        $5,757     $5,887     $6,630     $8,367     $7,093
Data:                                                           =========  =========  =========  =========  =========
                     Portfolio turnover                             24.64%     56.05%     89.62%     72.13%     39.37%
                                                                =========  =========  =========  =========  =========

                   * Total investment returns exclude the effects of sales loads.

                     See Notes to Financial Statements.

</TABLE> 

                                      58
<PAGE>
 
<TABLE> 
<CAPTION>

The following per share data and ratios have been derived                                 Class B
from information provided in the financial statements.

                                                                                For the Year Ended July 31,
                                                                     1997       1996       1995       1994       1993
Increase (Decrease) in Net Asset Value:
<S>                 <C>                                           <C>        <C>        <C>        <C>        <C>
Per Share            Net asset value, beginning of year            $10.60     $10.46     $10.48     $11.07     $10.68
Operating                                                       ---------  ---------  ---------  ---------  ---------
Performance:         Investment income -- net                         .51        .51        .50        .53        .57
                     Realized and unrealized gain (loss) on
                     investments -- net                               .47        .14       (.02)      (.43)       .42
                                                                ---------  ---------  ---------  ---------  ---------
                     Total from investment operations                 .98        .65        .48        .10        .99
                                                                ---------  ---------  ---------  ---------  ---------
                     Less dividends and distributions:
                     Investment income -- net                        (.51)      (.51)      (.50)      (.53)      (.57)
                     Realized gain on investments -- net               --         --         --       (.15)      (.03)
                     In excess of realized gain on
                     investments -- net                                --         --         --       (.01)        --
                                                                ---------  ---------  ---------  ---------  ---------
                     Total dividends and distributions               (.51)      (.51)      (.50)      (.69)      (.60)
                                                                ---------  ---------  ---------  ---------  ---------
                     Net asset value, end of year                  $11.07     $10.60     $10.46     $10.48     $11.07
                                                                =========  =========  =========  =========  =========

Total Investment     Based on net asset value per share              9.46%      6.23%      4.82%       .75%      9.53%
Return:*                                                        =========  =========  =========  =========  =========

Ratios to Average    Expenses, net of reimbursement                  1.34%      1.35%      1.39%      1.12%       .93%
Net Assets:                                                     =========  =========  =========  =========  =========
                     Expenses                                        1.34%      1.35%      1.42%      1.36%      1.45%
                                                                =========  =========  =========  =========  =========
                     Investment income -- net                        4.71%      4.72%      4.91%      4.83%      5.24%
                                                                =========  =========  =========  =========  =========

Supplemental         Net assets, end of year (in thousands)       $53,336    $59,868    $66,927    $76,436    $71,429
Data:                                                           =========  =========  =========  =========  =========
                     Portfolio turnover                             24.64%     56.05%     89.62%     72.13%     39.37%
                                                                =========  =========  =========  =========  =========

                   * Total investment returns exclude the effects of sales loads.

                     See Notes to Financial Statements.

</TABLE> 

                                      59
<PAGE>
 
<TABLE> 
<CAPTION>

                                                                      Class C                         Class D
                                                                                For the                             For the
                                                              For the           Period           For the            Period
The following per share data and ratios have been derived       Year            Oct. 21,           Year             Oct. 21,
from information provided in the financial statements.         Ended           1994+ to           Ended            1994+ to
                                                              July 31,          July 31,         July 31,           July 31,
Increase (Decrease) in Net Asset Value:                  1997        1996        1995        1997        1996        1995
<S>                 <C>                               <C>         <C>         <C>         <C>          <C>          <C>

Per Share            Net asset value, beginning of
Operating            period                            $10.60      $10.46      $10.03      $10.61       $10.47       $10.03
Performance:                                         --------    --------    --------    --------     --------     --------
                     Investment income -- net             .49         .49         .37         .55          .55          .42
                     Realized and unrealized gain on
                     investments -- net                   .46         .14         .43         .46          .14          .44
                                                     --------    --------    --------    --------     --------     --------
                     Total from investment
                     operations                           .95         .63         .80        1.01          .69          .86
                                                     --------    --------    --------    --------     --------     --------
                     Less dividends from investment
                     income -- net                       (.49)       (.49)       (.37)       (.55)        (.55)        (.42)
                                                     --------    --------    --------    --------     --------     --------
                     Net asset value, end of period    $11.06      $10.60      $10.46      $11.07       $10.61       $10.47
                                                    =========   =========   =========   =========    =========    =========
Total Investment     Based on net asset value per
Return:**            share                               9.25%       6.12%       8.13%++     9.80%        6.67%        8.70%++
                                                    =========   =========   =========   =========    =========    =========

Ratios to Average    Expenses                            1.43%       1.45%       1.56%*       .93%         .94%        1.04%*
Net Assets:                                         =========   =========   =========   =========    =========    =========
                     Investment income -- net            4.63%       4.61%       4.68%*      5.13%        5.12%        5.22%*
                                                    =========   =========   =========   =========    =========    =========
Supplemental         Net assets, end of period
Data:                (in thousands)                    $1,495      $1,185        $432      $1,602       $1,290         $750
                                                    =========   =========   =========   =========    =========    =========
                     Portfolio turnover                 24.64%      56.05%      89.62%      24.64%       56.05%       89.62%
                                                    =========   =========   =========   =========    =========    =========
                  *  Annualized.
                  ** Total investment returns exclude the effects of sales loads.
                  +  Commencement of Operations.
                  ++ Aggregate total investment return.

                     See Notes to Financial Statements.

</TABLE>

                                      60
<PAGE>
 
Merrill Lynch Massachusetts Municipal Bond Fund            July 31, 1997

NOTES TO FINANCIAL STATEMENTS

1. Significant Accounting Policies:
Merrill Lynch Massachusetts Municipal Bond Fund (the "Fund") is part of
Merrill Lynch Multi-State Municipal Series Trust (the "Trust"). The Fund
is registered under the Investment Company Act of 1940 as a non-
diversified, open-end management investment company.  The Fund offers
four classes of shares under the Merrill Lynch Select Pricing SM System.
Shares of Class A and Class D are sold with a front-end sales charge.
Shares of Class B and Class C may be subject to a contingent deferred
sales charge. All classes of shares have identical voting, dividend,
liquidation and other rights and the same terms and conditions, except
that Class B, Class C and Class D Shares bear certain expenses related
to the account maintenance of such shares, and Class B and Class C
Shares also bear certain expenses related to the distribution of such
shares. Each class has exclusive voting rights with respect to matters
relating to its account maintenance and distribution expenditures. The
following is a summary of significant accounting policies followed by
the Fund.

(a) Valuation of investments -- Municipal bonds and other portfolio
securities in which the Fund invests are traded primarily in the over-
the-counter municipal bond and money markets and are valued at the last
available bid price in the over-the-counter market or on the basis of
yield equivalents as obtained from one or more dealers that make markets
in the securities. Financial futures contracts and options thereon,
which are traded on exchanges, are valued at their settlement prices as
of the close of such exchanges. Short-term investments with remaining
maturities of sixty days or less are valued at amortized cost, which
approximates market value. Securities and assets for which market
quotations are not readily available are valued at fair value as
determined in good faith by or under the direction of the Board of
Trustees of the Trust, including valuations furnished by a pricing
service retained by the Trust, which may utilize a matrix system for
valuations. The procedures of the pricing service and its valuations are
reviewed by the officers of the Trust under the general supervision of
the Trustees.

(b) Derivative financial instruments -- The Fund may engage in various
portfolio strategies to seek to increase its return by hedging its
portfolio against adverse movements in the debt markets. Losses may
arise due to changes in the value of the contract or if the counterparty
does not perform under the contract.

[bullet] Financial futures contracts -- The Fund may purchase or sell
interest rate futures contracts and options on such futures contracts
for the purpose of hedging the market risk on existing securities or the
intended purchase of securities. Futures contracts are contracts for
delayed delivery of securities at a specific future date and at a
specific price or yield. Upon entering into a contract, the Fund
deposits and maintains as collateral such initial margin as required by
the exchange on which the transaction is effected. Pursuant to the
contract, the Fund agrees to receive from or pay to the broker an amount
of cash equal to the daily fluctuation in value of the contract. Such
receipts or payments are known as variation margin and are recorded by
the Fund as unrealized gains or losses. When the contract is closed, the
Fund records a realized gain or loss equal to the difference between the
value of the contract at the time it was opened and the value at the
time it was closed.

(c) Income taxes -- It is the Fund's policy to comply with the
requirements of the Internal Revenue Code applicable to regulated
investment companies and to distribute substantially all of its taxable
income to its shareholders. Therefore, no Federal income tax provision
is required.

(d) Security transactions and investment income -- Security transactions
are recorded on the dates the transactions are entered into (the trade
dates). Interest income is recognized on the accrual basis. Discounts
and market premiums are amortized into interest income. Realized gains
and losses on security transactions are determined on the identified
cost basis.

(e) Deferred organization expenses and prepaid registration fees --
Deferred organization expenses are charged to expense on a straight-line
basis over a five-year period. Prepaid registration fees are charged to
expense as the related shares are issued.

(f) Dividends and distributions -- Dividends from net investment income
are declared daily and paid monthly. Distributions of capital gains are
recorded on the ex-dividend dates.

                                      61
<PAGE>
 
2. Investment Advisory Agreement and Transactions with Affiliates:
The Fund has entered into an Investment Advisory Agreement with Fund
Asset Management, L.P. ("FAM"). The general partner of FAM is Princeton
Services, Inc. ("PSI"), an indirect wholly-owned subsidiary of Merrill
Lynch & Co., Inc. ("ML & Co."), which is the limited partner. The Fund
has also entered into a Distribution Agreement and Distribution Plans
with Merill Lynch Funds Distributor, Inc. ("MLFD" or "Distributor"), a
wholly-owned subsidiary of Merrill Lynch Group, Inc.

FAM is responsible for the management of the Fund's portfolio and
provides the necessary personnel, facilities, equipment and certain
other services necessary to the operations of the Fund. For such
services, the Fund pays a monthly fee based upon the average daily value
of the Fund's net assets at the following annual rates: 0.55% of the
Fund's average daily net assets not exceeding $500 million; 0.525% of
average daily net assets in excess of $500 million but not exceeding
$1 billion; and 0.50% of average daily net assets in excess of $1
billion.

Pursuant to the distribution plans (the "Distribution Plans") adopted by
the Fund in accordance with Rule 12b-1 under the Investment Company Act
of 1940, the Fund pays the Distributor ongoing account maintenance and
distribution fees. The fees are accrued daily and paid monthly at annual
rates based upon the average daily net assets of the shares as follows:

                 Account
               Maintenance                    Distribution
                  Fee                             Fee

Class B          0.25%                           0.25%
Class C          0.25%                           0.35%
Class D          0.10%                             --

Pursuant to a sub-agreement with the Distributor, Merrill Lynch, Pierce,
Fenner & Smith Inc. ("MLPF&S"), a subsidiary of ML & Co., also provides
account maintenance and distribution services to the Fund. The ongoing
account maintenance fee compensates the Distributor and MLPF&S for
providing account maintenance services to Class B, Class C and Class D
shareholders. The ongoing distribution fee compensates the Distributor
and MLPF&S for providing shareholder and distribution-related services
to Class B and Class C shareholders.

For the year ended July 31, 1997, MLFD earned underwriting discounts and
MLPF&S earned dealer concessions on sales of the Fund's Class A and
Class D Shares as follows:

                  MLFD                          MLPF&S

Class A           $40                            $490
Class D          $314                          $2,505

For the year ended July 31, 1997, MLPF&S received contingent deferred
sales charges of $84,387 and $1,089 relating to transactions in Class B
and Class C Shares, respectively.

Merrill Lynch Financial Data Services, Inc. ("MLFDS"), a wholly-owned
subsidiary of ML & Co., is the Fund's transfer agent.

Accounting services are provided to the Fund by FAM at cost.

Certain officers and/or trustees of the Fund are officers and/or
directors of FAM, PSI, MLFDS, MLFD, and/or ML & Co.

3. Investments:
Purchases and sales of investments, excluding short-term securities, for
the year ended July 31, 1997 were $14,969,794 and $21,153,593,
respectively.

Net realized and unrealized gains as of July 31, 1997 were as follows:

                                   Realized             Unrealized
                                     Gains                Gains

Long-term investments              $121,207             $5,067,329
                                 ----------             ----------
Total                              $121,207             $5,067,329
                                 ==========             ==========

As of July 31, 1997, net unrealized appreciation for Federal income tax
purposes aggregated $5,067,329, of which $5,182,592 related to
appreciated securities and $115,263 related to depreciated securities.
The aggregate cost of investments at July 31, 1997 for Federal income
tax purposes was $56,582,944 .

                                      62
<PAGE>
 
4. Beneficial Interest Transactions:
Net decrease in net assets derived from beneficial interest transactions
was $8,761,111 and $7,525,610 for the years ended July 31, 1997 and July
31, 1996, respectively.

Transactions in shares of beneficial interest for each class were as
follows:

Class A Shares for the Year                               Dollar
Ended July 31, 1997                Shares                 Amount

Shares sold                        65,128               $698,880
Shares issued to shareholders
in reinvestment of dividends       10,205                109,410
                               ----------             ----------
Total issued                       75,333                808,290
Shares redeemed                  (110,522)            (1,182,114)
                               ----------             ----------
Net decrease                      (35,189)             $(373,824)
                               ==========             ==========

Class A Shares for the Year                               Dollar
Ended July 31, 1996                Shares                 Amount

Shares sold                        11,145               $120,133
Shares issued to shareholders
in reinvestment of dividends       14,167                151,254
                               ----------             ----------
Total issued                       25,312                271,387
Shares redeemed                  (103,808)            (1,098,620)
                               ----------             ----------
Net decrease                      (78,496)             $(827,233)
                               ==========             ==========

Class B Shares for the Year                               Dollar
Ended July 31, 1997                Shares                 Amount

Shares sold                       376,343             $4,032,484
Shares issued to shareholders
in reinvestment of dividends      129,316              1,386,347
                               ----------             ----------
Total issued                      505,659              5,418,831
Automatic conversion of shares    (10,414)              (111,368)
Shares redeemed                (1,323,351)           (14,184,469)
                               ----------            -----------
Net decrease                     (828,106)           $(8,877,006)
                               ==========            ===========

Class B Shares for the Year                               Dollar
Ended July 31, 1996                Shares                 Amount

Shares sold                       571,636             $6,100,084
Shares issued to shareholders
in reinvestment of dividends      152,704              1,630,400
                               ----------            -----------
Total issued                      724,340              7,730,484
Shares redeemed                (1,475,480)           (15,689,139)
                               ----------            -----------
Net decrease                     (751,140)           $(7,958,655)
                               ==========            ===========

Class C Shares for the Year                               Dollar
Ended July 31, 1997                Shares                 Amount

Shares sold                       107,995             $1,154,305
Shares issued to shareholders
in reinvestment of dividends        5,142                 55,085
                               ----------            -----------
Total issued                      113,137              1,209,390
Shares redeemed                   (89,795)              (970,551)
                               ----------            -----------
Net increase                       23,342               $238,839
                               ==========            ===========

Class C Shares for the Year                               Dollar
Ended July 31, 1996                Shares                 Amount

Shares sold                        89,824               $961,975
Shares issued to shareholders
in reinvestment of dividends        3,434                 28,126
                               ----------            -----------
Total issued                       93,258                990,101
Shares redeemed                   (22,777)              (247,358)
                               ----------            -----------
Net increase                       70,481               $742,743
                               ==========            ===========

Class D Shares for the Year                               Dollar
Ended July 31, 1997                Shares                 Amount

Shares sold                        33,863               $366,272
Automatic conversion of shares     10,412                111,368
Shares issued to shareholders
in reinvestment of dividends          843                  9,054
                               ----------            -----------
Total issued                       45,118                486,694
Shares redeemed                   (22,113)              (235,814)
                               ----------            -----------
Net increase                       23,005               $250,880
                               ==========            ===========

Class D Shares for the Year                               Dollar
Ended July 31, 1996                Shares                 Amount

Shares sold                        95,688             $1,010,719
Shares issued to shareholders
in reinvestment of dividends          876                  9,371
                               ----------            -----------
Total issued                       96,564              1,020,090
Shares redeemed                   (46,657)              (502,555)
                               ----------            -----------
Net increase                       49,907               $517,535
                               ==========            ===========

5. Capital Loss Carryforward:
At July 31, 1997, the Fund had a net capital loss carryforward of
approximately $1,154,000, all of which expires in 2003. This amount will
be available to offset like amounts of any future taxable gains.

                                      63
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>   
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Investment Objective and Policies..........................................   2
Description of Municipal Bonds and Temporary Investments...................   5
 Description of Municipal Bonds............................................   5
 Description of Temporary Investments......................................   7
 Repurchase Agreements.....................................................   8
 Financial Futures Transactions and Options................................   9
Investment Restrictions....................................................  13
Management of the Trust....................................................  15
 Trustees and Officers.....................................................  15
 Compensation of Trustees..................................................  17
 Management and Advisory Arrangements......................................  18
Purchase of Shares.........................................................  19
 Initial Sales Charge Alternatives--Class A and Class D Shares.............  20
 Reduced Initial Sales Charges.............................................  21
 Distribution Plans........................................................  23
 Limitations on the Payment of Deferred Sales Charges......................  24
Redemption of Shares.......................................................  25
 Deferred Sales Charges--Class B and Class C Shares........................  26
Portfolio Transactions.....................................................  26
Determination of Net Asset Value...........................................  27
Shareholder Services.......................................................  28
 Investment Account........................................................  28
 Automatic Investment Plans................................................  29
 Automatic Reinvestment of Dividends and Capital Gains Distributions.......  29
 Systematic Withdrawal Plans...............................................  29
 Exchange Privilege........................................................  31
Distributions and Taxes....................................................  33
 Tax Treatment of Option and Futures Transactions..........................  36
Performance Data...........................................................  37
General Information........................................................  39
 Description of Shares.....................................................  39
 Computation of Offering Price Per Share...................................  40
 Independent Auditors......................................................  41
 Custodian.................................................................  41
 Transfer Agent............................................................  41
 Legal Counsel.............................................................  41
 Reports to Shareholders...................................................  41
 Additional Information....................................................  41
Appendix I--Economic and Financial Conditions in Massachusetts.............  42
Appendix II--Ratings of Municipal Bonds....................................  45
Independent Auditors' Report...............................................  52
Financial Statements.......................................................  53
</TABLE>    
                                                             
                                                          Code # 16149-1097     
 

[LOGO] MERRILL LYNCH

Merrill Lynch
Massachusetts Municipal 
Bond Fund
Merrill Lynch Multi-State
Municipal Series Trust

[ART] 

STATEMENT OF 
ADDITIONAL 
INFORMATION
    
October 28, 1997      

Distributor:
Merrill Lynch
Funds Distributor, Inc. 
 
<PAGE>
 
                           PART C. OTHER INFORMATION
 
ITEM 24. FINANCIAL STATEMENTS AND EXHIBITS.
 
  (A)FINANCIAL STATEMENTS
 
    Contained in Part A:
        
     Financial Highlights for each of the years in the five-year period
      ended July 31, 1997 and for the period February 28, 1992
      (commencement of operations) to July 31, 1992.     
 
    Contained in Part B:
        
     Schedule of Investments as of July 31, 1997.     
        
     Statement of Assets and Liabilities as of July 31, 1997.     
        
     Statement of Operations for the year ended July 31, 1997.     
        
     Statements of Changes in Net Assets for each of the years in the two-
      year period ended July 31, 1997.     
        
     Financial Highlights for each of the years in the five-year period
      ended July 31, 1997.     
 
  (B)EXHIBITS
 
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER
 -------
 <C>     <S>
   1(a)  --Declaration of Trust of the Registrant, dated August 2, 1985.(a)
    (b)  --Amendment to Declaration of Trust, dated September 18, 1987.(a)
    (c)  --Amendment to Declaration of Trust, dated December 21, 1987.(a)
    (d)  --Amendment to Declaration of Trust, dated October 3, 1988.(a)
    (e)  --Amendment to Declaration of Trust, dated October 17, 1994 and
          instrument establishing Class C and Class D shares of beneficial
          interest.(a)
    (f)  --Instrument establishing Merrill Lynch Massachusetts Municipal Bond
          Fund (the "Fund") as a series of Registrant.(a)
    (g)  --Instrument establishing Class A and Class B shares of beneficial
          interest of the Fund.(a)
   2     --By-Laws of Registrant.(a)
   3     --None.
   4     --Portions of the Declaration of Trust, Establishment and Designation
          and By-Laws of the Registrant defining the rights of holders of the
          Fund as a series of the Registrant.(b)
   5(a)  --Form of Management Agreement between Registrant and Fund Asset
          Management, L.P.(a)
    (b)  --Supplement to Management Agreement between Registrant and Fund Asset
          Management, L.P.(e)
   6(a)  --Form of Revised Class A Shares Distribution Agreement between
          Registrant and Merrill Lynch Funds Distributor, Inc. (including Form
          of Selected Dealers Agreement).(e)
    (b)  --Form of Class B Shares Distribution Agreement between Registrant and
          Merrill Lynch Funds Distributor, Inc.(a)
    (c)  --Form of Class C Shares Distribution Agreement between Registrant and
          Merrill Lynch Funds Distributor, Inc. (including Form of Selected
          Dealers Agreement).(e)
    (d)  --Form of Class D Shares Distribution Agreement between Registrant and
          Merrill Lynch Funds Distributor, Inc. (including Form of Selected
          Dealers Agreement).(e)
    (e)  --Letter Agreement between the Fund and Merrill Lynch Funds
          Distributor, Inc., dated September 15, 1993, in connection with the
          Merrill Lynch Mutual Fund Adviser program.(c)
   7     --None.
   8     --Form of Custody Agreement between Registrant and State Street Bank &
          Trust Company.(d)
   9     --Form of Transfer Agency, Dividend Disbursing Agency and Shareholder
          Servicing Agency Agreement between Registrant and Merrill Lynch
          Financial Data Services, Inc.(f)
</TABLE>
 
                                      C-1
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
 NUMBER
 -------
 <C>     <S>
     10  --None.
     11  --Consent of Deloitte & Touche LLP, independent auditors for the
          Registrant.
     12  --None.
     13  --Certificate of Fund Asset Management, L.P.(a)
     14  --None.
  15(a)  --Amended and Restated Class B Distribution Plan of the Registrant and
          Amended and Restated Class B Distribution Plan Sub-Agreement. (c)
    (b)  --Form of Class C Distribution Plan and Class C Shares Distribution
          Plan Sub-Agreement of Registrant.(e)
    (c)  --Form of Class D Distribution Plan and Class D Distribution Plan Sub-
          Agreement of Registrant.(e)
  16(a)  --Schedule for computation of each performance quotation provided in
          the Registration Statement in response to Item 22 relating to Class A
          Shares.(a)
    (b)  --Schedule for computation of each performance quotation provided in
          the Registration Statement in response to Item 22 relating to Class B
          Shares.(a)
    (c)  --Schedule for computation of each performance quotation provided in
          the Registration Statement in response to Item 22 relating to Class C
          Shares.(a)
    (d)  --Schedule for computation of each performance quotation provided in
          the Registration Statement in response to Item 22 relating to Class D
          Shares.(a)
  17(a)  --Financial Data Schedule for Class A Shares.
    (b)  --Financial Data Schedule for Class B Shares.
    (c)  --Financial Data Schedule for Class C Shares.
    (d)  --Financial Data Schedule for Class D Shares.
     18  --Merrill Lynch Select PricingSM System Plan Pursuant to Rule 18f-
          3.(g)
</TABLE>    
- --------
   
(a) Filed on October 27, 1995 as an Exhibit to Post-Effective Amendment No. 5
    to Registrant's Registration Statement on Form N-1A under the Securities
    Act of 1933, as amended (File No. 33-35987) (the "Registration Statement").
           
(b) Reference is made to Article II, Section 2.3 and Articles V, VI, VIII, IX,
    X and XI of the Registrant's Declaration of Trust, as amended, filed as
    Exhibits 1(a), 1(b), 1(c), 1(d) and 1(e) with Post-Effective Amendment No.
    5 to the Registrant's Registration Statement; to the Certificates of
    Establishment and Designation establishing the Fund as a series of the
    Registrant and establishing Class A and Class B shares of beneficial
    interest of the Fund, filed as Exhibits 1(f) and 1(g), respectively, with
    Post-Effective Amendment No. 5 to the Registration Statement; and to
    Articles I, V and VI of the Registrant's By-Laws, filed as Exhibit 2 with
    Post-Effective Amendment No. 5 to the Registration Statement.     
   
(c) Filed on November 9, 1993 as an Exhibit to Post-Effective Amendment No. 3
    to Registrant's Registration Statement.     
 
(d) Incorporated by reference to Exhibit 8 to Post-Effective Amendment No. 3 to
    Registrant's Registration Statement on Form N-1A under the Securities Act
    of 1933, as amended, filed on October 14, 1994, relating to shares of
    Merrill Lynch Minnesota Municipal Bond Fund series of the Registrant (File
    No. 33-44734).
   
(e) Filed on October 17, 1994 as an Exhibit to Post-Effective Amendment No. 4
    to Registrant's Registration Statement.     
 
(f) Incorporated by reference to Exhibit 9 to Post-Effective Amendment No. 5 to
    Registrant's Registration Statement on Form N-1A under the Securities Act
    of 1933, as amended, filed on October 20, 1995, relating to shares of
    Merrill Lynch Arizona Municipal Bond Fund series of the Registrant (File
    No. 33-41311).
 
(g) Incorporated by reference to Exhibit 18 to Post-Effective Amendment No. 13
    to Registrant's Registration Statement on Form N-1A under the Securities
    Act of 1933, as amended, filed on January 25, 1996, relating to shares of
    Merrill Lynch New York Municipal Bond Fund series of the Registrant (File
    No. 2-99473).
 
ITEM 25. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT.
 
  Registrant is not controlled by or under common control with any other
person.
 
                                      C-2
<PAGE>
 
ITEM 26. NUMBER OF HOLDERS OF SECURITIES.
<TABLE>   
<CAPTION>
                                                                NUMBER OF
                                                            RECORD HOLDERS AT
                         TITLE OF CLASS                    SEPTEMBER 30, 1997*
                         --------------                    -------------------
      <S>                                                  <C>
      Class A Shares of beneficial interest, par value
       $0.10 per share....................................          153
      Class B Shares of beneficial interest, par value
       $0.10 per share....................................        1,622
      Class C Shares of beneficial interest, par value
       $0.10 per share....................................           56
      Class D Shares of beneficial interest, par value
       $0.10 per share....................................           39
</TABLE>    
- --------
* The number of holders includes holders of record plus beneficial owners whose
  shares are held of record by Merrill Lynch, Pierce, Fenner & Smith
  Incorporated.
 
ITEM 27. INDEMNIFICATION.
 
  Section 5.3 of the Registrant's Declaration of Trust provides as follows:
 
  "The Trust shall indemnify each of its Trustees, officers, employees and
agents (including persons who serve at its request as directors, officers or
trustees of another organization in which it has any interest as a shareholder,
creditor or otherwise) against all liabilities and expenses (including amounts
paid in satisfaction of judgments, in compromise, as fines and penalties and as
counsel fees) reasonably incurred by him in connection with the defense or
disposition of any action, suit or other proceeding, whether civil or criminal,
in which he may be involved or with which he may be threatened, while in office
or thereafter, by reason of his being or having been such a trustee, officer,
employee or agent, except with respect to any matter as to which he shall have
been adjudicated to have acted in bad faith, willful misfeasance, gross
negligence or reckless disregard of his duties; provided, however, that as to
any matter disposed of by a compromise payment by such person, pursuant to a
consent decree or otherwise, no indemnification either for said payment or for
any other expenses shall be provided unless the Trust shall have received a
written opinion from independent legal counsel approved by the Trustees to the
effect that if either the matter of willful misfeasance, gross negligence or
reckless disregard of duty, or the matter of good faith and reasonable belief
as to the best interests of the Trust, had been adjudicated, it would have been
adjudicated in favor of such person. The rights accruing to any Person under
these provisions shall not exclude any other right to which he may be lawfully
entitled; provided that no person may satisfy any right in indemnity or
reimbursement granted herein or in Section 5.1 or to which he may be otherwise
entitled except out of the property of the Trust, and no Shareholder shall be
personally liable to any Person with respect to any claim for indemnity or
reimbursement or otherwise. The Trustees may make advance payments in
connection with indemnification under this Section 5.3, provided that the
indemnified person shall have given a written undertaking to reimburse the
Trust in the event it is subsequently determined that he is not entitled to
such indemnification."
 
  Insofar as the conditional advancing of indemnification monies for actions
based upon the Investment Company Act of 1940, as amended, may be concerned,
such payments will be made only on the following conditions: (i) the advances
must be limited to amounts used, or to be used, for the preparation or
presentation of a defense to the action, including costs connected with the
preparation of a settlement; (ii) advances may be made only upon receipt of a
written promise by, or on behalf of, the recipient to repay that amount of the
advance which exceeds the amount which it is ultimately determined he is
entitled to receive from the Registrant by reason of indemnification; and (iii)
(a) such promise must be secured by a surety bond, other suitable insurance or
an equivalent form of security which assures that any repayments may be
obtained by the Registrant without delay or litigation, which bond, insurance
or other form of security must be provided by the recipient of the advance, or
(b) a majority of a quorum of the Registrant's disinterested, non-party
Trustees, or an independent legal counsel in a written opinion, shall
determine, based upon a review of readily available facts that the recipient of
the advance ultimately will be found entitled to indemnification.
 
  In Section 9 of the Distribution Agreements relating to the securities being
offered hereby, the Registrant agrees to indemnify the Distributor and each
person, if any, who controls the Distributor within the meaning of the
Securities Act of 1933 (the "1933 Act"), against certain types of civil
liabilities arising in connection with the Registration Statement or Prospectus
and Statement of Additional Information.
 
                                      C-3
<PAGE>
 
  Insofar as indemnification for liabilities arising under the 1933 Act may be
permitted to Trustees, officers and controlling persons of the Registrant and
the principal underwriter pursuant to the foregoing provisions or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the 1933 Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a Trustee, officer, or controlling
person of the Registrant and the principal underwriter in connection with the
successful defense of any action, suit or proceeding) is asserted by such
Trustee, officer or controlling person or the principal underwriter in
connection with the shares being registered, the Registrant will, unless in the
opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the 1933 Act and
will be governed by the final adjudication of such issue.
 
ITEM 28. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER.
   
  Fund Asset Management, L.P. (the "Manager" or "FAM") acts as the investment
adviser for the following open-end registered investment companies: CBA Money
Fund, CMA Government Securities Fund, CMA Money Fund, CMA Multi-State Municipal
Series Trust, CMA Tax-Exempt Fund, CMA Treasury Fund, The Corporate Fund
Accumulation Program, Inc., Financial Institutions Series Trust, Merrill Lynch
Basic Value Fund, Inc., Merrill Lynch California Municipal Series Trust,
Merrill Lynch Corporate Bond Fund, Inc., Merrill Lynch Emerging Tigers Fund,
Inc., Merrill Lynch Federal Securities Trust, Merrill Lynch Funds for
Institutions Series, Merrill Lynch Multi-State Limited Maturity Municipal
Series Trust, Merrill Lynch Multi-State Municipal Series Trust, Merrill Lynch
Municipal Bond Fund, Inc., Merrill Lynch Phoenix Fund, Inc., Merrill Lynch
Special Value Fund, Inc., Merrill Lynch World Income Fund, Inc. and The
Municipal Fund Accumulation Program, Inc.; and the following closed-end
registered investment companies: Apex Municipal Fund, Inc., Corporate High
Yield Fund, Inc., Corporate High Yield Fund II, Inc., Debt Strategies Fund,
Inc., Income Opportunities Fund 1999, Inc., Income Opportunities Fund 2000,
Inc., Merrill Lynch Municipal Strategy Fund, Inc., MuniAssets Fund, Inc.,
MuniEnhanced Fund, Inc., MuniHoldings California Insured Fund, Inc.,
MuniHoldings Florida Insured Fund, MuniHoldings Fund, Inc., MuniHoldings New
York Insured Fund, Inc., MuniInsured Fund, Inc., MuniVest Fund, Inc., MuniVest
Fund II, Inc., MuniVest Florida Fund, MuniVest Michigan Insured Fund, Inc.,
MuniVest New Jersey Fund, Inc., MuniVest Pennsylvania Insured Fund, MuniYield
Arizona Fund, Inc., MuniYield California Fund, Inc., MuniYield California
Insured Fund, Inc., MuniYield California Insured Fund II, Inc., MuniYield
Florida Fund, MuniYield Florida Insured Fund, MuniYield Fund, Inc., MuniYield
Insured Fund, Inc., MuniYield Michigan Fund, Inc., MuniYield Michigan Insured
Fund, Inc., MuniYield New Jersey Fund, Inc., MuniYield New Jersey Insured Fund,
Inc., MuniYield New York Insured Fund, Inc., MuniYield New York Insured Fund
II, Inc., MuniYield Pennsylvania Fund, MuniYield Quality Fund, Inc., MuniYield
Quality Fund II, Inc., Senior High Income Portfolio, Inc., Taurus
MuniCalifornia Holdings, Inc., Taurus MuniNewYork Holdings, Inc. and Worldwide
DollarVest Fund, Inc.     
   
  Merrill Lynch Asset Management, L.P. ("MLAM"), an affiliate of the Manager,
acts as the investment adviser for the following open-end registered investment
companies: Merrill Lynch Adjustable Rate Securities Fund, Inc., Merrill Lynch
Americas Income Fund, Inc., Merrill Lynch Asset Builder Program, Inc., Merrill
Lynch Asset Growth Fund, Inc., Merrill Lynch Asset Income Fund, Inc., Merrill
Lynch Capital Fund, Inc., Merrill Lynch Convertible Fund, Inc., Merrill Lynch
Developing Capital Markets Fund, Inc., Merrill Lynch Dragon Fund, Inc., Merrill
Lynch EuroFund, Merrill Lynch Fundamental Growth Fund, Inc., Merrill Lynch Fund
For Tomorrow, Inc., Merrill Lynch Global Allocation Fund, Inc., Merrill Lynch
Global Bond Fund for Investment and Retirement, Merrill Lynch Global
Convertible Fund, Inc., Merrill Lynch Global Growth Fund, Inc., Merrill Lynch
Global Holdings, Inc., Merrill Lynch Global Resources Trust, Merrill Lynch
Global SmallCap Fund, Inc., Merrill Lynch Global Utility Fund, Inc., Merrill
Lynch Global Value Fund, Inc., Merrill Lynch Growth Fund, Merrill Lynch
Healthcare Fund, Inc., Merrill Lynch Intermediate Government Bond Fund, Merrill
Lynch International Equity Fund, Merrill Lynch Latin America Fund, Inc.,
Merrill Lynch Middle East/Africa Fund, Inc., Merrill Lynch Municipal Series
Trust, Merrill Lynch Pacific     
 
                                      C-4
<PAGE>
 
   
Fund, Inc., Merrill Lynch Ready Assets Trust, Merrill Lynch Retirement Series
Trust, Merrill Lynch Series Fund, Inc., Merrill Lynch Short-Term Global Income
Fund, Inc., Merrill Lynch Strategic Dividend Fund, Merrill Lynch Technology
Fund, Inc., Merrill Lynch U.S.A. Government Reserves, Merrill Lynch U.S.
Treasury Money Fund, Merrill Lynch Utility Income Fund, Inc., Merrill Lynch
Variable Series Funds, Inc. and Hotchkis and Wiley Funds (advised by Hotchkis
and Wiley, a division of MLAM); and the following closed-end registered
investment companies: Merrill Lynch High Income Municipal Bond Fund, Inc. and
Merrill Lynch Senior Floating Rate Fund, Inc. MLAM also acts as sub-adviser to
Merrill Lynch World Strategy Portfolio and Merrill Lynch Basic Value Equity
Portfolio, two investment portfolios of EQ Advisor Trust.     
   
  The address of each of these investment companies is P.O. Box 9011,
Princeton, New Jersey 08543-9011, except that the address of Merrill Lynch
Funds for Institutions Series and Merrill Lynch Intermediate Government Bond
Fund is One Financial Center, 23rd Floor, Boston, Massachusetts 02111-2646. The
address of the Manager, MLAM, Princeton Services, Inc. ("Princeton Services")
and Princeton Administrators, L.P. is also P.O. Box 9011, Princeton, New Jersey
08543-9011. The address of Merrill Lynch Funds Distributor, Inc. ("MLFD") is
P.O. Box 9081, Princeton, New Jersey 08543-9081. The address of Merrill Lynch,
Pierce, Fenner & Smith Incorporated ("Merrill Lynch") and Merrill Lynch & Co.,
Inc. ("ML & Co.") is World Financial Center, North Tower, 250 Vesey Street, New
York, New York 10281. The address of the Fund's transfer agent, Merrill Lynch
Financial Data Services, Inc. ("MLFDS"), is 4800 Deer Lake Drive East,
Jacksonville, Florida 32246-6484.     
   
  Set forth below is a list of each executive officer and partner of the
Manager indicating each business, profession, vocation or employment of a
substantial nature in which each such person or entity has been engaged since
August 1, 1995 for his or its own account or in the capacity of director,
officer, partner or trustee. In addition, Mr. Zeikel is President, Mr. Glenn is
Executive Vice President and Mr. Richard is Treasurer of substantially all of
the investment companies described in the first two paragraphs of this Item 28
and Messrs. Giordano, Harvey, Kirstein and Monagle are directors, trustees or
officers of one or more of such companies.     
 
  Officers and partners of FAM are set forth as follows:
 
<TABLE>   
<CAPTION>
                                                           OTHER SUBSTANTIAL BUSINESS,
           NAME           POSITION(S) WITH THE MANAGER PROFESSION, VOCATION OR EMPLOYMENT
           ----           ---------------------------- ----------------------------------
 <C>                      <C>                          <S>
 ML & Co. ...............    Limited Partner              Financial Services Holding
                                                           Company; Limited Partner of
                                                           MLAM
 Princeton Services......    General Partner              General Partner of MLAM
 Arthur Zeikel...........    President                    President of MLAM; President
                                                           and Director of Princeton
                                                           Services; Executive Vice
                                                           President of ML & Co.
 Terry K. Glenn..........    Executive Vice               Executive Vice President of
                              President                    MLAM; Executive Vice
                                                           President and Director of
                                                           Princeton Services;
                                                           President and Director of
                                                           MLFD; Director of MLFDS;
                                                           President of Princeton
                                                           Administrators, L.P.
 Linda L. Federici.......    Senior Vice President        Senior Vice President of MLAM
 Vincent R. Giordano.....    Senior Vice President        Senior Vice President of
                                                           MLAM; Senior Vice President
                                                           of Princeton Services
 Elizabeth A. Griffin....    Senior Vice President        Senior Vice President of MLAM
 Norman R. Harvey........    Senior Vice President        Senior Vice President of
                                                           MLAM; Senior Vice President
                                                           of Princeton Services
 Michael J. Hennewinkel..    Senior Vice President        Senior Vice President of
                                                           MLAM; Senior Vice President
                                                           of Princeton Services
</TABLE>    
 
                                      C-5
<PAGE>
 
<TABLE>   
<CAPTION>
                                                           OTHER SUBSTANTIAL BUSINESS,
           NAME           POSITION(S) WITH THE MANAGER PROFESSION, VOCATION OR EMPLOYMENT
           ----           ---------------------------- ----------------------------------
 <C>                      <C>                          <S>
 Philip L. Kirstein......    Senior Vice                  Senior Vice President,
                              President, General           General Counsel and
                              Counsel and                  Secretary of MLAM; Senior
                              Secretary                    Vice President, General
                                                           Counsel, Secretary and
                                                           Director of Princeton
                                                           Services
 Ronald M. Kloss.........    Senior Vice President        Senior Vice President and
                              and Controller               Controller of MLAM; Senior
                                                           Vice President and
                                                           Controller of Princeton
                                                           Services
 Debra Landsman-Yaros....    Senior Vice President        Senior Vice President of MLAM
 Stephen M.M. Miller.....    Senior Vice President        Executive Vice President of
                                                           Princeton Administrators,
                                                           L.P.; Senior Vice President
                                                           of Princeton Services
 Joseph T. Monagle, Jr. .    Senior Vice President        Senior Vice President of
                                                           MLAM; Senior Vice President
                                                           of Princeton Services
 Michael L. Quinn........    Senior Vice President        Senior Vice President of
                                                           MLAM; Senior Vice President
                                                           of Princeton Services;
                                                           Managing Director and First
                                                           Vice President of Merrill
                                                           Lynch from 1989 to 1995.
 Richard L. Reller.......    Senior Vice President        Senior Vice President of
                                                           MLAM; Senior Vice President
                                                           of Princeton Services;
                                                           Director of MLFD
 Gerald M. Richard.......    Senior Vice President        Senior Vice President and
                              and Treasurer                Treasurer of MLAM; Senior
                                                           Vice President and Treasurer
                                                           of Princeton Services; Vice
                                                           President and Treasurer of
                                                           MLFD
 Gregory Upah............    Senior Vice President        Senior Vice President of MLAM
 Ronald L. Welburn.......    Senior Vice President        Senior Vice President of
                                                           MLAM; Senior Vice President
                                                           of Princeton Services
</TABLE>    
 
ITEM 29. PRINCIPAL UNDERWRITERS.
 
  (a) MLFD acts as the principal underwriter for the Registrant and for each of
the open-end investment companies referred to in the first two paragraphs of
Item 28 except CBA Money Fund, CMA Government Securities Fund, CMA Money Fund,
CMA Multi-State Municipal Series Trust, CMA Tax-Exempt Fund, CMA Treasury Fund,
The Corporate Fund Accumulation Program, Inc., and The Municipal Fund
Accumulation Program, Inc. and MLFD also acts as the principal underwriter for
the following closed-end investment companies: Merrill Lynch High Income
Municipal Bond Fund, Inc., Merrill Lynch Municipal Strategy Fund, Inc. and
Merrill Lynch Senior Floating Rate Fund, Inc.
 
                                      C-6
<PAGE>
 
   
  (b) Set forth below is information concerning each director and officer of
MLFD. The principal business address of each such person is P.O. Box 9011,
Princeton, New Jersey 08543-9011, except that the address of Messrs. Aldrich,
Brady, Breen, Crook, Fatseas and Wasel is One Financial Center, 23rd Floor,
Boston, Massachusetts 02111-2665.     
 
<TABLE>   
<CAPTION>
                            POSITION(S) AND OFFICES    POSITION(S) AND OFFICES
         NAME                      WITH MLFD               WITH REGISTRANT
         ----               -----------------------    -----------------------
<S>                       <C>                          <C>
Terry K. Glenn........... President and Director       Executive Vice President
Richard L. Reller........ Director                     None
Thomas J. Verage......... Director                     None
William E. Aldrich....... Senior Vice President        None
Robert W. Crook.......... Senior Vice President        None
Michael J. Brady......... Vice President               None
William M. Breen......... Vice President               None
Michael G. Clark......... Vice President               None
James T. Fatseas......... Vice President               None
Debra W. Landsman-Yaros.. Vice President               None
Michelle T. Lau.......... Vice President               None
Gerald M. Richard........ Vice President and Treasurer Treasurer
Salvatore Venezia........ Vice President               None
William Wasel............ Vice President               None
Robert Harris............ Secretary                    None
</TABLE>    
 
  (c) Not applicable.
 
ITEM 30. LOCATION OF ACCOUNTS AND RECORDS.
 
  All accounts, books and other documents required to be maintained by Section
31(a) of the Investment Company Act of 1940, as amended, and the rules
thereunder are maintained at the offices of the Registrant, 800 Scudders Mill
Road, Plainsboro, New Jersey 08536, and Merrill Lynch Financial Data Services,
Inc., 4800 Deer Lake Drive East, Jacksonville, Florida 32246-6484.
 
ITEM 31. MANAGEMENT SERVICES.
 
  Other than as set forth under the caption "Management of the Trust--
Management and Advisory Arrangements" in the Prospectus constituting Part A of
the Registration Statement and under "Management of the Trust--Management and
Advisory Arrangements" in the Statement of Additional Information constituting
Part B of the Registration Statement, Registrant is not a party to any
management-related service contract.
 
ITEM 32. UNDERTAKINGS.
 
  (a) Not applicable.
 
  (b) Not applicable.
 
  (c) Registrant undertakes to furnish each person to whom a Prospectus is
delivered with a copy of the Registrant's latest annual report to shareholders,
upon request and without charge.
 
                                      C-7
<PAGE>
 
                                   SIGNATURES
   
  Pursuant to the requirements of the Securities Act of 1933 and the Investment
Company Act of 1940, the Registrant certifies that it meets all of the
requirements for effectiveness of this Post-Effective Amendment to its
Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933
and has duly caused this Post-Effective Amendment to its Registration Statement
to be signed on its behalf by the undersigned, thereunto duly authorized, in
the Township of Plainsboro, and the State of New Jersey, on the 27th day of
October, 1997.     
 
                                          Merrill Lynch Multi-State Municipal
                                           Series Trust
                                                      (Registrant)
 
                                                   /s/ Gerald M. Richard
                                          By: _________________________________
                                              (GERALD M. RICHARD, TREASURER)
   
  Pursuant to the requirements of the Securities Act of 1933, this Post-
Effective Amendment to its Registration Statement has been signed below by the
following persons in the capacities and on the date(s) indicated.     
 
              SIGNATURE                         TITLE                DATE
 
           Arthur Zeikel*               President and
- -------------------------------------    Trustee
           (ARTHUR ZEIKEL)               (Principal Executive Officer)
 
                                        Treasurer (Principal Financial
       Gerald M. Richard*                and Accounting
                                         Officer)
                                                                        
                                                                         
- -------------------------------------
         (GERALD M. RICHARD)
 
         James H. Bodurtha*             Trustee
- -------------------------------------
         (JAMES H. BODURTHA)
 
         Herbert I. London*             Trustee
- -------------------------------------
         (HERBERT I. LONDON)
 
          Robert R. Martin*             Trustee
- -------------------------------------
         (ROBERT R. MARTIN)
 
           Joseph L. May*               Trustee
- -------------------------------------
           (JOSEPH L. MAY)
 
          Andre F. Perold*              Trustee
- -------------------------------------
          (ANDRE F. PEROLD)
 
 
        /s/ Gerald M. Richard                                       
*By: ________________________________                            October 27,
  (GERALD M. RICHARD, ATTORNEY-IN-                                1997     
                FACT)
 
                                      C-8
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>   
<CAPTION>
 EXHIBIT
 NUMBER                             DESCRIPTION
 -------                            -----------
 <C>     <S>                                                                <C>
  11     --Consent of Deloitte & Touche LLP, independent auditors for the
          Registrant.
  17(a)  --Financial Data Schedule for Class A Shares.
    (b)  --Financial Data Schedule for Class B Shares.
    (c)  --Financial Data Schedule for Class C Shares.
    (d)  --Financial Data Schedule for Class D Shares.
</TABLE>    
<PAGE>
 
APPENDIX FOR GRAPHIC AND IMAGE MATERIAL

        Pursuant to Rule 304 of Regulation S-T, the following table presents 
fair and accurate narrative descriptions of graphic and image material omitted 
from this EDGAR Submission file due to ASCII-incompatibility and cross-
references this material to the location of each occurrence in the text.

DESCRIPTION OF OMITTED                  LOCATION OF GRAPHIC
  GRAPHIC OF IMAGE                        OR IMAGE IN TEXT
- ----------------------                  -------------------
Compass plate, circular              Back cover of prospectus and
graph paper and Merrill Lynch         back cover of Statement of 
logo including stylized market           Additional Information
bull

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 001
   <NAME> M/L MASSACHUSETTS MUNI BOND FUND FOR CLASS A SHARES
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUL-31-1997
<PERIOD-START>                             AUG-01-1996
<PERIOD-END>                               JUL-31-1997
<INVESTMENTS-AT-COST>                         56582944
<INVESTMENTS-AT-VALUE>                        61650273
<RECEIVABLES>                                   670797
<ASSETS-OTHER>                                  167264
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                62488334
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       298759
<TOTAL-LIABILITIES>                             298759
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      58695477
<SHARES-COMMON-STOCK>                           519994
<SHARES-COMMON-PRIOR>                           555183
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (1573231)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       5067329
<NET-ASSETS>                                   5757323
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              3910891
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (832871)
<NET-INVESTMENT-INCOME>                        3078020
<REALIZED-GAINS-CURRENT>                        121207
<APPREC-INCREASE-CURRENT>                      2599000
<NET-CHANGE-FROM-OPS>                          5798227
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (291690)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          65128
<NUMBER-OF-SHARES-REDEEMED>                   (110522)
<SHARES-REINVESTED>                              10205
<NET-CHANGE-IN-ASSETS>                       (6040904)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (1621661)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                     (72777)
<GROSS-ADVISORY-FEES>                           355290
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 832871
<AVERAGE-NET-ASSETS>                           5583646
<PER-SHARE-NAV-BEGIN>                            10.60
<PER-SHARE-NII>                                    .56
<PER-SHARE-GAIN-APPREC>                            .47
<PER-SHARE-DIVIDEND>                             (.56)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              11.07
<EXPENSE-RATIO>                                    .83
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 002
   <NAME> M/L MASSACHUSETTS MUNI BOND FUND FOR CLASS B SHARES
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUL-31-1997
<PERIOD-START>                             AUG-01-1996
<PERIOD-END>                               JUL-31-1997
<INVESTMENTS-AT-COST>                         56582944
<INVESTMENTS-AT-VALUE>                        61650273
<RECEIVABLES>                                   670797
<ASSETS-OTHER>                                  167264
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                62488334
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       298759
<TOTAL-LIABILITIES>                             298759
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      58695477
<SHARES-COMMON-STOCK>                          4817405
<SHARES-COMMON-PRIOR>                          5645511
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (1573231)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       5067329
<NET-ASSETS>                                  53335618
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              3910891
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (832871)
<NET-INVESTMENT-INCOME>                        3078020
<REALIZED-GAINS-CURRENT>                        121207
<APPREC-INCREASE-CURRENT>                      2599000
<NET-CHANGE-FROM-OPS>                          5798227
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (2644286)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         376343
<NUMBER-OF-SHARES-REDEEMED>                  (1333765)
<SHARES-REINVESTED>                             129316
<NET-CHANGE-IN-ASSETS>                       (6040904)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (1621661)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                     (72777)
<GROSS-ADVISORY-FEES>                           355290
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 832871
<AVERAGE-NET-ASSETS>                          56090968
<PER-SHARE-NAV-BEGIN>                            10.60
<PER-SHARE-NII>                                    .51
<PER-SHARE-GAIN-APPREC>                            .47
<PER-SHARE-DIVIDEND>                             (.51)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              11.07
<EXPENSE-RATIO>                                   1.34
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 003
   <NAME> M/L MASSACHUSETTS MUNI BOND FUND FOR CLASS C SHARES
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUL-31-1997
<PERIOD-START>                             AUG-01-1996
<PERIOD-END>                               JUL-31-1997
<INVESTMENTS-AT-COST>                         56582944
<INVESTMENTS-AT-VALUE>                        61650273
<RECEIVABLES>                                   670797
<ASSETS-OTHER>                                  167264
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                62488334
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       298759
<TOTAL-LIABILITIES>                             298759
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      58695477
<SHARES-COMMON-STOCK>                           135135
<SHARES-COMMON-PRIOR>                           111793
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (1573231)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       5067329
<NET-ASSETS>                                   1494984
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              3910891
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (832871)
<NET-INVESTMENT-INCOME>                        3078020
<REALIZED-GAINS-CURRENT>                        121207
<APPREC-INCREASE-CURRENT>                      2599000
<NET-CHANGE-FROM-OPS>                          5798227
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (72540)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         107995
<NUMBER-OF-SHARES-REDEEMED>                    (89795)
<SHARES-REINVESTED>                               5142
<NET-CHANGE-IN-ASSETS>                       (6040904)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (1621661)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                     (72777)
<GROSS-ADVISORY-FEES>                           355290
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 832871
<AVERAGE-NET-ASSETS>                           1567820
<PER-SHARE-NAV-BEGIN>                            10.60
<PER-SHARE-NII>                                    .49
<PER-SHARE-GAIN-APPREC>                            .46
<PER-SHARE-DIVIDEND>                             (.49)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              11.06
<EXPENSE-RATIO>                                   1.43
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 004
   <NAME> M/L MASSACHUSETTS MUNI BOND FUND FOR CLASS D SHARES
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUL-31-1997
<PERIOD-START>                             AUG-01-1996
<PERIOD-END>                               JUL-31-1997
<INVESTMENTS-AT-COST>                         56582944
<INVESTMENTS-AT-VALUE>                        61650273
<RECEIVABLES>                                   670797
<ASSETS-OTHER>                                  167264
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                62488334
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       298759
<TOTAL-LIABILITIES>                             298759
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      58695477
<SHARES-COMMON-STOCK>                           144619
<SHARES-COMMON-PRIOR>                           121614
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (1573231)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       5067329
<NET-ASSETS>                                   1601650
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              3910891
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (832871)
<NET-INVESTMENT-INCOME>                        3078020
<REALIZED-GAINS-CURRENT>                        121207
<APPREC-INCREASE-CURRENT>                      2599000
<NET-CHANGE-FROM-OPS>                          5798227
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (69504)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          44275
<NUMBER-OF-SHARES-REDEEMED>                    (22113)
<SHARES-REINVESTED>                                843
<NET-CHANGE-IN-ASSETS>                       (6040904)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (1621661)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                     (72777)
<GROSS-ADVISORY-FEES>                           355290
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 832871
<AVERAGE-NET-ASSETS>                           1355758
<PER-SHARE-NAV-BEGIN>                            10.61
<PER-SHARE-NII>                                    .55
<PER-SHARE-GAIN-APPREC>                            .46
<PER-SHARE-DIVIDEND>                             (.55)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              11.07
<EXPENSE-RATIO>                                    .93
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<PAGE>
 
                                                                   EXHIBIT 99.11

INDEPENDENT AUDITORS' CONSENT

Merrill Lynch Massachusetts Municipal Bond Fund of
Merrill Lynch Multi-State Municipal Series Trust:

We consent to the use in Post-Effective Amendment No. 7 to Registration 
Statement No. 33-35987 of our report dated September 5, 1997 appearing in the 
Statement of Additional Information, which is a part of such Registration 
Statement, and to the reference to us under the caption "Financial Highlights"
appearing in the Prospectus, which also is a part of such Registration 
Statement. 

/s/ DELOITTE & TOUCHE LLP
Deloitte & Touche LLP
Princeton, New Jersey
October 28, 1997


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