MERRILL LYNCH MUNICIPAL BOND FUND INC
485B24E, 1996-10-25
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<PAGE>
 
    
 AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 25, 1996     
                                                               FILE NO. 2-57354
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                                ---------------
 
                                   FORM N-1A
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933         [X]
                                                                            [X]
                     POST-EFFECTIVE AMENDMENT NO. 21     
                                    AND/OR
        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940     [X]
                                                                            [X]
                             AMENDMENT NO. 20     
                       (CHECK APPROPRIATE BOX OR BOXES)
 
                                ---------------
 
                    MERRILL LYNCH MUNICIPAL BOND FUND, INC.
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
             P.O. BOX 9011                                   08543-9011
         PRINCETON, NEW JERSEY                               (ZIP CODE)
    (ADDRESS OF PRINCIPAL EXECUTIVE
               OFFICES)
       
    REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE (609) 282-2800     
 
                                 ARTHUR ZEIKEL
                    MERRILL LYNCH MUNICIPAL BOND FUND, INC.
                P.O. BOX 9011, PRINCETON, NEW JERSEY 08543-9011
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
 
        PHILIP L. KIRSTEIN, ESQ.                 LEONARD B. MACKEY, JR., ESQ.
         FUND ASSET MANAGEMENT                          ROGERS & WELLS
             P.O. BOX 9011                              200 PARK AVENUE
    PRINCETON, NEW JERSEY 08543-9011                 NEW YORK, N.Y. 10166
 
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.
 
                                ---------------
                        
                     CALCULATION OF REGISTRATION FEE     
 
- -------------------------------------------------------------------------------
<TABLE>   
- -------------------------------------------------------------------------------
<CAPTION>
                                          PROPOSED       PROPOSED
                           AMOUNT OF      MAXIMUM        MAXIMUM      AMOUNT OF
  TITLE OF SECURITIES     SHARES BEING OFFERING PRICE   AGGREGATE    REGISTRATION
    BEING REGISTERED       REGISTERED    PER SHARE    OFFERING PRICE     FEE
- ---------------------------------------------------------------------------------
<S>                       <C>          <C>            <C>            <C>
Shares of Insured Port-
 folio Common Stock, par
 value $0.10 per share..   62,587,789      $ 8.31      $109,999*         $100
- ---------------------------------------------------------------------------------
Shares of Limited Matu-
 rity Common Stock, par
 value $0.10 per share..   29,625,374      $10.03      $109,999**
- ---------------------------------------------------------------------------------
Shares of National Port-
 folio Common Stock, par
 value $0.10 per share..   34,901,870      $10.66      $109,989***
</TABLE>    
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
   
  * The calculation of the maximum aggregate offering price is made as of
  October 16, 1996 pursuant to Rule 24e-2 under the Investment Company Act of
  1940. The total amount of Insured Portfolio Common Stock redeemed or
  repurchased during Registrant's previous fiscal year was 62,574,552. None of
  such shares have been used for reductions pursuant to Rule 24e-2(a) or Rule
  24f-2(c) under the Investment Company Act of 1940 in previous filings during
  Registrant's current fiscal year. All 62,574,552 shares of Insured Portfolio
  Common Stock redeemed during Registrant's previous fiscal year are being
  used for the reduction of the registration fee in this post-effective
  amendment to the Registration Statement.     
   
 ** The calculation of the maximum aggregate offering price is made as of
  October 23, 1996 pursuant to Rule 24e-2 under the Investment Company Act of
  1940. The total amount of shares of Limited Maturity Portfolio Common Stock
  redeemed or repurchased during Registrant's previous fiscal year was
  29,614,407. None of such shares have been used for reductions pursuant to
  Rule 24e-2(a) or Rule 24f-2(c) under the Investment Company Act of 1940 in
  previous filings during Registrant's current fiscal year. All 29,614,407
  shares of Limited Maturity Common Stock redeemed during Registrant's
  previous fiscal year are being used for the reduction of the registration
  fee in this post-effective amendment to the Registration Statement.     
   
*** The calculation of the maximum aggregate offering price is made as of
  October 22, 1996 pursuant to Rule 24e-2 under the Investment Company Act of
  1940. The total amount of shares of National Portfolio Common Stock redeemed
  or repurchased during Registrant's previous fiscal year was 34,891,552. None
  of such shares have been used for reductions pursuant to Rule 24e-2(a) or
  Rule 24f-2(c) under the Investment Company Act of 1940 in previous filings
  during Registrant's current fiscal year. All 34,891,552 shares of National
  Portfolio Common Stock redeemed during Registrant's previous fiscal year are
  being used for reduction of the registration fee in this post-effective
  amendment to the Registration Statement.     
          
  THE REGISTRANT HAS REGISTERED AN INDEFINITE NUMBER OF CLASS A SHARES, CLASS
B SHARES, CLASS C SHARES AND CLASS D SHARES OF THE INSURED PORTFOLIO SERIES,
THE LIMITED MATURITY PORTFOLIO SERIES, AND THE HIGH YIELD PORTFOLIO SERIES
COMMON STOCK. THE NOTICE REQUIRED BY SUCH RULE FOR THE REGISTRANT'S MOST
RECENT YEAR WAS FILED ON AUGUST 21, 1996.     
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
                       MERRILL LYNCH MUNICIPAL BOND FUND
 
                             CROSS REFERENCE SHEET
<TABLE>   
<CAPTION>
  FORM
  N-1A                 ITEM NO.                                  LOCATION
  ----                 --------                                  --------
 <C>    <C>                                    <S>
 PART A
  1.    Cover Page............................ Cover Page
  2.    Synopsis.............................. Fee Table
  3.    Financial Highlights.................. Financial Highlights; Additional
                                                Information-Performance Data
  4.    General Description of Registrant..... Investment Objective and Policies;
                                                Investment Policies of the Portfolios
  5.    Management of the Fund ............... Fee Table; Investment Adviser; Directors;
                                                Portfolio Transactions; Additional
                                                Information
  5A.   Management's Discussion of Fund
        Performance........................... *
  6.    Capital Stock and Other Securities.... Cover Page; Dividends, Distributions and
                                                Taxes; Additional Information
  7.    Purchase of Securities Being Offered.. Cover Page; Merrill Lynch Select Pricing SM
                                                System; Fee Table; Purchase of Shares; Net
                                                Asset Value
  8.    Redemption or Repurchase.............. Merrill Lynch Select Pricing  SM System;
                                                Fee Table; Redemption of Shares;
                                                Shareholder Services
  9.    Pending Legal Proceedings............. *
 PART B                                                          LOCATION
                                                                 --------
  10.   Cover Page............................ Cover Page
  11.   Table of Contents..................... Table of Contents
  12.   General Information and History....... *
  13.   Investment Objectives and Policies.... Investment Objective and Policies;
                                                Investment Restrictions
  14.   Management of the Fund................ Management of the Fund
  15.   Control Persons and Principal Holders
        of Securities......................... Management of the Fund
  16.   Investment Advisory and Other
        Services.............................. Management of the Fund; Purchase of Shares
  17.   Brokerage Allocation and Other         
        Practices............................. Portfolio Transactions and Brokerage;
                                                Financial Statements                 
  18.   Capital Stock and Other Securities.... Additional Information
  19.   Purchase, Redemption and Pricing of    
        Securities Being Offered.............. Purchase of Shares; Net Asset Value,   
                                                Redemption of Shares; Systematic      
                                                Withdrawal Plans; Exchange Privilege; 
                                                Additional Information                 
  20.   Tax Status............................ Dividends, Distribution and Taxes
  21.   Underwriters.......................... Distributor
  22.   Calculations of Performance Data...... Performance Data
  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.
- --------
*  Item inapplicable or answer negative.
<PAGE>
 
PROSPECTUS
   
OCTOBER 25, 1996     
                    MERRILL LYNCH MUNICIPAL BOND FUND, INC.
  P.O. BOX 9011, PRINCETON, NEW JERSEY 08543-9011 . PHONE NO. (609) 282-2800
  Merrill Lynch Municipal Bond Fund, Inc. (the "Fund") is a professionally
managed, diversified, open-end investment company which seeks to provide
shareholders with as high a level of income exempt from Federal income taxes
as is consistent with the investment policies of each of its Portfolios and
prudent investment management. The Fund is a series fund and is comprised of
three separate Portfolios, each of which invests primarily in a diversified
portfolio of tax-exempt Municipal Bonds, principally consisting of state,
municipal and public authority securities. Each of the Portfolios pursues its
investment objective through the separate investment policies described below:
 
  Insured Portfolio invests primarily in long-term, investment grade Municipal
Bonds, each of which is covered by portfolio insurance guaranteeing the timely
payment of principal at maturity and interest.
 
  National Portfolio invests primarily in long-term medium to lower grade
Municipal Bonds offering higher yields than the Insured Portfolio but also
subject to greater risks than investment grade Municipal Bonds.
 
  Limited Maturity Portfolio invests in a portfolio primarily of investment
grade Municipal Bonds with a maximum maturity not to exceed four years and,
depending on market conditions, an average maturity of less than two years is
anticipated. The Limited Maturity Portfolio can be expected to offer the
lowest yield of the three Portfolios, but it will be subject to less market
risk than the longer-term Portfolios.
   
  For more information on the Fund's investment objective and policies, please
see "Investment Objective and Policies" on page 19.     
   
  Each Portfolio is, in effect, a separate fund issuing its own shares.
Pursuant to the Merrill Lynch Select Pricing SM System, each Portfolio of the
Fund offers four classes of shares, each with a different combination of sales
charges, ongoing fees and other features. Class C shares of the Limited
Maturity Portfolio are available only through the Exchange Privilege. 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 8.     
 
  Class A and Class D shares of the Fund's Portfolios may be purchased
directly from Merrill Lynch Funds Distributor, Inc. (the "Distributor"), P.O.
Box 9081, Princeton, New Jersey 08543-9081 (609 282-2800), or from securities
dealers which have entered into selected dealer agreements with the
Distributor, including Merrill Lynch, Pierce, Fenner & Smith Incorporated
("Merrill Lynch"). Class B and Class C shares of the Fund's Portfolios may
only be purchased either directly from the Distributor or Merrill Lynch. See
"Purchase of Shares" below. The minimum initial purchase for shares of each
Portfolio is $1,000, and the minimum subsequent purchase in each Portfolio is
$50. Merrill Lynch may charge its customers a processing fee (presently $4.85)
for confirming purchases and repurchases. Purchases and redemptions directly
through the Fund's transfer agent are not subject to the processing fee. See
"Purchase of Shares" and "Redemption of Shares." The net investment income of
each Portfolio is declared daily and paid monthly.
                               ----------------
THESE SECURITIES HAVE  NOT BEEN APPROVED OR DISAPPROVED BY  THE SECURITIES AND
 EXCHANGE  COMMISSION   OR   ANY   STATE   SECURITIES   COMMISSION   NOR   HAS
 THE SECURITIES  AND EXCHANGE COMMISSION  OR ANY STATE  SECURITIES COMMISSION
  PASSED  UPON   THE  ACCURACY   OR   ADEQUACY  OF   THIS   PROSPECTUS.   ANY
  REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                               ----------------
   
  This Prospectus sets forth in concise form the information about the Fund
that a prospective investor should know before investing in the Fund.
Investors should read and retain this Prospectus for future reference.
Additional information about the Fund has been filed with the Securities and
Exchange Commission in a Statement of Additional Information, dated October
25, 1996, and is available upon request and without charge, by calling or
writing the Fund at the address and telephone number set forth above. The
Statement of Additional Information is hereby incorporated by reference into
this Prospectus.     
 
                               ----------------
                  FUND ASSET MANAGEMENT -- INVESTMENT ADVISER
 
             MERRILL LYNCH FUNDS DISTRIBUTOR, INC. -- DISTRIBUTOR
<PAGE>
 
                               INSURED PORTFOLIO
 
                                   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 TRANSACTION
 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 purchase          None(d)  4.0% during the first year,    1.0% for one year  None(d)
  price or redemption                   decreasing 1.0% annually
  proceeds, whichever is              thereafter to 0.0% after the
  lower)................                      fourth year
 Exchange Fee...........     None                 None                     None         None
ANNUAL FUND OPERATING
 EXPENSES (AS A
 PERCENTAGE OF AVERAGE
 NET ASSETS):
 Management Fees(e).....     0.36%                 0.36%                   0.36%        0.36%
 12b-1 Fees(f):
 Account Maintenance
  Fees..................     None                  0.25%                   0.25%        0.25%
 Distribution Fees......     None                  0.50%                   0.55%        None
                                         (Class B shares convert to
                                        Class D shares automatically
                                          after approximately ten
                                                   years
                                          and cease being subject
                                           to distribution fees)
 Other Expenses:
 Custodial Fees.........     0.01%                 0.01%                   0.01%        0.01%
 Shareholder Servicing            
  Costs(g)..............     0.04%                 0.05%                   0.05%        0.04%
 Other..................     0.02%                 0.02%                   0.02%        0.02%
                             -----                 -----                   -----        -----
  Total Other Expenses..     0.07%                 0.08%                   0.08%        0.07%
                             -----                 -----                   -----        -----
 Total Fund Operating        0.43%                 1.19%                   1.24%        0.68%
  Expenses..............     =====                 =====                   =====        =====
</TABLE>    
- --------
   
(a) Class A shares are sold to a limited group of investors including existing
    Class A shareholders and certain investment programs. See "Purchase of
    Shares--Initial Sales Charge Alternatives--Class A and Class D Shares"--
    page 33.     
   
(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 36.     
          
(c) Reduced for purchases of $25,000 and over. Class A or 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 33.     
   
(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 which
    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.
        
          
(e) See "Investment Adviser"--page 28.     
   
(f) See "Purchase of Shares--Distribution Plans"--page 40.     
   
(g) See "Investment Adviser--Transfer Agency Services"--page 29.     
 
                                       2
<PAGE>
 
                                
                             INSURED PORTFOLIO     
 
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:
  Class A........................  $       44 $       53 $       63 $        92
  Class B........................  $       52 $       58 $       65 $       144
  Class C........................  $       23 $       39 $       68 $       150
  Class D........................  $       47 $       61 $       76 $       121
An investor would pay the
 following expenses on the same
 $1,000 investment assuming no
 redemption at the end of the
 period:
  Class A........................  $       44 $       53 $       63 $        92
  Class B........................  $       12 $       38 $       65 $       144
  Class C........................  $       13 $       39 $       68 $       150
  Class D........................  $       47 $       61 $       76 $       121
</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
Securities and Exchange Commission regulations. THE EXAMPLE SHOULD NOT BE
CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES OR ANNUAL RATES OF
RETURN, AND ACTUAL EXPENSES OR ANNUAL RATES OF RETURN MAY BE MORE OR LESS THAN
THOSE ASSUMED FOR PURPOSES OF THE EXAMPLE. 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
charges permitted under the Rules of Fair Practice of the National Association
of Securities Dealers, Inc. ("NASD"). Merrill Lynch may charge its customers a
processing fee (presently $4.85) for confirming purchases and redemptions.
Purchases and redemptions directly through the Fund's transfer agent are not
subject to the processing fee. See "Purchase of Shares" and "Redemption of
Shares."
 
                                       3
<PAGE>
 
                              NATIONAL PORTFOLIO
 
                                   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 TRANSACTION
 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 purchase          None(d)  4.0% during the first year,    1.0% for one year  None(d)
  price or redemption                   decreasing 1.0% annually
  proceeds, whichever is              thereafter to 0.0% after the
  lower)................                      fourth year
 Exchange Fee...........     None                 None                     None         None
ANNUAL FUND OPERATING
 EXPENSES (AS A
 PERCENTAGE OF AVERAGE
 NET ASSETS):
 Investment Advisory
  Fees(e)...............     0.47%                0.47%                    0.47%        0.47%
 12b-1 Fees(f):
 Account Maintenance
  Fees..................     None                 0.25%                    0.25%        0.25%
 Distribution Fees......     None                 0.50%                    0.55%        None
                                         (Class B shares convert to
                                        Class D shares automatically
                                          after approximately ten
                                                   years
                                          and cease being subject
                                           to distribution fees)
 Other Expenses:
 Custodial Fees.........     0.01%                0.01%                    0.01%        0.01%
 Shareholder Servicing             
  Costs(g)..............     0.04%                0.05%                    0.05%        0.04%
 Other..................     0.04%                0.04%                    0.04%        0.04%
                             -----                -----                    -----        -----
  Total Other Expenses..     0.09%                0.10%                    0.10%        0.09%
                             -----                -----                    -----        -----
 Total Fund Operating        0.56%                1.32%                    1.37%        0.81%
  Expenses..............     =====                =====                    =====        =====
</TABLE>    
- --------
   
(a) Class A shares are sold to a limited group of investors including existing
    Class A shareholders and certain investment programs. See "Purchase of
    Shares--Initial Sales Charge Alternatives--Class A and Class D Shares"--
    page 33.     
   
(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 36.     
          
(c) Reduced for purchases of $25,000 and over. Class A or Class D purchases of
    $1,000,000 or more may not be subject to an initial sales charge. See
    "Purchases of Shares--Initial Sales Charge Alternatives--Class A and Class
    D Shares"--page 33.     
   
(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 which
    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.
        
          
(e) See "Investment Adviser"--page 28.     
   
(f) See "Purchase of Shares--Distribution Plans"--page 40.     
   
(g) See "Investment Adviser--Transfer Agency Services"--page 29.     
 
                                       4
<PAGE>
 
                               
                            NATIONAL PORTFOLIO     
 
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 4, (2) a
 5% annual return throughout the
 periods and (3) redemption at
 the end of the period:
  Class A........................  $       46 $       57 $       70 $       107
  Class B........................  $       53 $       62 $       72 $       159
  Class C........................  $       24 $       43 $       75 $       165
  Class D........................  $       48 $       65 $       83 $       136
An investor would pay the
 following expenses on the same
 $1,000 investment assuming no
 redemption at the end of the
 period:
  Class A........................  $       46 $       57 $       70 $       107
  Class B........................  $       13 $       42 $       72 $       159
  Class C........................  $       14 $       43 $       75 $       165
  Class D........................  $       48 $       65 $       83 $       136
</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
Securities and Exchange Commission regulations. THE EXAMPLE SHOULD NOT BE
CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES OR ANNUAL RATES OF
RETURN, AND ACTUAL EXPENSES OR ANNUAL RATES OF RETURN MAY BE MORE OR LESS THAN
THOSE ASSUMED FOR PURPOSES OF THE EXAMPLE. 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
charges permitted under the Rules of Fair Practice of the National Association
of Securities Dealers, Inc. ("NASD"). Merrill Lynch may charge its customers a
processing fee (presently $4.85) for confirming purchases and redemptions.
Purchases and redemptions directly through the Fund's transfer agent are not
subject to the processing fee. See "Purchase of Shares" and "Redemption of
Shares."
 
                                       5
<PAGE>
 
                          LIMITED MATURITY PORTFOLIO
 
                                   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 TRANSACTION
 EXPENSES:
 Maximum Sales Charge
  Imposed on Purchases
  (as a percentage of
  offering price).......     1.00%(c)            None                    None         1.00%(c)
 Sales Charge Imposed on
  Dividend
  Reinvestments.........     None                None                    None         None
 Deferred Sales Charge
  (as a percentage of
  original purchase          None(d)  1.0% during the first year,  1.0% for one year  None(d)
  price or redemption                  decreasing to 0.0% after
  proceeds, whichever is                    the first year
  lower)................
 Exchange Fee...........     None                None                    None         None
ANNUAL FUND OPERATING
 EXPENSES (AS A
 PERCENTAGE OF AVERAGE
 NET ASSETS):
 Investment Advisory
  Fee(e)................     0.33%               0.33%                   0.33%        0.33%
 12b-1 Fees(f):
 Account Maintenance
  Fees..................     None                0.15%                   0.15%        0.10%
 Distribution Fees(g)...     None                0.20%                   0.20%        None
                                        (Class B shares convert to
                                              Class D shares
                                              automatically
                                         after approximately ten
                                                  years
                                         and cease being subject
                                          to distribution fees)
 Other Expenses:
 Custodial Fees.........     0.01%               0.01%                   0.01%        0.01%
 Shareholder Servicing            
  Costs(h)..............     0.04%               0.05%                   0.11%        0.04%
 Other..................     0.06%               0.06%                   0.06%        0.06%
                             -----               -----                   -----        -----
  Total Other Expenses..     0.11%               0.12%                   0.18%        0.11%
                             -----               -----                   -----        -----
 Total Fund Operating        0.44%               0.80%                   0.86%        0.54%
  Expenses..............     =====               =====                   =====        =====
</TABLE>    
- --------
   
(a) Class A shares are sold to a limited group of investors including existing
    Class A shareholders and certain investment programs. See "Purchase of
    Shares--Initial Sales Charge Alternatives--Class A and Class D Shares"--
    page 33.     
   
(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 36.     
          
(c) Reduced for purchases of $100,000 and over. Class A or Class D purchases
    of $100,000 or more may not be subject to an initial sales charge. See
    "Purchases of Shares--Initial Sales Charge Alternatives--Class A and Class
    D Shares"--page 33.     
   
(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 which
    are not subject to an initial sales charge may instead be subject to a
    CDSC of .20% of amounts redeemed within the first year after purchase.
        
          
(e) See "Investment Adviser"--page 28.     
   
(f) See "Purchase of Shares--Distribution Plans"--page 40.     
   
(g) Distribution Fees reflect the maximum amount the Portfolio would
    contractually be subject to pay. The actual amount incurred could be less
    if prescribed limitations are met.     
   
(h) See "Investment Adviser--Transfer Agency Services"--page 29.     
   
 * Class C shares of the Limited Maturity Portfolio are available only through
   the Exchange Privilege. See page 49.     
 
                                       6
<PAGE>
 
                           
                        LIMITED MATURITY PORTFOLIO     
 
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
 $10 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 6, (2) a
 5% annual return throughout the
 periods and (3) redemption at
 the end of the period:
  Class A........................  $       14 $       24 $       34 $        65
  Class B........................  $       18 $       26 $       44 $        99
  Class C*.......................  $       19 $       27 $       48 $       106
  Class D........................  $       15 $       27 $       40 $        77
An investor would pay the
 following expenses on the same
 $1,000 investment assuming no
 redemption at the end of the
 period:
  Class A........................  $       14 $       24 $       34 $        65
  Class B........................  $        8 $       26 $       44 $        99
  Class C*.......................  $        9 $       27 $       48 $       106
  Class D........................  $       15 $       27 $       40 $        77
</TABLE>    
- --------
 * Class C shares of the Limited Maturity Portfolio are available only through
   the Exchange Privilege.
       
  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
Securities and Exchange Commission regulations. THE EXAMPLE SHOULD NOT BE
CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES OR ANNUAL RATES OF
RETURN, AND ACTUAL EXPENSES OR ANNUAL RATES OF RETURN MAY BE MORE OR LESS THAN
THOSE ASSUMED FOR PURPOSES OF THE EXAMPLE. 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
charges permitted under the Rules of Fair Practice of the National Association
of Securities Dealers, Inc. ("NASD"). Merrill Lynch may charge its customers a
processing fee (presently $4.85) for confirming purchases and redemptions.
Purchases and redemptions directly through the Fund's transfer agent are not
subject to the processing fee. See "Purchase of Shares" and "Redemption of
Shares."
 
                                       7
<PAGE>
 
                     MERRILL LYNCH SELECT PRICINGSM SYSTEM
   
  Each Portfolio of the Fund offers four classes of shares under the Merrill
Lynch Select PricingSM 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 for the Insured and National Portfolios
only Class C are sold to investors choosing the deferred sales charge
alternatives. Class C shares of the Limited Maturity Portfolio are offered only
through the exchange privilege and may not be purchased except through exchange
of Class C shares of another Portfolio or another Fund. The Merrill Lynch
Select PricingSM System is used by more than 50 registered investment companies
advised by Merrill Lynch Asset Management, L.P. ("MLAM") or its affiliate, Fund
Asset Management, L.P. ("FAM" or the "Investment Adviser"). Funds advised by
MLAM or FAM are referred to herein as "MLAM-advised mutual funds."     
 
  Each Class A, Class B, Class C or Class D share of one of the Fund's
Portfolios represents an identical interest in the investment portfolio of the
applicable Portfolio 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 deferred sales charges and account
maintenance fees that are imposed on Class B and Class C shares of a Portfolio,
as well as the account maintenance fees that are imposed on the Class D shares,
will be imposed directly against those classes and not against all assets of
the relevant Portfolio 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 a Portfolio 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 deferred sales charges with respect to the Class B and Class C
shares in that the sales charges 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 PricingSM 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 PricingSM 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."
 
                                       8
<PAGE>
 
                        INSURED AND NATIONAL PORTFOLIOS
 
 
<TABLE>   
<CAPTION>
                                       ACCOUNT
                                     MAINTENANCE DISTRIBUTION       CONVERSION
 CLASS       SALES CHARGE (1)            FEE         FEE             FEATURE
- ------------------------------------------------------------------------------------
<S>    <C>                           <C>         <C>          <C>
  A        Maximum 4.00% initial         No           No                No
          sales charge (/2/)(/3/)
- ------------------------------------------------------------------------------------
  B    CDSC for a period of 4 years,    0.25%        0.50%     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%                                      ten years (/4/)
- ------------------------------------------------------------------------------------
  C       1.0% CDSC for one year        0.25%        0.55%              No
         decreasing to 0.0% after
              the first year
- ------------------------------------------------------------------------------------
  D        Maximum 4.00% initial        0.25%         No                No
               sales charge (/3/)
</TABLE>    
 
                          LIMITED MATURITY PORTFOLIO
 
 
<TABLE>   
<CAPTION>
                                    ACCOUNT
                                  MAINTENANCE DISTRIBUTION       CONVERSION
 CLASS      SALES CHARGE (1)          FEE         FEE             FEATURE
- ---------------------------------------------------------------------------------
<S>     <C>                       <C>         <C>          <C>
  A      Maximum 1.00% initial        No           No                No
             sales charge (/2/)(/3/)
- ---------------------------------------------------------------------------------
  B      CDSC at a rate of 1.0%      0.15%        0.20%     B shares convert to
         during the first year,                            D shares automatically
        decreasing to 0.0% after                            after approximately
             the first year                                      ten years (/4/)
- ---------------------------------------------------------------------------------
C(/5/)   1.0% CDSC for one year      0.15%        0.20%              No
        decreasing to 0.0% after
             the first year
- ---------------------------------------------------------------------------------
  D      Maximum 1.00% 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. Contingent deferred sales charges ("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 for the Insured and National
    Portfolios and $100,000 or more for the Limited Maturity Portfolio. 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 for the
    Insured and National Portfolios and a .20% CDSC for the Limited Maturity
    Portfolio, for one year. See "Class A" and "Class D" below.     
   
(4) The conversion period for dividend reinvestment shares is 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.     
   
(5) Class C shares of the Limited Maturity Portfolio are available only
    through the Exchange Privilege. See p. 49.     
 
                                       9
<PAGE>
 
   
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 a Portfolio in a
         shareholder account are entitled to purchase additional Class A shares
         of that Portfolio in that account. Other eligible investors include
         participants in certain investment programs. In addition, Class A
         shares will be offered to Merrill Lynch & Co., Inc. and its
         subsidiaries (including MLAM) (the term "subsidiaries," when used
         herein with respect to Merrill Lynch & Co., Inc., includes MLAM, FAM
         and certain other entities indirectly by wholly-owned and controlled
         by Merrill Lynch & Co., Inc.) and their directors and employees and to
         members of the Boards of MLAM-advised mutual funds. The maximum
         initial sales charge is 4.00% for the Insured and National Portfolios
         and 1.00% for the Limited Maturity Portfolio and is reduced for
         purchases of $25,000 and over for the Insured and National Portfolios
         and for purchases of $100,000 or over for the Limited Maturity
         Portfolio. Purchases of $1,000,000 or more may not be subject to an
         initial sales charge but such purchases may be subject to a CDSC of
         1.0% (for the Insured and National Portfolios) or .20% (for the
         Limited Maturity Portfolio) if the shares are redeemed within one year
         after purchase. Sales charges also are reduced under a right of
         accumulation which takes into account the investors's 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%
         (in the case of the Insured Portfolio and the National Portfolio) and
         0.15% (in the case of the Limited Maturity Portfolio) of the
         Portfolio's average net assets attributable to the Class B shares, an
         ongoing distribution fee of 0.50% (in the case of the Insured
         Portfolio and the National Portfolio) and 0.20% (in the case of the
         Limited Maturity Portfolio) of the Portfolio's average net assets
         attributable to Class B shares and a CDSC if they are redeemed within
         four years of purchase (in the case of the Insured Portfolio and
         National Portfolio) and within one year of purchase (in the case of
         the Limited Maturity Portfolio). Approximately ten years after
         issuance, Class B shares of the Portfolio will convert automatically
         into Class D shares of the Portfolio, which are subject to an account
         maintenance fee but 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 a Portfolio 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. Automatic conversion of
         Class B shares into Class D shares will occur at least once a 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."
 
 
                                       10
<PAGE>
 
   
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%
         (in the case of the Insured Portfolio and the National Portfolio) and
         0.15% (in the case of the Limited Maturity Portfolio) of average net
         assets and an ongoing distribution fee of 0.55% (in the case of the
         Insured Portfolio and the National Portfolio) and 0.20% (in the case
         of the Limited Maturity Portfolio) of average net assets. Class C
         shares are also subject to a CDSC if they are redeemed within one year
         of purchase. Although Class C shares are subject to a 1.0% CDSC for
         only one year (as compared to four years for Class B of the Insured
         Portfolio and National Portfolio), 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 Fund's Board of Directors and
         regulatory limitations. Class C shares of the Limited Maturity
         Portfolio are available only through the Exchange Privilege. See p.
         49.     
   
Class D: Class D shares incur an initial sales charge when they are purchased
         and are subject to an ongoing account maintenance fee of 0.25% (in the
         case of the Insured Portfolio and the National Portfolio) and 0.10%
         (in the case of the Limited Maturity Portfolio) of average net assets.
         Class D shares are not subject to an ongoing distribution fee or any
         CDSC when they are redeemed. Purchases of $1,000,000 or more may not
         be subject to an initial sales charge but such purchase may be subject
         to a CDSC of 1.0% (for the Insured and National Portfolios) or .20%
         (for the Limited Maturity Portfolio) if the shares are redeemed within
         one year after purchase. The schedule of initial sales charges and
         reductions for Class D shares is the same as the schedule for Class A
         shares. 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."     
 
  The following is a discussion of the factors that investors should consider
in determining the method of purchasing shares under the Merrill Lynch Select
PricingSM 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 of the account maintenance fee
imposed on Class D shares. Investors qualifying for significantly reduced
initial sales charges may find the initial sales charge alternative
particularly attractive because similar sales charge reductions are not
available with respect to the deferred sales charges imposed in connection with
purchases of Class B or Class C shares. Investors not qualifying for reduced
initial sales charges who expect to maintain their investment for an extended
period of time also may elect to purchase Class A or Class D shares, because
over time the accumulated ongoing account maintenance and distribution fees on
Class B or Class C shares may exceed the initial sales charge and, in the case
of Class D shares, the account maintenance fee. Although some investors who
previously purchased Class A shares may no longer be eligible to purchase Class
A shares of other 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 which 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     
 
                                       11
<PAGE>
 
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 of a Portfolio will be converted
into Class D shares of that Portfolio 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 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."
 
 
                                       12
<PAGE>
 
                              FINANCIAL HIGHLIGHTS
   
  The financial information in the table below in connection with shares of the
Insured Portfolio, National Portfolio and the Limited Maturity Portfolio has
been audited in conjunction with the annual audits of the financial statements
of the Portfolios by Deloitte & Touche LLP, independent auditors. Financial
statements for the year ended June 30, 1996 and the independent auditors'
report thereon are included in the Statement of Additional Information. 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 Fund at the telephone number or address on the front
cover of this Prospectus.     
 
<TABLE>   
<CAPTION>
THE FOLLOWING
PER SHARE DATA
AND RATIOS HAVE                                                 INSURED PORTFOLIO
BEEN DERIVED      ------------------------------------------------------------------------------------------------------------------
FROM INFORMATION                                                     CLASS A
PROVIDED IN THE   ------------------------------------------------------------------------------------------------------------------
FINANCIAL                                                  FOR THE YEAR ENDED JUNE 30,
STATEMENTS:       ------------------------------------------------------------------------------------------------------------------
Increase
(Decrease) in        1996        1995        1994        1993        1992        1991        1990        1989        1988    
Net Asset Value:  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ---------- 
<S>               <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>        
PER SHARE                                                                                                                    
OPERATING                                                                                                                    
PERFORMANCE:                                                                                                                 
Net asset value,                                                                                                             
beginning of                                                                                                                 
year............  $     7.92  $     7.88  $     8.64  $     8.26  $     7.92  $     7.86  $     7.97  $     7.69  $     7.79 
                  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ---------- 
Investment                                                                                                                   
income--net.....         .44         .46         .47         .50         .52         .54         .55         .58         .57 
Realized and                                                                                                                 
unrealized gain                                                                                                              
(loss) on                                                                                                                    
investments--                                                                                                                
net.............        (.01)        .18        (.53)        .49         .41         .12        (.11)        .28         .00 
                  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ---------- 
Total from                                                                                                                   
investment                                                                                                                   
operations......         .43         .64        (.06)        .99         .93         .66         .44         .86         .57 
                  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ---------- 
Less dividends                                                                                                               
and                                                                                                                          
distributions:                                                                                                               
 Investment                                                                                                                  
 income--net....        (.44)       (.46)       (.47)       (.50)       (.52)       (.54)       (.55)       (.58)       (.57)
 Realized gain                                                                                                               
 on                                                                                                                          
 investments--                                                                                                               
 net............         --         (.14)       (.23)       (.11)       (.07)       (.06)        --          --         (.10)
                  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ---------- 
Total dividends                                                                                                              
and                                                                                                                          
distributions...        (.44)       (.60)       (.70)       (.61)       (.59)       (.60)       (.55)       (.58)       (.67)
                  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ---------- 
Net asset value,                                                                                                             
end of year.....  $     7.91  $     7.92  $     7.88  $     8.64  $     8.26  $     7.92  $     7.86  $     7.97  $     7.69 
                  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ========== 
TOTAL INVESTMENT                                                                                                             
RETURN:*                                                                                                                     
Based on net                                                                                                                 
asset value per                                                                                                              
share...........        5.51%       8.60%     (1.08%)      12.41%      12.11%       8.84%       5.76%      11.62%       7.75%
                  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ========== 
RATIOS TO                                                                                                                    
AVERAGE NET                                                                                                                  
ASSETS:                                                                                                                      
Expenses........         .43%        .43%        .42%        .42%        .44%        .45%        .46%        .49%        .52%
                  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ========== 
Investment                                                                                                                   
income--net.....        5.55%       5.78%       5.53%       5.94%       6.44%       6.90%       7.03%       7.46%       7.55%
                  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ========== 
SUPPLEMENTAL                                                                                                                 
DATA:                                                                                                                        
Net assets, end                                                                                                              
of year (in                                                                                                                  
thousands)......  $1,572,835  $1,706,064  $1,941,741  $2,225,188  $2,062,591  $1,984,307  $2,019,166  $2,013,219  $1,982,997 
                  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ========== 
Portfolio                                                                                                                    
turnover........       78.49%      35.61%      28.34%      43.86%      22.50%      33.12%      23.20%      45.49%      33.98%
                  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ==========  ========== 
</TABLE>    

<TABLE>   
<CAPTION>
THE FOLLOWING
PER SHARE DATA
AND RATIOS HAVE                                                 INSURED PORTFOLIO
BEEN DERIVED      ------------------------------------------------------------------------------------------------------------------
FROM INFORMATION                                                     CLASS A
PROVIDED IN THE   ------------------------------------------------------------------------------------------------------------------
FINANCIAL                                                  FOR THE YEAR ENDED JUNE 30,
STATEMENTS:       ------------------------------------------------------------------------------------------------------------------
Increase
(Decrease) in        1987
Net Asset Value:  ----------
<S>               <C>
PER SHARE         
OPERATING         
PERFORMANCE:      
Net asset value,  
beginning of      
year............  $     7.84
                  ----------
Investment        
income--net.....         .60
Realized and      
unrealized gain   
(loss) on         
investments--     
net.............        (.04)
                  ----------
Total from        
investment        
operations......         .56
                  ----------
Less dividends    
and               
distributions:    
 Investment       
 income--net....        (.60)
 Realized gain    
 on               
 investments--    
 net............        (.01)
                  ----------
Total dividends   
and               
distributions...        (.61)
                  ----------
Net asset value,  
end of year.....  $     7.79
                  ==========
TOTAL INVESTMENT  
RETURN:*          
Based on net      
asset value per   
share...........        6.94%
                  ==========
RATIOS TO         
AVERAGE NET       
ASSETS:           
Expenses........         .57%
                  ==========
Investment        
income--net.....        7.21%
                  ==========
SUPPLEMENTAL      
DATA:             
Net assets, end   
of year (in       
thousands)......  $2,238,480
                  ==========
Portfolio         
turnover........       63.55%
                  ==========
</TABLE>    

- ----
* Total investment returns exclude the effects of sales loads.
 
 
                                       13
<PAGE>
 
<TABLE>   
<CAPTION>
THE FOLLOWING
PER SHARE DATA                                                                                                                     
AND RATIOS HAVE                                                             INSURED PORTFOLIO                                      
BEEN DERIVED      -----------------------------------------------------------------------------------------------------------------
FROM INFORMATION                                     CLASS B                                                      CLASS C          
PROVIDED IN THE   ------------------------------------------------------------------------------------- ---------------------------
FINANCIAL                          FOR THE YEAR ENDED JUNE 30,                           FOR THE PERIOD FOR THE YEAR FOR THE PERIOD
STATEMENTS:       ---------------------------------------------------------------------  OCT. 21 1988+     ENDED     OCT. 21, 1994+
Increase                                                                                  TO JUNE 30,     JUNE 30,    TO JUNE 30,  
(Decrease) in       1996      1995      1994       1993      1992      1991      1990         1989          1996          1995     
Net Asset Value:  --------  --------  --------   --------  --------  --------  --------  -------------- ------------ --------------
<S>               <C>       <C>       <C>        <C>       <C>       <C>       <C>       <C>            <C>          <C>           
PER SHARE                                                                                                                          
 OPERATING                                                                                                                         
 PERFORMANCE:                                                                                                                      
Net asset value,                                                                                                                   
 beginning of                                                                                                                      
 period.........  $   7.92  $   7.87  $   8.63   $   8.26  $   7.92  $   7.86  $   7.97     $   7.81      $  7.92        $ 7.68    
                  --------  --------  --------   --------  --------  --------  --------     --------      -------        ------    
Investment                                                                                                                         
 income-net.....       .38       .40       .40        .44       .46       .48       .49          .36          .38           .27    
Realized and                                                                                                                       
 unrealized gain                                                                                                                   
 (loss) on                                                                                                                         
 investments--                                                                                                                     
 net............      (.01)      .19      (.53)       .48       .41       .12      (.11)         .16         (.01)          .38    
                  --------  --------  --------   --------  --------  --------  --------     --------      -------        ------    
Total from                                                                                                                         
 investment                                                                                                                        
 operations.....       .37       .59      (.13)       .92       .87       .60       .38          .52          .37           .65    
                  --------  --------  --------   --------  --------  --------  --------     --------      -------        ------    
Less dividends
 and
 distributions:
 Investment
  income--net...      (.38)     (.40)     (.40)      (.44)     (.46)     (.48)     (.49)        (.36)        (.38)         (.27)   
 Realized gain                                                                                                                     
  on                                                                                                                               
  investments--                                                                                                                    
  net...........       --       (.14)     (.23)      (.11)     (.07)     (.06)      --           --           --           (.14)   
                  --------  --------  --------   --------  --------  --------  --------     --------      -------        ------    
Total dividends                                                                                                                    
 and                                                                                                                               
 distributions..      (.38)     (.54)     (.63)      (.55)     (.53)     (.54)     (.49)        (.36)        (.38)         (.41)   
                  --------  --------  --------   --------  --------  --------  --------     --------      -------        ------    
Net asset value,                                                                                                                   
 end of period..  $   7.91  $   7.92  $   7.87   $   8.63  $   8.26  $   7.92  $   7.86     $   7.97      $  7.91        $ 7.92    
                  ========  ========  ========   ========  ========  ========  ========     ========      =======        ======    
TOTAL INVESTMENT
 RETURN:**
Based on net
 asset value per
 share..........      4.71%     7.91%    (1.81%)    11.44%    11.27%     8.02%     4.98%        6.88%#       4.65%         8.83%#  
                  ========  ========  ========   ========  ========  ========  ========     ========      =======        ======    
RATIOS TO                                                                                                                          
 AVERAGE NET                                                                                                                       
 ASSETS:                                                                                                                           
Expenses........      1.19%     1.19%     1.17%      1.18%     1.19%     1.20%     1.22%        1.23%*       1.24%         1.23%*  *
                  ========  ========  ========   ========  ========  ========  ========     ========      =======        ======    
Investment                                                                                                                         
 income--net....      4.80%     5.03%     4.78%      5.17%     5.69%     6.13%     6.27%        6.58%*       4.75%         4.93%*  *
                  ========  ========  ========   ========  ========  ========  ========     ========      =======        ======    
SUPPLEMENTAL                                                                                                                       
 DATA:                                                                                                                             
Net assets, end                                                                                                                    
 of period (in                                                                                                                     
 thousands).....  $723,090  $782,748  $866,193   $911,307  $706,016  $537,755  $408,641     $175,707      $18,936        $7,756    
                  ========  ========  ========   ========  ========  ========  ========     ========      =======        ======    
Portfolio                                                                                                                          
 turnover.......     78.49%    35.61%    28.34%     43.86%    22.50%    33.12%    23.20%       45.49%       78.49%        35.61%   
                  ========  ========  ========   ========  ========  ========  ========     ========      =======        ======    
</TABLE>    

<TABLE>   
<CAPTION>
THE FOLLOWING
PER SHARE DATA
AND RATIOS HAVE                                                             INSURED PORTFOLIO
BEEN DERIVED      --------------------------------------------------------------------------------------------------------------
FROM INFORMATION          CLASS D
PROVIDED IN THE   ---------------------------
FINANCIAL         FOR THE YEAR FOR THE PERIOD
STATEMENTS:          ENDED     OCT. 21, 1994+
Increase            JUNE 30,    TO JUNE 30,
(Decrease) in         1996          1995 
Net Asset Value:  ------------ --------------
<S>               <C>          <C>       
PER SHARE                                
 OPERATING                               
 PERFORMANCE:                            
Net asset value,                         
 beginning of                            
 period.........    $  7.92       $  7.68
                    -------       -------
Investment                               
 income-net.....        .42           .29
Realized and                             
 unrealized gain                         
 (loss) on                               
 investments--                           
 net............       (.01)          .38
                    -------       -------
Total from                               
 investment                              
 operations.....        .41           .67
                    -------       -------
Less dividends                           
 and                                     
 distributions:                          
 Investment                              
  income--net...       (.42)         (.29)
 Realized gain                           
  on                                     
  investments--                          
  net...........        --           (.14)
                    -------       -------
Total dividends                          
 and                                     
 distributions..       (.42)         (.43)
                    -------       -------
Net asset value,                         
 end of period..    $  7.91       $  7.92
                    =======       =======
TOTAL INVESTMENT                         
 RETURN:**                               
Based on net                             
 asset value per                         
 share..........       5.25%         9.24%#
                    =======       =======
RATIOS TO                                
 AVERAGE NET                             
 ASSETS:                                 
Expenses........        .68%          .68%*
                    =======       =======
Investment                               
 income--net....       5.31%         5.50%*
                    =======       =======
SUPPLEMENTAL                             
 DATA:                                   
Net assets, end                          
 of period (in                           
 thousands).....    $51,772       $26,015
                    =======       =======
Portfolio                                
 turnover.......      78.49%        35.61%
                    =======       ======= 
</TABLE>      
- -------
 * Annualized.
** Total investment returns exclude the effects of sales loads.
 + Commencement of Operations.
# Aggregate total investment return.
 
                                       14
<PAGE>
 
<TABLE>   
<CAPTION>
THE FOLLOWING
PER SHARE DATA
AND RATIOS HAVE                                               NATIONAL PORTFOLIO
BEEN DERIVED      ------------------------------------------------------------------------------------------------------------------
FROM INFORMATION                                                    CLASS A
PROVIDED IN THE   ------------------------------------------------------------------------------------------------------------------
FINANCIAL                                                 FOR THE YEAR ENDED JUNE 30,
STATEMENTS:       ------------------------------------------------------------------------------------------------------------------
Increase
(Decrease) in       1996       1995        1994         1993        1992        1991       19990        1989        1988     
Net Asset Value:  --------  ----------  ----------   ----------  ----------  ----------  ----------  ----------  ----------  
<S>               <C>       <C>         <C>          <C>         <C>         <C>         <C>         <C>         <C>         
PER SHARE                                                                                                                    
 OPERATING                                                                                                                   
 PERFORMANCE:                                                                                                                
Net asset value,                                                                                                             
 beginning of                                                                                                                
 year...........  $  10.02  $    10.08  $    11.02   $    10.64  $    10.17  $    10.12  $    10.31  $     9.94  $    10.12  
                  --------  ----------  ----------   ----------  ----------  ----------  ----------  ----------  ----------  
Investment                                                                                                                   
 income--net....       .60         .60         .62          .67         .71         .73         .74         .77         .76  
Realized and                                                                                                                 
 unrealized                                                                                                                  
 gain(loss) on                                                                                                               
 investments--                                                                                                               
 net............       .09         .15        (.64)         .57         .58         .05        (.19)        .37        (.11) 
                  --------  ----------  ----------   ----------  ----------  ----------  ----------  ----------  ----------  
Total from                                                                                                                   
 investment                                                                                                                  
 operations.....       .69         .75        (.02)        1.24        1.29         .78         .55        1.14         .65  
                  --------  ----------  ----------   ----------  ----------  ----------  ----------  ----------  ----------  
Less dividends                                                                                                               
 and                                                                                                                         
 distributions:                                                                                                              
 Investment                                                                                                                  
  income--net...      (.60)       (.60)       (.62)        (.67)       (.71)       (.73)       (.74)       (.77)       (.76) 
 Realized gain                                                                                                               
  on                                                                                                                         
  investments--                                                                                                              
  net...........       --         (.19)       (.30)        (.19)       (.11)        --          --          --         (.07) 
 In excess of                                                                                                                
  realized gain                                                                                                              
  on                                                                                                                         
  investments--                                                                                                              
  net...........       --         (.02)        --           --          --          --          --          --          --   
                  --------  ----------  ----------   ----------  ----------  ----------  ----------  ----------  ----------  
Total dividends                                                                                                              
 and                                                                                                                         
 distributions..      (.60)       (.81)       (.92)        (.86)       (.82)       (.73)       (.74)       (.77)       (.83) 
                  --------  ----------  ----------   ----------  ----------  ----------  ----------  ----------  ----------  
Net asset value,                                                                                                             
 end of year....  $  10.11  $    10.02  $    10.08   $    11.02  $    10.64  $    10.17  $    10.12  $    10.31  $     9.94  
                  ========  ==========  ==========   ==========  ==========  ==========  ==========  ==========  ==========  
TOTAL INVESTMENT                                                                                                             
 RETURN:*                                                                                                                    
Based on net                                                                                                                 
 asset value per                                                                                                             
 share..........      6.98%       7.89%       (.47%)      12.19%      13.09%       7.94%       5.53%      11.89%       6.89% 
                  ========  ==========  ==========   ==========  ==========  ==========  ==========  ==========  ==========  
RATIOS TO                                                                                                                    
 AVERAGE NET                                                                                                                 
 ASSETS:                                                                                                                     
Expenses........       .56%        .56%        .55%         .55%        .55%        .55%        .55%        .55%        .55% 
                  ========  ==========  ==========   ==========  ==========  ==========  ==========  ==========  ==========  
Investment                                                                                                                   
 income-net.....      5.89%       6.01%       5.72%        6.23%       6.80%       7.20%       7.27%       7.63%       7.79% 
                  ========  ==========  ==========   ==========  ==========  ==========  ==========  ==========  ==========  
SUPPLEMENTAL                                                                                                                 
 DATA:                                                                                                                       
Net assets, end                                                                                                              
 of period (in                                                                                                               
 thousands).....  $983,550  $1,059,440  $1,203,181   $1,353,805  $1,278,055  $1,255,820  $1,365,541  $1,445,116  $1,467,982  
                  ========  ==========  ==========   ==========  ==========  ==========  ==========  ==========  ==========  
Portfolio                                                                                                                    
 turnover.......     95.09%     103.65%      73.33%       65.43%      50.94%      75.25%      48.80%      76.73%      72.77% 
                  ========  ==========  ==========   ==========  ==========  ==========  ==========  ==========  ==========  
</TABLE> 

- -------
     
    
<TABLE>
<CAPTION>
THE FOLLOWING
PER SHARE DATA
AND RATIOS HAVE                                               NATIONAL PORTFOLIO
BEEN DERIVED      ------------------------------------------------------------------------------------------------------------------
FROM INFORMATION                                                    CLASS A
PROVIDED IN THE   ------------------------------------------------------------------------------------------------------------------
FINANCIAL                                                 FOR THE YEAR ENDED JUNE 30,
STATEMENTS:       ------------------------------------------------------------------------------------------------------------------
Increase
(Decrease) in       1987
Net Asset Value: ----------
<S>              <C>
PER SHARE        
 OPERATING       
 PERFORMANCE:    
Net asset value, 
 beginning of    
 year........... $    10.28
                 ----------
Investment       
 income--net....        .80
Realized and     
 unrealized      
 gain(loss) on   
 investments--   
 net............        .02
                 ----------
Total from       
 investment      
 operations.....        .82
                 ----------
Less dividends   
 and             
 distributions:  
 Investment      
  income--net...       (.80)
 Realized gain   
  on             
  investments--  
  net...........       (.18)
 In excess of    
  realized gain  
  on             
  investments--  
  net...........        --
                 ----------
Total dividends  
 and             
 distributions..       (.98)
                 ----------
Net asset value, 
 end of year.... $    10.12
                 ==========
TOTAL INVESTMENT 
 RETURN:*        
Based on net     
 asset value per 
 share..........       7.99%
                 ==========
RATIOS TO        
 AVERAGE NET     
 ASSETS:         
Expenses........        .55%
                 ==========
Investment       
 income-net.....       7.56%
                 ==========
SUPPLEMENTAL     
 DATA:           
Net assets, end  
 of period (in   
 thousands)..... $1,506,369
                 ==========
Portfolio        
 turnover.......      72.44%
                 ==========
</TABLE> 
     

   
 * Total investment returns exclude the effects of sales loads.     
       
                                       15
<PAGE>
 
<TABLE>   
<CAPTION>
THE FOLLOWING
PER SHARE DATA
AND RATIOS HAVE                                                          NATIONAL PORTFOLIO
BEEN DERIVED      ---------------------------------------------------------------------------------------------------------------
FROM INFORMATION                                     CLASS B                                                     CLASS C         
PROVIDED IN THE   ------------------------------------------------------------------------------------- -------------------------
FINANCIAL                          FOR THE YEAR ENDED JUNE 30,                           FOR THE PERIOD  FOR THE   FOR THE PERIOD
STATEMENTS:       ---------------------------------------------------------------------  OCT. 21 1988+  YEAR ENDED OCT. 21, 1994+
Increase                                                                                  TO JUNE 30,    JUNE 30,   TO JUNE 30,  
(Decrease) in       1996      1995      1994       1993      1992      1991      1990         1989         1996         1995     
Net Asset Value:  --------  --------  --------   --------  --------  --------  --------  -------------- ---------- --------------
<S>               <C>       <C>       <C>        <C>       <C>       <C>       <C>       <C>            <C>        <C>           
PER SHARE                                                                                                                        
 OPERATING                                                                                                                       
 PERFORMANCE:                                                                                                                    
Net asset value,                                                                                                                 
 beginning of                                                                                                                    
 period.........  $  10.02  $  10.07  $  11.02   $  10.63  $  10.16  $  10.11  $  10.30     $ 10.14      $ 10.03       $ 9.85    
                  --------  --------  --------   --------  --------  --------  --------     -------      -------       ------    
Investment                                                                                                                       
 income--net....       .52       .52       .54        .59       .63       .65       .66         .48          .52          .36    
Realized and                                                                                                                     
 unrealized gain                                                                                                                 
 (loss) on                                                                                                                       
 investments--                                                                                                                   
 net............       .09       .16      (.65)       .58       .58       .05      (.19)        .16          .08          .39    
                  --------  --------  --------   --------  --------  --------  --------     -------      -------       ------    
Total from                                                                                                                       
 investment                                                                                                                      
 operations.....       .61       .68      (.11)      1.17      1.21       .70       .47         .64          .60          .75    
                  --------  --------  --------   --------  --------  --------  --------     -------      -------       ------    
Less dividends                                                                                                                   
 and                                                                                                                             
 distributions:                                                                                                                  
 Investment                                                                                                                      
  income--net...      (.52)     (.52)     (.54)      (.59)     (.63)     (.65)     (.66)       (.48)        (.52)        (.36)   
 Realized gain                                                                                                                   
  on                                                                                                                             
  investments--                                                                                                                  
  net...........       --       (.19)     (.30)      (.19)     (.11)      --        --          --           --          (.19)   
 In excess of                                                                                                                    
  realized gain                                                                                                                  
  on                                                                                                                             
  investments--                                                                                                                  
  net...........       --       (.02)      --         --        --        --        --          --           --          (.02)   
                  --------  --------  --------   --------  --------  --------  --------     -------      -------       ------    
Total dividends                                                                                                                  
 and                                                                                                                             
 distributions..      (.52)     (.73)     (.84)      (.78)     (.74)     (.65)     (.66)       (.48)        (.52)        (.57)   
                  --------  --------  --------   --------  --------  --------  --------     -------      -------       ------    
Net asset value,                                                                                                                 
 end of period..  $  10.11  $  10.02  $  10.07   $  11.02  $  10.63  $  10.16  $  10.11     $ 10.30      $ 10.11       $10.03    
                  ========  ========  ========   ========  ========  ========  ========     =======      =======       ======    
TOTAL INVESTMENT                                                                                                                 
 RETURN:**                                                                                                                       
Based on net                                                                                                                     
 asset value per                                                                                                                 
 share..........      6.17%     7.28%    (1.39%)    11.45%    12.25%     7.14%     4.74%       6.48%#       6.01%        7.97%#  
                  ========  ========  ========   ========  ========  ========  ========     =======      =======       ======    
RATIOS TO                                                                                                                        
 AVERAGE NET                                                                                                                     
 ASSETS:                                                                                                                         
Expenses........      1.32%     1.32%     1.30%      1.31%     1.31%     1.31%     1.31%       1.31%*       1.37%        1.37%*  
                  ========  ========  ========   ========  ========  ========  ========     =======      =======       ======    
Investment                                                                                                                       
 income-net.....      5.13%     5.25%     4.97%      5.46%     6.03%     6.43%     6.52%       6.74%*       5.08%        5.21%*  
                  ========  ========  ========   ========  ========  ========  ========     =======      =======       ======    
SUPPLEMENTAL                                                                                                                     
 DATA:                                                                                                                           
Net assets, end                                                                                                                  
 of period (in                                                                                                                   
 thousands).....  $399,341  $419,933  $459,169   $424,071  $286,375  $213,581  $179,362     $97,196      $13,291       $5,195    
                  ========  ========  ========   ========  ========  ========  ========     =======      =======       ======    
Portfolio                                                                                                                        
 turnover.......     95.09%   103.65%    73.33%     65.43%    50.94%    75.25%    48.80%      76.73%       95.09%      103.65%   
                  ========  ========  ========   ========  ========  ========  ========     =======      =======       ======    
</TABLE>    

<TABLE>   
<CAPTION>
THE FOLLOWING
PER SHARE DATA
AND RATIOS HAVE                                                          NATIONAL PORTFOLIO
BEEN DERIVED     -------------------------------------------------------------------------------------------------------------------
FROM INFORMATION         CLASS D
PROVIDED IN THE  ------------------------
FINANCIAL        FOR THE   FOR THE PERIOD
STATEMENTS:      EAR ENDED OCT. 21, 1994+
Increase         JUNE 30,   TO JUNE 30,
(Decrease) in      1996         1995
Net Asset Value: --------- --------------
<S>              <C>        <C>
PER SHARE        
 OPERATING       
 PERFORMANCE:    
Net asset value, 
 beginning of    
 period......... $ 10.03      $  9.85
                 -------      -------
Investment       
 income--net....     .57          .40
Realized and     
 unrealized gain 
 (loss) on       
 investments--   
 net............     .09          .39
                 -------      -------
Total from       
 investment      
 operations.....     .66          .79
                 -------      -------
Less dividends   
 and                                                                                                                             
 distributions:  
 Investment      
  income--net...    (.57)        (.40)
 Realized gain   
  on             
  investments--  
  net...........     --          (.19)
 In excess of    
  realized gain  
  on             
  investments--  
  net...........     --          (.02)
                 -------      -------
Total dividends  
 and             
 distributions..    (.57)        (.61)
                 -------      -------
Net asset value, 
 end of period.. $ 10.12      $ 10.03
                 =======      =======
TOTAL INVESTMENT 
 RETURN:**       
Based on net     
 asset value per 
 share..........    6.71%        8.37%#
                 =======      =======
RATIOS TO        
 AVERAGE NET     
 ASSETS:         
Expenses........     .81%         .81%*
                 =======      =======
Investment       
 income-net.....    5.64%        5.78%*
                 =======      =======
SUPPLEMENTAL     
 DATA:           
Net assets, end  
 of period (in   
 thousands)..... $43,884      $19,656
                 =======      =======
Portfolio        
 turnover.......   95.09%      103.65%
                 =======      =======
</TABLE>    


- -------
 * Annualized.
** Total investment returns exclude the effects of sales loads.
 + Commencement of operations.
# Aggregate total investment return.
 
                                       16
<PAGE>
 
<TABLE>   
<CAPTION>
                                                          LIMITED MATURITY PORTFOLIO
THE FOLLOWING PER SHARE    --------------------------------------------------------------------------------------------------
DATA AND RATIOS HAVE BEEN                                           CLASS A
DERIVED FROM INFORMATION   --------------------------------------------------------------------------------------------------
PROVIDED IN THE FINANCIAL                                 FOR THE YEAR ENDED JUNE 30,
STATEMENTS:                --------------------------------------------------------------------------------------------------
Increase (Decrease) in       1996      1995      1994      1993      1992      1991      1990      1989      1988      1987
Net Asset Value:           --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
<S>                        <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING
 PERFORMANCE:
Net asset value, begin-
 ning of year...........   $   9.92  $   9.87  $  10.01  $   9.91  $   9.75  $   9.71  $   9.73  $   9.75  $   9.83  $   9.87
                           --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Investment income--net..        .38       .38       .37       .41       .50       .57       .60       .58       .53       .52
Realized and unrealized
 gain (loss) on
 investments--net.......       (.01)      .05      (.14)      .10       .16       .04      (.02)     (.02)     (.07)     (.04)
                           --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Total from investment
 operations.............        .37       .43       .23       .51       .66       .61       .58       .56       .46       .48
                           --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Less dividends and dis-
 tributions:
 Investment income--net.       (.38)     (.38)     (.37)     (.41)     (.50)     (.57)     (.60)     (.58)     (.53)     (.52)
 Realized gain on in-
  vestments--
  net...................        --        --        --        --        --        --        --        --       (.01)      --
                           --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Total dividends and dis-
 tributions:                   (.38)     (.38)     (.37)     (.41)     (.50)     (.57)     (.60)     (.58)     (.54)     (.52)
                           --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Net asset value, end of
 year...................   $   9.91  $   9.92  $   9.87  $  10.01  $   9.91  $   9.75  $   9.71  $   9.73  $   9.75  $   9.83
                           ========  ========  ========  ========  ========  ========  ========  ========  ========  ========
TOTAL INVESTMENT RE-
 TURN:*
Based on net asset value
 per share..............       3.75%     4.53%     2.30%     5.28%     6.93%     6.45%     6.16%     5.96%     4.83%     4.99%
                           ========  ========  ========  ========  ========  ========  ========  ========  ========  ========
RATIOS TO AVERAGE NET
 ASSETS:
Expenses................        .44%      .41%      .40%      .41%      .40%      .40%      .40%      .41%      .40%      .40%
                           ========  ========  ========  ========  ========  ========  ========  ========  ========  ========
Investment income--net..       3.83%     3.86%     3.68%     4.13%     5.02%     5.88%     6.21%     6.00%     5.42%     5.27%
                           ========  ========  ========  ========  ========  ========  ========  ========  ========  ========
SUPPLEMENTAL DATA:
Net assets, end of year
 (in thousands).........   $417,097  $536,474  $790,142  $846,736  $613,407  $350,549  $352,005  $385,794  $567,158  $792,229
                           ========  ========  ========  ========  ========  ========  ========  ========  ========  ========
Portfolio turnover......      88.32%    37.33%    45.67%    65.43%    96.32%    93.06%   106.44%   228.78%   146.01%    19.55%
                           ========  ========  ========  ========  ========  ========  ========  ========  ========  ========
</TABLE>    
- -------
* Total investment returns exclude the effects of sales loads.
 
                                       17
<PAGE>
 
<TABLE>   
<CAPTION>
                                                         LIMITED MATURITY PORTFOLIO
                          -----------------------------------------------------------------------------------------
                                       CLASS B                            CLASS C                  CLASS D
THE FOLLOWING PER SHARE   -------------------------------------   ------------------------ ------------------------
DATA AND RATIOS HAVE                                   FOR THE                   FOR THE                  FOR THE
BEEN DERIVED FROM                                       PERIOD                   PERIOD                   PERIOD
INFORMATION PROVIDED IN      FOR THE YEAR ENDED        NOV. 2,    FOR THE YEAR OCTOBER 21, FOR THE YEAR OCTOBER 21,
THE FINANCIAL                     JUNE 30,             1992+ TO      ENDED      1994+ TO      ENDED      1994+ TO
STATEMENTS:               ---------------------------  JUNE 30,     JUNE 30,    JUNE 30,     JUNE 30,    JUNE 30,
Increase (Decrease) in     1996      1995      1994      1993         1996        1995         1996        1995
Net Asset Value:          -------  --------  --------  --------   ------------ ----------- ------------ -----------
<S>                       <C>      <C>       <C>       <C>        <C>          <C>         <C>          <C>     
PER SHARE OPERATING PER-
FORMANCE:
Net asset value, begin-
ning of period..........  $  9.92  $   9.87  $  10.01  $  9.93       $ 9.92      $ 9.83      $  9.93      $  9.83
                          -------  --------  --------  -------       ------      ------      -------      -------
Investment income--net..      .35       .35       .33      .24          .34         .25          .37          .26
Realized and unrealized
gain (loss) on
investments--net........     (.01)      .05      (.14)     .08         (.04)        .09         (.02)         .10
                          -------  --------  --------  -------       ------      ------      -------      -------
Total from investment
operations..............      .34       .40       .19      .32          .30         .34          .35          .36
                          -------  --------  --------  -------       ------      ------      -------      -------
Less dividends from in-
vestment income--net....     (.35)     (.35)     (.33)    (.24)        (.34)       (.25)       (.37)        (.26)
                          -------  --------  --------  -------       ------      ------      -------      -------
Net asset value, end of
period..................  $  9.91  $   9.92  $   9.87  $ 10.01       $ 9.88      $ 9.92      $  9.91      $  9.93
                          =======  ========  ========  =======       ======      ======      =======      =======
TOTAL INVESTMENT RE-
TURN:**
Based on net asset value
per share...............     3.37%     4.14%     1.98%    3.26%#       2.97%       3.52%#       3.55%        3.73%#
                          =======  ========  ========  =======       ======      ======      =======      =======
RATIOS TO AVERAGE NET
ASSETS:
Expenses................      .80%      .78%      .76%     .76%*        .80%        .70%*        .54%         .53%*
                          =======  ========  ========  =======       ======      ======      =======      =======
Investment income--net..     3.46%     3.50%     3.33%    3.60%*       3.41%       3.61%*       3.71%        3.78%*
                          =======  ========  ========  =======       ======      ======      =======      =======
SUPPLEMENTAL DATA:
Net assets, end of pe-
riod (in thousands).....  $71,075  $129,581  $145,534  $95,179       $   94      $3,965      $15,886      $11,258
                          =======  ========  ========  =======       ======      ======      =======      =======
Portfolio turnover......    88.32%    37.33%    45.67%   65.43%       88.32%      37.33%       88.32%       37.33%
                          =======  ========  ========  =======       ======      ======      =======      =======
</TABLE>    
- ----
 * Annualized.
** Total investment returns exclude the effects of sales loads.
 + Commencement of Operations.
 # Aggregate total investment return.
 
  Further information about the Fund's performance is contained in the Fund's
Annual Report which may be obtained, without charge, upon request.
 
                                       18
<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 income taxes as is consistent with the
investment policies of each Portfolio and prudent investment management. The
Fund is comprised of three separate portfolios, Insured Portfolio, National
Portfolio and Limited Maturity Portfolio, each of which is, in effect, a
separate fund issuing its own shares. Each Portfolio seeks to achieve its
objective by investing in a diversified portfolio of obligations issued by or
on behalf of states, territories and possessions of the United States and the
District of Columbia and their political subdivisions, agencies and
instrumentalities, the interest from which is exempt from federal income tax
(such obligations are herein referred to as "Municipal Bonds"). Municipal Bonds
include general obligations bonds, revenue or special obligation bonds,
industrial development bonds, variable rate demand notes, and short-term tax-
exempt municipal obligations such as tax anticipation notes. Each Portfolio at
all times, except during temporary defensive periods, maintains at least 80% of
its net assets invested in Municipal Bonds. In addition, each Portfolio may not
purchase securities other than Municipal Bonds and Temporary Investments
described below. These are fundamental policies of each Portfolio and may not
be changed without a vote of the majority of the outstanding shares of the
Portfolio. Each Portfolio currently contemplates that it will not invest more
than 25% of its total assets (taken at market value) in Municipal Bonds whose
issuers are located in the same state. There can be no assurance that the
objective of any Portfolio can be attained.     
   
  While the Fund does not intend to realize taxable investment income, each
Portfolio has the authority to invest as much as 20% of its net assets on a
temporary basis in taxable money market securities with a remaining maturity
not in excess of one year from the date of purchase ("Temporary Investments")
for liquidity purposes or as a temporary investment of cash pending investment
of such cash in Municipal Bonds. 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 Investment Adviser, market
conditions warrant. Temporary Investments consist of U.S. Government
securities, U.S. Government agency securities, domestic bank certificates of
deposit and bankers' acceptances, short-term corporate debt securities such as
commercial paper, and repurchase agreements. From time to time, the Fund may
realize capital gains which will constitute taxable income. In addition, the
Fund may invest in certain tax-exempt securities which are classified as
"private activity bonds," which may subject certain investors to an alternative
minimum tax. (At June 30, 1996, approximately 16.9% of the Insured Portfolio's,
approximately 15.4% of the National Portfolio's and approximately 8.0% of the
Limited Maturity Portfolio's net assets were invested in "private activity
bonds.") These figures should not be considered representative of the
respective Portfolio's private activity bond positions for any future period.
See "Dividends, Distributions and Taxes."     
          
  Certain instruments in which the Fund may invest may be characterized as
derivative instruments. The Insured Portfolio, the National Portfolio and the
Limited Maturity Portfolio are authorized to engage in transactions in
financial futures contracts for hedging purposes. For a more complete
description of futures transactions, see "Financial Futures Contracts and
Derivatives" below and the Statement of Additional Information.     
 
  Investment in the Fund offers several benefits. The Fund offers investors the
opportunity to receive income exempt from federal income taxes from a
diversified, professionally managed portfolio of 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 are at least partially offset by the fact
that there are expenses in operating an investment company. Such expenses
 
                                       19
<PAGE>
 
consist primarily of the investment advisory fee and operational expenses,
including, in the case of the Insured Portfolio, premiums for insurance on
portfolio securities.
 
                     INVESTMENT POLICIES OF THE PORTFOLIOS
 
  Each Portfolio pursues its investment objective through the separate
investment policies described below. These policies differ with respect to the
maturity and quality of portfolio securities in which a Portfolio may invest,
and these policies can be expected to affect the yield on each Portfolio and
the degree of market, financial and interest rate risk to which the Portfolio
is subject. Generally, Municipal Bonds with longer maturities tend to produce
higher yield and are subject to greater market fluctuations as a result of
changes in interest rates ("market risk") than are Municipal Bonds with shorter
maturities. Generally, lower rated Municipal Bonds will provide a higher yield
than higher rated Municipal Bonds of similar maturity but are subject to
greater market risk and are also subject to a greater degree of risk with
respect to the ability of the issuer to meet its principal and interest
obligations ("financial risk"). A Portfolio's net asset value may fall when
interest rates rise and rise when interest rates fall. In general, Municipal
Bonds with longer maturities will be subject to greater volatility resulting
from interest rate fluctuation than will Municipal Bonds with shorter
maturities ("interest rate risk"). See "Additional Information--Rating
Information" for information with respect to ratings assigned to Municipal
Bonds and Temporary Investments by rating agencies.
 
                               INSURED PORTFOLIO
 
  The Insured Portfolio may invest in investment grade Municipal Bonds covered
by portfolio insurance guaranteeing the timely payment of principal at maturity
and interest. Investment grade Municipal Bonds are those rated at the date of
purchase in the four highest rating categories of Standard & Poor's Corporation
(AAA, AA, A and BBB) or Moody's Investors Service, Inc. (Aaa, Aa, A and Baa) in
the case of long-term debt, rated MIG 1 through MIG 4 by Moody's Investors
Service or in the four highest bond ratings of, or rated SP-1+ through SP-2 by,
Standard & Poor's Corporation in the case of short-term notes, and rated P-1 or
P-2 in the case of Moody's Investors Service or A-1+ through A-2 by Standard &
Poor's Corporation in the case of tax-exempt commercial paper. Depending on
market conditions, it is expected that Municipal Bonds with maturities beyond
five years will comprise a major portion of this Portfolio.
 
  The Insured Portfolio may invest only in Municipal Bonds that, at the time of
purchase, either (1) are insured under an insurance policy purchased by the
Fund or (2) are insured under an insurance policy obtained by the issuer
thereof or any other party from an insurance carrier meeting the criteria of
the Fund set forth below. The Fund has purchased from AMBAC Indemnity
Corporation ("AMBAC"), Municipal Bond Investors Assurance Corporation ("MBIA")
and Financial Security Assurance Inc. ("FSA"), separate Mutual Fund Insurance
Policies (the "Policies"), each of which guarantees the payment of principal
and interest on specified eligible Municipal Bonds purchased by the Insured
Portfolio ("Insured Municipal Bonds"). Consequently, some of the Insured
Municipal Bonds in the Insured Portfolio may be insured by AMBAC, while others
may be insured by MBIA or FSA. The Policies generally have the same
characteristics and features. A Municipal Bond is eligible for coverage if it
meets certain requirements of the insurance company set forth in a Policy.
Additional information regarding these eligibility requirements is set forth in
the Statement of Additional Information. In the event interest or principal on
an Insured Municipal Bond is not paid when due, AMBAC or MBIA or FSA (depending
on which Policy covers the bond) is obligated
 
                                       20
<PAGE>
 
under its Policy to make payment not later than 30 days after it has been
notified by, and provided with documentation from, the Fund that such
nonpayment has occurred. The insurance feature reduces financial risk, but the
cost thereof and the restrictions on investments imposed by the guidelines in
the insurance policy reduce the yield to shareholders.
 
  The Policies will be effective only as to Insured Municipal Bonds
beneficially owned by the Insured Portfolio. In the event of a sale of any
Municipal Bonds held by the Insured Portfolio, the issuer of the relevant
Policy is liable only for those payments of interest and principal which are
then due and owing. The Policies do not guarantee the market value of the
Insured Municipal Bonds or the value of the shares of the Insured Portfolio. It
is the intention of the Insured Portfolio, however, to retain any insured
securities which are in default or in significant risk of default and to place
a value on the insurance, which ordinarily will be the difference between the
market value of the defaulted security and the market value of similar
securities which are not in default. In certain circumstances, however, the
Fund's management may determine that an alternative value for the insurance,
such as the difference between the market value of the defaulted security and
its par value, is more appropriate. As the result of the value placed on the
insurance with respect to securities held in the Insured Portfolio which were
in default at the end of the Fund's last fiscal year, such securities were
effectively valued at par. The Insured Portfolio will be unable to manage the
portfolio to the extent it holds defaulted securities, which may limit its
ability in certain circumstances to purchase other Municipal Bonds. See "Net
Asset Value" in the Statement of Additional Information for a more complete
description of the Insured Portfolios method of valuing defaulted securities
and securities which have a significant risk of default. Further information
with respect to the portfolio insurance is also set forth in the Statement of
Additional Information.
 
  AMBAC, MBIA and FSA may not withdraw coverage on securities insured by their
Policies and held by the Insured Portfolio so long as they remain in the
Portfolio. AMBAC, MBIA and FSA may not cancel their Policies for any reason
except failure to pay premiums when due. AMBAC and FSA have reserved the right
at any time upon written notice to the Fund to refuse to insure any additional
municipal securities purchased by the Insured Portfolio after the effective
date of such notice. The Board of Directors of the Fund has reserved the right
to terminate any of the Policies if it determines that the benefits to the
Insured Portfolio of having its portfolio insured are not justified by the
expense involved.
 
  The premiums for the Policies are paid by the Insured Portfolio and the yield
on the Portfolio is reduced thereby. The Investment Adviser estimates that the
current cost of the annual premiums will range from approximately .08% to .20%
of the average net assets of the Insured Portfolio. The estimate is based on
the expected composition of the Portfolio.
 
                               NATIONAL PORTFOLIO
 
  The National Portfolio invests in a portfolio primarily of medium to lower
grade Municipal Bonds with maturities beyond five years. This Portfolio
normally can be expected to offer the highest yields of the three Portfolios,
but it will also be subject to the highest market and financial risks. Because
an investment in the National Portfolio entails relatively greater risks, it
may not be an appropriate investment for all investors.
 
  The investment policies of the National Portfolio are not governed by
specific rating categories. Management of the Fund will seek primarily medium
and lower grade Municipal Bonds, including short-term tax-exempt notes, tax-
exempt commercial paper and variable rate tax-exempt demand notes. Medium grade
 
                                       21
<PAGE>
 
long-term debt obligations are those rated A and BBB by Standard & Poor's or A
and Baa by Moody's and unrated obligations of comparable quality. Lower grade
obligations (commonly known as "junk bonds") are those rated below BBB or Baa
and unrated obligations of comparable quality. Lower grade obligations will
generally be more speculative with respect to the capacity of the issuer to
make interest and principal payments. Because issuers of Municipal Bonds having
these characteristics may choose not to have their obligations rated, it is
possible that a substantial portion of the National Portfolio's portfolio may
consist of obligations which are not rated. Unrated bonds are not necessarily
of lower quality than rated bonds, but the market for rated bonds is often
broader. It is not the present intention of the Portfolio to invest over 35% of
its assets in securities rated below Baa by Moody's or in securities rated
below BBB by Standard & Poor's.
 
  Junk bonds are considered by Standard & Poor's and Moody's to have varying
degrees of speculative characteristics. Consequently, although junk bonds 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 junk bonds will be made only when,
in the judgment of the Fund's management, such securities provide attractive
total return potential relative to the risk of such securities, as compared to
higher quality debt securities. The National Portfolio will not invest in debt
securities in the lowest rating categories (those rated CC or lower by Standard
& Poor's or Ca or lower by Moody's) unless the Fund's management 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.
The National Portfolio does not intend to purchase debt securities that are in
default or which the Fund's management believes will be in default. The
Statement of Additional Information contains a more detailed description of the
risks involved in purchasing junk bonds.
   
  The table below shows the average monthly dollar-weighted market value, by
Standard & Poor's rating category, of the securities held by the National
Portfolio during the year ended June 30, 1996:     
<TABLE>   
<CAPTION>
                                                                        % MARKET
                                                                          VALUE
                                                                % NET   MUNICIPAL
RATING                                                          ASSETS    BONDS
- ------                                                          ------  ---------
<S>                                                             <C>     <C>
AAA............................................................ 36.95%    37.91%
AA............................................................. 19.17     19.67
A..............................................................  9.83     10.08
BBB............................................................ 15.74     16.14
BB.............................................................  3.30      3.39
NR*............................................................ 12.49     12.81
                                                                -----     -----
                                                                97.48       100
                                                                =====     =====
</TABLE>    
- --------
   
* Bonds which are not rated by Standard & Poor's (including bonds not rated by
 any nationally recognized statistical rating organization). With respect to
 the percentage of the Portfolio's assets invested in such securities, the
 Investment Adviser believes that 2.52% are of comparable quality to bonds
 rated AAA, 0% are of comparable quality to bonds rated AA, 1.62% are of
 comparable quality to bonds rated A, 3.53% are of comparable quality to bonds
 rated BBB, 4.46% are of comparable quality to bonds rated BB and 0.36% are of
 comparable quality to bonds rated B. This determination is based on the
 Investment Adviser's own internal evaluation and does not necessarily reflect
 how such securities would be rated by Standard & Poor's or any other rating
 agency if such an agency were to rate the security.     
 
  It is expected that the National Portfolio will consist primarily of revenue
bonds emphasizing hospital, health care, public utility and housing issues.
 
 
                                       22
<PAGE>
 
                           LIMITED MATURITY PORTFOLIO
 
  The Limited Maturity Portfolio invests in a portfolio primarily of short-term
investment grade Municipal Bonds. Municipal Bonds in the Limited Maturity
Portfolio will be either Municipal Bonds with a remaining maturity of less than
four years or short-term municipal notes, which typically are issued with a
maturity of not more than one year. The Limited Maturity Portfolio will treat
Municipal Bonds which it has the option to require the issuer to redeem within
four years as having a remaining maturity of less than four years, even if the
period to the stated maturity date of such Bonds is greater than four years.
Municipal notes include tax anticipation notes, bond anticipation notes and
revenue anticipation notes. The Limited Maturity Portfolio can be expected to
offer a lower yield than the longer-term Portfolios. Interest rates on short-
term Municipal Bonds may fluctuate more widely from time to time than interest
rates on long-term Municipal Bonds. However, because of the shorter maturities,
the market value of the Municipal Bonds held by the Limited Maturity Portfolio
can be expected to fluctuate less in value as a result of changes in interest
rates.
 
  The Limited Maturity Portfolio will invest only in Municipal Bonds rated at
the date of purchase in the four highest ratings of Standard & Poor's (AAA, AA,
A and BBB) or Moody's (Aaa, Aa, A and Baa) in the case of long-term debt, rated
by Moody's as MIG 1 through MIG 4 or in the four highest bond ratings of, or
rated SP-1+ through SP-2 by, Standard & Poor's in the case of short-term tax-
exempt notes, and rated by Moody's P-1 through P-2 or rated A-1+ through A-3 by
Standard & Poor's in the case of tax-exempt commercial paper. The Limited
Maturity Portfolio will also invest in other Municipal Bonds deemed to qualify
for such ratings and in variable rate tax-exempt demand notes. Securities rated
in the lowest of these categories are considered to have some speculative
characteristics. The Limited Maturity Portfolio may continue to hold securities
which, after being purchased by the Portfolio, are downgraded to a rating lower
than those set forth above.
 
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 are issued by or on behalf of
public authorities to finance various privately operated facilities, including
pollution control facilities. Such obligations are included within the term
Municipal Bonds if the interest paid thereon is exempt from federal income tax.
Municipal Bonds also include short-term tax-exempt municipal obligations such
as tax anticipation notes, bond anticipation notes, revenue anticipation notes,
variable rate demand notes and Public Housing Authority notes that are fully
secured by a pledge of the full faith and credit of the United States.     
 
  The two principal classifications of Municipal Bonds are "general obligation"
and "revenue" or "special obligation" 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 or special obligation bonds are
payable only from the revenues derived from a particular facility or class of
facilities or, in some cases, from the proceeds of a special excise tax or
other specific revenue source such as from the user of the facility being
financed. Industrial development bonds are in most cases revenue bonds and do
not generally constitute the pledge of the credit or taxing power of the issuer
of such bonds. The payment of the principal and interest on such industrial
revenue bonds depends solely on the ability of the user of the facilities
financed by the bonds to
 
                                       23
<PAGE>
 
meet its financial obligations and the pledge, if any, of real and personal
property so financed as security for such payment. The Portfolio may also
include "moral obligation" bonds which are normally issued by special purpose
public authorities. If an issuer of moral obligation bonds is unable to meet
its obligations, the repayment of such bonds becomes a moral commitment but not
a legal obligation of the state or municipality in question.
 
  Municipal 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 a Portfolio 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 only make 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 obligation will generally decrease. When a Portfolio engages
in when-issued and delayed delivery transactions, the Portfolio relies on the
buyer or seller, as the case may be, to consummate the trade. Failure of the
buyer or seller to do so may result in the Portfolio's missing the opportunity
of obtaining a price considered to be advantageous. The Fund will maintain a
separate account as its custodian bank consisting of cash or liquid Municipal
Bonds (valued on a daily basis) equal at all times to the amount of the when-
issued commitment.
 
  Variable rate demand notes ("VRDNs") are tax-exempt obligations which contain
a floating or variable interest rate adjustment formula and an unconditional
right of demand to receive payment of the unpaid principal balance plus accrued
interest upon a short notice period not to exceed seven days. The interest
rates are adjustable at intervals ranging from daily up to six months to some
prevailing market rate for similar investments, such adjustment formula being
calculated to maintain the market value of the VRDN at approximately the par
value of the VRDN upon the adjustment date. The adjustments are typically based
upon the prime rate of a bank or some other appropriate interest rate
adjustment index.
 
  The Fund may also invest in VRDNs in the form of participation interests
("Participating VRDNs") in variable rate tax-exempt obligations held by a
financial institution, typically a commercial bank ("institution").
Participating VRDNs 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 VRDNs from
the institution upon a specified number of days' notice, not to exceed seven
days. In addition, the Participating VRDN is backed by an irrevocable letter of
credit or guaranty of the institution. The Fund has an undivided interest in
the underlying obligation and thus participates on the same basis as the
institution in such obligation except that the institution typically retains
fees out of the interest paid on the obligation for servicing the obligation,
providing the letter of credit and issuing the repurchase commitment.
 
  The Fund has been advised by its counsel to the effect that the interest
received on Participating VRDNs will be treated as interest from tax-exempt
obligations as long as the Fund does not invest more than a limited amount (not
more than 20%) of its total assets in such investments and certain other
conditions are met. It is contemplated that the Fund will not invest more than
a limited amount of its total assets in Participating VRDNs.
 
 
                                       24
<PAGE>
 
  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 maturity of the obligation, and the rating
of the issue. The ability of a Portfolio to achieve its investment objective is
also dependent on the continuing ability of the issuers of the Municipal Bonds
in which the Portfolio 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, within a particular classification and between
classifications, depending on numerous factors. Furthermore, the rights of
holders of Municipal Bonds and the obligations of the issuers of such Municipal
Bonds may be subject to applicable bankruptcy, insolvency and similar laws and
court decisions affecting the rights of creditors generally and such laws, if
any, that may be enacted by Congress or state legislatures imposing a
moratorium on the payment of principal and interest or imposing other
constraints or conditions on the payment of principal of and interest on
Municipal Bonds.
 
  From time to time, proposals have been introduced before Congress for the
purpose of restricting or eliminating the federal income tax exemption for
interest on Municipal Bonds. It may be expected that similar proposals may be
introduced in the future. If such a proposal were enacted, the ability of the
Portfolios to pay "exempt-interest" dividends might be adversely affected and
the Fund would re-evaluate its investment objective and policies and consider
changes in its structure. See "Dividends, Distributions and Taxes."
 
FORWARD COMMITMENTS
 
  Each Portfolio may purchase Municipal Bonds on a forward commitment basis at
fixed purchase terms. The purchase will be recorded on the date the Portfolio
enters into the commitment and the value of the security will thereafter be
reflected in the calculation of the Portfolio's net asset value. The value of
the security on the delivery date may be more or less than its purchase price.
A separate account of the Portfolio will be established with its custodian
consisting of cash or liquid Municipal Bonds having a market value at all times
at least equal to the amount of the forward commitment.
 
FINANCIAL FUTURES CONTRACTS AND DERIVATIVES
   
  The Insured Portfolio, the National Portfolio and the Limited Maturity
Portfolio (collectively, the "Portfolios") are authorized to purchase and sell
certain financial futures contracts ("futures contracts") and options on such
futures contracts solely for the purpose of hedging their investments in
Municipal Bonds against declines in value and to hedge against increases in the
cost of securities the Portfolios intend to purchase. A financial futures
contract obligates the seller of a contract to deliver and the purchaser of a
contract to take delivery of the type of financial instrument covered by the
contract or, in the case of index-based 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 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.     
       
  The Portfolios intend to trade in futures contracts based upon The Bond Buyer
Municipal Bond Index, a price-weighted measure of the market value of 40 large,
recently issued tax-exempt bonds, and to engage in transactions in exchange-
traded futures contracts on U.S. Treasury securities and options on such
futures. If
 
                                       25
<PAGE>
 
   
making or accepting delivery of the underlying commodity is not desired, a
position in a futures contract or an option on a futures contract may be
terminated only by entering into an offsetting transaction on the exchange on
which the position was established and only if there is a liquid market for
such contract. If it is not economically practicable, or otherwise possible to
close a futures position or certain option positions entered into by a
Portfolio, the Portfolio could be required to make continuing daily cash
payments of variation margin in the event of adverse price movements. In such
situations, if the Portfolio 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. In addition, the Portfolio may be required
to perform under the terms of its contracts. The inability to close futures or
options positions could also have an adverse impact on the Portfolio's ability
to hedge effectively. There is also risk of loss by a Portfolio of margin
deposits in the event of bankruptcy of a broker with whom the Portfolio has an
open position in a futures contract, or the exchange or clearing organization
on which that contract is traded. The Portfolios may also engage in
transactions in other futures contracts, such as futures contracts on other
municipal bond indexes which may become available, if the Investment Adviser
believes such contracts would be appropriate for hedging the Portfolios'
investments in Municipal Bonds.     
 
  Utilization of futures or option contracts involves the risk of imperfect
correlation in movements in the price of such contracts and movements in the
price of the security or securities which are the subject of the hedge. If the
price of the futures or option contract moves more or less than the price of
the security or securities that are the subject of the hedge, a Portfolio will
experience a gain or loss which will not be completely offset by movements in
the price of such security, which could occur as a result of many factors,
including where the securities underlying futures or option 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 an index futures contract.
The trading of futures contracts or options on futures contracts based on
indexes of securities also involves a risk of imperfect correlation between the
value of the futures contracts and the value of the underlying index. The
anticipated spread between such values or in the correlation between the
futures contract and the underlying security may be affected by differences in
markets, such as margin requirements, market liquidity and the participation of
speculators in the futures markets. Moreover, when a Portfolio enters into
transactions in futures contracts on U.S. Treasury securities, or options on
such contracts, the underlying securities will not correspond to securities
held by the Portfolio. Finally, in the case of futures contracts on U.S.
Treasury securities and options on such futures contracts, the anticipated
correlation of price movements between U.S. Treasury 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 Portfolios'
being deemed to be "commodity pools," as defined under such regulations,
provided that certain restrictions are adhered to. In particular, among other
requirements, the Portfolios may either (a) purchase and sell futures contracts
only for bona fide hedging purposes, as defined under CFTC regulations, or (b)
limit any transaction not qualifying as bona fide hedging so that the sum of
the amount of initial margin deposits and premiums paid on such positions would
not exceed 5% of the market value of the Portfolio's net assets. Margin
deposits may consist of cash or securities acceptable to the broker and the
relevant contract market.
 
                                       26
<PAGE>
 
          
  When a Portfolio purchases a futures contract, it will maintain an amount of
cash, cash equivalents or commercial paper or other liquid securities in a
segregated account with the Fund's custodian, so that the amount segregated
plus the amount of initial margin and option premiums held in the account of
its broker equals the value represented by the futures contract, as reflected
by its daily settlement price, thereby ensuring that the use of such futures
contract is unleveraged. It is not anticipated that transactions in the futures
contracts will have the effect of increasing portfolio turnover.     
 
  Reference is made to the Statement of Additional Information for further
information on financial futures contracts.
   
  The Fund may invest in a variety of instruments which may be characterized as
"Derivative Securities." The Fund may invest in Municipal Bonds, 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. 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. 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 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. The
Manager believes that indexed and inverse floating obligations represent a
flexible portfolio management instrument for the Fund which allows the Manager
to vary the degree of investment leverage relatively efficiently under
different market conditions. 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 10% of the
Fund's net assets.     
 
INVESTMENT RESTRICTIONS
 
  The Fund has adopted a number of restrictions and policies relating to the
investment of its assets and its activities, which are fundamental policies of
the Fund and may not be changed without the approval of the holders of a
majority of the Fund's outstanding voting securities (including a majority of
the shares of each Portfolio). One such restriction prohibits the Fund from
entering into a repurchase agreement if, as a result thereof, more than 10% of
the total assets of any Portfolio (taken at market value at the time of each
investment) would be subject to repurchase agreements maturing in more than
seven days. Investors are referred to the Statement of Additional Information
for a complete description of such restrictions and policies.
 
                                       27
<PAGE>
 
                               INVESTMENT ADVISER
   
  The investment adviser to the Fund is Fund Asset Management, L.P. ("FAM"), an
affiliate of Merrill Lynch Asset Management L.P. ("MLAM"), an indirect
subsidiary of Merrill Lynch & Co., Inc., a financial services holding company
and the parent of Merrill Lynch. The address of FAM is P.O. Box 9011,
Princeton, New Jersey 08543-9011. FAM or MLAM acts as the Investment Adviser
for more than 130 registered investment companies. As of September 30, 1996,
the Investment Adviser and MLAM had a total of $214.1 billion in investment
company and other portfolio assets under management, including accounts of
certain affiliates of the investment adviser.     
   
  Kenneth A. Jacob has served as the Portfolio Manager for the Insured
Portfolio since 1995 and is primarily responsible for the Fund's day-to-day
management of that portfolio. He has served as Vice President of the Investment
Adviser since 1984. Walter O'Connor has served as the Portfolio Manager for the
National Portfolio since 1996 and has served as a Vice President of the
Investment Adviser since 1993. Peter J. Hayes has served as the Portfolio
Manager for the Limited Maturity Portfolio since 1995 and has served as a Vice
President of the Investment Adviser since 1988.     
   
  FAM, subject to the general supervision of the Fund's Board of Directors,
renders investment advice to the Fund and is responsible for the overall
management of the Fund's business affairs. The responsibility for making
decisions to buy, sell or hold a particular security rests with FAM. For the
fiscal year ended June 30, 1996, the fee paid by the Fund to FAM was
$17,764,752 of which $8,850,984 was received with respect to the Insured
Portfolio (representing 0.36% of its average net assets), $7,014,416 was
received with respect to the National Portfolio (representing 0.47% of its
average net assets) and $1,899,352 was received with respect to the Limited
Maturity Portfolio (representing 0.33% of its average net assets).     
   
  The Investment Advisory Agreement obligates each Portfolio to pay certain
expenses incurred in its operation and a portion of the Fund's general
administrative expenses allocated on the basis of the asset size of the
respective Portfolios. The Fund's total expenses for the year ended June 30,
1996 were $30,974,676, of which $16,545,150 was attributable to the Insured
Portfolio (representing 0.43% of average net assets for Class A shares, 1.19%
of average net assets for Class B shares, 1.24% of average net assets for Class
C shares and 0.68% of average net assets for Class D shares), $11,544,600 was
attributable to the National Portfolio (representing 0.56% of average net
assets for Class A shares, 1.32% of average net assets for Class B shares,
1.37% of average net assets for Class C shares and 0.81% of average net assets
for Class D shares) and $2,884,926 was attributable to the Limited Maturity
Portfolio (representing 0.44% of average net assets for Class A shares, 0.80%
of average net assets for Class B shares, 0.80% of average net assets for Class
C shares and 0.54% of average net assets for Class D shares). FAM was not
required to reduce its fee or reimburse any of the Fund's expenses for the 1996
fiscal year.     
   
  The Fund pays certain expenses incurred in its operations including, among
other things, taxes; expenses for legal and auditing services; and costs of
printing proxies, stock certificates, shareholder reports, prospectuses and
statements of additional information. Also, accounting services are provided to
the Fund by the Investment Adviser and the Fund reimburses the Investment
Adviser for its costs in connection with such services. For the fiscal year
ended June 30, 1996, the Fund reimbursed the Investment Adviser $470,695 for
accounting services of which $206,637 was received with respect to the Insured
Portfolio, $180,650 was received with respect to the National Portfolio and
$83,408 was received with respect to the Limited Maturity Portfolio.     
 
                                       28
<PAGE>
 
TRANSFER AGENCY SERVICES
   
  Merrill Lynch Financial Data Services, Inc. ("MLFDS"), which is a wholly
owned subsidiary of Merrill Lynch & Co., Inc., acts as the Fund'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, MLFDS is responsible for the issuance, transfer and
redemption of shares and the opening and maintenance of shareholder accounts.
Pursuant to the Transfer Agency Agreement, MLFDS receives an annual fee of
$11.00 per shareholder account for Class A or Class D shares of the Portfolios
and $14.00 per shareholder account for Class B or Class C shares of the
Portfolios, and is entitled to reimbursement for out-of-pocket expenses
incurred by it under the Transfer Agency Agreement. For the year ended June 30,
1996, the Insured, National and Limited Maturity Portfolios of the Fund
incurred fees of $953,784, $632,865 and $212,289, respectively, pursuant to the
Transfer Agency Agreement. At September 30, 1996, the Fund had:     

                      NUMBER OF SHAREHOLDER ACCOUNTS
<TABLE>    
<CAPTION>
                                                                     LIMITED
  CLASS                    INSURED PORTFOLIO NATIONAL PORTFOLIO MATURITY PORTFOLIO
  <S>                      <C>               <C>                <C>
  A                             28,766             22,191             5,886
  B                             22,123             12,564             1,797
  C                                967                497                13
  D                                824                670               174
</TABLE>    
   
At these levels of accounts, the annual fee payable to the Transfer Agent would
aggregate approximately $1.2 million plus out-of-pocket expenses.     
 
CODE OF ETHICS
 
  The Board of Directors of the Fund has adopted a Code of Ethics under Rule
17j-1 of the Investment Company Act of 1940 which incorporates the Code of
Ethics of the Investment Adviser (together, the "Codes"). The Codes
significantly restrict the personal investing activities of all employees of
the Investment Adviser and, as described below, impose additional, more
onerous, restrictions on fund investment personnel.
 
  The Codes require that all employees of the Investment Adviser preclear any
personal securities investment (with limited exceptions, such as government
securities). The preclearance requirement and associated procedures are
designed to identify any substantive prohibition or limitation applicable to
the proposed investment. The substantive restrictions applicable to all
employees of the Investment Adviser include a ban on acquiring any securities
in a "hot" initial public offering and a prohibition from profiting on short-
term trading in securities. In addition, no employee may purchase or sell any
security which at the time is being purchased or sold (as the case may be), or
to the knowledge of the employee is being considered for purchase or sale, by
any fund advised by the Investment Adviser. Furthermore, the Codes provide for
trading "blackout periods" which prohibit trading by investment personnel of
the Fund within periods of trading by the Fund in the same (or equivalent)
security (15 or 30 days depending upon the transaction).
 
                                       29
<PAGE>
 
                                   DIRECTORS
 
  The Directors of the Fund consist of six individuals, five of whom are not
"interested persons" of the Fund as defined in the Investment Company Act of
1940. The Directors of the Fund are responsible for the overall supervision of
the operations of the Fund and perform the various duties imposed on the
directors of investment companies by the Investment Company Act of 1940.
 
The Directors of the Fund are:
          
  Arthur Zeikel*--President of the Investment Adviser and its affiliate, MLAM;
President and Director of Princeton Services, Inc. ("Princeton Services");
Executive Vice President of ML & Co.; and Director of the Merrill Lynch Funds
Distributor, Inc. (the "Distributor").     
 
  Ronald W. Forbes--Associate Professor of Finance, School of Business, State
University of New York at Albany.
   
  Cynthia A. Montgomery--Professor of Competition and Strategy, Harvard
Business School.     
 
  Charles C. Reilly--Adjunct Professor, Columbia University Graduate School of
Business.
   
  Kevin A. Ryan--Professor of Education at Boston University; Founder and
current Director of The Boston University Center for Advancement of Ethics and
Character.     
   
  Richard R. West--Dean Emeritus, New York University Leonard N. Stern School
of Business Administration.     
- --------
* Interested person, as defined in the Investment Company Act of 1940, of the
  Fund.
 
                              PURCHASE OF SHARES
   
  Each Portfolio offers its shares in four classes at a public offering price
equal to the net asset value plus varying sales charges as set forth below.
Merrill Lynch Funds Distributor, Inc. (the "Distributor"), an affiliate of
both the Investment Adviser and Merrill Lynch, acts as the Distributor of the
shares. Class C shares of the Limited Maturity Portfolio are offered only
through the Exchange Privilege. See p. 49.     
 
  Shares may be purchased directly from the Distributor or from other
securities dealers, including Merrill Lynch, with whom the Distributor has
entered into selected dealer agreements; however, only Class A and Class D
shares may be available for purchase through securities dealers, other than
Merrill Lynch, which are eligible to sell shares. The Fund is offering shares
in four classes of its Portfolios 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 (the "initial sales charge alternative") 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. Net asset value
per share will be determined in the manner set forth under "Net Asset Value."
The minimum initial purchase in each Portfolio is $1,000 and the minimum
subsequent purchase in each Portfolio is $50. Merrill Lynch may charge
 
                                      30
<PAGE>
 
   
its customers a processing fee (currently $4.85) to confirm a sale of shares.
Purchases directly through the Fund's transfer agent are not subject to the
processing fee.     
 
  Because retirement plans qualified under Section 401 of the Internal Revenue
Code will be unable to benefit from the tax-exempt dividends of the Fund, the
shares of the Fund may not be suitable investments for such retirement plans.
 
  Each of the Portfolios 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 shares
are sold to investors choosing the initial sales charge alternative and shares
of Class B and Class C shares are sold to investors choosing the deferred
sales charge alternatives. Class C shares of the Limited Maturity Portfolio
are available only through the Exchange Privilege and may not be purchased
except through exchange of Class C shares of another Portfolio or another
Fund.
   
  Investors should determine whether under their particular circumstances it
is more advantageous to incur the initial sales charge or to have the initial
purchase price invested with the Portfolio with the investment thereafter
being subject to a contingent deferred sales charge and ongoing distribution
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 the Merrill Lynch Select Pricing SM
System on page 8. Each Class A, Class B, Class C and Class D share of a
Portfolio represents identical interests in the Portfolio 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 deferred sales charges 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, 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 a Portfolio 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. See "Distribution Plans" below. Each class
has different exchange privileges. See "Shareholder Services--Exchange
Privileges."     
 
  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 deferred sales charges with respect to Class B and Class C shares in
that the sales charges 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, which are eligible to sell
shares.
 
                                      31
<PAGE>
 
  The following tables set forth a summary of the distribution arrangements
for each class of shares under the Merrill Lynch Select Pricing SM System.
 
                        INSURED AND NATIONAL PORTFOLIOS
 
<TABLE>    
<CAPTION>
                                          ACCOUNT
                                        MAINTENANCE DISTRIBUTION       CONVERSION
  CLASS         SALES CHARGE(/1/)           FEE         FEE             FEATURE
- ---------------------------------------------------------------------------------------
  <S>     <C>                           <C>         <C>          <C>
    A      Maximum 4.00% initial sales      No           No                No
                     charge(/2/)(/3/)
- ---------------------------------------------------------------------------------------
    B     CDSC for a period of 4 years,    0.25%        0.50%     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%                                    ten years(/4/)
- ---------------------------------------------------------------------------------------
    C        1.0% CDSC for one year        0.25%        0.55%              No
            decreasing to 0.0% after
                 the first year
- ---------------------------------------------------------------------------------------
    D         Maximum 4.00% initial        0.25%         No                No
                  sales charge(/3/)
</TABLE>    
 
 
                          LIMITED MATURITY PORTFOLIO
 
<TABLE>    
<CAPTION>
                                         ACCOUNT
                                       MAINTENANCE DISTRIBUTION       CONVERSION
  CLASS        SALES CHARGE(/1/)           FEE         FEE             FEATURE
- --------------------------------------------------------------------------------------
  <S>     <C>                          <C>         <C>          <C>
    A     Maximum 1.00% initial sales      No           No                No
                     charge(/2/)(/3/)
- --------------------------------------------------------------------------------------
    B        CDSC at a rate of 1.0%       0.15%        0.20%     B shares convert to
             during the first year,                             D shares automatically
          decreasing to 0.0% after the                           after approximately
                   first year                                         ten years(/4/)
- --------------------------------------------------------------------------------------
  C(/5/)     1.0% CDSC for one year       0.15%        0.20%              No
          decreasing to 0.0% after the
                   first year
- --------------------------------------------------------------------------------------
    D        Maximum 1.00% 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 may be 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 for the Insured and National
    Portfolios. Reduced for purchases of $100,000 or more for Limited Maturity
    Portfolio. 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 for the Insured and National Portfolios and .20% CDSC for the
    Limited Maturity Portfolio, for one year.     
   
(4) The conversion period for dividend reinvestment shares is 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 a Portfolio 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.     
   
(5) Class C shares of the Limited Maturity Portfolio are offered only through
    the Exchange Privilege. See p. 49.     
 
                                      32
<PAGE>
 
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 shares rather than Class D
shares because there is an account maintenance fee imposed on Class D shares.
 
  The initial sales charges, computed as indicated below, are reduced on larger
purchases. The Distributor may reallow discounts to securities dealers with
whom it has agreements and retain the balance over such discount. At times the
Distributor may reallow the entire sales charge to selected dealers, in which
case such dealers may be deemed to be underwriters within the meaning of the
Securities Act of 1933 and subject to liability as such. The Distributor will
retain the entire sales charge on orders placed directly with it.
 
  The public offering price of Class A and Class D shares of the Portfolios,
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:
 
         CLASS A AND CLASS D SHARES OF INSURED AND NATIONAL PORTFOLIOS
 
<TABLE>   
<CAPTION>
                                              SALES CHARGE
                         -------------------------------------------------------
                                                                 DISCOUNT TO
                          SALES LOAD AS     SALES LOAD AS    SELECT DEALERS AS A
                         A PERCENTAGE OF  A PERCENTAGE* OF      PERCENTAGE OF
AMOUNT OF PURCHASE       OFFERING PRICE  NET 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
 
            CLASS A AND CLASS D SHARES OF LIMITED MATURITY PORTFOLIO
 
<CAPTION>
                                              SALES CHARGE
                         -------------------------------------------------------
                                                                 DISCOUNT TO
                          SALES LOAD AS     SALES LOAD AS    SELECT DEALERS AS A
                         A PERCENTAGE OF  A PERCENTAGE* OF      PERCENTAGE OF
AMOUNT OF PURCHASE       OFFERING PRICE  NET AMOUNT INVESTED   OFFERING PRICE
- ------------------       --------------- ------------------- -------------------
<S>                      <C>             <C>                 <C>
Less than $100,000......      1.00%             1.01%                .95%
$100,000 but less than
 $250,000...............       .75               .75                 .70
$250,000 but less than
 $500,000...............       .50               .50                 .45
$500,000 but less than
 $1,000,000.............       .30               .30                 .27
$1,000,000 and over**...       .00               .00                 .00
</TABLE>    
- --------
* Rounded to the nearest one-hundredth percent.
   
** The initial sales charges may be waived on Class A and Class D purchases of
   $1,000,000 or more made on or after October 21, 1994, but such purchases may
   be subject to a CDSC of 1.0% for the Insured and National Portfolios and
   0.20% for the Limited Maturity Portfolio, if the shares are redeemed within
   one year after purchase.     
 
                                       33
<PAGE>
 
   
  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 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
(the "Securities Act"). During the fiscal year ended June 30, 1996, the Insured
Portfolio, the National Portfolio and the Limited Maturity Portfolio sold
5,469,354, 1,874,548 and 2,286,543 Class A shares, respectively, for aggregate
net proceeds of $44,001,252, $19,100,358 and $22,746,544, respectively. The
gross sales charges for the sale of Class A shares of the Insured Portfolio,
the National Portfolio and the Limited Maturity Portfolio for that period were
$312,185, $197,666, $22,013 of which Merrill Lynch received $274,069 for the
Insured Portfolio, $177,142 for the National Portfolio and $19,981 for the
Limited Maturity Portfolio and the Distributor received $38,116 for the Insured
Portfolio, $20,524 for the National Portfolio and $2,032 for the Limited
Maturity Portfolio. For the fiscal year ended June 30, 1996, the Distributor
did not receive any 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 Insured, the National and the Limited Maturity Portfolios.     
   
  For the fiscal year ended June 30, 1996, the Insured Portfolio, the National
Portfolio and the Limited Maturity Portfolio sold 14,968,451, 13,624,624, and
5,319,786 Class D shares, respectively, for aggregate net proceeds of
$120,849,832, $139,439,739 and $52,931,793, respectively. The gross sales
charges for the sale of Class D shares of the Insured Portfolio, the National
Portfolio and the Limited Maturity Portfolio for that period were $110,187,
$128,043, and $33,732, of which the Distributor received $13,179 for the
Insured Portfolio, $12,764 for the National Portfolio, $3,167 for the Limited
Maturity Portfolio and Merrill Lynch received $97,008 for the Insured
Portfolio, $115,279 for the National Portfolio and $30,565 for the Limited
Maturity Portfolio. For the fiscal year ended June 30, 1996 the Distributor did
not receive any CDSC's with respect to redemption within one year after
purchase of Class D shares purchased subject to a front-end sales charge waiver
of the Insured, the National and the Limited Maturity Portfolios.     
   
  Eligible Class A Investors. Class A shares are offered to a limited group of
investors and also will be issued upon reinvestment of dividends from
outstanding Class A shares. Investors that currently own Class A shares of a
Portfolio in a shareholder account, including participants in the Merrill Lynch
BlueprintSM program, are entitled to purchase additional Class A shares of that
Portfolio in that account. Class A shares are available at net asset value to
corporate warranty insurance reserve fund programs provided that the program
has $3 million or more initially invested in MLAM-advised mutual funds. Also
eligible to purchase Class A shares at net asset value are participants in
certain investment programs, including TMASM Managed Trusts to which Merrill
Lynch Trust Company provides discretionary trustee services, collective
investment trusts for which Merrill Lynch Trust Company serves as Trustee and
certain purchases made in connection with the Merrill Lynch Mutual Fund Adviser
("MFA") program. In addition, Class A shares will be offered at net asset value
to Merrill Lynch & Co., Inc. and its subsidiaries and their directors and
employees and to members of the Boards of MLAM-advised investment companies,
including the Fund. 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. ("Municipal Strategy Fund") and Merrill Lynch High Income
Municipal Bond Fund,     
 
                                       34
<PAGE>
 
   
Inc. ("High Income Fund") 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.     
 
  As to purchase orders received by selected dealers prior to the close of the
New York Stock Exchange, which includes orders received after the close on the
previous day, the applicable offering price will be based on the net asset
value determined on the day the order is placed with the Distributor, provided
the order is received by the Distributor prior to 4:30 P.M., New York City
time, on that day. Any order may be rejected by the Distributor or the Fund.
Neither the Distributor nor the dealers are permitted to withhold placing
orders to benefit themselves by a price change. The Fund reserves the right to
suspend the sale of its shares to the public in response to conditions in the
Municipal Bond markets, or otherwise.
          
  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 under "Eligible Class A Investors."     
   
  Class A and Class D shares are offered at net asset value to certain
employer-sponsored retirement or savings plans and to Employee Access
Accounts SM available through employers which provide such plans. Class A and
Class D shares are offered at net asset value to shareholders of Municipal
Strategy Fund and High Income Fund 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.     
   
  Class D shares of the Fund are offered at net asset value to shareholders of
Municipal Strategy Fund and High Income Fund who wish to purchase shares of
the Fund with the net proceeds from a sale of certain of their shares of
common stock pursuant to a tender offer by Municipal Strategy Fund or High
Income Fund. This investment option is available only with respect to the
proceeds of Municipal Strategy Fund shares as to which no CDSC (as defined in
the Municipal Strategy Fund prospectus) is applicable, or with respect to the
proceeds of High Income Fund shares as to which no Early Withdrawal Charge (as
defined in the High Income Fund prospectus) is applicable. Such Class D shares
are offered subject to the conditions applicable to the offering of Class A
shares of the Fund to shareholders of Merrill Lynch Senior Floating Rate Fund,
Inc. ("Senior Floating Rate Fund") who wish to purchase shares of the Fund
with the net proceeds from a sale of certain of their shares of common stock
pursuant to a tender offer by Senior Floating Rate Fund, as described in the
Statement of Additional Information under "Purchase of Shares--Reduced Initial
Sales Charges--Closed-End Fund Investment Option."     
   
  Class D shares are offered with reduced sales charges and, in certain
circumstances, at net asset value, to participants in the Merrill Lynch
Blueprint SM Program.     
 
  Additional information concerning these reduced initial sales charges is set
forth in the Statement of Additional Information.
 
                                      35
<PAGE>
 
  Employee Access AccountsSM. Class A or Class D shares are offered at net
asset value to Employee Access Accounts available through employers that
provide employer sponsored retirement or savings plans that are eligible to
purchase such shares at net asset value. The initial minimum investments for
such accounts is $500, except that the initial minimum investments for shares
purchased for such accounts pursuant to the Automatic Investment Program is
$50.
 
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.
   
  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 of the Insured and National
Portfolios are subject to a four year CDSC and Class B shares of the Limited
Maturity Portfolio are subject to a one year CDSC, 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 relevant Portfolio and
thereafter will be subject to lower continuing fees. Class C shares of the
Limited Maturity Portfolio are available only through the Exchange Privilege.
See "Conversion of Class B Shares to Class D Shares" below. Both Class B and
Class C shares of each Portfolio are subject to an account maintenance fee of
0.25% (in the case of the National and Insured Portfolios) and 0.15% (in the
case of the Limited Maturity Portfolio) of net assets. Class B and Class C
shares of the Insured and National Portfolios are subject to distribution fees
0.50% and 0.55%, respectively, of the net assets. Class B and Class C shares of
the Limited Maturity portfolio are subject to a distribution fee of 0.20%. See
"Distribution Plans." The proceeds from account maintenance fees are used to
compensate Merrill Lynch for providing continuing account maintenance
activities.     
 
  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 CDSC and the distribution fee are paid to the Distributor
and are used in whole or in part by the Distributor to defray the expenses of
dealers (including Merrill Lynch) related to providing distribution-related
services to the Fund in connection with the sale of the Class B and Class C
shares, such as the payment of compensation to financial consultants for
selling Class B and Class C shares, from its 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. Approximately ten years after issuance, Class B of a
Portfolio shares will convert automatically into Class D shares of that
Portfolio, which are subject to an account maintenance fee but 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 onto the holding period
for the shares acquired.
 
                                       36
<PAGE>
 
  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 fee are used to compensate Merrill Lynch for providing continuing
account maintenance activities. Class B shareholders on the Fund exercising the
exchange privilege described under "Shareholder Services--Exchange Privileges"
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 Charge--Class B Shares. Class B shares of the
Insured and National Portfolios redeemed within four years of purchase for the
National and Insured Portfolios and Class B shares of the Limited Maturity
Portfolio redeemed within one year 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 CDSC will be imposed on increases in net asset value above the initial
purchase price. In addition, no CDSC will be assessed on the redemption of
shares received upon the reinvestment of dividends or capital gains
distributions.
 
  The following table sets forth the rates of the contingent deferred sales
charge on Class B shares applicable for the period starting October 21, 1994:
<TABLE>
<CAPTION>
                                                            CONTINGENT DEFERRED
         INSURED OR                                          SALES CHARGE AS A
    NATIONAL PORTFOLIO:                                        PERCENTAGE OF
    YEAR SINCE PURCHASE                                        DOLLAR AMOUNT
        PAYMENT MADE                                         SUBJECT TO 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>
 
<TABLE>
<CAPTION>
                                                            CONTINGENT DEFERRED
      LIMITED MATURITY                                       SALES CHARGE AS A
         PORTFOLIO:                                            PERCENTAGE OF
    YEAR SINCE PURCHASE                                        DOLLAR AMOUNT
        PAYMENT MADE                                         SUBJECT TO CHARGE
    -------------------                                     -------------------
       <S>                                                  <C>
       0-1.................................................        1.0%
       1 and thereafter....................................        0.0%
</TABLE>
 
  In determining whether a contingent deferred sales charge is applicable to a
redemption, the calculation will be made in a manner that results in the lowest
possible applicable rate being charged. Therefore, with respect to the Insured
and National Portfolios, 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
applicable four-year period. It will be assumed, with respect to the Limited
Maturity Portfolio, that the redemption is of shares held for over one year or
shares acquired pursuant to reinvestment of dividends or distributions. 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.
 
 
                                       37
<PAGE>
 
   
  To provide an example, assume an investor purchased 100 Class B shares of
the Insured Portfolio at $10 per share (at a cost of $1,000) and in the third
year after purchase, the net asset value per share is $12 and, during such
time, the investor has acquired 10 additional shares upon dividend
reinvestment. If at such time the investor makes his or her first redemption
of 50 shares (proceeds of $600), 10 shares will not be subject to charge
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 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 for shares purchased on or after October 21,
1994).     
   
  In the event that Class B shares are exchanged by certain retirement plans
for Class A shares in connection with a transfer to the MFA program, the time
period that such Class A shares are held in the MFA program will be included
in determining the holding period of Class B shares reacquired upon
termination of participation in the MFA program (see "Shareholder Services --
 Exchange Privilege").     
 
  The Class B CDSC is waived on redemptions of shares following the death or
disability (as defined in the Internal Revenue Code) of a shareholder.
 
  The Class B CDSC also is waived on redemptions of shares placing purchase
orders through Merrill Lynch Blueprint SM Program. Additional information
concerning the waiver of the Class B CDSC is set forth in the Statement of
Additional Information.
 
  The CDSC is also waived for any Class B shares that were acquired and held
at the time of the redemption in an Employee Access Account available through
employers providing eligible 401(K) plans.
   
  For the fiscal year ended June 30, 1996, the Distributor received $1,911,883
in CDSCs with respect to redemptions of Class B shares, amounting to
$1,033,602, $771,851, and $106,430 in the Insured, National and Limited
Maturity Portfolios, respectively, all of which were paid to Merrill Lynch.
    
  Contingent Deferred Sales Charges--Class C Shares. Class C shares which 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.
 
  The following table sets forth the rates of the contingent deferred sales
charge on the Class C shares of the Insured, National and Limited Maturity
Portfolios:
 
<TABLE>
<CAPTION>
                                                             CONTINGENT DEFERRED
                                                              SALES CHARGE AS A
                                                                PERCENTAGE OF
                        YEAR SINCE PURCHASE                     DOLLAR AMOUNT
                           PAYMENT MADE                       SUBJECT TO CHARGE
                        -------------------                  -------------------
       <S>                                                   <C>
       0-1..................................................         1.0%
       thereafter...........................................         0.0%
</TABLE>
 
  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
 
                                      38
<PAGE>
 
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.
   
  For the fiscal year ended June 30, 1996, the Distributor received $15,842 in
CDSCs with respect to redemptions of Class C shares, amounting to $7,257,
$6,455 and $2,130 in the Insured, National and Limited Maturity Portfolios,
respectively, all of which were paid to Merrill Lynch.     
   
  Conversion of Class B Shares to Class D Shares. After approximately ten years
(the "Conversion Period"), Class B shares of a Portfolio will be converted
automatically into Class D shares of the relevant Portfolio. Class D shares are
subject to an ongoing account maintenance fee of 0.25% (in the case of Insured
Portfolio and National Portfolio) and 0.10% (in the case of the Limited
Maturity Portfolio) 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 onto
the holding period for the shares acquired.
   
  The Conversion Period is modified for retirement plan investors who
participate in the MFA program. While participating in the MFA program, such
investors will hold Class A shares. If these Class A shares were acquired
through exchange of Class B shares (see "Shareholder Services--Exchange
Privilege"), then the holding period for such Class A shares will be "tacked"
to the holding period for the Class B shares     
 
                                       39
<PAGE>
 
   
originally held for purposes of calculating the Conversion Period of Class B
shares acquired upon termination of participation in the MFA program.     
 
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 Investment Company Act (each a
"Distribution Plan") with respect to the account maintenance and/or
distribution fees paid by the Fund to the Distributor with respect to such
classes. The 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.
 
  The Distribution Plans for Class B, Class C and Class D shares each provide
that the Fund pays the Distributor an account maintenance fee relating to the
shares of the relevant class of a Portfolio, accrued daily and paid monthly,
at the annual rate of 0.25% (in the case of the Class B, Class C and Class D
shares of the Insured Portfolio and the National Portfolio) and 0.15% (in the
case of Class B and Class C shares of the Limited Maturity) and 0.10% (in the
case of the Class D shares of the Limited Maturity Portfolio) of the average
daily net assets of the Portfolio 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 of a Portfolio, accrued daily and paid monthly, at the
annual rate of 0.50% and 0.55% for the Class B and Class C shares,
respectively, of the Insured and National Portfolios and 0.20% for the Class B
and Class C shares of the Limited Maturity Portfolio of the average daily net
assets of the Portfolio 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 Portfolio.
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 fees 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.
   
  Prior to July 6, 1993, the Fund paid the Distributor an ongoing distribution
fee, accrued daily and paid monthly, at the annual rate of 0.75% (in the case
of the Insured Portfolio and National Portfolio) and 0.35% (in the case of the
Limited Maturity Portfolio) of the average daily net assets of the Class B
shares of the respective Portfolio's (the "Prior Plan") to compensate the
Distributor and Merrill Lynch for providing account maintenance and
distribution-related activities and services to Class B shareholders. The fee
rate payable and the services provided under the Prior Plan are identical to
the aggregate fee rate payable and the services provided under the
Distribution Plan, the difference being that the account maintenance and
distribution services have been unbundled. For the fiscal year ended June 30,
1996, the Insured, National, and Limited Maturity Portfolios paid the
Distributor $5,668,976, $3,059,804 and $307,014, respectively     
 
                                      40
<PAGE>
 
   
pursuant to the Class B Distribution Plan (based on average net assets subject
to the Class B Distribution Plan of approximately $760 million, $410.2 million
and $88.5 million, respectively) all of which were 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 June 30, 1996 the
Insured, National, and Limited Maturity Portfolios paid the Distributor
$105,361, $72,516 and $2,182, respectively, pursuant to the Class C
Distribution Plan (based on average net assets subject to the Class C
Distribution Plan of approximately $13.2 million, $9.1 million and $762,063,
respectively) all of which were 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 June 30, 1996, the Insured, National
and Limited Maturity Portfolios paid the Distributor $93,721, $77,432 and
$16,263 respectively, pursuant to the Class D Distribution Plan (based on
average net assets subject to the Class D Distribution Plan of approximately
$37.7 million, $31.1 million and $16.5 million, respectively) all of which were
paid to Merrill Lynch for providing account maintenance activities in
connection with Class D shares.     
          
  At September 30, 1996 the net assets of the Insured, National, and Limited
Maturity Portfolios subject to the Class B Distribution Plan aggregated $706.4
million, $400.9 million and $66.6 million, respectively. At this asset level,
the annual fee payable pursuant to the Class B Distribution Plan would
aggregate approximately $5.3 million, $3.0 million and $233,243, respectively.
At September 30, 1996 the net assets of the Insured, National and Limited
Maturity Portfolios subject to the Class C Distribution Plan aggregated $20.1
million, $16.0 million and $165,332, respectively. At this asset level, the
annual fee payable pursuant to the Class C Distribution Plan would aggregate
approximately $160,864, $127,670 and $579, respectively. At September 30, 1996
the net assets of the Insured, National and Limited Maturity Portfolios subject
to the Class D Distribution Plan aggregated $47.9 million, $47.1 million and
$17.1 million, respectively. At this asset level, the annual fee payable
pursuant to the Class D Distribution Plan would aggregate approximately
$119,819, $117,729 and $17,098, respectively. The Class B and Class C
Distribution Plans are designed to permit an investor to purchase Class B and
Class C shares through dealers without assessment of a front-end sales load and
at the same time permit the dealer to compensate its financial consultants in
connection with the sale of the Class B shares. In this regard, the purpose and
function of the distribution fee and the CDSC are the same as those of the
initial sales charge with respect to the Class A shares and Class D shares of
the Portfolio in that the deferred sales charges provide for the financing of
the distribution of such Portfolio's Class B shares.     
 
  The payments under the Distribution Plans are based on a percentage of
average daily net assets attributable to the relevant shares regardless of the
amount of expenses incurred and, accordingly, distribution-related revenues
from Distribution Plans may be more or less than distribution-related expenses.
Information with respect to the distribution-related revenues and expenses
incurred by the Distributor and Merrill Lynch is presented to the directors 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 account maintenance
fees, the distribution fees, the contingent deferred sales charges and certain
other related revenues, and expenses consist of financial consultant
compensation, branch office and regional operation center selling and
transaction procession expenses, advertising, sales promotion and marketing
expenses, corporate overhead and interest expense. On the direct expense and
revenue/cash basis, revenues consist of the account maintenance fees,
distribution fees, the contingent deferred sales charges and expenses consist
of financial
 
                                       41
<PAGE>
 
   
consultant compensation. As of December 31, 1995, the last date for which fully
allocated accrual data is available, the fully allocated accrual revenues
incurred by the Distributor and Merrill Lynch since October 21, 1988
(commencement of operations) with respect to Class B shares of the Insured
Portfolio exceeded fully allocated expenses for that period by $92,000 (0.01%
of the Insured Portfolio's net assets at that date), and the fully allocated
accrual expenses incurred by the Distributor and Merrill Lynch during that
period with respect to Class B shares of the National Portfolio exceeded fully
allocated accrual revenues for that period by $1,398,000 (0.33% of the National
Portfolio's net assets at that date). The fully allocated accrual revenues
incurred by the Distributor and Merrill Lynch during the period from November
2, 1992 to December 31, 1995 with respect to Class B shares of the Limited
Maturity Portfolio exceeded expenses by $157,000 (0.19% of the Limited Maturity
Portfolio's net assets at that date). As of June 30, 1996, direct cash revenues
received with respect to the Insured Portfolio for the period since October 21,
1988 (commencement of operations) exceeded direct cash expenses incurred with
respect to the Insured Portfolio by $25,511,024 (3.53% of the Insured
Portfolio's net assets at that date), and direct cash revenues received with
respect to the National Portfolio for the same period exceeded direct cash
expenses incurred with respect to the National Portfolio by $11,710,468 (2.93%
of the National Portfolio's net assets at that date). As of June 30, 1996,
direct cash revenues received with respect to the Limited Maturity Portfolio
for the period since November 2, 1992 (commencement of operations) exceeded
direct cash expenses incurred with respect to the Limited Maturity Portfolio by
$1,355,039 (1.91% of the Limited Maturity Portfolio's net assets at that date).
       
  With respect to Class C shares, from commencement of operations on October
21, 1994 to June 30, 1996 direct cash revenues of the Insured Portfolio,
exceeded direct cash expenses by $52,910 (.28% of the Insured Portfolio net
assets at that date); direct cash revenues received with respect to the
National Portfolio exceeded direct cash expenses by $31,723 (.24% of the
National Portfolio net assets at that date); direct cash expenses received with
respect to the Limited Maturity Fund exceeded direct cash revenues by $1,780
(1.89% of the Limited Maturity Portfolio net assets at that date.     
 
  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 the Class B, Class C and Class D shares, and there is no
assurance that the Board of Directors of the Fund will approve the continuation
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 Directors will be asked to take into consideration
expenses incurred in connection with the account maintenance and/or
distribution of each Class of a Portfolio separately. The initial sales
charges, the account maintenance fee, the distribution fee and/or the CDSCs
received with respect to the one class of a Portfolio will not be used to
subsidize the sale of shares of another class of the same Portfolio or of any
class of another Portfolio. 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 to Class D Shares."
 
LIMITATIONS ON THE PAYMENT OF DEFERRED SALES CHARGES
 
  The maximum sales charge rule in the Rules of Fair Practice of the National
Association of Securities Dealers, Inc. ("NASD") imposes a limitation on
certain asset-based sales charges such as the Fund's distribution fee and the
CDSC borne by the Class B and Class C but not the account maintenance fees. The
maximum sales charge rule is applied separately to each class and Portfolio. As
applicable to a Portfolio, the
 
                                       42
<PAGE>
 
   
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 of that Portfolio, computed separately (defined to
exclude shares issued pursuant to dividend reinvestments and exchanges), plus
(2) interest on the unpaid balance for the respective classes, 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 charge 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 fees. 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.     
 
                              REDEMPTION OF SHARES
 
  The Fund is required to redeem for cash all shares of each Portfolio upon
receipt of a written request in proper form. The redemption price is the net
asset value per share of the Portfolio next determined after the initial
receipt of proper notice of redemption. Except for any contingent deferred
sales load which 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 declared
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 relevant Portfolio at such time. If a shareholder
redeems all of the shares in his account, he will receive, in addition to the
net asset value of the shares redeemed, a separate check representing all
dividends declared but unpaid. If a shareholder redeems a portion of the shares
in his account, the dividends declared but unpaid on the shares redeemed will
be distributed on the next dividend payment date. As set forth below, special
procedures are available pursuant to which shareholders may redeem by check.
 
REDEMPTION
 
  A shareholder wishing to redeem shares may do so 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 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 the
certificate(s) for the shares to be redeemed. The notice in either event
requires the signature(s) of all persons in whose name(s) the shares are
registered, signed exactly as their name(s) appear on the Transfer Agent's
register or on the certificate(s), as the case may be. The signature(s) on the
redemption request must be guaranteed by an "eligible guarantor institution" as
such is defined in Rule 17Ad-15 under the Securities Exchange Act of 1934, the
existence and validity of which
 
                                       43
<PAGE>
 
   
may be verified by the Transfer Agent through the use of industry publications.
Notarized signatures are not sufficient. Examples of eligible guarantor
institutions include most commercial banks and other broker dealers (including
for example, Merrill Lynch branch offices). Information regarding other
financial institutions which qualify as "eligible guarantor institutions" may
be obtained from the Transfer Agent. 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, payment will be mailed within seven days of receipt of a
proper notice of redemption.     
 
  At various times the Fund may be requested to redeem shares of a Portfolio
for which it has not yet received good payment. The Fund may delay or cause to
be delayed the mailing of a redemption check until such time, not exceeding ten
days, as it has assured itself that good payment (e.g., cash or certified check
drawn on a United States bank) has been collected for the purchase of such
shares. Normally this delay will not exceed ten days.
 
REPURCHASE
 
  The Fund will also repurchase shares of each Portfolio through a
shareholder's listed securities dealer. The Fund will normally accept orders to
repurchase 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 New York Stock Exchange on the day received and is
received by the Fund from the dealer not later than 4:30 P.M., New York City
time, on the same day. Dealers have the responsibility of submitting such
repurchase requests to the Fund not later than 4:30 P.M., New York City time,
in order to obtain that day's closing price. These repurchase arrangements are
for the convenience of shareholders and do not involve a charge by the Fund
(other than any applicable CDSC); however, securities dealers may impose a
charge on the shareholder for transmitting the notice of repurchase to the
Fund. Merrill Lynch may charge its customers a processing fee (currently $4.85)
to confirm a repurchase of shares. Redemptions directly through the Fund's
Transfer Agent are not subject to the processing fee. The Fund reserves the
right to reject any order for repurchase. The exercise of this right of
rejection might adversely affect shareholders seeking redemption through the
repurchase procedure.
 
  For shareholders redeeming through their listed securities dealer, payment
for full and fractional shares will be made by the securities dealer 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
   
  As described in further detail in the Statement of Additional Information,
holders of Class A or Class D shares of any of the three Portfolios who have
redeemed their shares have a one-time privilege to reinstate their accounts by
purchasing Class A or Class D shares of the same Portfolio, and class, as the
case may be, in which they had invested 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     
 
                                       44
<PAGE>
 
   
the investor's Merrill Lynch Financial Consultant within 30 days after the date
the request for redemption was accepted by the Transfer Agent or 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.     
 
                       DIVIDENDS, DISTRIBUTIONS AND TAXES
 
DIVIDENDS AND DISTRIBUTIONS
 
  The net investment income of each Portfolio is declared as dividends daily
immediately prior to the determination of the net asset value of each Portfolio
on that day. The net investment income of each Portfolio for dividend purposes
consists of interest earned on portfolio securities, less expenses, in each
case computed since the most recent determination of net asset value. Expenses
of each Portfolio, including the advisory fee and Class B, Class C and Class D
account maintenance and Class B and Class C distribution fees (if applicable),
are accrued daily. Dividends of net investment income are declared daily and
reinvested monthly in the form of additional full and fractional shares of each
Portfolio at net asset value unless the shareholder elects to receive such
dividends in cash. The per share dividend distributions on each class of shares
of each of the three Portfolios will be reduced as a result of any account
maintenance, distribution and transfer agency fees applicable to that class.
Shares will accrue dividends as long as they are issued and outstanding. Shares
are issued and outstanding as of the settlement date of a purchase order to the
settlement date of a redemption order.
 
  Net realized capital gains, if any, are declared and distributed to the
Fund's shareholders at least annually. Capital gains distributions will be
automatically reinvested in shares unless the shareholder elects to receive
such distributions in cash.
 
  See "Shareholder Services--Automatic Reinvestment of Dividends and Capital
Gains Distributions" for information as to how to elect either dividend
reinvestment or cash payments. Any 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 any Portfolio or received in cash.
 
FEDERAL INCOME TAXES
 
  Each Portfolio of the Fund generally will be treated as a separate
corporation for federal income tax purposes. Each Portfolio has qualified and
expects to continue to qualify for the special tax treatment afforded regulated
investment companies under the Internal Revenue Code of 1986, as amended (the
"Code"). If each Portfolio qualifies for that tax treatment, it will not be
subject to federal income tax on that part of its net ordinary income and net
realized long-term capital gains which it distributes to its shareholders.
 
  Each Portfolio has qualified and expects to continue to qualify to pay
"exempt-interest" dividends as defined in the Code. If it so qualifies,
dividends or any part thereof (other than any capital gain distributions) paid
by the Portfolio which are attributable to interest on tax-exempt obligations
and designated by the Portfolio as exempt-interest dividends in a written
notice mailed to the Portfolio's shareholders within sixty days after the close
of its taxable year may be treated by shareholders for all purposes as items of
interest excludable from their gross income under Section 103(a) of the Code.
The recipient of tax-exempt income is
 
                                       45
<PAGE>
 
required to report such income on his federal income tax return. However, a
shareholder is advised to consult his tax adviser with respect to whether
exempt-interest dividends retain the exclusion under Section 103(a) if such
shareholder would be treated as a "substantial user" under Section 147(a)(1)
with respect to some or all of the tax-exempt obligations held by the
Portfolio. The Code provides that interest on indebtedness incurred or
continued to purchase or carry shares of the Portfolio is not deductible to the
extent attributable to exempt-interest dividends. Also, any losses realized by
individuals who dispose of shares of the Fund within six months of their
purchase are disallowed to the extent of any exempt-interest dividends received
with respect to such shares.
 
  Each Portfolio may realize capital gains, which will constitute taxable
income. Any distributions designated as capital gain dividends, i.e., as being
made from the Portfolio's net long-term capital gains (whether from tax-exempt
or taxable obligations) in a written notice furnished annually to shareholders
are taxable to shareholders as long-term capital gains, regardless of a
shareholder's holding period for shares of the Portfolio. In addition, if,
after April 30, 1993, a Portfolio acquires tax-exempt obligations having market
discount (generally, obligations acquired for a price less than their principal
amount), any gain on the disposition or retirement of such obligations will be
treated as ordinary income to the extent of accrued market discount.
 
  Dividends paid by each Portfolio from its taxable income (i.e., interest on
money market securities) and distributions of net realized short-term capital
gains (whether from tax-exempt or taxable obligations) are taxable to
shareholders as ordinary income.
 
  Some shareholders may be subject to a 31% withholding tax ("backup
withholding") on reportable dividends, capital gains distributions and
redemption payments. Backup withholding is not required with respect to
dividends representing "exempt-interest." Generally, shareholders subject to
backup withholding will be those for whom no certified taxpayer identification
number is on file with the Fund or who, to the Fund's knowledge, have furnished
an incorrect number. When establishing an account, an investor must certify
under penalties of perjury that such number is correct and that he is not
otherwise subject to backup withholding.
 
  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.
 
  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.
 
  Individual shareholders of the Fund may be subject to alternative minimum tax
to the extent the Fund holds "private activity" bonds. The Fund expects that it
will hold private activity bonds; however, in general, an individual
shareholder filing a joint return who does not have any tax preference items
subject to the alternative minimum tax other than income received from the Fund
derived from private activity bonds would have to receive more than $45,000 of
such income from the Fund before becoming subject to the alternative minimum
tax.
 
                                       46
<PAGE>
 
  Exempt-interest dividends paid by the Fund, whether or not attributable to
private activity bonds, may increase a corporate shareholder's alternative
minimum taxable income. In addition, the payment of exempt- interest dividends
may increase a corporate shareholder's liability for the environmental tax
imposed on a corporation's alternative minimum taxable income (computed without
regard to either the alternative tax net operating loss deduction or the
environmental tax deduction) at a rate of $12 per $10,000 (0.12%) of
alternative minimum taxable income in excess of $2,000,000. The tax will be
imposed even if the corporation is not required to pay an alternative minimum
tax.
 
  The foregoing is a general and abbreviated summary of the applicable
provisions of the Code and Treasury Regulations currently in effect. For the
complete provisions, reference should be made to the pertinent Code sections
and the Treasury Regulations promulgated thereunder. The Code and these
Regulations are subject to change by legislative or administrative action
either prospectively or retroactively. The Statement of Additional Information
sets forth additional information regarding other tax aspects of investment in
the Fund.
 
  Ordinary income and capital gains dividends may also be subject to State and
local taxes.
 
STATE AND LOCAL TAXES
 
  Depending upon the extent of the Fund's activities in those states and
localities in which its offices are maintained or in which its agents or
independent contractors are located, the Fund may be subject to the tax laws of
such states or localities. In addition, the exemption of interest income for
federal income tax purposes does not necessarily result in exemption under the
income or other tax laws of any state or local taxing authority. The laws of
the several states and local taxing authorities vary with respect to the
taxation of such interest income, and each holder of shares of the Fund is
advised to consult his own tax adviser in that regard. The Fund will report
annually the percentage of interest income received by each Portfolio during
the preceding year on tax-exempt obligations, indicating, on a state-by-state
basis, the source of such income.
 
                             PORTFOLIO TRANSACTIONS
 
  No Portfolio has any obligation to deal with any dealer or group of dealers
in the execution of transactions in portfolio securities. Municipal Bonds and
money market securities in which each Portfolio invests are traded primarily in
the over-the-counter market. Where possible, each Portfolio 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 Fund to obtain the best net results taking into account such
factors as price (including the applicable dealer spread), the size, type and
difficulty of the transaction involved, the firm's general execution and
operational facilities, and the firm's risk in positioning the securities
involved and the provision of supplemental investment research by the firm.
While the Fund generally seeks reasonably competitive spreads or commissions,
the Fund will not necessarily be paying the lowest spread or commission
available. Municipal Bonds and money market securities are generally traded on
a net basis and do not normally involve either brokerage commissions or
transfer taxes. The cost of portfolio securities transactions of each Portfolio
consists primarily of dealer or underwriter spreads. Under the 1940 Act,
persons affiliated with the Fund, including Merrill Lynch, are prohibited from
dealing with the Fund as a principal in the purchase and sale of securities.
The Fund has obtained an exemptive order
 
                                       47
<PAGE>
 
permitting it to engage in certain principal transactions involving high-
quality short-term Municipal Bonds. In addition, the Fund may not purchase
Municipal Bonds from any underwriting syndicate of which Merrill Lynch is a
member except pursuant to procedures approved by the Board of Directors which
comply with rules adopted by the Securities and Exchange Commission. Affiliated
persons of the Fund may serve as its broker in over-the-counter transactions
conducted on an agency basis.
 
                              SHAREHOLDER SERVICES
 
  Each Portfolio offers a number of shareholder services designed to facilitate
investment in its shares at no extra cost to the investor. Below is a
description of these services. Full details as to each of these services and
copies of the various plans described below can be obtained from the Fund.
 
INVESTMENT ACCOUNT
   
  Each shareholder whose account is maintained with the Transfer Agent has an
Investment Account and will receive a statement, 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. After the
end of each year, shareholders will receive federal income tax information
regarding dividends and capital gain distributions. A shareholder may make
additions to his Investment Account at any time by purchasing shares at the
applicable public offering price either through a securities dealer which has
entered into a selected dealers agreement with the Distributor or by mail
directly to the Transfer Agent, acting as agent for the Distributor.     
 
  Shareholders also may maintain their accounts through Merrill Lynch. Upon the
transfer of shares out of a Merrill Lynch brokerage account, an Investment
Account in the transferring shareholder's name will be opened automatically,
without charge, at the 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.
 
  Share certificates are issued only for full shares and only upon the specific
request of the shareholder. 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.
 
AUTOMATIC INVESTMENT PLAN
 
  An Automatic Investment Plan is available whereby the Transfer Agent is
authorized through pre-authorized checks of $50 or more to charge the regular
bank account of the shareholder on a monthly basis
 
                                       48
<PAGE>
 
to provide systematic additions of shares of the Fund to the shareholder's
Investment Account. Shareholders whose positions in any Portfolio of the Fund
are maintained in a CMA(R) account may participate in the CMA Automated
Investment Program, through which investments in any Portfolio of the Fund may
be made on a regularly scheduled basis ranging from weekly to semiannually in
amounts of $100 or more.
 
AUTOMATIC REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS
 
  Unless specified instructions are given as to the method of payment of
monthly dividends and annual capital gains distributions, they will
automatically be reinvested in additional shares of the respective Portfolio.
Such reinvestment will be at the net asset value of the shares of the
respective Portfolio, without sales charge, as of the close of business on the
payable date of the dividend or distribution. 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 by the
Transfer Agent as soon as practicable after the payment date, which is the
last day of each month.
 
  A shareholder may at any time, by written notification to Merrill Lynch if
the shareholder's account is maintained with Merrill Lynch or by written
notification or by telephone (1-800-MER-FUND) to the Transfer Agent if the
shareholder's account is maintained with the Transfer Agent, elect to have
subsequent dividends or capital gains distributions, or both, paid in cash,
rather than reinvested, in which event payment will be mailed on or about the
payment date. Cash payments can also be directed 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
 
  As described in further detail in the Statement of Additional Information, a
holder of Class A or Class D shares of any of the three Portfolios may elect
to make systematic withdrawals from his or her Investment Account on either a
monthly or calendar quarterly basis.
 
EXCHANGE PRIVILEGES
 
  Shareholders of each class of shares of a Portfolio who have held all or
part of their shares in the Portfolio for at least 15 days may exchange their
shares for shares of certain other Portfolios of the Fund, or with certain
other MLAM-advised mutual funds.
 
  Under the Merrill Lynch Select Pricing SM System, Class A shareholders may
exchange Class A shares of a Portfolio for Class A shares of another Portfolio
or a second MLAM-advised mutual fund if the shareholder holds any Class A
shares of the other Portfolio or second fund in his account in which the
exchange is made at the time of the exchange or is otherwise eligible to
purchase Class A shares of the other Portfolio or second fund. If the Class A
shareholder wants to exchange Class A shares for shares of other Portfolio or
a second MLAM-advised mutual fund, and the shareholder does not hold Class A
shares of the other Portfolio or second fund in his account at that time of
the exchange and is not otherwise eligible to acquire Class A shares of the
other Portfolio or second fund, the shareholder will receive Class D shares of
the other Portfolio or second fund as a result of the exchange. Class D shares
also may be exchanged for Class A shares of another Portfolio or a second
MLAM-advised mutual fund at any time as long as, at the
 
                                      49
<PAGE>
 
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 other Portfolio or 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 of a Portfolio will be exchangeable with
shares of the same class of another Portfolio or other MLAM-advised mutual
funds. Class C shares of the Limited Maturity Portfolio are available only
through the Exchange Privilege.
 
  Shares of a Portfolio which are subject to a CDSC will be 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 Portfolio. 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 Portfolio is "tacked" to the holding period of the newly acquired
shares of the other fund or Portfolio.
 
  Class A, Class B, Class C and Class D shares also will be 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 a Portfolio exercising the exchange privilege will
continue to be subject to the CDSC schedule applicable to that Portfolio if
such schedule is higher than the CDSC schedule relating to the new Class B
shares. In addition, Class B shares of a Portfolio acquired through use of the
exchange privilege will be subject to the CDSC schedule applicable to that
Portfolio 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 for federal income
tax purposes. For further information, see "Shareholder Services--Exchange
Privileges" in the Statement of Additional Information.     
          
  The exchange privilege is modified with respect to certain retirement plans
which participate in the MFA program. Such retirement plans may exchange Class
B, Class C or Class D shares that have been held for at least one year for
Class A shares of the same fund on the basis of relative net asset values in
connection with the commencement of participation in the MFA program, i.e., no
CDSC will apply. The one-year holding period does not apply to shares acquired
through reinvestment of dividends. Upon termination of participation in the MFA
program, Class A shares will be re-exchanged for the class of shares originally
held. For purposes of computing any CDSC that may be payable upon redemption of
Class B or Class C shares so reacquired, or the Conversion Period for Class B
shares so reacquired, the holding period for the Class A shares will be
"tacked" to the holding period for the Class B or Class C shares originally
held. The Fund's exchange privilege is also modified with respect to purchases
of Class A and Class D shares by non-     
 
                                       50
<PAGE>
 
   
retirement plan investors under the MFA program. First, the initial allocation
of assets is made under the MFA program. Then, any subsequent exchange under
the MFA program of Class A or Class D shares of a MLAM-advised mutual fund for
Class A or Class D shares of the Fund will be made solely on the basis of the
relative net asset values of the shares being exchanged. Therefore, there will
not be a charge for any difference between the sales charge previously paid on
the shares of the other MLAM-advised mutual fund and the sales charge payable
on the shares of the Fund being acquired in the exchange under the MFA program.
    
                             ADDITIONAL INFORMATION
 
DETERMINATION OF NET ASSET VALUE
 
  The net asset value of the shares of all classes of each Portfolio is
determined once daily by FAM immediately after the declaration of dividends as
of 15 minutes after the close of business on the New York Stock Exchange
(generally 4:00 P.M., New York City time), on each day that the New York Stock
Exchange is open for trading. The net asset value per share is computed by
dividing the sum of the value of the portfolio securities held by each
Portfolio plus any cash or other assets minus all liabilities by the total
number of shares outstanding at such time, rounded to the nearest cent.
Expenses, including the investment advisory fees payable to FAM, account
maintenance and/or distribution fees payable to the distributor are accrued
daily.
 
  The per share net asset value of Class A shares of a Portfolio generally will
be higher than the per share net asset value of shares of the other classes of
that Portfolio, 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 and higher transfer agency 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 distribution 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 four
classes of a Portfolio will tend to converge (although not necessarily meet)
immediately after the payment of dividends or distributions, which will differ
by approximately the amount of expense accrual differentials among the classes.
 
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 the
Class A, Class B, Class C and Class D shares of the Portfolios in accordance
with formulas specified by the Securities and Exchange Commission.
 
  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
 
                                       51
<PAGE>
 
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
with respect to all shares of a Portfolio, 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 distribution fees, account
maintenance fees and any incremental transfer agency costs relating to a class
of shares will be borne exclusively by that class. The Fund will include
performance data for all classes of shares of the Portfolios in any
advertisement or information including performance data for such Portfolios.
 
  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
charge will not be included. 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. 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 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 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 ending
June 30, 1996 for National Portfolio Class A shares was 5.44%, 4.91% for Class
B shares, 4.87% for Class C shares and 5.20% for Class D shares. The yield for
the 30-day period ending June 30, 1996 for Insured Portfolio Class A shares was
4.94%, 4.39% for Class B shares, 4.34% for Class C shares and 4.70% for Class D
shares and for Limited Maturity Portfolio Class A shares was 3.86%, 3.54% for
Class B shares, 3.53% for Class C shares and 3.80% for Class D shares. The tax-
equivalent yield for the same period (based on a tax rate of 28%) for National
Portfolio Class A shares was 7.56%, 6.82% for the Class B shares, 6.76% for
Class C shares and 7.22% for Class D shares. The tax equivalent yield for the
same period (based on a tax rate of 28%) for Insured Portfolio Class A shares
was 6.86%, 6.10% for the Class B shares, 6.03% for Class C shares and 6.53% for
Class D shares. The tax equivalent yield for the same period (based on a tax
rate of 28%) for Limited Maturity Portfolio Class A shares was 5.36%, 4.92% for
Class B shares, 4.90% for Class C shares and 5.28% 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 Portfolio, the Portfolio's
operating expenses and the amount of realized and unrealized net capital gains
or losses during the period. The value of an investment in a Portfolio 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 that of the Standard &
Poor's 500 Composite Stock Price Index, the Value Line Composite Index, the Dow
Jones Industrial Average, or performance data
 
                                       52
<PAGE>
 
contained in publications such as Lipper Analytical Services, Inc., Morningstar
Publications, Inc., Money Magazine, U.S. News & World Report, Business Week,
CDA Investment Technology, Inc., Forbes Magazine or Fortune Magazine. As with
other performance data, performance comparisons should not be considered
indicative of the Fund's relative performance for any future period.
 
RATING INFORMATION
 
    Descriptions of Moody's Investors Service, Inc.'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 medium grade obligations; i.e.,
they are neither highly protected nor poorly secured. Interest payments and
principal security appear adequate for the present, but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and in
fact have speculative characteristics as well.     
   
  Ba--Bonds which are rated Ba are judged to have speculative elements; their
future cannot be considered as well assured. Often the protection of interest
and principal payments may be very moderate and thereby not well safeguarded
during both good and bad times over the future. Uncertainty of position
characterizes bonds in this class.     
   
  B--Bonds which are rated B generally lack characteristics of the desirable
investment. Assurance of interest and principal payments or of maintenance of
other terms of the contract over any long period of time may be small.     
   
  Caa--Bonds which are rated Caa are of poor standing. Such issues may be in
default or there may be present elements of danger with respect to principal or
interest.     
   
  Ca--Bonds which are rated Ca represent obligations which are speculative in a
high degree. Such issues are often in default or have other marked
shortcomings.     
   
  C--Bonds which are rated C are the lowest rated class of bonds, and issues so
rated can be regarded as having extremely poor prospects of ever attaining any
real investment standing.     
 
                                       53
<PAGE>
 
  Conditional Rating: Bonds for which the security depends upon the completion
of some act or the fulfillment of some condition are rated conditionally. These
are bonds secured by (a) earnings of projects under construction, (b) earnings
of projects unseasoned in operation experience, (c) rentals which begin when
facilities are completed, or (d) payments to which some other limiting
condition attaches. Parenthetical rating denotes probable credit stature upon
completion of construction or elimination of basis of condition.
 
  Rating Refinements: Moody's may apply numerical modifiers, 1, 2 and 3 in each
generic rating classification from Aa through B in its municipal bond rating
system. The modifier 1 indicates that the security ranks in the higher end of
its generic rating category; the modifier 2 indicates a mid-range ranking; and
a modifier 3 indicates that the issue ranks in the lower end of its generic
rating category.
 
  Short-term Notes: The four ratings of Moody's for short-term notes are MIG 1,
MIG 2, MIG 3 and MIG 4. MIG 1 denotes best quality. There is present strong
protection by established cash flows, superior liquidity support or
demonstrated broad-based access to the market for refinancing; MIG 2 denotes
high quality. Margins of protection are ample although not so large as in the
preceding group; MIG 3 denotes favorable quality. All security elements are
accounted for but there is lacking the undeniable strength of the preceding
grades. Liquidity and cash flow protection may be narrow and market access for
refinancing is likely to be less well established; MIG 4 denotes adequate
quality. Protection commonly regarded as required of an investment security is
present and although not distinctly or predominantly speculative, there is
specific risk.
 
                Descriptions of Moody's Commercial Paper Ratings
 
  Moody's Commercial Paper ratings are opinions of the ability to repay
punctually promissory obligations having an original maturity not in excess of
nine months. Moody's employs the following three designations, all judged to be
investment grade, to indicate the relative repayment capacity of rated issuers:
 
    Issuers rated Prime-1 (or related supporting institutions) have a
  superior capacity for repayment of short-term promissory obligations.
 
    Issuers rated Prime-2 (or related supporting institutions) have a strong
  capacity for repayment of short-term promissory obligations.
 
    Issuers rated Prime-3 (or related supporting institutions) have an
  acceptable capacity for repayment of short-term promissory obligations.
 
    Issuers rated Not Prime do not fall within any of the Prime rating
  categories.
 
    Descriptions of Standard & Poor's Ratings Group's Municipal Debt Ratings
 
  A Standard & Poor's municipal debt rating is a current assessment of the
creditworthiness of an obligor with respect to a specific obligation. This
assessment may take into consideration obligors such as guarantors, insurers,
or lessees.
 
  The debt rating is not a recommendation to purchase, sell or hold a security,
inasmuch as it does not comment as to market price or suitability for a
particular investor.
 
  The ratings are based on current information furnished by the issuer or
obtained by Standard & Poor's from other sources Standard & Poor's considers
reliable. Standard & Poor's does not perform an audit in connection with any
rating and may, on occasion, rely on unaudited financial information. The
rating may
 
                                       54
<PAGE>
 
be changed, suspended or withdrawn as a result of changes in, or unavailability
of, such information, or for other circumstances.
 
  The ratings are based, in varying degrees, on the following considerations:
 
I.Likelihood of default-capacity and willingness of the obligor as to the
timely payment of interest and repayment of principal in accordance with the
terms of the obligation;
 
II.Nature of and provisions of the obligation;
 
III. Protection afforded 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 creditor's rights.
 
<TABLE>
   <S>    <C>
   AAA    Debt rated "AAA" have the highest rating assigned by Standard & Poor's to a debt
          obligation. Capacity to pay interest and repay principal is extremely strong.
   AA     Debt rated "AA" have a very strong capacity to pay interest and repay principal
          and differs from the higher rated issues only in small degree.
   A      Debt rated "A" have a strong capacity to pay interest and repay principal al-
          though they are somewhat more susceptible to the adverse effects of changes in
          circumstances and economic conditions than debts in higher rated categories.
   BBB    Debt rated "BBB" are regarded as having an adequate capacity to pay interest and
          repay principal. Whereas they normally exhibit adequate protection parameters,
          adverse economic conditions or changing circumstances are more likely to lead to
          a weakened capacity to pay interest and repay principal for debt in this category
          than in higher rated categories.
   BB     Debt rated "BB," "B," "CCC" and "CC" are regarded, on balance, as predominantly
   B      speculative with respect to capacity to pay interest and repay principal in ac-
   CCC    cordance with the terms of the obligation. "BB" indicates the lowest degree of
   CC     speculation and "CC" the highest of speculation. While such debts will likely
          have some quality and protective characteristics, these are outweighed by large
          uncertainties or major risk exposures to adverse conditions.
   C      The rating "C" is reserved for income bonds on which no interest is being paid.
   D      Debt rated "D" is in default, and payment of interest and/or repayment of princi-
          pal is in arrears.
</TABLE>
 
  Plus (+) or Minus (-): The ratings from "AA" to "B" may be modified by the
addition of a plus or minus sign to show relative standing within the major
rating categories.
 
  Provisional Ratings: The letter "p" indicates that the rating is provisional.
A provisional rating assumes the successful completion of the project being
financed by the debt being rated and indicates that payment of debt service
requirements is largely or entirely dependent upon the successful and timely
completion of the project. This rating, however, while addressing credit
quality subsequent to completion of the project, makes no comment on the
likelihood of, or the risk of default upon failure of, such completion. The
investor should exercise his own judgment with respect to such likelihood and
risk.
 
<TABLE>
   <S>    <C>
   NR     Indicates that no rating has been requested, that there is insufficient informa-
          tion on which to base a rating or that Standard & Poor's does not rate a particu-
          lar type of obligation as a matter of policy.
</TABLE>
 
 
                                       55
<PAGE>
 
   Descriptions of Standard & Poor's Ratings Group'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 four categories, ranging from "A" for
the highest quality obligations to "D" for the lowest. The four categories are
as follows:
 
<TABLE>
   <S>    <C>
   A      Issues assigned this highest rating are regarded as having the greatest capacity
          for timely payment. Issues in this category are delineated with the numbers 1, 2
          and 3 to indicate the relative degree of safety.
   A-1    This designation indicates that the degree of safety regarding timely payment is
          very strong.
   A-2    Capacity for timely payment on issues with this designation is strong. However,
          the relative degree of safety is not as high as for issues designated "A-1."
   A-3    Issues carrying this designation have a satisfactory capacity for timely payment.
          They are, however, somewhat 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 an adequate capacity for timely pay-
          ment. However, such capacity may be damaged by changing conditions or short-term
          adversities.
   C      This rating is assigned to short-term debt obligations with a doubtful capacity
          for payment.
   D      This rating indicates that the issue is either in default or is expected to be in
          default upon maturity.
</TABLE>
 
  The commercial paper rating is not a recommendation to purchase or sell a
security. The ratings are based on current information furnished to Standard &
Poor's by the issuer or obtained by Standard & Poor's from other sources it
considers reliable. The ratings may be changed, suspended, or withdrawn as a
result of changes in or unavailability of, such information.
 
         Descriptions of Standard & Poor's Ratings Group's Note Ratings
 
  A Standard & Poor's note rating reflects the liquidity concerns 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  Very strong, or strong, capacity to pay principal and interest. Those
        issues determined to possess overwhelming safety characteristics will be
        given a plus (+) designation.

  SP-2  Satisfactory capacity to pay principal and interest.
 
  SP-3  Speculative capacity to pay principal and interest.
 
                                       56
<PAGE>
 
ORGANIZATION OF THE FUND
 
  The Fund, a Maryland corporation, is a diversified, open-end management
investment company that commenced operations on October 21, 1977. Prior to
September 21, 1979, the Fund consisted solely of the Insured Portfolio.
Currently, the Fund is comprised of three separate Portfolios: Insured
Portfolio, National Portfolio and Limited Maturity Portfolio.
 
  The authorized capital stock of the Fund consists of 3,850,000,000 shares of
Common Stock, divided into three series, each of which is divided into four
classes, having a par value of $0.10 per share. The shares of Insured Portfolio
Series Common Stock (500,000,000 Class A, 375,000,000 Class B shares,
375,000,000 Class C shares, 500,000,000 Class D shares authorized), High Yield
Portfolio Series Common Stock (375,000,000 Class A, 375,000,000 Class B shares,
375,000,000 Class C shares, 375,000,000 Class D shares authorized), which does
business under the name "National Portfolio," and Limited Maturity Portfolio
Series Common Stock (150,000,000 Class A, 150,000,000 Class B shares,
150,000,000 Class C shares, 150,000,000 Class D shares authorized) are divided
into four classes, designated Class A, Class B, Class C and Class D Common
Stock. Each Class A, Class B, Class C and Class D share of common stock of each
of the Portfolios represents an interest in the same assets of such Portfolio
and are identical in all respects to the shares of the other classes except
that the Class B, Class C and Class D shares bear certain expenses related to
the account maintenance associated with such shares, and Class B and Class C
shares bear certain expenses related to the distribution of such shares. Each
Class of shares of a Portfolio has exclusive voting rights with respect to
matters relating to account maintenance services and distribution expenditures
relative to that Portfolio, as applicable. Only shares of each respective
Portfolio are entitled to vote on matters concerning only that Portfolio. The
Fund has received an order from the Securities and Exchange Commission
permitting the issuance and sale of multiple classes of shares of the
Portfolios. The Directors of the Fund may classify and reclassify the shares of
the Fund into additional series or classes of Common Stock at a future date.
The creation of additional classes would require an additional order from the
Securities and Exchange Commission. There is no assurance that such an
additional order will be issued.
 
  Each issued and outstanding share is entitled to one vote and to participate
equally in dividends and distributions declared by the respective Portfolios
and in net assets of the respective Portfolios upon liquidation or dissolution
remaining after satisfaction of outstanding liabilities, except, as noted
above, the Class B, Class C and Class D shares of the Portfolios bear certain
expenses related to the distribution of such shares. The shares of each
Portfolio, when issued, will be fully paid and nonassessable, have no
preference, pre-emptive, conversion, exchange or similar rights. Shares have
the conversion rights described in this Prospectus. Holders of shares of any
Portfolio are entitled to redeem their shares as set forth under "Redemption of
Shares." Shares do not have cumulative voting rights, and the holders of more
than 50% of the shares of the Fund voting for the election of Directors can
elect all of the Directors of the Fund if they choose to do so and in such
event the holders of the remaining shares would not be able to elect any
Directors. Stock certificates will be issued by the Transfer Agent only on
specific request. Certificates for fractional shares are not issued in any
case. Shareholders are entitled to redeem their shares as set forth under
"Redemption of Shares."
 
CUSTODIAN
 
  The Bank of New York, 90 Washington Street, 12th Floor, New York, New York
10286, is the Fund's custodian.
 
                                       57
<PAGE>
 
COUNSEL AND AUDITOR
 
  Rogers & Wells, Counsel to the Fund, passes upon legal matters for the Fund
in connection with the shares offered by this Prospectus. Deloitte & Touche
LLP, independent auditors, are auditors of the Fund.
 
SHAREHOLDER REPORTS
 
  The Fund issues to its shareholders quarterly reports containing unaudited
financial statements and annual reports containing financial statements
examined by auditors approved annually by the Directors. 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, Florida 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
please call your Merrill Lynch Financial Consultant or Merrill Lynch Financial
Data Services, Inc. at 800-637-3863.     
 
ADDITIONAL INFORMATION
   
  This Prospectus does not contain all the information included in the
Registration Statement filed with the Securities and Exchange Commission under
the Securities Act of 1933 with respect to the securities offered hereby,
certain portions of which have been omitted pursuant to the rules and
regulations of the Securities and Exchange Commission. The Statement of
Additional Information, dated October 25, 1996, which forms a part of the
Registration Statement, is incorporated by reference into this Prospectus. The
Statement of Additional Information may be obtained without charge as provided
on the cover page of this Prospectus. The Registration Statement, including the
exhibits filed therewith, may be examined at the office of the Securities and
Exchange Commission in Washington, D.C.     
 
                                       58
<PAGE>
 
       MERRILL LYNCH MUNICIPAL BOND FUND -- AUTHORIZATION FORM (PART 1)
- -------------------------------------------------------------------------------
NOTE: THIS FORM MAY NOT BE USED FOR PURCHASES THROUGH THE MERRILL LYNCH
      BLUEPRINT SM PROGRAM. YOU MAY REQUEST A MERRILL LYNCH BLUEPRINT SM
      PROGRAM APPLICATION BY CALLING (800) 637-3766.
- -------------------------------------------------------------------------------
1. SHARE PURCHASE APPLICATION
  I, being of legal age, wish to purchase: (choose one)
Insured Portfolio [_] Class A shares  [_] Class B shares  [_] Class C shares  
                  [_] Class D shares
National Portfolio[_] Class A shares  [_] Class B shares  [_] Class C shares  
                  [_] Class D shares
Limited Maturity 
Portfolio         [_] Class A shares  [_] Class B shares  [_] Class D shares
 
of Merrill Lynch 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)
- -------------------------------------------------------------------------------
2. DIVIDEND AND CAPITAL GAIN DISTRIBUTION OPTIONS
 
                                          
     Ordinary Income Dividends            Long-Term Capital Gains
     Select  [_] Reinvest                 Select   [_] Reinvest
     One:    [_] Cash                     One:     [_] 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 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.
 
                                      59
<PAGE>
 
- -------------------------------------------------------------------------------
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
"Dividends, Distributions and Taxes -- Federal Income 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).......
 (IN THE CASE OF CO-OWNERS, A JOINT TENANCY WITH RIGHT OF SURVIVORSHIP WILL BE
                     PRESUMED UNLESS OTHERWISE SPECIFIED)
- -------------------------------------------------------------------------------
4. LETTER OF INTENTION -- CLASS A AND 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 Municipal Bond Fund or any other investment company with an initial
sales charge or deferred sales charge for which the Merrill Lynch Funds
Distributor, Inc. acts as distributor over the next 13-month period which will
equal or exceed:
 
    Insured
    Portfolio[_] $25,000 [_] $50,000 [_] $100,000 [_] $250,000  [_] $1,000,000
    National
    Portfolio[_] $25,000 [_] $50,000 [_] $100,000 [_] $250,000  [_] $1,000,000
    Limited Maturity
    Portfolio[_] $100,000 [_] $250,000  [_] $500,000   [_] $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 Municipal Bond
Fund Prospectus.
 
  I agree to the terms and conditions of the 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 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
                                         notify the Distributor of any
                                         purchases or sales made under a
                                         Letter of Intention, Automatic
                                         Investment Plan or Systematic
                                         Withdrawal Plan. We guarantee the
                                         shareholder's signature.     
- -                                  -
This form, when completed, should
be mailed to:
  Merrill Lynch Municipal Bond Fund
  c/o Merrill Lynch Financial Data Services, Inc.
 
  P.O. Box 45289                         
                                         .....................................
  Jacksonville, FL 32232-5289            
                                                Dealer Name and Address
                                        
                                        [_][_][_]   [_][_][_][_] .............
                                        Branch Code F/C No.      F/C Last Name
 
                                         By: .................................
                                            Authorized Signature of Dealer
 
                                        [_][_][_]   [_][_][_][_]
                                        Dealer's Customer A/C No.
 
                                      60
<PAGE>
 
- -------------------------------------------------------------------------------
       MERRILL LYNCH MUNICIPAL BOND FUND -- AUTHORIZATION FORM (PART 2)
- -------------------------------------------------------------------------------
 
1. ACCOUNT REGISTRATION
 
 
Name of Owner......................          [                     ]
 
                                             Social Security No. or
Name of Co-Owner (if any)..........          Taxpayer Identification
                                                     Number
 
Address............................        Account Number ....................
                                           (if existing account)
   ...............................
- -------------------------------------------------------------------------------
 
2. SYSTEMATIC WITHDRAWAL PLAN -- CLASS A AND D SHARES ONLY (SEE TERMS AND
CONDITIONS IN THE STATEMENT OF ADDITIONAL INFORMATION)
 
  Minimum Requirements: $10,000 for monthly disbursements, $5,000 for
quarterly, of [_] Class A or [_] Class D of the Insured Portfolio, [_] Class A
or [_] Class D shares of the National Portfolio, or [_] Class A or [_] Class D
shares of the Limited Maturity Portfolio in Merrill Lynch 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 HOW YOU WOULD LIKE YOUR WITHDRAWAL PAID TO YOU (CHECK ONE): [_] $
or [_]    % of the current value of [_] Class A 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.
 
                                      61
<PAGE>
 
- -------------------------------------------------------------------------------
 
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 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.
   
* Not available for the Limited Maturity Portfolio.     
 
                                           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 Municipal Bond Fund as             Bank Address......................... 
indicated below:                                                               
                                                                               
                                         City.....  State.....  Zip Code.....   
  Amount of each ACH debit $........
                                         As a convenience to me, I hereby
  Account number....................     request and authorize you to pay and
                                         charge to my account ACH debits       
 Please date and invest ACH debits       drawn on my account by and payable    
on the 20th of each month beginning      to Merrill Lynch Financial Data       
 .....................................    Services, Inc. I agree that your      
 ..............................(Month)    rights in respect to each such debit  
or as soon thereafter as possible.       shall be the same as if it were a     
                                         check drawn on you and signed         
  I agree that you are drawing these     personally by me. This authority is   
ACH debits voluntarily at my request     to remain in effect until revoked     
and that you shall not be liable for     personally by me in writing. Until    
any loss arising from any delay in       you receive such notice, you shall    
preparing or failure to prepare any      be fully protected in honoring any    
such debit. If I change banks or         such debit. I further agree that if   
desire to terminate or suspend this      any such debit be dishonored,         
program, I agree to notify you           whether with or without cause and     
promptly in writing. I hereby            whether intentionally or              
authorize you to take any action to      inadvertently, you shall be under no  
correct erroneous ACH debits of my       liability.                             
bank account or purchases of fund
shares including liquidating shares
of the Fund and credit my bank
account. I further agree that if a       ............   .....................  
check or 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.
 
                                      62
<PAGE>
 
                               INVESTMENT ADVISER
 
                             Fund Asset Management
                                 P.O. Box 9011
                        Princeton, New Jersey 08543-9011
 
                                  DISTRIBUTOR
 
                     Merrill Lynch Funds Distributor, Inc.
                                 P.O. Box 9081
                        Princeton, New Jersey 08543-9081
                                 (609) 282-2800
 
                                   CUSTODIAN
 
                              The Bank of New York
                        90 Washington Street, 12th Floor
                            New York, New York 10286
 
                                 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
 
                                 LEGAL COUNSEL
 
                                 Rogers & Wells
                                200 Park Avenue
                            New York, New York 10166
 
                              INDEPENDENT AUDITORS
 
                             Deloitte & Touche LLP
                                117 Campus Drive
                          Princeton, New Jersey 08540
<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 FUND, THE INVESTMENT ADVISER, 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 Tables.................................................................   2
Merrill Lynch Select Pricing SM System.....................................   8
Financial Highlights.......................................................  13
Investment Objective and Policies..........................................  19
Investment Policies of the Portfolios......................................  20
 Insured Portfolio.........................................................  20
 National Portfolio........................................................  21
 Limited Maturity Portfolio................................................  23
 Description of Municipal Bonds............................................  23
 Forward Commitments.......................................................  25
 Financial Futures Contracts and Derivatives...............................  25
 Investment Restrictions...................................................  27
Investment Adviser.........................................................  28
 Transfer Agency Services..................................................  29
 Code of Ethics............................................................  29
Directors..................................................................  30
Purchase of Shares.........................................................  30
 Initial Sales Charge Alternatives--Class A and Class D Shares.............  33
 Deferred Sales Charge Alternatives--Class B and Class C Shares............  36
 Distribution Plans........................................................  40
 Limitations on the Payment of Deferred Sales Charges......................  42
Redemption of Shares.......................................................  43
 Redemption................................................................  43
 Repurchase................................................................  44
 Reinstatement Privilege--Class A and Class D Shares.......................  44
Dividends, Distributions and Taxes.........................................  45
 Dividends and Distributions...............................................  45
 Federal Income Taxes......................................................  45
 State and Local Taxes.....................................................  47
Portfolio Transactions.....................................................  47
Shareholder Services.......................................................  48
 Investment Account........................................................  48
 Automatic Investment Plan.................................................  48
 Automatic Reinvestment of Dividends and Capital Gains Distributions.......  49
 Systematic Withdrawal Plans...............................................  49
 Exchange Privileges.......................................................  49
Additional Information.....................................................  51
 Determination of Net Asset Value..........................................  51
 Performance Data..........................................................  51
 Rating Information........................................................  53
 Organization of the Fund..................................................  57
 Custodian.................................................................  57
 Counsel and Auditor.......................................................  58
 Shareholder Reports.......................................................  58
 Additional Information....................................................  58
Authorization Form.........................................................  59
</TABLE>    
                                                              
                                                           Code #10051-1096     
 
[LOGO] MERRILL LYNCH

Merrill Lynch
Municipal Bond Fund, Inc

[ART]

PROSPECTUS

    
October 25, 1996      

Distributor:
Merrill Lynch
Funds Distributor, Inc.

This prospectus should be retained for future reference. 
 
 
<PAGE>
 
STATEMENT OF ADDITIONAL INFORMATION
   
OCTOBER 25, 1996     
 
                    MERRILL LYNCH MUNICIPAL BOND FUND, INC.
  P.O. BOX 9011, PRINCETON, NEW JERSEY 08543-9011 * PHONE NO. (609) 282-2800
 
                               ----------------
   
  Merrill Lynch Municipal Bond Fund, Inc. (the "Fund") is a professionally
managed, diversified, open-end investment company which seeks to provide
shareholders with as high a level of income exempt from federal income taxes
as is consistent with the investment policies of each of its Portfolios and
prudent investment management. The Fund is comprised of three separate
Portfolios: the Insured Portfolio, the National Portfolio and the Limited
Maturity Portfolio, each of which invests primarily in a diversified portfolio
of tax-exempt Municipal Bonds, principally consisting of state, municipal and
public authority securities.     
 
  The Fund is a series fund and is comprised of three separate Portfolios.
Each Portfolio is, in effect, a separate fund issuing its own shares. Pursuant
to the Merrill Lynch Select Pricing SM System, each Portfolio of the Fund
offers four classes of shares, each with a different combination of sales
charges, ongoing fees and other features except that Class C shares of the
Limited Maturity Portfolio are available only through the Exchange Privilege.
The Merrill Lynch Select Pricing 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.
 
                               ----------------
   
  This Statement of Additional Information of the Fund is not a prospectus and
should be read in conjunction with the Prospectus of the Fund (the
"Prospectus") dated October 25, 1996, which has been filed with the Securities
and Exchange Commission and is available upon oral or written request without
charge. Copies of the Prospectus can be obtained by calling or writing the
Fund at the above telephone number or address. This Statement of Additional
Information has been incorporated by reference into the Prospectus.     
 
                               ----------------
 
                  FUND ASSET MANAGEMENT -- INVESTMENT ADVISER
             MERRILL LYNCH FUNDS DISTRIBUTOR, INC. -- DISTRIBUTOR
 
                               ----------------
<PAGE>
 
                       INVESTMENT OBJECTIVE AND POLICIES
 
  Reference is made to "Investment Objective and Policies" in the Prospectus
for a discussion of the investment objective and policies of the Fund.
   
  At June 30, 1996, the average maturity of the Insured Portfolio, National
Portfolio and the Limited Maturity Portfolio was approximately 19.0 years, 23.4
years and 2.2 years, respectively.     
 
INSURANCE ON PORTFOLIO SECURITIES
 
  Reference is made to the discussion of the Insured Portfolio under
"Investment Policies of the Portfolios" in the Prospectus. As stated in the
Prospectus, the Fund has purchased from AMBAC Indemnity Corporation ("AMBAC"),
Municipal Bond Investors Assurance Corporation ("MBIA") and Financial Security
Assurance Inc. ("FSA") separate Mutual Fund Insurance Policies (the
"Policies").
 
  The Policies guarantee the payment of the principal at maturity and interest
on all Municipal Bonds which are purchased by the Insured Portfolio at a time
when they are eligible for insurance. Municipal Bonds are eligible for
insurance if they are, at the time of purchase by the Insured Portfolio,
identified separately or by category in qualitative guidelines furnished by
AMBAC, MBIA or FSA and are in compliance with the aggregate limitations on
amounts set forth in such guidelines. AMBAC, MBIA and/or FSA may withdraw
particular securities from the classifications of securities eligible for
insurance while continuing to insure previously acquired bonds of such
ineligible issues so long as they remain in the Insured Portfolio and may limit
the aggregate amount of each issue or category of municipal securities thereof.
The restrictions on investment imposed by the eligibility requirement of the
Policies may reduce the yield of the Insured Portfolio.
 
RISK FACTORS IN TRANSACTIONS IN JUNK BONDS
 
  The National Portfolio may invest in Municipal Bonds which are rated below
Baa by Moody's Investors Service Inc. ("Moody's") or below BBB by Standard &
Poor's Ratings Group ("Standard & Poor's") or which, in the Investment
Adviser's judgment, possess similar credit characteristics ("junk bonds"). See
"Additional Information--Rating Information" in the Prospectus for additional
information regarding ratings of debt securities. The Investment Adviser
considers the ratings assigned by Standard & Poor's or Moody's as one of
several factors in its independent credit analysis of issuers.
 
  Junk bonds are considered by Standard & Poor's and Moody's to have varying
degrees of speculative characteristics. Consequently, although junk bonds 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 junk bonds will be made only when,
in the judgment of the Investment Adviser, such securities provide attractive
total return potential relative to the risk of such securities, as compared to
higher quality debt securities. The National Portfolio will not invest in debt
securities in the lowest rating categories (those rated CC or lower by Standard
& Poor's or Ca or lower by Moody's) unless the Investment Adviser 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.
The National Portfolio
 
                                       2
<PAGE>
 
does not intend to purchase debt securities that are in default or which the
Investment Adviser believes will be in default.
   
  Issuers of junk bonds 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 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 of high-yield securities
may be more likely to experience financial stress, especially if such issuers
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 a period, 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 junk bonds because such
securities may be unsecured and may be subordinated to other creditors of the
issuer.     
 
  Junk bonds frequently have call or redemption features that would permit an
issuer to repurchase the security from the National Portfolio. If a call were
exercised by the issuer during a period of declining interest rates, the
National Portfolio likely would have to replace such called security with a
lower yielding security, thus decreasing the net investment income to the
National Portfolio and dividends to shareholders.
 
  The National Portfolio may have difficulty disposing of certain junk bonds
because there may be a thin trading market for such securities. Because not all
dealers maintain markets in all junk bonds, there is no established secondary
market for many of these securities, and the National Portfolio 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 junk
bonds does exist, it is generally 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 National Portfolio's ability to dispose of
particular issues when necessary to meet its 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 National Portfolio to obtain accurate market
quotations for purposes of valuing its portfolio. Market quotations are
generally available on many junk bonds 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 junk bonds acquired by the
National Portfolio will be purchased upon issuance, which may involve special
risks because the securities so acquired are new issues. In such instances the
National Portfolio 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 National Portfolio 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 junk bonds,
particularly in a thinly traded market. Factors adversely affecting the market
value of such securities are likely to affect adversely the National
Portfolio's net asset
 
                                       3
<PAGE>
 
value. In addition, the National Portfolio 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.
 
TRANSACTIONS IN FUTURES CONTRACTS
          
  The Insured Portfolio, the National Portfolio and the Limited Maturity
Portfolio (collectively, the "Portfolios") may engage in the purchase and sale
of futures contracts on an index of municipal bonds or on U.S. Treasury
securities, or options on such futures contracts, for hedging purposes only.
The Portfolios may sell such futures contracts in anticipation of a decline in
the value of municipal bonds held by them or may purchase such futures
contracts in anticipation of an increase in the cost of municipal bonds they
intend to acquire. The Portfolios also are authorized to purchase and sell
other financial futures contracts which in the opinion of management provide an
appropriate hedge for some or all of the Fund's portfolio securities.     
 
  Because of low initial margin deposits made upon the opening of a futures
position, futures transactions involve substantial leverage. As a result,
relatively small movements in the price of the futures contract can result in
substantial unrealized gains or losses. Because the Portfolios will engage in
the purchase and sale of financial 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 Portfolios or decreases in the price of
securities the Portfolios intend to acquire. Further, the Portfolios will
maintain cash, cash equivalents and high-grade securities with the Fund's
custodian, so that the amount segregated plus the initial margin equals the
value represented by the futures contract purchased by the Portfolios, thereby
ensuring that such transactions are actually unleveraged.
 
  Municipal bond index futures contracts commenced trading in June 1985, and it
is possible that trading in such futures contracts will be less liquid than
that in other futures contracts. The trading of futures contracts and options
thereon is subject to certain market risks, such as trading halts, suspensions,
exchange or clearing house equipment failures, government intervention or other
disruptions of normal trading activity, which could at times make it difficult
or impossible to liquidate existing positions.
 
  The liquidity of the market in futures contracts may be further adversely
affected by "daily price fluctuation limits" established by contract markets,
which limit the amount of a fluctuation in the price of a futures contract or
option thereon 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 positions at prices beyond the
limit. Prices of existing contracts have in the past moved the daily limit on a
number of consecutive trading days. The Portfolios will enter into a futures
position only if, in the judgment of the Investment Adviser, there appears to
be an actively traded market for such futures contracts.
 
  The successful use of transactions in futures contracts and options thereon
depends on the ability of the Investment Adviser correctly to forecast the
direction and extent of price movements of these instruments, as well as price
movements of the securities held by the Portfolios within a given time frame.
To the extent these price movements are not correctly forecast or move in a
direction opposite to that anticipated, the Portfolios 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, either Portfolio's total
return for such period may be less than if it had not engaged in the hedging
transaction. See "Additional Information--Description of Financial Futures
Contract" below for a further discussion of the risks of futures trading.
 
                                       4
<PAGE>
 
                            INVESTMENT RESTRICTIONS
 
  The Fund has adopted the following 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, including a majority of the shares of each Portfolio affected
(which for this purpose and under the Investment Company Act of 1940 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).
 
  Under the fundamental investment restrictions, none of the Portfolios of the
Fund may:
 
  1. Make any investment inconsistent with the Fund's classification as a
diversified company under the Investment Company Act.
 
  2. Invest more than 25% of its assets, taken at market value, in the
securities of issuers in any particular industry (excluding the U.S. Government
and its agencies and instrumentalities).
 
  3. Make investments for the purpose of exercising control or management.
 
  4. Purchase or sell real estate, except that to the extent permitted by
applicable law, each Portfolio of 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.
 
  5. Make loans to other persons, except that the acquisition of bonds,
debentures or other corporate debt securities and investments 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 each
Portfolio of 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.
 
  6. Issue senior securities to the extent such issuance would violate
applicable law.
   
  7. Borrow money, except that (i) each Portfolio of the Fund may borrow from
banks (as defined in the Investment Company Act) in amounts up to 33 1/3% of
its total assets (including the amount borrowed), (ii) each Portfolio of the
Fund may, to the extent permitted by applicable law, borrow up to an additional
5% of its total assets for temporary purposes, (iii) each Portfolio of the Fund
may obtain such short-term credit as may be necessary for the clearance of
purchases and sales of portfolio securities and (iv) each Portfolio of 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.     
 
 
                                       5
<PAGE>
 
  8. Underwrite securities of other issuers except insofar as a Portfolio of
the Fund technically may be deemed an underwriter under the Securities Act of
1933, as amended (the "Securities Act") in selling portfolio securities.
 
  9. Purchase or sell commodities or contracts on commodities, except to the
extent that a Portfolio of 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, none of the Portfolios of
the Fund may:
 
  a. Purchase securities of other investment companies, except to the extent
such purchases are permitted by applicable law.
 
  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."
   
  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 Directors of the Fund has otherwise determined to be liquid pursuant
to applicable law. Securities purchased in accordance with Rule 144A under the
Securities Act (a "Rule 144A Security") and determined to be liquid by the
Fund's Board of Directors are not subject to the limitations set forth in this
investment restriction.     
 
  d. Invest in warrants if, at the time of acquisition, its investments in
warrants, valued at the lower of cost or market value, would exceed 5% of the
Portfolio's net assets; included within such limitation, but not to exceed 2%
of the Portfolio's net assets, are warrants which are not listed on the New
York Stock Exchange or American Stock Exchange or a major foreign exchange. For
purposes of this restriction, warrants acquired by the Portfolio in units or
attached to securities may be deemed to be without value.
 
  e. Invest in securities of companies having a record, together with
predecessors, of less than three years of continuous operation, if more than 5%
of the Fund's total assets would be invested in such securities. This
restriction shall not apply to mortgage-backed securities, asset-backed
securities or obligations issued or guaranteed by the U.S. Government, its
agencies or instrumentalities.
 
  f. Purchase or retain the securities of any issuer, if those individual
officers and directors of the Fund, the officers and general partner of the
Investment Adviser, the directors of such general partner or the officers and
directors of any subsidiary thereof each owning beneficially more than one-half
of one percent of the securities of such issuer own in the aggregate more than
5% of the securities of such issuer.
 
  g. Invest in real estate limited partnership interests or interests in oil,
gas or other mineral leases, or exploration or development programs, except
that the Portfolio may invest in securities issued by companies that engage in
oil, gas or other mineral exploration or development activities.
 
 
                                       6
<PAGE>
 
  h. Write, purchase or sell puts, calls, straddles, spreads or combinations
thereof, except to the extent permitted in the Fund's Prospectus and Statement
of Additional Information, as they may be amended from time to time.
 
  Notwithstanding fundamental investment restriction (7) above, the Fund
currently does not intend to borrow amounts in any Portfolio in excess of 10%
of the total assets of such Portfolio, taken at market value, and then only
from banks as a temporary measure for extraordinary or emergency purposes such
as the redemption of Fund shares. In addition, the Fund will not purchase
securities while borrowings are outstanding.
 
                             MANAGEMENT OF THE FUND
 
DIRECTORS AND OFFICERS
 
  The directors and executive officers of the Fund, their ages and their
principal occupations for at least the last five years are set forth below.
Unless otherwise noted, the address of each director and officer is P.O. Box
9011, Princeton, New Jersey 08543-9011.
   
  Arthur Zeikel (64)--President and Director(1)(2)--President of Merrill Lynch
Asset Management, L.P. ("MLAM") (which term as used herein includes its
corporate predecessors) since 1977; President of Fund Asset Management, L.P.
("FAM") (which term as used herein includes its 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; Director of Merrill Lynch Funds Distributor, Inc. (the
"Distributor") since 1977.     
   
  Ronald W. Forbes (56)--Director(2)--1400 Washington Avenue, Albany, New York
12222. Associate Professor of Finance, School of Business, State University of
New York at Albany, Member, Task Force on Municipal Securities Markets,
Twentieth Century Fund; Consultant, Public Finance Banking, Shearson Lehman
Brothers, Inc.     
   
  Cynthia A. Montgomery (44)--Director(2)--Harvard Business School, Soldiers
Field Road, Boston, Massachusetts 20163. Professor, Harvard Business School
since 1989; Associate Professor, J.L. Kellogg Graduate School of Management,
Northwestern University from 1985 to 1989; Assistant Professor, Graduate School
of Business Administration, The University of Michigan from 1979 to 1985;
Director, UNUM Corporation since 1990 and Director of Newell Co. since 1995.
       
  Charles C. Reilly (65)--Director(2)--9 Hampton Harbor Road, Hampton Bays, New
York 11946. Adjunct Professor, Columbia University Graduate School of Business,
since 1990; Adjunct Professor, Wharton School, University of Pennsylvania,
1990; President and Chief Investment Officer of Versus Capital, Inc. from 1979
to 1990; Senior Vice President of Arnhold and S. Bleichroeder, Inc. from 1973
to 1990.     
   
  Kevin A. Ryan (64)--Director(2)--127 Commonwealth Avenue, Chestnut Hill,
Massachusetts 02167. Founder, current Director and Professor of The Boston
University Center for the Advancement of Ethics and Character; Professor of
Education at Boston University since 1982; formerly taught on the faculties of
The University of Chicago, Stanford University and Ohio State University.     
 
                                       7
<PAGE>
 
   
  Richard R. West (58)--Director(2)--Box 604 Genoa, Nevada 89411. Professor of
Finance since 1984 and Dean from 1984 to 1993, and currently Dean Emeritus of
New York University Leonard N. Stern School of Business Administration;
Director of Bowne & Co., Inc. (financial printers), Vornado, Inc. (real estate
holding company), Smith-Corona Corporation (manufacturer of typewriters and
word processors) and Alexander's Inc. (real estate company).     
   
  Terry K. Glenn (56)--Executive Vice President(1)(2)--Executive Vice President
of MLAM and FAM since 1983; Executive Vice President and Director of Princeton
Services since 1993; President of the Distributor since 1986 and Director
thereof since 1991; President of Princeton Administrators, L.P. since 1988.
       
  Vincent R. Giordano (52)--Senior Vice President(1)(2)--Senior Vice President
of the Investment Adviser and MLAM since 1984; portfolio manager of the
Investment Adviser since 1977 and Vice President from 1980 to 1984.     
   
  Donald C. Burke (36)--Vice President(2)--Vice President and Director of
Taxation of MLAM since 1990; employee of Deloitte & Touche LLP from 1982 to
1990.     
   
  Kenneth A. Jacob (45)--Vice President(1)(2)--Vice President of the Investment
Adviser since 1984 and portfolio manager since 1982; employed by the Investment
Adviser since 1978.     
   
  Gerald M. Richard (47)--Treasurer(1)(2)--Senior Vice President and Treasurer
of the Investment Adviser and MLAM since 1984; Senior Vice President and
Treasurer of Princeton Services since 1993; Vice President of the Distributor
since 1981 and Treasurer of the Distributor since 1984.     
   
  Peter J. Hayes (37)--Vice President(1)(2)--Vice President of MLAM since 1988.
       
  Walter O'Connor (35)--Vice President(1)(2)--Vice President of MLAM since
1993; Assistant Vice President of MLAM from 1991 to 1993; Assistant Vice
President of Prudential Securities from 1984 to 1991.     
          
  Mark B. Goldfus (50)--Secretary(2)--Vice President of FAM and MLAM since
1985.     
- --------
(1) Interested person, as defined in the Investment Company Act of 1940, of the
    Fund.
   
(2) Such a Director or officer is a Director or officer of certain other
    investment companies for which the Investment Adviser or MLAM acts as
    investment adviser.     
 
                                       8
<PAGE>
 
   
  The following table sets forth for the fiscal year ended June 30, 1996,
compensation paid by the Fund to the non-interested Directors and for the
calendar year ended December 31, 1995, the aggregate compensation paid by all
investment companies (including the Fund) advised by MLAM and its affiliate,
FAM ("MLAM/FAM Advised Funds") to the non-interested Directors:     
 
<TABLE>   
<CAPTION>
                                                                 AGGREGATE
                                              PENSION OR     COMPENSATION FROM
                                              RETIREMENT         FUND AND
                                            BENEFIT ACCRUED  MLAM/FAM ADVISED
                              COMPENSATION  AS PART OF FUND    FUNDS PAID TO
  DIRECTOR/TRUSTEE            FROM THE FUND     EXPENSE     TRUSTEE/DIRECTOR(1)
  ----------------            ------------- --------------- -------------------
<S>                           <C>           <C>             <C>
Ronald W. Forbes.............    $9,200          None            $147,100
Cynthia A. Montgomery........     9,200          None             147,100
Charles C. Reilly............    10,200          None             269,600
Kevin A. Ryan................     9,200          None             147,100
Richard R. West..............     9,200          None             294,600
</TABLE>    
- --------
          
(1) The Directors serve on the boards of MLAM/FAM Advised Funds as follows:
  Mr. Forbes (23 registered investment companies consisting of 36 portfolios);
  Ms. Montgomery (23 registered investment companies consisting of 36
  portfolios); Mr. Reilly (41 registered investment companies consisting of 54
  portfolios); Mr. Ryan (23 registered investment companies consisting of 36
  portfolios); and Mr. West (41 registered investment companies consisting of
  54 portfolios).     
   
  At September 30, 1996, the Directors and Officers of the Company as a group
(14 persons) owned an aggregate of less than 1% of the outstanding shares of
the Company. At such date Mr. Zeikel, a Director and Officer of the Company,
and the other officers of the Company owned less than 1% of the outstanding
shares of Common Stock of ML & Co.     
 
  The Fund has an Audit Committee consisting of all of the directors of the
Fund who are not interested persons of the Fund.
   
  Each director of the Fund who is not an officer or employee of ML & Co. or
its subsidiaries receives an annual fee of $4,000 plus $800 per meeting of the
Board of Directors attended and an annual fee of $2,000 for serving on the
Audit Committee. In addition, the Fund pays all Directors' actual out-of-
pocket expenses relating to attendance at meetings of the Board of Directors
of the Fund or of any committee thereof. Mr. Reilly is paid an additional
annual fee of $1,000 for serving as Chairman of the Audit Committee. For the
year ended June 30, 1996, fees and expenses paid to the unaffiliated directors
of the Fund aggregated $49,559. No officer or employee of ML & Co., Inc. or
its subsidiaries receives any compensation from the Fund for acting as a
director or officer of the Fund. The Fund requires no employees other than its
officers, all of whom are compensated by FAM or the Distributor.     
 
INVESTMENT ADVISORY ARRANGEMENTS
   
  FAM, a subsidiary of MLAM, an indirect subsidiary of Merrill Lynch & Co.,
Inc., acts as the investment adviser for the Fund and provides the Fund with
management services. While FAM is at all times subject to the direction of the
Board of Directors of the Fund, under the Investment Advisory Agreement, FAM
is responsible for the actual management of each Portfolio and constantly
reviews the holdings of each Portfolio in light of its own research analysis
and analyses from other relevant sources. The responsibility for making
decisions to buy, sell or hold a particular security rests with FAM. FAM
provides the portfolio managers for each Portfolio, who consider analyses from
various sources, make the necessary investment decisions and     
 
                                       9
<PAGE>
 
place transactions accordingly. FAM is also obligated to perform certain
administrative and management services for the Fund and is obligated to provide
all the office space, facilities, equipment and personnel necessary to perform
its duties under the Agreement.
 
  Securities held by the Fund may also be held by other funds for which FAM or
MLAM acts as an adviser or by investment advisory clients of MLAM. If purchases
or sales of securities for the Fund or other funds for which FAM or MLAM acts
as investment adviser or for their advisory clients arise for consideration at
or about the same time, transactions in such securities will be made, insofar
as feasible, for the respective funds and clients in a manner deemed equitable
to all. To the extent that transactions on behalf of more than one client of
the Investment Adviser or MLAM 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.
 
  Advisory Fee. As compensation for its services to the Portfolios, FAM
receives at the end of each month a fee with respect to each Portfolio at the
annual rates set forth below, which are based upon the average daily value of
the Fund's net assets. The rates are subject to reduction to the extent that
the aggregate of the average daily net assets of the three combined Portfolios
exceeds $250 million, $400 million, $550 million and $1.5 billion,
respectively. The reductions will be applicable to each Portfolio regardless of
size on a "uniform percentage" basis. Determination of the portion of the net
assets of each Portfolio to which the reduced rate is applicable is made by
multiplying the net assets of that Portfolio by the "uniform percentages,"
derived by dividing the amount by which the combined assets of all Portfolios
exceeds the various applicable breakpoints by such combined assets. In
addition, although under the Investment Advisory Agreement FAM is entitled to a
fee with respect to the Insured Portfolio at an annual rate of 0.375% when the
Fund's aggregate net assets exceed $1.5 billion, as reflected in the table
below, FAM has agreed to waive such fee in excess of an annual rate of 0.35%.
 
<TABLE>
<CAPTION>
                                                      RATE OF ADVISORY FEE
                                                  -----------------------------
                                                                       LIMITED
AGGREGATE OF AVERAGE DAILY NET ASSETS OF THE       INSURED  NATIONAL  MATURITY
THREE COMBINED PORTFOLIOS                         PORTFOLIO PORTFOLIO PORTFOLIO
- --------------------------------------------      --------- --------- ---------
<S>                                               <C>       <C>       <C>
Not exceeding $250 million......................    0.40 %    0.50 %    0.40 %
In excess of $250 million but not exceeding $400
 million........................................    0.375     0.475     0.375
In excess of $400 million but not exceeding $550
 million........................................    0.375     0.475     0.35
In excess of $550 million but not exceeding $1.5
 billion........................................    0.375     0.475     0.325
In excess of $1.5 billion.......................    0.35      0.475     0.325
</TABLE>
          
   For the year ended June 30, 1994, FAM received $11,040,540 from the Insured
Portfolio, $8,514,268 from the National Portfolio and $3,305,839 from the
Limited Maturity Portfolio as advisory fees. For the year ended June 30, 1995,
FAM received $9,408,013 from the Insured Portfolio, $7,415,203 from the
National Portfolio and $2,712,662 from the Limited Maturity Portfolio as
advisory fees. For the year ended June 30, 1996, FAM received $8,850,984 from
the Insured Portfolio, $7,014,416 from the National Portfolio and $1,899,352
from the Limited Maturity Portfolio as advisory fees.     
 
  Payment of Expenses. The Investment Advisory Agreement obligates FAM to
provide investment advisory services and to pay all compensation of and furnish
office space for officers and employees of the Fund connected with economic
research, investment research, trading and investment management of the
 
                                       10
<PAGE>
 
   
Fund, as well as the fees of all directors of the Fund who are affiliated
persons of Merrill Lynch & Co., Inc. or any of its subsidiaries. Each Portfolio
pays all other expenses incurred in its operation and a portion of the Fund's
general administrative expenses allocated on the basis of the asset size of the
respective Portfolios. Expenses that will be borne directly by the Portfolios
include redemption expenses, expenses of portfolio transactions, shareholder
servicing costs, portfolio insurance maintained and paid by the Insured
Portfolio, expenses of registering the shares under federal and state
securities laws, pricing costs (including the daily calculation of net asset
value), interest, certain taxes, charges of the Custodian and Transfer Agent
and other expenses attributable to a particular Portfolio. Expenses which will
be allocated on the basis of the size of the respective Portfolios include
directors' fees, legal expenses, state franchise taxes, auditing services,
costs of printing proxies, stock certificates, shareholder reports and
prospectuses (except to the extent paid by the Distributor), Securities and
Exchange Commission fees, accounting costs and other expenses properly payable
by the Fund and allocable on the basis of the size of the respective
Portfolios. Accounting services are provided for the Fund by FAM, and the Fund
reimburses FAM for its costs in connection with such services. During the year
ended June 30, 1996, the Fund reimbursed FAM $470,695 for such services.
Depending upon the nature of a lawsuit, litigation costs may be directly
applicable to the Portfolios or allocated on the basis of the size of the
respective Portfolios. The Board of Directors has determined that this is an
appropriate method of allocation of expenses. As required by the Distribution
Agreement, the Distributor will pay certain of the expenses of each Portfolio
incurred in connection with the offering of shares of each Portfolio, including
the expense of printing the prospectuses used in connection with the continuous
offering of shares by each Portfolio. See "Purchase of Shares--Distribution
Agreement" in the Prospectus.     
 
  Duration and Termination. Unless earlier terminated as described below, the
Investment Advisory Agreement will continue in effect from year to year if
approved annually (a) by the Board of Directors of the Fund or by a majority of
the outstanding voting shares of each Portfolio and (b) by a majority of the
Directors who are not parties to such contract or interested persons (as
defined in the Investment Company Act of 1940) of any such party. Such contract
terminates upon assignment and may be terminated without penalty on 60 days'
written notice at the option of either party thereto or by the vote of the
shareholders of the Fund.
 
  If the shareholders of any Portfolio fail to approve the continuance of the
Investment Advisory Agreement, the Investment Advisory Agreement will continue
in effect as to any other Portfolio if the shareholders of such Portfolio have
approved the contract.
 
                                       11
<PAGE>
 
                        DETERMINATION OF NET ASSET VALUE
 
  The net asset value of the shares of the Company is determined once daily
Monday through Friday as of 15 minutes after the close of business on the New
York Stock Exchange (generally, 4:00 P.M., New York City time), on each day
during which the New York Stock Exchange is open for trading. The New York
Stock Exchange is not open on New Year's Day, Presidents' Day, Good Friday,
Memorial Day, Independence Day, Labor Day, Thanksgiving Day and Christmas Day.
The net asset value per share is computed by dividing the sum of the value of
the portfolio securities held by each Portfolio 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
investment advisory and any account maintenance and/or distribution fees, are
accrued daily.
 
  The per share net asset value of the Class B, Class C and Class D shares of a
Portfolio generally will be lower than the per share net asset value of the
Class A shares of that Portfolio reflecting the daily expense accruals of the
account maintenance distribution and higher transfer agency fees applicable
with respect to the Class B, Class C and Class D shares and daily expense
accruals of the account maintenance fees applicable with respect to the Class D
shares. Moreover the per share net asset value of the Class B and Class C
shares generally will be lower than the per share net asset value of its Class
D shares reflecting the daily expense accruals of the distribution fees and
higher transfer agency fees applicable with respect to the Class B and Class C
shares. It is expected, however, that the per share net asset value of the four
classes of a Portfolio 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 differential among the classes.
 
  The Municipal Bonds and money market securities in which each Portfolio
invests are traded primarily in the over-the-counter markets and are valued at
the most recent bid price or yield equivalent as obtained from dealers that
make markets in such securities. Positions in futures contracts are valued at
closing prices for such contracts established by the exchange on which they are
traded on each day during which trading is conducted thereon. Assets for which
market quotations are not readily available are valued at fair value on a
consistent basis using methods determined in good faith by the Board of
Directors, including valuations furnished by a pricing service retained by the
Fund, which may utilize a matrix system for valuations.
   
  It is the intention of FAM, subject to guidelines established by the Board of
Directors of the Fund, to hold Insured Municipal Bonds in the Insured Portfolio
which are in default, or in significant risk of default, in the payment of
principal or interest until the default has been cured or the principal and
interest are paid by the issuer or the insurer. In accordance with such
guidelines, FAM will consider the following factors in determining the
effective value of Insured Municipal Bonds in the Insured Portfolio which are
in default, or in significant risk of default, in the payment of principal or
interest: (1) the market value of the bonds; (2) the market value of securities
of similar issuers whose securities carry similar interest rates; and (3) the
value of the insurance guaranteeing interest and principal payments. Absent
unusual or unforeseen circumstances, the value ascribed to the insurance
feature of the bonds would be the difference between the market value of the
bonds and the market value of securities of a similar nature which are not in
default or significant risk of default. It is the position of the Board of
Directors that this is a fair method of valuing the insurance feature and
reflects a proper valuation method in accordance with the provisions of the
Investment Company Act of 1940. This method of valuing securities will mean
that shareholders of the Insured Portfolio, whether they decide to redeem or
decide to retain their investment in the Insured Portfolio, will in normal
circumstances     
 
                                       12
<PAGE>
 
receive the benefit of the insurance. Because of the unusual circumstances
surrounding the bonds held in the Insured Portfolio which were in default at
the end of the Fund's last fiscal year, the insurance feature was valued in an
amount which, when combined with the market value of the bonds, resulted in the
bonds' having an effective value of par.
 
                             PORTFOLIO TRANSACTIONS
 
  Under the Investment Company Act of 1940, persons affiliated with the Fund
are prohibited from dealing with the Fund as a principal in the purchase and
sale of securities unless an exemptive order allowing such transactions is
obtained from the Securities and Exchange Commission. Since over-the-counter
transactions are usually principal transactions, affiliated persons of the
Fund, including Merrill Lynch, may not serve as a dealer in connection with
transactions with the Fund. However, the Fund has obtained an exemptive order
permitting it to engage in certain principal transactions involving high
quality short-term Municipal Bonds. Affiliated persons of the Fund may serve as
its broker 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 Investment Company Act in
order to seek to recapture underwriting and dealer spreads from affiliated
entities. The Directors have considered the possibilities of seeking to
recapture spreads for the benefit of the Fund and, after considering factors
deemed relevant, have made a determination not to seek such recapture at this
time. The Board will reconsider this matter from time to time.
   
  Under the Investment Company Act of 1940, the Fund may not purchase Municipal
Bonds from any underwriting syndicate of which Merrill Lynch is a member except
pursuant to an exemptive order or rules adopted by the Securities and Exchange
Commission. During the year ended June 30, 1994, the Fund purchased
$230,231,897 of Municipal Bonds in 77 transactions pursuant to an exemptive
order or such a rule. During the year ended June 30, 1995, the Fund purchased
$79,188,750 of Municipal Bonds in 20 transactions pursuant to an exemptive
order or such a rule. During the fiscal year ended June 30, 1996, the Fund did
not engage in any transactions pursuant to such order.     
 
  The Fund does not expect to use any particular dealer in the execution of
transactions for its Portfolios, but, subject to obtaining the best net
results, dealers who provide supplemental investment research (such as economic
data and market forecasts) to FAM may receive orders for transactions by any
Portfolio. Information so received will be in addition to and not in lieu of
the services required to be performed by FAM under its Investment Advisory
Agreement and FAM's expenses will not necessarily be reduced as a result of the
receipt of such supplemental information.
 
  FAM expects that the portfolio turnover rate for the Insured Portfolio and
the National Portfolio should not generally exceed 100%. Because of the short-
term nature of the Limited Maturity Portfolio, its turnover rate may be
substantially higher. In any particular year, however, market conditions could
result in portfolio activity of a Portfolio at a greater or lesser rate than
anticipated.
 
                                       13
<PAGE>
 
                               PURCHASE OF SHARES
 
  The Fund has entered into separate distribution agreements (the "Distribution
Agreements") with the Distributor in connection with the offering of each class
of shares of the three Portfolios. The Distribution Agreements obligate the
Distributor to pay certain expenses in connection with the offering of the
Fund's shares. After the prospectuses, statements of additional information and
periodic reports have been prepared, set in type and mailed to shareholders,
the Distributor pays for the printing and distribution of copies thereof used
in connection with the offering to dealers and investors. The Distributor also
pays for other supplementary sales literature and advertising costs. The
Distribution Agreements are subject to the same renewal requirements and
termination provisions as the Investment Advisory Agreement described above.
 
ALTERNATIVE SALES ARRANGEMENTS
 
  The Fund is a series fund comprised of three separate Portfolios. All three
Portfolios are divided into four classes of shares under the Merrill Lynch
Select PricingSM System. Class A and Class D shares of the three Portfolios are
sold to investors choosing the initial sales charge alternative and Class B and
Class C shares are sold to investors choosing the deferred sales charge
alternative. Each Class A, Class B, Class C and Class D share of a Portfolio
represents an identical interest in the investment portfolio of the Portfolio,
has the same rights and is identical in all respects to the other classes of
shares, except that Class B, Class C and Class D shares of the Portfolio 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
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 the distribution fee is paid. Each class has different
exchange privileges. See "Exchange Privilege."
 
INITIAL SALES CHARGE ALTERNATIVES--CLASS A AND CLASS D SHARES
   
  For the year ended June 30, 1996, Class A gross sales charges were $531,864,
of which the Distributor received $60,672, and Merrill Lynch received $471,192.
For the year ended June 30, 1995, Class A gross sales charges were $664,935, of
which the Distributor received $63,348, and Merrill Lynch received $601,587.
For the year ended June 30, 1994, Class A gross sales charges were $3,435,864,
of which the Distributor received $343,837, and Merrill Lynch received
$3,092,027. All of such sales charges were attributable to payments of initial
sales charges in connection with purchases of Class A shares of the Portfolios.
       
  For the year ended June 30, 1996, Class D gross sales charges were $271,962
of which the Distributor received $29,110 and Merrill Lynch received $242,852.
For the period October 21, 1994 (commencement of operations) to June 30, 1995,
Class D sales charges were $246,501 of which the Distributor received $17,470
and Merrill Lynch received $229,031. All of such sales charges were
attributable to payments of initial sales charges in connection with purchases
of Class D shares of the Portfolios.     
   
  Closed-End Fund Investment Option. Class A shares of the Fund and other MLAM-
advised mutual funds ("Eligible Class A Shares") are offered at net asset value
to shareholders of certain closed-end funds advised by MLAM or the Investment
Adviser who purchased such closed-end fund shares prior to October 21, 1994 and
wish to reinvest the net proceeds from a sale of their closed-end fund shares
of common stock     
 
                                       14
<PAGE>
 
   
in Eligible Class A shares, if the conditions set forth below are satisfied.
Alternatively, closed-end fund shareholders who purchased such 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
purchase 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 the 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 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 designed class of the Fund on such day.     
 
REDUCED INITIAL SALES CHARGES--CLASS A AND CLASS D SHARES
 
  As set forth in the Prospectus, a reduced sales charge is available for any
purchase in excess of $25,000 (in the case of the Insured Portfolio and
National Portfolio) and $100,000 for the Limited Maturity Portfolio of Class A
or Class D shares of a Portfolio. The term "purchase" as used in the Prospectus
and Statement of Additional Information in connection with 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 fiduciary purchasing shares for a single trust or
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 Investment Company Act of 1940, but does not include
purchases by any such company which has not been in existence for at least six
months or 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 will not include purchases by any group of individuals whose
sole organizational nexus is that the participants therein are credit card
holders of a company, policyholders of an insurance company, customers of
either a bank or broker-dealer or clients of an investment adviser.
 
                                       15
<PAGE>
 
  Right of Accumulation. Reduced sales charges are applicable through a right
of accumulation under which investors are permitted to purchase shares of any
of the three Portfolios 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 the shares of all of the Portfolios 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, and 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 benefits 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 of
Class A and Class D shares of the Portfolios, or any other MLAM-advised mutual
funds, where purchases of such shares aggregating $25,000 or more for the
Insured Portfolio and National Portfolio or $100,000 or more for the Limited
Maturity Portfolio are made through any dealer within a 13-month period
starting with the first purchase pursuant to a Letter of Intention in the form
provided by the Distributor. The Letter of Intention is not a binding
obligation to purchase any amount of Class A or Class D shares, but its
execution will result in the purchaser's paying a lower sales charge at the
appropriate quantity purchase level. The Letter of Intention is available only
to investors whose accounts are maintained at the Fund's Transfer Agent. A
purchase not originally made pursuant to a Letter of Intention may be included
under a subsequent letter 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 and Class D shares of the Portfolios and of other MLAM-
advised mutual funds (or eligible shares) 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
the Letter of Intention will be applied only to new purchases. If the total
amount of shares purchased does not equal the amount stated in the Letter of
Intention (minimum of $25,000 for the National and Insured Portfolio or
$100,000 for the Limited Maturity Portfolio), the investor will be notified and
must pay, within 20 days of the expiration of such Letter, the difference
between the sales charge on 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 and Class D shares equal to 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 and will be
involuntarily redeemed to pay the additional sales charge, if necessary. The
first purchase under the Letter of Intention must be at least five percent of
the dollar amount of such Letter. If during the term of such Letter a purchase
brings the total amount invested to an amount equal to or in excess of the
amount indicated in the Letter, the purchaser will be entitled on that purchase
and subsequent purchases to the reduced percentage sales charge which would be
applicable to a single purchase equal to the total dollar value of the shares
then being purchased plus the total cost of all shares previously purchased
under such Letter, 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 any Portfolio that
creates a sales charge will count toward completing a new or existing Letter of
Intention in any Portfolio.
 
                                       16
<PAGE>
 
  Employee Access Accounts SM. Class A or Class D shares are offered at net
asset value to Employee Access Accounts available through employers that
provide employer sponsored retirement or savings plans that are eligible to
purchase such shares at net asset value. The initial minimum investment for
such accounts is $500, except that the initial minimum investment 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.
          
  Employer-Sponsored Retirement or Savings Plans and Certain Other
Arrangements. Certain employer-sponsored retirement or savings plans and
certain other arrangements may purchase Class A or Class D shares at net asset
value, based on the number of employees or number of employees eligible to
participate in the plan, the aggregate amount invested by the plan in
specified investments and/or the services provided by Merrill Lynch to the
plan. Certain other plans may purchase Class B shares with a waiver of the
CDSC upon redemption, based on similar criteria. Such Class B shares will
convert into Class D shares approximately ten years after the plan purchases
the first share of any MLAM-advised mutual fund. Minimum purchase requirements
may be waived or varied for such plans. Additional information regarding
purchases by employer-sponsored retirement or savings plans and certain other
arrangements is available toll-free from Merrill Lynch Business Financial
Services at (800) 237-7777.     
 
  Merrill Lynch Blueprint SM Program. Class D shares of any of the three
Portfolios are offered to participants in the Merrill Lynch Blueprint SM
Program ("Blueprint"). In addition, participants in Blueprint who own Class A
shares of a Portfolio may purchase additional Class A shares of the Portfolio
through Blueprint. Blueprint is directed to small investors, group IRAs and
participants in certain affinity groups such as credit unions and trade
associations. Investors placing orders to purchase Class A or Class D shares
of a Portfolio through Blueprint will acquire the shares at net asset value
plus a sales charge calculated in accordance with Blueprint sales charge
schedule (i.e., up to $5,000 at 0.80% for Limited Maturity Portfolio, up to
$5,000 at 3.5% for the Insured Portfolio or National Portfolio, and $5,000.01
or more at the standard disclosed sales charge rate in the Prospectus).
However, services, including the exchange privilege, available to Class A or
Class D shareholders through Blueprint may differ from those available to
other investors. Class A and Class D shares are offered at net asset value, to
Blueprint participants through the Merrill Lynch Directed IRA Rollover Program
("IRA Rollover Program") available from Merrill Lynch Business Financial
Services, a business unit of Merrill Lynch. Orders for purchases and
redemptions of Class A or Class D shares of the Portfolios may be grouped for
execution purposes which, in some circumstances, may involve the execution of
such orders two business days following the day such orders are placed. The
minimum initial purchase price is $100, with a $50 minimum for subsequent
purchases through Blueprint. There are no minimum initial or subsequent
purchase requirements for participants who are part of an automatic investment
plan. Additional information concerning purchases through Blueprint, including
any annual fees and transaction charges, is available from Merrill Lynch,
Pierce, Fenner & Smith Incorporated, The Blueprint SM Program, P.O. Box 30441,
New Brunswick, New Jersey 08989-0441.
          
  Purchase Privileges of Certain Persons. Directors of the Fund, members of
the Boards of other MLAM-advised investment companies, ML & Co., Inc. and its
subsidiaries (the term "subsidiaries," when used herein with respect to
Merrill Lynch & Co., Inc., includes MLAM, FAM and certain other entities
directly or indirectly wholly owned and controlled by Merrill Lynch & Co.,
Inc.), and their directors and employees     
 
                                      17
<PAGE>
 
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 will be offered at net asset value, without 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. Second, the investor also 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
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 such fund
was subject to a sales charge either at the time of purchase or on a deferred
basis. Second, such purchase of Class D shares must be made within 90 days
after such notice.
 
  Class D shares of the Fund will be offered at net asset value, without 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 such shares of
other mutual fund and that such shares have been outstanding for a period of
no less than six months. 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.
 
  A purchase of $1 million or more in a single transaction by an investor, or
a purchase by a TMA SM Managed Trust, of Class A and Class D Shares of the
Fund's Portfolios will not be subject to an initial sales charge. Such
purchases will be subject to a contingent deferred sales charge if the shares
are redeemed within one year after purchase at the following rates: 1.00% on
purchases of $1,000,000 to $2,500,000; 0.60% on purchases of $2,500,000 to
$3,500,000; 0.40% on purchases of $3,500,000 to $5,000,000; and 0.25% on
purchases of more than $5,000,000 in lieu of paying an initial sales charge.
 
  Acquisition of Certain Investment Companies. The public offering price of
Class D shares of the Portfolios may be reduced to the net asset value per
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 in appropriate cases be adjusted to reduce possible adverse
tax consequences to the Fund which might result from an acquisition of assets
having net unrealized appreciation which is disproportionately higher at the
time of acquisition than the realized or unrealized appreciation of the Fund.
 
                                      18
<PAGE>
 
  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 which (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 illiquidity of market (except that the Fund may
acquire through such transactions restricted or illiquid securities to the
extent the Fund does not exceed the applicable limits on acquisition of such
securities set forth under "Investment Objective and Policies" herein).
 
  Purchases by Banks. Class A shares of the Fund's Insured Portfolio may be
purchased at net asset value, without a sales charge, by banks which have
invested a minimum of $25 million in such shares.
   
  Fee-Based Investment Programs. Certain Merrill Lynch fee-based investment
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. Termination of
participation in a Program may result in the redemption of such shares or the
automatic exchange thereof to another class at net asset value. 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 the Program's client agreement and from Merrill
Lynch Investor Services at (800) MER-FUND (637-3863).     
 
DISTRIBUTION PLANS
 
  Distribution Plans. Reference is made to "Purchase of Shares--Distribution
Plans" in the Prospectus for certain information with respect to the
distribution plans for Class B and Class C shares pursuant to Rule 12b-1 under
the Investment Company Act (each, a "Distribution Plan") with respect to the
account maintenance and/or distribution fees paid by the Fund to the
Distributor with respect to such classes.
 
  Payments of the account maintenance fees and/or distribution fees are subject
to the provisions of Rule 12b-1 under the Investment Company Act of 1940. Among
other things, each Distribution Plan provides that the Distributor shall
provide and the directors 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 directors must consider all
factors they deem relevant, including information as to the benefits of the
Distribution Plan to the Fund and the related class of shareholders of the
relevant Portfolio. Each Distribution Plan further provides that, so long as
the Distribution Plan remains in effect, the selection and nomination of
directors who are not "interested persons" of the Fund, as defined in the
Investment
 
                                       19
<PAGE>
 
Company Act of 1940 (the "Independent Directors"), shall be committed to the
discretion of the Independent Directors then in office. In approving each
Distribution Plan in accordance with Rule 12b-1, the Independent Directors
concluded that there is reasonable likelihood that such Distribution Plan will
benefit the Fund and the related class of shareholders of the Portfolio. Each
Distribution Plan can be terminated at any time, without penalty, by the vote
of a majority of the Independent Directors or by the vote of the holders of a
majority of the outstanding related voting securities of the relevant
Portfolio. A Distribution Plan cannot be amended to increase materially the
amount to be spent by any Portfolio without the approval of the related class
of shareholders of such Portfolio and all material amendments are required to
be approved by the vote of directors, including a majority of the Independent
Directors 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 Fund preserve copies of each class of
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 Rules of Fair Practice of the National
Association of Securities Dealers, Inc. ("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 of each
Portfolio. As applicable to the Fund, the maximum sales charge rule limits the
aggregate of distribution fee payments and CDSCs payable by the Fund with
respect to Class B or Class C shares of a Portfolio to (1) 6.25% of eligible
gross sales of such shares, computed separately for each class of a Portfolio
(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 of a Portfolio 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 of the relevant Portfolio, and any CDSCs with respect to that
class 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 tables set forth comparative information as of June 30, 1996
with respect to the Class B and Class C shares of the Fund indicating the
maximum allowable payments that can be made under the NASD maximum sales charge
rule and the Distributor's voluntary maximum for the period October 21, 1988
(commencement of operations) to June 30, 1996 for the Class B shares of the
National and Insured Portfolios, for the period November 2, 1992 (commencement
of operations) to June 30, 1996 for Class B shares of the Limited Maturity
Portfolio, and for the period October 21, 1994 (commencement of operations) to
June 30, 1996 for the Insured, National and Limited Maturity Portfolios.     
 
 
                                       20
<PAGE>
 
                       
                    DATA CALCULATED AS OF JUNE 30, 1996     
                                
                             INSURED PORTFOLIO     
 
<TABLE>   
<CAPTION>
                                                                                              ANNUAL
                                                                                           DISTRIBUTION
                                    ALLOWABLE ALLOWABLE              AMOUNTS                  FEE AT
                          ELIGIBLE  AGGREGATE  INTEREST  MAXIMUM    PREVIOUSLY   AGGREGATE   CURRENT
                           GROSS      SALES   ON UNPAID   AMOUNT     PAID TO      UNPAID    NET ASSET
CLASS B                   SALES(1)   CHARGES  BALANCE(2) PAYABLE  DISTRIBUTOR(3)  BALANCE    LEVEL(4)
- -------                  ---------- --------- ---------- -------- -------------- --------- ------------
                                                         (IN THOUSANDS)
<S>                      <C>        <C>       <C>        <C>      <C>            <C>       <C>
Under NASD Rule as
 Adopted................ $1,244,010  $77,750   $29,261   $107,011    $34,118      $72,893     $3,616
Under Distributor's
 Voluntary Waiver....... $1,244,010  $77,750   $ 6,220   $ 83,970    $34,118      $49,851     $3,616
<CAPTION>
CLASS C
- -------
<S>                      <C>        <C>       <C>        <C>      <C>            <C>       <C>
Under NASD Rule as
 Adopted................ $   17,958  $ 1,122   $    90   $  1,212    $    98      $ 1,114     $  104
Under Distributor's
 Voluntary Waiver.......        N/A      N/A       N/A        N/A        N/A          N/A        N/A
 
                               NATIONAL PORTFOLIO
 
<CAPTION>
                                                                                              ANNUAL
                                                                                           DISTRIBUTION
                                    ALLOWABLE ALLOWABLE              AMOUNTS                  FEE AT
                          ELIGIBLE  AGGREGATE  INTEREST  MAXIMUM    PREVIOUSLY   AGGREGATE   CURRENT
                           GROSS      SALES   ON UNPAID   AMOUNT     PAID TO      UNPAID    NET ASSET
CLASS B                   SALES(1)   CHARGES  BALANCE(2) PAYABLE  DISTRIBUTOR(3)  BALANCE    LEVEL(4)
- -------                  ---------- --------- ---------- -------- -------------- --------- ------------
                                                         (IN THOUSANDS)
<S>                      <C>        <C>       <C>        <C>      <C>            <C>       <C>
Under NASD Rule as
 Adopted................ $  642,675  $40,167   $13,676   $ 53,843    $16,318      $37,525     $1,996
Under Distributor's
 Voluntary Waiver....... $  642,675  $40,167   $ 3,213   $ 43,380    $16,318      $27,062     $1,996
<CAPTION>
CLASS C
- -------
<S>                      <C>        <C>       <C>        <C>      <C>            <C>       <C>
Under NASD Rule as
 Adopted................ $   15,944  $   996   $    74   $  1,070    $    68      $ 1,002     $   73
Under Distributor's
 Voluntary Waiver.......        N/A      N/A       N/A        N/A        N/A          N/A        N/A
</TABLE>    
 
                                       21
<PAGE>
 
                          LIMITED MATURITY PORTFOLIO
 
<TABLE>   
<CAPTION>
                                                                                              ANNUAL
                                                                                           DISTRIBUTION
                                    ALLOWABLE ALLOWABLE              AMOUNTS                  FEE AT
                          ELIGIBLE  AGGREGATE  INTEREST  MAXIMUM    PREVIOUSLY   AGGREGATE   CURRENT
                           GROSS      SALES   ON UNPAID   AMOUNT     PAID TO      UNPAID    NET ASSET
                          SALES(5)   CHARGES  BALANCE(2) PAYABLE  DISTRIBUTOR(6)  BALANCE    LEVEL(4)
                         ---------- --------- ---------- -------- -------------- --------- ------------
                                                         (IN THOUSANDS)
CLASS B
- -------
<S>                      <C>        <C>       <C>        <C>      <C>            <C>       <C>
Under NASD Rule as
 Adopted................ $  170,973 $ 10,685   $ 2,588   $ 13,273     $1,625     $ 11,648      $142
Under Distributor's
 Voluntary Waiver....... $  170,973 $ 10,685   $   854   $ 11,539     $1,625     $  9,914      $142
<CAPTION>
CLASS C
- -------
                                                       (NOT IN THOUSANDS)
<S>                      <C>        <C>       <C>        <C>      <C>            <C>       <C>
Under NASD Rule as
 Adopted................ $3,360,796 $210,050   $27,819   $237,869     $6,622     $231,247      $188
Under Distributor's
 Voluntary Waiver.......        N/A      N/A       N/A        N/A        N/A          N/A       N/A
</TABLE>    
- --------
(1) Purchase price of all eligible Class B shares sold since October 21, 1988
    (commencement of Class B operations) other than shares acquired through
    dividend reinvestment and the exchange privilege.
(2) Interest is computed on a monthly average Prime Rate basis based upon the
    prime rate, as reported in The Wall Street Journal, plus 1.0%, as
    permitted under the NASD Rule.
(3) Consists of CDSC payments, distribution fee payments and accruals. Of
    these distribution fee payments made prior to July 6, 1993 under the Prior
    Plan at the 0.75% rate, 0.50% of average daily net assets has been treated
    as a distribution fee and 0.25% of average daily net assets has been
    deemed to have been a service fee and not subject to the NASD maximum
    sales charge rule.
(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.
(5) Purchase price of all eligible Class B shares sold since November 2, 1992
    (commencement of Class B operations) other than shares acquired through
    dividend reinvestment and exchange privilege.
(6) Consists of CDSC payments, distribution fee payments and accruals. Of
    these distribution fee payments made prior to July 6, 1993 under the Prior
    Plan at the 0.35% rate, 0.25% of average daily net assets has been treated
    as a distribution fee and 0.10% of average daily net assets has been
    deemed to have been a service fee and not subject to the NASD maximum
    sales charge rule.
 
                             REDEMPTION OF SHARES
 
  The right to redeem shares or to receive payment with respect to any such
redemption may be suspended for any period during which trading on the New
York Stock Exchange is restricted as determined by the Securities and Exchange
Commission or such Exchange 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 any Portfolio is not reasonably
practicable, and for such other periods as the Securities and Exchange
Commission may by order permit for the protection of shareholders of each
Portfolio. Reference is made to "Redemption of Shares" in the Prospectus, for
certain information as to the redemption and repurchase of Fund shares.
 
                                      22
<PAGE>
 
  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
each Portfolio at such time.
 
REINSTATEMENT PRIVILEGE
   
  Holders of Class A or Class D shares of any Portfolio who have redeemed their
shares have a one-time privilege to reinstate their accounts by purchasing
Class A or Class D shares, as the case may be, of the Portfolio in which they
had invested at net asset value without a sales charge up to the dollar amount
redeemed. The reinstatement privilege may be exercised as follows. A notice to
exercise this privilege along with a check for the amount to be reinstated must
be received by the Transfer Agent within 30 days after the date the request for
redemption was executed 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. 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 Distributor.     
 
DEFERRED SALES CHARGE--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 of the
Insured Portfolio and National Portfolio redeemed within four years of purchase
and Class B shares of the Limited Maturity Portfolio redeemed within one year
of purchase are subject to a contingent deferred sales charge under most
circumstances, the charge is waived on redemptions of Class B shares following
the death or disability of a Class B shareholder. Redemptions for which the
waiver applies are any partial or complete redemptions following the death or
disability (as defined in the Internal Revenue Code) of a Class B shareholder
(including one who owns the Class B shares of any Portfolio 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 year ended June 30, 1996, the Distributor received CDSCs of $771,851
for the National Portfolio, $1,033,602 for the Insured Portfolio, and $106,430
for the Limited Maturity Portfolio, with respect to redemptions of Class B
shares, all of which were paid to Merrill Lynch.     
   
  For the year ended June 30, 1995, the Distributor received CDSCs of
$1,036,339 for the National Portfolio, $1,840,608 for the Insured Portfolio,
and $387,044 for the Limited Maturity Portfolio, with respect to redemptions of
Class B shares, all of which were paid to Merrill Lynch.     
   
  For the year ended June 30, 1994, the Distributor received CDSCs of $718,890
for the National Portfolio, $1,469,123 for the Insured Portfolio, and $190,903
for the Limited maturity Portfolio, with respect to redemptions of Class B
shares, all of which were paid to Merrill Lynch.     
          
  For the year ended June 30, 1996, the Distributor received CDSCs of $6,455
for the National Portfolio, $7,257 for the Insured Portfolio, and $2,130 for
the Limited Maturity Portfolio, with respect to redemptions of Class C shares,
all of which were paid to Merrill Lynch.     
   
  For the period October 21, 1994 (commencement of Class C operations) to June
30, 1995, the Distributor received CDSCs of $3,219 for the National Portfolio,
$5,361 for the Insured Portfolio, and $2,661 for the Limited Maturity
Portfolio, with respect to redemptions of Class C shares, all of which were
paid to Merrill Lynch.     
 
                                       23
<PAGE>
 
  All of such contingent deferred sales charges were attributable to payments
made in connection with redemptions of Class B and Class C shares of the
Portfolios.
       
  Merrill Lynch Blueprint SM Program. Class B shares of all three Portfolios
are offered to certain participants in the Merrill Lynch BlueprintSM Program
("Blueprint"). Blueprint is directed to small investors and participants in
certain affinity groups such as trade associations and credit unions. Class B
shares are offered through Blueprint only to members of certain affinity
groups. The CDSC is waived for shareholders who are members of such affinity
groups at the time of placing orders to purchase Class B shares through
Blueprint. However, services, including the exchange privilege, available to
Class B shareholders through Blueprint may differ from those available to
other Class B investors. Orders for purchases and redemptions of Class B
shares of any of the three Portfolios may be grouped for execution purposes
which, in some circumstances, may involve the execution of such orders two
business days following the day such orders are placed. The minimum initial
purchase price is $100, with a $50 minimum for subsequent purchases throughout
Blueprint. There is no minimum initial or subsequent purchase requirement for
investors who are part of the Blueprint automatic investment plan. Additional
information concerning Blueprint, including any annual fees or transaction
charges, is available from Merrill Lynch, Pierce, Fenner & Smith Incorporated.
The BlueprintSM Program, P.O. Box 30441, New Brunswick, New Jersey 08989-0441.
 
                      DIVIDENDS, DISTRIBUTIONS AND TAXES
 
  Reference is made to "Dividends, Distributions and Taxes--Federal Income
Taxes" in the Prospectus.
 
  Each Portfolio intends to qualify to pay "exempt-interest" dividends as
defined in Section 852(b)(5) of the Internal Revenue Code of 1986, as amended
(the "Code"). Under that section if, at the close of each quarter of its
taxable year, at least 50% of the value of its total assets consists of
obligations exempt from federal income tax ("tax-exempt obligations"),
pursuant to Section 103(a) of the Code (relating to obligations of a state,
territory, or a possession of the United States, or any political sub-division
of any of the foregoing, or of the District of Columbia), the Portfolio will
be qualified to pay exempt-interest dividends to its shareholders. Exempt-
interest dividends are dividends or any part thereof (other than any capital
gain distributions) paid by the Portfolio which are attributable to interest
on tax-exempt obligations and designated by the Portfolio as exempt-interest
dividends in a written notice mailed to the Portfolio's shareholders within
sixty days after the close of its taxable year. The percentage of the total
dividends paid by the Portfolio during any taxable year which qualifies as
exempt-interest dividends will be the same for all shareholders of each
Portfolio receiving dividends during such year. Exempt-interest dividends may
be treated by shareholders for all purposes as items of interest excludible
from their gross income under Section 103(a) of the Code. However, a
shareholder is advised to consult his tax adviser with respect to whether
exempt-interest dividends retain the exclusion under Section 103(a) if such
shareholder would be treated as a "substantial user" under Section 147(a)(1)
with respect to some or all of the tax-exempt obligations held by the
Portfolio.
 
  Dividends paid by each Portfolio from its taxable income (i.e., interest on
money market securities) and distributions of net realized short-term capital
gains (whether from tax-exempt or taxable obligations) are taxable to
shareholders as ordinary income. If a Portfolio acquires tax-exempt
obligations having market discount (generally, obligations acquired for a
price less than their principal amount) after April 30, 1993, gain on the
disposition or retirement of such obligations will be treated as ordinary
income to the extent of accrued market discount. To the extent the Portfolio
has both taxable and tax-exempt income, expenses of the Fund will be allocated
between the taxable and the tax-exempt income on a proportional basis. Since
the
 
                                      24
<PAGE>
 
   
Portfolio will not invest in the stock of domestic corporations, the dividends
received deductions for corporations will not be available. The per share
dividends on Class B and Class C shares of any Portfolio will be lower than the
per share dividends on Class A and Class D shares of those Portfolios as a
result of the account maintenance distribution and higher transfer agency fees
applicable to Class B and Class C shares; similarly, the per share dividends
and distributions on Class D shares will be lower than the per share dividends
and distributions on Class A shares as a result of the account maintenance fees
applicable with respect to the Class D shares. See "Net Asset Value." The Code
provides that interest on indebtedness incurred or continued to purchase or
carry shares of the Portfolio is not deductible to the extent attributable to
exempt-interest dividends.     
 
  As a result of trading in futures contracts, a Portfolio may realize net
capital gains which, when distributed to shareholders, would be taxable in the
hands of the shareholders. For example, if the Portfolios sold municipal bond
index futures contracts in anticipation of a decline in the value of securities
they own and that index in fact declines in value, the Portfolios would realize
a capital gain upon the closing out of that futures contract. Furthermore, if a
Portfolio holds such a futures contract on the last day of its taxable year, it
would be deemed under the Code to have sold that futures contract at its fair
market value on the last day of its taxable year and thus would realize a gain
or loss. Such gain or loss is treated as 60% long-term capital gain or loss and
40% short-term capital gain or loss (hereinafter "blended gain or loss"),
notwithstanding the holding period of the futures contract. Since the futures
transaction was entered into to hedge the anticipated decline in the portfolio
securities of the Portfolio in question, it is likely that the gain on the
futures transactions would be partly or completely offset by a corresponding
decline in the value of the portfolio securities of such Portfolio. However,
unless the Portfolios sell such securities so as to "realize" such losses in a
manner to offset the blended gain for Federal income tax purposes, the
Portfolio would have a blended gain. Such blended gain would result in taxable
income to the shareholders of the Fund.
 
  A redemption resulting in a gain is a taxable event whether or not the
reinstatement privilege is exercised. A redemption resulting in a loss will not
be a taxable event to the extent the reinstatement privilege is exercised and
an adjustment will be made to the shareholder's tax basis in shares acquired
pursuant to the reinstatement. For shares of a Portfolio acquired after October
3, 1989, if a shareholder disposes of those shares and subsequently reacquires
shares of the Portfolio pursuant to the reinstatement privilege, then the
shareholder's tax basis in those shares will be reduced to the extent the sales
charge paid to the Portfolio reduces any sales charge such shareholder would
have been required to pay on the subsequent acquisition in the absence of the
reinstatement privilege. Instead, such sales charge will be treated as an
additional amount paid for the subsequently acquired shares and will be
included in the shareholder's tax basis for such shares.
 
  No gain or loss will be recognized by Class B shareholders on the conversion
of their Class B shares for 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 of the converted Class B shares.
 
  If a shareholder exercises his exchange privilege within 90 days after the
date such shares were acquired to acquire shares in such fund or another fund
("New Fund"), then the loss, if any, recognized on the exchange will be reduced
(or the gain, if any, increased) to the extent the load charge paid to the Fund
reduces any load charge such shareholder would have been required to pay on the
acquisition of the New Fund shares in the absence of the exchange privilege.
Instead, such load charge will be treated as an amount paid for the New Fund
shares and will be included in the shareholder's basis for such shares.
 
                                       25
<PAGE>
 
  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.
 
  An exchange between funds pursuant to the Exchange Privilege is treated as a
sale for federal income tax purposes and, depending upon the circumstances, a
short- or long-term capital gain or loss may be realized. In addition, any
shareholder of the Fund who exercises the Exchange Privilege and becomes a
shareholder of another fund must certify to such other fund his Social Security
Number or Taxpayer Identification Number and that he is not subject to the
backup withholding tax if he wishes to avoid a 31% backup withholding tax on
the gross proceeds paid by such other fund on redemption of shares and on
dividend distributions made to him by such other fund.
 
  Any dividend declared by a Portfolio in October, November or December of any
year and made payable to shareholders of record in such a month will be deemed
to be received on December 31 of such year if actually paid during the
following January. Accordingly, those dividends, to the extent taxable, will be
taxable to shareholders in the year declared, and not in the year in which
shareholders actually receive the dividend.
 
  Not later than sixty days after the end of each fiscal year of the Fund, the
Fund will send to its shareholders the written notice required by the Code
designating the amount of its dividends that constitute exempt-interest
dividends, the amount of the dividends and distributions which are ordinary
taxable income and the amount of distributions which are taxable to
shareholders as long-term capital gains.
 
  Every person required to file a tax return must disclose on that return the
amount of exempt-interest dividends received from a Portfolio during the
taxable year. The disclosure of this amount is for information purposes only.
In addition, with respect to a shareholder who receives exempt-interest
dividends on shares held for less than six months, any loss on the sale or
exchange of such shares will, to the extent of the amount of such exempt-
interest dividends, be disallowed.
 
  Interest income with respect to certain tax-exempt bonds, known as "private
activity" bonds, is a preference item for purposes of the corporate and
individual alternative minimum tax. To the extent that a Portfolio invests in
private activity bonds, shareholders of the Portfolio will have preference
items attributable to their proportionate shares of the interest income
received by the Portfolio from such bonds, thereby increasing a Shareholders'
alternative minimum taxable income. In addition, a corporation must increase
its alternative minimum taxable income by 75 percent of the amount by which
adjusted current earnings exceed alternative minimum taxable income (without
regard to this provision or the alternative net operating loss deduction).
Adjusted current earnings are computed by making certain adjustments, which
generally follow the rules applicable to corporations in computing earnings and
profits. All tax-exempt dividends received by the corporate shareholders of a
Portfolio are included in their current earnings, thus, increasing a corporate
shareholders' alternative minimum taxable income.
 
  The Code imposes a four percent nondeductible excise tax on a regulated
investment company, such as a Portfolio of the Fund, if the company does not
distribute to its shareholders during the calendar year an amount equal to 98
percent of the investment company's taxable income, with certain adjustments,
for such calendar year, plus 98 percent of the company's capital gain net
income for the one-year period ending on October 31 of such calendar year. In
addition, an amount equal to any undistributed investment company
 
                                       26
<PAGE>
 
taxable income or capital gain net income from the previous calendar year must
also be distributed to avoid the excise tax. The excise tax is imposed on the
amount by which a company does not meet the foregoing distribution
requirements. The excise tax will not, however, generally apply to the tax-
exempt income of a regulated investment company, such as a Portfolio of the
Fund, that pays exempt-interest dividends. In addition, if a Portfolio has
taxable income that would be subject to the excise tax, the Fund intends to
distribute the income of such Portfolio so as to avoid payment of the excise
tax.
          
  At June 30, 1996, the Fund had a net capital loss carryforward as follows:
Approximately $40,724,000 in the Insured Portfolio, of which $38,085,000
expires in 2003 and $2,639,000 expires in 2004; approximately $66,385,000 in
the National Portfolio, of which $37,909,000 expires in 2003 and $28,476,000
expires in 2004; and approximately $5,891,000 in the Limited Maturity
Portfolio, of which $1,036,000 expires in 1997, $2,787,000 expires in 1998,
$22,000 expires in 1999, $25,000 expires in 2002 and $2,021,000 expires in
2003. These amounts will be available to offset like amounts of any future
taxable gains.     
 
  The foregoing is a general and abbreviated summary of the applicable
provisions of the Code and Treasury Regulations presently in effect. For the
complete provisions, reference should be made to the pertinent Code sections
and the Treasury Regulations promulgated thereunder. The Code and these
Regulations are subject to change by legislative or administrative action.
                              
                           SHAREHOLDER SERVICES     
   
  The Fund offers a number of shareholder services described below which are
designed to facilitate investment in its shares. Full details as to each of
such services and copies of the various plans described below can be obtained
from the Fund, the Distributor or Merrill Lynch. Certain of these services are
available only to United States investors.     
   
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 income dividends and
long-term capital gains distributions. The quarterly 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 reinvestment of
ordinary income dividends and long-term capital gains distributions. A
shareholder may make additions to his 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. 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. 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 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     
 
                                       27
<PAGE>
 
   
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. If the new brokerage firm is willing to accommodate the
shareholder in this manner, the shareholder must request that he be issued
certificates for his 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 the 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 dealer. Voluntary accumulation also can be made through a service
known as the Automatic Investment Plan whereby the Fund is authorized through
pre-authorized checks or automated 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. For
investors who buy shares of the Fund through Blueprint, no minimum charge to
the investors' bank account is required. Investors who maintain CMA(R) accounts
may arrange to have periodic investments made in the Fund, in the CMA(R)
accounts or in certain related accounts in amounts of $100 or more ($1 for
retirement accounts) through the CMA Automated Investment Program. The
Automatic Investment Plan is not available for Class C shares of the Limited
Maturity Portfolio.     
   
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
reinvested automatically in additional shares of the Fund. Such reinvestment
will be at the net asset value of shares of the Fund, without sales charge, as
of the close of business on the ex-dividend date of the dividend or
distribution. Shareholders may elect in writing or by telephone (1-800-MER-
FUND) to receive either their income dividends or capital gains distributions,
or both, in cash, in which event payment will be mailed or direct deposited on
or about the payment date.     
   
  Shareholders may, at any time, notify the Transfer Agent in writing that they
no longer wish to have their dividends and/or distributions reinvested in
shares of the Fund or vice versa and, commencing ten days after the receipt by
the Transfer Agent of such notice, those instructions will be effected.     
 
                          SYSTEMATIC WITHDRAWAL PLANS
 
  A holder of Class A or Class D shares of any of the three Portfolios may
elect to make systematic withdrawals of either a monthly or calendar quarterly
basis as provided below. Quarterly withdrawals of such shares are available for
shareholders who have acquired Class A or Class D shares having a value, based
upon cost or the current offering price, of $5,000 or more, and monthly
withdrawals are available for shareholders with Class A or Class D shares with
such a value of $10,000 or more.
 
  At the time of each withdrawal payment, sufficient Class A or Class D 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
either a dollar amount or a percentage of the value of his Class A or Class D
shares.
 
                                       28
<PAGE>
 
Redemptions will be made at net asset value as determined once daily by FAM
immediately after the declaration of dividends as of 15 minutes after the
close of business on the New York Stock Exchange (generally 4:00 P.M. New York
City time) on the 24th day of each month or the 24th day of the last month of
each quarter, whichever is applicable. If the Exchange is not open for
business on that day, Class A or Class D 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 Class A or
Class D shares in the Investment Account are automatically reinvested in Class
A or Class D shares, respectively. A shareholder's Systematic Withdrawal Plan
Account is automatically reinvested in shares of the same class. A
shareholder's Systematic Withdrawal Plan may be terminated at any time,
without charge or penalty, by the shareholder, the Fund, the Fund's Transfer
Agent or the Distributor.
 
  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
correspondingly reduced. Purchases of additional Class A or Class D shares
concurrent with withdrawals are ordinarily disadvantageous to the shareholder
because of sales charges and tax liabilities. The Fund will not knowingly
accept additions to an Investment Account in which an election has been made
to receive systematic withdrawals unless such addition 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.
   
  A Class A or Class D 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 Systematic Redemption
Program. The minimum fixed dollar amount redeemable is $25. The proceeds of
systematic redemptions will be posted to the shareholder's account three
business days after the date the shares are redeemed. Monthly systematic
redemptions will be made at net asset value on the first Monday of each month,
bimonthly systematic redemptions will be made at net asset value on the first
Monday of every other month, and quarterly, semiannual or annual redemptions
are made at net asset value on the first Monday of months selected at the
shareholder's option. If the first Monday of the month is a holiday, 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 Systematic Redemption Program, eligible shareholders
should contact their Financial Consultant.     
 
                              EXCHANGE PRIVILEGE
 
  Shareholders of each class of shares of a Portfolio of the Fund have an
exchange privilege with other Portfolios of the Fund and with certain other
MLAM-advised mutual funds listed below. Under the Merrill Lynch Select
Pricing SM System, Class A shareholders may exchange Class A shares of a
Portfolio for Class A shares of another Portfolio or a second MLAM-advised
mutual fund if the shareholder holds any Class A shares of the other Portfolio
or second fund in his 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 another Portfolio or a second MLAM-advised mutual fund,
 
                                      29
<PAGE>
 
and the shareholder does not hold Class A shares of the other Portfolio or
second fund in his account at the time of the exchange and is not otherwise
eligible to acquire Class A shares of the other Portfolio or second fund, the
shareholder will receive Class D shares of the other Portfolio or second fund
as a result of the exchange. Class D shares also may be exchanged for Class A
shares of another Portfolio or 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 other Portfolio or second fund in the account in which the exchange is
made or is otherwise eligible to purchase Class A shares of the other
Portfolio or second fund. Class B, Class C and Class D of a Portfolio shares
will be exchangeable with shares of the same class of another Portfolio or
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 Portfolio is "tacked" to
the holding period of the newly acquired shares of the other Portfolio or
other Fund as more fully described below. Class A, Class B, Class C and Class
D shares also will be exchangeable for shares of certain MLAM-advised money
market funds specifically designated below as available for exchange by
holders of Class A, Class B, Class C or Class D shares. Shares with a net
asset value of at least $100 are required to qualify for the exchange
privilege, except that there is no minimum value of shares which must be
exchanged by shareholders of the Insured Portfolio who exchange their shares
for shares of either the National Portfolio or the Limited Maturity Portfolio
and any shares utilized in an exchange must have been held by the shareholder
for at least 15 days. The exchange privilege available to participants in the
Merrill Lynch Blueprint SM Program may be different from that available to
other investors.
   
  Exchanges of Class A and Class D shares of a Portfolio outstanding
("outstanding Class A and Class D shares") for Class A or Class D shares of
another Portfolio or 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' will 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, dividend
reinvestment Class A or Class D shares will be exchanged into the Class A or
Class D shares of the other funds or into shares of the Class A or Class D
money market funds without a sales charge.     
 
  In addition, the Fund offers to exchange Class B and Class C shares of a
Portfolio outstanding ("outstanding Class B or Class C shares") for Class B or
Class C shares respectively of another Portfolio or any of the other MLAM-
advised mutual funds ("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 a Portfolio exercising the exchange privilege will
continue to be subject to that Portfolio's contingent deferred sales charge
schedule if such schedule is higher than the CDSC schedule relating to the new
Class B shares acquired through the use of the exchange privilege. In
addition, Class B shares of the Portfolio acquired through the use of the
exchange privilege will be subject to that Portfolio's CDSC schedule if such
schedule is higher than the CDSC schedule relating to the Class B shares of
the fund or Portfolio 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
 
                                      30
<PAGE>
 
holding period for the outstanding Class B shares is "tacked" to the holding
period of the new Class B or Class C shares. For example, an investor may
exchange Class B or Class C shares of the National Portfolio for those of the
Merrill Lynch Basic Value Fund, Inc. after having held the National Portfolio
Class B shares for two and a half years. The 2% contingent deferred sales
charge that generally would apply to a redemption would not apply to the
exchange. Two years later the investor may decide to redeem the Class B shares
of Merrill Lynch Basic Value Fund, Inc. and receive cash. There will be no
contingent deferred sales charge due on this redemption, since by "tacking" the
two and a half year holding period of National Portfolio Class B shares to the
two year holding period for the Merrill Lynch Basic Value Fund, Inc. Class B
shares, the investor will be deemed to have held the new Class B shares for
more than four years.
   
  The exchange privilege is modified with respect to certain retirement plans
which participate in the Merrill Lynch Mutual Fund Adviser ("MFA") program.
Such retirement plans may exchange Class B, Class C or Class D shares that have
been held for at least one year for Class A shares of the same fund on the
basis of relative net asset values in connection with the commencement of
participation in the MFA program, i.e., no CDSC will apply. The one year
holding period does not apply to shares acquired through reinvestment of
dividends. Upon termination of participation in the MFA program, Class A shares
will be re-exchanged for the class of shares originally held. For purposes of
computing any CDSC that may be payable upon redemption of Class B or Class C
shares so reacquired, or the conversion period for Class B shares so
reacquired, the holding period for the Class A shares will be "tacked" to the
holding period for the Class B or Class C shares originally held.     
   
  Shareholders also may exchange shares of the Fund into shares of a money
market fund advised by the Investment Adviser or its affiliates, but the period
of time that Class B or Class C shares are held in a Class B or Class C 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
Class B money market fund which were acquired as a result of an exchange for
Class B or Class C shares of a fund may, in turn, be exchanged back into Class
B or Class C shares of any fund offering such shares, in which event the
holding period for Class B or Class C shares of that 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 National Portfolio for
shares of Merrill Lynch Institutional Fund ("Institutional Fund") after having
held the Class B shares for two and a half years, and two years later decide to
redeem the shares of 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
National Portfolio been redeemed for cash rather than exchanged for shares of
Institutional Fund will be payable. If, instead of such redemption the
shareholder exchanged such shares for Class B shares of a fund which the
shareholder continued to hold for an additional one and a half years, any
subsequent redemption will 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. Exercise of the exchange privilege is treated as a sale for Federal
income tax purposes and, depending on the circumstances, a short- or long-term
capital gain or loss may be realized. In addition, a shareholder exchanging
shares of any of the funds may be subject to a backup withholding tax unless
such shareholder certifies under penalty of perjury that the taxpayer
identification number on file with any such fund is correct and that such
shareholder is not otherwise subject to backup withholding. See "Dividends,
Distributions and Taxes" below.
 
                                       31
<PAGE>
 
  To exercise the Exchange Privilege, shareholders should contact their listed
dealer, who will advise the Fund of the exchange, or the shareholder may write
to the Transfer Agent requesting that the exchange be effected. Such letter
must be signed exactly as the account is registered with signature(s)
guaranteed by "eligible guarantor institution" (including, for example, Merrill
Lynch branch offices and certain other financial institutions) as such 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. Shareholders of the Fund, and
shareholders of the other 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 a
properly completed Exchange Application. These funds may suspend the continuous
offering of their shares to the public at any time and may thereafter resume
such offering from time to time.
 
  The Exchange Privilege may be modified or terminated at any time on 60 days'
notice. The Fund reserves the right to limit the number of times an investor
may exercise the Exchange Privilege. The exchange privilege is available only
to U.S. shareholders in states where the exchange legally may be made.
 
                                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.
Total return 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 Securities and Exchange 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
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
(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 calculation 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.
 
                                       32
<PAGE>
 
  Set forth below is total return information for each class of shares of each
Portfolio for the periods indicated.
       
    AVERAGE ANNUAL TOTAL RETURN (INCLUDING MAXIMUM APPLICABLE SALES CHARGES)
 
<TABLE>   
<CAPTION>
                          EXPRESSED AS A PERCENTAGE BASED ON              REDEEMABLE VALUE OF A HYPOTHETICAL $1,000
                           A HYPOTHETICAL $1,000 INVESTMENT                  INVESTMENT AT THE END OF THE PERIOD
                          -------------------------------------------     -----------------------------------------
                                                            LIMITED                                      LIMITED
                           NATIONAL         INSURED        MATURITY         NATIONAL       INSURED      MATURITY
                           PORTFOLIO       PORTFOLIO       PORTFOLIO        PORTFOLIO     PORTFOLIO     PORTFOLIO
                          -----------     -----------     -----------     ------------- ------------- -------------
<S>                       <C>             <C>             <C>             <C>           <C>           <C>
One Year Ended June 30,
 1996
 Class A................           2.71%           1.29%           2.71%      $1,027.10     $1,012.90 $    1,027.10
 Class B................           2.17            0.72            2.38        1,021.70      1,007.20      1,023.80
 Class C................           5.01            3.66            1.97        1,050.10      1,036.60      1,019.70
 Class D................           2.45            1.04            2.51        1,024.50      1,010.40      1,025.10
Five Years Ended June
 30, 1996
 Class A................           6.95%           6.52%           4.34%  $    1,399.30 $    1,371.40 $    1,236.40
 Class B................           7.04            6.59             --         1,405.20      1,375.80           --
Ten Years Ended June 30,
 1996
Class A.................           7.49%           7.34%           5.00%  $    2,058.70 $    2,030.40 $    1,629.40
Class B 10/21/88-
 6/30/96................           6.97            6.87             --         1,678.90      1,667.50           --
Class B 11/02/92-
 6/30/96................            --              --             3.49             --            --       1,133.70
Inception (October 21,
 1994) to June 30, 1996
 Class C................           8.31%           7.99%           3.84%  $    1,144.60 $    1,139.00 $    1,065.90
 Class D................           6.37            6.00            3.69        1,110.20      1,103.80      1,063.30
</TABLE>    
 
                                       33
<PAGE>
 
                              ANNUAL TOTAL RETURN
                  (EXCLUDING MAXIMUM APPLICABLE SALES CHARGE)
 
<TABLE>   
<CAPTION>
                                              LIMITED                       LIMITED
                         NATIONAL   INSURED  MATURITY  NATIONAL   INSURED  MATURITY
  YEAR ENDED JUNE 30,    PORTFOLIO PORTFOLIO PORTFOLIO PORTFOLIO PORTFOLIO PORTFOLIO
  -------------------    --------- --------- --------- --------- --------- ---------
<S>                      <C>       <C>       <C>       <C>       <C>       <C>
1996
  (Class A).............    6.98%     5.51%    3.75%   $1,069.80 $1,055.10 $1,037.50
  (Class B).............    6.17      4.71     3.37     1,061.70  1,047.10  1,033.70
  (Class C).............    6.01      4.65     2.97     1,060.10  1,046.50  1,029.70
  (Class D).............    6.71      5.25     3.55     1,067.10  1,052.50  1,035.50
1995
  (Class A).............    7.89      8.60     4.53     1,078.90  1,086.00  1,045.30
  (Class B).............    7.28      7.91     4.14     1,072.80  1,079.10  1,041.40
  (Class C)**...........    7.97      8.83     3.52     1,079.70  1,088.30  1,035.20
  (Class D)**...........    8.37      9.24     3.73     1,083.70  1,092.40  1,037.30
1994
  (Class A).............   (0.47)    (1.08)    2.30       995.30    989.20  1,023.00
  (Class B).............   (1.39)    (1.81)    1.98       986.10    981.90  1,019.80
1993
  (Class A).............   12.19     12.41     5.28     1,121.90  1,124.10  1,052.80
  (Class B)*............   11.45     11.44     3.26     1,114.50  1,114.40  1,032.60
1992
  (Class A).............   13.09     12.11     6.93     1,130.90  1,121.10  1,069.30
  (Class B).............   12.25     11.27      --      1,122.50  1,112.70       --
1991
  (Class A).............    7.94      8.84     6.45     1,079.40  1,088.40  1,064.50
  (Class B).............    7.14      8.02      --      1,071.40  1,080.20       --
1990
  (Class A).............    5.53      5.76     6.16     1,055.30  1,057.60  1,061.60
  (Class B).............    4.74      4.98      --      1,047.40  1,049.80       --
1989
  (Class A).............   11.89     11.62     5.96     1,118.90  1,116.20  1,059.60
  (Class B) (10/21/88-
   6/30/89).............    6.48      6.88      --      1,064.80  1,068.80       --
1988....................    6.89      7.75     4.83     1,068.90  1,077.50  1,048.30
1987....................    7.99      6.94     4.99     1,079.90  1,069.40  1,049.90
1986....................   17.09     15.62     6.50     1,170.90  1,156.20  1,065.00
1985....................   22.36     22.21     8.72     1,223.60  1,222.10  1,087.20
1984....................    4.44      3.00     5.58     1,044.40  1,030.00  1,055.80
1983....................   32.66     31.60     8.59     1,326.60  1,316.00  1,085.90
1982....................    2.73      (.33)    7.96     1,027.30    996.70  1,079.60
1981....................   (2.72)   (10.27)    4.55       972.80    897.30  1,045.50
1980....................    4.21     (5.88)    5.91     1,042.10    941.20  1,059.10
</TABLE>    
- --------
 * November 2, 1992 to June 30, 1993 for Limited Maturity Portfolio.
** October 21, 1994 (commencement of operations) to June 30, 1995 for Class C
 and Class D Shares.
 
                                       34
<PAGE>
 
                            AGGREGATE TOTAL RETURN
                 (INCLUDING MAXIMUM APPLICABLE SALES CHARGES)
 
<TABLE>   
<CAPTION>
                                              LIMITED                       LIMITED
                         NATIONAL   INSURED  MATURITY  NATIONAL   INSURED  MATURITY
  YEAR ENDED JUNE 30,    PORTFOLIO PORTFOLIO PORTFOLIO PORTFOLIO PORTFOLIO PORTFOLIO
  -------------------    --------- --------- --------- --------- --------- ---------
<S>                      <C>       <C>       <C>       <C>       <C>       <C>
From Inception to June
 30, 1996**
  Class A...............  325.55%   234.77%   158.55%  $4,255.50 $3,347.70 $2,585.50
  Class B...............   67.89     66.75     13.37    1,678.90  1,667.50  1,133.70
  Class C...............   14.46     13.90      6.59    1,144.60  1,139.00  1,065.90
  Class D...............   11.02     10.38      6.33    1,110.20  1,103.80  1,063.30
</TABLE>    
- --------
** Commencement of operations is November 2, 1979 for Class A shares of
   National Portfolio and shares of Limited Maturity Portfolio, October 21,
   1977 for Class A shares of Insured Portfolio, and October 21, 1988 for
   Class B shares of National Portfolio and Insured Portfolio, and November 2,
   1992 for Class B shares of Limited Maturity Portfolio. Commencement of
   operations is October 21, 1994 for Class C and Class D shares of each
   Portfolio.
 
  In order to reflect the reduced sales charges applicable to certain
investors the performance data in advertisements distributed to investors
whose purchases are subject to reduced sales load, in the case of Class A or
Class D shares, or waiver of the contingent deferred sales charge in the case
of the Class B and Class C shares, may take into account the reduced, and not
the maximum, sales charge or may not take into account the contingent deferred
sales charge and therefore may reflect greater total return since, due to the
reduced sales charge, a lower amount of expenses is deducted.
 
  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
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 adding the result to that part, if any, of
the Fund's yield that is not tax-exempt.
   
  The following table sets forth the yield for the 30-day period ending June
30, 1996 for each class of each Portfolio.     
 
<TABLE>   
<CAPTION>
                              FOR THE PERIOD ENDING JUNE 30, 1996
                ---------------------------------------------------------------
                                             YIELD
                ---------------------------------------------------------------
                INSURED PORTFOLIO NATIONAL PORTFOLIO LIMITED MATURITY PORTFOLIO
                ----------------- ------------------ --------------------------
<S>             <C>               <C>                <C>
Class A........       4.94%              5.44%                  3.86%
Class B........       4.39               4.91                   3.54
Class C........       4.34               4.87                   3.53
Class D........       4.70               5.20                   3.80
</TABLE>    
 
                                      35
<PAGE>
 
  The tax equivalent yield for the same period (based on a tax rate of 28%)
was:
 
<TABLE>   
<CAPTION>
                INSURED PORTFOLIO NATIONAL PORTFOLIO LIMITED MATURITY PORTFOLIO
                ----------------- ------------------ --------------------------
<S>             <C>               <C>                <C>
Class A........       6.86%              7.56%                  5.36%
Class B........       6.10               6.82                   4.92
Class C........       6.03               6.76                   4.90
Class D........       6.53               7.22                   5.28
</TABLE>    
 
  Total return, yield and tax equivalent yield figures are based on each
Portfolio's historical performance and are not intended to indicate future
performance. Each Portfolio's total return, yield and tax equivalent yield will
vary depending on market conditions, the securities comprising the Portfolio,
the Portfolio's operating expenses and the amount of realized and unrealized
net capital gains or losses during the period. The value of an investment in a
Portfolio will fluctuate and an investor's shares, when redeemed, may be worth
more or less than their original cost.
 
                             ADDITIONAL INFORMATION
 
DESCRIPTION OF TEMPORARY INVESTMENTS
 
  The short-term money market securities in which the Portfolios may invest as
temporary investments consist of United States Government securities, United
States Government agency securities, domestic bank certificates of deposit and
bankers' acceptances, short-term corporate debt securities such as commercial
paper, and repurchase agreements. The money market securities must have a
stated maturity not in excess of one year from the date of purchase. U.S.
Government securities consist of various types of marketable securities issued
by or guaranteed as to principal and interest by the U.S. Government and
supported by the full faith and credit of the U.S. Treasury. U.S. Government
agency securities consist of debt securities issued by government sponsored
enterprises, federal agencies and international institutions. Such securities
are not direct obligations of the Treasury but involve government sponsorship
or guarantees by government agencies or enterprises. The Fund has established
the following standards with respect to money market securities in which the
Portfolios invest. Commercial paper investments at the time of purchase must be
rated "A" by Standard & Poor's Ratings Group or "Prime" by Moody's Investors
Service, Inc. or, if not rated, issued by companies having an outstanding debt
issue rated at least "A" by Standard & Poor's 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 or by Moody's. The Portfolios may not invest in any
securities issued by a commercial bank or a savings and loan association unless
the bank or association 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.
 
INSURANCE ON PORTFOLIO SECURITIES
   
  Set forth below is further information with respect to the Mutual Fund
Insurance Policies (the "Policies") which the Fund has obtained from AMBAC
Indemnity Corporation ("AMBAC"), Municipal Bond Investors Assurance Corporation
("MBIA") and Financial Security Assurance Inc. ("FSA"), with respect to Insured
Municipal Bonds held by the Insured Portfolio (see "Investment Policies of the
Portfolios--Insured Portfolio" in the Prospectus). During the fiscal year ended
June 30, 1996, the premium for the policies aggregated $24,156 or approximately
0.00001% of the average net assets of the Insured Portfolio.     
 
                                       36
<PAGE>
 
  In determining eligibility for insurance, AMBAC, MBIA and FSA have applied
their own standards, which correspond generally to the standards they normally
use in establishing the insurability of new issues of Municipal Bonds and which
are not necessarily the criteria which would be used in regard to the purchase
of Municipal Bonds by the Insured Portfolio. The Policies do not insure (i)
municipal securities ineligible for insurance, or (ii) municipal securities
which are no longer owned by the Insured Portfolio. In addition, the AMBAC
policy does not insure municipal obligations which were insured as to the
payment of principal and interest at the time of their issuance by AMBAC.
 
  The Policies do not guarantee the market value of the Insured Municipal Bonds
or the value of the shares of the Insured Portfolio. In addition, if the
provider of an original issuance insurance policy is unable to meet its
obligations under such policy or if the rating assigned to the claims paying
ability of any such insurer deteriorates, neither AMBAC nor MBIA nor FSA has
any obligation to insure any issue held by the Insured Portfolio which is
adversely affected by either of the above described events. The AMBAC policy
provides for an annual policy period, which is renewable by the Fund for
successive annual periods for so long as the Fund is in compliance with the
terms of the AMBAC policy. In addition to the payment of premiums, the Policies
require that the Insured Portfolio notify AMBAC and MBIA as to all Municipal
Bonds in the Insured Portfolio and permit AMBAC and MBIA to audit records. The
insurance premiums are payable monthly by the Insured Portfolio in accordance
with a premium schedule which was furnished by AMBAC, MBIA and FSA at the time
the Policies were issued. Premiums are based upon the amounts covered and the
composition of the portfolio. AMBAC has reserved the right to change the
premium schedule for any renewal policy period as to any municipal securities
purchased by the Insured Portfolio during such renewal period. The FSA policy
and the MBIA policy both provide that the premium rate for subsequent purchases
by the Insured Portfolio of the same obligations will be determined by FSA or
MBIA as of the date of such purchases.
 
  AMBAC has received a letter ruling from the Internal Revenue Service, which
holds in effect that insurance proceeds representing maturing interest on
defaulted municipal obligations paid by AMBAC to municipal bond funds
substantially similar to the Insured Portfolio, under policy provisions
substantially identical to the policy described herein, will be excludable from
federal gross income under Section 103(a) of the Internal Revenue Code.
   
  AMBAC insures the portfolio of the Insured Portfolio and the prompt payment
of the interest and principal of new issues of Municipal Bonds and Municipal
Bond portfolios of individuals, banks, trust companies, corporations, insurance
companies and units trusts. As of June 30, 1996, the admitted assets of AMBAC
were approximately $2,505.3 million (unaudited) with a qualified capital of
approximately $1,384.3 million (unaudited). Qualified capital consists of the
statutory contingency reserve and policyholders' surplus of the insurance
company.     
   
  FSA insures the prompt payment of interest and principal of new issues of
Municipal Bonds and Municipal Bond portfolios of individuals, banks, trust
companies, corporations, insurance companies and unit trusts. As of June 30,
1996, the total admitted assets (unaudited) of FSA were approximately $1,177.0
million with a total capital and surplus (unaudited) of approximately $661.7
million as reported to the Insurance Department of the State of New York.     
 
  MBIA insures the prompt payment of interest and principal of new issues of
Municipal Bonds and Municipal Bond portfolios of individuals, banks, trust
companies, corporations, insurance companies and unit
 
                                       37
<PAGE>
 
   
trusts. As of June 30, 1996, the total admitted assets of MBIA were
approximately $4,160.2 million (unaudited) with total capital and surplus of
approximately $2,180.1 million (unaudited).     
 
  AMBAC has entered into reinsurance agreements with a number of unaffiliated
reinsurers, relating to the municipal bond insurance programs of AMBAC
including the insurance obtained by the Fund for the portfolio of the Insured
Portfolio.
 
  The contracts of insurance relating to the Insured Portfolio and the
negotiations in respect thereof represent the only significant relationship
between AMBAC, MBIA and FSA and the Fund. Otherwise neither AMBAC or any
associate thereof, nor MBIA or any associate thereof, nor FSA or any associate
thereof has any material business relationship, direct or indirect, with the
Fund.
 
  AMBAC, MBIA and FSA are subject to regulation by the department of insurance
in each state in which they are qualified to do business. Such regulation,
however, is not a guarantee that any of AMBAC, MBIA or FSA will be able to
perform on its contractual insurance in the event a claim should be made
thereunder at some time in the future.
 
  The information relating to AMBAC, MBIA and FSA set forth above, including
the financial information, has been furnished by such corporations. Financial
information with respect to AMBAC, MBIA and FSA appears in reports filed by
AMBAC, MBIA and FSA with state insurance regulatory authorities and is subject
to audit and review by such authorities. No representation is made herein as to
the accuracy or adequacy of such information with respect to AMBAC, MBIA or FSA
or as to the absence of material adverse changes in such information subsequent
to the date thereof.
 
DESCRIPTION OF FINANCIAL FUTURES CONTRACTS
 
  Futures Contracts. 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 called for in the contract or, in some instances,
to make a cash settlement based upon the value of an instrument or an index of
values, at a specified future time for a specified price. Although the terms of
a contract call for actual delivery of the underlying financial instrument, or
for a cash settlement, in most cases the contracts are closed out before the
delivery date without the delivery taking place. The Fund intends to close out
its futures contracts prior to the delivery date of such contracts.
   
  The Insured Portfolio, the National Portfolio and the Limited Maturity
Portfolio (collectively, the "Portfolios") may sell futures contracts in
anticipation of a decline in value of their investments in Municipal Bonds. The
loss associated with any such decline could be reduced without employing
futures as a hedge by selling long-term securities 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
brokerage commissions and dealer spreads and will typically reduce the
Portfolio's average yields as a result of the shortening of maturities.     
       
  The purchase or sale of a futures contract differs from the purchase or sale
of a security in that the total cash value reflected by the futures contract is
not paid. Instead, an amount of cash or securities acceptable to the Fund's
futures commission merchant ("FCM") and the relevant contract market, which
varies but is generally about 5% or less of the contract amount, must be
deposited with the FCM. This amount is known
 
                                       38
<PAGE>
 
as "initial margin," and represents a "good faith" deposit assuring the
performance of both the purchaser and the seller under the futures contract.
Subsequent payments to and from the FCM, known as "maintenance" or "variation
margin," are required to be made on a daily basis as the price of the futures
contract fluctuates, making the long or short position in the futures contract
more or less valuable, a process known as "marking to the market." 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 FCM, and the
purchaser realizes a loss or gain. In addition, a commission is paid on each
completed purchase and sale transaction.
 
  The sale of financial futures contracts provides an alternative means of
hedging a Portfolio against declines in the value of its investments in
Municipal Bonds. As such values decline, the value of the Portfolio's positions
in the futures contracts are expected to increase, thus offsetting all or a
portion of the depreciation in the market value of the Portfolios' fixed income
investments which are being hedged. While the Portfolios will incur commission
expenses in establishing and closing out futures positions, commissions on
futures transactions may be significantly lower than transaction costs incurred
in the purchase and sale of fixed income securities. In addition, the ability
of the Portfolios to trade in the standardized contracts available in the
futures market may offer a more effective hedging strategy than a program to
reduce the average maturity of portfolio securities, due to the unique and
varied credit and technical characteristics of the municipal debt instruments
available to the Portfolios. Employing futures as a hedge may also permit the
Portfolios to assume a hedging posture without reducing the yield on their
investments beyond any amounts required to engage in futures trading.
 
  The Portfolios engage in the purchase and sale of future contracts on an
index of municipal securities. These instruments provide for the purchase or
sale of a hypothetical portfolio of municipal bonds at a fixed price in a
stated delivery month. Unlike most other futures contracts, however, a
municipal bond index futures contract does not require actual delivery of
securities but results in a cash settlement based upon the difference in value
of the index between the time the contract was entered into and the time it is
liquidated.
 
  The municipal bond index underlying the futures contracts traded by the
Portfolios is The Bond Buyer Municipal Bond Index, developed by The Bond Buyer
and the Chicago Board of Trade ("CBT"), the contract market on which the
futures contracts are traded. As currently structured, the index is comprised
of 40 tax-exempt term municipal revenue and general obligation bonds. Each bond
included in the index must be rated either A- or higher by Standard & Poor's or
A or higher by Moody's Investors Service 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 will be deleted
from, the index. The value of the index is computed daily according to a
formula based upon the price of each bond in the Index, as evaluated by four
dealer-to-dealers brokers.
 
  The Portfolios may also purchase and sell futures contracts on U.S. Treasury
bills, notes and bonds for the same types of hedging purposes. Such futures
contracts provide for delivery of the underlying security at a specified future
time for a fixed price, and the value of the futures contract generally
fluctuates with movements in interest rates.
 
  The municipal bond index futures contract, futures contracts on U.S. Treasury
securities and options on such futures contracts are traded on the CBT and the
Chicago Mercantile Exchange, which, like other
 
                                       39
<PAGE>
 
contract markets, assures the performance of the parties to each futures
contract through a clearing corporation, a nonprofit organization managed by
the exchange membership, which is also responsible for handling daily
accounting of deposits or withdrawals of margin.
 
  The Portfolios may also purchase financial futures contracts when they are
not fully invested in municipal bonds in anticipation of an increase in the
cost of securities they intend to purchase. As such securities are purchased,
an equivalent amount of futures contracts will be closed out. In a substantial
majority of these transactions, the Portfolios will purchase municipal bonds
upon termination of the futures contracts. Due to changing market conditions
and interest rate forecasts, however, a futures position may be terminated
without a corresponding purchase of securities. Nevertheless, all purchases of
futures contracts by the Portfolios will be subject to certain restrictions,
described below.
   
  Options on Futures Contracts.  An option on a futures contract provides the
purchaser with the right, but not the obligation, to enter into a long position
in the underlying futures contract (i.e., purchase the futures contract), in
the case of a "call" option, or to enter into a short position (i.e., sell the
futures contract), in the case of a "put" option, for a fixed price (the
"exercise" or "strike" price) up to a stated expiration date. The option is
purchased for a nonrefundable fee, known as the "premium." Upon exercise of the
option, the contract market clearing house assigns each party the appropriate
position in the underlying futures contract. In the event of exercise,
therefore, the parties are subject to all of the risks of futures trading, such
as payment of initial and variation margin. In addition, the seller, or
"writer," of the option is subject to margin requirements on the option
position. Options on futures contracts are traded on the same contract markets
as the underlying futures contracts.     
 
  The Portfolios may purchase options on futures contracts for the same types
of hedging purposes described above in connection with futures contracts. For
example, in order to protect against an anticipated decline in the value of
securities it holds, a Portfolio could purchase put options on futures
contracts, instead of selling the underlying futures contracts. Conversely, in
order to protect against the adverse effects of anticipated increases in the
cost of securities to be acquired, a Portfolio could purchase call options on
futures contracts, instead of purchasing the underlying futures contracts. The
Portfolios generally will sell options on futures contracts only to close out
an existing position.
 
  The Portfolios will not engage in transactions in such instruments unless and
until the Investment Adviser determines that market conditions and the
circumstances of the Portfolios warrant such trading. To the extent the
Portfolios engage in the purchase and sale of futures contracts or options
thereon, they will do so only at a level which is reflective of the Investment
Adviser's view of the hedging needs of the Portfolios, the liquidity of the
market for futures contracts and the anticipated correlation between movements
in the value of the futures or option contract and the value of securities held
by the Portfolios.
   
  Restrictions on the Use of Futures Contracts and Options on Futures
Contracts.  Under regulations of the Commodity Futures Trading Commission
("CFTC"), the futures trading activities described herein will not result in
the Portfolios' being deemed to be "commodity pools," as defined under such
regulations, provided that certain trading restrictions are adhered to. In
particular, CFTC regulations require that a notice of eligibility be filed and
that all futures and option positions entered into by the Portfolios qualify as
bona fide hedge transactions, as defined under CFTC regulations, or that any
nonqualifying positions be limited so that the sum of the amount of initial
margin deposits and premiums paid on such positions would not exceed 5% of the
market value of the respective Portfolio's net assets.     
 
                                       40
<PAGE>
 
   
  When either Portfolio purchases a futures contract, it will maintain an
amount of cash, cash equivalents or commercial paper or liquid securities in a
segregated account with the Fund's custodian, so that the amount so segregated
plus the amount of initial 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 Transactions in Futures Contracts and Options Thereon. The
particular municipal bonds comprising the index underlying the municipal bond
index futures contract may vary from the bonds held by the Portfolios. In
addition, the securities underlying futures contracts on U.S. Treasury
securities will not be the same as securities held by the Portfolios. As a
result, the Portfolios' ability effectively to hedge all or a portion of the
value of their municipal bonds through the use of futures contracts will depend
in part on the degree to which price movements in the index underlying the
municipal bond index futures contract, or the U.S. Treasury securities
underlying other futures contracts traded, correlate with price movements of
the Municipal Bonds held by the Portfolios.
 
  For example, where prices of securities in the Portfolios do not move in the
same direction or to the same extent as the values of the securities or index
underlying a futures contract, the trading of such futures contracts may not
effectively hedge the Portfolios' investments and may result in trading losses.
The correlation may be affected by disparities in the average maturity,
ratings, geographical mix or structure of the Portfolios' investments as
compared to those comprising the index, and general economic or political
factors. In addition, the correlation between movements in the value of the
index underlying a futures contract may be subject to change over time, as
additions to and deletions from the index alter its structure. In the case of
futures contracts on U.S. Treasury securities and options thereon, the
anticipated correlation of price movements between the U.S. Treasury securities
underlying the futures or options and Municipal Bonds may be adversely affected
by economic, political, legislative or other developments that have a disparate
impact on the respective markets for such securities. In the event that the
Investment Adviser determines to enter into transactions in financial futures
contracts other than the municipal bond index futures contract or futures on
U.S. Treasury securities, the risk of imperfect correlation between movements
in the prices of such futures contracts and the prices of Municipal Bonds held
by the Portfolios may be greater.
 
  The trading of futures contracts on an index also entails the risk of
imperfect correlation between movements in the price of the futures contract
and the value of the underlying index. The anticipated spread between the
prices may be affected due to differences in the nature of the markets, such as
margin requirements, liquidity and the participation of speculators in the
futures markets. The risk of imperfect correlation, however, generally
diminishes as the delivery month specified in the futures contract approaches.
 
  Prior to exercise or expiration, and absent delivery, a position in futures
contracts or options thereon may be terminated only by entering into a closing
purchase or sale transaction on the relevant contract market. A Portfolio will
enter into a futures or option position only if there appears to be a liquid
market therefor, although there can be no assurance that such a liquid market
will exist for any particular contract at any specific time. Thus, it may not
be economically practicable, or otherwise possible, to close out a position
once it has been established. Under such circumstances, a portfolio could be
required to make continuing daily cash payments of variation margin in the
event of adverse price movements. In such situations, if the Portfolio 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. In addition, the Portfolio may be required
 
                                       41
<PAGE>
 
to perform under the terms of the futures or option contracts it holds. The
inability to close out futures or options positions also could have an adverse
impact on the Portfolio's ability effectively to hedge its portfolio.
 
  When a Portfolio purchases an option on a futures contract, its risk is
limited to the amount of the premium, plus related transaction costs, although
this entire amount may be lost. In addition, in order to profit from the
purchase of an option on a futures contract, a Portfolio may be required to
exercise the option and liquidate the underlying futures contract, subject to
the availability of a liquid market. The trading of options on futures
contracts also entails the risk that changes in the value of the underlying
futures contract will not be fully reflected in the value of the option,
although the risk of imperfect correlation generally tends to diminish as the
maturity date of the futures contract or expiration date of the option
approaches.
 
  "Position Limits" are generally imposed on the maximum number of contracts
which any person may hold or control at a given time. A contract market may
order the liquidation of positions found to be in violation of these limits and
it may impose other sanctions or restrictions. The Investment Adviser does not
believe that position limits will have any adverse impact on the portfolio
strategies for hedging a Portfolio's investments.
 
  Further, the trading of futures contracts is subject to the risk of the
insolvency of a brokerage firm or the relevant exchange or clearing
corporation, which could make it difficult or impossible to liquidate existing
positions or to recover margin or other payments due.
 
  In addition to the risks of imperfect correlation and lack of a liquid
secondary market for such instruments, transactions in futures contracts
involve risks related to leveraging such that a change in the price of a
futures contract could result in substantial gains or losses. The potential for
incorrect forecasts of the direction and extent of interest rate movements
within a given time frame also involves the risk of loss in the event such
forecasts are inaccurate.
 
 
                                       42
<PAGE>
 
COMPUTATION OF OFFERING PRICE PER SHARE
   
  The offering price for Class A , Class B, Class C and Class D shares of the
Insured, National and Limited Maturity, based on the value of each Portfolio's
net asset and the number of shares outstanding as of June 30, 1996, is
calculated as set forth below.     
 
INSURED PORTFOLIO:
<TABLE>   
<CAPTION>
                               CLASS A       CLASS B      CLASS C     CLASS D
                            -------------- ------------ ----------- -----------
<S>                         <C>            <C>          <C>         <C>
Net Assets................  $1,572,834,522 $723,089,463 $18,936,443 $51,772,492
                            ============== ============ =========== ===========
Number of Shares Outstand-
 ing......................     198,801,419   91,463,092   2,394,049   6,544,245
                            ============== ============ =========== ===========
Net Asset Value Per Share
 (net assets divided by
 number of shares out-
 standing)................  $         7.91 $       7.91 $      7.91 $      7.91
Sales Charge (Class A and
 Class D shares: 4.00% of
 offering price (4.17% of
 net asset value per
 share))*.................             .33           **          **         .33
                            -------------- ------------ ----------- -----------
Offering Price............  $         8.24 $       7.91 $      7.91 $      8.24
                            ============== ============ =========== ===========
 
NATIONAL PORTFOLIO:
<CAPTION>
                               CLASS A       CLASS B      CLASS C     CLASS D
                            -------------- ------------ ----------- -----------
<S>                         <C>            <C>          <C>         <C>
Net Assets................  $  983,550,131 $399,340,242 $13,291,171 $43,884,141
                            ============== ============ =========== ===========
Number of Shares Outstand-
 ing......................      97,261,338   39,501,944   1,314,145   4,337,089
                            ============== ============ =========== ===========
Net Asset Value Per Share
 (net assets divided by
 number of shares out-
 standing)................  $        10.11 $      10.11 $     10.11 $     10.12
Sales Charge (Class A and
 Class D shares: 4.00% of
 offering price (4.17% of
 net asset value per
 share))*.................             .42           **          **         .42
                            -------------- ------------ ----------- -----------
Offering Price............  $        10.53 $      10.11 $     10.11 $     10.54
                            ============== ============ =========== ===========
 
LIMITED MATURITY PORTFOLIO:
<CAPTION>
                               CLASS A       CLASS B      CLASS C     CLASS D
                            -------------- ------------ ----------- -----------
<S>                         <C>            <C>          <C>         <C>
Net Assets................  $  417,097,299 $ 71,074,729     $94,043 $15,885,543
                            ============== ============ =========== ===========
Number of Shares Outstand-
 ing......................      42,089,848    7,170,644       9,519   1,602,198
                            ============== ============ =========== ===========
Net Asset Value Per Share
 (net assets divided by
 number of shares
 outstanding).............  $         9.91 $       9.91 $      9.88 $      9.91
Sales Charge (Class A and
 Class D shares: 1.00% of
 offering price (1.01% of
 the net asset value per
 share))*.................             .41           **          **         .41
                            -------------- ------------ ----------- -----------
Offering Price............  $        10.32 $       9.91 $      9.88 $     10.32
                            ============== ============ =========== ===========
</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 within one year of
   purchase. 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.     
 
                                      43
<PAGE>
 
INDEPENDENT AUDITORS' REPORT
 
The Board of Directors and Shareholders,
Merrill Lynch Municipal Bond Fund, Inc.:
   
We have audited the accompanying statements of assets and liabilities,
including the schedules of investments, of the Insured, National and Limited
Maturity Portfolios of Merrill Lynch Municipal Bond Fund, Inc. as of June 30,
1996, 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 June
30, 1996 by correspondence with the custodian and brokers. 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 the Insured,
National and Limited Maturity Portfolios of Merrill Lynch Municipal Bond Fund,
Inc. as of June 30, 1996, the results of their operations, the changes in their
net assets, and the financial highlights for the respective stated periods in
conformity with generally accepted accounting principles.     
 
Deloitte & Touche LLP
Princeton, New Jersey
   
August 15, 1996     
 
                                       44
<PAGE>
 
                      
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                                       45
<PAGE>
 
<TABLE>
SCHEDULE OF INVESTMENTS                                                                                     (in Thousands)
<CAPTION>
                 Municipal Bonds                                                                           Insured Portfolio

                 S&P      Moody's    Face                                                                            Value
STATE            Ratings  Ratings   Amount    Issue                                                                (Note 1a)
<C>              <C>      <C>      <C>        <S>                                                                <C>
Alabama--0.4%    AAA      Aaa      $ 1,625    Alabama Water Pollution Control Authority, Revolving Fund
                                              Loan, Series A, 6.75% due 8/15/2017 (b)                             $    1,740
                 AAA      Aaa        1,250    Mobile, Alabama, GO, Refunding and Capital Improvement
                                              Bonds, 10.875% due 11/01/2007 (c)                                        1,696
                 AAA      Aaa        6,000    Montgomery, Alabama, Special Care Facilities Financing
                                              Authority Revenue Bonds (Baptist Medical Center), Series A,
                                              5.75% due 1/01/2022 (h)                                                  5,843


Alaska--0.7%                                  Kenai Peninsula Borough, Alaska, GO (b):
                 AAA      Aaa        6,450       8.40% due 1/01/2000                                                   7,209
                 AAA      Aaa        8,460       8.40% due 1/01/2001                                                   9,677


Arizona--2.1%    AAA      Aaa        6,750    Arizona State Municipal Financing Program, COP, Series 34,
                                              7.25% due 8/01/2009 (g)                                                  7,891
                 AAA      Aaa        3,800    Maricopa County, Arizona, IDA, Health Facilities Revenue Bonds
                                              (Saint Joseph's Care Center Project), Series A, 7.75% due
                                              7/01/2020 (e)                                                            4,216
                 AAA      Aaa        4,000    Maricopa County, Arizona, IDA, Hospital Facility Revenue
                                              Refunding Bonds (Samaritan Health Services), Series A,
                                              7% due 12/01/2013 (e)                                                    4,382
                 AAA      Aaa        7,000    Maricopa County, Arizona, Unified School District No.097
                                              (Deer Valley Project), UT, 1986 Series E, 10% due 7/01/2000 (h)          8,352
                                              Mesa, Arizona, IDA, Health Care Facilities Revenue Bonds
                                              (Western Health Network)(g):
                 AAA      Aaa       10,000       Refunding, Series A-2, 7.625% due 1/01/2013                          10,806
                 AAA      Aaa        7,340       Series A-1, 7.625% due 1/01/2019                                      7,937
                 AAA      Aaa        5,000    Pima County, Arizona, Unified School District No. 1
                                              (Tucson), UT, Series C, 6.875% due 7/01/2001 (a)(e)                      5,513


California--3.0%                              California Health Facilities Financing Authority Revenue
                                              Refunding Bonds (Catholic West), VRDN (e)(f):
                 A1+      VMIG1++    5,600       Series B, 3% due 7/01/2005                                            5,600
                 A1+      VMIG1++    7,200       Series D, 3% due 7/01/2018                                            7,200
                 AAA      Aaa       10,000    East Bay, California, Municipal Utility District, Water
                                              System Revenue Bonds, Sub-Series, 6.375% due 12/01/2001 (a)(b)          10,984
                 AAA      Aaa       12,200    Los Angeles County, California, Metropolitan Transportation
                                              Authority, Sales Tax Revenue Refunding Bonds (Property A--Second
                                              Tier), 6% due 7/01/2026 (e)                                             12,231
                 AAA      Aaa        4,700    Los Angeles County, California, Transport Commission,
                                              Sales Tax Revenue Bonds, Series A, 6.75% due 7/01/2001 (a)(h)            5,216
                 AAA      Aaa        8,800    Northern California Power Agency, Multiple Capital Facilities
                                              Revenue Bonds, RIB, 9.129% due 9/02/2025 (d)(e)                          9,526
                 AAA      Aaa        6,000    Oakland, California, Redevelopment Agency, Refunding,
                                              INFLOS, 8.118% due 9/01/2019 (d)(e)                                      5,873
                 AAA      VMIG1++   11,000    Southern California Public Power Authority, Transmission
                                              Project Revenue Refunding Bonds, Series A, 5% due 7/01/2022 (e)          9,613
                 AAA      Aaa        5,000    University of California Revenue Bonds (Multiple Purpose
                                              Projects), Series D, 6.375% due 9/01/2024 (e)                            5,155


Colorado--1.2%   A1+      VMIG1++   13,980    Colorado Health Facilities Authority Revenue Bonds (North
                                              Colorado Medical Center), VRDN, 3.25% due 5/15/2020 (e)(f)              13,980
                 AAA      Aaa       10,000    Denver, Colorado, City and County Apartments, Revenue Bonds,
                                              Series A, 5.70% due 11/15/2025                                           9,776
                 AAA      Aaa        4,000    La Plata County, Colorado, Revenue Bonds (School District
                                              Number 9 & R. Durango), UT, 6.60% due 11/01/2017 (h)                     4,250


Connecticut--    AAA      Aaa        6,870    Connecticut State Health and Educational Facilities Authority
0.3%                                          Revenue Bonds (Lawrence and Memorial Hospitals), Series C, 6.25%
                                              due 7/01/2002 (a)(e)                                                     7,473


Delaware--0.5%   AAA      Aaa        6,000    Delaware State EDA, PCR, Refunding (Delmarva Power and Light
                                              Company), Series B, 7.30% due 3/01/2014 (e)                              6,564
                 AAA      Aaa        3,750    Delaware State Health Facilities Authority, Crossover
                                              Refunding (Medical Center of Delaware), 7% due 10/01/2015 (e)            4,040


Florida--7.5%    AAA      Aaa        4,000    Dade County, Florida, School District, UT, 6.125% due
                                              8/01/2001 (a)(h)                                                         4,255
                 A1+      VMIG1++   28,800    Dade County, Florida, Water and Sewer System Revenue
                                              Bonds, VRDN, 3.30% due 10/05/2022 (f)(h)                                28,800
</TABLE> 




                                      46
<PAGE>
 
<TABLE> 
<C>              <C>      <C>      <C>        <S>                                                                <C>
                 AAA      Aaa        5,000    Florida State Division, Bond Finance Department, General
                                              Services Revenue Bonds (Department of Natural Resource
                                              Preservation), Series 2000-A, 6.75% due 7/01/2013 (b)                    5,365
                                              Florida State Municipal Power Agency Revenue Bonds (All
                                              Requirements Power Supply Project)(a)(b):
                 AAA      Aaa        9,250       6.25% due 10/01/2002                                                 10,120
                 AAA      Aaa        2,340       Refunding, 6.25% due 10/01/2001                                       2,544
                 AAA      Aaa        3,030    Florida State Turnpike Authority, Turnpike Revenue Bonds,
                                              Series A, 6.35% due 7/01/2002 (a)(h)                                     3,300
                 AAA      Aaa        5,950    Hollywood, Florida, Water and Sewer Revenue Bonds, 6.875%
                                              due 10/01/2001 (a)(h)                                                    6,639
                                              Jacksonville, Florida, Health Facilities Authority, Hospital
                                              Revenue Refunding and Improvement Bonds (Baptist Medical
                                              Center Project):
                 AAA      Aaa          500       11.50% due 10/01/2012 (c)                                               805
                 AAA      Aaa       26,500       Series A, 7.30% due 6/01/2019 (e)                                    28,695
                 AAA      Aaa        8,750    Jacksonville, Florida, Port Authority Revenue Bonds, AMT,
                                              7.875% due 11/01/2018 (g)                                                9,030
                 AAA      Aaa       10,000    Lee County, Florida, Hospital Board of Directors, Hospital
                                              Revenue Bonds, INFLOS, 9.241% due 4/01/2020 (d)(e)                      10,750
                 AAA      Aaa       16,700    Martin County, Florida, PCR, Refunding (Florida Power and
                                              Light Company Project), 7.30% due 7/01/2020 (e)                         18,296
                 AAA      Aaa       11,525    Orange County, Florida, Health Facilities Authority,
                                              Revenue Refunding Bonds (Pooled Hospital Loan), Series B,
                                              7.875% due 12/01/2025 (g)                                               12,073
                 AAA      Aaa        3,950    Orange County, Florida, HFA, Mortgage Revenue Refunding
                                              Bonds, Series A, 7.60% due 1/01/2024 (h)(j)                              4,180
                                              Orlando and Orange County, Florida, Expressway Authority,
                                              Revenue Refunding Bonds, Junior-Lien, Series A (h):
                 AAA      Aaa        3,960       5% due 7/01/2017                                                      3,547
                 AAA      Aaa       10,455       5.125% due 7/01/2020                                                  9,409
                 AAA      Aaa       12,500    Reedy Creek, Florida, Improvement District, Florida Utilities
                                              Revenue Refunding Bonds, Series 1, 5% due 10/01/2019 (e)                11,071
                 AAA      Aaa        2,850    South Broward, Florida, Hospital District Revenue Bonds, RIB,
                                              Series C, 9.29% due 5/01/2001 (a)(b)(d)                                  3,367
                 AAA      Aaa        2,000    Tampa, Florida, Water and Sewer Revenue Refunding Bonds,
                                              Sub-Lien, Series A, 7.25% due 10/01/2016 (b)                             2,131
                 AAA      Aaa        2,240    West Coast Regional Water Supply Authority, Florida, Capital
                                              Improvement Revenue Bonds (Hillsborough County Project),
                                              10.40% due 10/01/2010 (a)(b)                                             3,154


Georgia--4.3%    A1+      VMIG1++    6,200    Burke County, Georgia, Development Authority, PCR (Oglethorpe
                                              Power Corporation), VRDN, Series A, 3.30% due 1/01/2016 (f)(h)           6,200
                 AAA      Aaa       10,500    Chatam County, Georgia, School District, UT, 6.75%
                                              due 8/01/2003 (a)(e)                                                    11,773
                                              Georgia Municipal Electric Authority, Power Revenue Bonds:
                 AAA      Aaa       12,100       Refunding, Series Z, 5.50% due 1/01/2012 (h)                         12,013
                 AAA      Aaa        7,400       Refunding, Series Z, 5.50% due 1/01/2012 (i)                          7,347
                 AAA      Aaa       11,545       Refunding, Series Z, 5.50% due 1/01/2020 (h)                         11,089
                 AAA      Aaa       20,000       Series EE, 7% due 1/01/2025 (b)                                      23,296
                 A1+      VMIG1++   17,400    Glynn-Brunswick Memorial Hospital Authority, Georgia,
                                              Anticipation Certificates, Revenue Refunding Bonds (Southeast
                                              Georgia Project), VRDN, 3.30% due 8/01/2016 (e)(f)                      17,400
                 AAA      Aaa        3,990    Metropolitan Atlanta, Rapid Transit Authority, Georgia, Sales
                                              Tax Revenue Refunding Bonds, Second Indenture Series,
                                              Series A, 5.125% due 7/01/2019 (b)                                       3,641
                 AAA      Aaa        9,000    Municipal Electric Authority, Georgia, Special Obligation
                                              Bonds (Fifth Crossover Series, Project One), 6.40% due 1/01/2013 (b)     9,729
</TABLE>

Portfolio
Abbreviations

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

ACES SM      Adjustable Convertible Extendible Securities
AMT          Alternative Minimum Tax (Subject to)
BAN          Bond Anticipation Notes
COP          Certificates of Participation
DATES        Daily Adjustable Tax-Exempt Securities
EDA          Economic Development Authority
GO           General Obligation Bonds
HDA          Housing Development Authority
HFA          Housing Finance Agency
IDA          Industrial Development Authority
IDR          Industrial Development Revenue Bonds
INFLOS       Inverse Floating Rate Municipal Bonds
LEVRRS       Leveraged Reverse Rate Securities
PCR          Pollution Control Revenue Bonds
RIB          Residual Interest Bonds
S/F          Single-Family
UPDATES      Unit Priced Demand Adjustable
             Tax-Exempt Securities
UT           Unlimited Tax
VRDN         Variable Rate Demand Notes




                                      47
<PAGE>
 
<TABLE>
<CAPTION>
SCHEDULE OF INVESTMENTS (continued)                                                                        (in Thousands)
                 Municipal Bonds                                                                          Insured Portfolio

                 S&P      Moody's    Face                                                                            Value
STATE            Ratings  Ratings   Amount    Issue                                                                (Note 1a)
<C>              <C>      <C>      <C>        <S>                                                                <C>
Hawaii--3.2%                                  Hawaii State Airports System Revenue Bonds:
                 AAA      Aaa      $21,795       AMT, 7.30% due 7/01/2020 (b)                                     $   23,679
                 AAA      Aaa       23,200       AMT, Second Series, 7.50% due 7/01/2020 (h)                          25,371
                 AAA      Aaa       10,000       Refunding, Series 1993, 6.45% due 7/01/2013 (e)                      10,566
                                              Hawaii State Department of Budget and Finance, Special
                                              Purpose Mortgage Revenue Bonds (Hawaiian Electric Company,
                                              Inc. Project), AMT (e):
                 AAA      Aaa        4,340       7.625% due 12/01/2018                                                 4,730
                 AAA      Aaa        5,000       Series C, 7.375% due 12/01/2020                                       5,471
                 AAA      Aaa        4,500    Hawaii State Harbor, Capital Improvement Revenue Bonds,
                                              AMT, 7% due 7/01/2017 (e)                                                4,814


Illinois--7.0%   AAA      Aaa       11,000    Chicago, Illinois, GO, Series A-1, 5.125% due 1/01/2025 (b)              9,734
                                              Chicago, Illinois, Public Building Commission Revenue Bonds (c):
                 AAA      Aaa       25,000       (Community College District No. 508), Series B, 8.75%
                                                 due 1/01/2007 (g)                                                    26,548
                 AAA      Aaa       25,000       Series A, 7.125% due 1/01/2015 (e)                                   26,794
                 AAA      Aaa        6,000    Chicago, Illinois, Refunding, Series B, 5.125% due 1/01/2025 (h)         5,309
                 AAA      Aaa       19,000    Chicago, Illinois, Wastewater Transmission Revenue
                                              Refunding Bonds, 5.125% due 1/01/2025 (h)                               16,790
                                              Chicago, Illinois, Water Revenue Bonds (h):
                 AAA      Aaa        3,000       5% due 11/01/2015                                                     2,684
                 AAA      Aaa        3,000       5% due 11/01/2020                                                     2,625
                 AAA      Aaa       10,000       5% due 11/01/2025                                                     8,651
                                              Illinois Health Facilities Authority Revenue Bonds:
                 AAA      Aaa        3,250       (Elmhurst Memorial Hospital), 6.625% due 1/01/2022 (h)                3,399
                 AAA      Aaa        2,000       (Methodist Health Project), RIB, 9.821% due 5/01/2021 (b)(d)          2,223
                 AAA      Aaa       10,000       (Rush Presbyterian-Saint Luke's Medical Center),
                                                 INFLOS, 9.585% due 10/01/2024 (d)(e)                                 11,050
                 AAA      Aaa        6,600    Metropolitan Pier and Exposition Authority, Illinois,
                                              Dedicated State Tax Revenue Bonds (McCormick Place Expansion
                                              Project), Series A, 6.50% due 6/15/2027 (b)                              6,905
                                              Regional Transportation Authority, Illinois:
                 AAA      Aaa       38,025       Refunding, 5.60% due 6/01/2025 (e)                                   35,847
                 AAA      Aaa        6,000       Series A, 6.25% due 6/01/2024 (b)                                     6,066


Indiana--2.0%    AAA      Aaa        2,470    Indiana State Employment Development Commission,
                                              Environmental Revenue Bonds (Public Service Company of
                                              Indiana, Inc.), AMT, 7.50% due 3/15/2015 (e)                             2,681
                 AAA      Aaa        4,000    Indiana State Municipal Power Agency, Power Supply
                                              System Revenue Bonds, Series A, 6.125% due 1/01/2019 (e)                 4,044
                 AAA      Aaa        4,040    Indianapolis, Indiana, Local Public Improvement Bond
                                              Bank, Series A, 7.90% due 2/01/2002 (a)(g)                               4,639
                 AAA      Aaa        4,340    Jasper County, Indiana, PCR, Refunding (Northern Indiana
                                              Public Service), 7.10% due 7/01/2017 (e)                                 4,718
                                              Rockport, Indiana, PCR, Refunding:
                 A1       Aaa        4,600       (AEP Generating Company Project), VRDN, Series A,
                                                 3.60% due 7/01/2025 (b)(f)                                            4,600
                 A1       Aaa        3,000       (AEP Generating Company Project), VRDN, Series B,
                                                 3.65% due 7/01/2025 (b)(f)                                            3,000
                 AAA      Aaa        3,550       (Indiana--Michigan Power Company Project), Series B,
                                                 7.60% due 3/01/2016 (h)                                               3,976
                 A1       Aaa       19,100       (Indiana--Michigan Power Company Project), VRDN, Series B,
                                                 3.25% due 6/01/2025 (b)(f)                                           19,100


Iowa--0.2%       AAA      Aaa        5,000    Des Moines, Iowa, Parking Facilities Revenue Bonds,
                                              Series A, 7.25% due 7/01/2015 (h)                                        5,420


Kentucky--0.7%   AAA      Aaa       11,470    Kentucky Development Finance Authority, Hospital Revenue
                                              Refunding and Improvement Bonds (Saint Elizabeth Medical
                                              Center), Series A, 9% due 11/01/2000 (h)                                13,376
                 AAA      Aaa        3,050    Kentucky State Property and Buildings Commission Revenue
                                              Bonds, Project No. 50, 6% due 2/01/2001 (a)(e)                           3,208

Maryland--0.5%   AAA      Aaa        3,000    Baltimore, Maryland, Revenue Refunding Bonds (Kidder Maryland
                                              Water Projects), Series A, 5.65% due 7/01/2020 (e)                       2,904
                                              Maryland State Health and Higher Educational Facilities Authority
                                              Revenue Bonds (University of Maryland Medical Systems)(h):
</TABLE> 

                                      48
<PAGE>
 
<TABLE> 
<C>             <C>      <C>        <C>       <S>                                                                  <C> 
                 AAA      Aaa        2,250       Series A, 7% due 7/01/2001 (a)                                        2,507
                 AAA      Aaa        4,400       Series B, 7% due 7/01/2022                                            5,144

Massachusetts--  AAA      Aaa       13,000    Massachusetts Bay Transportation Authority, COP,
5.2%                                          Series A, 7.65% due 8/01/2000 (a)(i)                                    14,648
                 AAA      Aaa       10,000    Massachusetts Bay Transportation Authority (Massachusetts
                                              General Transportation), Series B, 5.375% due 3/01/2025 (b)              9,303
                 AAA      Aaa        4,780    Massachusetts Educational Loan Authority, Education Loan
                                              Revenue Bonds, AMT, Issue D, Series A, 7.25% due 1/01/2009 (e)           5,106
                 AAA      Aaa        3,250    Massachusetts Port Authority Revenue Bonds, 13% due 7/01/2013 (c)        5,323
                                              Massachusetts State Health and Educational Facilities 
                                              Authority Revenue Bonds:
                 AAA      Aaa       10,000       (Beth Israel), INFLOS, 8.319% due 7/01/2025 (b)(d)                    9,700
                 A1       VMIG1++    1,695       (Capital Asset Program), VRDN, Series B, 3.35%
                                                 due 7/01/2005 (e)(f)                                                  1,695
                 SP1+     VMIG1++   43,000       (Capital Asset Program), VRDN, Series D, 3.60%
                                                 due 1/01/2035 (e)(f)                                                 43,000
                 AAA      Aaa        3,100       (Saint Elizabeth's Hospital), LEVRRS, Series E, 9.88%
                                                 due 8/12/2021 (d)(i)                                                  3,410
                 AAA      Aaa       19,755    Massachusetts State HFA, Housing Revenue Refunding Bonds
                                              (Insured Rental), AMT, Series A, 6.75% due 7/01/2028 (b)                20,334
                 AAA      Aaa        5,500    Massachusetts State Industrial Finance Agency Revenue Bonds
                                              (Brandeis University), Series C, 6.80% due 10/01/2019 (e)                5,824
                 AAA      Aaa        5,850    Massachusetts State Turnpike Authority, Turnpike Revenue
                                              Refunding Bonds, Series A, 5.125% due 1/01/2023 (h)                      5,217

Michigan--3.3%   AAA      Aaa        5,500    Chippewa Valley, Michigan Schools (School Building and
                                              Sites), UT, 6.375% due 5/01/2001 (a)(h)                                  5,943
                 AAA      Aaa        3,350    Detroit, Michigan, City School District UT, 7.10% due
                                              5/01/2001 (a)(e)                                                         3,737
                 AAA      Aaa       10,900    Detroit, Michigan, Water Supply System Revenue Bonds,
                                              INFLOS, 8.821% due 7/01/2002 (a)(d)(h)                                  12,753
                 AAA      Aaa        5,000    Kent Hospital Finance Authority, Michigan, Healthcare
                                              Revenue Bonds (Butterworth Health Systems), Series A, 5.625%
                                              due 1/15/2026 (e)                                                        4,742
                 AAA      Aaa       10,000    Michigan State Strategic Fund, Limited Obligation Revenue 
                                              Refunding Bonds (Detroit Edison Co.), Series AA, 6.40%
                                              due 9/01/2025 (e)                                                       10,404
                                              Monroe County, Michigan, PCR (Detroit Edison Company
                                              Project), AMT: 
                 AAA      Aaa       16,500       (Monroe and Fermi Plants), Series 1, 7.65% due 9/01/2020 (h)         18,160
                 AAA      Aaa        9,745       Series I-B, 7.50% due 9/01/2019 (b)                                  10,671
                                              Oxford, Michigan, Area Community School District
                                              (Building and Site), UT (h):
                 AAA      Aaa        6,300       5.50% due 5/01/2021                                                   6,005
                 AAA      Aaa        5,000       5.40% due 5/01/2025                                                   4,662
                 AAA      Aaa        1,000    Riverview, Michigan, Community School District Building,
                                              UT, 6.55% due 5/01/2002 (a)(h)                                           1,097

Mississippi--    AAA      Aaa        1,320    Harrison County, Mississippi, Wastewater Management District,
0.1%                                          Revenue Refunding Bonds (Wastewater Treatment Facilities), 
                                              Series A, 8.50% due 2/01/2013 (h)                                        1,728

Missouri--0.3%   AAA      Aaa        4,000    Kansas City, Missouri, Municipal Assistance Corporation
                                              Revenue Bonds (Leasehold Improvement--H-Roe Bartle),
                                              Series B, 6% due 4/15/2001 (a)(b)                                        4,215
                 AAA      Aaa        3,500    Sikeston, Missouri, Electric Revenue Refunding Bonds,
                                              6.25% due 6/01/2002 (a)(e)                                               3,804

Nebraska--0.4%   AAA      Aaa        9,000    Nebraska Public Power District Revenue Refunding Bonds,
                                              6.125% due 1/01/2015 (e)                                                 9,188

Nevada--2.2%     AAA      Aaa        5,000    Washoe County, Nevada, Airport Authority, Airport System
                                              Improvement Revenue Bonds, Series A, 5.70% due 7/01/2026 (e)             4,867
                 AAA      Aaa       45,000    Washoe County, Nevada, Water Facility Revenue Bonds
                                              (Sierra Pacific Power), AMT, 6.65% due 6/01/2017 (e)                    47,277

New Jersey--5.5% AAA      Aaa        3,350    Cape May County, New Jersey, Industrial Pollution Control
                                              Financing Authority, Revenue Refunding Bonds (Atlantic City
                                              Electric Company), Series A, 6.80% due 3/01/2021 (e)                     3,820
                 AAA      Aaa       14,000    Delaware River Port Authority of Pennsylvania and New Jersey,
                                              Revenue Bonds, Series 1995, 5.50% due 1/01/2026 (h)                     13,353
                 AAA      Aaa        2,000    Hoboken, Union City, and Weehawken, New Jersey, Sewage Authority,
                                              Sewer Revenue Bonds, 7.25% due 8/01/1999 (a)(e)                          2,191
                 AAA      Aaa       28,750    New Jersey EDA, Natural Gas Facilities Revenue Refunding Bonds
                                              (NUI Corp.), Series A, 6.35% due 10/01/2022 (b)                         29,889
                 A1+      VMIG1++   10,000    New Jersey Sports and Exposition Authority (State Contract),
                                              VRDN, Series C, 3.10% due 9/01/2024 (e)(f)                              10,000
                 AAA      Aaa        5,165    New Jersey State Educational Facilities Authority Revenue
                                              Bonds (New Jersey Institute of Technology), Series D, 6.25%
                                              due 7/01/2001 (a)(b)                                                     5,543
</TABLE>

                                      


                                      49
<PAGE>
 
<TABLE>
SCHEDULE OF INVESTMENTS (continued)                                                                         (in Thousands)
<CAPTION>
                 Municipal Bonds                                                                           Insured Portfolio

                 S&P      Moody's    Face                                                                             Value
STATE            Ratings  Ratings   Amount    Issue                                                                 (Note 1a)
<C>              <C>      <C>      <C>        <S>                                                                 <C>
New Jersey                                    New Jersey State Housing and Mortgage Finance Agency, Home
(concluded)                                   Buyer Revenue Bonds, AMT (e):
                 AAA      Aaa      $ 5,640       Series B, 7.90% 10/01/2022                                        $   5,909
                 AAA      Aaa       10,390       Series D, 7.70% due 10/01/2029                                       10,798
                 AAA      Aaa       23,890       Series M, 7% due 10/01/2026                                          24,887
                 AAA      VMIG1++   23,400    New Jersey State Turnpike Authority, Turnpike Revenue
                                              Refunding Bonds, VRDN, Series D, 3% due 1/01/2018 (f)(h)                23,400

New York--5.3%   AAA      Aaa        9,650    Metropolitan Transportation Authority, New York, Service
                                              Contract, Refunding (Transportation Facilities), Series L,
                                              7.50% due 7/01/2017 (b)                                                 10,361
                 AAA      Aaa        1,550    New York City, New York, GO, UT, Series C, Sub-Series C-1,
                                              6.625% due 8/01/2002 (a)(e)                                              1,716
                                              New York City, New York, GO, UT, Series I (b):
                 AAA      Aaa        7,150       7.25% due 8/15/2013                                                   7,682
                 AAA      Aaa       10,130       7.25% due 8/15/2016                                                  10,958
                                              New York City, New York, Municipal Water Finance Authority,
                                              Water and Sewer System Revenue Bonds:
                 AAA      Aaa        1,090       Series A, 6.75% due 6/15/1999 (a)(h)                                  1,173
                 AAA      Aaa        2,000       Series B, 5.75% due 6/15/2026 (e)                                     1,961
                 AAA      Aaa        4,510       Series C, 6.20% due 6/15/2021 (b)                                     4,603
                 AAA      VMIG1++   11,500       VRDN, Series C, 3.60% due 6/15/2023 (f)(h)                           11,500
                 AAA      VMIG1++   12,600       VRDN, Series G, 3.60% due 6/15/2024 (f)(h)                           12,600
                 AAA      Aaa       10,705    New York State Dormitory Authority Revenue Bonds (City
                                              University System), Third Generation, Series 1, 5.375% due
                                              7/01/2025 (b)                                                            9,999
                 AAA      Aaa       31,765    New York State Energy Research and Development Authority,
                                              Gas Facilities Revenue Refunding Bonds (Brooklyn Union Gas
                                              Company), Series A, 5.50% due 1/01/2021 (e)                             30,327
                 AAA      Aaa        3,085    New York State Medical Care Facilities Finance Agency Revenue
                                              Bonds (Mental Health Services Improvement), Series C, 7.375%
                                              due 8/15/2019 (e)                                                        3,355
                                              New York State Thruway Authority, General Revenue Bonds:
                 AAA      Aaa        6,400       Series B, 5% due 1/01/2020 (e)                                        5,702
                 AAA      VMIG1++    5,900       VRDN, 3.55% due 1/01/2024 (f)(h)                                      5,900
                                              Niagara Falls, New York, Public Improvement Bonds, UT (e):
                 AAA      Aaa        2,975       6.90% due 3/01/2023                                                   3,237
                 AAA      Aaa        3,190       6.90% due 3/01/2024                                                   3,471
                 AAA      Aaa        1,235    Suffolk County, New York, Water Authority, Waterworks Revenue
                                              Refunding Bonds, 7.375% due 6/01/2012 (b)                                1,331

North Carolina-- AAA      Aaa        3,000    Charlotte, North Carolina, COP (Convention Facility Project),
0.5%                                          6.75% due 12/01/2001 (a)(b)                                              3,335
                 A2       VMIG1++    9,500    North Carolina Medical Care Commission, Hospital Revenue Bonds
                                              (Pooled Equipment Financing Project), ACES, 3.70% due
                                              12/01/2025 (e)(f)                                                        9,500

Ohio--1.4%       AAA      Aaa        2,710    Clermont County, Ohio, Hospital Facilities Revenue Refunding
                                              Bonds (Mercy Health Systems--Province of Cincinnati),
                                              Series A, 7.50% due 9/01/2001 (a)(b)                                     3,043
                 AAA      Aaa        5,400    Clermont County, Ohio, Sewer System Revenue Bonds, 7.10%
                                              due 12/01/2001 (a)                                                       6,079
                 AAA      Aaa       12,000    Cleveland, Ohio, Public Power System Revenue Bonds, First
                                              Mortgage, Series A, 7% due 11/15/2024 (e)                               13,253
                 AAA      Aaa        5,915    Fairfield County, Ohio, Hospital Improvement Revenue Bonds  
                                              (Lancaster-Fairfield Community Hospital), Series A, 7.10%
                                              due 6/15/2001 (a)(e)                                                     6,611
                 AAA      Aaa        3,495    Ohio State Water Development Authority, Revenue Refunding
                                              Bonds (Cincinnati Gas), Series A, 5.45% due 1/01/2024 (e)                3,305

Oklahoma--1.4%   AAA      Aaa        7,500    Oklahoma State Industrial Authority, Hospital Revenue Bonds
                                              (Baptist Medical Center of Oklahoma), Series A, 7% due
                                              8/15/2000 (a)(b)                                                         8,261
                 AAA      Aaa       21,560    Tulsa, Oklahoma, Industrial Authority, Hospital Revenue
                                              Bonds (Saint John's Medical Center, Inc.), 7.25% due
                                              12/01/1999 (a)(e)                                                       23,755
</TABLE> 



                                      50
<PAGE>
 
<TABLE> 
<C>             <C>      <C>        <C>       <S>                                                                    <C>       
Oregon--0.2%     AAA      Aaa        4,000    Port Portland International Airport Revenue Bonds (Portland
                                              International Airport), AMT, Series 7-B, 7.10% due 7/01/2021 (e)         4,326

Pennsylvania--                                Allegheny County, Pennsylvania, Hospital Development
7.2%                                          Authority Revenue Bonds:
                 AAA      Aaa        1,750       (Mercy Hospital of Pittsburgh), 6.75% due 4/01/2021 (b)               1,853
                 A1+      VMIG1++    1,195       (Presbyterian Health Center), VRDN, Series B, 3.55%
                                                 due 3/01/2020 (e)(f)                                                  1,195
                 AAA      Aaa        6,900    Beaver County, Pennsylvania, Hospital Authority Revenue
                                              Bonds (Medical Center of Beaver, Pennsylvania Inc.),
                                              Series A, 6.25% due 7/01/2022 (b)                                        6,969
                 AAA      Aaa        3,365    Beaver County, Pennsylvania, IDA, PCR, Refunding (Ohio
                                              Edison Company/Mansfield), Series A, 7% due 6/01/2021 (h)                3,673
                 AAA      Aaa        5,300    Lehigh County, Pennsylvania, General Purpose Authority Revenue
                                              Bonds (Lehigh Valley Hospital), Series B, 5.625% due 7/01/2025 (e)       5,070
                                              Pennsylvania State Higher Education Assistance Agency,
                                              Student Loan Revenue Bonds, AMT, RIB (d):
                 AAA      Aaa       15,000       9.622% due 9/03/2026 (b)                                             16,406
                 AAA      Aaa        8,000       Series B, 11.033% due 3/01/2020 (e)                                   9,090
                 AAA      Aaa       18,600       Series B, 8.329% due 3/01/2022 (b)                                   18,205
                                              Pennsylvania State Higher Educational Facilities Authority,
                                              College and University Revenue Bonds:
                 AAA      Aaa        1,500       (Bryn Mawr College), 6.50% due 12/01/2009 (h)                         1,579
                 AAA      Aaa        4,250       (Temple University), First Series, 6.50% due 4/01/2021 (e)            4,424
                 AAA      Aaa        1,150    Pennsylvania State Turnpike Commission, Turnpike Revenue Bonds,
                                              Series H, 7.10% due 12/01/2000 (a)(h)                                    1,279
                                              Philadelphia, Pennsylvania, Airport Revenue Bonds, AMT (e):
                 AAA      Aaa        8,150       7.75% due 6/15/2015                                                   8,750
                 AAA      Aaa       24,000       7.375% due 6/15/2018                                                 25,601
                                              Philadelphia, Pennsylvania, Gas Works Revenue Bonds:                          
                 AAA      Aaa        5,000       12th Series B, 7% due 5/15/2020 (c)(e)                                5,760
                 AAA      Aaa        2,600       15th Series 3, 5.25% due 8/01/2024 (i)                                2,369
                 AAA      Aaa        5,750    Philadelphia, Pennsylvania, Parking Authority, Airport Parking
                                              Revenue Bonds, 7.375% due 9/01/2018 (b)                                  6,185
                 AAA      Aaa       30,150    Philadelphia, Pennsylvania, School District, Series B, 5.50%
                                              due 9/01/2025 (b)                                                       28,398
                 AAA      Aaa        4,610    Philadelphia, Pennsylvania, Water and Wastewater Revenue
                                              Bonds, 5.50% due 8/01/2014 (e)                                           4,491
                 AAA      Aaa        2,000    Pittsburgh, Pennsylvania, Water and Sewer Authority, Water
                                              and Sewer System Revenue Refunding Bonds, Series A, 6%
                                              due 9/01/2001 (a)(h)                                                     2,114
                 AAA      Aaa       15,870    Somerset County, Pennsylvania, General Authority Commonwealth,
                                              Lease Revenue Bonds, 6.25% due 10/15/2001 (a)(h)                        16,980

Rhode Island     AAA      Aaa        6,100    Rhode Island Depositors Economic Protection Corporation,
- --0.9%                                        Special Obligation Bonds, Series A, 6.625% due 8/01/2002 (a)(i)          6,729
                 AAA      Aaa       12,800    Rhode Island State Health and Educational Building Corporation
                                              Revenue Bonds (Rhode Island Hospital), INFLOS, 9.715%
                                              due 8/15/2021 (d)(h)                                                    14,384

South Carolina   AAA      Aaa        5,000    Florence County, South Carolina, Hospital Revenue Bonds
- --1.8%                                        (McLeod Regional Medical Center Project), 6.75% due 11/01/2020 (h)       5,293
                 AAA      Aaa        3,500    Pickens and Richland Counties, South Carolina, Hospital
                                              Facilities Revenue Bonds (South Carolina Baptist Hospital),
                                              Series A, 7% due 8/01/2001 (a)(b)                                        3,889
                 AAA      Aaa        4,000    Piedmont, Municipal Power Agency, South Carolina, Electric
                                              Revenue Refunding Bonds, 6.30% due 1/01/2022 (e)                         4,114
                                              South Carolina State Public Service Authority, Revenue
                                              Refunding Bonds, Series A:
                 AAA      Aaa       13,155       5.50% due 7/01/2021 (e)                                              12,554
                 AAA      Aaa       17,090       6.375% due 7/01/2021 (b)                                             17,635

Tennessee--      AAA      Aaa        1,905    Jackson, Tennessee, Water and Sewer Revenue Bonds,
0.1%                                          10.375% due 7/01/2012 (b)                                                2,232

Texas--17.1%                                  Austin, Texas, Utility System, Combined Revenue Bonds (e):
                 AAA      Aaa       11,190       Prior Lien, 9.25% due 5/15/2004 (a)                                  14,218
                 AAA      Aaa       30,000       Refunding, 5.60% due 5/15/2025                                       28,918
                                              Brazos River Authority, Texas, PCR (Texas Utilities Electric
                                              Company Project), AMT:
                 AAA      Aaa        6,000       Refunding, 6.50% due 12/01/2027 (b)                                   6,192
                 AAA      Aaa       12,000       Series B, 6.625% due 6/01/2022 (h)                                   12,582
                 AAA      Aaa       13,900    Brazos River Authority, Texas, Revenue Refunding Bonds
                                              (Houston Light and Power Co.), Series B, 7.20% due 12/01/2018 (h)       15,159
</TABLE>



                                      51
<PAGE>
 
<TABLE> 
SCHEDULE OF INVESTMENTS (concluded)                                                                         (in Thousands)
<CAPTION>
                 Municipal Bonds                                                                           Insured Portfolio

                 S&P      Moody's    Face                                                                             Value
STATE            Ratings  Ratings   Amount    Issue                                                                 (Note 1a)
<C>              <C>      <C>      <C>        <S>                                                                 <C>
Texas            AAA      Aaa      $20,000    Brownsville, Texas, Utility System Revenue Refunding Bonds,
(concluded)                                   6.25% due 9/01/2014 (e)                                             $   21,303
                 AAA      Aaa        5,000    Harris County, Texas, Hospital District Mortgage, Revenue
                                              Refunding Bonds, 7.40% due 2/15/2010 (b)                                 5,881
                                              Harris County, Texas, Toll Road Revenue Bonds, Senior Lien:
                 AAA      Aaa       13,045       Refunding, 5.30% due 8/15/2013 (b)                                   12,465
                 AAA      Aaa        2,250       Refunding, 5% due 8/15/2016 (h)                                       2,038
                 AAA      Aaa       42,870       Refunding, 5.375% due 8/15/2020 (h)                                  40,146
                 AAA      Aaa        1,000       Refunding, Series A, 6.40% due 8/15/2002 (a)(h)                       1,097
                 AAA      Aaa       20,430       Refunding, Series A, 6.50% due 8/15/2002 (a)(b)                      22,514
                 AAA      Aaa       10,305       Refunding, Series A, 6.50% due 8/15/2002 (a)(h)                      11,356
                 AAA      Aaa        2,750       Series A, 6.50% due 8/15/2017 (b)                                     2,880
                 AAA      Aaa       11,100       Series A, 6.375% due 8/15/2024 (e)                                   11,497
                 AAA      Aaa        1,695    Harris County, Texas, Toll Road Revenue Bonds, Series A,
                                              6.50% due 8/15/2011 (h)                                                  1,790
                                              Houston, Texas, Water and Sewer System Revenue Bonds,
                                              Junior Lien, Series A:
                 AAA      Aaa        9,375       6.375% due 12/01/2022 (e)                                             9,667
                 AAA      Aaa       35,180       Refunding, 5.375% due 12/01/2018 (h)                                 33,274
                 AAA      Aaa        8,000       Refunding, 6.20% due 12/01/2023 (e)                                   8,165
                 AAA      Aaa        3,500    Houston, Texas, Water Conveyance System Contract, COP,
                                              Series J, 6.25% due 12/15/2013 (b)                                       3,743
                 AAA      Aaa          650    Lower Colorado River Authority, Texas, Revenue Refunding
                                              Bonds, Series B, 7% due 1/01/2001 (a)(b)                                   720
                                              Matagorda County, Texas, Navigation District No. 1 (Houston
                                              Light and Power Co.):
                 AAA      Aaa        8,250       AMT, PCR, Series D, 7.60% due 10/01/2019 (h)                          9,030
                 AAA      Aaa       11,800       Refunding, Series A, 6.70% due 3/01/2027 (b)                         12,601
                 AAA      Aaa       26,305       Refunding, Series C, 7.125% due 7/01/2019 (h)                        28,378
                 AAA      Aaa        5,000    Matagorda County, Texas, Navigation District No. 1, PCR (Central
                                              Power and Light Company Project), AMT, 7.50% due 3/01/2020 (b)           5,427
                 A1       VMIG1++    8,850    Sabine River Authority, Texas, PCR, Refunding (Texas Utilities
                                              Project), VRDN, Series A, 3.65% due 3/01/2026 (b)(f)                     8,850
                 AAA      Aaa        3,000    San Antonio, Texas, Electric and Gas Revenue Bonds, Series 95,
                                              5.375%  due 2/01/2016 (e)                                                2,852
                 AAA      Aaa       15,000    Southwest Higher Education Authority Incorporated, Texas,
                                              Revenue Refunding Bonds (Southern Methodist University),
                                              Series B, 6.25% due 10/01/2022 (h)                                      15,289
                                              Texas State Municipal Power Agency, Revenue Refunding Bonds:
                 AAA      Aaa        4,775       5.75% due 9/01/2002 (a)(e)                                            5,004
                 AAA      Aaa        3,150       Series A, 6.75% due 9/01/2012 (b)                                     3,384
                 AAA      Aaa       53,750    Texas State Turnpike Authority Revenue Bonds (Dallas North
                                              Thruway--President George Bush Turnpike), 5.25% due 1/01/2023 (h)       49,230

Utah--1.9%       A1+      VMIG1++   11,600    Emery County, Utah, PCR, Refunding (Pacificorp Projects), VRDN,
                                              3.60% due 11/01/2024 (b)(f)                                             11,600
                 AAA      Aaa       15,800    Murray City, Utah, Hospital Revenue Bonds (IHC Health Services
                                              Inc.), 5% due 5/15/2022 (e)                                             13,736
                 AAA      Aaa       14,000    Salt Lake City, Utah, Hospital Revenue Refunding Bonds (IHC
                                              Hospitals, Inc.), INFLOS, 9.566% due 5/15/2020 (b)(d)                   15,523
                 AA-      Aaa        1,000    Uinta County, Utah, PCR (National Rural Utilities--Deseret),
                                              Series 1984 F-2, 10.50% due 6/15/2001 (a)                                1,245
                 AAA      Aaa        2,650    Utah State Board of Regents, Student Loan Revenue Bonds, AMT,
                                              Series F, 7.45% due 11/01/2008 (b)                                       2,750

Vermont--0.8%    AAA      Aaa       18,950    Vermont, HFA, Home Mortgage Purchase Bonds, AMT, Series B,
                                              7.60% due 12/01/2024 (e)                                                19,896

Virginia--2.8%   AAA      Aaa        5,000    Danville, Virginia, IDA, Hospital Revenue Refunding Bonds
                                              (Danville Regional Medical Center), 6.50% due 10/01/2019 (h)             5,244
                 AAA      Aaa        5,000    Prince William County, Virginia, Service Authority, Water
                                              and Sewer System Revenue Bonds, 6.50% due 7/01/2001 (a)(h)               5,460
                                              Upper Occoquan Sewer Authority, Virginia, Regional Sewer
                                              Revenue Bonds (e):
                 AAA      Aaa       11,000       6% due 7/01/2001 (a)                                                 11,596
                 AAA      Aaa       10,000       Series A, 5% due 7/01/2025                                            8,732
</TABLE> 



                                      52
<PAGE>
 
<TABLE> 
<C>             <C>      <C>        <C>       <S>                                                                <C>         
                                              Virginia State, HDA, Commonwealth Mortgage, AMT, Series A,
                                              Sub-Series A-4 (e):
                 AAA      Aaa        5,000       6.30% due 7/01/2014                                                   5,065
                 AAA      Aaa       11,215       6.35% due 7/01/2018                                                  11,361
                 AAA      Aaa       19,000       6.45% due 7/01/2028                                                  19,246

Washington--                                  Seattle, Washington, Metropolitan Seattle Municipality,
2.7%                                          Sewer Revenue Bonds, Series W (e):
                 AAA      Aaa        2,465       6.25% due 1/01/2022                                                   2,489
                 AAA      Aaa        4,485       6.25% due 1/01/2023                                                   4,529
                 AAA      Aaa       33,535    Seattle, Washington, Municipal Light and Power Revenue Bonds,
                                              6.625% due 7/01/2020 (h)                                                35,744
                 AAA      Aaa       10,000    Seattle, Washington, Solid Waste Utility, Revenue Refunding
                                              Bonds, Series A, 6.875% due 5/01/2009 (g)                               10,672
                                              University of Washington, University Revenue Bonds (Housing
                                              and Dining)(e):
                 AAA      Aaa        2,600       7% due 12/01/2001 (a)                                                 2,909
                 AAA      Aaa          650       7% due 12/01/2021                                                       708
                 AAA      Aaa        7,000    Washington State, Health Care Facilities Authority Revenue
                                              Bonds (Southwest Washington Hospital--Vancouver), 7.125%
                                              due 10/01/2019 (g)                                                       7,565

West Virginia    AAA      Aaa       29,250    Marshall County, West Virginia, PCR, Refunding (Ohio
- --2.6%                                        Power Company--Kammer Plant Project), Series B, 5.45% due
                                              7/01/2014 (e)                                                           28,337
                 AAA      Aaa       11,465    Mason County, West Virginia, PCR, Refunding (Appalachian
                                              Power Co.), Series I, 6.85% due 6/01/2022 (e)                           12,284
                                              Pleasants County, West Virginia, PCR, Series 95-C (b):
                 AAA      Aaa        4,500       (Monogahela Power Co.), 6.15% due 5/01/2015                           4,581
                 AAA      Aaa       12,250       (Potomac Pleasants), 6.15% due 5/01/2015                             12,472
                 AAA      Aaa        1,000    Putnam County, West Virginia, PCR, Refunding (Appalachian
                                              Power Company Project), Series D, 5.45% due 6/01/2019 (b)                  941
                 AAA      Aaa        3,900    West Virginia State, Hospital Finance Authority Revenue
                                              Bonds (VH Mid-Atlantic/Capital), VRDN, Series G, 3.35%
                                              due 12/01/2025 (f)                                                       3,900

Wisconsin--3.2%  AAA      Aaa        7,000    Superior, Wisconsin, Limited Obligation Revenue Refunding
                                              Bonds (Midwest Energy Resources), Series E, 6.90% due 8/01/2021 (h)      7,990
                                              Wisconsin Public Power System Incorporated, Power Supply
                                              System Revenue Bonds, Series A (b):
                 AAA      Aaa        2,000       7.40% due 7/01/2000 (a)                                               2,227
                 AAA      Aaa        6,500       6.875% due 7/01/2001 (a)                                              7,206
                 AAA      Aaa        8,360       Refunding, 5.25% due 7/01/2021                                        7,464
                                              Wisconsin State Health and Educational Facilities Authority
                                              Revenue Bonds: 
                 AAA      Aaa       17,490       (Aurora Medical Group, Inc.), 5.75% due 11/15/2025 (i)               16,726
                 AAA      Aaa        1,500       (Saint Luke's Medical Center Project), 7.10% due 8/15/2019 (e)        1,634
                 AAA      Aaa        5,655       (Waukesha Memorial), Series B, 7.25% due 8/15/2000 (a)                6,281
                                              Wisconsin State Veterans Housing Loans, AMT, Series B (e):
                 AAA      Aaa        7,920       6.50% due 5/01/2020                                                   8,193
                 AAA      Aaa       17,130       6.50% due 5/01/2025                                                  17,757

                 Total Investments (Cost--$2,271,078)--100.5%                                                      2,378,216

                 Liabilities in Excess of Other Assets--(0.5%)                                                       (11,583)
                                                                                                                  ----------
                 Net Assets--100.0%                                                                               $2,366,633
                                                                                                                  ==========

              <FN>
              (a)Prerefunded.
              (b)AMBAC Insured.
              (c)Escrowed to maturity.
              (d)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 June 30, 1996.
              (e)MBIA Insured.
              (f)The interest rate is subject to change periodically based upon
                 prevailing market rates. The interest rate shown is the rate in
                 effect at June 30, 1996.
              (g)BIG Insured.
              (h)FGIC Insured.
              (i)FSA Insured.
              (j)GNMA Collateralized.
               ++Highest short-term rating issued by Moody's Investors Service, Inc.

              Rating of issues shown have not been audited by Deloitte & Touche LLP.


              See Notes to Financial Statements.
</TABLE>



                                      53
<PAGE>
 
<TABLE>
SCHEDULE OF INVESTMENTS                                                                                     (in Thousands)
<CAPTION>
                 Municipal Bonds                                                                          National Portfolio

                 S&P      Moody's    Face                                                                             Value
STATE            Ratings  Ratings   Amount    Issue                                                                 (Note 1a)
<C>              <C>      <C>      <C>        <S>                                                                 <C>
Alabama--0.4%    AAA      Aaa      $ 5,000    Alabama Agricultural and Mechanical University
                                              Revenue Bonds, 6.50% due 11/01/2025 (f)                             $    5,275

Alaska--2.5%                                  Valdez, Alaska, Marine Terminal Revenue Refunding Bonds:
                 AA-      Aa3        6,000       (British Petroleum Pipeline), Series B, 7% due 12/01/2025             6,500
                 AA-      Aa3       27,150       (Sohio Pipeline), 7.125% due 12/01/2025                              29,722

California--     NR*      NR*        6,000    Antioch, California, Improvement Bond Act of 1915 (Assessment
4.2%                                          District No. 27--Lone Tree), Series E, 7.125% due 9/02/2016              6,182
                 A-       A         10,350    California State Public Works Board, Lease Revenue Bonds
                                              (Department of Corrections--Monterey County, Soledad II),
                                              Series A, 7% due 11/01/2019                                             11,398
                 AAA      Aaa       11,850    East Bay, California, Municipal Utilities District,
                                              Water System Revenue Refunding Bonds, 5% due 6/01/2021 (f)              10,410
                 NR*      NR*        4,000    Long Beach, California, Special Tax Community Facilities
                                              (District No. 3--Pine Avenue), 6.375% due 9/01/2023                      3,734
                 AAA      Aaa       10,000    Los Angeles County, California, Metropolitan Transportation
                                              Authority, Sales Tax Revenue Refunding Bonds (Proposition A),
                                              Series A, 5% due 7/01/2021 (e)                                           8,772
                 AAA      Aaa       10,000    Los Angeles County, California, Sanitation Districts,
                                              Financing Authority Revenue Bonds (Capital Projects),
                                              Series A, 5.25% due 10/01/2019 (f)                                       9,112
                 A        NR*       10,725    Palmdale, California, Civic Authority, Revenue Refunding
                                              Bonds (Merged Redevelopment Project), Series A, 6.60% 
                                              due 9/01/2034                                                           11,290


Colorado--3.3%                                Denver, Colorado, City and County Airport Revenue Bonds, AMT:
                 BBB      Baa        3,000       Series A, 7.50% due 11/15/2023                                        3,300
                 BBB      Baa        8,570       Series A, 8% due 11/15/2025                                           9,578
                 BBB      Baa       13,000       Series B, 7.25% due 11/15/2023                                       13,716
                 BBB      Baa        5,650       Series C, 6.75% due 11/15/2022                                        5,769
                 BBB      Baa       13,150       Series D, 7.75% due 11/15/2021                                       14,487

Connecticut--   AA-      Baa1       4,550     Connecticut State Resource Recovery Authority, Resource
0.3%                                          Recovery Revenue Bonds (American Refunding Fuel), AMT, Series A,
                                              8% due 11/15/2015                                                        4,924

Delaware--0.6%   AAA      NR*        7,500    Delaware State Health Facilities Authority, Revenue Refunding
                                              Bonds (Beebe Medical Center Project), 8.50% due 6/01/2000 (j)            8,621

District of      A+       A1         3,750    District of Columbia Revenue Bonds (Georgetown University),
Columbia--0.3%                                RIB, 8.866% due 4/01/2022 (k)                                            4,013

Florida--3.5%    AAA      Aaa       10,000    Dade County, Florida, Special Obligation, Refunding Capital
                                              Appreciation Bonds, Series B, 6.50% due 10/01/2030 (c)(n)                1,140
                 AAA      Aaa        6,330    Florida, HFA (Antigua Club Apartments), AMT, Series A-1,
                                              7% due 2/01/2035 (c)                                                     6,673
                 NR*      Aaa        8,860    Florida, HFA, Home Ownership Revenue Bonds, AMT, Series
                                              G-1, 7.90% due 3/01/2022 (m)                                             9,358
                 AA       Aa3        5,000    Hillsborough County, Florida, IDA, PCR, Refunding (Tampa
                                              Electric Company Project), Series 91, 7.875% due 8/01/2021               5,758
                 AAA      NR*        2,700    Leesburg, Florida, Hospital Revenue Capital Improvement
                                              Bonds (Leesburg Regional Medical Center Project), Series
                                              91-A, 7.50% due 7/01/2002 (j)                                            3,122
                 AAA      NR*        4,765    Orange County, Florida, HFA, Mortgage Revenue Bonds, AMT,
                                              Series A, 8.375% due 3/01/2021 (m)                                       5,078
                 A1       VMIG1++    1,300    Pinellas County, Florida, Health Facilities Authority, Revenue
                                              Refunding Bonds (Pooled Hospital Loan Program), DATES, 3.70% due
                                              12/01/2015 (a)                                                           1,300
                                              South Broward, Florida, Hospital District:
                 AAA      Aaa       11,500       Refunding, 5.25% due 5/01/2021 (f)                                   10,517
                 AAA      Aaa        5,850       RIB, Series C, 9.237% due 5/01/2001 (c)(j)(k)                         6,910

Georgia--3.5%    AAA      Aaa       25,000    Atlanta, Georgia, Water and Sewer Revenue Refunding Bonds,
                                              4.75% due 1/01/2023 (e)                                                 20,994
                                              Metropolitan Atlanta, Georgia, Rapid Transit Authority,
                                              Sales Tax Revenue Bonds:
</TABLE> 



                                      54
<PAGE>
 
<TABLE> 
 <C>            <C>     <C>        <C>       <S>                                                                <C>       
                 AAA      Aaa       20,000       Second Indenture, Series A, 6.90% due 7/01/2020 (f)                  21,808
                 AA-      A1         7,500       Series O, 6.55% due 7/01/2020                                         7,873

Idaho--0.1%      AA       NR*        1,970    Idaho Housing Agency, S/F Mortgage, AMT, Series E, 7.875%
                                              due 7/01/2024 (b)                                                        2,077

Illinois--5.3%   AA-      Aa3        8,000    Chicago, Illinois, Gas Supply Revenue Bonds (Peoples Gas,
                                              Light & Coke Company Project), AMT, Series A, 8.10% due 5/01/2020        8,840
                                              Chicago, Illinois, O'Hare International Airport, Special
                                              Facilities Revenue Bonds (United Airlines, Inc.):
                 BB       Baa2       4,760       AMT, Series B, 8.95% due 5/01/2018                                    5,340
                 BB       Baa2      13,835       Series 84-B, 8.85% due 5/01/2018                                     15,555
                 AAA      Aaa        5,015    Chicago, Illinois, Public Building Commission, Building
                                              Revenue Bonds (Community College District No. 508),
                                              Series B, 8.75% due 1/01/2007 (d)(i)                                     5,325
                 A+       Aa         5,250    Illinois, HDA, Residential Mortgage Revenue Bonds, RIB, AMT,
                                              Series C-2, 9.562% due 2/01/2018 (k)                                     5,427
                                              Illinois Health Facilities Authority Revenue Bonds:
                 AAA      Aaa        1,500       (Methodist Health Project), RIB, 9.618% due 5/01/2021 (c)(k)          1,667
                 BBB      NR*        2,625       Refunding (Saint Elizabeth's Hospital--Chicago), 7.75%
                                                 due 7/01/2016                                                         2,822
                 AAA      Aaa       11,000       (Rush Presbyterian--Saint Luke's Medical Center), INFLOS,
                                                 9.494% due 10/01/2024 (f)(k)                                         12,155
                 AAA      Aaa        8,500    Illinois State, GO, Refunding, UT, 5.25% due 12/01/2020 (e)              7,698
                 AAA      Aaa        5,950    Regional Transportation Authority, Illinois, UT, Series D,
                                              6.75% due 6/01/2025 (e)                                                  6,688
                 NR*      A1         4,400    Southwestern Illinois Development Authority, Sewer Facilities
                                              Revenue Bonds (Monsanto Company Project), AMT, 7.30% due 7/15/2015       4,729

Indiana--2.9%    NR*      Aaa        9,500    Indiana State Educational Facilities Authority Revenue Bonds
                                              (University of Notre Dame Project), 6.70% due 3/01/2025                 10,355
                 BBB      Baa2       2,900    Indianapolis, Indiana, Airport Facility Revenue Refunding Bonds
                                              (Federal Express Corporation Project), 6.80% due 4/01/2017               3,012
                                              Indianapolis, Indiana, Local Public Improvement Bond Bank:
                 A+       NR*        9,100       Refunding, Series D, 6.75% due 2/01/2020                              9,801
                 NR*      Aaa       11,160       Series C, 6.70% due 1/01/2002 (j)                                    12,302
                 AA-      Aa2        5,950    Petersburg, Indiana, PCR, Refunding (Indianapolis Power & Light
                                              Company Project), 6.625% due 12/01/2024                                  6,269

Iowa--0.7%       NR*      NR*        9,000    Iowa Finance Authority, Health Care Facilities Revenue Refunding
                                              Bonds (Care Initiatives Project), 9.25% due 7/01/2025                   10,107

Kansas--1.6%     AAA      Aaa       10,000    Kansas City, Kansas, Utility System Revenue Refunding and
                                              Improvement Bonds, 6.375% due 9/01/2023 (e)                             10,436
                 AAA      Aaa       12,000    Wichita, Kansas, Hospital Revenue Bonds, RIB, Series III-A,
                                              8.956% due 10/01/2017 (f)(k)                                            12,885

Kentucky--1.4%   NR*      VMIG1++    9,000    Perry County, Kentucky, Healthcare System Revenue Bonds
                                              (Appalachian Regional Hospital), VRDN, 3.55% due 8/01/2014 (a)           9,000
                 NR*      NR*        4,500    Perry County, Kentucky, Solid Waste Disposal Revenue Bonds
                                              (TJ International Project), AMT, 7% due 6/01/2024                        4,571
                 AA       Aa2        6,345    Trimble County, Kentucky, PCR (Louisville Gas and Electric
                                              Company), AMT, Series A, 7.625% due 11/01/2020                           6,945

Louisiana--3.2%  NR*      Baa2      37,850    Lake Charles, Louisiana, Harbor and Terminal District Port
                                              Facilities, Revenue Refunding Bonds (Trunkline LNG Company
                                              Project), 7.75% due 8/15/2022                                           42,158
                 BB-      NR*        3,000    Port New Orleans, Louisiana, IDR, Refunding (Continental
                                              Grain Company Project), 7.50% due 7/01/2013                              3,106
                 BBB      Baa2       1,100    Saint Charles Parish, Louisiana, PCR (Union Carbide Project),
                                              AMT, 7.35% due 11/01/2022                                                1,147

Maine--0.3%      AA-      A1         3,815    Maine State Housing Authority, Mortgage Purchase, AMT,
                                              Series B-4, 6.90% due 11/15/2026                                         3,927

Maryland--0.5%   AA-      Aa         7,000    Maryland State Stadium Authority, Sports Facilities Lease
                                              Revenue Bonds, AMT, Series D, 7.60% due 12/15/2019                       7,667
</TABLE>



                                      55
<PAGE>
 
<TABLE>
SCHEDULE OF INVESTMENTS (continued)                                                                         (in Thousands) 
<CAPTION>
                 Municipal Bonds                                                                          National Portfolio

                 S&P      Moody's    Face                                                                             Value
STATE            Ratings  Ratings   Amount    Issue                                                                 (Note 1a)
<C>              <C>      <C>      <C>        <S>                                                                 <C>
Massachusetts    AAA      Aaa      $ 6,000    Massachusetts Bay Transportation Authority, Series B,
- --5.0%                                        7.875% due 3/01/2001 (j)                                            $    6,893
                                              Massachusetts State, Health and Educational Facilities
                                              Authority Revenue Bonds:
                 NR*      NR*        2,000       (Endicott College), VRDN, Series A, 3.40% due
                                                 10/01/2011 (a)                                                        2,000
                 NR*      NR*        9,320       (North Adams Regional Hospital), Series A, 9.625%
                                                 due 7/01/1999 (j)                                                    10,791
                 NR*      B         12,350       Refunding (New England Memorial Hospital), Series B,
                                                 6.25% due 7/01/2023                                                   9,478
                                              Massachusetts State, HFA (Residential Development),
                                              Series C (l): 
                 AAA      Aaa        5,000       6.875% due 11/15/2011                                                 5,255
                 AAA      Aaa        7,500       6.90% due 11/15/2021                                                  7,823
                 NR*      VMIG1++    1,000    Massachusetts State Industrial Finance Agency, PCR, Refunding
                                              (North East Power Company), VRDN, 3.35% due 10/01/2022 (a)               1,000
                 NR*      NR*        2,018    Massachusetts State, Industrial Finance Agency Revenue Bonds
                                              (Lower Mills Association II L.P.), VRDN, 3.40% due 12/01/2020 (a)        2,018
                 AAA      Aaa       30,000    Massachusetts State Water Resource Authority, Series B, 5%
                                              due 12/01/2025 (f)                                                      26,325

Michigan--3.5%   AAA      Aaa        9,250    Detroit, Michigan, Sewage Disposal Revenue Bonds
                                              (Water Supply System), Series A, 5% due 7/01/2025 (f)                    8,054
                 AAA      Aaa        2,000    Detroit, Michigan, Water Supply Systems, Revenue Refunding
                                              Bonds, 5% due 7/01/2023 (e)                                              1,751
                                              Michigan State Hospital Finance Authority, Hospital
                                              Revenue Bonds (Detroit Medical Center), Series A:
                 A        A          3,500       7.50% due 8/15/2011                                                   3,806
                 A        A          6,500       Refunding (Obligation Group), 6.50% due 8/15/2018                     6,616
                 AAA      Aaa       15,000    Michigan State Hospital Finance Authority (Sisters of
                                              Mercy), INFLOS, 8.676% due 2/15/2022 (h)(k)                             15,300
                 BBB      Baa1       9,350    Monroe County, Michigan, PCR (Detroit Edison Company Project),
                                              AMT, Series A, 7.75% due 12/01/2019                                     10,106
                 AA       Aa         5,000    Royal Oak, Michigan, Hospital Finance Authority Revenue
                                              Bonds (William Beaumont Hospital), Series D, 6.75% due 1/01/2020         5,254

Minnesota--                                   Minnesota State, HFA, S/F Mortgage:
1.4%             AA+      Aa         6,090       AMT, Series A, 7.45% due 7/01/2022 (b)                                6,350
                 AA+      Aa         4,250       Series F, 6.30% due 7/01/2025                                         4,283
                 AAA      NR*        8,555    Saint Paul, Minnesota, Housing and Redevelopment Authority,
                                              S/F Mortgage Revenue Refunding Bonds, Series C, 6.95%
                                              due 12/01/2031 (l)                                                       8,833

Mississippi--    BBB      Baa        5,950    Lowndes County, Mississippi, Hospital Revenue Refunding
0.7%                                          Bonds (Golden Triangle Medical Center), 8.50% due 2/01/2010              6,420
                 NR*      Aaa        4,195    Mississippi Home Corporation, S/F Mortgage Revenue Bonds
                                              (Access Program), AMT, Final Tranche, Series A, 6.90% due
                                              6/01/2024 (m)                                                            4,350

Missouri &       BBB+     NR*       11,400    Bi-State Development Agency, Missouri and Illinois,
Illinois--0.9%                                Metropolitan No. 5, Refunding (American Commercial Lines,
                                              Inc.), 7.75% due 6/01/2010                                              12,482

Nebraska--0.9%                                Nebraska Investment Finance Authority, S/F Mortgage Revenue
                                              Bonds, AMT, Series 2 (m):
                 AAA      Aaa          100       7.631% due 9/10/2030                                                    106
                 AAA      Aaa        4,100       RIB, 11.278% due 9/10/2030 (k)                                        4,556
                 A+       A1        10,000    Nebraska Public Power District, Revenue Refunding Bonds
                                              (Power Supply System), Series C, 5% due 1/01/2017                        8,829

Nevada--0.3%     AAA      Aaa        3,500    Washoe County, Nevada, Gas and Water Facilities Revenue
                                              Refunding Bonds (Sierra Pacific), 6.30% due 12/01/2014 (c)               3,706

New Hampshire--  A+       Aa         2,910    New Hampshire State, HFA, S/F Residential Mortgage, AMT,
0.2%                                          7.90% due 7/01/2022                                                      3,066

New Jersey--%    AA-      Aa        10,000    New Jersey Building Authority, State Building Revenue
1.9                                           Refunding Bonds, 5% due 6/15/2018                                        8,866
                 NR*      NR*        6,595    New Jersey Health Care Facilities Financing Authority Revenue
                                              Bonds (Riverwood Center), Series A, 9.90% due 7/01/2021                  7,346
</TABLE> 



                                      56
<PAGE>
 
<TABLE> 
 <C>            <C>     <C>       <C>       <S>                                                                     <C>   
                 AA       A          9,500    University of Medicine and Dentistry of New Jersey, Series C,
                                              7.20% due 12/01/1999 (j)                                                10,424

New York--12.5%                               Metropolitan Transportation Authority, New York, Service
                                              Contract Refunding Bonds (Commuter Facilities), Series 5:
                 BBB      Baa1       2,145       6.90% due 7/01/2006                                                   2,309
                 BBB      Baa1       5,000       7% due 7/01/2012                                                      5,348
                                              New York City, New York, GO, UT:
                 AAA      Aaa        4,570       Series A, 7.75% due 8/15/2001 (j)                                     5,248
                 BBB+     Baa1       1,685       Series A, 7.75% due 8/15/2016                                         1,879
                 BBB+     Baa1       1,410       Series A, 7.75% due 8/15/2017                                         1,570
                 BBB+     Baa1       5,375       Series B, 8.25% due 6/01/2006                                         6,407
                 BBB+     Baa1       2,700       Series B, 8.25% due 6/01/2007                                         3,201
                 BBB+     Baa1      10,000       Series B, Fiscal 92, 7.75% due 2/01/2011                             11,063
                 BBB+     Baa1       4,500       Series B, Fiscal 92, 7.75% due 2/01/2012                              4,979
                 BBB+     Baa1       2,875       Series B, Fiscal 92, 7.75% due 2/01/2013                              3,181
                 BBB+     Baa1       1,650       Series B, Fiscal 92, 7.75% due 2/01/2014                              1,825
                 AAA      Aaa        1,865       Series D, 7.70% due 2/01/2002 (j)                                     2,136
                 BBB+     AAA        3,495       Series D, Group C, 8% due 8/01/2001 (j)                               4,050
                 BBB+     Aaa        5,495       Series F, 8.25% due 11/15/2001 (j)                                    6,471
                 NR*      NR*        5,000    New York City, New York, IDA, Revenue Bonds (Visy Paer Inc.
                                              Project), AMT, 7.95% due 1/01/2028                                       5,152
                                              New York City, New York, Municipal Water Finance Authority,
                                              Water and Sewer System Revenue Bonds:
                 A-       A          1,290       Series A, 6.75% due 6/15/2017                                         1,353
                 AAA      Aaa       10,000       Series B, 5.375% due 6/15/2019 (c)                                    9,356
                                              New York State Dormitory Authority Revenue Bonds (State
                                              University Educational Facilities):
                 BBB+     Baa1       6,735       Refunding, Series B, 7.375% due 5/15/2014                             7,324
                 BBB+     Baa1       2,000       Refunding, Series B, 7% due 5/15/2016                                 2,114
                 BBB+     Baa1       6,500       Series A, 7.50% due 5/15/2013                                         7,586
                 A        Aa        21,500    New York State Environmental Facilities Corporation,
                                              PCR (State Water Revolving Fund), Series E, 6.50% due 6/15/2014         22,778
                                              New York State Local Government Assistance Corporation:
                 A        A          6,000       Series A, 7% due 4/01/2012                                            6,642
                 A        A         10,000       Series C, 6.25% due 4/01/2018                                        10,164
                                              New York State Medical Care Facilities, Finance Agency Revenue
                                              Bonds (New York Hospital Mortgage), Series A (b)(c):
                 AAA      Aaa        8,400       6.75% due 8/15/2014                                                   9,040
                 AAA      Aaa        9,100       6.80% due 8/15/2024                                                   9,829
                 AA-      Aa         5,000    New York State Power Authority, Revenue and General Purpose
                                              Refunding Bonds, Series Z, 6.50% due 1/01/2019                           5,270
                                              New York State Urban Development Corporation Revenue Bonds
                                              (Correctional Capital Facilities):
                 BBB      Baa1       4,000       Series 4, 5.375% due 1/01/2023                                        3,535
                 BBB      Baa1      21,615       Series 6, 5.375% due 1/01/2025                                       19,034
                 A+       Aa         1,000    Triborough Bridge and Tunnel Authority, New York, General
                                              Purpose Revenue Bonds, Series X, 6.50% due 1/01/2019                     1,055

North Carolina   A1+      NR*        1,300    Raleigh-Durham, North Carolina, Airport Authority, Special
- --0.1%                                        Facilities Revenue Refunding Bonds (American Airlines), VRDN,
                                              Series A, 3.60% due 11/01/2005 (a)                                       1,300

Ohio--3.0%       NR*      NR*        4,000    Ashtabula County, Ohio, Hospital Facilities Revenue Bonds
                                              (Ashtabula County Medical Center Project), VRDN, 3.40% due
                                              12/01/2007 (a)                                                           4,000
                 AAA      Aaa       12,000    Cleveland, Ohio, Public Power System Revenue Bonds, First
                                              Mortgage, Series A, 7% due 11/15/2024 (f)                               13,253
                                              Cuyahoga County, Ohio, Hospital Revenue Improvement Bonds:
                 AAA      Aaa        6,640       Refunding (University Hospitals Health System Project),
                                                 Series B, 5.50% due 1/15/2018 (f)                                     6,357
                 NR*      VMIG1++      500       (University Hospital of Cleveland), VRDN, 3.70% due
                                                 1/01/2016 (a)                                                           500
                                              Ohio HFA, S/F Mortgage Revenue Bonds, AMT (m):
                 AAA      Aaa        9,850       RIB, Series B-4, 9.72% due 3/31/2031 (k)                             10,281
                 AAA      NR*        2,225       Series B, 8.25% due 12/15/2019                                        2,353
                 AAA      NR*        4,295       Series C, 7.85% due 9/01/2021                                         4,523
                 BB       Ba2        1,300    Ohio State Air Quality Development Authority, Revenue
                                              Refunding Bonds (Cleveland Electric Illuminating Company),
                                              7.70% due 8/01/2025                                                      1,317
</TABLE>




                                      57
<PAGE>
 
<TABLE>
SCHEDULE OF INVESTMENTS (concluded)                                                                         (in Thousands)
<CAPTION>
                 Municipal Bonds                                                                          National Portfolio

                 S&P      Moody's    Face                                                                             Value
STATE            Ratings  Ratings   Amount    Issue                                                                 (Note 1a)
<C>              <C>      <C>      <C>        <S>                                                                 <C>
Pennsylvania     BB       Ba2      $ 6,800    Beaver County, Pennsylvania, IDA, PCR, Refunding
- --4.5%                                        (Cleveland Electric Company Project), 7.625% due 5/01/2025          $    6,877
                 BBB-     Baa       12,500    Pennsylvania Convention Center Authority, Revenue Refunding
                                              Bonds, Series A, 6.75% due 9/01/2019                                    13,293
                                              Pennsylvania HFA, Refunding:
                 AAA      Aaa        7,850       (Rental Housing), 6.50% due 7/01/2023 (l)                             8,057
                 AA       Aa         8,800       RIB, AMT, Series 1991-31C, 9.884% due 10/01/2023 (k)                  9,273
                 AAA      Aaa       10,000    Pennsylvania State Higher Education Assistance Agency,
                                              Student Loan Revenue Bonds, RIB, AMT, 9.622% due 9/03/2026 (c)(k)       10,937
                 NR*      NR*        5,970    Pennsylvania State Higher Educational Facilities Authority,
                                              College and University Revenue Bonds (Eastern College),
                                              Series B, 8% due 10/15/2025                                              5,989
                 AAA      Aaa        2,350    Philadelphia, Pennsylvania, Gas Works Revenue Bonds,
                                              15th Series 3, 5.25% due 8/01/2024 (h)                                   2,142
                 AAA      Aaa        4,800    Pittsburgh, Pennsylvania, Water and Sewer Authority, Water
                                              and Sewer System Revenue Refunding Bonds, Series A, 6.75%
                                              due 9/01/2001 (e)(j)                                                     5,313
                 AAA      Aaa        2,500    York County, Pennsylvania, Hospital Authority Revenue
                                              Bonds (York Hospital), 7% due 1/01/2001 (c)(j)                           2,772

Rhode Island     AAA      Aaa        5,250    Rhode Island Depositors Economic Protection Corporation,
- --0.4%                                        Special Obligation Bonds, Series A, 6.95% due 8/01/2002 (j)              5,880

South Carolina-- BBB      Baa1       8,355    South Carolina Jobs, EDA, Economic Development Revenue
0.6%                                          Bonds (Saint Francis Hospital--Franciscan Sisters), 7%
                                              due 7/01/2015                                                            8,716

South Dakota--   AAA      Aa1        9,085    South Dakota, HDA, Homeownership Mortgage, Series A,
0.7%                                          7.15% due 5/01/2027                                                      9,498

Tennessee--0.7%  NR*      NR*       10,000    Knox County, Tennessee, Health, Educational and Housing
                                              Facilities Board, Hospital Facilities Revenue Bonds
                                              (Baptist Health System of East Tennessee), 8.60% due 4/15/2016          10,563

Texas--14.0%                                  Brazos River Authority, Texas, PCR (Texas Utilities
                                              Electric Company Project), AMT, Series A:
                 BBB+     Baa2       2,095       8.25% due 1/01/2019                                                   2,259
                 BBB+     Baa2      18,150       7.875% due 3/01/2021                                                 19,917
                 A        A2        12,350    Brazos River Authority, Texas, Revenue Refunding Bonds
                                              (Houston Light and Power), Series 1989-A, 7.625% due 5/01/2019          13,415
                 BBB      Baa1       7,250    Gulf Coast Waste Disposal Authority, Texas, Revenue Bonds
                                              (Champion International Corporation), AMT, 7.45% due 5/01/2026           7,738
                 AA       Aa        19,000    Harris County, Texas, Health Facilities Development
                                              Corporation, Health Care System Revenue Bonds (Sisters of
                                              Charity), 7.10% due 7/01/2021                                           20,567
                                              Harris County, Texas, Health Facilities Development
                                              Corporation, Hospital Revenue Bonds:
                 AAA      Aaa       20,000       (Hermann Hospital Project), 6.375% due 10/01/2024 (f)                20,674
                 AA       Aa        12,470       (Saint Luke's Episcopal Hospital Project), Series A,
                                                 6.75% due 2/15/2021                                                  13,148
                                              Harris County, Texas, Toll Road Revenue Bonds:
                 AAA      Aaa       10,000       Refunding, Senior Lien, 5.375% due 8/15/2020 (e)                      9,365
                 AAA      Aaa        8,000       Refunding, Senior Lien, 5.50% due 8/15/2021 (e)                       7,623
                 AAA      Aaa       11,100       Senior Lien, Series A, 6.375% due 8/15/2024 (f)                      11,497
                 AAA      Aaa       10,000    Houston, Texas, Water and Sewer System Revenue Refunding
                                              Bonds, Junior Lien, Series A, 6.20% due 12/01/2023 (f)                  10,207
                 BB       Ba1        8,095    Jefferson County, Texas, Health Facilities Development
                                              Corporation, Hospital Revenue Bonds (Baptist Healthcare
                                              Systems Project), 8.875% due 6/01/2021                                   8,480
                 AA       Aa        12,000    North Central Texas, Health Facilities Development Corporation
                                              Revenue Bonds (Baylor University Medical Center), INFLOS,
                                              Series A, 9.735% due 5/15/2001 (j)(k)                                   14,325
                 BB       Ba         6,500    Odessa, Texas, Junior College District, Revenue Refunding
                                              Bonds, Series A, 8.125% due 12/01/2018                                   6,880
                 A1       VMIG1++      100    Sabine River Authority, Texas, PCR, Refunding (Texas
                                              Utilities Project), VRDN, Series A, 3.65% due 3/01/2026 (a)(c)             100
</TABLE> 



                                      58
<PAGE>
 
<TABLE> 
<C>            <C>      <C>        <C>       <S>                                                                <C> 
                 AAA      Aaa       14,500    San Antonio, Texas, Hotel Occupancy Revenue Bonds
                                              (Henry B. Gonzalez Convention Center Project), 5.70% due
                                              8/15/2026 (e)                                                           14,152
                 NR*      VMIG1++      100    Southwest Texas, Higher Education Authority Incorporated,
                                              Crossover Revenue Refunding Bonds (Southern Methodist University),
                                              VRDN, 3.55% due 7/01/2015 (a)                                              100
                 A+       Aa         6,325    Texas Housing Agency, Residential Development Mortgage
                                              Revenue Bonds, Series A, 7.50% due 7/01/2015 (m)                         6,695
                 AAA      Aaa        4,900    Texas Municipal Power Agency Revenue Refunding Bonds, 6.17%
                                              due 9/01/2015 (f)(n)                                                     1,554
                 AAA      Aaa       10,000    Texas State Turnpike Authority, Dallas North Thruway Revenue
                                              Bonds (President George Bush Turnpike), 5% due 1/01/2025 (e)             8,790
                 AA       Aa         4,440    Texas State Veterans Housing Assistance (Fund II), AMT, UT,
                                              Series A, 7% due 12/01/2025                                              4,616

Utah--2.6%       AA-      Aa        26,500    Intermountain Power Agency, Utah, Power Supply Revenue
                                              Refunding Bonds, Series D, 5% due 7/01/2021                             22,873
                 AA       NR*       13,250    Weber County, Utah, Municipal Building Authority, Lease
                                              Revenue Bonds, 7.50% due 12/15/2019                                     14,780

Virginia--2.4%   AAA      Aaa       26,800    Prince William County, Virginia, Service Authority, Water
                                              and Sewer System, Revenue Refunding Bonds, 5% due 7/01/2021 (e)         23,635
                 AAA      Aaa        8,000    Upper Occoquan Sewage Authority, Virginia, Regional Sewage
                                              Revenue Bonds, Series A, 5.15% due 7/01/2020 (f)                         7,321
                 AA+      Aa1        4,000    Virginia State HDA, Commonwealth Mortgage, Series A, 7.15%
                                              due 1/01/2033                                                            4,208

Washington--3.2% AAA      NR*       18,070    Washington State Housing Finance Commission, S/F Mortgage
                                              Revenue Refunding Bonds, AMT, Series E, 7.10% due 7/01/2022 (g)         18,686
                                              Washington State Public Power Supply System, Revenue Refunding
                                              Bonds (Nuclear Project No. 1), Series A:
                 AA-      Aa        15,500       6.50% due 7/01/2015                                                  15,810
                 AA-      Aa        11,000       6.875% due 7/01/2017                                                 11,525

West Virginia    NR*      NR*        4,000    Upshur County, West Virginia, Solid Waste Disposal
- --1.0%                                        Revenue Bonds (TJ International Project), AMT,
                                              7% due 7/15/2025                                                         4,068
                 A1+      Aaa        1,500    West Virginia State, Hospital Finance Authority, Hospital
                                              Revenue Bonds (VHA Mid-Atlantic/Capital), VRDN, Series G,
                                              3.35% due 12/01/2025 (a)(c)                                              1,500
                 AA+      Aa1        8,400    West Virginia State, Housing Development Fund, Housing Finance,
                                              Series D, 7.05% due 11/01/2024                                           8,805

Wisconsin--2.4%  AA       Aa         4,925    Wisconsin Housing and EDA Home Ownership Revenue Bonds,
                                              Series A, 7.10% due 3/01/2023                                            5,170
                                              Wisconsin Housing and EDA Housing Revenue Bonds:
                 A        A1         5,400       Series B, 7.05% due 11/01/2022                                        5,663
                 A        A1         5,105       Series C, 7% due 5/01/2015                                            5,347
                                              Wisconsin State Health and Educational Facilities Authority
                                              Revenue Bonds, Series B:
                 AAA      Aaa        5,500       (Novus Health Group), 6.75% due 12/15/2020 (f)                        5,803
                 AAA      Aaa       11,400       (Wausau Hospitals Inc.), 6.70% due 8/15/2020 (c)                     11,938


                 Total Investments (Cost--$1,331,510)--97.5%                                                       1,403,759

                 Other Assets Less Liabilities--2.5%                                                                  36,307
                                                                                                                  ----------
                 Net Assets--100.0%                                                                               $1,440,066
                                                                                                                  ==========

              <FN>
              (a)The interest rate is subject to change periodically based upon
                 prevailing market rates. The interest rate shown is the rate in effect
                 at June 30, 1996.
              (b)FHA Insured.
              (c)AMBAC Insured.
              (d)BIG Insured.
              (e)FGIC Insured.
              (f)MBIA Insured.
              (g)GNMA/FNMA Collateralized.
              (h)FSA Insured.
              (i)Escrowed to Maturity.
              (j)Prerefunded.
              (k)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 June 30, 1996.
              (l)FNMA Collateralized.
              (m)GNMA Collateralized.
              (n)Represents a zero coupon bond; the interest rate shown is the
                 effective yield at the time of purchase by the Portfolio.
                *Not Rated.
               ++Highest short-term rating issued by Moody's Investors Service, Inc.

              Ratings of issues shown have not been audited by Deloitte & Touche LLP.

              See Notes to Financial Statements.
</TABLE>




                                      59
<PAGE>
 
<TABLE>
SCHEDULE OF INVESTMENTS                                                                                     (in Thousands)
<CAPTION>
                 Municipal Bonds                                                                 Limited Maturity Portfolio

                 S&P      Moody's    Face                                                                             Value
STATE            Ratings  Ratings   Amount    Issue                                                                 (Note 1a)
<C>              <C>      <C>      <C>        <S>                                                                 <C>
Arizona--0.5%    A1+      P1       $ 2,500    Maricopa County, Arizona, Pollution Control Corporation,
                                              PCR, Refunding (Arizona Public Service Co.), VRDN, Series C,
                                              3.60% due 5/01/2029 (b)                                             $    2,500

Arkansas--0.8%   NR*      Aa         4,000    Arkansas State Student Loan Authority Revenue Bonds, AMT,
                                              Senior Series A-1, 5.50% due 12/01/1998                                  4,083

Colorado--0.8%   AA       Baa1       3,810    Jefferson County, Colorado, School District No. R-001,
                                              Refunding, Series A, 3.65% due 12/15/1996                                3,808

Connecticut--    AAA      Aaa        2,160    Bridgeport, Connecticut, Refunding, GO, UT, Series A,
1.8%                                          4.40% due 9/01/1998 (c)                                                  2,161
                 NR*      Aa3        3,890    Connecticut State Housing Mortgage Revenue Bonds
                                              (Chestnut Hill Apartments), 4.60% due 4/01/1997                          3,881
                 NR*      NR*        3,250    Waterbury, Connecticut, BAN, 4.65% due 2/19/1997                         3,258

Florida--1.1%    AA       Aa1        5,000    Jacksonville, Florida, Electric Authority Revenue Bonds
                                              (Electric Systems), Series 3-B, 4% due 10/01/1998                        4,971
                 A1+      VMIG1++      600    Saint Lucie County, Florida, PCR, Refunding (Florida Power
                                              and Light Company Project), VRDN, 3.70% due 1/01/2026 (b)                  600

Georgia--7.0%                                 Burke County, Georgia, Development Authority, PCR (Plant
                                              Vogtle Project):
                 A1       VMIG1++    1,500       (Georgia Power Company), VRDN, 2nd Series, 3.70% due
                                                 4/01/2025 (b)                                                         1,500
                 A+       NR*        6,410       Refunding (Oglethorpe Power Company), Series B, 3.95%
                                                 due 1/01/1999                                                         6,291
                                              Georgia State, GO:
                 AA+      Aaa        5,000       Series C, 6.50% due 7/01/1999                                         5,291
                 AA+      Aaa        9,650       UT, Series B, 7.20% due 3/01/1999                                    10,326
                 AA+      Aaa        7,500       UT, Series D, 7% due 11/01/1999                                       8,087
                 AA       Aa1        4,000    Gwinnett County, Georgia, School District, Refunding, GO,
                                              UT, 4.40% due 2/01/1998                                                  4,015

Illinois--11.5%  AA-      NR*       10,000    Chicago, Illinois, Board of Education, COP (School Reform
                                              Equipment Acquisition), 4.60% due 12/01/1999                             9,925
                 AAA      Aaa        4,120    Chicago, Illinois, Public Commerce Building Revenue Bonds
                                              (Chicago Board of Education), Series A, 7.75% due 1/01/1999 (a)(f)       4,515
                                              Chicago, Illinois, School Financing Authority:
                 AA-      Baa1       5,000       7.25% due 6/01/1998                                                   5,142
                 AAA      Aaa        4,500       Refunding, Series A, 5.80% due 6/01/1999 (f)                          4,646
                 AAA      Aaa        3,000    Cook County, Illinois, High School District No. 205,
                                              Refunding (Thorton Township), UT, 5.60% due 6/01/1998 (f)(g)             3,078
                 AA       Aa1       11,425    Cook County, Illinois, Township High School District No. 211
                                              (Palatine & Schaumb), 4.25% due 12/01/1998                              11,414
                 NR*      VMIG1++    1,000    Illinois Health Facilities Authority Revenue Bonds (Resurrection
                                              Health Care System), VRDN, 3.85% due 5/01/2011 (b)                       1,000
                                              Illinois State, Refunding, GO, UT:
                 AA-      A1         4,600       3.90% due 12/01/1998                                                  4,537
                 AAA      Aaa        3,500       5.125% due 12/01/1999 (f)                                             3,563
                 A        A1        10,000    Illinois State Toll Highway Authority, Toll Highway Priority,
                                              Revenue Refunding Bonds, Series A, 4.10% due 1/01/1998                   9,961

Kentucky--2.6%   A+       A         13,000    Kentucky State Property and Buildings Commission, Revenue
                                              Refunding Bonds (Project No. 55), 3.60% due 9/01/1996                   12,997

Louisiana--4.6%                               Louisiana Public Facilities Authority Revenue Bonds (Tulane
                                              University), Series B:
                 A        A1         3,140       6.80% due 8/15/1996                                                   3,152
                 A        A1           470       6.80% due 8/15/1996 (g)                                                 472
                 AAA      Aaa       19,230    Louisiana State, GO, Refunding, Series A, 5.50% due 8/01/1998 (f)       19,698

Massachusetts--  BBB+     NR*          543    Massachusetts State, COP, GO, 5.10% due 7/01/1996                          543
5.4%             A+       A1         5,000    Massachusetts State, GO, Refunding, Series A, 5.50% due 7/01/1999        5,129
</TABLE> 



                                      60
<PAGE>
 
<TABLE> 
<C>             <C>     <C>        <C>       <S>                                                                   <C> 
                 AAA      Aaa        2,005    Massachusetts State Health and Educational Facilities
                                              Authority Revenue Bonds (New England Medical Center Hospitals),
                                              Series G, 3.80% due 7/01/1997 (d)                                        2,005
                 NR*      NR*        3,465    Massachusetts State, Industrial Finance Agency, Industrial
                                              Revenue Refunding Bonds (New England Biolabs), VRDN, AMT, 3.50%
                                              due 3/01/2016 (b)                                                        3,465
                 SP1      VMIG1++    5,000    Massachusetts State Turnpike Authority, BAN, Series A, 5%
                                              due 6/01/1999                                                            5,074
                 A-       A1        10,160    New England Education Loan Marketing Corporation Refunding
                                              Bonds (Massachusetts Student Loan), Series D, 4.75% due 7/01/1998       10,220
                 NR*      NR*          995    South Hadley, Massachusetts, Industrial Revenue Bonds
                                              (South Hadley Health Care), AMT, Series A, 5% due 12/01/1996               993

Michigan--5.6%   AAA      Aaa       10,000    Detroit, Michigan, Distributable State Aid, 7.20% due
                                              5/01/1999 (a)(c)                                                         10,897
                                              Michigan State Building Authority, Revenue Refunding Bonds,
                                              Series I:
                 AA-      A         10,145       3.90% due 10/01/1997                                                 10,137
                 AA-      A1         6,000       5.80% due 10/01/1998                                                  6,186
                 NR*      VMIG1++      800    Michigan State Strategic Fund, Solid Waste Disposal
                                              Revenue Bonds (Grayling Generating Project), VRDN, AMT, 3.55%
                                              due 1/01/2014 (b)                                                          800

Minnesota--0.6%  AAA      Aaa        3,085    Minnesota State, HFA, Refunding (Rental Housing), Series D,
                                              4.50% due 8/01/1999 (d)                                                  3,084

Mississippi--    NR*      Aaa       10,000    Mississippi Higher Education Assistance Corporation, Student
2.0%                                          Loan Revenue Bonds, AMT, Series B, 4.80% due 9/01/1998                  10,063
                 NR*      P1           100    Perry County, Mississippi, PCR, Refunding (Leaf River Forest
                                              Project), VRDN, 3.60% due 3/01/2002 (b)                                    100

Nebraska--1.2%   A+       A1         6,250    Nebraska Public Power District Revenue Bonds, 4.90% due 7/01/1998        6,321

New Jersey--     A-       A1         2,000    Camden County, New Jersey, Improvement Authority, Solid Waste
1.6%                                          Disposal Revenue Refunding Bonds (Landfill Project), 4%
                                              due 7/01/1997                                                            2,003
                 AAA      Aaa        5,715    New Jersey State Educational Facilities Authority Revenue
                                              Bonds (Higher Educational Facilities Trust Fund), Series A,
                                              5.125% due 9/01/1999 (c)                                                 5,823

New Mexico--     A1+      P1         1,400    Farmington, New Mexico, PCR, Refunding (Arizona Public
0.3%                                          Service Co.), VRDN, Series B, 3.60% due 9/01/2024 (b)                    1,400

New York--6.1%   A+       Aa        10,000    Municipal Assistance Corporation, New York City, New York, GO,
                                              Refunding, Series E, 4.30% due 7/01/1999                                 9,933
                                              New York State Dormitory Authority Revenue Bonds (Consolidated
                                              City University System), Series A:
                 BBB      Baa1       6,675       4.50% due 7/01/1998                                                   6,684
                 BBB      Baa1      10,885       4.75% due 7/01/1999                                                  10,864
                 AAA      Aaa        3,000    New York State Dormitory Authority Revenue Bonds (State
                                              University Education), Series A, 7.125% due 5/15/1999 (a)                3,275

North Carolina   AAA      Aaa        6,500    North Carolina State, Public Improvement Refunding Bonds,
- --1.5%                                        3.70% due 8/01/1998                                                      6,456
                 A1+      NR*        1,100    Raleigh-Durham, North Carolina Airport Authority, Special
                                              Facility Revenue Refunding Bonds (American Airlines),
                                              VRDN, Series B, 3.60% due 11/01/2015 (b)                                 1,100

North Dakota     NR*      Aa         5,000    North Dakota Student Loan Revenue Refunding Bonds,
- --1.9%                                        Series A, 5.40% due 7/01/1996                                            5,001
                 A2       Baa2       4,500    Oliver County, North Dakota, PCR (Minnesota Power and Light,
                                              Square Butte Electric), Series B, 4.50% due 9/01/2007                    4,504
</TABLE>




                                      61
<PAGE>
 
<TABLE>
SCHEDULE OF INVESTMENTS (concluded)                                                                         (in Thousands)
<CAPTION>
                 Municipal Bonds                                                                 Limited Maturity Portfolio

                 S&P      Moody's    Face                                                                             Value
STATE            Ratings  Ratings   Amount    Issue                                                                 (Note 1a)
<C>              <C>      <C>      <C>        <S>                                                                  <C>
Ohio--9.9%       NR*      VMIG1++  $ 3,500    Miami Valley Regional Transport Authority, Ohio
                                              (Capital Facilities), BAN, 4.75% due 4/15/1997                       $   3,524
                                              Ohio State Air Quality Development Authority, Revenue
                                              Refunding Bonds (Ohio Edison Project), Series A:
                 A+       VMIG1++   10,500       4.25% due 8/01/1996                                                  10,505
                 A+       VMIG1++    7,500       3.95% due 2/01/2015                                                   7,484
                 NR*      Aaa        6,700    Ohio State Building Authority, Correctional Facilities,
                                              Series A, 7.35% due 8/01/1999 (a)                                        7,360
                                              Ohio State Public Facilities Commission, Higher Education
                                              Capital Facilities, Series II-A:
                 A+       A1         3,300       5.30% due 12/01/1996                                                  3,321
                 AAA      Aaa        3,500       4.375% due 11/01/1999 (d)                                             3,487
                 AAA      Aaa        8,000    Ohio State Public Facilities Commission, Refunding (Mental
                                              Health Facilities), Series II-B, 4.25% due 6/01/1998 (e)                 8,009
                 NR*      Aaa        6,000    Student Loan Funding Corporation, Cincinnati, Ohio, Student
                                              Loan Revenue Refunding Bonds, AMT, Series C, 5.70% due 7/01/1999         6,136

Oklahoma--0.5%   AA       Aa         2,400    Tulsa, Oklahoma, GO, UT, 5.125% due 5/01/1999                            2,440

Pennsylvania     A1+      P1         4,000    Beaver County, Pennsylvania, IDA, PCR, Refunding (Ohio
- --4.4%                                        Edison Company), Series A, 4.30% due 10/01/2032                          4,018
                 AAA      Aaa        8,675    Pennsylvania State, Refunding, GO, UT, 5.25% due 11/15/1998 (f)          8,871
                 A1+      VMIG1++    6,300    Philadelphia, Pennsylvania, Hospitals and Higher Education
                                              Facilities Authority, Hospital Revenue Bonds (Children's Hospital
                                              of Philadelphia Project), VRDN, 3.70% due 3/01/2027 (b)                  6,300
                 AAA      Aaa        3,000    Pittsburgh, Pennsylvania, Water and Sewer Authority, Water
                                              and Sewer System Revenue Refunding Bonds, Series A, 3.50%
                                              due 9/01/1996 (f)                                                        2,999

Rhode Island     NR*      A          6,000    Rhode Island State, Student Loan Authority, Student Loan
- --1.2%                                        Revenue Refunding Bonds, Series A, 5.70% due 12/01/1996                  6,031

South Carolina   AA-      Aa         4,000    South Carolina State Public Service Authority, Revenue Refunding
- --0.8%                                        Bonds (Electric Revenue and Electric Systems Expansion), Series A,
                                              7.50% due 7/01/1996                                                      4,001

Tennessee--2.2%  AA       NR*        6,885    Clarksville, Tennessee, Public Building Authority, Revenue
                                              Refunding Bonds (Pooled Loan Program), 4.40% due 12/01/1998              6,876
                 AA+      Aa         4,000    Shelby County, Tennessee, Refunding, Series A, 6.40%
                                              due 8/01/1996 (a)                                                        4,030

Texas--6.9%                                   Brazos, Texas, Higher Education Authority Incorporated,
                                              Student Loan Revenue Refunding Bonds, AMT:
                 NR*      Aaa        2,200       Senior Lien, Series A-2, 5.45% due 6/01/1998                          2,241
                 NR*      Aaa        5,000       Series C-1, 4.75% due 6/01/1997                                       5,036
                 NR*      Aa         5,215       Series C-1, 5.60% due 11/01/1997                                      5,308
                                              Fort Bend County, Texas, Industrial Development Corporation,
                                              Refunding (Frito Lay Inc. Project):
                 NR*      A1           950       IDR, 4% due 10/01/2011                                                  951
                 NR*      A1         3,650       PCR, 4% due 10/01/2011                                                3,652
                 A1+      NR*        6,100    Harris County, Texas, Health Facilities Development
                                              Corporation, Hospital Revenue Bonds (Methodist Hospital),
                                              VRDN, 3.70% due 12/01/2025 (b)                                           6,100
                 AA-      Aa         4,520    Houston, Texas, GO, Refunding, Series C, 5.50% due 4/01/1999             4,633
                                              Panhandle-Plains, Texas, Higher Education Authority
                                              Incorporated, Student Loan Revenue Refunding Bonds, Series C:
                 NR*      Aaa        2,000       3.95% due 9/01/1996                                                   2,001
                 NR*      Aaa        2,675       4.15% due 9/01/1997                                                   2,679
                 A+       A1         2,000    Texas Municipal Power Agency, Revenue Refunding Bonds,
                                              Series A, 4.25% due 9/01/1997                                            2,006

Utah--9.8%       NR*      NR*       26,518    Carbon County, Utah, Solid Waste Disposal Revenue Refunding
                                              Bonds (East Carbon Landfill Project), AMT, 6.04% due 5/01/1997          26,783
                 AA       Aa         1,250    Intermountain Power Agency, Utah, Power Supply Revenue
                                              Refunding Bonds, Series A, 3.90% due 7/01/1996                           1,250
</TABLE> 



                                      62
<PAGE>
 
<TABLE> 
<C>             <C>     <C>       <C>        <S>                                                                <C> 
                 AAA      Aaa       21,600    Utah State, Building and Highway, UT, 4.40% due 7/01/1999               21,606

Virginia--0.5%   AAA      Aa2        2,400    Peninsula Ports Authority, Virginia, Revenue Refunding
                                              Bonds (Port Facility--Shell Oil Company Project), UPDATES,
                                              Series A, 3.60% due 12/01/2005 (b)                                       2,400

Washington--1.7% AA       Aa         1,800    Washington State, GO, Refunding, Series R-93B, 4.40%
                                              due 10/01/1998                                                           1,803
                                              Washington State Public Power Supply System, Revenue
                                              Refunding Bonds (Nuclear Project No. 2), Series A:
                 AA-      Aa         2,000       3.50% due 7/01/1996                                                   2,000
                 AA-      Aa         4,890       3.75% due 7/01/1997                                                   4,876

Wisconsin--3.6%  NR*      NR*        4,500    Ashland County, Wisconsin, Promissory Notes, 4.25%
                                              due 9/01/1997                                                            4,517
                 A        A1         2,795    Wisconsin Housing and EDA, Housing Revenue Refunding
                                              Bonds, Series C, 4.30% due 11/01/1997                                    2,802
                 AA       Aa        11,000    Wisconsin State, Refunding, GO, UT, Series 3, 4.25%
                                              due 11/01/1999                                                          10,918

Wyoming--0.3%    A1+      Aaa          200    Lincoln County, Wyoming, PCR (Exxon Project), AMT, VRDN,
                                              Series C, 3.70% due 7/01/2017 (b)                                          200
                 NR*      P1         1,425    Uinta County, Wyoming, PCR, Refunding (Chevron USA
                                              Incorporated Project), VRDN, 3.55% due 8/15/2020 (b)                     1,425

                 Total Investments (Cost--$496,214)--98.7%                                                           497,511

                 Other Assets Less Liabilities--1.3%                                                                   6,641
                                                                                                                    --------
                 Net Assets--100.0%                                                                                 $504,152
                                                                                                                    ========


              <FN>
              (a)Prerefunded.
              (b)The interest rate is subject to change periodically based upon
                 prevailing market rates. The interest rate shown is the rate in
                 effect at June 30, 1996.
              (c)AMBAC Insured.
              (d)MBIA Insured.
              (e)FSA Insured.
              (f)FGIC Insured.
              (g)Escrowed to maturity.
                *Not Rated.
               ++Highest short-term rating by Moody's Investors Service, Inc.

                
               Rating of issues shown have not been audited by Deloitte & Touche LLP.

               See Notes to Financial Statements.
</TABLE>



                                      63
<PAGE>
 
<TABLE>
STATEMENTS OF ASSETS AND LIABILITIES
<CAPTION>

                                                                                                              Limited
                                                                        Insured           National            Maturity
                    As of June 30, 1996                                Portfolio         Portfolio           Portfolio
<C>                 <S>                                            <C>                <C>                 <C>
Assets:             Investments, at value* (Note 1a)               $2,378,216,369     $1,403,759,064      $  497,510,898
                    Cash                                               27,802,116            621,582              78,675
                    Receivables:
                      Interest                                         43,608,418         25,652,906           6,517,139
                      Securities sold                                     130,000         15,051,045                  --
                      Capital shares sold                                 586,263            791,669           2,280,457
                    Prepaid registration fees and other
                    assets (Note 1e)                                      850,390             50,170              44,693
                                                                   --------------     --------------      --------------
                    Total assets                                    2,451,193,556      1,445,926,436         506,431,862
                                                                   --------------     --------------      --------------

Liabilities:        Payables:
                      Securities purchased                             77,126,436          1,118,400                  --
                      Capital shares redeemed                           3,873,814          2,302,326           1,565,546
                      Dividends to shareholders (Note 1f)               2,071,759          1,373,891             322,805
                      Investment adviser (Note 2)                         648,243            519,485             128,520
                      Distributor (Note 2)                                433,526            242,592              20,581
                    Accrued expenses and other liabilities                406,858            304,057             242,796
                                                                   --------------     --------------      --------------
                    Total liabilities                                  84,560,636          5,860,751           2,280,248
                                                                   --------------     --------------      --------------

Net Assets:         Net assets                                     $2,366,632,920     $1,440,065,685      $  504,151,614
                                                                   ==============     ==============      ==============

Net Assets          Class A Common Stock, $0.10 par value++        $   19,880,142     $    9,726,134      $    4,208,985
Consist of:         Class B Common Stock, $0.10 par value++++           9,146,309          3,950,194             717,064
                    Class C Common Stock, $0.10 par value++++++           239,405            131,415                 952
                    Class D Common Stock, $0.10 par value++++++++         654,425            433,709             160,220
                    Paid-in capital in excess of par                2,271,557,246      1,430,841,435         503,400,012
                    Accumulated realized capital losses on
                    investments--net (Note 5)                         (41,982,490)       (77,266,638)         (5,632,124)
                    Unrealized appreciation on
                    investments--net                                  107,137,883         72,249,436           1,296,505
                                                                   --------------     --------------      --------------
                    Net assets                                     $2,366,632,920     $1,440,065,685      $  504,151,614
                                                                   --------------     --------------      --------------

Net Asset           Class A:
Value:                Net assets                                   $1,572,834,522     $  983,550,131      $  417,097,299
                                                                   ==============     ==============      ==============
                      Shares outstanding                              198,801,419         97,261,338          42,089,848
                                                                   ==============     ==============      ==============
                      Net asset value and redemption
                      price per share                              $         7.91     $        10.11      $         9.91
                                                                   ==============     ==============      ==============
                    Class B:
                      Net assets                                   $  723,089,463     $  399,340,242      $   71,074,729
                                                                   ==============     ==============      ==============
                      Shares outstanding                               91,463,092         39,501,944           7,170,644
                                                                   ==============     ==============      ==============
                      Net asset value and redemption
                      price per share                              $         7.91     $        10.11      $         9.91
                                                                   ==============     ==============      ==============
                    Class C:
                      Net assets                                   $   18,936,443     $   13,291,171      $       94,043
                                                                   ==============     ==============      ==============
                      Shares outstanding                                2,394,049          1,314,145               9,519
                                                                   ==============     ==============      ==============
                      Net asset value and redemption
                      price per share                              $         7.91     $        10.11      $         9.88
                                                                   ==============     ==============      ==============
                    Class D:
                      Net assets                                   $   51,772,492     $   43,884,141      $   15,885,543
                                                                   ==============     ==============      ==============
                      Shares outstanding                                6,544,245          4,337,089           1,602,198
                                                                   ==============     ==============      ==============
                      Net asset value and redemption
                      price per share                              $         7.91     $        10.12      $         9.91
                                                                   ==============     ==============      ==============

</TABLE>


                                      64
<PAGE>
 
<TABLE> 
<S>         <C>                                                    <C>                <C>                 <C> 
<FN> 
                   *Identified cost                                $2,271,078,486     $1,331,509,628      $  496,214,393
                                                                   ==============     ==============      ==============
                  ++Authorized shares--Class A                        500,000,000        375,000,000         150,000,000
                                                                   ==============     ==============      ==============
                ++++Authorized shares--Class B                        375,000,000        375,000,000         150,000,000
                                                                   ==============     ==============      ==============
              ++++++Authorized shares--Class C                        375,000,000        375,000,000         150,000,000
                                                                   ==============     ==============      ==============
            ++++++++Authorized shares--Class D                        575,000,000        375,000,000         150,000,000
                                                                   ==============     ==============      ==============

                    See Notes to Financial Statements.
</TABLE> 

<TABLE>
STATEMENT OF OPERATIONS
<CAPTION>
                                                                                                              Limited
                                                                       Insured           National             Maturity
                    For the Year Ended June 30, 1996                  Portfolio          Portfolio           Portfolio
<C>                 <S>                                            <C>                <C>                 <C>
Investment          Interest and amortization of premium and
Income              discount earned                                $  147,630,923     $   95,242,010      $   24,596,058
(Note 1d):                                                         --------------     --------------      --------------
 
Expenses:           Investment advisory fees (Note 2)                   8,850,984          7,014,416           1,899,352
                    Account maintenance and distribution
                    fees--Class B (Note 2)                              5,668,976          3,059,804             307,014
                    Transfer agent fees--Class A (Note 2)                 592,796            412,428             163,675
                    Transfer agent fees--Class B (Note 2)                 340,996            203,687              42,090
                    Accounting services (Note 2)                          206,637            180,650              83,408
                    Custodian fees.                                       202,640            134,639              57,176
                    Printing and shareholder reports                      169,528             96,387              37,345
                    Registration fees (Note 1e)                            79,301            112,300             103,718
                    Professional fees                                     105,724             91,956              27,581
                    Account maintenance fees-- 
                    Class D (Note 2)                                       93,721             77,432              16,263
                    Account maintenance and distribution
                    fees--Class C (Note 2)                                105,361             72,516               2,182
                    Pricing services                                       44,555             27,627              16,527
                    Directors' fees and expenses                           25,641             15,082               8,836
                    Transfer agent fees--Class D (Note 2)                  13,353             12,328               5,697
                    Transfer agent fees--Class C (Note 2)                   6,639              4,422                 827
                    Other                                                  38,298             28,926             113,235
                                                                   --------------     --------------      --------------
                    Total expenses                                     16,545,150         11,544,600           2,884,926
                                                                   --------------     --------------      --------------
                    Investment income--net                            131,085,773         83,697,410          21,711,132
                                                                   --------------     --------------      --------------


Realized &          Realized gain (loss) on investments--net           (3,897,219)         3,774,748           1,322,566
Unrealized Gain     Change in unrealized appreciation/
(Loss) on           depreciation on investments--net                    3,149,618         10,373,235          (1,526,762)
Investments--Net                                                   --------------     --------------      --------------
(Notes 1b, 1d       Net Increase in Net Assets
& 3):               Resulting from Operations                      $  130,338,172     $   97,845,393      $   21,506,936
                                                                   ==============     ==============      ==============


                    See Notes to Financial Statements.
</TABLE>



                                      65
<PAGE>
 
<TABLE>
STATEMENTS OF CHANGES IN NET ASSETS
<CAPTION>
                                                             
Insured Portfolio                   National Portfolio
                                                          For the Year Ended June 30,        For the Year Ended June 30,
                    Increase (Decrease) in Net Assets:      1996             1995               1996             1995
<C>                 <S>                                <C>              <C>              <C>              <C>
Operations:         Investment income--net             $  131,085,773   $  145,464,480   $   83,697,410   $   90,299,833

                    Realized gain (loss) on
                    investments--net                       (3,897,219)     (38,085,273)       3,774,748      (77,312,475)
                    Change in unrealized appreciation/
                    depreciation on investments--net        3,149,618       91,672,331       10,373,235       98,337,487
                                                       --------------   --------------   --------------   --------------
                    Net increase in net assets
                    resulting from operations             130,338,172      199,051,538       97,845,393      111,324,845
                                                       --------------   --------------   --------------   --------------


Dividends &         Investment income--net:
Distributions to      Class A                             (92,116,281)    (104,032,884)     (60,489,070)     (67,078,481)
Shareholders          Class B                             (36,347,050)     (40,656,294)     (20,995,504)     (22,561,653)
(Note 1f):            Class C                                (626,972)        (120,450)        (462,078)         (90,229)
                      Class D                              (1,995,470)        (654,852)      (1,750,758)        (569,470)
                    Realized gain on investments--net:
                      Class A                                      --      (31,614,511)              --      (20,402,246)
                      Class B                                      --      (14,155,831)              --       (7,752,072)
                      Class C                                      --          (23,608)              --          (26,597)
                      Class D                                      --         (104,611)              --         (171,804)
                    In excess of realized gain on
                    investments--net:
                      Class A                                      --               --               --       (2,695,572)
                      Class B                                      --               --               --       (1,024,214)
                      Class C                                      --               --               --           (3,514)
                      Class D                                      --               --               --          (22,699)
                                                       --------------   --------------   --------------   --------------
                    Net decrease in net assets
                    resulting from dividends and
                    distributions to shareholders.       (131,085,773)    (191,363,041)     (83,697,410)    (122,398,551)
                                                       --------------   --------------   --------------   --------------


Capital Share       Net decrease in net assets derived
Transactions        from capital share transactions      (155,203,186)    (293,039,051)     (78,305,357)    (147,053,135)
(Note 4):                                              --------------   --------------   --------------   --------------
         
Net Assets:         Total decrease in net assets         (155,950,787)    (285,350,554)     (64,157,374)    (158,126,841)
                    Beginning of year.                  2,522,583,707    2,807,934,261    1,504,223,059    1,662,349,900
                                                       --------------   --------------   --------------   --------------
                    End of year                        $2,366,632,920   $2,522,583,707   $1,440,065,685   $1,504,223,059
                                                       ==============   ==============   ==============   ==============

<CAPTION>

                                                                                            Limited Maturity Portfolio
                                                                                            For the Year Ended June 30,
                    Increase (Decrease) in Net Assets:                                         1996             1995
<C>                 <S>                                                                  <C>              <C>
Operations:         Investment income--net                                               $   21,711,132   $   31,100,101
                    Realized gain (loss) on investments--net                                  1,322,566       (1,760,975)
                    Change in unrealized appreciation/ depreciation on investments--net      (1,526,762)       4,210,861
                                                                                         --------------   --------------
                    Net increase in net assets resulting from operations                     21,506,936       33,549,987
                                                                                         --------------   --------------

Dividends &         Investment income--net:
Distributions to      Class A                                                               (18,019,083)     (25,771,957)
Shareholders          Class B                                                                (3,055,609)      (5,094,228)
(Note 1f):            Class C                                                                   (25,939)         (45,930)
                      Class D                                                                  (610,501)        (187,986)
                    Realized gain on investments--net:
                      Class A                                                                        --               --
                      Class B                                                                        --               --
                      Class C                                                                        --               --
                      Class D                                                                        --               --
                    In excess of realized gain on
                    investments--net:
                      Class A                                                                        --               --
                      Class B                                                                        --               --
                      Class C                                                                        --               --
                      Class D                                                                        --               --
                    Net decrease in net assets resulting from dividends and
                    distributions to shareholders.                                          (21,711,132)     (31,100,101)
                                                                                         --------------   --------------


Capital Share       Net decrease in net assets derived from capital share transactions     (176,922,554)    (256,848,291)
Transactions                                                                             --------------   --------------
(Note 4): 
                       
Net Assets:         Total decrease in net assets                                           (177,126,750)    (254,398,405)
                    Beginning of year.                                                      681,278,364      935,676,769
                                                                                         --------------   --------------
                    End of year                                                          $  504,151,614   $  681,278,364
                                                                                         ==============   ==============

                    See Notes to Financial Statements.
</TABLE>

<TABLE>
FINANCIAL HIGHLIGHTS
<CAPTION>
                    The following per share data                               Insured Portfolio
                    and ratios have been derived
                    from information provided                                      Class A
                    in the financial statements.
                                                                         For the Year Ended June 30,
                    Increase (Decrease) in
                    Net Asset Value:                  1996          1995          1994            1993         1992
<C>                 <S>                         <C>            <C>            <C>            <C>            <C>   
Per Share           Net asset value,
Operating           beginning of year           $       7.92   $       7.88   $       8.64   $       8.26   $       7.92
Performance:                                    ------------   ------------   ------------   ------------   ------------
                    Investment income--net               .44            .46            .47            .50            .52
                    Realized and unrealized
                    gain (loss) on
                    investments--net                    (.01)           .18           (.53)           .49            .41
                                                ------------   ------------   ------------   ------------   ------------
</TABLE> 


                                      66
<PAGE>
 
<TABLE> 
<CAPTION> 
 <C>              <S>                          <C>            <C>            <C>            <C>            <C> 
                    Total from investment
                    operations                           .43            .64           (.06)           .99            .93
                                                ------------   ------------   ------------   ------------   ------------
                    Less dividends and
                    distributions:
                      Investment income--net            (.44)          (.46)          (.47)          (.50)          (.52)
                      Realized gain on
                      investments--net                    --           (.14)          (.23)          (.11)          (.07)
                                                ------------   ------------   ------------   ------------   ------------
                    Total dividends and
                    distributions                       (.44)          (.60)          (.70)          (.61)          (.59)
                                                ------------   ------------   ------------   ------------   ------------
                    Net asset value,
                    end of year                 $       7.91   $       7.92   $       7.88   $       8.64   $       8.26
                                                ============   ============   ============   ============   ============

Total Investment    Based on net asset value
Return:*            per share                          5.51%          8.60%         (1.08%)        12.41%         12.11%
                                                ============   ============   ============   ============   ============

Ratios to Average   Expenses                            .43%           .43%           .42%           .42%           .44%
Net Assets:                                     ============   ============   ============   ============   ============
                    Investment income--net             5.55%          5.78%          5.53%          5.94%          6.44%
                                                ============   ============   ============   ============   ============
Supplemental        Net assets, end of
Data:               year (in thousands)         $  1,572,835   $  1,706,064   $  1,941,741   $  2,225,188   $  2,062,591
                                                ============   ============   ============   ============   ============
                    Portfolio turnover                78.49%         35.61%         28.34%         43.86%         22.50%
                                                ============   ============   ============   ============   ============
</TABLE> 

<TABLE> 
<CAPTION>
                    The following per share data                              Insured Portfolio
                    and ratios have been derived
                    from information provided                                     Class B
                    in the financial statements.
                                                                        For the Year Ended June 30,
                    Increase (Decrease) in
                    Net Asset Value:                  1996          1995          1994            1993         1992
<C>                 <S>                         <C>            <C>            <C>            <C>            <C>   
Per Share           Net asset value,
Operating           beginning of year           $       7.92   $       7.87   $       8.63   $       8.26   $       7.92
Performance:                                    ------------   ------------   ------------   ------------   ------------
                    Investment income--net               .38            .40            .40            .44            .46
                    Realized and unrealized
                    gain(loss) on
                    investments--net                    (.01)           .19           (.53)           .48            .41
                                                ------------   ------------   ------------   ------------   ------------
                    Total from investment
                    operations                           .37            .59           (.13)           .92            .87
                                                ------------   ------------   ------------   ------------   ------------

                    Less dividends and
                    distributions:
                      Investment income--net            (.38)          (.40)          (.40)          (.44)          (.46)
                      Realized gain on
                      investments--net                    --           (.14)          (.23)          (.11)          (.07)
                                                ------------   ------------   ------------   ------------   ------------
                    Total dividends and
                    distributions                       (.38)          (.54)          (.63)          (.55)          (.53)
                                                ------------   ------------   ------------   ------------   ------------
                    Net asset value,
                    end of year                 $       7.91   $       7.92   $       7.87   $       8.63   $       8.26
                                                ============   ============   ============   ============   ============

Total Investment    Based on net asset
Return:*            value per share                    4.71%          7.91%         (1.81%)        11.44%         11.27%
                                                ============   ============   ============   ============   ============


Ratios to Average   Expenses                           1.19%          1.19%          1.17%          1.18%          1.19%
Net Assets:                                     ============   ============   ============   ============   ============
                    Investment income--net             4.80%          5.03%          4.78%          5.17%          5.69%
                                                ============   ============   ============   ============   ============

Supplemental        Net assets, end of
Data:               year (in thousands)         $    723,090   $    782,748   $    866,193   $    911,307   $    706,016
                                                ============   ============   ============   ============   ============
                    Portfolio turnover                78.49%         35.61%         28.34%         43.86%         22.50%
                                                ============   ============   ============   ============   ============

                   <FN>
                   *Total investment returns exclude the effects of sales loads.

                    See Notes to Financial Statements.
</TABLE>

                                      67
<PAGE>
 
<TABLE>
FINANCIAL HIGHLIGHTS (continued)
<CAPTION>
                                                                                  Insured Portfolio
                    The following per share data and
                    ratios have been derived from                   
                    information provided in                           Class C                         Class D
                    the financial statements.                
                                                              For the      For the Period       For the     For the Period
                    Increase (Decrease) in                   Year Ended  Oct. 21, 1994++ to   Year Ended  to Oct. 21, 1994++
                    Net Asset Value:                        June 30, 1996   June 30, 1995   June 30, 1996   June 30, 1995
<C>                 <S>                                      <C>             <C>             <C>             <C>   
Per Share           Net asset value,
Operating           beginning of period                      $       7.92    $       7.68    $       7.92    $      7.68
Performance:                                                 ------------    ------------    ------------    -----------
                    Investment income--net                            .38             .27             .42            .29
                    Realized and unrealized gain
                    loss) on investments--net                        (.01)            .38            (.01)           .38
                                                             ------------    ------------    ------------    -----------
                    Total from investment operations                  .37             .65             .41            .67
                                                             ------------    ------------    ------------    -----------
                    Less dividends and
                    distributions:
                      Investment income--net                         (.38)           (.27)           (.42)          (.29)
                      Realized gain on
                      investments--net                                 --            (.14)             --           (.14)
                                                             ------------    ------------    ------------    -----------
                    Total dividends and distributions                (.38)           (.41)           (.42)          (.43)
                                                             ------------    ------------    ------------    -----------
                    Net asset value, end of period           $       7.91    $       7.92    $       7.91   $       7.92
                                                             ============    ============    ============   ============


Total Investment    Based on net asset
Return:**           value per share                                 4.65%           8.83%+++        5.25%          9.24%+++
                                                             ============    ============    ============   ============


Ratios to Average   Expenses                                        1.24%           1.23%*           .68%           .68%*
Net Assets:                                                  ============    ============    ============   ============
                    Investment income--net                          4.75%           4.93%*          5.31%          5.50%*
                                                             ============    ============    ============   ============


Supplemental        Net assets, end of period
Data:               (in thousands)                           $     18,936    $      7,756    $     51,772   $     26,015
                                                             ============    ============    ============   ============
                    Portfolio turnover                             78.49%          35.61%          78.49%         35.61%
                                                             ============    ============    ============   ============


<CAPTION>
                    The following per share data                              National Portfolio
                    and ratios have been derived
                    from information provided                                      Class A
                    in the financial statements.
                                                                          For the Year Ended June 30,
                    Increase (Decrease) in
                    Net Asset Value:                  1996          1995          1994            1993         1992
<C>                 <S>                         <C>            <C>            <C>            <C>            <C>
Per Share           Net asset value,
Operating           beginning of year           $      10.02   $      10.08   $      11.02   $      10.64   $      10.17
Performance:                                    ------------   ------------   ------------   ------------   ------------
                    Investment income--net               .60            .60            .62            .67            .71
                    Realized and unrealized
                    gain (loss) on
                    investments--net                     .09            .15           (.64)           .57            .58
                                                ------------   ------------   ------------   ------------   ------------
                    Total from investment
                    operations                           .69            .75           (.02)          1.24           1.29
                                                ------------   ------------   ------------   ------------   ------------
                    Less dividends and
                    distributions:
                      Investment income--net            (.60)          (.60)          (.62)          (.67)          (.71)
                      Realized gain on
                      investments--net                    --           (.19)          (.30)          (.19)          (.11)
                      In excess of realized
                      gain on investments--net            --           (.02)            --             --             --
                                                ------------   ------------   ------------   ------------   ------------
                    Total dividends and
                    distributions                       (.60)          (.81)          (.92)          (.86)          (.82)
                                                ------------   ------------   ------------   ------------   ------------
                    Net asset value,
                    end of year                 $      10.11   $      10.02   $      10.08   $      11.02   $      10.64
                                                ============   ============   ============   ============   ============


Total Investment    Based on net asset
Return:**           value per share                    6.98%          7.89%          (.47%)        12.19%         13.09%
                                                ============   ============   ============   ============   ============


Ratios to Average   Expenses                            .56%           .56%           .55%           .55%           .55%
Net Assets:                                     ============   ============   ============   ============   ============
                    Investment income--net             5.89%          6.01%          5.72%          6.23%          6.80%
                                                ============   ============   ============   ============   ============


Supplemental        Net assets, end of
Data:               year (in thousands)         $    983,550   $  1,059,440   $  1,203,181   $  1,353,805   $  1,278,055
                                                ============   ============   ============   ============   ============
                    Portfolio turnover                95.09%        103.65%         73.33%         65.43%         50.94%
                                                ============   ============   ============   ============   ============


</TABLE> 



                                      68
<PAGE>
 
<TABLE> 
<CAPTION>  

                    The following per share data                              National Portfolio
                    and ratios have been derived
                    from information provided                                      Class B
                    in the financial statements.
                                                                         For the Year Ended June 30,
                    Increase (Decrease) in
                    Net Asset Value:                  1996          1995          1994            1993         1992
<S>                                             <C>            <C>            <C>            <C>            <C>
Per Share           Net asset value,
Operating           beginning of year           $      10.02   $      10.07   $      11.02   $      10.63   $      10.16
Performance:                                    ------------   ------------   ------------   ------------   ------------
                    Investment income--net               .52            .52            .54            .59            .63
                    Realized and unrealized
                    gain (loss) on
                    investments--net                     .09            .16           (.65)           .58            .58
                                                ------------   ------------   ------------   ------------   ------------
                    Total from investment
                    operations                           .61            .68           (.11)          1.17           1.21
                                                ------------   ------------   ------------   ------------   ------------
                    Less dividends and
                    distributions:
                      Investment income--net            (.52)          (.52)          (.54)          (.59)          (.63)
                      Realized gain on
                      investments--net                    --           (.19)          (.30)          (.19)          (.11)
                      In excess of realized
                      gain on investments--net            --           (.02)            --             --             --
                                                ------------   ------------   ------------   ------------   ------------
                    Total dividends and
                    distributions                       (.52)          (.73)          (.84)          (.78)          (.74)
                                                ------------   ------------   ------------   ------------   ------------
                    Net asset value,
                    end of year                 $      10.11   $      10.02   $      10.07   $      11.02   $      10.63
                                                ============   ============   ============   ============   ============

Total Investment    Based on net asset
Return:**           value per share                    6.17%          7.28%         (1.39%)        11.45%         12.25%
                                                ============   ============   ============   ============   ============



Ratios to           Expenses                           1.32%          1.32%          1.30%          1.31%          1.31%
Average Net                                     ============   ============   ============   ============   ============
Assets:             Investment income--net             5.13%          5.25%          4.97%          5.46%          6.03%
                                                ============   ============   ============   ============   ============


Supplemental        Net assets, end of
Data:               year (in thousands)         $    399,341   $    419,933   $    459,169   $    424,071   $    286,375
                                                ============   ============   ============   ============   ============
                    Portfolio turnover                95.09%        103.65%         73.33%         65.43%         50.94%
                                                ============   ============   ============   ============   ============

                 <FN>
                   *Annualized.
                  **Total investment returns exclude the effects of sales loads.
                  ++Commencement of Operations.
                 +++Aggregate total investment return.


                    See Notes to Financial Statements.
</TABLE>



                                      69
<PAGE>
 
<TABLE>
FINANCIAL HIGHLIGHTS (concluded)
<CAPTION>
                                                                                  National Portfolio
                    The following per share data and
                    ratios have been derived from                 
                    information provided in                           Class C                         Class D
                    the financial statements.                  For the    For the Period       For the     For the Period
                    Increase (Decrease) in                   Year Ended  Oct. 21, 1994++ to   Year Ended  to Oct. 21, 1994++
                    Net Asset Value:                        June 30, 1996   June 30, 1995   June 30, 1996   June 30, 1995
<C>                 <S>                                      <C>             <C>             <C>             <C>   
Per Share           Net asset value,
Operating           beginning of period                      $      10.03    $       9.85    $      10.03   $       9.85
Performance:                                                 ------------    ------------    ------------   ------------
                    Investment income--net                            .52             .36             .57            .40
                    Realized and unrealized gain on
                    investments--net                                  .08             .39             .09            .39
                                                             ------------    ------------    ------------   ------------
                    Total from investment operations                  .60             .75             .66            .79
                                                             ------------    ------------    ------------   ------------
                    Less dividends and distributions:
                      Investment income--net                         (.52)           (.36)           (.57)          (.40)
                      Realized gain on investments--net                --            (.19)             --           (.19)
                      In excess of realized gain on
                      investments--net                                 --            (.02)             --           (.02)
                                                             ------------    ------------    ------------   ------------
                    Total dividends and distributions                (.52)           (.57)           (.57)          (.61)
                                                             ------------    ------------    ------------   ------------
                    Net asset value, end of period           $      10.11    $      10.03    $      10.12   $      10.03
                                                             ============    ============    ============   ============


Total Investment    Based on net asset value per share              6.01%           7.97%+++        6.71%          8.37%+++
Return:**                                                    ============    ============    ============   ============


Ratios to Average   Expenses                                        1.37%           1.37%*           .81%          .81%*
Net Assets:                                                  ============    ============    ============   ============
                    Investment income--net                          5.08%           5.21%*          5.64%         5.78%*
                                                             ============    ============    ============   ============


Supplemental        Net assets, end of
Data:               period (in thousands)                    $     13,291    $      5,195    $     43,884   $     19,656
                                                             ============    ============    ============   ============
                    Portfolio turnover                             95.09%         103.65%          95.09%        103.65%
                                                             ============    ============    ============   ============


<CAPTION>
                    The following per share data                           Limited Maturity Portfolio
                    and ratios have been derived
                    from information provided                                       Class A
                    in the financial statements.
                                                                           For the Year Ended June 30,
                    Increase (Decrease) in
                    Net Asset Value:                1996            1995           1994           1993           1992
<C>                 <S>                         <C>            <C>            <C>            <C>            <C>
Per Share           Net asset value,
Operating           beginning of year           $       9.92   $       9.87   $      10.01   $       9.91   $       9.75
Performance:                                    ------------   ------------   ------------   ------------   ------------
                    Investment income--net               .38            .38            .37            .41            .50
                    Realized and unrealized
                    gain (loss) on
                    investments--net                    (.01)           .05           (.14)            .10           .16
                                                ------------   ------------   ------------   ------------   ------------
                    Total from investment
                    operations                           .37            .43            .23            .51            .66
                                                ------------   ------------   ------------   ------------   ------------
                    Less dividends from
                    investment income--net              (.38)          (.38)          (.37)          (.41)          (.50)
                                                ------------   ------------   ------------   ------------   ------------
                    Net asset value,
                    end of year                 $       9.91   $       9.92   $       9.87   $      10.01   $       9.91
                                                ============   ============   ============   ============   ============


Total Investment    Based on net asset value
Return:**           per share                          3.75%          4.53%          2.30%          5.28%          6.93%
                                                ============   ============   ============   ============   ============


Ratios to Average   Expenses                            .44%           .41%           .40%           .41%           .40%
Net Assets:                                     ============   ============   ============   ============   ============
                    Investment income--net             3.83%          3.86%          3.68%          4.13%          5.02%
                                                ============   ============   ============   ============   ============


Supplemental        Net assets, end of
Data:               year (in thousands)         $    417,097   $    536,474   $    790,142   $    846,736   $    613,407
                                                ============   ============   ============   ============   ============
                    Portfolio turnover                88.32%         37.33%         45.67%         65.43%         96.32%
                                                ============   ============   ============   ============   ============


</TABLE> 



                                      70
<PAGE>
 
<TABLE> 
 <CAPTION>
                                                                                Limited Maturity Portfolio
                    The following per share data
                    ratios have been derived                                             Class B
                    from information provided
                    in the financial statements.                                                          For the Period
                                                                     For the Year Ended June 30,         Nov. 2, 1992++ to
                    Increase (Decrease) in Net Asset Value:       1996           1995          1994        June 30, 1993
<C>                 <S>                                      <C>             <C>             <C>            <C>
Per Share           Net asset value,
Operating           beginning of period                      $       9.92    $       9.87    $      10.01   $       9.93
Performance:                                                 ------------    ------------    ------------   ------------
                    Investment income--net                            .35             .35             .33            .24
                    Realized and unrealized gain
                    (loss) on investments--net                       (.01)            .05            (.14)           .08
                                                             ------------    ------------    ------------   ------------
                    Total from investment operations                  .34             .40             .19            .32
                                                             ------------    ------------    ------------   ------------
                    Less dividends from investment
                    income--net                                      (.35)           (.35)           (.33)          (.24)
                                                             ------------    ------------    ------------   ------------
                    Net asset value, end of period           $       9.91    $       9.92    $       9.87   $      10.01
                                                             ============    ============    ============   ============


Total Investment    Based on net asset value per share              3.37%           4.14%           1.98%          3.26%+++
Return:**                                                    ============    ============    ============   ============


Ratios to Average   Expenses                                         .80%            .78%            .76%           .76%*
Net Assets:                                                  ============    ============    ============   ============
                    Investment income--net                          3.46%           3.50%           3.33%          3.60%*
                                                             ============    ============    ============   ============


Supplemental        Net assets, end of period
Data:               (in thousands)                           $     71,075    $     29,581    $    145,534   $     95,179
                                                             ============    ============    ============   ============
                    Portfolio turnover                             88.32%          37.33%          45.67%         65.43%
                                                             ============    ============    ============   ============


<CAPTION>
                                                                                  Limited Maturity Portfolio
                    The following per share data and
                    ratios have been derived from                   
                    information provided in                           Class C                         Class D
                    the financial statements.                
                                                              For the      For the Period       For the     For the Period
                    Increase (Decrease) in                   Year Ended  Oct. 21, 1994++ to   Year Ended  to Oct. 21, 1994++
                    Net Asset Value:                        June 30, 1996   June 30, 1995   June 30, 1996   June 30, 1995
<S>                 <S>                                      <C>           <C>             <C>             <C>   
Per Share           Net asset value,
Operating           beginning of period                      $       9.92    $       9.83    $       9.93   $       9.83
Performance:                                                 ------------    ------------    ------------   ------------
                    Investment income--net                            .34             .25             .37            .26
                    Realized and unrealized gain
                    (loss) on investments--net                       (.04)            .09            (.02)           .10
                                                             ------------    ------------    ------------   ------------
                    Total from investment operations                  .30             .34             .35            .36
                                                             ------------    ------------    ------------   ------------
                    Less dividends from investment
                    income--net                                      (.34)           (.25)           (.37)          (.26)
                                                             ------------    ------------    ------------   ------------
                    Net asset value, end of period           $       9.88    $       9.92    $       9.91   $       9.93
                                                             ============    ============    ============   ============


Total Investment    Based on net asset value per share              2.97%           3.52%+++        3.55%          3.73%+++
Return:**                                                    ============    ============    ============   ============


Ratios to Average   Expenses                                         .80%            .70%*           .54%           .53%*
Net Assets:                                                  ============    ============    ============   ============
                    Investment income--net                          3.41%           3.61%*          3.71%          3.78%*
                                                             ============    ============    ============   ============


Supplemental        Net assets, end of period
Data:               (in thousands)                           $         94    $      3,965    $     15,886   $     11,258
                                                             ============    ============    ============   ============
                    Portfolio turnover                             88.32%          37.33%          88.32%         37.33%
                                                             ============    ============    ============   ============

                 <FN>
                   *Annualized.
                  **Total investment returns exclude the effects of sales loads.
                  ++Commencement of Operations.
                 +++Aggregate total investment return.


                    See Notes to Financial Statements.
</TABLE>



                                      71
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS


1. Significant Accounting Policies:
Merrill Lynch Municipal Bond Fund, Inc. (the "Fund") is registered under the
Investment Company Act of 1940 as a diversified, open-end management investment
company. The Fund's Portfolios offer 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--Insured Portfolio: Where bonds in the Portfolio
have not been insured pursuant to policies obtained by the issuer, the Fund has
obtained insurance with respect to the payment of interest and principal of each
bond. Such insurance is valid as long as the bonds are held by the Fund.

All Portfolios: Municipal bonds and money market securities are traded primarily
in the over-the-counter markets and are valued at the most recent bid price or
yield equivalent as obtained from dealers that make markets in such securities.
Positions in futures contracts and options thereon, which are traded on
exchanges, are valued at closing prices as of the close of such exchanges.
Assets for which market quotations are not readily available are valued at fair
value on a consistent basis using methods determined in good faith by the Fund's
Board of Directors, including valuations furnished by a pricing service retained
by the Fund, which may utilize a matrix system for valuations. The procedures of
the pricing service and its valuations are reviewed by the officers of the Fund
under the general supervision of the Board of Directors.

(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.

* Financial futures contracts--The National and Limited Maturity Portfolios (the
"Portfolios") 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 Portfolios deposit
and maintain as collateral such initial margin as required by the exchange on
which the transaction is effected. Pursuant to the contract, the Portfolios
agree 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 Portfolios as unrealized gains or
losses. When the contract is closed, the Portfolios record 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) Prepaid registration fees--Prepaid registration fees are charged to expenses
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. Distributions in excess of realized capital gains are due
primarily to differing tax treatments for futures transactions and post-October
losses.

(g) Reclassification--Generally accepted accounting principles require that
certain components of net assets be reclassified to reflect permanent
differences between financial reporting and tax purposes. Accordingly, current
year's permanent book/tax differences of $463, $17,087, and $54 have been
reclassified from paid-in capital in excess of par to accumulated net realized
capital losses in the Insured, National, and Limited Maturity Portfolios,
respectively. These reclassifications have no effect on net assets or net asset
values per share.

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 Merrill Lynch Funds Distributor, Inc.
("MLFD" or "Distributor"), a wholly-owned subsidiary of Merrill Lynch Group,
Inc.


                                      72
<PAGE>


FAM is responsible for the management of the Fund's portfolios and provides the
necessary personnel, facilities, equipment and certain other services necessary
to the operation of the Fund. For such services, FAM receives at the end of each
month a fee with respect to each Portfolio at the annual rates set forth below
which are based upon the average daily value of the Fund's net assets.


                                        Rate of Advisory Fee
Aggregate of Average Daily                                Limited
Net Assets of the Three           Insured     National   Maturity
Combined Portfolios              Portfolio   Portfolio  Portfolio

Not exceeding $250 million         .40 %        .50 %       .40 %

In excess of $250 million
but not exceeding $400 million     .375         .475        .375

In excess of $400 million
but not exceeding $550 million     .375         .475        .35

In excess of $550 million
but not exceeding $1.5 billion     .375         .475        .325

In excess of $1.5 billion          .35          .475        .325


The Investment Advisory Agreement obligates FAM to reimburse the Fund to the
extent that the Fund's expenses (excluding interest, taxes, distribution fees,
brokerage fees and commissions and extraordinary items) exceed 2.5% of the
Fund's first $30 million of average daily net assets, 2.0% of the Fund's next
$70 million of average daily net assets, and 1.5% of the average daily net
assets in excess thereof. No fee payment will be made to FAM with respect to any
Portfolio during any fiscal year which will cause the expenses of such Portfolio
to exceed the pro rata expense limitation applicable to such Portfolio at the
time of such payment.

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 Fees                Distribution Fees
                                 Limited                              Limited
          Insured    National    Maturity     Insured     National    Maturity
         Portfolio  Portfolio   Portfolio    Portfolio   Portfolio    Portfolio

Class B      .25%      .25%        .15%         .50%         .50%      .20%
Class C      .25%      .25%        .15%         .55%         .55%      .20%
Class D      .25%      .25%        .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 June 30, 1996, MLFD earned underwriting discounts and direct
commissions and MLPF&S earned dealer concessions on sales of the Fund's Class A
and Class D Shares as follows:

                                                          Limited
                         Insured           National       Maturity
                        Portfolio         Portfolio      Portfolio
Class A Shares:
MLFD                   $ 38,116           $ 20,524        $ 2,032
MLPF&S                  274,069            177,142         19,981


Class D Shares:
MLFD                     13,179             12,764          3,167
MLPF&S                   97,008            115,279         30,565

For the year ended June 30, 1996, MLPF&S received contingent deferred sales
charges of $1,911,883 relating to transactions in Class B Shares, amounting to
$1,033,602, $771,851 and $106,430 in the Insured, National and Limited Maturity
Portfolios, respectively, and $15,842 relating to transactions in Class C
Shares, amounting to $7,257, $6,455 and $2,130 in the Insured, National and
Limited Maturity Portfolios, 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 directors of the Fund are officers and/or directors of
FAM, PSI, MLFD, MLFDS, MLPF&S, and/or ML & Co.

3. Investments:
Purchases and sales of investments, excluding short-term securities, for the
year ended June 30, 1996, were as follows:


                                 Purchases           Sales

Insured Portfolio             $1,795,967,814   $2,251,996,964
National Portfolio             1,329,268,746    1,387,520,156
Limited Maturity Portfolio       454,092,780      613,329,200


Net realized and unrealized gains (losses) as of June 30, 1996 were as follows:


                                   Realized      Unrealized
Insured Portfolio               Gains (Losses)     Gains

Long-term investments           $  (3,980,157) $ 107,137,883
Short-term investments                 82,938             --
                                -------------  -------------
Total                           $  (3,897,219) $ 107,137,883
                                =============  =============


                                      73
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS (continued)



                                   Realized      Unrealized
National Portfolio              Gains (Losses)     Gains

Long-term investments           $   4,887,206  $  72,249,436
Short-term investments                  1,948             --
Financial future contracts         (1,114,406)            --
                                -------------  -------------
Total                           $   3,774,748  $  72,249,436
                                =============  =============



                                   Realized      Unrealized
Limited Maturity Portfolio          Gains          Gains

Long-term investments           $   1,203,114  $   1,287,751
Short-term investments                119,452          8,754
                                -------------  -------------
Total                           $   1,322,566  $   1,296,505
                                =============  =============


As of June 30, 1996 net unrealized appreciation for Federal income tax purposes
were as follows:


                         Gross          Gross           Net
                       Unrealized     Unrealized     Unrealized
                      Appreciation   Depreciation   Appreciation

Insured Portfolio    $109,707,302    $(4,286,066)   $105,421,236
National Portfolio     75,776,361     (3,781,171)     71,995,190
Limited Maturity
Portfolio               2,375,833     (1,079,328)      1,296,505


The aggregate cost of investments at June 30, 1996 for Federal income tax
purposes was $2,272,795,133 for the Insured Portfolio, $1,331,763,874 for the
National Portfolio, and $496,214,393 for the Limited Maturity Portfolio.


4. Capital Share Transactions:
Net decrease in net assets derived from capital share transactions for the years
ended June 30, 1996 and June 30, 1995 were $155,203,186 and $293,039,051,
respectively, for the Insured Portfolio; $78,305,357 and $147,053,135,
respectively, for the National Portfolio and $176,922,554 and $256,848,291,
respectively, for the Limited Maturity Portfolio.

Transactions in capital shares for each class were as follows:


Insured Portfolio

Class A Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                         5,469,354  $  44,001,252
Shares issued to shareholders
in reinvestment of dividends        4,986,858     40,042,330
                                -------------  -------------
Total issued                       10,456,212     84,043,582

Shares redeemed                   (27,028,706)  (217,178,396)
                                -------------  -------------
Net decrease                      (16,572,494) $(133,134,814)
                                =============  =============


Insured Portfolio

Class A Shares for the Year                         Dollar
Ended June 30, 1995                   Shares        Amount

Shares sold                        17,244,995  $ 133,588,440
Shares issued to shareholders
in reinvestment of dividends &
distributions                       5,993,847     46,501,518
                                -------------  -------------
Total issued                       23,238,842    180,089,958
Shares redeemed                   (54,299,693)  (419,430,676)
                                -------------  -------------
Net decrease                      (31,060,851) $(239,340,718)
                                =============  =============


Insured Portfolio

Class B Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                        13,419,351  $ 107,963,983
Shares issued to shareholders
in reinvestment of dividends        2,346,122     18,823,418
                                -------------  -------------
Total issued                       15,765,473    126,787,401
Automatic conversion of shares       (355,991)    (2,835,885)
Shares redeemed                   (22,831,309)  (183,110,029)
                                -------------  -------------
Net decrease                       (7,421,827) $ (59,158,513)
                                =============  =============


Insured Portfolio

Class B Shares for the Year                         Dollar
Ended June 30, 1995                   Shares        Amount

Shares sold                        16,066,095  $ 123,787,819
Shares issued to shareholders
in reinvestment of dividends &
distributions                       2,730,539     21,164,361
                                -------------  -------------
Total issued                       18,796,634    144,952,180
Automatic conversion of shares         (8,999)       (69,008)
Shares redeemed                   (29,913,866)  (230,944,682)
                                -------------  -------------
Net decrease                      (11,126,231) $ (86,061,510)
                                =============  =============


Insured Portfolio

Class C Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                         1,893,607  $  15,225,385
Shares issued to shareholders
in reinvestment of dividends           53,775        431,720
                                -------------  -------------
Total issued                        1,947,382     15,657,105
Shares redeemed                      (532,614)    (4,266,135)
                                -------------  -------------
Net increase                        1,414,768  $  11,390,970
                                =============  =============


                                      74
<PAGE>
 
Insured Portfolio

Class C Shares for the Period
October 21, 1994++ to                               Dollar
June 30, 1995                         Shares        Amount

Shares sold                         1,136,288  $   8,839,400
Shares issued to shareholders
in reinvestment of dividends &
distributions                          10,357         81,730
                                -------------  -------------
Total issued                        1,146,645      8,921,130
Shares redeemed                      (167,364)    (1,318,478)
                                -------------  -------------
Net increase                          979,281  $   7,602,652
                                =============  =============

[FN]
++Commencement of Operations.


Insured Portfolio

Class D Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                        14,968,451  $ 120,849,832
Automatic conversion of shares        355,872      2,835,885
Shares issued to shareholders
in reinvestment of dividends          118,797        953,911
                                -------------  -------------
Total issued                       15,443,120    124,639,628
Shares redeemed                   (12,181,923)   (98,940,457)
                                -------------  -------------
Net increase                        3,261,197  $  25,699,171
                                =============  =============


Insured Portfolio

Class D Shares for the Period
October 21, 1994++ to                               Dollar
June 30, 1995                         Shares        Amount

Shares sold                         5,713,054  $  43,851,761
Automatic conversion of shares          8,988         69,008
Shares issued to shareholders
in reinvestment of dividends &
distributions                          41,138        324,130
                                -------------  -------------
Total issued                        5,763,180     44,244,899
Shares redeemed                    (2,480,132)   (19,484,374)
                                -------------  -------------
Net increase                        3,283,048  $  24,760,525
                                =============  =============

[FN]
++Commencement of Operations.



National Portfolio

Class A Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                         1,874,548  $  19,100,358
Shares issued to shareholders
in reinvestment of dividends        2,851,242     29,021,298
                                -------------  -------------
Total issued                        4,725,790     48,121,656

Shares redeemed                   (13,151,450)  (133,904,005)
                                -------------  -------------
Net decrease                       (8,425,660) $ (85,782,349)
                                =============  =============


National Portfolio

Class A Shares for the Year                         Dollar
Ended June 30, 1995                   Shares        Amount

Shares sold                         3,950,018  $  38,999,667
Shares issued to shareholders
in reinvestment of dividends &
distributions                       4,615,676     44,866,990
                                -------------  -------------
Total issued                        8,565,694     83,866,657
Shares redeemed                   (22,289,533)  (218,456,423)
                                -------------  -------------
Net decrease                      (13,723,839) $(134,589,766)
                                =============  =============


National Portfolio

Class B Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                         6,798,097  $  69,266,670
Shares issued to shareholders
in reinvestment of dividends          964,834      9,817,408
                                -------------  -------------
Total issued                        7,762,931     79,084,078
Automatic conversion of shares       (175,462)    (1,776,371)
Shares redeemed                    (9,989,397)  (101,634,492)
                                -------------  -------------
Net decrease                       (2,401,928) $ (24,326,785)
                                =============  =============


National Portfolio

Class B Shares for the Year                         Dollar
Ended June 30, 1995                   Shares        Amount

Shares sold                         8,878,807  $  87,072,076
Shares issued to shareholders
in reinvestment of dividends &
distributions                       1,612,526     15,637,171
                                -------------  -------------
Total issued                       10,491,333    102,709,247
Automatic conversion of shares         (2,817)       (44,533)
Shares redeemed                   (14,168,055)  (139,040,527)
                                -------------  -------------
Net decrease                       (3,679,539) $ (36,375,813)
                                =============  =============


National Portfolio

Class C Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                         1,026,234  $  10,483,940
Shares issued to shareholders
in reinvestment of dividends           22,712        231,247
                                -------------  -------------
Total issued                        1,048,946     10,715,187
Shares redeemed                      (252,941)    (2,580,645)
                                -------------  -------------
Net increase                          796,005  $   8,134,542
                                =============  =============


                                      75
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS (concluded)



National Portfolio

Class C Shares for the Period                       Dollar
October 21, 1994++ to June 30, 1995   Shares        Amount

Shares sold                           658,356  $   6,451,126
Shares issued to shareholders
in reinvestment of dividends &
distributions                           5,456         53,279
                                -------------  -------------
Total issued                          663,812      6,504,405
Shares redeemed                      (145,672)    (1,433,070)
                                -------------  -------------
Net increase                          518,140  $   5,071,335
                                =============  =============

[FN]
++Commencement of Operations.


National Portfolio

Class D Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                        13,624,624  $ 139,439,739
Automatic conversion of shares        175,315      1,776,371
Shares issued to shareholders
in reinvestment of dividends           74,448        759,889
                                -------------  -------------
Total issued                       13,874,387    141,975,999
Shares redeemed                   (11,497,765)  (118,306,764)
                                -------------  -------------
Net increase                        2,376,622  $  23,669,235
                                =============  =============


National Portfolio

Class D Shares for the Period                       Dollar
October 21, 1994++ to June 30, 1995   Shares        Amount

Shares sold                         5,900,638  $  57,599,450
Automatic conversion of shares          2,818         44,533
Shares issued to shareholders
in reinvestment of dividends &
distributions                          32,362        314,401
                                -------------  -------------
Total issued                        5,935,818     57,958,384
Shares redeemed                    (3,975,351)   (39,117,275)
                                -------------  -------------
Net increase                        1,960,467  $  18,841,109
                                =============  =============

[FN]
++Commencement of Operations.


Limited Maturity Portfolio

Class A Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                         2,286,543  $  22,746,544
Shares issued to shareholders
in reinvestment of dividends        1,098,806     10,929,822
                                -------------  -------------
Total issued                        3,385,349     33,676,366
Shares redeemed                   (15,364,211)  (152,811,221)
                                -------------  -------------
Net decrease                      (11,978,862) $(119,134,855)
                                =============  =============

Limited Maturity Portfolio

Class A Shares for the Year                         Dollar
Ended June 30, 1995                   Shares        Amount

Shares sold                         5,989,549  $  58,950,508
Shares issued to shareholders
in reinvestment of dividends        1,619,597     15,934,105
                                -------------  -------------
Total issued                        7,609,146     74,884,613
Shares redeemed                   (33,605,286)  (330,320,109)
                                -------------  -------------
Net decrease                      (25,996,140) $(255,435,496)
                                =============  =============


Limited Maturity Portfolio

Class B Shares for the Year                         Dollar
Ended June 30, 1996                   Shares        Amount

Shares sold                         1,855,378  $  18,448,441
Shares issued to shareholders
in reinvestment of dividends          196,945      1,959,129
                                -------------  -------------
Total issued                        2,052,323     20,407,570
Automatic conversion of shares         (1,991)       (19,792)
Shares redeemed                    (7,937,046)   (78,947,865)
                                -------------  -------------
Net decrease                       (5,886,714) $ (58,560,087)
                                =============  =============


                                      76
<PAGE>
 
Limited Maturity Portfolio

Class B Shares for the Year                                 Dollar
Ended June 30, 1995                       Shares            Amount

Shares sold                             8,960,577       $  88,112,911
Shares issued to shareholders
in reinvestment of dividends              364,664           3,587,539
                                 ----------------       -------------
Total issued                            9,325,241          91,700,450
Automatic conversion of shares               (447)             (4,387)
Shares redeemed                       (11,012,352)       (108,188,416)
                                 ----------------       -------------
Net decrease                           (1,687,558)      $ (16,492,353)
                                 ================       =============


Limited Maturity Portfolio

Class C Shares for the Year                                 Dollar
Ended June 30, 1996                       Shares            Amount

Shares sold                             1,035,202       $  10,296,541
Shares issued to shareholders
in reinvestment of dividends                1,535              15,247
                                 ----------------       -------------
Total issued                            1,036,737          10,311,788
Shares redeemed                        (1,426,909)        (14,189,010)
                                 ----------------       -------------
Net decrease                             (390,172)      $  (3,877,222)
                                 ================       =============


Limited Maturity Portfolio

Class C Shares for the Period
October 21, 1994++ to                                       Dollar
June 30, 1995                             Shares            Amount

Shares sold                             1,018,221       $  10,034,099
Shares issued to shareholders
in reinvestment of dividends                3,599              35,474
                                 ----------------       -------------
Total issued                            1,021,820          10,069,573
Shares redeemed                          (622,129)         (6,135,873)
                                 ----------------       -------------
Net increase                              399,691       $   3,933,700
                                 ================       =============

++Commencement of Operations.


Limited Maturity Portfolio

Class D Shares for the Year                                 Dollar
Ended June 30, 1996                       Shares            Amount

Shares sold                             5,319,786       $  52,931,793
Automatic conversion of shares              1,989              19,792
Shares issued to shareholders
in reinvestment of dividends               32,445             322,874
                                 ----------------       -------------
Total issued                            5,354,220          53,274,459
Shares redeemed                        (4,886,241)        (48,624,849)
                                 ----------------       -------------
Net increase                              467,979       $   4,649,610
                                 ================       =============


Limited Maturity Portfolio

Class D Shares for the Period                       Dollar
October 21, 1994++ to June 30, 1995   Shares        Amount

Shares sold                         2,889,627  $  28,392,515
Automatic conversion of shares            447          4,387
Shares issued to shareholders
in reinvestment of dividends           12,056        118,733
                                -------------  -------------
Total issued                        2,902,130     28,515,635
Shares redeemed                    (1,767,911)   (17,369,777)
                                -------------  -------------
Net increase                        1,134,219  $  11,145,858
                                =============  =============

[FN]
++Commencement of Operations.


5. Capital Loss Carryforward:
At June 30, 1996, the Fund had a net capital loss carryforward as follows:
Approximately $40,724,000 in the Insured Portfolio, of which $38,085,000 expires
in 2003 and $2,639,000 expires in 2004; approximately $66,385,000 in the
National Portfolio, of which $37,909,000 expires in 2003 and $28,476,000 expires
in 2004; and approximately $5,891,000 in the Limited Maturity Portfolio, of
which $1,036,000 expires in 1997, $2,787,000 expires in 1998, $22,000 expires in
1999, $25,000 expires in 2002 and $2,021,000 expires in 2003. These amounts will
be available to offset like amounts of any future taxable gains.



                                      77
<PAGE>
 
                      
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                                       78
<PAGE>
 
                      
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                                       79
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>   
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Investment Objective and Policies..........................................   2
 Insurance on Portfolio Securities.........................................   2
 Risk Factors In Transactions In Junk Bonds................................   2
 Transactions In Futures Contracts.........................................   4
Investment Restrictions....................................................   5
Management of the Fund.....................................................   7
 Directors and Officers....................................................   7
 Investment Advisory Arrangements..........................................   9
Determination of Net Asset Value...........................................  12
Portfolio Transactions.....................................................  13
Purchase of Shares.........................................................  14
 Alternative Sales Arrangements............................................  14
 Initial Sales Charge Alternatives--Class A and Class D Shares.............  14
 Reduced Initial Sales Charges--Class A and Class D Shares.................  15
 Distribution Plans........................................................  19
 Limitations on the Payment of Deferred Sales Charges......................  20
Redemption of Shares.......................................................  22
 Reinstatement Privilege...................................................  23
 Deferred Sales Charge--Class B and Class C Shares.........................  23
Dividends, Distributions and Taxes.........................................  24
Shareholder Services.......................................................  27
 Investment Account........................................................  27
 Automatic Investment Plans................................................  28
 Automatic Reinvestment of Dividends
  and Capital Gains Distributions..........................................  28
Systematic Withdrawal Plans................................................  28
Exchange Privilege.........................................................  29
Performance Data...........................................................  32
Additional Information.....................................................  36
 Description of Temporary Investments......................................  36
 Insurance on Portfolio Securities.........................................  36
 Description of Financial Futures Contracts................................  38
 Computation of Offering Price Per Share...................................  43
Independent Auditors' Report...............................................  44
Financial Statements.......................................................  46
</TABLE>    
                                                              
                                                           Code #10130-1096     
 
[LOGO] MERRILL LYNCH

Merrill Lynch
Municipal Bond Fund, Inc.

[ART]

STATEMENT OF 
ADDITIONAL 
INFORMATION

    
October 25, 1996     

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 ten year period ended
   June 30, 1996.     
 
   Contained in Part B:
      
    Schedules of Investments, as of June 30, 1996.     
      
    Statements of Assets and Liabilities, as of June 30, 1996.     
      
    Statements of Operations for the year ended June 30, 1996.     
      
    Statements of Changes in Net Assets for the years ended June 30, 1996
   and 1995.     
      
    Financial Highlights for each of the years in the five year period ended
   June 30, 1996.     
 
  (B) EXHIBITS:
 
     1. (a) Articles of Incorporation (incorporated by reference to Exhibit 1
  to Post-Effective Amendment No. 4 to Registrant's Registration Statement on
  Form N-1, filed October 31, 1980 (Post-Effective Amendment No. 4).
 
        (b) Articles of Amendment (incorporated by reference to Exhibit 1 to
  Post-Effective Amendment No. 13 to Registrant's Registration Statement on
  Form N-1A, filed October 12, 1988 (Post-Effective Amendment No. 13).
 
        (c) Articles Supplementary to the Articles of Incorporation
  increasing the authorized capital stock of the Insured Portfolio
  (incorporated by reference to Exhibit 1(c) to Post-Effective Amendment No.
  15 to Registrant's Registration Statement on Form N-1A, filed October 29,
  1990 (Post-Effective Amendment No. 15).
 
        (d) Articles Supplementary to the Articles of Incorporation
  establishing Class B Common Stock of Limited Maturity Portfolio
  (incorporated by reference to Exhibit 1(d) to Post-Effective Amendment No.
  16).
 
     2. By-Laws (incorporated by reference to Exhibit 2 to Post-Effective
  Amendment No. 13).
 
     3. Inapplicable.
 
     4. (a) Specimen certificates for Class A shares of Insured Portfolio
  Series and National Portfolio Series Common Stock of Registrant
  (incorporated by reference to Exhibit 4 to Post-Effective Amendment No.
  13).
 
        (b) Specimen certificates for Class B shares of Insured Portfolio
  Series and National Portfolio Series Common Stock of Registrant
  (incorporated by reference to Exhibit 4 to Post-Effective Amendment No.
  13).
 
                                      C-1
<PAGE>
 
        (c) Specimen certificates for Class A shares of Limited Maturity
  Portfolio Series Common Stock of Registrant (incorporated by reference to
  Exhibit 4 to Post-Effective Amendment No. 4).
 
     5. Advisory Agreement between Registrant and Fund Asset Management, Inc.
  (incorporated by reference to Exhibit 5 to Post-Effective Amendment No. 4).
 
     6. (a) Form of Amended Class A Distribution Agreement between Registrant
  and Merrill Lynch Funds Distributor, Inc. (including form of Selected
  Dealers Agreement).
 
        (b) Form of Class C Distribution Agreement between Registrant and
  Merrill Lynch Funds Distribution Inc. (including form of Selected Dealers
  Agreement, incorporated by reference to Exhibit 6 to Post-Effective
  Amendment No. 20).
 
        (c) Form of Class D Distribution Agreement between Registrant and
  Merrill Lynch Funds Distributor, Inc. (including form of Selected Dealers
  Agreement, incorporated by reference to Exhibit 6 to Post-Effective
  Amendment No. 20).
 
     7. Inapplicable.
 
     8. Custodian Agreement between Registrant and The Bank of New York
  (incorporated by reference to Exhibit 8 to Post-Effective Amendment No. 4).
 
     9. (a) Transfer Agency. Dividend Disbursing Agency and Shareholder
  Servicing Agency Agreement between Insured Portfolio of Registrant and
  Financial Data Services, Inc. (incorporated by reference to Exhibit 9 to
  Post-Effective Amendment No. 13).
 
        (b) Transfer Agency, Dividend Disbursing Agency and Shareholder
  Servicing Agency Agreement between National Portfolio of Registrant and
  Financial Data Services, Inc. (incorporated by reference to Exhibit 9 to
  Post-Effective Amendment No. 13).
 
        (c) Transfer Agency, Dividend Disbursing Agency and Shareholder
  Servicing Agency Agreement between Limited Maturity Portfolio of Registrant
  and Merrill Lynch Financial Data Services, Inc. (incorporated by reference
  to Post-Effective Amendment No. 13).
     
     10. Inapplicable.     
 
     11. Consent of Deloitte & Touche LLP (included herein).
 
     12. Inapplicable.
 
     13. (a) Letter from Fund Asset Management, Inc. with respect to the
  purchase of 10,257 shares of Registrant's Common Stock (incorporated by
  reference to Exhibit 13 to Post-Effective Amendment No. 3 to Registrant's
  Registration Statement on Form N-1, filed August 10, 1979).
 
         (b) Letter from Fund Asset Management, L.P. with respect to the
  purchase of shares of Registrant's Class C and Class D Common Stock of the
  Insured Portfolio (incorporated by reference to Exhibit 13 to Post-
  Effective Amendment No. 20).
 
         (c) Letter from Fund Asset Management, L.P. with respect to the
  purchase of shares of Registrant's Class C and Class D Common Stock of the
  National Portfolio (incorporated by reference to Exhibit 13 to Post-
  Effective Amendment No. 20).
 
                                      C-2
<PAGE>
 
         (d) Letter from Fund Asset Management, L.P. with respect to the
  purchase of shares of Registrant's Class C and Class D Common Stock of the
  Limited Maturity Portfolio (incorporated by reference to Exhibit 13 to
  Post-Effective Amendment No. 20).
 
     14. Inapplicable.
 
     15. (a) Amended and Restated Class B Distribution Plan of Registrant
  (including Class B Distribution Plan Sub-Agreement).
     
         (b) Form of Class C Distribution Plan of Registrant (including Class
  C Distribution Plan Sub-Agreement, incorporated by reference to Exhibit 15
  to Post-Effective Amendment No. 20).     
     
         (c) Form of Class D Distribution Plan of Registrant (including Class
  D Distribution Plan Sub-Agreement) (incorporated by reference to Exhibit 15
  to Post-Effective Amendment No. 20).     
 
     16. (a) Schedule for computation of each performance quotation for the
  Class B shares of the Insured Portfolio and National Portfolio provided in
  the Registration Statement in response to Item 22 (incorporated by
  reference to Exhibit 16 to Post-Effective Amendment No. 14 to Registrant's
  Registration Statement on Form N-1A, filed October 27, 1989).
 
         (b) Schedule for computation of each performance quotation for the
  Class A shares of the Insured Portfolio and National Portfolio and the
  shares of the Limited Maturity Portfolio provided in the Registration
  Statement in response to Item 22 (incorporated by reference to Exhibit 16
  to Post-Effective Amendment No. 13).
 
         (c) Schedule for computation of each performance quotation for the
  Class B shares of the Limited Maturity Portfolio provided in Registration
  Statement in response to Item 22 (incorporated by reference to Exhibit 16
  to Post Effective Amendment No. 14 to Registrant's Registration Statement
  on Form N-1A).
     
         (d) Schedule for computation of each performance quotation for the
  Class C shares of each Portfolio provided in the Registration Statement in
  response to Item 22 (incorporated by reference to Exhibit 16 to Post-
  Effective Amendment No. 20 to Registrant's Registration Statement on Form
  N-1A).     
     
         (e) Schedule for computation of each performance quotation for the
  Class D shares of each Portfolio provided in the Registration Statement in
  response to Item 22. (incorporated by reference to Exhibit 16 to Post-
  Effective Amendment No. 20 to Registrant's Registration Statement on Form
  N-1A).     
 
     17. (a) Financial Data Schedule for each class of shares of the National
  Portfolio.
 
         (b) Financial Data Schedule for each class of shares of the Insured
  Portfolio.
 
         (c) Financial Data Schedule for each class of shares of the Limited
  Maturity Portfolio.
 
ITEM 25.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT.
 
  Inapplicable.
 
                                      C-3
<PAGE>
 
ITEM 26.  NUMBER OF HOLDERS OF SECURITIES.
 
<TABLE>   
<CAPTION>
                                                                  NUMBER OF
                                                                  HOLDERS AT
                             TITLE OF CLASS                   SEPTEMBER 30, 1996
                             --------------                   ------------------
 <C>                         <S>                              <C>
 Insured Portfolio Series--  Class A Common Stock...........        28,766
                             Class B Common Stock...........        22,123
                             Class C Common Stock...........           967
                             Class D Common Stock...........           824
 National Portfolio Se-
  ries--                     Class A Common Stock...........        22,191
                             Class B Common Stock...........        12,564
                             Class C Common Stock...........           497
                             Class D Common Stock...........           670
 Limited Maturity Portfo-
  lio--                      Class A Common Stock...........         5,886
                             Class B Common Stock...........         1,797
                             Class C Common Stock...........            13
                             Class D Common Stock...........           174
</TABLE>    
   
Note: The number of holders shown in the table above includes holders of record
    plus beneficial owners whose shares are held of record by Merrill Lynch,
    Pierce, Fenner & Smith Incorporated.     
 
ITEM 27.  INDEMNIFICATION.
 
 
  Reference is made to Article VI of Registrant's Articles of Incorporation,
Article VI of Registrant's By-Laws, Section 2-418 of the Maryland General
Corporation Law and Section 9 of the Distribution Agreement.
 
ITEM 28.  BUSINESS AND OTHER CONNECTIONS OF MANAGER.
   
  Merrill Lynch Asset Management, L.P. (the "Manager" or "MLAM"), acts as
investment adviser for the following open-end 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 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
Holdings, 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 Institutional Intermediate 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 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., and Merrill
Lynch Variable Series Funds, Inc.; and the following closed-end investment
companies: Convertible Holdings, Inc., Merrill     
 
                                      C-4
<PAGE>
 
   
Lynch High Income Municipal Bond Fund, Inc., Merrill Lynch Senior Floating Rate
Fund, Inc. and Merrill Lynch Municipal Strategy Fund, Inc. Fund Asset
Management, L.P. ("FAM"), an affiliate of MLAM, acts as the investment adviser
for the following open-end 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 investment companies: Apex Municipal Fund, Inc.,
Corporate High Yield Fund, Inc., Corporate High Yield Fund II, Inc., Income
Opportunities Fund 1999, Inc., Income Opportunities Fund 2000, Inc., MuniAssets
Fund, Inc., MuniEnhanced Fund, Inc., MuniInsured Fund, Inc., MuniVest Fund,
Inc., MuniVest California Insured Fund, Inc., MuniVest Florida Fund, MuniVest
Michigan Insured Fund, Inc., MuniVest New Jersey Fund, Inc., MuniVest New York
Insured 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 Insured Fund II, 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 New York Insured Fund III, Inc.,
MuniYield Pennsylvania Fund, MuniYield Quality Fund, Inc., MuniYield Quality
Fund II, Inc., Senior High Income Portfolio, Inc., Taurus MuniCalifornia
Holdings, Inc., Taurus MuniNew York Holdings, Inc. and Worldwide DollarVest
Fund, Inc. The address of each of these investment companies is P.O. Box 9011,
Princeton, New Jersey 08543-9011. The address of Merrill Lynch Funds for
Institutions Series and Merrill Lynch Institutional Intermediate Fund is One
Financial Center, 15th Floor, Boston, Massachusetts 02111-2646. The address of
the Manager and FAM is also P.O. Box 9011, Princeton, New Jersey 08543-9011.
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 Merrill
Lynch Financial Data Services, Inc. ("FDS") is 4800 Deer Lake Drive East,
Jacksonville, Florida 32246-6484.     
 
  Set forth below is a list of each executive officer and partner of the
Investment Adviser indicating each business, profession, vocation or employment
of a substantial nature in which each such person or entity has been engaged
since April 1, 1993 for his or her 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 all or
substantially all of the investment companies described in the preceding
paragraph and Messrs. Giordano, Harvey, Hewitt, Kirstein and Monagle are
directors or officers of one or more of such companies. Messrs. Zeikel, Glenn
and Richard also hold the same positions with all or substantially all of the
investment companies advised by MLAM as they do with the Investment Adviser.
Messrs. Giordano, Harvey, Hewitt, Kirstein and Monagle are directors or
officers of one or more of such companies.
 
                                      C-5
<PAGE>
 
<TABLE>   
<CAPTION>
                                                           OTHER SUBSTANTIAL BUSINESS,
                                    POSITION WITH              PROFESSION, VOCATION
             NAME                 INVESTMENT ADVISER              OR EMPLOYMENT
             ----                 ------------------       ---------------------------
 <C>                           <C>                      <S>
 ML&Co. .....................  Limited Partner          Financial Services Holding
                                                        Company; Limited Partner of MLAM.
 Princeton Services, Inc.
  ("Princeton Services").....  General Partner          General Partner of MLAM.
 
 Fund Asset Management,        
  Inc........................  Limited Partner          Investment Advisory Services
 
 Arthur Zeikel...............  President and Director   President of MLAM; President and
                                                        Director of Princeton Services;
                                                        Executive Vice President of ML &
                                                        Co. and Merrill Lynch; Director
                                                        of MLFD.
 Terry K. Glenn..............  Executive Vice President Executive Vice President of MLAM;
                                                        Executive Vice President and
                                                        Director of Princeton Services;
                                                        President and Director of MLFD;
                                                        Director of Merrill Lynch
                                                        Financial Data Services, Inc.
                                                        ("FDS"); President of Princeton
                                                        Administrators, L.P.
 Robert W. Crook.............  Senior Vice President    Senior Vice President of MLFD
                                                        since 1990; Vice President of
                                                        MLFD from 1978 to 1990 and Vice
                                                        President of Investment Adviser
                                                        from 1981 to 1990.
 Vincent R. Giordano.........  Senior Vice President    Senior Vice President of MLAM;
                                                        Senior Vice President of
                                                        Princeton Services.
 Elizabeth Griffin...........  Senior Vice President    Senior Vice President of MLAM;
                                                        Senior Vice President of
                                                        Princeton Services.
 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.
 N. John Hewitt..............  Senior Vice President    Senior Vice President of MLAM;
                                                        Senior Vice President of
                                                        Princeton Services.
</TABLE>    
       
                                      C-6
<PAGE>
 
<TABLE>   
<CAPTION>
                                                         OTHER SUBSTANTIAL BUSINESS,
                                   POSITION WITH             PROFESSION, VOCATION
             NAME                INVESTMENT ADVISER             OR EMPLOYMENT
             ----                ------------------      ---------------------------
 <C>                           <C>                    <S>
 Philip L. Kirstein..........  Senior Vice President, Senior Vice President, General
                               General Counsel and    Counsel and Secretary of MLAM;
                               Secretary              Senior Vice President, General
                                                      Counsel, Director and Secretary
                                                      of Princeton Services; Director
                                                      of MLFD.
 Ronald M. Kloss.............  Senior Vice President  Senior Vice President and
                               and Controller         Controller of MLAM; Senior Vice
                                                      President and Controller of
                                                      Princeton Services.
 Stephen M.M. Miller.........  Senior Vice President  Executive Vice President of
                                                      Princeton Administrators, L.P.;
                                                      Senior Vice President of
                                                      Princeton Services.
 Joseph T. Monagle...........  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.
 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.
 Ronald L. Welburn...........  Senior Vice President  Senior Vice President of MLAM;
                                                      Senior Vice President of
                                                      Princeton Services.
 Anthony Wiseman.............  Senior Vice President  Senior Vice President of MLAM;
                                                      Senior Vice President of
                                                      Princeton Services.
</TABLE>    
 
ITEM 29.  PRINCIPAL UNDERWRITERS.
 
  (a) Merrill Lynch Funds Distributor, Inc. ("MLFD") acts as the principal
underwriter for the Registrant. MLFD acts as the principal underwriter for each
of the open-end investment companies referred to in Item 28, except CMA Money
Fund, CMA Government Securities Fund, CMA Tax-Exempt Fund, CBA Money Fund, CMA
Multi-State Municipal Series Trust, CMA Treasury Fund, The Corporate Fund
 
                                      C-7
<PAGE>
 
Accumulation Program, Inc., The Municipal Fund Accumulation Program, Inc., and
also acts as principal underwriter for the following closed-end funds: Merrill
Lynch High Income Municipal Bond Fund, Inc. and Merrill Lynch Senior Floating
Rate Fund, Inc.
   
  (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 9081,
Princeton, New Jersey 08543-9081, except that the address of Messrs. Crook,
Aldrich, Breen, Brady, Fatseas and Wasel is One Financial Center, 23rd Floor,
Boston, Massachusetts 02111-2665.     
 
<TABLE>   
<CAPTION>
                              POSITIONS AND OFFICES      POSITIONS AND OFFICES
           NAME                  WITH UNDERWRITER           WITH REGISTRANT
           ----            ---------------------------- ------------------------
<S>                        <C>                          <C>
Terry K. Glenn............ President                    Executive Vice President
Arthur Zeikel............. Director                     President and Director
Philip Kirstein........... Director                     None
William E. Aldrich........ Senior Vice President        None
Robert W. Crook........... Senior Vice President        None
Gerald M. Richard......... Vice President and Treasurer Treasurer
Kevin P. Boman............ Vice President               None
Michael J. Brady.......... Vice President               None
William M. Breen.......... Vice President               None
Mark A. DeSario........... Vice President               None
James T. Fatseas.......... Vice President               None
Debra W. Landsman-Yaros... Vice President               None
Michelle T. Lau........... Vice President               None
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 will be maintained at the offices of the Registrant, 800 Scudders
Mill Road, Plainsboro, New Jersey 08536, and MLFDS, 4800 Deer Lake Drive East,
Jacksonville, Florida 32246-6484.
 
ITEM 31.  MANAGEMENT SERVICES.
 
  Other than as set forth under the caption "Management of the Fund--Investment
Adviser" in the Prospectus constituting Part A of the Registration Statement
and under the caption "Management of the Funds--Investment Advisory
Arrangements" in the Statement of Additional Information constituting Part B of
the Registration Statement, Registrant is not a party to any management-related
services 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-8
<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 THIS POST-EFFECTIVE AMENDMENT TO ITS REGISTRATION STATEMENT
PURSUANT TO RULE 485(B) UNDER THE SECURITIES ACT OF 1933 AND HAS DULY CAUSED
THIS AMENDMENT TO ITS REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE
UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE TOWNSHIP OF PLAINSBORO AND STATE
OF NEW JERSEY ON THE 25TH DAY OF OCTOBER, 1996.     
 
                                          Merrill Lynch Municipal Bond Fund,
                                           Inc.
                                                      (REGISTRANT)
                                                  
                                               /s/ Gerald M. Richard     
                                          By: _________________________________
                                                
                                             GERALD M. RICHARD, TREASURER     
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS REGISTRATION
STATEMENT HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS IN THE CAPACITIES AND
ON THE DATE INDICATED.
 
              SIGNATURE                         TITLE                DATE
 
           Arthur Zeikel*                   President and
- -------------------------------------    Director (Principal
            ARTHUR ZEIKEL                Executive Officer)
                                                                          
     /s/ Gerald M. Richard*             Treasurer (Principal     October 25,
- -------------------------------------       Financial and         1996     
                                         Accounting Officer)
      (GERALD M. RICHARD)                                  
 
          Ronald W. Forbes*                   Director
- -------------------------------------
         (RONALD W. FORBES)
 
       Cynthia A. Montgomery*                 Director
- -------------------------------------
       (CYNTHIA A. MONTGOMERY)
 
         Charles C. Reilly*                   Director
- -------------------------------------
         (CHARLES C. REILLY)
 
           Kevin A. Ryan*                     Director
- -------------------------------------
           (KEVIN A. RYAN)
 
          Richard R. West*                    Director
- -------------------------------------
          (RICHARD R. WEST)
                                                                    
    /s/ Gerald M. Richard                                        October 25,
*By: ________________________________                             1996     
    
 GERALD M. RICHARD, ATTORNEY-IN-FACT
                    
                                      C-9
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
 EXHIBIT                                                                    PAGE
 NUMBER                             DESCRIPTION                             NO.
 -------                            -----------                             ----
 <C>     <S>                                                                <C>
  11     Consent of Deloitte & Touche LLP Independent Auditors...........
  17(a)  Financial Data Schedule for each class of shares of the National
          Portfolio......................................................
    (b)  Financial Data Schedule for each class of shares of the Insured
          Portfolio......................................................
    (c)  Financial Data Schedule for each class of shares of the Limited
          Maturity Portfolio.............................................
</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 OR 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> 1
   <NAME> MERRILL LYNCH MUNICIPAL BOND FUND -- NATIONAL PORTFOLIO -- CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                       1331509628
<INVESTMENTS-AT-VALUE>                      1403759064
<RECEIVABLES>                                 41495620
<ASSETS-OTHER>                                  671752
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              1445926436
<PAYABLE-FOR-SECURITIES>                       1118400
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4742351
<TOTAL-LIABILITIES>                            5860751
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1445082887
<SHARES-COMMON-STOCK>                         97261338
<SHARES-COMMON-PRIOR>                        105686998
<ACCUMULATED-NII-CURRENT>                   (77266638)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      72249436
<NET-ASSETS>                                 983550131
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             95242010
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (11544600)
<NET-INVESTMENT-INCOME>                       83697410
<REALIZED-GAINS-CURRENT>                       3774748
<APPREC-INCREASE-CURRENT>                     10373235
<NET-CHANGE-FROM-OPS>                         97845393
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (60489070)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        1874548
<NUMBER-OF-SHARES-REDEEMED>                 (13151450)
<SHARES-REINVESTED>                            2851242
<NET-CHANGE-IN-ASSETS>                      (64157374)
<ACCUMULATED-NII-PRIOR>                     (77312474)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                   (3745999)
<GROSS-ADVISORY-FEES>                          7014416
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               11544600
<AVERAGE-NET-ASSETS>                        1029853941
<PER-SHARE-NAV-BEGIN>                            10.02
<PER-SHARE-NII>                                    .60
<PER-SHARE-GAIN-APPREC>                            .09
<PER-SHARE-DIVIDEND>                             (.60)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.11
<EXPENSE-RATIO>                                    .56
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 2
   <NAME> M/L MUNICIPAL BOND FUND - NATIONAL PORT. - CLASS B
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                       1331509628
<INVESTMENTS-AT-VALUE>                      1403759064
<RECEIVABLES>                                 41495620
<ASSETS-OTHER>                                  671752
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              1445926436
<PAYABLE-FOR-SECURITIES>                       1118400
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4742351
<TOTAL-LIABILITIES>                            5860751
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1445082887
<SHARES-COMMON-STOCK>                         39501944
<SHARES-COMMON-PRIOR>                         41903872
<ACCUMULATED-NII-CURRENT>                   (77266638)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      72249436
<NET-ASSETS>                                 399340242
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             95242010
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (11544600)
<NET-INVESTMENT-INCOME>                       83697410
<REALIZED-GAINS-CURRENT>                       3774748
<APPREC-INCREASE-CURRENT>                     10373235
<NET-CHANGE-FROM-OPS>                         97845393
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (20995504)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        6798097
<NUMBER-OF-SHARES-REDEEMED>                 (10164859)
<SHARES-REINVESTED>                             964834
<NET-CHANGE-IN-ASSETS>                      (64157374)
<ACCUMULATED-NII-PRIOR>                     (77312474)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                   (3745999)
<GROSS-ADVISORY-FEES>                          7014416
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               11544600
<AVERAGE-NET-ASSETS>                         410215493
<PER-SHARE-NAV-BEGIN>                            10.02
<PER-SHARE-NII>                                    .52
<PER-SHARE-GAIN-APPREC>                            .09
<PER-SHARE-DIVIDEND>                             (.52)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.11
<EXPENSE-RATIO>                                   1.32
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 3
   <NAME> MERRILL LYNCH MUNICIPAL BOND FUND -- NATIONAL PORTFOLIO -- CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                       1331509628
<INVESTMENTS-AT-VALUE>                      1403759064
<RECEIVABLES>                                 41495620
<ASSETS-OTHER>                                  671752
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              1445926436
<PAYABLE-FOR-SECURITIES>                       1118400
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4742351
<TOTAL-LIABILITIES>                            5860751
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1445082887
<SHARES-COMMON-STOCK>                          1314145
<SHARES-COMMON-PRIOR>                           518140
<ACCUMULATED-NII-CURRENT>                   (77266638)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      72249436
<NET-ASSETS>                                  13291171
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             95242010
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (11544600)
<NET-INVESTMENT-INCOME>                       83697410
<REALIZED-GAINS-CURRENT>                       3774748
<APPREC-INCREASE-CURRENT>                     10373235
<NET-CHANGE-FROM-OPS>                         97845393
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (462078)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        1026234
<NUMBER-OF-SHARES-REDEEMED>                   (252941)
<SHARES-REINVESTED>                              22712
<NET-CHANGE-IN-ASSETS>                      (64157374)
<ACCUMULATED-NII-PRIOR>                     (77312474)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                   (3745999)
<GROSS-ADVISORY-FEES>                          7014416
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               11544600
<AVERAGE-NET-ASSETS>                           9114361
<PER-SHARE-NAV-BEGIN>                            10.03
<PER-SHARE-NII>                                    .52
<PER-SHARE-GAIN-APPREC>                            .08
<PER-SHARE-DIVIDEND>                             (.52)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.11
<EXPENSE-RATIO>                                   1.37
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 4
   <NAME> MERRILL LYNCH MUNICIPAL BOND FUND -- NATIONAL PORTFOLIO -- CLASS D
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                       1331509628
<INVESTMENTS-AT-VALUE>                      1403759064
<RECEIVABLES>                                 41495620
<ASSETS-OTHER>                                  671752
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              1445926436
<PAYABLE-FOR-SECURITIES>                       1118400
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4742351
<TOTAL-LIABILITIES>                            5860751
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1445082887
<SHARES-COMMON-STOCK>                          4337089
<SHARES-COMMON-PRIOR>                          1960467
<ACCUMULATED-NII-CURRENT>                   (77266638)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      72249436
<NET-ASSETS>                                  43884141
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             95242010
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (11544600)
<NET-INVESTMENT-INCOME>                       83697410
<REALIZED-GAINS-CURRENT>                       3774748
<APPREC-INCREASE-CURRENT>                     10373235
<NET-CHANGE-FROM-OPS>                         97845393
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (1750758)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                       13799939
<NUMBER-OF-SHARES-REDEEMED>                 (11497765)
<SHARES-REINVESTED>                              74448
<NET-CHANGE-IN-ASSETS>                      (64157374)
<ACCUMULATED-NII-PRIOR>                     (77312474)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                   (3745999)
<GROSS-ADVISORY-FEES>                          7014416
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               11544600
<AVERAGE-NET-ASSETS>                          31142976
<PER-SHARE-NAV-BEGIN>                            10.03
<PER-SHARE-NII>                                    .57
<PER-SHARE-GAIN-APPREC>                            .09
<PER-SHARE-DIVIDEND>                             (.57)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.12
<EXPENSE-RATIO>                                    .81
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 5
   <NAME> MERRILL LYNCH MUNICIPAL BOND FUND -- INSURED PORTFOLIO -- CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                       2271078486
<INVESTMENTS-AT-VALUE>                      2378216369
<RECEIVABLES>                                 44324681
<ASSETS-OTHER>                                28652506
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              2451193556
<PAYABLE-FOR-SECURITIES>                      77126436
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      7434200
<TOTAL-LIABILITIES>                           84560636
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    2301477527
<SHARES-COMMON-STOCK>                        198801419
<SHARES-COMMON-PRIOR>                        215373913
<ACCUMULATED-NII-CURRENT>                   (41982490)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     107137883
<NET-ASSETS>                                1572834522
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            147630923
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (16545150)
<NET-INVESTMENT-INCOME>                      131085773
<REALIZED-GAINS-CURRENT>                     (3897219)
<APPREC-INCREASE-CURRENT>                      3149618
<NET-CHANGE-FROM-OPS>                        130338172
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (92116281)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        5469354
<NUMBER-OF-SHARES-REDEEMED>                 (27028706)
<SHARES-REINVESTED>                            4986858
<NET-CHANGE-IN-ASSETS>                     (155950787)
<ACCUMULATED-NII-PRIOR>                     (38085734)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          8850984
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               16545150
<AVERAGE-NET-ASSETS>                        1663437621
<PER-SHARE-NAV-BEGIN>                             7.92
<PER-SHARE-NII>                                    .44
<PER-SHARE-GAIN-APPREC>                          (.01)
<PER-SHARE-DIVIDEND>                             (.44)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.91
<EXPENSE-RATIO>                                    .43
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 6
   <NAME> MERRILL LYNCH MUNICIPAL BOND FUND -- INSURED PORTFOLIO -- CLASS B
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                       2271078486
<INVESTMENTS-AT-VALUE>                      2378216369
<RECEIVABLES>                                 44324681
<ASSETS-OTHER>                                28652506
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              2451193556
<PAYABLE-FOR-SECURITIES>                      77126436
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      7434200
<TOTAL-LIABILITIES>                           84560636
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    2301477527
<SHARES-COMMON-STOCK>                         91463092
<SHARES-COMMON-PRIOR>                         98884919
<ACCUMULATED-NII-CURRENT>                   (41982490)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     107137883
<NET-ASSETS>                                 723089463
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            147630923
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (16545150)
<NET-INVESTMENT-INCOME>                      131085773
<REALIZED-GAINS-CURRENT>                     (3897219)
<APPREC-INCREASE-CURRENT>                      3149618
<NET-CHANGE-FROM-OPS>                        130338172
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (36347050)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                       13419351
<NUMBER-OF-SHARES-REDEEMED>                 (23187300)
<SHARES-REINVESTED>                            2346122
<NET-CHANGE-IN-ASSETS>                     (155950787)
<ACCUMULATED-NII-PRIOR>                     (38085734)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          8850984
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               16545150
<AVERAGE-NET-ASSETS>                         760018401
<PER-SHARE-NAV-BEGIN>                             7.92
<PER-SHARE-NII>                                    .38
<PER-SHARE-GAIN-APPREC>                          (.01)
<PER-SHARE-DIVIDEND>                             (.38)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.91
<EXPENSE-RATIO>                                   1.19
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 7
   <NAME> M/L MUNICIPAL BOND FUND - INSURED PORT. - CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                       2271078486
<INVESTMENTS-AT-VALUE>                      2378216369
<RECEIVABLES>                                 44324681
<ASSETS-OTHER>                                28652506
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              2451193556
<PAYABLE-FOR-SECURITIES>                      77126436
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      7434200
<TOTAL-LIABILITIES>                           84560636
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    2301477527
<SHARES-COMMON-STOCK>                          2394049
<SHARES-COMMON-PRIOR>                           979281
<ACCUMULATED-NII-CURRENT>                   (41982490)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     107137883
<NET-ASSETS>                                  18936443
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            147630923
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (16545150)
<NET-INVESTMENT-INCOME>                      131085773
<REALIZED-GAINS-CURRENT>                     (3897219)
<APPREC-INCREASE-CURRENT>                      3149618
<NET-CHANGE-FROM-OPS>                        130338172
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (626972)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        1893607
<NUMBER-OF-SHARES-REDEEMED>                   (532614)
<SHARES-REINVESTED>                              53775
<NET-CHANGE-IN-ASSETS>                     (155950787)
<ACCUMULATED-NII-PRIOR>                     (38085734)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          8850984
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               16545150
<AVERAGE-NET-ASSETS>                          13242995
<PER-SHARE-NAV-BEGIN>                             7.92
<PER-SHARE-NII>                                    .38
<PER-SHARE-GAIN-APPREC>                          (.01)
<PER-SHARE-DIVIDEND>                             (.38)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.91
<EXPENSE-RATIO>                                   1.24
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 8
   <NAME> MERRILL LYNCH MUNICIPAL BOND FUND -- INSURED PORTFOLIO -- CLASS D
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                       2271078486
<INVESTMENTS-AT-VALUE>                      2378216369
<RECEIVABLES>                                 44324681
<ASSETS-OTHER>                                28652506
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              2451193556
<PAYABLE-FOR-SECURITIES>                      77126436
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      7434200
<TOTAL-LIABILITIES>                           84560636
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    2301477527
<SHARES-COMMON-STOCK>                          6544245
<SHARES-COMMON-PRIOR>                          3283048
<ACCUMULATED-NII-CURRENT>                   (41982490)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     107137883
<NET-ASSETS>                                  51772492
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            147630923
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              (16545150)
<NET-INVESTMENT-INCOME>                      131085773
<REALIZED-GAINS-CURRENT>                     (3897219)
<APPREC-INCREASE-CURRENT>                      3149618
<NET-CHANGE-FROM-OPS>                        130338172
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (1995470)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                       15324323
<NUMBER-OF-SHARES-REDEEMED>                 (12181923)
<SHARES-REINVESTED>                             118797
<NET-CHANGE-IN-ASSETS>                     (155950787)
<ACCUMULATED-NII-PRIOR>                     (38085734)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          8850984
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               16545150
<AVERAGE-NET-ASSETS>                          37694634
<PER-SHARE-NAV-BEGIN>                             7.92
<PER-SHARE-NII>                                    .42
<PER-SHARE-GAIN-APPREC>                          (.01)
<PER-SHARE-DIVIDEND>                             (.42)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.91
<EXPENSE-RATIO>                                    .68
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 9
   <NAME> M/L MUNICIPAL BOND FUND - LTD. MATURITY PORT. - CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                        496214393
<INVESTMENTS-AT-VALUE>                       497510898
<RECEIVABLES>                                  8797596
<ASSETS-OTHER>                                  123368
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               506431862
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      2280248
<TOTAL-LIABILITIES>                            2280248
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     508487233
<SHARES-COMMON-STOCK>                         42089848
<SHARES-COMMON-PRIOR>                         54068710
<ACCUMULATED-NII-CURRENT>                    (5632124)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       1296505
<NET-ASSETS>                                 417097299
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             24596058
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (2884926)
<NET-INVESTMENT-INCOME>                       21711132
<REALIZED-GAINS-CURRENT>                       1322566
<APPREC-INCREASE-CURRENT>                    (1526762)
<NET-CHANGE-FROM-OPS>                         21506936
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (18019083)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        2286543
<NUMBER-OF-SHARES-REDEEMED>                 (15364211)
<SHARES-REINVESTED>                            1098806
<NET-CHANGE-IN-ASSETS>                     (177126750)
<ACCUMULATED-NII-PRIOR>                      (6954744)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          1899352
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                2884926
<AVERAGE-NET-ASSETS>                         472257549
<PER-SHARE-NAV-BEGIN>                             9.92
<PER-SHARE-NII>                                    .38
<PER-SHARE-GAIN-APPREC>                          (.01)
<PER-SHARE-DIVIDEND>                             (.38)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.91
<EXPENSE-RATIO>                                    .44
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER> 10
   <NAME> MERRILL LYNCH MUNICIPAL BOND FUND -- LIMITED MATURITY PORTFOLIO --
          CLASS B
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                        496214393
<INVESTMENTS-AT-VALUE>                       497510898
<RECEIVABLES>                                  8797596
<ASSETS-OTHER>                                  123368
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               506431862
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      2280248
<TOTAL-LIABILITIES>                            2280248
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     508487233
<SHARES-COMMON-STOCK>                          7170644
<SHARES-COMMON-PRIOR>                         13057358
<ACCUMULATED-NII-CURRENT>                    (5632124)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       1296505
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<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             24596058
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (2884926)
<NET-INVESTMENT-INCOME>                       21711132
<REALIZED-GAINS-CURRENT>                       1322566
<APPREC-INCREASE-CURRENT>                    (1526762)
<NET-CHANGE-FROM-OPS>                         21506936
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (3055609)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        1855378
<NUMBER-OF-SHARES-REDEEMED>                  (7939037)
<SHARES-REINVESTED>                             196945
<NET-CHANGE-IN-ASSETS>                     (177126750)
<ACCUMULATED-NII-PRIOR>                      (6954744)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          1899352
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                2884926
<AVERAGE-NET-ASSETS>                          88474679
<PER-SHARE-NAV-BEGIN>                             9.92
<PER-SHARE-NII>                                    .35
<PER-SHARE-GAIN-APPREC>                          (.01)
<PER-SHARE-DIVIDEND>                             (.35)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.91
<EXPENSE-RATIO>                                    .80
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<SERIES>
   <NUMBER>11
   <NAME> M/L MUNICIPAL BOND FUND-LTD. MATURITY PORT.-CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                        496214393
<INVESTMENTS-AT-VALUE>                       497510898
<RECEIVABLES>                                  8797596
<ASSETS-OTHER>                                  123368
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               506431862
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      2280248
<TOTAL-LIABILITIES>                            2280248
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     508487233
<SHARES-COMMON-STOCK>                             9519
<SHARES-COMMON-PRIOR>                           399691
<ACCUMULATED-NII-CURRENT>                    (5632124)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       1296505
<NET-ASSETS>                                     94043
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             24596058
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (2884926)
<NET-INVESTMENT-INCOME>                       21711132
<REALIZED-GAINS-CURRENT>                       1322566
<APPREC-INCREASE-CURRENT>                    (1526762)
<NET-CHANGE-FROM-OPS>                         21506936
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (25939)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        1035202
<NUMBER-OF-SHARES-REDEEMED>                  (1426909)
<SHARES-REINVESTED>                               1535
<NET-CHANGE-IN-ASSETS>                     (177126750)
<ACCUMULATED-NII-PRIOR>                      (6954744)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          1899352
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                2884926
<AVERAGE-NET-ASSETS>                            762063
<PER-SHARE-NAV-BEGIN>                             9.92
<PER-SHARE-NII>                                    .34
<PER-SHARE-GAIN-APPREC>                          (.04)
<PER-SHARE-DIVIDEND>                             (.34)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.88
<EXPENSE-RATIO>                                    .80
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<PAGE>
 
[ARTICLE] 6
[NUMBER] 12
[NAME] M/L MUNICIPAL BOND FUND-LTD, MATURITY PORT-CLASS D
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   12-MOS
[FISCAL-YEAR-END]                          JUN-30-1996
[PERIOD-START]                             JUL-01-1995
[PERIOD-END]                               JUL-30-1996
[INVESTMENTS-AT-COST]                        496214393
[INVESTMENTS-AT-VALUE]                       497510898
[RECEIVABLES]                                  8797596
[ASSETS-OTHER]                                  123368
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                               506431862
[PAYABLE-FOR-SECURITIES]                             0
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                      2280248
[TOTAL-LIABILITIES]                            2280248
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                     508487233
[SHARES-COMMON-STOCK]                          1602198
[SHARES-COMMON-PRIOR]                          1134219
[ACCUMULATED-NII-CURRENT]                    (5632124)
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                              0
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                       1296505
[NET-ASSETS]                                  15885543
[DIVIDEND-INCOME]                                    0
[INTEREST-INCOME]                             24596058
[OTHER-INCOME]                                       0
[EXPENSES-NET]                               (2884926)
[NET-INVESTMENT-INCOME]                       21711132
[REALIZED-GAINS-CURRENT]                       1322566
[APPREC-INCREASE-CURRENT]                    (1526762)
[NET-CHANGE-FROM-OPS]                         21506936
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                     (610501)
[DISTRIBUTIONS-OF-GAINS]                             0
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                        5321775
[NUMBER-OF-SHARES-REDEEMED]                  (4886241)
[SHARES-REINVESTED]                              32445
[NET-CHANGE-IN-ASSETS]                     (177126750)
[ACCUMULATED-NII-PRIOR]                      (6954744)
[ACCUMULATED-GAINS-PRIOR]                            0
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                          1899352
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                2884926
[AVERAGE-NET-ASSETS]                          16518650
[PER-SHARE-NAV-BEGIN]                             9.93
[PER-SHARE-NII]                                    .37
[PER-SHARE-GAIN-APPREC]                          (.02)
[PER-SHARE-DIVIDEND]                             (.37)
[PER-SHARE-DISTRIBUTIONS]                            0
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                               9.91
[EXPENSE-RATIO]                                    .54
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>

<PAGE>
 
INDEPENDENT AUDITORS' CONSENT
 
Merrill Lynch Municipal Bond Fund, Inc.:
 
We consent to the use in Post-Effective Amendment No. 21 to Registration
Statement No. 2-57354 of our report dated August 15, 1996 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.
 
Deloitte & Touche LLP
Princeton, New Jersey
October 25, 1996


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