MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
485BPOS, 1999-02-25
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<PAGE>
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 25, 1999
 
                                                     REGISTRATION NOS.: 33-10363
 
                                                                        811-4917
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                ----------------
 
                                   FORM N-1A
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933                     /X/
                          PRE-EFFECTIVE AMENDMENT NO.                        / /
                        POST-EFFECTIVE AMENDMENT NO. 15                      /X/
                                     AND/OR
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940                                /X/
                                AMENDMENT NO. 16                             /X/
                               ------------------
 
              MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
                        (A MASSACHUSETTS BUSINESS TRUST)
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
 
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (212) 392-1600
 
                                BARRY FINK, ESQ.
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
 
                            ------------------------
 
                                    COPY TO:
                            DAVID M. BUTOWSKY, ESQ.
                             GORDON ALTMAN BUTOWSKY
                             WEITZEN SHALOV & WEIN
                              114 WEST 47TH STREET
                            NEW YORK, NEW YORK 10036
                                ----------------
 
                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
 As soon as practicable after this Post-Effective Amendment becomes effective.
 
 IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (CHECK APPROPRIATE BOX)
        ___ immediately upon filing pursuant to paragraph (b)
        _X_ on February 26, 1999 pursuant to paragraph (b)
        ___ 60 days after filing pursuant to paragraph (a)
        ___ on (date) pursuant to paragraph (a) of rule 485.
 
           AMENDING THE PROSPECTUS AND UPDATING FINANCIAL STATEMENTS
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
              MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
 
                             CROSS-REFERENCE SHEET
 
                                   FORM N-1A
 
<TABLE>
<CAPTION>
ITEM                                                     CAPTION
- ---------------------------------------  ---------------------------------------
<S>                                      <C>
PART A                                                 PROSPECTUS
 1.  ..................................  Cover Page; Back Cover
 2.  ..................................  Investment Objective: Principal
                                         Investment Strategies; Principal Risks;
                                          Past Performance
 3.  ..................................  Fees and Expenses
 4.  ..................................  Investment Objective; Additional
                                         Investment Strategy Information;
                                          Additional Risk Information
 5.  ..................................  Not Applicable
 6.  ..................................  Fund Management
 7.  ..................................  Pricing Fund Shares; How to Buy Shares;
                                         How to Exchange Shares; How to Sell
                                          Shares; Distributions; Tax
                                          Consequences
 8.  ..................................  Share Class Arrangements
 9.  ..................................  Financial Highlights
PART B                                     STATEMENT OF ADDITIONAL INFORMATION
    Information required to be included in Part B is set forth under the
appropriate caption in Part B of this Registration Statement.
 
PART C
    Information required to be included in Part C is set forth under the
appropriate item, so numbered, in Part C of this Registration Statement.
</TABLE>
<PAGE>
   
                                                 PROSPECTUS -  FEBRUARY 26, 1999
    
 
Morgan Stanley Dean Witter
                                                        FEDERAL SECURITIES TRUST
 
[COVER PHOTO]
 
                                     A MUTUAL FUND WHOSE INVESTMENT OBJECTIVE IS
                                                  A HIGH LEVEL OF CURRENT INCOME
 
   
  The Securities and Exchange Commission has not approved or disapproved these
           securities or passed upon the adequacy of this PROSPECTUS.
           Any representation to the contrary is a criminal offense.
    
<PAGE>
CONTENTS
 
   
<TABLE>
<S>                       <C>                                                           <C>
The Fund                  Investment Objective........................................                   1
                          Principal Investment Strategies.............................                   1
                          Principal Risks.............................................                   2
                          Past Performance............................................                   4
                          Fees and Expenses...........................................                   5
                          Additional Investment Strategy Information..................                   6
                          Additional Risk Information.................................                   6
                          Fund Management.............................................                   7
 
Shareholder Information   Pricing Fund Shares.........................................                   8
                          How to Buy Shares...........................................                   8
                          How to Exchange Shares......................................                  10
                          How to Sell Shares..........................................                  12
                          Distributions...............................................                  13
                          Tax Consequences............................................                  14
                          Share Class Arrangements....................................                  15
 
Financial Highlights      ............................................................                  22
 
Our Family of Funds       ............................................................   Inside Back Cover
 
                          THIS PROSPECTUS CONTAINS IMPORTANT INFORMATION ABOUT THE FUND.
                          PLEASE READ IT CAREFULLY AND KEEP IT FOR FUTURE REFERENCE.
</TABLE>
    
 
           FUND CATEGORY
           ---------------------------
       / /  Growth
       / /  Growth and Income
       /X/  INCOME
       / /  Money Market
<PAGE>
(Sidebar)
INCOME
An investment objective having the goal of selecting securities to pay out
income rather than rise in value.
(End Sidebar)
 
THE FUND
 
ICON                INVESTMENT OBJECTIVE
- --------------------------------------------------------------------------------
                    Morgan Stanley Dean Witter Federal Securities Trust (the
                    "Fund") is a mutual fund whose investment objective is a
                    high level of current income. There is no guarantee that the
                    Fund will achieve this objective.
 
ICON                PRINCIPAL INVESTMENT STRATEGIES
- --------------------------------------------------------------------------------
                    The Fund will normally invest at least 65% of its assets in
                    U.S. Government securities. In making investment decisions,
                    the Fund's "Investment Manager," Morgan Stanley Dean Witter
                    Advisors Inc., considers economic developments, interest
                    rate trends and other factors. The Fund is not limited as to
                    the maturities of the U.S. Government securities in which it
                    may invest.
 
                    U.S. GOVERNMENT SECURITIES. The U.S. Government securities
                    (including zero coupon securities) that the Fund may
                    purchase include:
 
                    - U.S. Treasury bills, notes and bonds, all of which are
                      direct obligations of the U.S. Government.
 
                    - Securities (including mortgage-backed securities) issued
                      by agencies and instrumentalities of the U.S. Government
                      which are backed by the full faith and credit of the
                      United States. Among the agencies and instrumentalities
                      issuing these obligations are the Government National
                      Mortgage Association and the Federal Housing
                      Administration.
 
                    - Securities (including mortgage-backed securities) issued
                      by agencies and instrumentalities which are not backed by
                      the full faith and credit of the United States, but whose
                      issuing agency or instrumentality has the right to borrow,
                      to meet its obligations, from U.S. Treasury. Among these
                      agencies and instrumentalities are the Federal National
                      Mortgage Association and the Federal Home Loan Mortgage
                      Corporation.
 
                    - Securities issued by agencies and instrumentalities which
                      are backed solely by the credit of the issuing agency or
                      instrumentality. Among these agencies and
                      instrumentalities are the Federal Farm Credit System and
                      the Federal Home Loan Banks.
 
                    MORTGAGE-BACKED SECURITIES. One type of mortgage-backed
                    security, in which the Fund may invest, is a mortgage
                    pass-through security. These securities represent a
                    participation interest in a pool of residential mortgage
                    loans originated by U.S. Governmental or private lenders
                    such as banks. They differ from conventional debt
                    securities, which provide for periodic payment of interest
                    in fixed amounts and principal payments at maturity or on
                    specified call dates. Mortgage pass-through securities
                    provide for monthly payments that are a "pass-through" of
                    the monthly interest and principal payments made by the
                    individual borrowers on the pooled mortgage loans. Mortgage
                    pass-through securities may be collateralized by mortgages
                    with fixed rates of interest or adjustable rates.
 
                                               * * *
 
                                                                               1
<PAGE>
   
                    In pursuing the Fund's investment objective, the Investment
                    Manager has considerable leeway in deciding which
                    investments it buys, holds or sells on a day-to-day basis --
                    and which trading strategies it uses. For example, the
                    Investment Manager in its discretion may determine to use
                    some permitted trading strategies while not using others. In
                    addition to the securities described above, the Fund may
                    also invest in options and futures.
    
 
ICON                PRINCIPAL RISKS
- --------------------------------------------------------------------------------
                    The Fund's share price will fluctuate with changes in the
                    market value of the Fund's portfolio securities. The Fund's
                    yield also will vary based on the yield of the Fund's
                    portfolio securities. Neither the value nor the yield of the
                    U.S. Government securities that the Fund invests in (or the
                    value or yield of the Fund's shares) is guaranteed by the
                    U.S. Government. When you sell Fund shares, they may be
                    worth less than what you paid for them and, accordingly, you
                    can lose money investing in this Fund.
 
                    U.S. GOVERNMENT SECURITIES. A principal risk of investing in
                    the Fund is associated with its U.S. Government securities,
                    which are fixed-income securities. All fixed-income
                    securities, such as bonds, are subject to two types of risk:
                    credit risk and interest rate risk. Credit risk refers to
                    the possibility that the issuer of a security will be unable
                    to make interest payments and/or repay the principal on its
                    debt.
 
   
                    Interest rate risk refers to fluctuations in the value of a
                    fixed-income security resulting from changes in the general
                    level of interest rates. When the general level of interest
                    rates goes up, the prices of most fixed-income securities go
                    down. When the general level of interest rates goes down,
                    the prices of most fixed-income securities go up. (Zero
                    coupon securities are typically subject to greater price
                    fluctuations than comparable securities that pay interest.)
                    As merely illustrative of the relationship between
                    fixed-income securities and interest rates, the following
                    table shows how interest rates affect bond prices.
    
 
   
<TABLE>
<CAPTION>
                                             PRICE PER $1,000 OF A BOND IF
                                                    INTEREST RATES:
                                         -------------------------------------
                                             INCREASE            DECREASE
HOW INTEREST RATES AFFECT BOND PRICES    -----------------   -----------------
- ----------------------------------------------------------
 BOND MATURITY                  COUPON     1%        2%        1%        2%
<S>                             <C>      <C>       <C>       <C>       <C>
- ------------------------------------------------------------------------------
 1 year                          N/A     $1,000    $1,000    $1,000    $1,000
- ------------------------------------------------------------------------------
 5 years                        4.25%     $967      $934     $1,038    $1,076
- ------------------------------------------------------------------------------
 10 years                       4.75%     $930      $867     $1,074    $1,155
- ------------------------------------------------------------------------------
 30 years                       5.25%     $865      $756     $1,166    $1,376
- ------------------------------------------------------------------------------
</TABLE>
    
 
   
                    Coupons reflect yields on Treasury securities as of December
                    31, 1998. The table is not representative of price changes
                    for mortgage-backed securities principally because of
                    prepayments. In addition, the table is an illustration and
                    does not represent expected yeilds or share price changes of
                    any Morgan Stanley Dean Witter mutual fund.
    
 
                    While the credit risk associated with U.S. Government
                    securities is minimal, the interest rate risk can be
                    substantial. The Fund is not limited as to the maturities of
                    the securities in which it may invest. Thus, a rise in the
                    general level of interest rates may cause the price of the
                    Fund's portfolio securities to fall substantially.
 
2
<PAGE>
                    MORTGAGE-BACKED SECURITIES. Mortgage-backed securities in
                    which the Fund may invest have different risk
                    characteristics than traditional debt securities. Although
                    generally the value of fixed-income securities increases
                    during periods of falling interest rates and decreases
                    during periods of rising rates, this is not always the case
                    with mortgage-backed securities. This is due to the fact
                    that principal on underlying mortgages may be prepaid at any
                    time as well as other factors. Generally, prepayments will
                    increase during a period of falling interest rates and
                    decrease during a period of rising interest rates. The rate
                    of prepayments also may be influenced by economic and other
                    factors. Prepayment risk includes the possibility that, as
                    interest rates fall, securities with stated interest rates
                    may have the principal prepaid earlier than expected,
                    requiring the Fund to invest the proceeds at generally lower
                    interest rates.
 
   
                    Investments in mortgage-backed securities are made based
                    upon, among other things, expectations regarding the rate of
                    prepayments on underlying mortgage pools. Rates of
                    prepayment, faster or slower than expected by the Investment
                    Manager, could reduce the Fund's yield, increase the
                    volatility of the Fund and/or cause a decline in net asset
                    value. Certain mortgage-backed securities may be more
                    volatile and less liquid than other traditional types of
                    debt securities.
    
 
   
                    OTHER RISKS. The performance of the Fund also will depend on
                    whether or not the Investment Manager is successful in
                    pursuing the Fund's investment strategy. The Fund is also
                    subject to other risks from its permissible investments
                    including the risks associated with its options and futures
                    investments. For more information about these risks, see the
                    "Additional Risk Information" section.
    
 
                    Shares of the Fund are not bank deposits and are not
                    guaranteed or insured by any bank, governmental entity, or
                    the FDIC.
 
                                                                               3
<PAGE>
(Sidebar)
ANNUAL TOTAL RETURNS
This chart shows how the performance of the Fund's Class B shares has varied
from year to year over a 10-year period.
   
AVERAGE ANNUAL
TOTAL RETURNS
This table compares the Fund's average annual returns with those of a broad
measure of market performance over time. The Fund's returns include the maximum
applicable sales charge for each Class and assume you sold your shares at the
end of each period.
    
(End Sidebar)
ICON                 PAST
                     PERFORMANCE
- --------------------------------------------------------------------------------
   
                          The bar chart and table below provide some indication
                          of the risks of investing in the Fund. The Fund's past
                          performance does not indicate how the Fund will
                          perform in the future.
    
                          ANNUAL TOTAL RETURNS -- CALENDAR YEARS
 
                          EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED
                          GRAPHIC
 
<TABLE>
<S>        <C>
1989          14.62%
90             7.07%
91            14.24%
92             6.47%
93             9.14%
94            -5.04%
95            18.76%
96             0.92%
97             8.94%
98             9.12%
</TABLE>
 
                    The bar chart reflects the performance of Class B shares;
                    the performance of the other Classes will differ because the
                    Classes have different ongoing fees. The performance
                    information in the bar chart does not reflect the deduction
                    of sales charges; if these amounts were reflected, returns
                    would be less than shown.
                    During the periods shown in the bar chart, the highest
                    return for a calendar quarter was 8.42% (quarter ended June
                    30, 1989) and the lowest return for a calendar quarter was
                    -4.02% (quarter ended March 31, 1994).
 
   
<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURNS (FOR THE PERIODS ENDED THE 1998 CALENDAR YEAR)
- -------------------------------------------------------------------------------
                                     PAST 1 YEAR   PAST 5 YEARS   PAST 10 YEARS
<S>                                  <C>           <C>            <C>
- -------------------------------------------------------------------------------
 Class A                                5.32%           --             --
- -------------------------------------------------------------------------------
 Class B(1)                             4.12%         5.92%           8.27%
- -------------------------------------------------------------------------------
 Class C                                8.09%           --             --
- -------------------------------------------------------------------------------
 Class D                                9.83%           --             --
- -------------------------------------------------------------------------------
 Lehman Brothers General U.S.
 Government Index(2)                    9.85%         7.18%           9.17%
- -------------------------------------------------------------------------------
 Lipper General U.S. Government
 Funds Index(3)                         7.85%         6.01%           7.92%
- -------------------------------------------------------------------------------
</TABLE>
    
 
   
1    Prior to July 28, 1997, the Fund only issued Class B shares.
2    The Lehman Brothers General U.S. Government Index is a broad-based measure
     of all U.S. Government and U.S. Treasury securities. The Index's total
     return does not include fees, expenses or charges. The Index is unmanaged
     and should not be considered an investment.
3    The Lipper General U.S. Government Funds Index is an equally-weighted
     performance index of the largest-qualifying funds (based on net assets) in
     the Lipper General U.S. Government Funds objective. The Index, which is
     adjusted for capital gains distributions and income dividends, is unmanaged
     and should not be considered an investment. There are currently 30 funds
     represented in the Index.
 
    
 
4
<PAGE>
(Sidebar)
SHAREHOLDER FEES
These fees are paid directly from your investment.
 
ANNUAL FUND
OPERATING EXPENSES
   
These expenses are deducted from the Fund's assets and are based on expenses
paid for the fiscal year ended October 31, 1998.
    
(End Sidebar)
 
ICON                FEES AND EXPENSES
- --------------------------------------------------------------------------------
   
                    The Fund offers four Classes of shares: Classes A, B, C and
                    D. Each Class has a different combination of fees, expenses
                    and other features. The table below briefly describes the
                    fees and expenses that you may pay if you buy and hold
                    shares of the Fund. The Fund does not charge account or
                    exchange fees. See the "Share Class Arrangements" section
                    for further fee and expense information.
    
 
<TABLE>
<CAPTION>
                                                              CLASS A   CLASS B   CLASS C   CLASS D
<S>                                                           <C>       <C>       <C>       <C>
- ---------------------------------------------------------------------------------------------------
 SHAREHOLDER FEES
- ---------------------------------------------------------------------------------------------------
 Maximum sales charge (load) imposed on purchases (as a
 percentage of offering price)                                  4.25%(1)  None     None      None
- ---------------------------------------------------------------------------------------------------
 Maximum deferred sales charge (load) (as a percentage based
 on the lesser of the offering price or net asset value at
 redemption)                                                  None(2)     5.00%(3)   1.00%(4)  None
- ---------------------------------------------------------------------------------------------------
 ANNUAL FUND OPERATING EXPENSES
- ---------------------------------------------------------------------------------------------------
 Management Fee                                                0.55%     0.55%     0.55%     0.55%
- ---------------------------------------------------------------------------------------------------
 Distribution and service (12b-1) fees                         0.24%     0.85%     0.85%     None
- ---------------------------------------------------------------------------------------------------
 Other expenses                                                0.14%     0.14%     0.14%     0.14%
- ---------------------------------------------------------------------------------------------------
 Total annual Fund operating expenses                          0.93%     1.54%     1.54%     0.69%
- ---------------------------------------------------------------------------------------------------
</TABLE>
 
1    Reduced for purchases of $25,000 and over.
2    Investments that are not subject to any sales charge at the time of
     purchase are subject to a contingent deferred sales charge ("CDSC") of
     1.00% that will be imposed on sales made within one year after purchase,
     except for certain specific circumstances.
3    The CDSC is scaled down to 1.00% during the sixth year, reaching zero
     thereafter. See "Share Class Arrangements" for a complete discussion of the
     CDSC.
4    Only applicable to sales made within one year after purchase.
 
                    EXAMPLE
   
                    This example is intended to help you compare the cost of
                    investing in the Fund with the cost of investing in other
                    mutual funds.
    
 
   
                    The example assumes that you invest $10,000 in the Fund,
                    your investment has a 5% return each year, and the Fund's
                    operating expenses remain the same. Although your actual
                    costs may be higher or lower, the tables below show your
                    costs at the end of each period based on these assumptions
                    depending upon whether or not you sell your shares at the
                    end of each period.
    
 
<TABLE>
<CAPTION>
                         IF YOU SOLD YOUR SHARES:                    IF YOU HELD YOUR SHARES:
                 -----------------------------------------   -----------------------------------------
                 1 YEAR    3 YEARS    5 YEARS    10 YEARS    1 YEAR    3 YEARS    5 YEARS    10 YEARS
<S>              <C>       <C>        <C>        <C>         <C>       <C>        <C>        <C>
- ----------------------------------------------------------   -----------------------------------------
 CLASS A           $516      $709      $   918     $1,519      $516      $709       $918       $1,519
- ----------------------------------------------------------   -----------------------------------------
 CLASS B           $657      $786      $ 1,039     $1,834      $157      $486       $839       $1,834
- ----------------------------------------------------------   -----------------------------------------
 CLASS C           $257      $486      $   839     $1,834      $157      $486       $839       $1,834
- ----------------------------------------------------------   -----------------------------------------
 CLASS D           $ 70      $221      $   384     $  859      $ 70      $221       $384       $  859
- ----------------------------------------------------------   -----------------------------------------
</TABLE>
 
                                                                               5
<PAGE>
ICON                ADDITIONAL INVESTMENT STRATEGY INFORMATION
- --------------------------------------------------------------------------------
   
                    This section provides additional information concerning the
                    Fund's principal investment strategies.
    
 
                    OTHER SECURITIES. The Fund also may invest up to 35% of its
                    assets in interest rate futures, options on these futures
                    contracts, and money market instruments. Options and futures
                    may be used to seek to protect against a decline in
                    securities prices from changes in prevailing interest rates
                    or an increase in prices of securities that may be
                    purchased.
 
   
                    DEFENSIVE INVESTING. The Fund may take temporary "defensive"
                    positions in attempting to respond to adverse market
                    conditions. The Fund may invest any amount of its assets in
                    cash or money market instruments in a defensive posture when
                    the Investment Manager believes it is advisable to do so.
                    Although taking a defensive posture is designed to protect
                    the Fund from an anticipated market downturn, it could have
                    the effect of reducing the benefit from any upswing in the
                    market.
    
 
   
                    The percentage limitations relating to the composition of
                    the Fund's portfolio apply at the time the Fund acquires an
                    investment. Subsequent percentage changes that result from
                    market fluctuations or changes in assets will not require
                    the Fund to sell any portfolio security. The Fund may change
                    its principal investment strategies without shareholder
                    approval; however, you would be notified of any changes.
    
 
ICON                ADDITIONAL RISK INFORMATION
- --------------------------------------------------------------------------------
                    As discussed in the "Principal Risks" section, a principal
                    risk of investing in the Fund is associated with its
                    fixed-income securities investments. This section provides
                    additional information regarding the principal risks of
                    investing in the Fund.
 
                    OPTIONS AND FUTURES. If the Fund invests in options and/or
                    futures, its participation in these markets would subject
                    the Fund's portfolio to certain risks. The Investment
                    Manager's predictions of movements in the direction of
                    interest rate movements may be inaccurate, and the adverse
                    consequences to the Fund (e.g., a reduction in the Fund's
                    net asset value or a reduction in the amount of income
                    available for distribution) may leave the Fund in a worse
                    position than if these strategies were not used. Other risks
                    inherent in the use of options and futures include, for
                    example, the possible imperfect correlation between the
                    price of options and futures contracts and movements in the
                    prices of the securities being hedged, and the possible
                    absence of a liquid secondary market for any particular
                    instrument.
 
                    YEAR 2000. The Fund could be adversely affected if the
                    computer systems necessary for the efficient operation of
                    the Investment Manager, the Fund's other service providers
                    and the markets and individual and governmental issuers in
                    which the Fund invests do not properly process and calculate
                    date-related information from and after January 1, 2000.
                    While year 2000-related computer problems could have a
                    negative effect on the Fund, the Investment Manager and
                    affiliates are working hard to avoid any problems and to
                    obtain assurances from their service providers that they are
                    taking similar steps.
 
6
<PAGE>
(Sidebar)
MORGAN STANLEY DEAN WITTER ADVISORS INC.
   
The Investment Manager is widely recognized as a leader in the mutual fund
industry and together with Morgan Stanley Dean Witter Services Company Inc., its
wholly-owned subsidiary, has more than $127 billion in assets under management
or administration as of January 31, 1999.
    
(End Sidebar)
 
ICON                FUND MANAGEMENT
- --------------------------------------------------------------------------------
                    The Fund has retained the Investment Manager -- Morgan
                    Stanley Dean Witter Advisors Inc. -- to provide
                    administrative services, manage its business affairs and
                    invest its assets, including the placing of orders for the
                    purchase and sale of portfolio securities. The Investment
                    Manager is a wholly-owned subsidiary of Morgan Stanley Dean
                    Witter & Co., a preeminent global financial services firm
                    that maintains leading market positions in each of its three
                    primary businesses: securities, asset management and credit
                    services. Its main business office is located at Two World
                    Trade Center, New York, New York 10048.
 
                    The Fund's portfolio is managed within the Investment
                    Manager's Taxable Fixed-Income Group. Rajesh K. Gupta, a
                    Senior Vice President of the Investment Manager, and Howard
                    A. Schloss, a Vice President of the Investment Manager, have
                    been the primary portfolio managers of the Fund since June,
                    1987 and February, 1999, respectively, and have been
                    portfolio managers with the Investment Manager for over five
                    years.
 
                    The Fund pays the Investment Manager a monthly management
                    fee as full compensation for the services and facilities
                    furnished to the Fund, and for Fund expenses assumed by the
                    Investment Manager. The fee is based on the Fund's average
                    daily net assets. For the fiscal year ended October 31,
                    1998, the Fund accrued total compensation to the Investment
                    Manager amounting to 0.55% of the Fund's average daily net
                    assets.
 
                                                                               7
<PAGE>
(Sidebar)
CONTACTING A FINANCIAL ADVISOR
   
If you are new to the Morgan Stanley Dean Witter Family of Funds and would like
to contact a Financial Advisor, call (800) THE-DEAN for the telephone number of
the Morgan Stanley Dean Witter office nearest you.
    
 
   
You may also access our office locator on our Internet site at:
    
www.deanwitter.com/funds
(End Sidebar)
 
SHAREHOLDER INFORMATION
 
ICON                PRICING FUND SHARES
- --------------------------------------------------------------------------------
                    The price of Fund shares (excluding sales charges), called
                    "net asset value," is based on the value of the Fund's
                    portfolio securities. While the assets of each Class are
                    invested in a single portfolio of securities, the net asset
                    value of each Class will differ because the Classes have
                    different ongoing distribution fees.
 
   
                    The net asset value per share of the Fund is determined once
                    daily at 4:00 p.m. Eastern time on each day that the New
                    York Stock Exchange is open (or, on days when the New York
                    Stock Exchange closes prior to 4:00 p.m., at such earlier
                    time). Shares will not be priced on days that the New York
                    Stock Exchange is closed.
    
 
                    The value of the Fund's portfolio securities is based on the
                    securities' market price when available. When a market price
                    is not readily available, including circumstances under
                    which the Investment Manager determines that a security's
                    market price is not accurate, a portfolio security is valued
                    at its fair value, as determined under procedures
                    established by the Fund's Board of Trustees. In these cases,
                    the Fund's net asset value will reflect certain portfolio
                    securities' fair value rather than their market price.
 
                    An exception to the Fund's general policy of using market
                    prices concerns its short-term debt portfolio securities.
                    Debt securities with remaining maturities of sixty days or
                    less at the time of purchase are valued at amortized cost.
                    However, if the cost does not reflect the securities' market
                    value, these securities will be valued at their fair value.
 
ICON                HOW TO BUY SHARES
- --------------------------------------------------------------------------------
   
                    You may open a new account to buy Fund shares or buy
                    additional Fund shares for an existing account by contacting
                    your Morgan Stanley Dean Witter Financial Advisor or other
                    authorized financial representative. Your Financial Advisor
                    will assist you, step-by-step, with the procedures to invest
                    in the Fund. You may also purchase shares directly by
                    calling the Fund's transfer agent and requesting an
                    application.
    
 
                    Because every investor has different immediate financial
                    needs and long-term investment goals, the Fund offers
                    investors four Classes of shares: Classes A, B, C and D.
                    Class D shares are only offered to a limited group of
                    investors. Each Class of shares offers a distinct structure
                    of sales charges, distribution and service fees, and other
                    features that are designed to address a variety of needs.
                    Your Financial Advisor or other authorized financial
                    representative can help you decide which Class may be most
                    appropriate for you. When purchasing Fund shares, you must
                    specify which Class of shares you wish to purchase.
 
   
                    When you buy Fund shares, the shares are purchased at the
                    next share price calculated (less any applicable front-end
                    sales charge for Class A shares) after we receive your
                    investment order in proper form. We reserve the right to
                    reject any order for the purchase of Fund shares.
    
 
8
<PAGE>
(Sidebar)
EASYINVEST-SM-
   
A purchase plan that allows you to transfer money automatically from your
checking or savings account or from a Money Market Fund on a semi-monthly,
monthly or quarterly basis. Contact your Morgan Stanley Dean Witter Financial
Advisor for further information about this service.
    
(End Sidebar)
 
   
<TABLE>
<CAPTION>
MINIMUM INVESTMENT AMOUNTS
- ------------------------------------------------------------------------------------------------
                                                                            MINIMUM INVESTMENT
                                                                          ----------------------
 INVESTMENT OPTIONS                                                       INITIAL    ADDITIONAL
<S>                                  <C>                                  <C>        <C>
- ------------------------------------------------------------------------------------------------
 Regular Accounts                                                          $ 1,000      $ 100
- ------------------------------------------------------------------------------------------------
 Individual Retirement Accounts:     Regular IRAs                          $ 1,000      $ 100
                                     Education IRAs                           $500      $ 100
- ------------------------------------------------------------------------------------------------
 EASYINVEST-SM-                      (automatically from your checking
                                     or savings account or Money Market
                                     Fund)                                   $100*      $ 100*
- ------------------------------------------------------------------------------------------------
</TABLE>
    
 
*    Provided your schedule of investments totals $1,000 in twelve months.
 
   
                    There is no minimum investment amount if you purchase Fund
                    shares through: (1) the Investment Manager's mutual fund
                    asset allocation plan, (2) a program, approved by the Fund's
                    distributor, in which you pay an asset-based fee for
                    advisory, administrative and/or brokerage services, or (3)
                    employer-sponsored employee benefit plan accounts.
    
 
                    INVESTMENT OPTIONS FOR CERTAIN INSTITUTIONAL AND OTHER
                    INVESTORS/CLASS D SHARES. To be eligible to purchase Class D
                    shares, you must qualify under one of the investor
                    categories specified in the "Share Class Arrangements"
                    section of this PROSPECTUS.
 
   
                    THREE DAY SETTLEMENT. Fund shares are sold through the
                    Fund's distributor, Morgan Stanley Dean Witter Distributors
                    Inc., on a normal three business day basis; that is, your
                    payment for Fund shares is due on the third business day
                    (settlement day) after you place a purchase order.
    
 
   
                    SUBSEQUENT INVESTMENTS SENT DIRECTLY TO THE FUND. In
                    addition to buying additional Fund shares for an existing
                    account by contacting your Morgan Stanley Dean Witter
                    Financial Advisor, you may send a check directly to the
                    Fund. To buy additional shares in this manner:
    
 
                    - Write a "letter of instruction" to the Fund specifying the
                      name(s) on the account, the account number, the social
                      security or tax identification number, the Class of shares
                      you wish to purchase and the investment amount (which
                      would include any applicable front-end sales charge). The
                      letter must be signed by the account owner(s).
 
                    - Make out a check for the total amount payable to: Morgan
                      Stanley Dean Witter Federal Securities Trust.
 
                    - Mail the letter and check to Morgan Stanley Dean Witter
                      Trust FSB at P.O. Box 1040, Jersey City, NJ 07303.
 
                                                                               9
<PAGE>
ICON                HOW TO EXCHANGE SHARES
- --------------------------------------------------------------------------------
   
                    PERMISSIBLE FUND EXCHANGES. You may exchange shares of any
                    Class of the Fund for the same Class of any other
                    continuously offered Multi-Class Fund, or for shares of a
                    No-Load Fund, Money Market Fund or Short-Term U.S. Treasury
                    Trust, without the imposition of an exchange fee. See the
                    inside back cover of this PROSPECTUS for each Morgan Stanley
                    Dean Witter Fund's designation as a Multi-Class Fund, No-
                    Load Fund or Money Market Fund. If a Morgan Stanley Dean
                    Witter Fund is not listed, consult the inside back cover of
                    that Fund's PROSPECTUS for its designation. For purposes of
                    exchanges, shares of FSC Funds (subject to a front-end sales
                    charge) are treated as Class A shares of a Multi-Class Fund.
    
 
   
                    Exchanges may be made after shares of the Fund acquired by
                    purchase have been held for thirty days. There is no waiting
                    period for exchanges of shares acquired by exchange or
                    dividend reinvestment. The current PROSPECTUS for each fund
                    describes its investment objective(s), policies and
                    investment minimums, and should be read before investment.
    
 
                    EXCHANGE PROCEDURES. You can process an exchange by
                    contacting your Morgan Stanley Dean Witter Financial Advisor
                    or other authorized financial representative. Otherwise, you
                    must forward an exchange privilege authorization form to the
                    Fund's transfer agent - Morgan Stanley Dean Witter Trust FSB
                    - and then write the transfer agent or call (800) 869-NEWS
                    to place an exchange order. You can obtain an exchange
                    privilege authorization form by contacting your Financial
                    Advisor or other authorized financial representative, or by
                    calling (800) 869-NEWS. If you hold share certificates, no
                    exchanges may be processed until we have received all
                    applicable share certificates.
 
                    An exchange to any Morgan Stanley Dean Witter Fund (except a
                    Money Market Fund) is made on the basis of the next
                    calculated net asset values of the Funds involved after the
                    exchange instructions are accepted. When exchanging into a
                    Money Market Fund, the Fund's shares are sold at their next
                    calculated net asset value and the Money Market Fund's
                    shares are purchased at their net asset value on the
                    following business day.
 
                    The Fund may terminate or revise the exchange privilege upon
                    required notice. Certain services normally available to
                    shareholders of Money Market Funds, including the check
                    writing privilege, are not available for Money Market Fund
                    shares you acquire in an exchange.
 
                    TELEPHONE EXCHANGES. For your protection when calling Morgan
                    Stanley Dean Witter Trust FSB, we will employ reasonable
                    procedures to confirm that exchange instructions
                    communicated over the telephone are genuine. These
                    procedures may include requiring various forms of personal
                    identification such as name, mailing address, social
                    security or other tax identification number. Telephone
                    instructions also may be recorded.
 
   
                    Telephone instructions will be accepted if received by the
                    Fund's transfer agent between 9:00 a.m. and 4:00 p.m.
                    Eastern time, on any day the New York Stock Exchange is open
                    for business. During periods of drastic economic or market
                    changes, it is possible that the telephone exchange
                    procedures may be difficult to implement, although this has
                    not been the case with the Fund in the past.
    
 
10
<PAGE>
   
                    MARGIN ACCOUNTS. If you have pledged your Fund shares in a
                    margin account, contact your Morgan Stanley Dean Witter
                    Financial Advisor or other authorized financial
                    representative regarding restrictions on the exchange of
                    such shares.
    
 
                    TAX CONSIDERATIONS OF EXCHANGES. If you exchange shares of
                    the Fund for shares of another Morgan Stanley Dean Witter
                    Fund there are important tax considerations. For tax
                    purposes, the exchange out of the Fund is considered a sale
                    of Fund shares - and the exchange into the other Fund is
                    considered a purchase. As a result, you may realize a
                    capital gain or loss.
 
                    You should review the "Tax Consequences" section and consult
                    your own tax professional about the tax consequences of an
                    exchange.
 
                    FREQUENT EXCHANGES. A pattern of frequent exchanges may
                    result in the Fund limiting or prohibiting, at its
                    discretion, additional purchases and/or exchanges. The Fund
                    will notify you in advance of limiting your exchange
                    privileges.
 
                    CDSC CALCULATIONS ON EXCHANGES. See the "Share Class
                    Arrangements" section of this PROSPECTUS for a further
                    discussion of how applicable contingent deferred sales
                    charges (CDSCs) are calculated for shares of one Morgan
                    Stanley Dean Witter Fund that are exchanged for shares of
                    another.
 
                    FOR FURTHER INFORMATION REGARDING EXCHANGE PRIVILEGES, YOU
                    SHOULD CONTACT YOUR MORGAN STANLEY DEAN WITTER FINANCIAL
                    ADVISOR OR CALL (800) 869-NEWS.
 
                                                                              11
<PAGE>
(Sidebar)
SYSTEMATIC
WITHDRAWAL PLAN
   
This plan allows you to withdraw money automatically from your Fund account at
regular intervals. Contact your Morgan Stanley Dean Witter Financial Advisor for
more details.
    
(End Sidebar)
 
ICON                HOW TO SELL SHARES
- --------------------------------------------------------------------------------
   
                    You can sell some or all of your Fund shares at any time. If
                    you sell Class A, Class B or Class C shares, your net sale
                    proceeds are reduced by the amount of any applicable CDSC.
                    Your shares will be sold at the next price calculated after
                    we receive your order to sell as described below.
    
 
   
<TABLE>
<CAPTION>
 OPTIONS            PROCEDURES
<S>                 <C>
- --------------------------------------------------------------------------------
 Contact your       To sell your shares, simply call your Morgan Stanley Dean
 Financial Advisor  Witter Financial Advisor or other authorized financial
                    representative.
                    ------------------------------------------------------------
 ICON               Payment will be sent to the address to which the account is
                    registered or deposited in your brokerage account.
- --------------------------------------------------------------------------------
 By Letter          You can also sell your shares by writing a "letter of
                    instruction" that includes:
 ICON               - your account number;
                    - the dollar amount or the number of shares you wish to
                      sell;
                    - the Class of shares you wish to sell; and
                    - the signature of each owner as it appears on the account.
                    ------------------------------------------------------------
                    If you are requesting payment to anyone other than the
                    registered owner(s) or that payment be sent to any address
                    other than the address of the registered owner(s) or
                    pre-designated bank account, you will need a signature
                    guarantee. You can obtain a signature guarantee from an
                    eligible guarantor acceptable to Morgan Stanley Dean Witter
                    Trust FSB. (You should contact Morgan Stanley Dean Witter
                    Trust FSB at (800) 869-NEWS for a determination as to
                    whether a particular institution is an eligible guarantor.)
                    A notary public CANNOT provide a signature guarantee.
                    Additional documentation may be required for shares held by
                    a corporation, partnership, trustee or executor.
                    ------------------------------------------------------------
                    Mail the letter to Morgan Stanley Dean Witter Trust FSB at
                    P.O. Box 983, Jersey City, NJ 07303. If you hold share
                    certificates, you must return the certificates, along with
                    the letter and any required additional documentation.
                    ------------------------------------------------------------
                    A check will be mailed to the name(s) and address in which
                    the account is registered, or otherwise according to your
                    instructions.
- --------------------------------------------------------------------------------
 Systematic         If your investment in all of the Morgan Stanley Dean Witter
 Withdrawal Plan    Family of Funds has a total market value of at least
                    $10,000, you may elect to withdraw amounts of $25 or more,
                    or in any whole percentage of a Fund's balance (provided the
                    amount is at least $25), on a monthly, quarterly,
                    semi-annual or annual basis, from any Fund with a balance of
                    at least $1,000. Each time you add a Fund to the plan, you
                    must meet the plan requirements.
                    ------------------------------------------------------------
                    Amounts withdrawn are subject to any applicable CDSC. A CDSC
                    may be waived under certain circumstances. See the Class B
                    waiver categories listed in the "Share Class Arrangements"
                    section of this PROSPECTUS.
                    ------------------------------------------------------------
                    To sign up for the Systematic Withdrawal Plan, contact your
                    Morgan Stanley Dean Witter Financial Advisor or call (800)
                    869-NEWS. You may terminate or suspend your plan at any
                    time. Please remember that withdrawals from the plan are
                    sales of shares, not Fund "distributions," and ultimately
                    may exhaust your account balance. The Fund may terminate or
                    revise the plan at any time.
- --------------------------------------------------------------------------------
</TABLE>
    
 
   
                    PAYMENT FOR SOLD SHARES. After we receive your complete
                    instructions to sell as described above, a check will be
                    mailed to you within seven days, although we will attempt to
                    make payment within one business day. Payment may also be
                    sent to your brokerage account.
    
 
   
                    Payment may be postponed or the right to sell your shares
                    suspended under unusual circumstances. If you request to
                    sell shares that were recently purchased by check, payment
                    of the sale proceeds may be delayed for the minimum time
                    needed to verify that the check has been honored (not more
                    than fifteen days from the time we receive the check).
    
 
12
<PAGE>
                    TAX CONSIDERATIONS. Normally, your sale of Fund shares is
                    subject to federal and state income tax. You should review
                    the "Tax Consequences" section of this PROSPECTUS and
                    consult your own tax professional about the tax consequences
                    of a sale.
 
                    REINSTATEMENT PRIVILEGE. If you sell Fund shares and have
                    not previously exercised the reinstatement privilege, you
                    may, within 35 days after the date of sale, invest any
                    portion of the proceeds in the same Class of Fund shares at
                    their net asset value and receive a pro rata credit for any
                    CDSC paid in connection with the sale.
 
                    INVOLUNTARY SALES. The Fund reserves the right, on sixty
                    days' notice, to sell the shares of any shareholder (other
                    than shares held in an IRA or 403(b) Custodial Account)
                    whose shares, due to sales by the shareholder, have a value
                    below $100, or in the case of an account opened through
                    EASYINVEST-SM-, if after 12 months the shareholder has
                    invested less than $1,000 in the account.
 
                    However, before the Fund sells your shares in this manner,
                    we will notify you and allow you sixty days to make an
                    additional investment in an amount that will increase the
                    value of your account to at least the required amount before
                    the sale is processed. No CDSC will be imposed on any
                    involuntary sale.
 
                    MARGIN ACCOUNTS. Certain restrictions may apply to Fund
                    shares pledged in margin accounts with Dean Witter Reynolds
                    or another authorized broker-dealer of Fund shares. If you
                    hold Fund shares in this manner, please contact your Morgan
                    Stanley Dean Witter Financial Advisor or other authorized
                    financial representative for more details.
(Sidebar)
TARGETED DIVIDENDS-SM-
You may select to have your Fund distributions automatically invested in other
Classes of Fund shares or Classes of another Morgan Stanley Dean Witter Fund
that you own. Contact your Morgan Stanley Dean Witter Financial Advisor for
further information about this service.
(End Sidebar)
 
ICON                DISTRIBUTIONS
- --------------------------------------------------------------------------------
   
                    The Fund passes substantially all of its earnings from
                    income and capital gains along to its investors as
                    "distributions." The Fund earns interest from fixed-income
                    investments. These amounts are passed along to Fund
                    shareholders as "income dividend distributions." The Fund
                    realizes capital gains whenever it sells securities for a
                    higher price than it paid for them. These amounts may be
                    passed along as "capital gain distributions."
    
 
   
                    The Fund declares income dividends separately for each
                    Class. Distributions paid on Class A and Class D shares
                    usually will be higher than for Class B and Class C because
                    distribution fees that Class B and Class C pay are higher.
                    Normally, income dividends are declared on each day the New
                    York Stock Exchange is open for business, and distributed
                    monthly, and any capital gains are distributed annually in
                    December. The Fund, however, may retain and reinvest any
                    long-term capital gains. The Fund may at times make payments
                    from sources other than income or capital gains that
                    represent a return of a portion of your investment.
    
 
                    Distributions are reinvested automatically in additional
                    shares of the same Class and automatically credited to your
                    account, unless you request in writing that all
                    distributions be paid in cash. If you elect the cash option,
                    processing of your dividend checks begins immediately
                    following the monthly payment date, and the Fund will mail a
                    monthly dividend check to you normally during the first
                    seven days of the following month. No interest will accrue
                    on uncashed checks. If you wish to change how your
                    distributions are paid, your request should be received by
                    the Fund's transfer agent, Morgan Stanley Dean Witter Trust
                    FSB, at least five business days prior to the record date of
                    the distributions.
 
                                                                              13
<PAGE>
ICON                TAX CONSEQUENCES
- --------------------------------------------------------------------------------
                    As with any investment, you should consider how your Fund
                    investment will be taxed. The tax information in this
                    PROSPECTUS is provided as general information. You should
                    consult your own tax professional about the tax consequences
                    of an investment in the Fund.
 
                    Unless your investment in the Fund is through a tax-deferred
                    retirement account, such as a 401(k) plan or IRA, you need
                    to be aware of the possible tax consequences when:
 
                    - The Fund makes distributions; and
 
                    - You sell Fund shares, including an exchange to another
                      Morgan Stanley Dean Witter Fund.
 
                    TAXES ON DISTRIBUTIONS. Your distributions are normally
                    subject to federal and state income tax when they are paid,
                    whether you take them in cash or reinvest them in Fund
                    shares. A distribution also may be subject to local income
                    tax. Any income dividend distributions and any short-term
                    capital gain distributions are taxable to you as ordinary
                    income. Any long-term capital gain distributions are taxable
                    as long-term capital gains, no matter how long you have
                    owned shares in the Fund.
 
                    Every January, you will be sent a statement (IRS Form
                    1099-DIV) showing the taxable distributions paid to you in
                    the previous year. The statement provides full information
                    on your dividends and capital gains for tax purposes.
 
                    TAXES ON SALES. Your sale of Fund shares normally is subject
                    to federal and state income tax and may result in a taxable
                    gain or loss to you. A sale also may be subject to local
                    income tax. Your exchange of Fund shares for shares of
                    another Morgan Stanley Dean Witter Fund is treated for tax
                    purposes like a sale of your original shares and a purchase
                    of your new shares. Thus, the exchange may, like a sale,
                    result in a taxable gain or loss to you and will give you a
                    new tax basis for your new shares.
 
                    When you open your Fund account, you should provide your
                    social security or tax identification number on your
                    investment application. By providing this information, you
                    will avoid being subject to a federal backup withholding tax
                    of 31% on taxable distributions and redemption proceeds. Any
                    withheld amount would be sent to the IRS as an advance tax
                    payment.
 
14
<PAGE>
ICON                SHARE CLASS ARRANGEMENTS
- --------------------------------------------------------------------------------
                    The Fund offers several Classes of shares having different
                    distribution arrangements designed to provide you with
                    different purchase options according to your investment
                    needs. Your Morgan Stanley Dean Witter Financial Advisor or
                    other authorized financial representative can help you
                    decide which Class may be appropriate for you.
 
                    The general public is offered three Classes: Class A shares,
                    Class B shares and Class C shares, which differ principally
                    in terms of sales charges and ongoing expenses. A fourth
                    Class, Class D shares, is offered only to a limited category
                    of investors. Shares that you acquire through reinvested
                    distributions will not be subject to any front-end sales
                    charge or CDSC - contingent deferred sales charge. Sales
                    personnel may receive different compensation for selling
                    each Class of shares. The sales charges applicable to each
                    Class provide for the distribution financing of shares of
                    that Class.
 
   
                    The chart below compares the sales charge and annual 12b-1
                    fee applicable to each Class:
    
 
   
<TABLE>
<CAPTION>
CLASS   SALES CHARGE                              ANNUAL 12B-1 FEE
<S>     <C>                                       <C>
- ------------------------------------------------------------------
 A      Maximum 4.25% initial sales charge
        reduced for purchase of $25,000 or more;
        shares sold without an initial sales
        charge are generally subject to a 1.0%
        CDSC during the first year                          0.25%
- ------------------------------------------------------------------
 B      Maximum 5.0% CDSC during the first year
        decreasing to 0% after six years                    0.85%
- ------------------------------------------------------------------
 C      1.0% CDSC during the first year                     0.85%
- ------------------------------------------------------------------
 D      None                                            None
- ------------------------------------------------------------------
</TABLE>
    
 
                                                                              15
<PAGE>
(Sidebar)
FRONT-END SALES
CHARGE OR FSC
An initial sales charge you pay when purchasing Class A shares that is based on
a percentage of the offering price. The percentage declines based upon the
dollar value of Class A shares you purchase. We offer three ways to reduce your
Class A sales charges - the COMBINED PURCHASE PRIVILEGE, RIGHT OF ACCUMULATION
and LETTER OF INTENT.
(End Sidebar)
 
   
                     CLASS A SHARES  Class A shares are sold at net asset value
                    plus an initial sales charge of up to 4.25%. The initial
                    sales charge is reduced for purchases of $25,000 or more
                    according to the schedule below. Investments of $1 million
                    or more are not subject to an initial sales charge, but are
                    generally subject to a contingent deferred sales charge, or
                    CDSC, of 1.0% on sales made within one year after the last
                    day of the month of purchase. The CDSC will be assessed in
                    the same manner and with the same CDSC waivers as with Class
                    B shares. Class A shares are also subject to a distribution
                    (12b-1) fee of up to 0.25% of the average daily net assets
                    of the Class.
    
 
                    The offering price of Class A shares includes a sales charge
                    (expressed as a percentage of the offering price) on a
                    single transaction as shown in the following table:
 
<TABLE>
<CAPTION>
                                                      FRONT-END SALES CHARGE
                                          ----------------------------------------------
                                          PERCENTAGE OF PUBLIC    APPROXIMATE PERCENTAGE
 AMOUNT OF SINGLE TRANSACTION                OFFERING PRICE         OF AMOUNT INVESTED
<S>                                       <C>                     <C>
- ----------------------------------------------------------------------------------------
 Less than $25,000                                 4.25%                    4.44%
- ----------------------------------------------------------------------------------------
 $25,000 but less than $50,000                     4.00%                    4.17%
- ----------------------------------------------------------------------------------------
 $50,000 but less than $100,000                    3.50%                    3.63%
- ----------------------------------------------------------------------------------------
 $100,000 but less than $250,000                   2.75%                    2.83%
- ----------------------------------------------------------------------------------------
 $250,000 but less than $1 million                 1.75%                    1.78%
- ----------------------------------------------------------------------------------------
 $1 million and over                                  0                        0
- ----------------------------------------------------------------------------------------
</TABLE>
 
                    The reduced sales charge schedule is applicable to purchases
                    of Class A shares in a single transaction by:
 
                    - A single account (including an individual, trust or
                      fiduciary account).
 
                    - Family member accounts (limited to husband, wife and
                    children under the age
                     of 21).
 
                    - Pension, profit sharing or other employee benefit plans of
                      companies and their affiliates.
 
   
                    - Tax-exempt organizations.
    
 
                    - Groups organized for a purpose other than to buy mutual
                      fund shares.
 
                    COMBINED PURCHASE PRIVILEGE. You also will have the benefit
                    of reduced sales charges by combining purchases of Class A
                    shares of the Fund in a single transaction with purchases of
                    Class A shares of other Multi-Class Funds and shares of FSC
                    Funds.
 
                    RIGHT OF ACCUMULATION. You also may benefit from a reduction
                    of sales charges if the cumulative net asset value of Class
                    A shares of the Fund purchased in a single transaction,
                    together with shares of other Funds you currently own which
                    were previously purchased at a price including a front-end
                    sales charge (including shares acquired through reinvestment
                    of distributions), amounts to $25,000 or more. Also, if you
                    have a cumulative net asset value of all your Class A and
                    Class D shares equal to at least $5 million (or $25 million
                    for certain employee benefit plans), you are eligible to
                    purchase Class D shares of any Fund subject to the Fund's
                    minimum initial investment requirement.
 
                    You must notify your Morgan Stanley Dean Witter Financial
                    Advisor or other authorized financial representative (or
                    Morgan Stanley Dean Witter Trust FSB if you purchase
                    directly through the Fund), at the time a purchase order is
                    placed, that the
 
16
<PAGE>
                    purchase qualifies for the reduced charge under the Right of
                    Accumulation. Similar notification must be made in writing
                    when an order is placed by mail. The reduced sales charge
                    will not be granted if: (i) notification is not furnished at
                    the time of the order; or (ii) a review of the records of
                    Dean Witter Reynolds or other authorized dealer of Fund
                    shares or the Fund's transfer agent does not confirm your
                    represented holdings.
 
                    LETTER OF INTENT. The schedule of reduced sales charges for
                    larger purchases also will be available to you if you enter
                    into a written "letter of intent." A letter of intent
                    provides for the purchase of Class A shares of the Fund or
                    other Multi-Class Funds or shares of FSC Funds within a
                    thirteen-month period. The initial purchase under a letter
                    of intent must be at least 5% of the stated investment goal.
                    To determine the applicable sales charge reduction, you may
                    also include: (1) the cost of shares of other Morgan Stanley
                    Dean Witter Funds which were previously purchased at a price
                    including a front-end sales charge during the 90-day period
                    prior to the distributor receiving the letter of intent, and
                    (2) the cost of shares of other Funds you currently own
                    acquired in exchange for shares of Funds purchased during
                    that period at a price including a front-end sales charge.
                    You can obtain a letter of intent by contacting your Morgan
                    Stanley Dean Witter Financial Advisor or other authorized
                    financial representative, or by calling (800) 869-NEWS. If
                    you do not achieve the stated investment goal within the
                    thirteen-month period, you are required to pay the
                    difference between the sales charges otherwise applicable
                    and sales charges actually paid.
 
                    OTHER FRONT-END SALES CHARGE WAIVERS. In addition to
                    investments of $1 million or more, your purchase of Class A
                    shares is not subject to a front-end sales charge (or a CDSC
                    upon sale) if your account qualifies under one of the
                    following categories:
 
                    - A trust for which Morgan Stanley Dean Witter Trust FSB
                      provides discretionary trustee services.
 
                    - Persons participating in a fee-based investment program
                      (subject to all of its terms and conditions, including
                      mandatory sale or transfer restrictions on termination)
                      approved by the Fund's distributor pursuant to which they
                      pay an asset-based fee for investment advisory,
                      administrative and/or brokerage services.
 
                    - Employer-sponsored employee benefit plans, whether or not
                      qualified under the Internal Revenue Code, for which
                      Morgan Stanley Dean Witter Trust FSB serves as trustee or
                      Dean Witter Reynolds' Retirement Plan Services serves as
                      recordkeeper under a written Recordkeeping Services
                      Agreement ("MSDW Eligible Plans") which have at least 200
                      eligible employees.
 
                    - A MSDW Eligible Plan whose Class B shares have converted
                      to Class A shares, regardless of the plan's asset size or
                      number of eligible employees.
 
                    - A client of a Morgan Stanley Dean Witter Financial Advisor
                      who joined us from another investment firm within six
                      months prior to the date of purchase of Fund shares, and
                      you used the proceeds from the sale of shares of a
                      proprietary mutual fund of that Financial Advisor's
                      previous firm that imposed either a front-end or deferred
                      sales charge to purchase Class A shares, provided that:
                      (1) you sold the shares not more than 60 days prior to the
                      purchase of Fund shares, and (2) the sale proceeds were
                      maintained in the interim in cash or a money market fund.
 
                                                                              17
<PAGE>
(Sidebar)
CONTINGENT DEFERRED SALES CHARGE OR CDSC
A fee you pay when you sell shares of certain Morgan Stanley Dean Witter Funds
purchased without an initial sales charge. This fee declines the longer you hold
your shares as set forth in the table.
(End Sidebar)
 
                     CLASS B SHARES  Class B shares are offered at net asset
                    value with no initial sales charge but are subject to a
                    contingent deferred sales charge, or CDSC, as set forth in
                    the table below. For the purpose of calculating the CDSC,
                    shares are deemed to have been purchased on the last day of
                    the month during which they were purchased.
 
<TABLE>
<CAPTION>
 YEAR SINCE PURCHASE PAYMENT MADE              CDSC AS A PERCENTAGE OF AMOUNT REDEEMED
<S>                                       <C>
- --------------------------------------------------------------------------------------------
 First                                                            5.0%
- --------------------------------------------------------------------------------------------
 Second                                                           4.0%
- --------------------------------------------------------------------------------------------
 Third                                                            3.0%
- --------------------------------------------------------------------------------------------
 Fourth                                                           2.0%
- --------------------------------------------------------------------------------------------
 Fifth                                                            2.0%
- --------------------------------------------------------------------------------------------
 Sixth                                                            1.0%
- --------------------------------------------------------------------------------------------
 Seventh and thereafter                                          None
- --------------------------------------------------------------------------------------------
</TABLE>
 
   
                    Each time you place an order to sell or exchange shares,
                    shares with no CDSC will be sold or exchanged first, then
                    shares with the lowest CDSC will be sold or exchanged next.
                    For any shares subject to a CDSC, the CDSC will be assessed
                    on an amount equal to the lesser of the current market value
                    or the cost of the shares being sold.
    
 
                    CDSC WAIVERS. A CDSC, if otherwise applicable, will be
                    waived in the case of:
 
                    - Sales of shares held at the time you die or become
                      disabled (within the definition in Section 72(m)(7) of the
                      Internal Revenue Code which relates to the ability to
                      engage in gainful employment), if the shares are: (i)
                      registered either in your name (not a trust) or in the
                      names of you and your spouse as joint tenants with right
                      of survivorship; or (ii) held in a qualified corporate or
                      self-employed retirement plan, IRA or 403(b) Custodial
                      Account, provided in either case that the sale is
                      requested within one year of your death or initial
                      determination of disability.
 
                    - Sales in connection with the following retirement plan
                      "distributions": (i) lump-sum or other distributions from
                      a qualified corporate or self-employed retirement plan
                      following retirement (or, in the case of a "key employee"
                      of a "top heavy" plan, following attainment of age 59
                      1/2); (ii) distributions from an IRA or 403(b) Custodial
                      Account following attainment of age 59 1/2; or (iii) a
                      tax-free return of an excess IRA contribution (a
                      distribution does not include a direct transfer of IRA,
                      403(b) Custodial Account or retirement plan assets to a
                      successor custodian or trustee).
 
                    - Sales of shares held for you as a participant in a MSDW
                      Eligible Plan.
 
                    - Sales of shares in connection with the Systematic
                      Withdrawal Plan of up to 12% annually of the value of each
                      Fund from which plan sales are made. The percentage is
                      determined on the date you establish the Systematic
                      Withdrawal Plan and based on the next calculated share
                      price. You may have this CDSC waiver applied in amounts up
                      to 1% per month, 3% per quarter, 6% semi-annually or 12%
                      annually. Shares with no CDSC will be sold first, followed
                      by those with the lowest CDSC. As such, the waiver benefit
                      will be reduced by the amount of your shares that are not
                      subject to a CDSC. If you suspend your participation in
                      the plan, you may later resume plan payments without
                      requiring a new determination of the account value for the
                      12% CDSC waiver.
 
18
<PAGE>
                    All waivers will be granted only following the Distributor
                    receiving confirmation of your entitlement. If you believe
                    you are eligible for a CDSC waiver, please contact your
                    Financial Advisor or call (800) 869-NEWS.
 
                    DISTRIBUTION FEE. Class B shares also are subject to an
                    annual 12b-1 fee of 0.85% of the lesser of: (a) the average
                    daily aggregate gross purchases by all shareholders of the
                    Fund's Class B shares since the inception of the Fund (not
                    including reinvestments of dividends or capital gains
                    distributions), less the average daily aggregate net asset
                    value of the Fund's Class B shares sold by all shareholders
                    since the Fund's inception upon which a CDSC has been
                    imposed or waived, or (b) the average daily net assets of
                    Class B.
 
                    CONVERSION FEATURE. After ten (10) years, Class B shares
                    will convert automatically to Class A shares of the Fund
                    with no initial sales charge. The ten year period runs from
                    the last day of the month in which the shares were
                    purchased, or in the case of Class B shares acquired through
                    an exchange, from the last day of the month in which the
                    original Class B shares were purchased; the shares will
                    convert to Class A shares based on their relative net asset
                    values in the month following the ten year period. At the
                    same time, an equal proportion of Class B shares acquired
                    through automatically reinvested distributions will convert
                    to Class A shares on the same basis. (Class B shares held
                    before May 1, 1997, however, will convert to Class A shares
                    in May 2007.)
 
                    In the case of Class B shares held in a MSDW Eligible Plan,
                    the plan is treated as a single investor and all Class B
                    shares will convert to Class A shares on the conversion date
                    of the Class B shares of a Morgan Stanley Dean Witter Fund
                    purchased by that plan.
 
                    Currently, the Class B share conversion is not a taxable
                    event; the conversion feature may be cancelled if it is
                    deemed a taxable event in the future by the Internal Revenue
                    Service.
 
                    If you exchange your Class B shares for shares of a Money
                    Market Fund, No-Load Fund or Short-Term U.S. Treasury Trust,
                    the holding period for conversion is frozen as of the last
                    day of the month of the exchange and resumes on the last day
                    of the month you exchange back into Class B shares.
 
                    EXCHANGING SHARES SUBJECT TO A CDSC. There are special
                    considerations when you exchange Fund shares that are
                    subject to a CDSC. When determining the length of time you
                    held the shares and the corresponding CDSC rate, any period
                    (starting at the end of the month) during which you held
                    shares of a fund that does NOT charge a CDSC WILL NOT BE
                    COUNTED. Thus, in effect the "holding period" for purposes
                    of calculating the CDSC is frozen upon exchanging into a
                    fund that does not charge a CDSC.
 
                    For example, if you held Class B shares of the Fund for one
                    year, exchanged to Class B of another Morgan Stanley Dean
                    Witter Multi-Class Fund for another year, then sold your
                    shares, a CDSC rate of 4% would be imposed on the shares
                    based on a two year holding period -- one year for each
                    Fund. However, if you had exchanged the shares of the Fund
                    for a Money Market Fund (which does not charge a CDSC)
                    instead of the Multi-Class Fund, then sold your shares, a
                    CDSC rate of 5% would be imposed on the shares based on a
                    one year holding period. The one year in the Money Market
                    Fund would not be counted. Nevertheless, if shares subject
                    to a
 
                                                                              19
<PAGE>
                    CDSC are exchanged for a Fund that does not charge a CDSC,
                    you will receive a credit when you sell the shares equal to
                    the distribution (12b-1) fees, if any, you paid on those
                    shares while in that Fund up to the amount of any applicable
                    CDSC.
 
                    In addition, shares that are exchanged into or from a Morgan
                    Stanley Dean Witter Fund subject to a higher CDSC rate will
                    be subject to the higher rate, even if the shares are
                    re-exchanged into a Fund with a lower CDSC rate.
 
   
                     CLASS C SHARES  Class C shares are sold at net asset value
                    with no initial sales charge but are subject to a CDSC of
                    1.0% on sales made within one year after the last day of the
                    month of purchase. The CDSC will be assessed in the same
                    manner and with the same CDSC waivers as with Class B
                    shares.
    
 
                    DISTRIBUTION FEE. Class C shares are subject to an annual
                    distribution (12b-1) fee of 0.85% of the average daily net
                    assets of that Class. The Class C shares' distribution fee
                    may cause that Class to have higher expenses and pay lower
                    dividends than Class A or Class D shares. Unlike Class B
                    shares, Class C shares have no conversion feature and,
                    accordingly, an investor that purchases Class C shares may
                    be subject to distribution (12b-1) fees applicable to Class
                    C shares for an indefinite period.
 
                     CLASS D SHARES  Class D shares are offered without any
                    sales charge on purchases or sales and without any
                    distribution (12b-1) fee. Class D shares are offered only to
                    investors meeting an initial investment minimum of $5
                    million ($25 million for MSDW Eligible Plans) and the
                    following investor categories:
 
                    - Investors participating in the Investment Manager's mutual
                      fund asset allocation program (subject to all of its terms
                      and conditions, including mandatory sale or transfer
                      restrictions on termination) pursuant to which they pay an
                      asset-based fee.
 
                    - Persons participating in a fee-based investment program
                      (subject to all of its terms and conditions, including
                      mandatory sale or transfer restrictions on termination)
                      approved by the Fund's distributor pursuant to which they
                      pay an asset-based fee for investment advisory,
                      administrative and/or brokerage services.
 
                    - Employee benefit plans maintained by Morgan Stanley Dean
                      Witter & Co. or any of its subsidiaries for the benefit of
                      certain employees of Morgan Stanley Dean Witter & Co. and
                      its subsidiaries.
 
                    - Certain unit investment trusts sponsored by Dean Witter
                      Reynolds.
 
                    - Certain other open-end investment companies whose shares
                      are distributed by the Fund's distributor.
 
                    - Investors who were shareholders of the Dean Witter
                      Retirement Series on September 11, 1998 for additional
                      purchases for their former Dean Witter Retirement Series
                      accounts.
 
                    MEETING CLASS D ELIGIBILITY MINIMUMS. To meet the $5 million
                    ($25 million for MSDW Eligible Plans) initial investment to
                    qualify to purchase Class D shares you may combine: (1)
                    purchases in a single transaction of Class D shares of the
                    Fund and other Morgan Stanley Dean Witter Multi-Class Funds
                    and/or (2) previous
 
20
<PAGE>
                    purchases of Class A and Class D shares of Multi-Class Funds
                    and shares of FSC Funds you currently own, along with shares
                    of Morgan Stanley Dean Witter Funds you currently own that
                    you acquired in exchange for those shares.
 
                     NO SALES CHARGES FOR REINVESTED CASH DISTRIBUTIONS  If you
                    receive a cash payment representing an income dividend or
                    capital gain and you reinvest that amount in the applicable
                    Class of shares by returning the check within 30 days of the
                    payment date, the purchased shares would not be subject to
                    an initial sales charge or CDSC.
 
   
                     PLAN OF DISTRIBUTION (RULE 12B-1 FEES)  The Fund has
                    adopted a Plan of Distribution in accordance with Rule 12b-1
                    under the Investment Company Act of 1940 with respect to the
                    distribution of Class A, Class B and Class C shares. The
                    Plan allows the Fund to pay distribution fees for the sale
                    and distribution of these shares. It also allows the Fund to
                    pay for services to shareholders of Class A, Class B and
                    Class C shares. Because these fees are paid out of the
                    Fund's assets on an ongoing basis, over time these fees will
                    increase the cost of your investment in these Classes and
                    may cost you more than paying other types of sales charges.
    
 
                                                                              21
<PAGE>
FINANCIAL HIGHLIGHTS
 
        The financial highlights table is intended to help you understand the
        Fund's financial performance for the past 5 fiscal years of the Fund.
        Certain information reflects financial results for a single Fund share.
        The total returns in the table represent the rate an investor would have
        earned or lost on an investment in the Fund (assuming reinvestment of
        all dividends and distributions).
 
   
        This information has been audited by PricewaterhouseCoopers LLP, whose
        report, along with the Fund's financial statements, is included in the
        annual report, which is available upon request.
    
 
   
<TABLE>
<CAPTION>
CLASS B SHARES
- ----------------------------------------------------------------------------------------------------------------------------
 FOR THE YEAR ENDED OCTOBER 31,                                   1998        1997*        1996         1995        1994
<S>                                                              <C>         <C>         <C>          <C>        <C>
- ----------------------------------------------------------------------------------------------------------------------------
 
 SELECTED PER SHARE DATA:
- ----------------------------------------------------------------------------------------------------------------------------
 Net asset value, beginning of period                            $  9.36     $  9.25     $   9.49     $   8.74     $   10.03
- ----------------------------------------------------------------------------------------------------------------------------
 INCOME (LOSS) FROM INVESTMENT OPERATIONS:
    Net investment income                                           0.58        0.59         0.59         0.59          0.60
    Net realized and unrealized gain (loss)                         0.36        0.11        (0.25)        0.75         (1.28)
                                                                 -------     -------     --------     --------   -----------
 Total income (loss) from investment operations                     0.94        0.70         0.34         1.34         (0.68)
- ----------------------------------------------------------------------------------------------------------------------------
 Less dividends from net investment income                         (0.58)      (0.59)       (0.58)       (0.59)        (0.61)
- ----------------------------------------------------------------------------------------------------------------------------
 Net asset value, end of period                                  $  9.72     $  9.36     $   9.25     $   9.49     $    8.74
- ----------------------------------------------------------------------------------------------------------------------------
 
 TOTAL RETURN+                                                     10.35%       7.89%        3.79%       15.89%        (6.92)%
- ----------------------------------------------------------------------------------------------------------------------------
 
 RATIOS TO AVERAGE NET ASSETS:
- ----------------------------------------------------------------------------------------------------------------------------
 Expenses                                                           1.54%(1)    1.53%        1.53%        1.52%         1.52%
- ----------------------------------------------------------------------------------------------------------------------------
 Net investment income                                              6.09%(1)    6.41%        6.31%        6.53%         6.56%
- ----------------------------------------------------------------------------------------------------------------------------
 
 SUPPLEMENTAL DATA:
- ----------------------------------------------------------------------------------------------------------------------------
 Net assets, end of period, in millions                          $   639     $   623     $    720     $    829     $     841
- ----------------------------------------------------------------------------------------------------------------------------
 Portfolio turnover rate                                              13%         12%          10%           7%           18%
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
   
*Prior to July 28, 1997, the Fund issued one class of shares. All shares of the
 Fund held prior to that date have been designated Class B shares.
+ Does not reflect the deduction of sales charge. Calculated based on the net
  asset value as of the last business day of the period.
(1)Reflects overall Fund ratios for investment income and non-class specific
   expenses.
 
    
 
22
<PAGE>
 
   
<TABLE>
<CAPTION>
CLASS A SHARES
- ---------------------------------------------------------------------------------------------
                                         FOR THE YEAR ENDED    FOR THE PERIOD JULY 28, 1997*
 SELECTED PER SHARE DATA:                 OCTOBER 31, 1998        THROUGH OCTOBER 31, 1997
<S>                                      <C>                   <C>
- ---------------------------------------------------------------------------------------------
 Net asset value, beginning of period           $9.45                       $9.26
- ---------------------------------------------------------------------------------------------
 INCOME FROM INVESTMENT OPERATIONS:
    Net investment income                        0.64                        0.16
    Net realized and unrealized gain             0.34                        0.19
                                               ------                      ------
 Total income from investment
 operations                                      0.98                        0.35
- ---------------------------------------------------------------------------------------------
 Less dividends from net investment
 income                                         (0.64)                      (0.16)
- ---------------------------------------------------------------------------------------------
 Net asset value, end of period                 $9.79                       $9.45
- ---------------------------------------------------------------------------------------------
 
 TOTAL RETURN+                                  10.75%                       3.78%(1)
- ---------------------------------------------------------------------------------------------
 
 RATIOS TO AVERAGE NET ASSETS:
- ---------------------------------------------------------------------------------------------
 Expenses                                        0.93%(3)                    0.92%(2)
- ---------------------------------------------------------------------------------------------
 Net investment income                           6.70%(3)                    6.60%(2)
- ---------------------------------------------------------------------------------------------
 
 SUPPLEMENTAL DATA:
- ---------------------------------------------------------------------------------------------
 Net assets, end of period, in
 thousands                                      $4,894                      $2,051
- ---------------------------------------------------------------------------------------------
 Portfolio turnover rate                           13%                         12%
- ---------------------------------------------------------------------------------------------
</TABLE>
    
 
   
<TABLE>
<CAPTION>
CLASS C SHARES
- ---------------------------------------------------------------------------------------------
 SELECTED PER SHARE DATA:
<S>                                      <C>                   <C>
- ---------------------------------------------------------------------------------------------
 Net asset value, beginning of period           $9.44                       $9.26
- ---------------------------------------------------------------------------------------------
 INCOME FROM INVESTMENT OPERATIONS:
    Net investment income                        0.58                        0.15
    Net realized and unrealized gain             0.36                        0.18
                                               ------                      ------
 Total income from investment
 operations                                      0.94                        0.33
- ---------------------------------------------------------------------------------------------
 Less dividends from net investment
 income                                         (0.58)                      (0.15)
- ---------------------------------------------------------------------------------------------
 Net asset value, end of period                 $9.80                       $9.44
- ---------------------------------------------------------------------------------------------
 
 TOTAL RETURN+                                  10.30%                       3.54%(1)
- ---------------------------------------------------------------------------------------------
 
 RATIOS TO AVERAGE NET ASSETS:
- ---------------------------------------------------------------------------------------------
 Expenses                                        1.54%(3)                    1.52%(2)
- ---------------------------------------------------------------------------------------------
 Net investment income                           6.09%(3)                    5.86%(2)
- ---------------------------------------------------------------------------------------------
 
 SUPPLEMENTAL DATA:
- ---------------------------------------------------------------------------------------------
 Net assets, end of period, in
 thousands                                      $7,204                      $ 721
- ---------------------------------------------------------------------------------------------
 Portfolio turnover rate                           13%                         12%
- ---------------------------------------------------------------------------------------------
</TABLE>
    
 
   
* The date shares were first issued.
+ Does not reflect the deduction of sales charge. Calculated based on the net
asset value as of the last business day of the period.
(1) Not annualized.
(2) Annualized.
(3) Reflects overall Fund ratios for investment income and non-class specific
expenses.
 
    
 
                                                                              23
<PAGE>
FINANCIAL HIGHLIGHTS, CONTINUED
 
   
<TABLE>
<CAPTION>
CLASS D SHARES
- ---------------------------------------------------------------------------------------------
                                         FOR THE YEAR ENDED    FOR THE PERIOD JULY 28, 1997*
 SELECTED PER SHARE DATA:                 OCTOBER 31, 1998        THROUGH OCTOBER 31, 1997
<S>                                      <C>                   <C>
- ---------------------------------------------------------------------------------------------
 Net asset value, beginning of period           $ 9.33                     $ 9.26
- ---------------------------------------------------------------------------------------------
 INCOME FROM INVESTMENT OPERATIONS:
    Net investment income                         0.66                       0.17
    Net realized and unrealized gain              0.36                       0.07
                                               -------                    -------
 Total income from investment
 operations                                       1.02                       0.24
- ---------------------------------------------------------------------------------------------
 Less dividends from net investment
 income                                          (0.66)                     (0.17)
- ---------------------------------------------------------------------------------------------
 Net asset value, end of period                 $ 9.69                     $ 9.33
- ---------------------------------------------------------------------------------------------
 
 TOTAL RETURN+                                   11.30%                      2.62%(1)
- ---------------------------------------------------------------------------------------------
 
 RATIOS TO AVERAGE NET ASSETS:
- ---------------------------------------------------------------------------------------------
 Expenses                                         0.69%(3)                   0.63%(2)
- ---------------------------------------------------------------------------------------------
 Net investment income                            6.94%(3)                   6.40%(2)
- ---------------------------------------------------------------------------------------------
 
 SUPPLEMENTAL DATA:
- ---------------------------------------------------------------------------------------------
 Net assets, end of period, in
 thousands                                      $1,956                     $   69
- ---------------------------------------------------------------------------------------------
 Portfolio turnover rate                            13%                        12%
- ---------------------------------------------------------------------------------------------
</TABLE>
    
 
   
* The date shares were first issued.
+ Calculated based on the net asset value as of the last business day of the
period.
(1) Not annualized.
(2) Annualized.
(3) Reflects overall Fund ratios for investment income and non-class specific
expenses.
 
    
 
24
<PAGE>
NOTES
 
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                                                                              25
<PAGE>
NOTES
 
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26
<PAGE>
MORGAN STANLEY DEAN WITTER
FAMILY OF FUNDS
 
                             The Morgan Stanley Dean Witter Family of Funds
                             offers investors a wide range of investment
                             choices. Come on in and meet the family!
 
- --------------------------------------------------------------------------------
 GROWTH FUNDS
- --------------------------------
 
GROWTH FUNDS
   
Aggressive Equity Fund
    
   
American Value Fund
    
Capital Growth Securities
Developing Growth Securities
Equity Fund
Growth Fund
Market Leader Trust
Mid-Cap Growth Fund
Special Value Fund
Value Fund
 
THEME FUNDS
Financial Services Trust
Health Sciences Trust
Information Fund
Natural Resource Development Securities
Precious Metals and Minerals Trust
Utilities Fund
 
GLOBAL/INTERNATIONAL FUNDS
Competitive Edge Fund - "Best Ideas" Portfolio
European Growth Fund
Fund of Funds - International Portfolio
Global Dividend Growth Securities
Global Utilities Fund
International SmallCap Fund
Japan Fund
Pacific Growth Fund
 
- --------------------------------------------------------------------------------
 GROWTH AND INCOME FUNDS
- --------------------------------
Balanced Growth Fund
Balanced Income Fund
Convertible Securities Trust
Dividend Growth Securities
Fund of Funds - Domestic Portfolio
Income Builder Fund
Mid-Cap Dividend Growth Securities
S&P 500 Index Fund
S&P 500 Select Fund
Strategist Fund
Value-Added Market Series/Equity Portfolio
 
- --------------------------------------------------------------------------------
 INCOME FUNDS
- --------------------------------
 
GOVERNMENT INCOME FUNDS
Federal Securities Trust
Short-Term U.S. Treasury Trust
U.S. Government Securities Trust
 
DIVERSIFIED INCOME FUNDS
Diversified Income Trust
 
CORPORATE INCOME FUNDS
High Yield Securities
Intermediate Income Securities
Short-Term Bond Fund (NL)
 
GLOBAL INCOME FUNDS
World Wide Income Trust
 
TAX-FREE INCOME FUNDS
California Tax-Free Income Fund
Hawaii Municipal Trust (FSC)
Limited Term Municipal Trust (NL)
Multi-State Municipal Series Trust (FSC)
New York Tax-Free Income Fund
Tax-Exempt Securities Trust
 
- --------------------------------------------------------------------------------
 MONEY MARKET FUNDS
- --------------------------------
 
TAXABLE MONEY MARKET FUNDS
Liquid Asset Fund (MM)
U.S. Government Money Market Trust (MM)
 
TAX-FREE MONEY MARKET FUNDS
California Tax-Free Daily Income Trust (MM)
N.Y. Municipal Money Market Trust (MM)
Tax-Free Daily Income Trust (MM)
 
There may be Funds created after this PROSPECTUS was published. Please consult
the inside front cover of a new Fund's PROSPECTUS for its designation, e.g.,
Multi-Class Fund or Money Market Fund.
 
   
Unless otherwise noted, each listed Morgan Stanley Dean Witter Fund, except for
Short-Term U.S. Treasury Trust, is a Multi-Class Fund. A Multi-Class Fund is a
mutual fund offering multiple Classes of shares. The other types of Funds are:
NL - No-Load (Mutual) Fund; MM - Money Market Fund; FSC - A mutual fund sold
with a front-end sales charge and a distribution (12b-1) fee.
    
<PAGE>
MORGAN STANLEY DEAN WITTER
FEDERAL SECURITIES TRUST
 
(Sidebar)
TICKER SYMBOLS:
 
CLASS A:  FDLAX
- -------------------
CLASS B:  FDLBX
- -------------------
CLASS C:  FDLCX
- -------------------
CLASS D:  FDLDX
- -------------------
(End Sidebar)
 
   
                    Additional information about the Fund's investments is
                    available in the Fund's ANNUAL AND SEMI-ANNUAL REPORTS TO
                    SHAREHOLDERS. In the Fund's ANNUAL REPORT, you will find a
                    discussion of the market conditions and investment
                    strategies that significantly affected the Fund's
                    performance during its last fiscal year. The Fund's
                    STATEMENT OF ADDITIONAL INFORMATION also provides additional
                    information about the Fund. The STATEMENT OF ADDITIONAL
                    INFORMATION is incorporated herein by reference (legally is
                    part of this PROSPECTUS). For a free copy of any of these
                    documents, to request other information about the Fund, or
                    to make shareholder inquiries, please call:
    
 
   
                                           (800) 869-NEWS
    
 
                    You also may obtain information about the Fund by calling
                    your Morgan Stanley Dean Witter Financial Advisor or by
                    visiting our Internet site at:
 
                                      WWW.DEANWITTER.COM/FUNDS
 
                    Information about the Fund (including the STATEMENT OF
                    ADDITIONAL INFORMATION) can be viewed and copied at the
                    Securities and Exchange Commission's Public Reference Room
                    in Washington, DC. Information about the Reference Room's
                    operations may be obtained by calling the SEC at (800)
                    SEC-0330. Reports and other information about the Fund are
                    available on the SEC's Internet site (www.sec.gov) and
                    copies of this information may be obtained, upon payment of
                    a duplicating fee, by writing the Public Reference Section
                    of the SEC, Washington, DC 20549-6009.
 
   
(MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST; INVESTMENT COMPANY ACT
FILE NO. 811- 4917)
    
<PAGE>
 
   
STATEMENT OF ADDITIONAL INFORMATION                                 MORGAN
FEBRUARY 26, 1999                                                   STANLEY
                                                                    DEAN WITTER
                                                                    FEDERAL
                                                                    SECURITIES
                                                                    TRUST
 
- --------------------------------------------------------------------------------
    
 
   
    This STATEMENT OF ADDITIONAL INFORMATION is not a PROSPECTUS. The PROSPECTUS
(dated February 26, 1999) for the Morgan Stanley Dean Witter Federal Securities
Trust may be obtained without charge from the Fund at its address or telephone
number listed below or from Dean Witter Reynolds at any of its branch offices.
    
 
   
Morgan Stanley Dean Witter
Federal Securities Trust
Two World Trade Center
New York, New York 10048
(800) 869-NEWS
    
<PAGE>
TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>                                                                                      <C>
I. Fund History........................................................................          4
 
II. Description of the Fund and Its Investments and Risks..............................          4
 
  A. Classification....................................................................          4
 
  B. Investment Strategies and Risks...................................................          4
 
  C. Fund Policies/Investment Restrictions.............................................         11
 
III. Management of the Fund............................................................         13
 
  A. Board of Trustees.................................................................         13
 
  B. Management Information............................................................         13
 
  C. Compensation......................................................................         17
 
IV. Control Persons and Principal Holders of Securities................................         19
 
V. Investment Management and Other Services............................................         19
 
  A. Investment Manager................................................................         19
 
  B. Principal Underwriter.............................................................         20
 
  C. Services Provided by the Investment Manager and Fund Expenses Paid by Third
   Parties.............................................................................         21
 
  D. Dealer Reallowances...............................................................         22
 
  E. Rule 12b-1 Plan...................................................................         22
 
  F. Other Service Providers...........................................................         26
 
VI. Brokerage Allocation and Other Practices...........................................         26
 
  A. Brokerage Transactions............................................................         26
 
  B. Commissions.......................................................................         26
 
  C. Brokerage Selection...............................................................         27
 
  D. Directed Brokerage................................................................         27
 
  E. Regular Broker-Dealers............................................................         28
 
VII. Capital Stock and Other Securities................................................         28
 
VIII. Purchase, Redemption and Pricing of Shares.......................................         28
 
  A. Purchase/Redemption of Shares.....................................................         28
 
  B. Offering Price....................................................................         29
 
IX. Taxation of the Fund and Shareholders..............................................         30
 
X. Underwriters........................................................................         32
 
XI. Calculation of Performance Data....................................................         32
 
XII. Financial Statements..............................................................         33
</TABLE>
    
 
                                       2
<PAGE>
GLOSSARY OF SELECTED DEFINED TERMS
- --------------------------------------------------------------------------------
 
    The terms defined in this glossary are frequently used in this STATEMENT OF
ADDITIONAL INFORMATION (other terms used occasionally are defined in the text of
the document).
 
"CUSTODIAN"--The Bank of New York.
 
"DEAN WITTER REYNOLDS"--Dean Witter Reynolds Inc., a wholly-owned broker-dealer
subsidiary of MSDW.
 
"DISTRIBUTOR"--Morgan Stanley Dean Witter Distributors Inc., a wholly-owned
broker-dealer subsidiary of MSDW.
 
"FINANCIAL ADVISORS"--Morgan Stanley Dean Witter authorized financial services
representatives.
 
"FUND"--Morgan Stanley Dean Witter Federal Securities Trust, a registered
open-end investment company.
 
"INVESTMENT MANAGER"--Morgan Stanley Dean Witter Advisors Inc., a wholly-owned
investment advisor subsidiary of MSDW.
 
"INDEPENDENT TRUSTEES"--Trustees who are not "interested persons" (as defined by
the Investment Company Act) of the Fund.
 
"MORGAN STANLEY & CO."--Morgan Stanley & Co. Incorporated, a wholly-owned
broker-dealer subsidiary of MSDW.
 
"MORGAN STANLEY DEAN WITTER FUNDS"--Registered investment companies (i) for
which the Investment Manager serves as the investment advisor and (ii) that hold
themselves out to investors as related companies for investment and investor
services.
 
"MSDW"--Morgan Stanley Dean Witter & Co., a preeminent global financial services
firm.
 
"MSDW SERVICES COMPANY"--Morgan Stanley Dean Witter Services Company Inc., a
wholly-owned fund services subsidiary of the Investment Manager.
 
"TRANSFER AGENT"--Morgan Stanley Dean Witter Trust FSB, a wholly-owned transfer
agent subsidiary of MSDW.
 
"TRUSTEES"--The Board of Trustees of the Fund.
 
                                       3
<PAGE>
I. FUND HISTORY
- --------------------------------------------------------------------------------
 
    The Fund was organized as a Massachusetts business trust, under a
Declaration of Trust, on November 20, 1986, with the name Dean Witter Government
Securities Plus. On August 17, 1992, the Fund's name was changed by the Trustees
to Dean Witter Federal Securities Trust. Effective June 22, 1998, the Fund's
name was changed to Morgan Stanley Dean Witter Federal Securities Trust.
 
II. DESCRIPTION OF THE FUND AND ITS INVESTMENTS AND RISKS
- --------------------------------------------------------------------------------
 
A. CLASSIFICATION
 
    The Fund is an open-end, diversified management investment company whose
investment objective is a high level of current income.
 
B. INVESTMENT STRATEGIES AND RISKS
 
    The following discussion of the Fund's investment strategies and risks
should be read with the sections of the Fund's PROSPECTUS titled "Principal
Investment Strategies," "Principal Risks," "Additional Investment Strategy
Information," and "Additional Risk Information."
 
    COLLATERALIZED MORTGAGE OBLIGATIONS.  The Fund may invest in CMOs--
collateralized mortgage obligations. CMOs are debt obligations collateralized by
mortgage loans or mortgage pass-through securities (collectively "Mortgage
Assets"). Payments of principal and interest on the Mortgage Assets and any
reinvestment income are used to make payments on the CMOs. CMOs are issued in
multiple classes. Each class has a specific fixed or floating coupon rate and a
stated maturity or final distribution date. The principal and interest on the
Mortgage Assets may be allocated among the classes in a number of different
ways. Certain classes will, as a result of the collection, have more predictable
cash flows than others. As a general matter, the more predictable the cash flow,
the lower the yield relative to other Mortgage Assets. The less predictable the
cash flow, the higher the yield and the greater the risk. The Fund may invest in
any class of CMO.
 
    In a CMO, a series of bonds or certificates is issued in multiple classes.
Each class of CMOs, often referred to as a "tranche," is issued at a specific
fixed or floating coupon rate and has a stated maturity or final distribution
date. Principal prepayments on the Mortgage Assets may cause the CMOs to be
retired substantially earlier than their stated maturities or final distribution
dates. Interest is paid or accrues on all classes of the CMOs on a monthly,
quarterly or semi-annual basis. Certain CMOs may have variable or floating
interest rates and others may be stripped (securities which provide only the
principal or interest feature of the underlying security).
 
    Certain mortgage-backed securities in which the Fund may invest (E.G.,
certain classes of CMOs) may increase or decrease in value substantially with
changes in interest rates and/or the rates of prepayment. In addition, if the
collateral securing CMOs or any third party guarantees are insufficient to make
payments, the Fund could sustain a loss.
 
   
    OPTIONS AND FUTURES TRANSACTIONS.  The Fund may engage in transactions in
listed and OTC options. Listed options are issued or guaranteed by the exchange
on which they are traded or by a clearing corporation such as the Options
Clearing Corporation ("OCC"). Ownership of a listed call option gives the Fund
the right to buy from the OCC (in the U.S.) or other clearing corporation or
exchange, the underlying security covered by the option at the stated exercise
price (the price per unit of the underlying security) by filing an exercise
notice prior to the expiration date of the option. The writer (seller) of the
option would then have the obligation to sell to the OCC (in the U.S.) or other
clearing corporation or exchange, the underlying security at that exercise price
prior to the expiration date of the option, regardless of its then current
market price. Ownership of a listed put option would give the Fund the right to
sell the underlying security to the OCC (in the U.S.) or other clearing
corporation or exchange, at the stated exercise price. Upon notice of exercise
of the put option, the writer of the put would have the obligation to purchase
the underlying security from the OCC (in the U.S.) or other clearing corporation
or exchange, at the exercise price.
    
 
                                       4
<PAGE>
    COVERED CALL WRITING.  The Fund is permitted to write covered call options
on portfolio securities without limit. The Fund will receive from the purchaser,
in return for a call it has written, a "premium;" i.e., the price of the option.
Receipt of these premiums may better enable the Fund to earn a higher level of
current income than it would earn from holding the underlying securities alone.
Moreover, the premium received will offset a portion of the potential loss
incurred by the Fund if the securities underlying the option decline in value.
 
    The Fund may be required, at any time during the option period, to deliver
the underlying security against payment of the exercise price on any calls it
has written. This obligation is terminated upon the expiration of the option
period or at such earlier time when the writer effects a closing purchase
transaction. A closing purchase transaction is accomplished by purchasing an
option of the same series as the option previously written. However, once the
Fund has been assigned an exercise notice, the Fund will be unable to effect a
closing purchase transaction.
 
    Options written by the Fund normally have expiration dates of from up to
eighteen months from the date written. The exercise price of a call option may
be below, equal to or above the current market value of the underlying security
at the time the option is written.
 
    COVERED PUT WRITING.  As a writer of a covered put option, the Fund incurs
an obligation to buy the security underlying the option from the purchaser of
the put, at the option's exercise price at any time during the option period, at
the purchaser's election. Through the writing of a put option, the Fund would
receive income from the premium paid by purchasers. The potential gain on a
covered put option is limited to the premium received on the option (less the
commissions paid on the transaction). During the option period, the Fund may be
required, at any time, to make payment of the exercise price against delivery of
the underlying security. The aggregate value of the obligations underlying puts
may not exceed 50% of the Fund's assets. The operation of and limitations on
covered put options in other respects are substantially identical to those of
call options.
 
    PURCHASING CALL AND PUT OPTIONS.  The Fund may purchase listed and OTC call
and put options in amounts equaling up to 10% of its total assets. The purchase
of a call option would enable the Fund, in return for the premium paid to lock
in a purchase price for a security during the term of the option. The purchase
of a put option would enable the Fund, in return for a premium paid, to lock in
a price at which it may sell a security during the term of the option.
 
    OTC OPTIONS.  OTC options are purchased from or sold (written) to dealers or
financial institutions which have entered into direct agreements with the Fund.
With OTC options, such variables as expiration date, exercise price and premium
will be agreed upon between the Fund and the transacting dealer, without the
intermediation of a third party such as the OCC. The Fund will engage in OTC
option transactions only with member banks of the Federal Reserve Bank System or
primary dealers in U.S. Government securities or with affiliates of such banks
or dealers.
 
    RISKS OF OPTIONS TRANSACTIONS.  The successful use of options depends on the
ability of the Investment Manager to forecast correctly interest rates and/or
market movements. If the market value of the portfolio securities upon which
call options have been written increases, the Fund may receive a lower total
return from the portion of its portfolio upon which calls have been written than
it would have had such calls not been written. During the option period, the
covered call writer has, in return for the premium on the option, given up the
opportunity for capital appreciation above the exercise price should the market
price of the underlying security increase, but has retained the risk of loss
should the price of the underlying security decline. The covered put writer also
retains the risk of loss should the market value of the underlying security
decline below the exercise price of the option less the premium received on the
sale of the option. In both cases, the writer has no control over the time when
it may be required to fulfill its obligation as a writer of the option. Prior to
exercise or expiration, an option position can only be terminated by entering
into a closing purchase or sale transaction. Once an option writer has received
an exercise notice, it cannot effect a closing purchase transaction in order to
terminate its obligation under the option and must deliver or receive the
underlying securities at the exercise price.
 
                                       5
<PAGE>
    The Fund's ability to close out its position as a writer of an option is
dependent upon the existence of a liquid secondary market on option exchanges.
There is no assurance that such a market will exist, particularly in the case of
OTC options.
 
    In the event of the bankruptcy of a broker through which the Fund engages in
transactions in options, the Fund could experience delays and/or losses in
liquidating open positions purchased or sold through the broker and/or incur a
loss of all or part of its margin deposits with the broker. In the case of OTC
options, if the transacting dealer fails to make or take delivery of the
securities underlying an option it has written, in accordance with the terms of
that option, due to insolvency or otherwise, the Fund would lose the premium
paid for the option as well as any anticipated benefit of the transaction.
 
    Each of the exchanges has established limitations governing the maximum
number of call or put options on the same underlying security which may be
written by a single investor, whether acting alone or in concert with others
(regardless of whether such options are written on the same or different
exchanges or are held or written on one or more accounts or through one or more
brokers). An exchange may order the liquidation of positions found to be in
violation of these limits and it may impose other sanctions or restrictions.
These position limits may restrict the number of listed options which the Fund
may write.
 
    The hours of trading for options may not conform to the hours during which
the underlying securities are traded. To the extent that the option markets
close before the markets for the underlying securities, significant price and
rate movements can take place in the underlying markets that cannot be reflected
in the option markets.
 
    There can be no assurance that a liquid secondary market will exist for a
particular option at any specific time.
 
    INTEREST RATE FUTURES CONTRACTS.  As a purchaser of an interest rate futures
contract ("futures contracts"), the Fund incurs an obligation to take delivery
of a specified amount of the obligation underlying the futures contract at a
specified time in the future for a specified price. As a seller of a futures
contract, the Fund incurs an obligation to deliver the specified amount of the
underlying obligation at a specified time in return for an agreed upon price.
 
    A futures contract purchaser incurs an obligation to take delivery of a
specified amount of the obligation underlying the contract at a specified time
in the future for a specified price. A seller of a futures contract incurs an
obligation to deliver the specified amount of the underlying obligation at a
specified time in return for an agreed upon price. The purchase of a futures
contract enables the Fund, during the term of the contract, to lock in a price
at which it may purchase a security and protect against a rise in prices pending
purchase of portfolio securities. The sale of a futures contract enables the
Fund to lock in a price at which it may sell a security and protect against
declines in the value of portfolio securities.
 
    Although most futures contracts call for actual delivery or acceptance of
securities, the contracts usually are closed out before the settlement date
without the making or taking of delivery. Index futures contracts provide for
the delivery of an amount of cash equal to a specified dollar amount times the
difference between the index value at the open or close of the last trading day
of the contract and the futures contract price. A futures contract sale is
closed out by effecting a futures contract purchase for the same aggregate
amount of the specific type of security and the same delivery date. If the sale
price exceeds the offsetting purchase price, the seller would be paid the
difference and would realize a gain. If the offsetting purchase price exceeds
the sale price, the seller would pay the difference and would realize a loss.
Similarly, a futures contract purchase is closed out by effecting a futures
contract sale for the same aggregate amount of the specific type of security and
the same delivery date. If the offsetting sale price exceeds the purchase price,
the purchaser would realize a gain, whereas if the purchase price exceeds the
offsetting sale price, the purchaser would realize a loss. There is no assurance
that the Fund will be able to enter into a closing transaction.
 
                                       6
<PAGE>
    MARGIN.  If the Fund enters into a futures contract, it is initially
required to deposit an "initial margin" of cash or U.S. Government securities or
other liquid portfolio securities ranging from approximately 2% to 5% of the
contract amount. Initial margin requirements are established by the exchanges on
which futures contracts trade and may, from time to time, change. In addition,
brokers may establish margin deposit requirements in excess of those required by
the exchanges.
 
    Initial margin in futures transactions is different from margin in
securities transactions in that initial margin does not involve the borrowing of
funds by a broker's client but is, rather, a good faith deposit on the futures
contract which will be returned to the Fund upon the proper termination of the
futures contract. The margin deposits made are marked to market daily and the
Fund may be required to make subsequent deposits of cash or U.S. Government
securities, called "variation margin," which are reflective of price
fluctuations in the futures contract.
 
    OPTIONS ON FUTURES CONTRACTS.  The Fund may purchase and write call and put
options on futures contracts and enter into closing transactions with respect to
such options to terminate an existing position. An option on a futures contract
gives the purchaser the right (in return for the premium paid), and the writer
the obligation, to assume a position in a futures contract (a long position if
the option is a call and a short position if the option is a put) at a specified
exercise price at any time during the term of the option. Upon exercise of the
option, the delivery of the futures position by the writer of the option to the
holder of the option is accompanied by delivery of the accumulated balance in
the writer's futures margin account, which represents the amount by which the
market price of the futures contract at the time of exercise exceeds, in the
case of a call, or is less than, in the case of a put, the exercise price of the
option on the futures contract.
 
    The writer of an option on a futures contract is required to deposit initial
and variation margin pursuant to requirements similar to those applicable to
futures contracts. Premiums received from the writing of an option on a futures
contract are included in initial margin deposits.
 
    LIMITATIONS ON FUTURES CONTRACTS AND OPTIONS ON FUTURES.  The Fund may not
enter into futures contracts or purchase related options thereon if, immediately
thereafter, the amount committed to margin plus the amount paid for premiums for
unexpired options on futures contracts exceeds 5% of the value of the Fund's
total assets, after taking into account unrealized gains and unrealized losses
on such contracts it has entered into, provided, however, that in the case of an
option that is in-the-money (the exercise price of the call (put) option is less
(more) than the market price of the underlying security) at the time of
purchase, the in-the-money amount may be excluded in calculating the 5%.
However, there is no overall limitation on the percentage of the Fund's net
assets which may be subject to a hedge position.
 
    RISKS OF TRANSACTIONS IN FUTURES CONTRACTS AND RELATED OPTIONS.  The prices
of securities and indexes subject to futures contracts (and thereby the futures
contract prices) may correlate imperfectly with the behavior of the cash prices
of the Fund's portfolio securities. Also, prices of futures contracts may not
move in tandem with the changes in prevailing interest rates and/or market
movements against which the Fund seeks a hedge. A correlation may also be
distorted (a) temporarily, by short-term traders' seeking to profit from the
difference between a contract or security price objective and their cost of
borrowed funds; (b) by investors in futures contracts electing to close out
their contracts through offsetting transactions rather than meet margin deposit
requirements; (c) by investors in futures contracts opting to make or take
delivery of underlying securities rather than engage in closing transactions,
thereby reducing liquidity of the futures market; and (d) temporarily, by
speculators who view the deposit requirements in the futures markets as less
onerous than margin requirements in the cash market. Due to the possibility of
price distortion in the futures market and because of the possible imperfect
correlation between movements in the prices of securities and movements in the
prices of futures contracts, a correct forecast of interest rate and/or market
movement trends by the Investment Manager may still not result in a successful
hedging transaction.
 
    There is no assurance that a liquid secondary market will exist for futures
contracts and related options in which the Fund may invest. In the event a
liquid market does not exist, it may not be possible to close out a futures
position and, in the event of adverse price movements, the Fund would continue
to
 
                                       7
<PAGE>
be required to make daily cash payments of variation margin. In addition,
limitations imposed by an exchange or board of trade on which futures contracts
are traded may compel or prevent the Fund from closing out a contract which may
result in reduced gain or increased loss to the Fund. The absence of a liquid
market in futures contracts might cause the Fund to make or take delivery of the
underlying securities at a time when it may be disadvantageous to do so.
 
    Exchanges limit the amount by which the price of a futures contract may move
on any day. If the price moves equal the daily limit on successive days, then it
may prove impossible to liquidate a futures position until the daily limit moves
have ceased. In the event of adverse price movements, the Fund would continue to
be required to make daily cash payments of variation margin on open futures
positions. In these situations, if the Fund has insufficient cash, it may have
to sell portfolio securities to meet daily variation margin requirements at a
time when it may be disadvantageous to do so. In addition, the Fund may be
required to take or make delivery of the instruments underlying interest rate
futures contracts it holds at a time when it is disadvantageous to do so. The
inability to close out options and futures positions could also have an adverse
impact on the Fund's ability to effectively hedge its portfolio.
 
    Futures contracts and options thereon which are purchased or sold on foreign
commodities exchanges may have greater price volatility than their U.S.
counterparts. Furthermore, foreign commodities exchanges may be less regulated
and under less governmental scrutiny than U.S. exchanges. Brokerage commissions,
clearing costs and other transaction costs may be higher on foreign exchanges.
Greater margin requirements may limit the Fund's ability to enter into certain
commodity transactions on foreign exchanges. Moreover, differences in clearance
and delivery requirements on foreign exchanges may occasion delays in the
settlement of the Fund's transactions effected on foreign exchanges.
 
    In the event of the bankruptcy of a broker through which the Fund engages in
transactions in futures or options thereon, the Fund could experience delays
and/or losses in liquidating open positions purchased or sold through the broker
and/or incur a loss of all or part of its margin deposits with the broker.
 
   
    MONEY MARKET SECURITIES.  In addition to the short-term fixed-income
securities in which the Fund may otherwise invest, the Fund may invest in
various money market securities for cash management purposes or when assuming a
temporary defensive position, which among others may include commercial paper,
bank acceptances, bank obligations, corporate debt securities, certificates of
deposit, U.S. Government securities and obligations of savings institutions.
Such securities are limited to:
    
 
    U.S. GOVERNMENT SECURITIES.  Obligations issued or guaranteed as to
principal and interest by the United States or its agencies (such as the
Export-Import Bank of the United States. Federal Housing Administration and
Government National Mortgage Association) or its instrumentalities (such as the
Federal Home Loan Bank), including Treasury bills, notes and bonds;
 
    BANK OBLIGATIONS.  Obligations (including certificates of deposit, time
deposits and bankers' acceptances) of banks subject to regulation by the U.S.
Government and having total assets of $1 billion or more, and instruments
secured by such obligations, not including obligations of foreign branches of
domestic banks except to the extent below;
 
    EURODOLLAR CERTIFICATES OF DEPOSIT.  Eurodollar certificates of deposit
issued by foreign branches of domestic banks having total assets of $1 billion
or more;
 
    OBLIGATIONS OF SAVINGS INSTITUTIONS.  Certificates of deposit of savings
banks and savings and loan associations, having total assets of $1 billion or
more;
 
    FULLY INSURED CERTIFICATES OF DEPOSIT.  Certificates of deposit of banks and
savings institutions, having total assets of less than $1 billion, if the
principal amount of the obligation is federally insured by
 
                                       8
<PAGE>
the Bank Insurance Fund or the Savings Association Insurance Fund (each or which
is administered by the FDIC), limited to $100,000 principal amount per
certificate and to 10% or less of the Fund's total assets in all such
obligations and in all illiquid assets in the aggregate; and
 
    COMMERCIAL PAPER.  Commercial paper rated within the two highest grades by
Standard & Poor's Corporation ("S&P") or the two highest grades by Moody's
Investors Service, Inc. ("Moody's") or, if not rated, issued by a company having
an outstanding debt issue rated at least AA by S&P or Aa by Moody's.
 
    REPURCHASE AGREEMENTS.  The Fund may invest in repurchase agreements. When
cash may be available for only a few days, it may be invested by the Fund in
repurchase agreements until such time as it may otherwise be invested or used
for payments of obligations of the Fund. These agreements, which may be viewed
as a type of secured lending by the Fund, typically involve the acquisition by
the Fund of debt securities from a selling financial institution such as a bank,
savings and loan association or broker-dealer. The agreement provides that the
Fund will sell back to the institution, and that the institution will
repurchase, the underlying security serving as collateral at a specified price
and at a fixed time in the future, usually not more than seven days from the
date of purchase. The collateral will be marked-to-market daily to determine
that the value of the collateral, as specified in the agreement, does not
decrease below the purchase price plus accrued interest. If such decrease
occurs, additional collateral will be requested and, when received, added to the
account to maintain full collateralization. The Fund will accrue interest from
the institution until the time when the repurchase is to occur. Although this
date is deemed by the Fund to be the maturity date of a repurchase agreement,
the maturities of securities subject to repurchase agreements are not subject to
any limits.
 
    While repurchase agreements involve certain risks not associated with direct
investments in debt securities, the Fund follows procedures designed to minimize
such risks. These procedures include effecting repurchase transactions only with
large, well-capitalized and well-established financial institutions whose
financial condition will be continually monitored by the Investment Manager
subject to procedures established by the Trustees. In addition, as described
above, the value of the collateral underlying the repurchase agreement will be
at least equal to the repurchase price, including any accrued interest earned on
the repurchase agreement. In the event of a default or bankruptcy by a selling
financial institution, the Fund will seek to liquidate such collateral. However,
the exercising of the Fund's right to liquidate such collateral could involve
certain costs or delays and, to the extent that proceeds from any sale upon a
default of the obligation to repurchase were less than the repurchase price, the
Fund could suffer a loss.
 
    REVERSE REPURCHASE AGREEMENTS AND DOLLAR ROLLS.  For purposes other than
meeting redemptions, the Fund may invest up to 10% of its total assets in
reverse repurchase agreements and dollar rolls.
 
    Reverse repurchase agreements involve sales by the Fund of portfolio assets
concurrently with an agreement by the Fund to repurchase the same assets at a
later date at a fixed price. Generally, the effect of such a transaction is that
the Fund can recover all or most of the cash invested in the portfolio
securities involved during the term of the reverse repurchase agreement, while
it will be able to keep the interest income associated with those portfolio
securities.
 
    The Fund may enter into dollar rolls in which the Fund sells securities for
delivery in the current month and simultaneously contracts to repurchase
substantially similar (same type and coupon) securities on a specified future
date. The Fund is compensated by the difference between the current sales price
and the lower forward price for the future purchase (often referred to as the
"drop") as well as by the interest earned on the cash proceeds of the initial
sale.
 
    The Fund will establish a segregated account in which it will maintain cash,
U.S. Government securities or other liquid portfolio securities equal in value
to its obligations in respect of reverse repurchase agreements and dollar rolls.
Reverse repurchase agreements and dollar rolls involve the risk that the market
value of the securities the Fund is obligated to repurchase under the agreement
may decline below the repurchase price. In the event the buyer of securities
under a reverse repurchase
 
                                       9
<PAGE>
agreement or dollar roll files for bankruptcy or becomes insolvent, the Fund's
use of the proceeds of the agreement may be restricted pending a determination
by the other party, or its trustee or receiver, whether to enforce the Fund's
obligation to repurchase the securities. Reverse repurchase agreements and
dollar rolls are speculative techniques involving leverage, and are considered
borrowings by the Fund.
 
    LEVERAGING.  The Fund may borrow money, but only from a bank and in an
amount up to 25% of the value of the Fund's total assets taken at the lower of
market value or cost, not including the amount borrowed, in an effort to obtain
additional income by leveraging its investments through purchasing securities
with the borrowed funds. These borrowings will be subject to current margin
requirements of the Federal Reserve Board and where necessary the Fund may use
any or all of its securities as collateral for such borrowings. Any investment
gains made with the additional monies in excess of interest paid will cause the
net asset value of the Fund's shares to rise to a greater extent than would
otherwise be the case. Conversely, if the investment performance of the
additional monies fails to cover their cost to the Fund, net asset value will
decrease to a greater extent than would otherwise be the case. This is the
speculative factor involved in leverage.
 
    The investment policy provides that the Fund may not purchase or sell a
security on margin. The margin and bank borrowing restrictions will prevent the
ordinary purchase of a security which involves a cash borrowing from a broker of
any part of the purchase price of a security.
 
    The Fund may also borrow from banks as a temporary measure for extraordinary
or emergency purposes, and for these purposes and leveraging combined, in no
event an amount greater than 25% of the value of the Fund's total assets.
 
    LENDING PORTFOLIO SECURITIES.  The Fund may lend its portfolio securities to
brokers, dealers and other financial institutions, provided that the loans are
callable at any time by the Fund, and are at all times secured by cash or cash
equivalents, which are maintained in a segregated account pursuant to applicable
regulations and that are equal to at least 100% of the market value, determined
daily, of the loaned securities. The advantage of these loans is that the Fund
continues to receive the income on the loaned securities while at the same time
earning interest on the cash amounts deposited as collateral, which will be
invested in short-term obligations. The Fund will not lend more than 25% of the
value of its net assets.
 
    As with any extensions of credit, there are risks of delay in recovery and,
in some cases, even loss of rights in the collateral should the borrower of the
securities fail financially. However, these loans of portfolio securities will
only be made to firms deemed by the Fund's management to be creditworthy and
when the income which can be earned from such loans justifies the attendant
risks. Upon termination of the loan, the borrower is required to return the
securities to the Fund. Any gain or loss in the market price during the loan
period would inure to the Fund.
 
    When voting or consent rights which accompany loaned securities pass to the
borrower, the Fund will follow the policy of calling the loaned securities, to
be delivered within one day after notice, to permit the exercise of the rights
if the matters involved would have a material effect on the Fund's investment in
the loaned securities. The Fund will pay reasonable finder's, administrative and
custodial fees in connection with a loan of its securities.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From
time to time the Fund may purchase securities on a when-issued or delayed
delivery basis or may purchase or sell securities on a forward commitment basis.
When these transactions are negotiated, the price is fixed at the time of the
commitment, but delivery and payment can take place a month or more after the
date of commitment. While the Fund will only purchase securities on a
when-issued, delayed delivery or forward commitment basis with the intention of
acquiring the securities, the Fund may sell the securities before the settlement
date, if it is deemed advisable. The securities so purchased or sold are subject
to market fluctuation and no interest or dividends accrue to the purchaser prior
to the settlement date.
 
                                       10
<PAGE>
    At the time the Fund makes the commitment to purchase or sell securities on
a when-issued, delayed delivery or forward commitment basis, it will record the
transaction and thereafter reflect the value, each day, of such security
purchased, or if a sale, the proceeds to be received, in determining its net
asset value. At the time of delivery of the securities, their value may be more
or less than the purchase or sale price. An increase in the percentage of the
Fund's assets committed to the purchase of securities on a when-issued, delayed
delivery or forward commitment basis may increase the volatility of its net
asset value. The Fund will also establish a segregated account on the Fund's
books in which it will continually maintain cash or cash equivalents or other
liquid portfolio securities equal in value to commitments to purchase securities
on a when-issued, delayed delivery or forward commitment basis.
 
    YEAR 2000.  The investment management services provided to the Fund by the
Investment Manager and the services provided to shareholders by the Distributor
and the Transfer Agent depend on the smooth functioning of their computer
systems. Many computer software systems in use today cannot recognize the year
2000, but revert to 1900 or some other date, due to the manner in which dates
were encoded and calculated. That failure could have a negative impact on the
handling of securities trades, pricing and account services. The Investment
Manager, the Distributor and the Transfer Agent have been actively working on
necessary changes to their own computer systems to prepare for the year 2000 and
expect that their systems will be adapted before that date, but there can be no
assurance that they will be successful, or that interaction with other
non-complying computer systems will not impair their services at that time.
 
    In addition, it is possible that the markets for securities in which the
Fund invests may be detrimentally affected by computer failures throughout the
financial services industry beginning January 1, 2000. Improperly functioning
trading systems may result in settlement problems and liquidity issues. In
addition, corporate and governmental data processing errors may result in
production problems for individual companies and overall economic uncertainties.
Earnings of individual issuers will be affected by remediation costs, which may
be substantial and may be reported inconsistently in U.S. and foreign financial
statements. Accordingly, the Fund's investments may be adversely affected.
 
C. FUND POLICIES/INVESTMENT RESTRICTIONS
 
   
    The investment objective, policies and restrictions listed below have been
adopted by the Fund as fundamental policies. Under the Investment Company Act of
1940 (the "Investment Company Act"), a fundamental policy may not be changed
without the vote of a majority of the outstanding voting securities of the Fund.
The Investment Company Act defines a majority as the lesser of (a) 67% or more
of the shares present at a meeting of shareholders, if the holders of 50% of the
outstanding shares of the Fund are present or represented by proxy; or (b) more
than 50% of the outstanding shares of the Fund. For purposes of the following
restrictions: (i) all percentage limitations apply immediately after a purchase
or initial investment; and (ii) any subsequent change in any applicable
percentage resulting from market fluctuations or other changes in total or net
assets does not require elimination of any security from the portfolio.
    
 
   
    The Fund will:
    
 
   
         1.  Seek a high level of current income.
    
 
    The Fund may not:
 
         1.  Invest more than 5% of the value of its total assets in the
    securities of any one issuer (other than obligations issued, or guaranteed
    by, the United States Government, its agencies or instrumentalities).
 
         2.  Purchase more than 10% of all outstanding voting securities or any
    class of securities of any one issuer.
 
         3.  Invest more than 25% of the value of its total assets in securities
    of issuers in any one industry. This restriction does not apply to
    obligations issued or guaranteed by the United States Government, its
    agencies or instrumentalities.
 
                                       11
<PAGE>
         4.  Invest in securities of any issuer if, to the knowledge of the
    Fund, any officer or trustee of the Fund or of the Investment Manager owns
    more than 1/2 of 1% of the outstanding securities of the issuer, and the
    officers and trustees who own more than 1/2 of 1% own in the aggregate more
    than 5% of the outstanding securities of the issuer.
 
         5.  Purchase or sell real estate or interests therein, although the
    Fund may purchase securities of issuers which engage in real estate
    operations and securities secured by real estate or interests therein.
 
         6.  Purchase or sell commodities or commodities contracts except that
    the Fund may purchase or sell (write) interest rate futures contracts and
    related options thereon.
 
         7.  Borrow money, except from banks for investment purposes or as a
    temporary measure for extraordinary or emergency purposes in an amount up to
    25% of the Fund's total assets, within the limits set forth in the
    Investment Company Act or enter into reverse repurchase agreements in an
    amount exceeding 10% of the Fund's total assets other than for purposes of
    meeting redemptions.
 
         8.  Pledge its assets or assign or otherwise encumber them, except to
    secure permitted borrowings. For the purpose of this restriction, collateral
    arrangements with respect to the writing of options and collateral
    arrangements with respect to initial or variation margin for futures are not
    deemed to be pledges of assets.
 
         9.  Issue senior securities as defined in the Investment Company Act,
    except insofar as the Fund may be deemed to have issued a senior security by
    reason of: (a) entering into any reverse repurchase agreement; (b) borrowing
    money; or (c) purchasing any securities on a when-issued, delayed delivery
    or forward commitment basis.
 
        10.  Make loans of money or securities, except: (a) by the purchase of
    publicly distributed debt obligations; (b) by investment in repurchase or
    reverse purchase agreements; or (c) by lending its portfolio securities.
 
        11.  Make short sales of securities or maintain a short position, unless
    at all times when a short position is open it owns an equal amount of such
    securities or securities convertible into or exchangeable, without payment
    of any further consideration, for securities of the same issue as, and equal
    in amount to, the securities sold short, and unless not more than 10% of the
    Fund's net assets (taken at market value) is held as collateral for such
    sales at any one time.
 
        12.  Purchase securities on margin, except short-term loans as are
    necessary for the clearance of portfolio securities. The deposit or payment
    by the Fund of initial or variation margin in connection with futures
    contracts or related options thereon is not considered the purchase of a
    security on margin.
 
        13.  Engage in the underwriting of securities, except insofar as the
    Fund may be deemed an underwriter under the Securities Act in disposing of a
    portfolio security.
 
        14.  Invest for the purpose of exercising control or management of any
    other issuer.
 
        15.  Invest more than 10% of its total assets in "illiquid securities"
    (securities for which market quotations are not readily available) and
    repurchase agreements which have a maturity of longer than seven days.
 
        16.  Invest more than 5% of the value of its total assets in securities
    of issuers having a record, together with predecessors, of less than 3 years
    of continuous operation. This restriction shall not apply to any obligation
    of the United States Government, its agencies or instrumentalities.
 
        17.  Purchase oil, gas or other mineral leases, rights or royalty
    contracts, or exploration or development programs, except that the Fund may
    invest in the securities of companies which operate, invest in, or sponsor
    these programs.
 
                                       12
<PAGE>
        18.  Purchase securities of other investment companies, except in
    connection with a merger, consolidation, reorganization or acquisition of
    assets.
 
    If a percentage restriction is adhered to at the time of investment, a later
increase or decrease in percentage resulting from a change in values of
portfolio securities or amount of total or net assets will not be considered a
violation of any of the foregoing restrictions.
 
    Notwithstanding any other investment policy or restriction, the Fund may
seek to achieve its investment objective by investing all or substantially all
of its assets in another investment company having substantially the same
investment objective and policies as the Fund.
 
III. MANAGEMENT OF THE FUND
- --------------------------------------------------------------------------------
 
A. BOARD OF TRUSTEES
 
    The Board of Trustees of the Fund oversees the management of the Fund but
does not itself manage the Fund. The Trustees review various services provided
by or under the direction of the Investment Manager to ensure that the Fund's
general investment policies and programs are properly carried out. The Trustees
also conduct their review to ensure that administrative services are provided to
the Fund in a satisfactory manner.
 
    Under state law, the duties of the Trustees are generally characterized as a
duty of loyalty and a duty of care. The duty of loyalty requires a Trustee to
exercise his or her powers in the interest of the Fund and not the Trustee's own
interest or the interest of another person or organization. A Trustee satisfies
his or her duty of care by acting in good faith with the care of an ordinarily
prudent person and in a manner the Trustee reasonably believes to be in the best
interest of the Fund and its shareholders.
 
B. MANAGEMENT INFORMATION
 
    TRUSTEES AND OFFICERS.  The Board of the Fund consists of nine (9) Trustees.
These same individuals also serve as directors or trustees for all of the Morgan
Stanley Dean Witter Funds. Seven Trustees (77% of the total number) have no
affiliation or business connection with the Investment Manager or any of its
affiliated persons and do not own any stock or other securities issued by the
Investment Manager's parent company, MSDW. These are the "non-interested" or
"independent" Trustees. The other two Trustees (the "management Trustees") are
affiliated with the Investment Manager. All of the Independent Trustees also
serve as Independent Trustees of "Discover Brokerage Index Series," a mutual
fund for which the Investment Manager is the investment advisor. Four of the
seven Independent Trustees are also Independent Trustees of certain other mutual
funds, referred to as the "TCW/DW Funds," for which MSDW Services Company is the
manager and TCW Funds Management, Inc. is the investment advisor.
 
   
    The Trustees and executive officers of the Fund, their principal business
occupations during the last five years and their affiliations, if any, with the
Investment Manager, and with the 84 Morgan Stanley Dean Witter Funds, the 11
TCW/DW Funds and Discover Brokerage Index Series, are shown below.
    
 
<TABLE>
<CAPTION>
  NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------------  ------------------------------------------------------------------
<S>                                             <C>
Michael Bozic (58) ...........................  Vice Chairman of Kmart Corporation (since December, 1998);
Trustee                                         Director or Trustee of the Morgan Stanley Dean Witter Funds;
c/o Kmart Corporation                           Trustee of Discover Brokerage Index Series; formerly Chairman and
3100 West Big Beaver Road                       Chief Executive Officer of Levitz Furniture Corporation (November,
Troy, Michigan                                  1995-November, 1998) and President and Chief Executive Officer of
                                                Hills Department Stores (May, 1991-July, 1995); formerly variously
                                                Chairman, Chief Executive Officer, President and Chief Operating
                                                Officer (1987-1991) of the Sears Merchandise Group of Sears,
                                                Roebuck and Co.; Director of Eaglemark Financial Services, Inc.
                                                and Weirton Steel Corporation.
</TABLE>
 
                                       13
<PAGE>
   
<TABLE>
<CAPTION>
  NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------------  ------------------------------------------------------------------
<S>                                             <C>
Charles A. Fiumefreddo* (65) .................  Chairman, Director or Trustee, President and Chief Executive
Chairman of the Board, President,               Officer of the Morgan Stanley Dean Witter Funds; Chairman, Chief
Chief Executive Officer and Trustee             Executive Officer and Trustee of the TCW/DW Funds; Trustee of
Two World Trade Center                          Discover Brokerage Index Series; formerly Chairman, Chief
New York, New York                              Executive Officer and Director of the Investment Manager, the
                                                Distributor and MSDW Services Company; Executive Vice President
                                                and Director of Dean Witter Reynolds; Chairman and Director of the
                                                Transfer Agent; formerly Director and/or officer of various MSDW
                                                subsidiaries (until June, 1998).
 
Edwin J. Garn (66) ...........................  Director or Trustee of the Morgan Stanley Dean Witter Funds;
Trustee                                         Trustee of Discover Brokerage Index Series; formerly United States
c/o Huntsman Corporation                        Senator (R-Utah)(1974-1992) and Chairman, Senate Banking Committee
500 Huntsman Way                                (1980-1986); formerly Mayor of Salt Lake City, Utah (1971-1974);
Salt Lake City, Utah                            formerly Astronaut, Space Shuttle Discovery (April 12-19, 1985);
                                                Vice Chairman, Huntsman Corporation; Director of Franklin Covey
                                                (time management systems), John Alden Financial Corp. (health
                                                insurance), United Space Alliance (joint venture between Lockheed
                                                Martin and the Boeing Company) and Nuskin Asia Pacific (multilevel
                                                marketing); member of the board of various civic and charitable
                                                organizations.
 
John R. Haire (74) ...........................  Chairman of the Audit Committee and Director or Trustee of the
Trustee                                         Morgan Stanley Dean Witter Funds; Chairman of the Audit Committee
Two World Trade Center                          and Trustee of the TCW/DW Funds; Chairman of the Audit Committee
New York, New York                              and Trustee of Discover Brokerage Index Series; formerly Chairman
                                                of the Independent Directors or Trustees of the Morgan Stanley
                                                Dean Witter Funds and the TCW/DW Funds (until June, 1998);
                                                formerly President, Council for Aid to Education (1978-1989) and
                                                Chairman and Chief Executive Officer of Anchor Corporation, an
                                                investment advisor (1964-1978).
 
Wayne E. Hedien (65) .........................  Retired; Director or Trustee of the Morgan Stanley Dean Witter
Trustee                                         Funds; Trustee of Discover Brokerage Index Series; Director of The
c/o Gordon Altman Butowsky                      PMI Group, Inc. (private mortgage insurance); Trustee and Vice
Weitzen Shalov & Wein                           Chairman of The Field Museum of Natural History; formerly
Counsel to the Independent Trustees             associated with the Allstate Companies (1966-1994), most recently
114 West 47th Street                            as Chairman of The Allstate Corporation (March, 1993-December,
New York, New York                              1994) and Chairman and Chief Executive Officer of its wholly-owned
                                                subsidiary, Allstate Insurance Company (July, 1989-December,
                                                1994); director of various other business and charitable
                                                organizations.
</TABLE>
    
 
                                       14
<PAGE>
   
<TABLE>
<CAPTION>
  NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------------  ------------------------------------------------------------------
<S>                                             <C>
Dr. Manuel H. Johnson (50) ...................  Senior Partner, Johnson Smick International, Inc., a consulting
Trustee                                         firm; Co-Chairman and a founder of the Group of Seven Council
c/o Johnson Smick International, Inc.           (G7C), an international economic commission; Director or Trustee
1133 Connecticut Avenue, N.W.                   of the Morgan Stanley Dean Witter Funds; Trustee of the TCW/DW
Washington, D.C.                                Funds; Trustee of Discover Brokerage Index Series; Director of
                                                NASDAQ (since June, 1995); Director of Greenwich Capital Markets,
                                                Inc. (broker-dealer) and NVR, Inc. (home construction); Chairman
                                                and Trustee of the Financial Accounting Foundation (oversight
                                                organization of the Financial Accounting Standards Board);
                                                formerly Vice Chairman of the Board of Governors of the Federal
                                                Reserve System (1986-1990) and Assistant Secretary of the U.S.
                                                Treasury.
 
Michael E. Nugent (62) .......................  General Partner, Triumph Capital, L.P., a private investment
Trustee                                         partnership; Director or Trustee of the Morgan Stanley Dean Witter
c/o Triumph Capital, L.P.                       Funds; Trustee of the TCW/DW Funds; Trustee of Discover Brokerage
237 Park Avenue                                 Index Series; formerly Vice President, Bankers Trust Company and
New York, New York                              BT Capital Corporation (1984-1988); director of various business
                                                organizations.
 
Philip J. Purcell* (55) ......................  Chairman of the Board of Directors and Chief Executive Officer of
Trustee                                         MSDW, Dean Witter Reynolds and Novus Credit Services Inc.;
1585 Broadway                                   Director of the Distributor; Director or Trustee of the Morgan
New York, New York                              Stanley Dean Witter Funds; Trustee of Discover Brokerage Index
                                                Series; Director and/or officer of various MSDW subsidiaries.
 
John L. Schroeder (68) .......................  Retired; Director or Trustee of the Morgan Stanley Dean Witter
Trustee                                         Funds; Trustee of the TCW/DW Funds; Trustee of Discover Brokerage
c/o Gordon Altman Butowsky                      Index Series; Director of Citizens Utilities Company; formerly
Weitzen Shalov & Wein                           Executive Vice President and Chief Investment Officer of the Home
Counsel to the Independent Trustees             Insurance Company (August, 1991-September, 1995).
114 West 47th Street
New York, New York
 
Barry Fink (44) ..............................  Senior Vice President (since March, 1997) and Secretary and
Vice President,                                 General Counsel (since February, 1997) and Director (since July,
Secretary and General Counsel                   1998) of the Investment Manager and MSDW Services Company; Senior
Two World Trade Center                          Vice President (since March, 1997) and Assistant Secretary and
New York, New York                              Assistant General Counsel (since February, 1997) of the
                                                Distributor; Assistant Secretary of Dean Witter Reynolds (since
                                                August, 1996); Vice President, Secretary and General Counsel of
                                                the Morgan Stanley Dean Witter Funds and the TCW/DW Funds (since
                                                February, 1997); Vice President, Secretary and General Counsel of
                                                Discover Brokerage Index Series; previously First Vice President
                                                (June, 1993-February, 1997), Vice President and Assistant
                                                Secretary and Assistant General Counsel of the Investment Manager
                                                and MSDW Services Company and Assistant Secretary of the Morgan
                                                Stanley Dean Witter Funds and the TCW/DW Funds.
</TABLE>
    
 
                                       15
<PAGE>
   
<TABLE>
<CAPTION>
  NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------------  ------------------------------------------------------------------
<S>                                             <C>
Rajesh K. Gupta (38) .........................  Senior Vice President of the Investment Manager; Vice President of
Vice President                                  various Morgan Stanley Dean Witter Funds.
Two World Trade Center
New York, New York
 
Howard A. Schloss (42) .......................  Vice President of the Investment Manager.
Vice President
Two World Trade Center
New York, New York
 
Thomas F. Caloia (52) ........................  First Vice President and Assistant Treasurer of the Investment
Treasurer                                       Manager and MSDW Services Company; Treasurer of the Morgan Stanley
Two World Trade Center                          Dean Witter Funds, the TCW/DW Funds and Discover Brokerage Index
New York, New York                              Series.
</TABLE>
    
 
- ------------
*Denotes Trustees who are "interested persons" of the Fund as defined by the
Investment Company Act.
 
   
    In addition, MITCHELL M. MERIN, President and Chief Operating Officer of
Asset Management of MSDW, President, Chief Executive Officer and Director of the
Investment Manager and MSDW Services Company, Chairman and Director of the
Distributor and the Transfer Agent, Executive Vice President and Director of
DWR, and Director of various MSDW subsidiaries, RONALD E. ROBISON, Executive
Vice President, Chief Administrative Officer and Director of the Investment
Manager and MSDW Services Company, ROBERT S. GIAMBRONE, Senior Vice President of
the Investment Manager, MSDW Services Company, the Distributor and the Transfer
Agent and Director of the Transfer Agent, and JOSEPH J. MCALINDEN, Executive
Vice President and Chief Investment Officer of the Investment Manager and
Director of the Transfer Agent, and KENTON J. HINCHLIFFE, JONATHAN R. PAGE and
JAMES F. WILLISON, Senior Vice Presidents of the Investment Manager, are Vice
Presidents of the Fund.
    
 
   
    In addition, FRANK BRUTTOMESSO, MARILYN K. CRANNEY, LOU ANNE D. MCINNIS,
CARSTEN OTTO and RUTH ROSSI, First Vice Presidents and Assistant General
Counsels of the Investment Manager and MSDW Services Company, and TODD LEBO,
Vice President and Assistant General Counsel of the Investment Manager and MSDW
Services Company, are Assistant Secretaries of the Fund.
    
 
   
    INDEPENDENT TRUSTEES AND THE COMMITTEES.  Law and regulation establish both
general guidelines and specific duties for the Independent Trustees. The Morgan
Stanley Dean Witter Funds seek as Independent Trustees individuals of
distinction and experience in business and finance, government service or
academia; these are people whose advice and counsel are in demand by others and
for whom there is often competition. To accept a position on the Funds' Boards,
such individuals may reject other attractive assignments because the Funds make
substantial demands on their time. Indeed, by serving on the Funds' Boards,
certain Trustees who would otherwise be qualified and in demand to serve on bank
boards would be prohibited by law from doing so. All of the Independent Trustees
serve as members of the Audit Committee. In addition, three of the Trustees,
including two Independent Trustees, serve as members of the Derivatives
Committee and the Insurance Committee.
    
 
   
    The Independent Trustees are charged with recommending to the full Board
approval of man-agement, advisory and administration contracts, Rule 12b-1 plans
and distribution and underwriting agreements; continually reviewing Fund
performance; checking on the pricing of portfolio securities, brokerage
commissions, transfer agent costs and performance, and trading among Funds in
the same complex; and approving fidelity bond and related insurance coverage and
allocations, as well as other matters that arise from time to time. The
Independent Trustees are required to select and nominate individuals to fill any
Independent Trustee vacancy on the Board of any Fund that has a Rule 12b-1 plan
of distribution. Most of the Morgan Stanley Dean Witter Funds have a Rule 12b-1
plan.
    
 
                                       16
<PAGE>
    The Audit Committee is charged with recommending to the full Board the
engagement or discharge of the Fund's independent accountants; directing
investigations into matters within the scope of the independent accountants'
duties, including the power to retain outside specialists; re-viewing with the
independent accountants the audit plan and results of the auditing engagement;
approving professional services provided by the independent accountants and
other accounting firms prior to the performance of the services; reviewing the
independence of the independent ac-countants; considering the range of audit and
non-audit fees; reviewing the adequacy of the Fund's system of internal
controls; and preparing and submitting Committee meeting minutes to the full
Board.
 
    The Board of each Fund has a Derivatives Committee to approve parameters for
and monitor the activities of the Fund with respect to derivative investments,
if any, made by the Fund.
 
    Finally, the Board of each Fund has formed an Insurance Committee to review
and monitor the insurance coverage maintained by the Fund.
 
    ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT TRUSTEES FOR ALL MORGAN
STANLEY DEAN WITTER FUNDS.  The Independent Trustees and the Funds' management
believe that having the same Independent Trustees for each of the Morgan Stanley
Dean Witter Funds avoids the duplication of effort that would arise from having
different groups of individuals serving as Independent Trustees for each of the
Funds or even of sub-groups of Funds. They believe that having the same
individuals serve as Independent Trustees of all the Funds tends to increase
their knowledge and expertise regarding matters which affect the Fund complex
generally and enhances their ability to negotiate on behalf of each Fund with
the Fund's service providers. This arrangement also precludes the possibility of
separate groups of Independent Trustees arriving at conflicting decisions
regarding operations and management of the Funds and avoids the cost and
confusion that would likely ensue. Finally, having the same Independent Trustees
serve on all Fund Boards enhances the ability of each Fund to obtain, at modest
cost to each separate Fund, the services of Independent Trustees, of the
caliber, experience and business acumen of the individuals who serve as
Independent Trustees of the Morgan Stanley Dean Witter Funds.
 
    TRUSTEE AND OFFICER INDEMNIFICATION.  The Fund's Declaration of Trust
provides that no Trustee, officer, employee or agent of the Fund is liable to
the Fund or to a shareholder, nor is any Trustee, officer, employee or agent
liable to any third persons in connection with the affairs of the Fund, except
as such liability may arise from his/her or its own bad faith, willful
misfeasance, gross negligence or reckless disregard of his/her or its duties. It
also provides that all third persons shall look solely to the Fund property for
satisfaction of claims arising in connection with the affairs of the Fund. With
the exceptions stated, the Declaration of Trust provides that a Trustee,
officer, employee or agent is entitled to be indemnified against all liability
in connection with the affairs of the Fund.
 
C. COMPENSATION
 
   
    The Fund pays each Independent Trustee an annual fee of $800 plus a per
meeting fee of $50 for meetings of the Board of Trustees, the Independent
Trustees or Committees of the Board of Trustees attended by the Trustee (the
Fund pays the Chairman of the Audit Committee an additional annual fee of $750).
If a Board meeting and a meeting of the Independent Trustees or a Committee
meeting, or a meeting of the Independent Trustees and/or more than one Committee
meeting, take place on a single day, the Trustees are paid a single meeting fee
by the Fund. The Fund also reimburses such Trustees for travel and other
out-of-pocket expenses incurred by them in connection with attending such
meetings. Trustees and officers of the Fund who are or have been employed by the
Investment Manager or an affiliated company receive no compensation or expenses
reimbursed from the Fund for their services as Trustee. Mr. Haire currently
serves as Chairman of the Audit Committee. Prior to June 1, 1998, Mr. Haire also
served as Chairman of the Independent Trustees, for which services the Fund paid
him an additional annual fee of $1,200.
    
 
    The following table illustrates the compensation that the Fund paid to its
Independent Trustees for the fiscal year ended October 31, 1998.
 
                                       17
<PAGE>
                               FUND COMPENSATION
 
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                      FROM THE FUND
- --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,450
Edwin J. Garn.................................................       1,600
John R. Haire.................................................       2,850
Wayne E. Hedien...............................................       1,550
Dr. Manuel H. Johnson.........................................       1,550
Michael E. Nugent.............................................       1,600
John L. Schroeder.............................................       1,600
</TABLE>
 
    The following table illustrates the compensation paid to the Fund's
Independent Trustees for the calendar year ended December 31, 1998 for services
to the 85 Morgan Stanley Dean Witter Funds and, in the case of Messrs. Haire,
Johnson, Nugent and Schroeder, the 11 TCW/DW Funds that were in operation at
December 31, 1998. Mr. Haire serves as Chairman of the Audit Committee of each
Morgan Stanley Dean Witter Fund and each TCW/DW Fund and, prior to June 1, 1998,
also served as Chairman of the Independent Directors or Trustees of those Funds.
With respect to Messrs. Haire, Johnson, Nugent and Schroeder, the TCW/DW Funds
are included solely because of a limited exchange privilege between those Funds
and five Morgan Stanley Dean Witter Money Market Funds. No compensation was paid
to the Fund's Independent Trustees by Discover Brokerage Index Series for the
calendar year ended December 31, 1998.
 
    CASH COMPENSATION FROM MORGAN STANLEY DEAN WITTER FUNDS AND TCW/DW FUNDS
 
   
<TABLE>
<CAPTION>
                                                                   FOR SERVICE AS                    TOTAL CASH
                                                                    CHAIRMAN OF      FOR SERVICE    COMPENSATION
                                                                    INDEPENDENT          AS         FOR SERVICES
                               FOR SERVICE                           DIRECTORS/      CHAIRMAN OF         TO
                              AS DIRECTOR OR                        TRUSTEES AND     INDEPENDENT      85 MORGAN
                               TRUSTEE AND       FOR SERVICE AS        AUDIT        TRUSTEES AND    STANLEY DEAN
                             COMMITTEE MEMBER     TRUSTEE AND      COMMITTEES OF        AUDIT       WITTER FUNDS
                               OF 85 MORGAN     COMMITTEE MEMBER     85 MORGAN      COMMITTEES OF      AND 11
NAME OF                        STANLEY DEAN       OF 11 TCW/DW      STANLEY DEAN      11 TCW/DW        TCW/DW
INDEPENDENT TRUSTEE            WITTER FUNDS          FUNDS          WITTER FUNDS        FUNDS           FUNDS
- ---------------------------  ----------------   ----------------   --------------   -------------   -------------
<S>                          <C>                <C>                <C>              <C>             <C>
Michael Bozic..............      $120,150           --                 --               --            $120,150
Edwin J. Garn..............       132,450           --                 --               --             132,450
John R. Haire..............       136,450           $66,931           $101,338        $ 14,725         319,444
Wayne E. Hedien............       132,350           --                 --               --             132,350
Dr. Manuel H. Johnson......       128,400            62,331            --               --             190,731
Michael E. Nugent..........       132,450            62,131            --               --             194,581
John L. Schroeder..........       132,450            64,731            --               --             197,181
</TABLE>
    
 
   
    As of the date of this STATEMENT OF ADDITIONAL INFORMATION, 55 of the Morgan
Stanley Dean Witter Funds, including the Fund, have adopted a retirement program
under which an Independent Trustee who retires after serving for at least five
years (or such lesser period as may be determined by the Board) as an
Independent Director or Trustee of any Morgan Stanley Dean Witter Fund that has
adopted the retirement program (each such Fund referred to as an "Adopting Fund"
and each such Trustee referred to as an "Eligible Trustee") is entitled to
retirement payments upon reaching the eligible retirement age (normally, after
attaining age 72). Annual payments are based upon length of service.
    
 
   
    Currently, upon retirement, each Eligible Trustee is entitled to receive
from the Adopting Fund, commencing as of his or her retirement date and
continuing for the remainder of his or her life, an annual retirement benefit
(the "Regular Benefit") equal to 30.22% of his or her Eligible Compensation plus
0.5036667% of such Eligible Compensation for each full month of service as an
Independent Director or
    
 
                                       18
<PAGE>
   
Trustee of any Adopting Fund in excess of five years up to a maximum of 60.44%
after ten years of service. The foregoing percentages may be changed by the
Board(1). "Eligible Compensation" is one-fifth of the total compensation earned
by such Eligible Trustee for service to the Adopting Fund in the five year
period prior to the date of the Eligible Trustee's retirement. Benefits under
the retirement program are not secured or funded by the Adopting Funds.
    
 
   
    The following table illustrates the retirement benefits accrued to the
Fund's Independent Trustees by the Fund for the fiscal year ended October 31,
1998 and by the 55 Morgan Stanley Dean Witter Funds (including the Fund) for the
year ended December 31, 1998, and the estimated retirement benefits for the
Independent Trustees, to commence upon their retirement, from the Fund as of
October 31, 1998 and from the 55 Morgan Stanley Dean Witter Funds as of December
31, 1998.
    
 
   RETIREMENT BENEFITS FROM THE FUND AND ALL MORGAN STANLEY DEAN WITTER FUNDS
 
   
<TABLE>
<CAPTION>
                                          FOR ALL ADOPTING FUNDS          RETIREMENT BENEFITS       ESTIMATED ANNUAL
                                     ---------------------------------    ACCRUED AS EXPENSES           BENEFITS
                                        ESTIMATED                                                  UPON RETIREMENT(2)
                                     CREDITED YEARS       ESTIMATED      ---------------------     -------------------
                                      OF SERVICE AT     PERCENTAGE OF                BY ALL          FROM     FROM ALL
                                       RETIREMENT         ELIGIBLE       BY THE     ADOPTING         THE      ADOPTING
NAME OF INDEPENDENT TRUSTEE           (MAXIMUM 10)      COMPENSATION      FUND       FUNDS           FUND      FUNDS
- -----------------------------------  ---------------   ---------------   ------   ------------     --------   --------
<S>                                  <C>               <C>               <C>      <C>              <C>        <C>
Michael Bozic......................          10             60.44%       $ 412    $     22,377      $ 1,029   $ 52,250
Edwin J. Garn......................          10             60.44          623          35,225        1,029     52,250
John R. Haire......................          10             60.44           29         (12,211)(3)    2,418    134,705
Wayne E. Hedien....................           9             51.37          654          41,979          875     44,413
Dr. Manuel H. Johnson..............          10             60.44          251          14,047        1,029     52,250
Michael E. Nugent..................          10             60.44          441          25,336        1,029     52,250
John L. Schroeder..................           8             50.37          828          45,117          861     44,343
</TABLE>
    
 
- ------------------------
   
(1)  An Eligible Trustee may elect alternative payments of his or her retirement
     benefits based upon the combined life expectancy of the Eligible Trustee
     and his or her spouse on the date of such Eligible Trustee's retirement. In
     addition, the Eligible Trustee may elect that the surviving spouse's
     periodic payment of benefits will be equal to a lower percentage of the
     periodic amount when both spouces were alive. The amount estimated to be
     payable under this method, through the remainder of the later of the lives
     of the Eligible Trustee and spouse, will be the actuarial equivalent of the
     Regular Benefit.
    
 
   
(2)  Based on current levels of compensation. Amount of annual benefits also
     varies depending on the Trustee's elections described in Footnote (1)
     above.
    
 
   
(3)  This number reflects the effect of the extension of Mr. Haire's term as
     Director or Trustee until May 1, 1999.
    
 
IV. CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES
- --------------------------------------------------------------------------------
 
   
    The following owned 5% or more of the outstanding shares of Class A on
February 9, 1999: Oak Valley Hospital, 350 S. Oak Avenue, Oakdale, CA
95361--53.972%; MSDW Trust FSB, Trustee Northeast Regional Medical Center, P.O.
Box 957, Jersey City, NJ 07303--11.284%. The following owned 5% or more of the
outstanding shares of Class C on February 9, 1999: Medical Education Resources
Inc., 1500 W. Canal Ct. #500, Littleton, CO 80120--9.035%.
    
 
    As of the date of this STATEMENT OF ADDITIONAL INFORMATION, the aggregate
number of shares of beneficial interest of the Fund owned by the Fund's officers
and Trustees as a group was less than 1% of the Fund's shares of beneficial
interest outstanding.
 
V. INVESTMENT MANAGEMENT AND OTHER SERVICES
- --------------------------------------------------------------------------------
 
A. INVESTMENT MANAGER
 
    The Investment Manager to the Fund is Morgan Stanley Dean Witter Advisors
Inc., a Delaware corporation, whose address is Two World Trade Center, New York,
New York 10048. The Investment
 
                                       19
<PAGE>
Manager is a wholly-owned subsidiary of MSDW, a Delaware corporation. MSDW is a
preeminent global financial services firm that maintains leading market
positions in each of its three primary businesses: securities, asset management
and credit services.
 
    Pursuant to an Investment Management Agreement (the "Management Agreement")
with the Investment Manager, the Fund has retained the Investment Manager to
provide administrative services and manage the investment of the Fund's assets,
including the placing of orders for the purchase and sale of portfolio
securities. The Fund pays the Investment Manager monthly compensation calculated
daily by applying the following annual rates to the Fund's daily net assets:
 
       -0.55% of the portion of the daily net assets of the Fund not
        exceeding $1 billion;
       -0.525% of the portion of the Fund's daily net assets exceeding $1
        billion but not exceeding $1.5 billion;
       -0.50% of the portion of the Fund's daily net assets exceeding
        $1.5 billion but not exceeding $2 billion;
       -0.475% of the portion of the Fund's daily net assets exceeding $2
        billion but not exceeding $2.5 billion;
       -0.45% of the portion of the Fund's daily net assets exceeding
        $2.5 billion but not exceeding $5 billion;
       -0.425% of the portion of the Fund's daily net assets exceeding $5
        billion but not exceeding $7.5 billion;
       -0.40% of the portion of the Fund's daily net assets exceeding
        $7.5 billion but not exceeding $10 billion;
       -0.375% of the portion of the Fund's daily net assets exceeding
        $10 billion but not exceeding $12.5 billion; and
       -0.35% of the portion of the Fund's daily net assets exceeding
        $12.5 billion.
 
    The management fee is allocated among the Classes pro rata based on the net
assets of the Fund attributable to each Class. For the fiscal years ended
October 31, 1996, 1997 and 1998, the Investment Manager accrued total
compensation under the Management Agreement in the amounts of $4,241,115,
$3,616,570 and $3,403,780, respectively.
 
    The Investment Manager has retained its wholly-owned subsidiary, MSDW
Services Company, to perform administrative services for the Fund.
 
B. PRINCIPAL UNDERWRITER
 
    The Fund's principal underwriter is the Distributor (which has the same
address as the Investment Manager). In this capacity, the Fund's shares are
distributed by the Distributor. The Distributor has entered into a selected
dealer agreement with Dean Witter Reynolds, which through its own sales
organization sells shares of the Fund. In addition, the Distributor may enter
into similar agreements with other selected broker-dealers. The Distributor, a
Delaware corporation, is a wholly-owned subsidiary of MSDW.
 
   
    The Distributor bears all expenses it may incur in providing services under
the Distribution Agreement. These expenses include the payment of commissions
for sales of the Fund's shares and incentive compensation to Financial Advisors.
The Distributor also pays certain expenses in connection with the distribution
of the Fund's shares, including the costs of preparing, printing and
distributing advertising or promotional materials, and the costs of printing and
distributing prospectuses and supplements thereto used in connection with the
offering and sale of the Fund's shares. The Fund bears the costs of initial
typesetting, printing and distribution of prospectuses and supplements thereto
to shareholders. The Fund also bears the costs of registering the Fund and its
shares under federal and state securities laws and pays filing fees in
accordance with state securities laws.
    
 
    The Fund and the Distributor have agreed to indemnify each other against
certain liabilities, including liabilities under the Securities Act. Under the
Distribution Agreement, the Distributor uses its best efforts in rendering
services to the Fund, but in the absence of willful misfeasance, bad faith,
gross
 
                                       20
<PAGE>
negligence or reckless disregard of its obligations, the Distributor is not
liable to the Fund or any of its shareholders for any error of judgment or
mistake of law or for any act or omission or for any losses sustained by the
Fund or its shareholders.
 
C. SERVICES PROVIDED BY THE INVESTMENT MANAGER AND FUND EXPENSES PAID BY THIRD
PARTIES
 
    The Investment Manager manages the investment of the Fund's assets,
including the placing of orders for the purchase and sale of portfolio
securities. The Investment Manager obtains and evaluates the information and
advice relating to the economy, securities markets, and specific securities as
it considers necessary or useful to continuously manage the assets of the Fund
in a manner consistent with its investment objective.
 
    Under the terms of the Management Agreement, in addition to managing the
Fund's investments, the Investment Manager maintains certain of the Fund's books
and records and furnishes, at its own expense, the office space, facilities,
equipment, clerical help, bookkeeping and certain legal services as the Fund may
reasonably require in the conduct of its business, including the preparation of
prospectuses, proxy statements and reports required to be filed with federal and
state securities commissions (except insofar as the participation or assistance
of independent accountants and attorneys is, in the opinion of the Investment
Manager, necessary or desirable). In addition, the Investment Manager pays the
salaries of all personnel, including officers of the Fund, who are employees of
the Investment Manager. The Investment Manager also bears the cost of telephone
service, heat, light, power and other utilities provided to the Fund.
 
    Expenses not expressly assumed by the Investment Manager under the
Management Agreement or by the Distributor, will be paid by the Fund. These
expenses will be allocated among the four Classes of shares pro rata based on
the net assets of the Fund attributable to each Class, except as described
below. Such expenses include, but are not limited to: expenses of the Plan of
Distribution pursuant to Rule 12b-1; charges and expenses of any registrar,
custodian, stock transfer and dividend disbursing agent; brokerage commissions;
taxes; engraving and printing share certificates; registration costs of the Fund
and its shares under federal and state securities laws; the cost and expense of
printing, including typesetting, and distributing prospectuses of the Fund and
supplements thereto to the Fund's shareholders; all expenses of shareholders'
and Trustees' meetings and of preparing, printing and mailing of proxy
statements and reports to shareholders; fees and travel expenses of Trustees or
members of any advisory board or committee who are not employees of the
Investment Manager or any corporate affiliate of the Investment Manager; all
expenses incident to any dividend, withdrawal or redemption options; charges and
expenses of any outside service used for pricing of the Fund's shares; fees and
expenses of legal counsel, including counsel to the Trustees who are not
interested persons of the Fund or of the Investment Manager (not including
compensation or expenses of attorneys who are employees of the Investment
Manager); fees and expenses of the Fund's independent accountants; membership
dues of industry associations; interest on Fund borrowings; postage; insurance
premiums on property or personnel (including officers and Trustees) of the Fund
which inure to its benefit; extraordinary expenses (including, but not limited
to, legal claims and liabilities and litigation costs and any indemnification
relating thereto); and all other costs of the Fund's operation. The 12b-1 fees
relating to a particular Class will be allocated directly to that Class. In
addition, other expenses associated with a particular Class (except advisory or
custodial fees) may be allocated directly to that Class, provided that such
expenses are reasonably identified as specifically attributable to that Class
and the direct allocation to that Class is approved by the Trustees.
 
    The Management Agreement provides that in the absence of willful
misfeasance, bad faith, gross negligence or reckless disregard of its
obligations thereunder, the Investment Manager is not liable to the Fund or any
of its investors for any act or omission by the Investment Manager or for any
losses sustained by the Fund or its investors.
 
   
    The Management Agreement will remain in effect from year to year, provided
continuance of the Management Agreement is approved at least annually by the
vote of the holders of a majority, as defined in the Investment Company Act, of
the outstanding shares of the Fund, or by the Trustees; provided that in either
event such continuance is approved annually by the vote of a majority of the
Trustees.
    
 
                                       21
<PAGE>
D. DEALER REALLOWANCES
 
    Upon notice to selected broker-dealers, the Distributor may reallow up to
the full applicable front-end sales charge during periods specified in such
notice. During periods when 90% or more of the sales charge is reallowed, such
selected broker-dealers may be deemed to be underwriters as that term is defined
in the Securities Act.
 
E. RULE 12B-1 PLAN
 
    The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Investment Company Act (the "Plan") pursuant to which each Class, other than
Class D, pays the Distributor compensation accrued daily and payable monthly at
the following annual rates: 0.25% and 0.85% of the average daily net assets of
Class A and Class C, respectively, and, with respect to Class B, 0.85% of the
lesser of: (a) the average daily aggregate gross sales of the Fund's Class B
shares since the inception of the Fund (not including reinvestment of dividends
or capital gains distributions), less the average daily aggregate net asset
value of the Fund's Class B shares redeemed since the Fund's inception upon
which a contingent deferred sales charge has been imposed or upon which such
charge has been waived, or (b) the average daily net assets of Class B.
 
   
    The Distributor also receives the proceeds of front-end sales charges
("FSCs") and of contingent deferred sales charges ("CDSCs") imposed on certain
redemptions of shares, which are separate and apart from payments made pursuant
to the Plan. The Distributor has informed the Fund that it and/or Dean Witter
Reynolds received the proceeds of CDSCs and FSCs, for the last three fiscal
years ended October 31, in approximate amounts as provided in the table below
(the Distributor did not retain any of these amounts).
    
 
   
<TABLE>
<CAPTION>
                                                1998                       1997                       1996
                                       -----------------------    -----------------------    -----------------------
<S>                                    <C>            <C>         <C>            <C>         <C>            <C>
Class A............................    FSCs:(1)       $ 26,000    FSCs:          $ 22,000    FSCs:            N/A(2)
                                       CDSCs:         $ 13,000    CDSCs:         $      0    CDSCs:           N/A(2)
Class B............................    CDSCs:         $473,000    CDSCs:         $601,000    CDSCs:         $641,000
Class C............................    CDSCs:         $  2,000    CDSCs:         $      0    CDSCs:           N/A(2)
</TABLE>
    
 
- ------------------------
 
   
(1)  FSCs apply to Class A only.
    
 
   
(2)  This Class commenced operations on July 26, 1987.
    
 
    The Distributor has informed the Fund that the entire fee payable by Class A
and a portion of the fees payable by each of Class B and Class C each year
pursuant to the Plan equal to 0.20% of the average daily net assets of Class B
and 0.25% of the average daily net assets of Class C are currently each
characterized as a "service fee" under the Rules of the National Association of
Securities Dealers, Inc. (of which the Distributor is a member). The "service
fee" is a payment made for personal service and/or the maintenance of
shareholder accounts. The remaining portion of the Plan fees payable by a Class,
if any, is characterized as an "asset-based sales charge" as such is defined by
the Rules of the Association.
 
    Under the Plan and as required by Rule 12b-1, the Trustees receive and
review promptly after the end of each calendar quarter a written report provided
by the Distributor of the amounts expended under the Plan and the purpose for
which such expenditures were made. Class B shares of the Fund accrued amounts
payable to the Distributor under the Plan, during the fiscal year ended October
31, 1998, of $5,200,730. This amount is equal to 0.85% of the average daily net
assets of Class B for the fiscal year and was calculated pursuant to clause (b)
of the compensation formula under the Plan. For the fiscal year ended October
31, 1998, Class A and Class C shares of the Fund accrued payments under the Plan
amounting to $6,915 and $27,553, respectively, which amounts are equal to 0.25%
and 0.85% of the average daily net assets of Class A and Class C, respectively,
for the fiscal year.
 
    The Plan was adopted in order to permit the implementation of the Fund's
method of distribution. Under this distribution method the Fund offers four
Classes, each with a different distribution arrangement.
 
                                       22
<PAGE>
    With respect to Class A shares, Dean Witter Reynolds compensates its
Financial Advisors by paying them, from proceeds of the FSC, commissions for the
sale of Class A shares, currently a gross sales credit of up to 4.0% of the
amount sold (except as provided in the following sentence) and an annual
residual commission, currently a residual of up to 0.20% of the current value of
the respective accounts for which they are the Financial Advisors or dealers of
record in all cases. On orders of $1 million or more (for which no sales charge
was paid) or net asset value purchases by employer-sponsored employee benefit
plans, whether or not qualified under the Internal Revenue Code, for which the
Transfer Agent serves as Trustee or Dean Witter Reynolds Retirement Plan
Services serves as recordkeeper pursuant to a written Recordkeeping Services
Agreement ("MSDW Eligible Plans"), the Investment Manager compensates Financial
Advisors by paying them, from its own funds, a gross sales credit of 1.0% of the
amount sold.
 
    With respect to Class B shares, Dean Witter Reynolds compensates its
Financial Advisors by paying them, from its own funds, commissions for the sale
of Class B shares, currently a gross sales credit of up to 4.0% of the amount
sold (except as provided in the following sentence) and an annual residual
commission, currently a residual of up to 0.20% of the current value (not
including reinvested dividends or distributions) of the amount sold in all
cases. In the case of Class B shares purchased by MSDW Eligible Plans, Dean
Witter Reynolds compensates its Financial Advisors by paying them, from its own
funds, a gross sales credit of 3.0% of the amount sold.
 
    With respect to Class C shares, Dean Witter Reynolds compensates its
Financial Advisors by paying them, from its own funds, commissions for the sale
of Class C shares, currently a gross sales credit of up to 1.0% of the amount
sold and an annual residual commission, currently up to 0.85% of the current
value of the respective accounts for which they are the Financial Advisors of
record.
 
    With respect to Class D shares other than shares held by participants in the
Investment Manager's mutual fund asset allocation program, the Investment
Manager compensates Dean Witter Reynolds's Financial Advisors by paying them,
from its own funds, commissions for the sale of Class D shares, currently a
gross sales credit of up to 1.0% of the amount sold. There is a chargeback of
100% of the amount paid if the Class D shares are redeemed in the first year and
a chargeback of 50% of the amount paid if the Class D shares are redeemed in the
second year after purchase. The Investment Manager also compensates Dean Witter
Reynolds's Financial Advisors by paying them, from its own funds, an annual
residual commission, currently up to 0.10% of the current value of the
respective accounts for which they are the Financial Advisors of record (not
including accounts of participants in the Investment Manager's mutual fund asset
allocation program).
 
    The gross sales credit is a charge which reflects commissions paid by Dean
Witter Reynolds to its Financial Advisors and Dean Witter Reynolds's
Fund-associated distribution-related expenses, including sales compensation, and
overhead and other branch office distribution-related expenses including (a) the
expenses of operating Dean Witter Reynolds's branch offices in connection with
the sale of Fund shares, including lease costs, the salaries and employee
benefits of operations and sales support personnel, utility costs,
communications costs and the costs of stationery and supplies, (b) the costs of
client sales seminars, (c) travel expenses of mutual fund sales coordinators to
promote the sale of Fund shares and (d) other expenses relating to branch
promotion of Fund sales.
 
    The distribution fee that the Distributor receives from the Fund under the
Plan, in effect, offsets distribution expenses incurred under the Plan on behalf
of the Fund and, in the case of Class B shares, opportunity costs, such as the
gross sales credit and an assumed interest charge thereon ("carrying charge").
In the Distributor's reporting of the distribution expenses to the Fund, in the
case of Class B shares, such assumed interest (computed at the "broker's call
rate") has been calculated on the gross credit as it is reduced by amounts
received by the Distributor under the Plan and any contingent deferred sales
charges received by the Distributor upon redemption of shares of the Fund. No
other interest charge is included as a distribution expense in the Distributor's
calculation of its distribution costs for this purpose. The broker's call rate
is the interest rate charged to securities brokers on loans secured by
exchange-listed securities.
 
                                       23
<PAGE>
    The Fund is authorized to reimburse expenses incurred or to be incurred in
promoting the distribution of the Fund's Class A and Class C shares and in
servicing shareholder accounts. Reimbursement will be made through payments at
the end of each month. The amount of each monthly payment may in no event exceed
an amount equal to a payment at the annual rate of 0.25%, in the case of Class
A, and 0.85%, in the case of Class C, of the average net assets of the
respective Class during the month. No interest or other financing charges, if
any, incurred on any distribution expenses on behalf of Class A and Class C will
be reimbursable under the Plan. With respect to Class A, in the case of all
expenses other than expenses representing the service fee, and, with respect to
Class C, in the case of all expenses other than expenses representing a gross
sales credit or a residual to Financial Advisors and other authorized financial
representatives, such amounts shall be determined at the beginning of each
calendar quarter by the Trustees, including, a majority of the Independent
Trustees. Expenses representing the service fee (for Class A) or a gross sales
credit or a residual to Financial Advisors and other authorized financial
representatives (for Class C) may be reimbursed without prior determination. In
the event that the Distributor proposes that monies shall be reimbursed for
other than such expenses, then in making quarterly determinations of the amounts
that may be reimbursed by the Fund, the Distributor will provide and the
Trustees will review a quarterly budget of projected distribution expenses to be
incurred on behalf of the Fund, together with a report explaining the purposes
and anticipated benefits of incurring such expenses. The Trustees will determine
which particular expenses, and the portions thereof, that may be borne by the
Fund, and in making such a determination shall consider the scope of the
Distributor's commitment to promoting the distribution of the Fund's Class A and
Class C shares.
 
    Each Class paid 100% of the amounts accrued under the Plan with respect to
that Class for the fiscal year ended October 31, 1998 to the Distributor. The
Distributor and Dean Witter Reynolds estimate that they have spent, pursuant to
the Plan, $183,824,041 on behalf of Class B since the inception of the Plan. It
is estimated that this amount was spent in approximately the following ways: (i)
2.76% ($5,076,079)-- advertising and promotional expenses; (ii) 0.24%
($440,961)--printing of prospectuses for distribution to other than current
shareholders; and (iii) 97.00% ($178,307,001)--other expenses, including the
gross sales credit and the carrying charge, of which 17.65% ($31,462,490)
represents carrying charges, 33.68% ($60,059,405) represents commission credits
to Dean Witter Reynolds branch offices and other selected broker-dealers for
payments of commissions to Financial Advisors and other authorized financial
representatives, and 48.67% ($86,785,106) represents overhead and other branch
office distribution-related expenses. The amounts accrued by Class A and Class C
for distribution during the fiscal year ended October 31, 1998 were for expenses
which relate to compensation of sales personnel and associated overhead
expenses.
 
    In the case of Class B shares, at any given time, the expenses of
distributing shares of the Fund may be more or less than the total of (i) the
payments made by the Fund pursuant to the Plan; and (ii) the proceeds of CDSCs
paid by investors upon redemption of shares. For example, if $1 million in
expenses in distributing Class B shares of the Fund had been incurred and
$750,000 had been received as described in (i) and (ii) above, the excess
expense would amount to $250,000. The Distributor has advised the Fund that in
the case of Class B shares the excess distribution expenses, including the
carrying charge designed to approximate the opportunity costs incurred by Dean
Witter Reynolds which arise from it having advanced monies without having
received the amount of any sales charges imposed at the time of sale of the
Fund's Class B shares, totaled $22,724,037 as of October 31, 1998 (the end of
the Fund's fiscal year), which was equal to 3.56% of the net assets of Class B
on such date. Because there is no requirement under the Plan that the
Distributor be reimbursed for all distribution expenses with respect to Class B
shares or any requirement that the Plan be continued from year to year, this
excess amount does not constitute a liability of the Fund. Although there is no
legal obligation for the Fund to pay expenses incurred in excess of payments
made to the Distributor under the Plan and the proceeds of CDSCs paid by
investors upon redemption of shares, if for any reason the Plan is terminated,
the Trustees will consider at that time the manner in which to treat such
expenses. Any cumulative expenses incurred, but not yet recovered through
distribution fees or CDSCs, may or may not be recovered through future
distribution fees or CDSCs.
 
                                       24
<PAGE>
   
    In the case of Class A and Class C shares, expenses incurred pursuant to the
Plan in any calendar year in excess of 0.25% or 1.0% of the average daily net
assets of Class A or Class C, respectively, will not be reimbursed by the Fund
through payments in any subsequent year, except that expenses representing a
gross sales commission credited to Morgan Stanley Dean Witter Financial Advisors
and other authorized financial representatives at the time of sale may be
reimbursed in the subsequent calendar year. The Distributor has advised the Fund
that unreimbursed expenses representing a gross sales commission credited to
Morgan Stanley Dean Witter Financial Advisors and other authorized financial
representatives at the time of sale totaled $21,587 in the case of Class C at
December 31, 1998 (the end of the calendar year), which amount was equal to
0.28% of the net assets of Class C on such date, and that there were no such
expenses that may be reimbursed in the subsequent year in the case of Class A on
such date. No interest or other financing charges will be incurred on any Class
A or Class C distribution expenses incurred by the Distributor under the Plan or
on any unreimbursed expenses due to the Distributor pursuant to the Plan.
    
 
    No interested person of the Fund nor any Independent Trustee has any direct
financial interest in the operation of the Plan except to the extent that the
Distributor, the Investment Manager, Dean Witter Reynolds, MSDW Services Company
or certain of their employees may be deemed to have such an interest as a result
of benefits derived from the successful operation of the Plan or as a result of
receiving a portion of the amounts expended thereunder by the Fund.
 
   
    On an annual basis the Trustees, including a majority of the Independent
Trustees, consider whether the Plan should be continued. Prior to approving the
last continuation of the Plan, the Trustees requested and received from the
Distributor and reviewed all the information which they deemed necessary to
arrive at an informed determination. In making their determination to continue
the Plan, the Trustees considered: (1) the Fund's experience under the Plan and
whether such experience indicates that the Plan is operating as anticipated; (2)
the benefits the Fund had obtained, was obtaining and would be likely to obtain
under the Plan, including that: (a) the Plan is essential in order to give Fund
investors a choice of alternatives for payment of distribution and service
charges and to enable the Fund to continue to grow and avoid a pattern of net
redemptions which, in turn, are essential for effective investment management;
and (b) without the compensation to individual brokers and the reimbursement of
distribution and account maintenance expenses of Dean Witter Reynolds's branch
offices made possible by the 12b-1 fees, Dean Witter Reynolds could not
establish and maintain an effective system for distribution, servicing of Fund
shareholders and maintenance of shareholder accounts; and (3) what services had
been provided and were continuing to be provided under the Plan to the Fund and
its shareholders. Based upon their review, the Trustees, including each of the
Independent Trustees, determined that continuation of the Plan would be in the
best interest of the Fund and would have a reasonable likelihood of continuing
to benefit the Fund and its shareholders. In the Trustees' quarterly review of
the Plan, they will consider its continued appropriateness and the level of
compensation provided therein.
    
 
    The Plan may not be amended to increase materially the amount to be spent
for the services described therein without approval by the shareholders of the
affected Class or Classes of the Fund, and all material amendments to the Plan
must also be approved by the Trustees in the manner described above. The Plan
may be terminated at any time, without payment of any penalty, by vote of a
majority of the Independent Trustees or by a vote of a majority of the
outstanding voting securities of the Fund (as defined in the Investment Company
Act) on not more than thirty days' written notice to any other party to the
Plan. So long as the Plan is in effect, the election and nomination of
Independent Trustees shall be committed to the discretion of the Independent
Trustees.
 
                                       25
<PAGE>
F. OTHER SERVICE PROVIDERS
 
(1) TRANSFER AGENT/DIVIDEND-PAYING AGENT
 
   
    Morgan Stanley Dean Witter Trust FSB is the Transfer Agent for the Fund's
shares and the Dividend Disbursing Agent for payment of dividends and
distributions on Fund shares and Agent for shareholders under various investment
plans. The principal business address of the Transfer Agent is Harborside
Financial Center, Plaza Two, Jersey City, New Jersey 07311.
    
 
(2) CUSTODIAN AND INDEPENDENT ACCOUNTANTS
 
    The Bank of New York, 90 Washington Street, New York, New York 10286 is the
Custodian of the Fund's assets. Any of the Fund's cash balances with either
Custodian in excess of $100,000 are unprotected by federal deposit insurance.
These balances may, at times, be substantial.
 
   
    PricewaterhouseCoopers LLP, 1177 Avenue of the Americas, New York, New York
10036 serves as the independent accountants of the Fund. The independent
accountants are responsible for auditing the annual financial statements of the
Fund.
    
 
(3) AFFILIATED PERSONS
 
    The Transfer Agent is an affiliate of the Investment Manager, and of the
Distributor. As Transfer Agent and Dividend Disbursing Agent, the Transfer
Agent's responsibilities include maintaining shareholder accounts, disbursing
cash dividends and reinvesting dividends, processing account registration
changes, handling purchase and redemption transactions, mailing prospectuses and
reports, mailing and tabulating proxies, processing share certificate
transactions, and maintaining shareholder records and lists. For these services,
the Transfer Agent receives a per shareholder account fee from the Fund.
 
VI. BROKERAGE ALLOCATION AND OTHER PRACTICES
- --------------------------------------------------------------------------------
 
A. BROKERAGE TRANSACTIONS
 
    Subject to the general supervision of the Trustees of the Fund, the
Investment Manager is responsible for the investment decisions and the placing
of the orders for portfolio transactions for the Fund. The Fund's portfolio
transactions will occur primarily with issuers, underwriters or major dealers in
U.S. Government securities acting as principals. Such transactions are normally
on a net basis and do not involve payment of brokerage commissions. The cost of
securities purchased from an underwriter usually includes a commission paid by
the issuer to the underwriters; transactions with dealers normally reflect the
spread between bid and asked prices. Options and futures transactions will
usually be effected through a broker and a commission will be charged.
 
    For the fiscal years ended October 31, 1996, 1997 and 1998, the Fund paid a
total of $109,449, $80,486 and $81,461, respectively, in brokerage commissions.
 
B. COMMISSIONS
 
    Pursuant to an order of the SEC, the Fund may effect principal transactions
in certain money market instruments with Dean Witter Reynolds. The Fund will
limit its transactions with Dean Witter Reynolds to U.S. Government and
government agency securities, bank money instruments (i.e., certificates of
deposit and bankers' acceptances) and commercial paper. The transactions will be
effected with Dean Witter Reynolds only when the price available from Dean
Witter Reynolds is better than that available from other dealers.
 
    During the fiscal years ended October 31, 1996, 1997 and 1998, the Fund did
not effect any principal transactions with Dean Witter Reynolds.
 
    Consistent with the policy described above, brokerage transactions in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected through Dean Witter Reynolds, Morgan Stanley & Co. and other affiliated
brokers and dealers. In order for an affiliated broker or dealer to effect any
portfolio transactions on an exchange for the Fund, the commissions, fees or
other remuneration received by the affiliated broker or dealer must be
reasonable and fair compared to the
 
                                       26
<PAGE>
commissions, fees or other remuneration paid to other brokers in connection with
comparable transactions involving similar securities being purchased or sold on
an exchange during a comparable period of time. This standard would allow the
affiliated broker or dealer to receive no more than the remuneration which would
be expected to be received by an unaffiliated broker in a commensurate
arm's-length transaction. Furthermore, the Trustees, including the Independent
Trustees, have adopted procedures which are reasonably designed to provide that
any commissions, fees or other remuneration paid to an affiliated broker or
dealer are consistent with the foregoing standard. The Fund does not reduce the
management fee it pays to the Investment Manager by any amount of the brokerage
commissions it may pay to an affiliated broker or dealer.
 
    During the fiscal years ended October 31, 1996, 1997 and 1998, the Fund paid
a total of $8,477, $9,506 and $450, respectively, in brokerage commissions to
Dean Witter Reynolds. During the fiscal year ended October 31, 1998, the
brokerage commissions paid to Dean Witter Reynolds represented approximately
0.55% of the total brokerage commissions paid by the Fund during the year and
were paid on account of transactions having an aggregate dollar value equal to
approximately 0.38% of the aggregate dollar value of all portfolio transactions
of the Fund during the year for which commissions were paid. In addition, during
the fiscal years ended October 31, 1996, 1997 and 1998, the Fund paid Dean
Witter Reynolds $69,669, $56,029 and $4,339, respectively, for clearing options
and futures transactions.
 
C. BROKERAGE SELECTION
 
    The policy of the Fund regarding purchases and sales of securities for its
portfolio is that primary consideration will be given to obtaining the most
favorable prices and efficient executions of transactions.
 
    In seeking to implement the Fund's policies, the Investment Manager effects
transactions with those brokers and dealers who the Investment Manager believes
provide the most favorable prices and are capable of providing efficient
executions. If the Investment Manager believes the prices and executions are
obtainable from more than one broker or dealer, it may give consideration to
placing portfolio transactions with those brokers and dealers who also furnish
research and other services to the Fund or the Investment Manager. The services
may include, but are not limited to, any one or more of the following:
information as to the availability of securities for purchase or sale;
statistical or factual information or opinions pertaining to investment; wire
services; and appraisals or evaluations of portfolio securities. The information
and services received by the Investment Manager from brokers and dealers may be
of benefit to the Investment Manager in the management of accounts of some of
its other clients and may not in all cases benefit the Fund directly.
 
    The Investment Manager currently serves as investment manager to a number of
clients, including other investment companies, and may in the future act as
investment manager or advisor to others. It is the practice of the Investment
Manager to cause purchase and sale transactions to be allocated among the Fund
and others whose assets it manages in such manner as it deems equitable. In
making such allocations among the Fund and other client accounts, various
factors may be considered, including the respective investment objectives, the
relative size of portfolio holdings of the same or comparable securities, the
availability of cash for investment, the size of investment commitments
generally held and the opinions of the persons responsible for managing the
portfolios of the Fund and other client accounts. In the case of certain initial
and secondary public offerings, the Investment Manager utilizes a pro rata
allocation process based on the size of the Morgan Stanley Dean Witter Funds
involved and the number of shares available from the public offering.
 
D. DIRECTED BROKERAGE
 
    During the fiscal year ended October 31, 1998, the Fund did not pay any
brokerage commissions to brokers because of research services provided.
 
                                       27
<PAGE>
E. REGULAR BROKER-DEALERS
 
    During the fiscal year ended October 31, 1998, the Fund did not purchase
securities issued by brokers or dealers that were among the ten brokers or the
ten dealers which executed transactions for or with the Fund in the largest
dollar amounts during the year. At October 31, 1998, the Fund did not own any
securities issued by any of such issuers.
 
VII. CAPITAL STOCK AND OTHER SECURITIES
- --------------------------------------------------------------------------------
 
    The shareholders of the Fund are entitled to a full vote for each full share
of beneficial interest held. The Fund is authorized to issue an unlimited number
of shares of beneficial interest. All shares of beneficial interest of the Fund
are of $0.01 par value and are equal as to earnings, assets and voting
privileges except that each Class will have exclusive voting privileges with
respect to matters relating to distribution expenses borne solely by such Class
or any other matter in which the interests of one Class differ from the
interests of any other Class. In addition, Class B shareholders will have the
right to vote on any proposed material increase in Class A's expenses, if such
proposal is submitted separately to Class A shareholders. Also, Class A, Class B
and Class C bear expenses related to the distribution of their respective
shares.
 
    The Fund's Declaration of Trust permits the Trustees to authorize the
creation of additional series of shares (the proceeds of which would be invested
in separate, independently managed portfolios) and additional Classes of shares
within any series. The Trustees have not presently authorized any such
additional series or Classes of shares other than as set forth in the
PROSPECTUS.
 
    The Fund is not required to hold annual meetings of shareholders and in
ordinary circumstances the Fund does not intend to hold such meetings. The
Trustees may call special meetings of shareholders for action by shareholder
vote as may be required by the Investment Company Act or the Declaration of
Trust. Under certain circumstances, the Trustees may be removed by action of the
Trustees or by the shareholders.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
limited circumstances, be held personally liable as partners for the obligations
of the Fund. However, the Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Fund, requires that notice
of such Fund obligations include such disclaimer, and provides for
indemnification out of the Fund's property for any shareholder held personally
liable for the obligations of the Fund. Thus, the risk of a shareholder
incurring financial loss on account of shareholder liability is limited to
circumstances in which the Fund itself would be unable to meet its obligations.
Given the above limitations on shareholder personal liability, and the nature of
the Fund's assets and operations, the possibility of the Fund being unable to
meet its obligations is remote and thus, in the opinion of Massachusetts counsel
to the Fund, the risk to Fund shareholders of personal liability is remote.
 
    All of the Trustees have been elected by the shareholders of the Fund, most
recently at a Special Meeting of Shareholders held on May 21, 1997. The Trustees
themselves have the power to alter the number and the terms of office of the
Trustees (as provided for in the Declaration of Trust), and they may at any time
lengthen or shorten their own terms or make their terms of unlimited duration
and appoint their own successors, provided that always at least a majority of
the Trustees has been elected by the shareholders of the Fund.
 
VIII. PURCHASE, REDEMPTION AND PRICING OF SHARES
- --------------------------------------------------------------------------------
 
   
A. PURCHASE/REDEMPTION OF SHARES
    
 
    Information concerning how Fund shares are offered to the public (and how
they are redeemed and exchanged) is provided in the Fund's PROSPECTUS.
 
    TRANSFER AGENT AS AGENT.  With respect to the redemption or repurchase of
Fund shares, the application of proceeds to the purchase of new shares in the
Fund or any other Morgan Stanley Dean
 
                                       28
<PAGE>
Witter Funds and the general administration of the exchange privilege, the
Transfer Agent acts as agent for the Distributor and for the shareholder's
authorized broker-dealer, if any, in the performance of such functions. With
respect to exchanges, redemptions or repurchases, the Transfer Agent shall be
liable for its own negligence and not for the default or negligence of its
correspondents or for losses in transit. The Fund shall not be liable for any
default or negligence of the Transfer Agent, the Distributor or any authorized
broker-dealer.
 
    The Distributor and any authorized broker-dealer have appointed the Transfer
Agent to act as their agent in connection with the application of proceeds of
any redemption of Fund shares to the purchase of shares of any other Morgan
Stanley Dean Witter Fund and the general administration of the exchange
privilege. No commission or discounts will be paid to the Distributor or any
authorized broker-dealer for any transaction pursuant to the exchange privilege.
 
    TRANSFERS OF SHARES.  In the event a shareholder requests a transfer of Fund
shares to a new registration, the shares will be transferred without sales
charge at the time of transfer. With regard to the status of shares which are
either subject to the CDSC or free of such charge (and with regard to the length
of time shares subject to the charge have been held), any transfer involving
less than all of the shares in an account will be made on a pro rata basis (that
is, by transferring shares in the same proportion that the transferred shares
bear to the total shares in the account immediately prior to the transfer). The
transferred shares will continue to be subject to any applicable CDSC as if they
had not been so transferred.
 
B. OFFERING PRICE
 
   
    The Fund's Class B, Class C and Class D shares are offered at net asset
value per share and the Class A shares are offered at net asset value per share
plus any applicable FSC which is distributed among the Fund's Distributor, Dean
Witter Reynolds and other authorized dealers as described in Section "V.
Investment Management and Other Services--E. Rule 12b-1 Plan." The price of Fund
shares, called "net asset value," is based on the value of the Fund's portfolio
securities. Net asset value per share of each Class is calculated by dividing
the value of the portion of the Fund's securities and other assets attributable
to that Class, less the liabilities attributable to that Class, by the number of
shares of that Class outstanding. The assets of each Class of shares are
invested in a single portfolio. The net asset value of each Class, however, will
differ because the Classes have different ongoing fees.
    
 
    In the calculation of the Fund's net asset value: (1) all portfolio
securities for which over-the-counter market quotations are readily available
are valued at the latest bid price prior to the time of valuation, and (2) when
market quotations are not readily available, including circumstances under which
it is determined by the Investment Manager that sale or bid prices are not
reflective of a security's market value, portfolio securities are valued at
their fair value as determined in good faith under procedures established by and
under the general supervision of the Fund's Trustees (valuation of securities
for which market quotations are not readily available may also be based upon
current market prices of securities which are comparable in coupon, rating and
maturity or an appropriate matrix utilizing similar factors).
 
    Short-term debt securities with remaining maturities of sixty days or less
at the time of purchase are valued at amortized cost, unless the Trustees
determine such does not reflect the securities' market value, in which case
these securities will be valued at their fair value as determined by the
Trustees.
 
    Certain of the Fund's portfolio securities may be valued by an outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a matrix system incorporating security quality, maturity and coupon as the
evaluation model parameters, and/or research evaluations by its staff, including
review of broker-dealer market price quotations in determining what it believes
is the fair valuation of the portfolio securities valued by such pricing
service.
 
    Listed options on debt securities are valued at the latest sale price on the
exchange on which they are listed unless no sales of such options have taken
place that day, in which case they will be valued at the mean between their
latest bid and asked prices. Unlisted options on debt securities are valued at
the mean between their latest bid and asked prices. Futures are valued at the
latest sale price on the
 
                                       29
<PAGE>
commodities exchange on which they trade unless the Trustees determine such
price does not reflect their market value, in which case they will be valued at
their fair value as determined in good faith under procedures established by and
under the supervision of the Trustees.
 
IX. TAXATION OF THE FUND AND SHAREHOLDERS
- --------------------------------------------------------------------------------
 
    The Fund generally will make two basic types of distributions: ordinary
dividends and long-term capital gain distributions. These two types of
distributions are reported differently on a shareholder's income tax return and
they are also subject to different rates of tax. The tax treatment of the
investment activities of the Fund will affect the amount and timing and
character of the distributions made by the Fund. Tax issues relating to the Fund
are not generally a consideration for shareholders such as tax exempt entities
and tax-advantaged retirement vehicles such as an IRA or 401(k) plan.
Shareholders are urged to consult their own tax professionals regarding specific
questions as to federal, state or local taxes.
 
    INVESTMENT COMPANY TAXATION.  The Fund intends to remain qualified as a
regulated investment company under Subchapter M of the Internal Revenue Code of
1986. As such, the Fund will not be subject to federal income tax on its net
investment income and capital gains, if any, to the extent that it distributes
such income and capital gains to its shareholders.
 
    The Fund generally intends to distribute sufficient income and gains so that
the Fund will not pay corporate income tax on its earnings. The Fund also
generally intends to distribute to its shareholders in each calendar year a
sufficient amount of ordinary income and capital gains to avoid the imposition
of a 4% excise tax. However, the Fund may instead determine to retain all or
part of any net long-term capital gains in any year for reinvestment. In such
event, the Fund will pay federal income tax (and possibly excise tax) on such
retained gains.
 
    Gains or losses on sales of securities by the Fund will be long-term capital
gains or losses if the securities have a tax holding period of more than one
year. Gains or losses on the sale of securities with a tax holding period of one
year or less will be short-term gains or losses.
 
    Gains or losses on the Fund's transactions in listed non-equity options,
futures and options on futures generally are treated as 60% long-term and 40%
short-term. When the Fund engages in options and futures transactions, various
tax rules may accelerate or defer recognition of certain gains and losses,
change the character of certain gains or losses, or alter the holding period of
other investments held by the Fund. The application of these rules would
therefore also affect the amount, timing and character of distributions made by
the Fund.
 
    Under certain tax rules, the Fund may be required to accrue a portion of any
discount at which certain securities are purchased as income each year even
though the Fund receives no payments in cash on the security during the year. To
the extent that the Fund invests in such securities, it would be required to pay
out such accrued discount as an income distribution in each year in order to
avoid taxation at the Fund level. Such distributions will be made from the
available cash of the Fund or by liquidation of portfolio securities if
necessary. If a distribution of cash necessitates the liquidation of portfolio
securities, the Investment Manager will select which securities to sell. The
Fund may realize a gain or loss from such sales. In the event the Fund realizes
net capital gains from such transactions, its shareholders may receive a larger
capital gain distribution, if any, than they would in the absence of such
transactions.
 
    TAXATION OF DIVIDENDS AND DISTRIBUTIONS.  Shareholders normally will have to
pay federal income taxes, and any state and/or local income taxes, on the
dividends and other distributions they receive from the Fund. Such dividends and
distributions, to the extent that they are derived from net investment income or
short-term capital gains, are taxable to the shareholder as ordinary income
regardless of whether the shareholder receives such payments in additional
shares or in cash.
 
                                       30
<PAGE>
    Distributions of net long-term capital gains, if any, are taxable to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional shares or in cash. The Taxpayer Relief Act of 1997 reduced the
maximum tax on long-term capital gains applicable to individuals from 28% to
20%.
 
    Shareholders are generally taxed on any ordinary dividend or capital gain
distributions from the Fund in the year they are actually distributed. However,
if any such dividends or distributions are declared in October, November or
December and paid in January then such amounts will be treated for tax purposes
as received by the shareholders on December 31, to shareholders of record of
such month.
 
    Shareholders who are not citizens or residents of the United States and
certain foreign entities may be subject to withholding of United States tax on
distributions made by the Fund of investment income and short term capital
gains.
 
   
    After the end of each calendar year, shareholders will be sent full
information on their dividends and capital gain distributions for tax purposes,
including the portion taxable as ordinary income and the portion taxable as
long-term capital gains.
    
 
    PURCHASES AND REDEMPTIONS AND EXCHANGES OF FUND SHARES.  Any dividend or
capital gains distribution received by a shareholder from any investment company
will have the effect of reducing the net asset value of the shareholder's stock
in that company by the exact amount of the dividend or capital gains
distribution. Furthermore, such dividends and capital gains distributions are
subject to federal income taxes. If the net asset value of the shares should be
reduced below a shareholder's cost as a result of the payment of dividends or
the distribution of realized long-term capital gains, such payment or
distribution would be in part a return of the shareholder's investment but
nonetheless would be taxable to the shareholder. Therefore, an investor should
consider the tax implications of purchasing Fund shares immediately prior to a
distribution record date.
 
    In general, a sale of shares results in capital gain or loss, and for
individual shareholders, is taxable at a federal rate dependent upon the length
of time the shares were held. A redemption of a shareholder's Fund shares is
normally treated as a sale for tax purposes. Fund shares held for a period of
one year or less will, for tax purposes, generally result in short-term gains or
losses and those held for more than one year generally result in long-term gain
or loss. Any loss realized by shareholders upon a redemption of shares within
six months of the date of their purchase will be treated as a long-term capital
loss to the extent of any distributions of net long-term capital gains with
respect to such shares during the six-month period.
 
    Gain or loss on the sale or redemption of shares in the Fund is measured by
the difference between the amount received and the tax basis of the shares.
Shareholders should keep records of investments made (including shares acquired
through reinvestment of dividends and distributions) so they can compute the tax
basis of their shares. Under certain circumstances a shareholder may compute and
use an average cost basis in determining the gain or loss on the sale or
redemption of shares.
 
    Exchanges of Fund shares for shares of another fund, including shares of
other Morgan Stanley Dean Witter Funds, are also subject to similar tax
treatment. Such an exchange is treated for tax purposes as a sale of the
original shares in the first fund, followed by the purchase of shares in the
second fund.
 
    If a shareholder realizes a loss on the redemption or exchange of a fund's
shares and reinvests in that fund's shares within 30 days before or after the
redemption or exchange, the transactions may be subject to the "wash sale"
rules, resulting in a postponement of the recognition of such loss for tax
purposes.
 
                                       31
<PAGE>
X. UNDERWRITERS
- --------------------------------------------------------------------------------
 
    The Fund's shares are offered to the public on a continuous basis. The
Distributor, as the principal underwriter of the shares, has certain obligations
under the Distribution Agreement concerning the distribution of the shares.
These obligations and the compensation the Distributor receives are described
above in the sections titled "Principal Underwriter" and "Rule 12b-1 Plans."
 
XI. CALCULATION OF PERFORMANCE DATA
- --------------------------------------------------------------------------------
 
    From time to time the Fund may quote its "yield" and/or its "total return"
in advertisements and sales literature. These figures are computed separately
for Class A, Class B, Class C and Class D shares. Yield is calculated for any
30-day period as follows: the amount of interest income for each security in the
Fund's portfolio is determined in accordance with regulatory requirements; the
total for the entire portfolio constitutes the Fund's gross income for the
period. Expenses accrued during the period are subtracted to arrive at "net
investment income" of each Class. The resulting amount is divided by the product
of the maximum offering price per share on the last day of the period,
multiplied by the average number of shares of the applicable Class outstanding
during the period that were entitled to dividends. This amount is added to 1 and
raised to the sixth power. 1 is then subtracted from the result and the
difference is multiplied by 2 to arrive at the annualized yield. For the 30-day
period ended October 31, 1998, the yield, calculated pursuant to the formula
described above, was approximately 5.30%, 4.94%, 4.93% and 5.80% for Class A,
Class B, Class C and Class D, respectively.
 
    The Fund's "average annual total return" represents an annualization of the
Fund's total return over a particular period and is computed by finding the
annual percentage rate which will result in the ending redeemable value of a
hypothetical $1,000 investment made at the beginning of a one, five or ten year
period, or for the period from the date of commencement of operations, if
shorter than any of the foregoing. The ending redeemable value is reduced by any
contingent deferred sales charge ("CDSC") at the end of the one, five, ten year
or other period. For the purpose of this calculation, it is assumed that all
dividends and distributions are reinvested. The formula for computing the
average annual total return involves a percentage obtained by dividing the
ending redeemable value by the amount of the initial investment (which in the
case of Class A shares is reduced by the Class A initial sales charge), taking a
root of the quotient (where the root is equivalent to the number of years in the
period) and subtracting 1 from the result. The average annual total returns for
Class B for the one, five and ten year periods ended October 31, 1998 were
5.35%, 5.61% and 8.08%, respectively. The average annual total returns of Class
A for the fiscal year ended October 31, 1998 and for the period July 28, 1997
(inception of the Class) through October 31, 1998 were 6.05% and 7.91%,
respectively. The average annual total returns of Class C for the fiscal year
ended October 31, 1998 and for the period July 28, 1997 (inception of the Class)
through October 31, 1998 were 9.30% and 11.12%, respectively. The average annual
total returns of Class D for the fiscal year ended October 31, 1998 and for the
period July 28, 1997 (inception of the Class) through October 31, 1998 were
11.30% and 11.13%, respectively.
 
    In addition, the Fund may advertise its total return for each Class over
different periods of time by means of aggregate, average, year-by-year or other
types of total return figures. These calculations may or may not reflect the
imposition of the maximum front-end sales charge for Class A or the deduction of
the CDSC for each of Class B and Class C which, if reflected, would reduce the
performance quoted. For example, the average annual total return of the Fund may
be calculated in the manner described above, but without deduction for any
applicable sales charge. Based on this calculation, the average annual total
returns of Class B for the one, five and ten year periods ended October 31,
1998, were 10.35%, 5.92% and 8.08%, respectively. Based on this calculation, the
average annual total returns of Class A for the fiscal year ended October 31,
1998 and for the period July 28, 1997 through October 31, 1998 were 10.75% and
11.69%, respectively, the average annual total returns of Class C for the fiscal
year ended October 31, 1998 and for the period July 28, 1997 through October 31,
1998 were 10.30% and 11.12%, respectively, and the average annual total returns
of Class D for the fiscal year ended October 31, 1998 and for the period July
28, 1997 through October 31, 1998 were 11.30% and 11.13%, respectively.
 
                                       32
<PAGE>
    In addition, the Fund may compute its aggregate total return for each Class
for specified periods by determining the aggregate percentage rate which will
result in the ending value of a hypothetical $1,000 investment made at the
beginning of the period. For the purpose of this calculation, it is assumed that
all dividends and distributions are reinvested. The formula for computing
aggregate total return involves a percentage obtained by dividing the ending
value (without reduction for any sales charge) by the initial $1,000 investment
and subtracting 1 from the result. Based on the foregoing calculation, the total
returns for Class B for the one, five and ten year period ended October 31,
1998, were 10.35%, 33.30% and 117.53%, respectively. Based on the foregoing
calculation, the total returns of Class A for the fiscal year ended October 31,
1998 and for the period July 28, 1997 through October 31, 1998 were 10.75% and
14.94%, respectively, the total returns of Class C for the fiscal year ended
October 31, 1998 and for the period July 28, 1997 through October 31, 1998 were
10.30% and 14.20%, respectively, and the total returns of Class D for the fiscal
year ended October 31, 1998 and for the period July 28, 1997 through October 31,
1998 were 11.30% and 14.21%, respectively.
 
   
    The Fund may also advertise the growth of hypothetical investments of
$10,000, $50,000 and $100,000 in each Class of shares of the Fund by adding 1 to
the Fund's aggregate total return to date (expressed as a decimal and without
taking into account the effect of any applicable CDSC) and multiplying by
$9,575, $48,250 and $97,250 in the case of Class A (investments of $10,000,
$50,000 and $100,000 adjusted for the initial sales charge) or by $10,000,
$50,000 and $100,000 in the case of each of Class B, Class C and Class D, as the
case may be. Investments of $10,000, $50,000 and $100,000 in each Class at
inception of the Class would have grown to the following amounts at October 31,
1998:
    
 
<TABLE>
<CAPTION>
                                                                                 INVESTMENT AT INCEPTION OF:
                                                                 INCEPTION   -----------------------------------
CLASS                                                              DATE:      $10,000     $50,000     $100,000
- ---------------------------------------------------------------  ----------  ---------  -----------  -----------
<S>                                                              <C>         <C>        <C>          <C>
Class A........................................................    07/28/97  $  11,006  $    55,459  $   111,779
Class B........................................................    03/31/87     23,408      117,040      234,080
Class C........................................................    07/28/97     11,420       57,100      114,200
Class D........................................................    07/28/97     11,421       57,105      114,210
</TABLE>
 
    The Fund from time to time may also advertise its performance relative to
certain performance rankings and indexes compiled by independent organizations.
 
XII. FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
 
   
    EXPERTS.  The financial statements of the Fund for the fiscal year ended
October 31, 1998 included in this STATEMENT OF ADDITIONAL INFORMATION and
incorporated by reference in the PROSPECTUS have been so included and
incorporated in reliance on the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of said firm as experts in
auditing and accounting.
    
 
                                     *****
 
    This STATEMENT OF ADDITIONAL INFORMATION and the PROSPECTUS do not contain
all of the information set forth in the REGISTRATION STATEMENT the Fund has
filed with the SEC. The complete REGISTRATION STATEMENT may be obtained from the
SEC.
 
                                       33
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
PORTFOLIO OF INVESTMENTS OCTOBER 31, 1998
 
<TABLE>
<CAPTION>
PRINCIPAL                              DESCRIPTION
AMOUNT IN                                  AND                                  COUPON
THOUSANDS                             MATURITY DATE                              RATE       VALUE
- -----------------------------------------------------------------------------------------------------
<C>        <S>                                                                  <C>      <C>
           U.S. GOVERNMENT & AGENCY OBLIGATIONS (69.5%)
           U.S. Government Agencies (8.2%)
$ 10,000   Federal Farm Credit Bank 12/20/04..................................   6.55%   $ 10,200,900
  12,000   Federal Home Loan Banks 07/02/12...................................   0.00       4,205,280
   4,400   Federal National Mortgage Assoc. 09/25/07..........................   6.85       4,550,216
   5,000   Federal National Mortgage Assoc. 12/24/07..........................   6.48       5,168,750
  42,000   Resolution Funding Strip 04/15/05-10/15/07.........................   0.00      29,242,740
                                                                                         ------------
                                                                                           53,367,886
                                                                                         ------------
 
           U.S. Treasury Bonds (60.8%)
  20,000   11/15/15*..........................................................   9.875     30,268,200
  22,000   11/15/12...........................................................  10.375     30,733,780
 186,600   08/15/13*..........................................................  12.00     288,108,534
  30,000   11/15/11...........................................................  14.00      48,160,200
                                                                                         ------------
                                                                                          397,270,714
                                                                                         ------------
 
           U.S. Treasury Strip (0.5%)
   5,000   02/15/07...........................................................   0.00       3,366,200
                                                                                         ------------
 
           TOTAL U.S. GOVERNMENT & AGENCY OBLIGATIONS
           (IDENTIFIED COST $398,239,720).............................................    454,004,800
                                                                                         ------------
 
           MORTGAGE-BACKED SECURITIES (19.6%)
           Federal Home Loan Mortgage Corp. (4.0%)
  16,495   10/01/10...........................................................   9.50      17,515,495
   6,570   10/01/19...........................................................  10.00       7,080,767
   1,657   10/01/18...........................................................  10.50       1,807,777
                                                                                         ------------
                                                                                           26,404,039
                                                                                         ------------
 
           Federal National Mortgage Assoc. (6.5%)
  10,000   11/01/28+..........................................................   6.00       9,875,000
  14,639   12/01/23...........................................................   6.50      14,744,237
   3,165   12/01/26...........................................................   7.50       3,244,631
   8,262   06/01/25...........................................................   8.00       8,541,118
   4,476   03/01/22...........................................................   8.50       4,659,045
   1,103   02/01/20...........................................................   9.50       1,176,443
     127   03/01/16...........................................................   9.75         136,386
                                                                                         ------------
                                                                                           42,376,860
                                                                                         ------------
 
           Government National Mortgage Assoc. (9.1%)
  27,062   12/15/22...........................................................   7.00      27,679,649
  20,031   06/15/17...........................................................   7.50      20,638,520
   9,932   12/15/20...........................................................   8.50      10,490,937
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       34
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
PORTFOLIO OF INVESTMENTS OCTOBER 31, 1998, CONTINUED
 
<TABLE>
<CAPTION>
PRINCIPAL                              DESCRIPTION
AMOUNT IN                                  AND                                  COUPON
THOUSANDS                             MATURITY DATE                              RATE       VALUE
- -----------------------------------------------------------------------------------------------------
<C>        <S>                                                                  <C>      <C>
$    757   05/15/16...........................................................  10.00%   $    826,238
      94   09/15/18...........................................................  11.00         103,970
                                                                                         ------------
                                                                                           59,739,314
                                                                                         ------------
 
           TOTAL MORTGAGE-BACKED SECURITIES
           (IDENTIFIED COST $124,317,460).............................................    128,520,213
                                                                                         ------------
 
           SHORT-TERM INVESTMENTS (a) (10.8%)
           U.S. GOVERNMENT & AGENCY OBLIGATIONS
  29,270   Federal Home Loan Mortgage Corp.
             11/02/98-11/12/98................................................  5.10-5.42   29,231,936
  18,000   Federal National Mortgage Assoc. 11/06/98..........................   4.75      17,988,125
  20,000   Tennessee Valley Authority 11/02/98................................   4.75      19,997,363
   3,000   U.S. Treasury Bill 11/12/98........................................   5.258      2,995,355
                                                                                         ------------
 
           TOTAL SHORT-TERM INVESTMENTS
           (IDENTIFIED COST $70,212,604)..............................................     70,212,779
                                                                                         ------------
 
           TOTAL INVESTMENTS
           (IDENTIFIED COST $592,769,784).............................................    652,737,792
                                                                                         ------------
</TABLE>
 
<TABLE>
<CAPTION>
                         DESCRIPTION,
NUMBER OF              EXPIRATION DATE,
CONTRACTS              AND STRIKE PRICE
- ---------              ----------------
<C>        <S>         <C>                <C>           <C>
</TABLE>
 
<TABLE>
<C>      <S>                                                                         <C>
         WRITTEN OPTIONS (b) (0.1%)
         Call options on Treasury bond futures
    200  December/1998/126.........................................................      (650,000)
    100  December/1998/133.........................................................       (18,750)
                                                                                     ----------------
 
         TOTAL WRITTEN OPTIONS (PREMIUMS RECEIVED $205,963)........................      (668,750)**
                                                                                     ----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       35
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
PORTFOLIO OF INVESTMENTS OCTOBER 31, 1998, CONTINUED
 
<TABLE>
<CAPTION>
                                                                                                               VALUE
- --------------------------------------------------------------------------------------------------------------------
<C>      <S>                                                                         <C>                <C>
TOTAL INVESTMENTS
(IDENTIFIED COST $592,769,784) (c)........................................................   99.9%    $  652,737,792
 
TOTAL WRITTEN OPTIONS OUTSTANDING.........................................................   (0.1)          (668,750)
 
CASH AND OTHER ASSETS IN EXCESS OF LIABILITIES............................................    0.2          1,197,676
                                                                                            -------   --------------
 
NET ASSETS................................................................................  100.0%    $  653,266,718
                                                                                            -------   --------------
                                                                                            -------   --------------
</TABLE>
 
- ---------------------
 
 *   Some of these securities are segregated in connection with open written
     options, open futures contracts and securities purchased on a forward
     commitment basis.
**   The market value of U.S. Treasury securities pledged to cover written
     options on futures contracts is $1,118,750.
 +   Security purchased on a forward commitment basis with an approximate
     principal amount. The actual principal will be determined upon settlement.
(a)  Securities were purchased on a discount basis. The interest rates shown
     have been adjusted to reflect a money market equivalent yield.
(b)  Options expire one month prior to the expiration date indicated for
     Treasury bond futures.
(c)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $60,056,443 and the
     aggregate gross unrealized depreciation is $88,435, resulting in net
     unrealized depreciation of $59,968,008.
 
FUTURES CONTRACTS OPEN AT OCTOBER 31, 1998:
 
<TABLE>
<CAPTION>
                                                                              UNDERLYING
   NUMBER OF                   DESCRIPTION, DELIVERY MONTH,                  FACE AMOUNT     UNREALIZED
   CONTRACTS                             AND YEAR                              AT VALUE         LOSS
- --------------------------------------------------------------------------------------------------------
<S>              <C>                                                        <C>             <C>
         400     U.S. Treasury Bonds December/1998........................  $   51,562,500   $ (362,500)
                                                                            --------------  ------------
                                                                            --------------  ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       36
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
OCTOBER 31, 1998
 
<TABLE>
<S>                                                                                             <C>
ASSETS:
Investments in securities, at value
  (identified cost $592,769,784)..............................................................  $652,737,792
Cash..........................................................................................       205,519
Receivable for:
    Interest..................................................................................    10,017,532
    Shares of beneficial interest sold........................................................     2,366,200
    Principal paydowns........................................................................       560,970
Prepaid expenses and other assets.............................................................        68,365
                                                                                                ------------
     TOTAL ASSETS.............................................................................   665,956,378
                                                                                                ------------
LIABILITIES:
Written call options outstanding, at value (premiums received $205,963).......................       668,750
Payable for:
    Investments purchased.....................................................................     9,876,145
    Shares of beneficial interest repurchased.................................................       547,815
    Plan of distribution fee..................................................................       469,162
    Variation margin on futures contracts.....................................................       337,500
    Investment management fee.................................................................       305,756
    Dividends to shareholders.................................................................       300,229
    Options purchased.........................................................................        24,055
Accrued expenses and other payables...........................................................       160,248
                                                                                                ------------
     TOTAL LIABILITIES........................................................................    12,689,660
                                                                                                ------------
     NET ASSETS...............................................................................  $653,266,718
                                                                                                ------------
                                                                                                ------------
COMPOSITION OF NET ASSETS:
Paid-in-capital...............................................................................  $641,992,994
Net unrealized appreciation...................................................................    58,738,112
Accumulated net realized loss.................................................................   (47,464,388)
                                                                                                ------------
     NET ASSETS...............................................................................  $653,266,718
                                                                                                ------------
                                                                                                ------------
CLASS A SHARES:
Net Assets....................................................................................    $4,893,727
Shares Outstanding (UNLIMITED AUTHORIZED, $.01 PAR VALUE).....................................       499,626
     NET ASSET VALUE PER SHARE................................................................         $9.79
                                                                                                ------------
                                                                                                ------------
     MAXIMUM OFFERING PRICE PER SHARE,
       (NET ASSET VALUE PLUS 4.44% OF NET ASSET VALUE)........................................        $10.22
                                                                                                ------------
                                                                                                ------------
CLASS B SHARES:
Net Assets....................................................................................  $639,212,484
Shares Outstanding (UNLIMITED AUTHORIZED, $.01 PAR VALUE).....................................    65,732,418
     NET ASSET VALUE PER SHARE................................................................         $9.72
                                                                                                ------------
                                                                                                ------------
CLASS C SHARES:
Net Assets....................................................................................    $7,204,246
Shares Outstanding (UNLIMITED AUTHORIZED, $.01 PAR VALUE).....................................       735,359
     NET ASSET VALUE PER SHARE................................................................         $9.80
                                                                                                ------------
                                                                                                ------------
CLASS D SHARES:
Net Assets....................................................................................    $1,956,261
Shares Outstanding (UNLIMITED AUTHORIZED, $.01 PAR VALUE).....................................       201,911
     NET ASSET VALUE PER SHARE................................................................         $9.69
                                                                                                ------------
                                                                                                ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       37
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED OCTOBER 31, 1998
 
<TABLE>
<S>                                                                                              <C>
NET INVESTMENT INCOME:
 
INTEREST INCOME................................................................................  $47,209,827
                                                                                                 -----------
 
EXPENSES
Plan of distribution fee (Class A shares)......................................................        6,915
Plan of distribution fee (Class B shares)......................................................    5,200,730
Plan of distribution fee (Class C shares)......................................................       27,553
Investment management fee......................................................................    3,403,780
Transfer agent fees and expenses...............................................................      527,283
Custodian fees.................................................................................       81,956
Shareholder reports and notices................................................................       72,434
Professional fees..............................................................................       70,006
Registration fees..............................................................................       56,791
Trustees' fees and expenses....................................................................       18,983
Other..........................................................................................       22,755
                                                                                                 -----------
 
     TOTAL EXPENSES............................................................................    9,489,186
                                                                                                 -----------
 
     NET INVESTMENT INCOME.....................................................................   37,720,641
                                                                                                 -----------
 
NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized gain/loss on:
    Investments................................................................................      140,594
    Futures contracts..........................................................................   (1,128,069)
    Options written............................................................................    1,694,186
                                                                                                 -----------
 
     NET GAIN..................................................................................      706,711
 
Net change in unrealized appreciation..........................................................   22,700,373
                                                                                                 -----------
 
     NET GAIN..................................................................................   23,407,084
                                                                                                 -----------
 
NET INCREASE...................................................................................  $61,127,725
                                                                                                 -----------
                                                                                                 -----------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       38
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                                                     FOR THE YEAR         FOR THE YEAR
                                                                                        ENDED                ENDED
                                                                                   OCTOBER 31,1998     OCTOBER 31, 1997*
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                               <C>                  <C>
 
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income...........................................................      $  37,720,641        $  42,168,046
Net realized gain...............................................................            706,711              690,276
Net change in unrealized appreciation...........................................         22,700,373            5,646,142
                                                                                  ------------------   ------------------
 
     NET INCREASE...............................................................         61,127,725           48,504,464
                                                                                  ------------------   ------------------
 
DIVIDENDS TO SHAREHOLDERS FROM NET INVESTMENT INCOME:
Class A shares..................................................................           (189,298)             (28,596)
Class B shares..................................................................        (37,280,239)         (42,134,728)
Class C shares..................................................................           (191,250)              (4,477)
Class D shares..................................................................            (59,854)                (245)
                                                                                  ------------------   ------------------
 
     TOTAL DIVIDENDS............................................................        (37,720,641)         (42,168,046)
                                                                                  ------------------   ------------------
Net increase (decrease) from transactions in shares of beneficial interest......          3,969,420         (100,380,918)
                                                                                  ------------------   ------------------
 
     NET INCREASE (DECREASE)....................................................         27,376,504          (94,044,500)
 
NET ASSETS:
Beginning of period.............................................................        625,890,214          719,934,714
                                                                                  ------------------   ------------------
 
     END OF PERIOD..............................................................      $ 653,266,718        $ 625,890,214
                                                                                  ------------------   ------------------
                                                                                  ------------------   ------------------
</TABLE>
 
- ---------------------
 
 *   Class A, Class B and Class C shares were issued July 28, 1997.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       39
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1998
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Morgan Stanley Dean Witter Federal Securities Trust (the "Fund"), formerly Dean
Witter Federal Securities Trust, is registered under the Investment Company Act
of 1940, as amended (the "Act"), as a diversified, open-end management
investment company. The Fund's investment objective is to earn a high level of
current income. The Fund commenced operations on March 31, 1987. On July 28,
1997, the Fund commenced offering three additional classes of shares, with the
then current shares designated as Class B shares.
 
The Fund offers Class A shares, Class B shares, Class C shares and Class D
shares. The four classes are substantially the same except that most Class A
shares are subject to a sales charge imposed at the time of purchase and some
Class A shares, and most Class B shares and Class C shares are subject to a
contingent deferred sales charge imposed on shares redeemed within one year, six
years and one year, respectively. Class D shares are not subject to a sales
charge. Additionally, Class A shares, Class B shares and Class C shares incur
distribution expenses.
 
The preparation of financial statements in accordance with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts and disclosures. Actual results could differ from
those estimates.
 
The following is a summary of significant accounting policies:
 
A. VALUATION OF INVESTMENTS --  (1) all portfolio securities for which
over-the-counter market quotations are readily available are valued at the
latest available bid price prior to the time of valuation; (2) listed options
are valued at the latest sale price on the exchange on which they are listed
unless no sales of such options have taken place that day, in which case they
are valued at the mean between their latest bid and asked price; (3) futures
contracts are valued at the latest sale price as of the close of the commodities
exchange on which it trades unless the Trustees determine that such price does
not reflect their market value, in which case it will be valued at fair value as
determined by the Trustees; (4) when market quotations are not readily
available, including circumstances under which it is determined by Morgan
Stanley Dean Witter Advisors Inc. (the "Investment Manager"), formerly Dean
Witter InterCapital Inc., that the sale or bid prices are not reflective of a
security's market value, portfolio securities are valued at their fair value as
determined in good faith under procedures established by and under the general
supervision of the Trustees (valuation of debt securities for which market
quotations are not readily available may be based upon current market prices of
securities which are comparable in coupon, rating and maturity or an appropriate
matrix utilizing similar factors); and (5) short-term debt securities having a
 
                                       40
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1998, CONTINUED
 
maturity date of more than sixty days at the time of purchase are valued on a
mark-to-market basis until sixty days prior to maturity and thereafter at
amortized cost based on their value on the 61st day. Short-term debt securities
having a maturity date of sixty days or less at the time of purchase are valued
at amortized cost.
 
B. ACCOUNTING FOR INVESTMENTS --  Security transactions are accounted for on the
trade date (date the order to buy or sell is executed). Realized gains and
losses on security transactions are determined by the identified cost method.
Discounts are accreted over the life of the respective securities. Interest
income is accrued daily.
 
C. MULTIPLE CLASS ALLOCATIONS --  Investment income, expenses (other than
distribution fees), and realized and unrealized gains and losses are allocated
to each class of shares based upon the relative net asset value on the date such
items are recognized. Distribution fees are charged directly to the respective
class.
 
D. OPTIONS AND FUTURES --  (1) Written options on debt obligations: When the
Fund writes a call or put option, an amount equal to the premium received is
included in the Fund's Statement of Assets and Liabilities as a liability which
is subsequently marked-to-market to reflect the current market value. If a
written option either expires or the Fund enters into a closing purchase
transaction, the Fund realizes a gain or loss without regard to any unrealized
gain or loss on the underlying security and the liability related to such option
is extinguished. If a written call option is exercised, the Fund realizes a gain
or loss from the sale of the underlying security and the proceeds from such sale
are increased by the premium originally received. If a written put option is
exercised, the amount of the premium originally received reduces the cost of the
security which the Fund purchases upon exercise of the option; (2) Purchased
options on debt obligations: When the Fund purchases a call or put option, the
premium paid is recorded as an investment which is subsequently marked-to-market
to reflect the current market value. If a purchased option expires, the Fund
will realize a loss to the extent of the premium paid. If the Fund enters into a
closing sale transaction, a gain or loss is realized for the difference between
the proceeds from the sale and the cost of the option. If a put option is
exercised, the cost of the security sold upon exercise will be increased by the
premium originally paid. If a call option is exercised, the cost of the security
purchased upon exercise will be increased by the premium originally paid; (3)
Options on futures contracts: The Fund is required to deposit cash, U.S.
Government securities or other liquid portfolio securities as "initial margin"
and "variation margin" with respect to written call and put options on futures
contracts. If a written option expires, the Fund realizes a gain. If a written
call or put option is exercised, the premium received will decrease or increase
the unrealized loss or gain on the futures contract. If the Fund enters into a
closing purchase transaction, the Fund realizes a gain or loss without regard to
any unrealized gain or loss on the
 
                                       41
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1998, CONTINUED
 
underlying futures contract and the liability related to such option is
extinguished; (4) Futures contracts: A futures contract is an agreement between
two parties to buy and sell financial instruments at a set price on a future
date. Upon entering into such a contract, the Fund is required to pledge to the
broker cash, U.S. Government securities or other liquid portfolio securities
equal to the minimum initial margin requirements of the applicable futures
exchange. Pursuant to the contract, the Fund agrees to receive from or pay to
the broker an amount of cash equal to the daily fluctuation in the value of the
contract. Such receipts or payments known as variation margin are recorded by
the Fund as unrealized gains or losses. Upon closing of the contract, the Fund
realizes a 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.
 
E. FEDERAL INCOME TAX STATUS --  It is the Fund's policy to comply with the
requirements of the Internal Revenue Code applicable to regulated investment
companies and to distribute all of its taxable income to its shareholders.
Accordingly, no federal income tax provision is required.
 
F. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS --  The Fund records dividends
and distributions to its shareholders on the ex-dividend date. The amount of
dividends and distributions from net investment income and net realized capital
gains are determined in accordance with federal income tax regulations which may
differ from generally accepted accounting principles. These "book/tax"
differences are either considered temporary or permanent in nature. To the
extent these differences are permanent in nature, such amounts are reclassified
within the capital accounts based on their federal tax-basis treatment;
temporary differences do not require reclassification. Dividends and
distributions which exceed net investment income and net realized capital gains
for financial reporting purposes but not for tax purposes are reported as
dividends in excess of net investment income or distributions in excess of net
realized capital gains. To the extent they exceed net investment income and net
realized capital gains for tax purposes, they are reported as distributions of
paid-in-capital.
 
2. INVESTMENT MANAGEMENT AGREEMENT
 
Pursuant to an Investment Management Agreement with the Investment Manager the
Fund pays a management fee, accrued daily and payable monthly, by applying the
following annual rates to the Fund's net assets determined at the close of each
business day: 0.55% to the portion of daily net assets not exceeding $1 billion;
0.525% to the portion of daily net assets exceeding $1 billion but not exceeding
$1.5 billion; 0.50% to the portion of daily net assets exceeding $1.5 billion
but not exceeding $2 billion; 0.475% to the portion of daily net assets
exceeding $2 billion but not exceeding $2.5 billion; 0.45% to the portion of
daily net assets exceeding $2.5 billion but not exceeding $5 billion; 0.425% to
the portion of daily net
 
                                       42
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1998, CONTINUED
 
assets exceeding $5 billion but not exceeding $7.5 billion; 0.40% to the portion
of daily net assets exceeding $7.5 billion but not exceeding $10 billion; 0.375%
to the portion of daily net assets exceeding $10 billion but not exceeding $12.5
billion; and 0.35% to the portion of daily net assets exceeding $12.5 billion.
 
Under the terms of the Agreement, in addition to managing the Fund's
investments, the Investment Manager maintains certain of the Fund's books and
records and furnishes, at its own expense, office space, facilities, equipment,
clerical, bookkeeping and certain legal services and pays the salaries of all
personnel, including officers of the Fund who are employees of the Investment
Manager. The Investment Manager also bears the cost of telephone services, heat,
light, power and other utilities provided to the Fund.
 
3. PLAN OF DISTRIBUTION
 
Shares of the Fund are distributed by Morgan Stanley Dean Witter Distributors
Inc. (the "Distributor"), an affiliate of the Investment Manager. The Fund has
adopted a Plan of Distribution (the "Plan") pursuant to Rule 12b-1 under the
Act. The Plan provides that the Fund will pay the Distributor a fee which is
accrued daily and paid monthly at the following annual rates: (i) Class A -- up
to 0.25% of the average daily net assets of Class A; (ii) Class B -- 0.85% of
the lesser of: (a) the average daily aggregate gross sales of the Class B shares
since the inception of the Fund (not including reinvestment of dividend or
capital gain distributions) less the average daily aggregate net asset value of
the Class B shares redeemed since the Fund's inception upon which a contingent
deferred sales charge has been imposed or waived; or (b) the average daily net
assets of Class B; and (iii) Class C -- up to 0.85% of the average daily net
assets of Class C. In the case of Class A shares, amounts paid under the Plan
are paid to the Distributor for services provided. In the case of Class B and
Class C shares, amounts paid under the Plan are paid to the Distributor for (1)
services provided and the expenses borne by it and others in the distribution of
the shares of these Classes, including the payment of commissions for sales of
these Classes and incentive compensation to, and expenses of, Morgan Stanley
Dean Witter Financial Advisors and others who engage in or support distribution
of the shares or who service shareholder accounts, including overhead and
telephone expenses; (2) printing and distribution of prospectuses and reports
used in connection with the offering of these shares to other than current
shareholders; and (3) preparation, printing and distribution of sales literature
and advertising materials. In addition, the Distributor may utilize fees paid
pursuant to the Plan, in the case of Class B shares, to compensate Dean Witter
Reynolds Inc. ("DWR"), an affiliate of the Investment Manager and Distributor,
and other selected broker-dealers for their opportunity costs in advancing such
amounts, which compensation would be in the form of a carrying charge on any
unreimbursed expenses.
 
                                       43
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1998, CONTINUED
 
In the case of Class B shares, provided that the Plan continues in effect, any
cumulative expenses incurred by the Distributor but not yet recovered may be
recovered through the payment of future distribution fees from the Fund pursuant
to the Plan and contingent deferred sales charges paid by investors upon
redemption of Class B shares. Although there is no legal obligation for the Fund
to pay expenses incurred in excess of payments made to the Distributor under the
Plan and the proceeds of contingent deferred sales charges paid by investors
upon redemption of shares, if for any reason the Plan is terminated, the
Trustees will consider at that time the manner in which to treat such expenses.
The Distributor has advised the Fund that such excess amounts, including
carrying charges, totaled $22,724,037 at October 31, 1998.
 
In the case of Class A shares and Class C shares, expenses incurred pursuant to
the Plan in any calendar year in excess of 0.25% or 0.85% of the average daily
net assets of Class A or Class C, respectively, will not be reimbursed by the
Fund through payments in any subsequent year, except that expenses representing
a gross sales credit to Morgan Stanley Dean Witter Financial Advisors or other
selected broker-dealer representatives may be reimbursed in the subsequent
calendar year. For the year ended October 31, 1998, the distribution fee was
accrued for Class A shares and Class C shares at the annual rate of 0.24% and
0.85%, respectively.
 
The Distributor has informed the Fund that for the year ended October 31, 1998,
it received contingent deferred sales charges from certain redemptions of the
Fund's Class A shares, Class B shares and Class C shares of $13,094, $473,113
and $2,026, respectively and received $25,619 in front-end sales charges from
sales of the Fund's Class A shares. The respective shareholders pay such charges
which are not an expense of the Fund.
 
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
Purchases and sales/prepayments of portfolio securities, excluding short-term
investments, for the year ended October 31, 1998 were $77,082,599 and
$109,372,764, respectively.
 
Transactions in written options for the year ended October 31, 1998 were as
follows:
 
<TABLE>
<CAPTION>
                                                                    CONTRACTS     PREMIUMS
                                                                   -----------   -----------
<S>                                                                <C>           <C>
Option contracts written, outstanding at beginning of the
 period..........................................................         200    $    95,642
Options written..................................................      11,551      6,454,664
Options closed...................................................     (10,001)    (5,785,302)
Options exercised................................................        (850)      (448,508)
Options expired..................................................        (600)      (110,533)
                                                                   -----------   -----------
Option contracts written, outstanding at end of the period.......         300    $   205,963
                                                                   -----------   -----------
                                                                   -----------   -----------
</TABLE>
 
                                       44
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1998, CONTINUED
 
For the year ended October 31, 1998, the Fund incurred brokerage commissions
with DWR for transactions executed and for clearing options and futures
transactions, on behalf of the Fund in the amount of $450 and $4,339,
respectively.
 
Morgan Stanley Dean Witter Trust FSB, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At October 31, 1998, the Fund had
transfer agent fees and expenses payable of approximately $3,800.
 
The Fund has unfunded noncontributory defined benefit pension plan covering all
independent Trustees of the Fund who will have served as independent Trustees
for at least five years at the time of retirement. Benefits under this plan are
based on years of service and compensation during the last five years of
service. Aggregate pension costs for the year ended October 31, 1998 included in
Trustees' fees and expenses in the Statement of Operations amounted to $5,657.
At October 31, 1998, the Fund had an accrued pension liability of $51,159 which
is included in accrued expenses in the Statement of Assets and Liabilities.
 
5. FEDERAL INCOME TAX STATUS
 
During the year ended October 31, 1998, the Fund utilized approximately
$1,750,000 of its net capital loss carryover. At October 31, 1998, the Fund had
a net capital loss carryover of approximately $35,668,000, which may be used to
offset future capital gains to the extent provided by regulations, which is
available through October 31 of the following years:
 
<TABLE>
<CAPTION>
       AMOUNT IN THOUSANDS
- ---------------------------------
  2000        2002        2004
- ---------  -----------  ---------
<S>        <C>          <C>
$   3,854  $    31,124  $     690
- ---------  -----------  ---------
- ---------  -----------  ---------
</TABLE>
 
At October 31, 1998, the Fund was required for Federal income tax purposes to
defer approximately $11,816,000 of realized losses on certain closed options and
futures contracts.
 
As of October 31, 1998, the Fund had temporary book/tax differences primarily
attributable to capital loss deferrals on straddles and permanent book/tax
differences attributable to an expired capital loss carryover. To reflect
reclassifications arising from the permanent differences, paid-in-capital was
charged and accumulated net realized loss was credited $5,115,395.
 
                                       45
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1998, CONTINUED
 
6. SHARES OF BENEFICIAL INTEREST
 
Transactions in shares of beneficial interest were as follows:
 
<TABLE>
<CAPTION>
                                                                           FOR THE YEAR                  FOR THE YEAR
                                                                              ENDED                          ENDED
                                                                         OCTOBER 31, 1998              OCTOBER 31, 1997*
                                                                   ----------------------------   ---------------------------
                                                                     SHARES          AMOUNT         SHARES         AMOUNT
                                                                   -----------   --------------   -----------   -------------
<S>                                                                <C>           <C>              <C>           <C>
CLASS A SHARES
Sold.............................................................      494,041   $    4,730,315       227,350   $   2,100,734
Reinvestment of dividends........................................       17,202          164,344         2,813          26,335
Redeemed.........................................................     (228,754)      (2,193,283)      (13,026)       (121,600)
                                                                   -----------   --------------   -----------   -------------
Net increase - Class A...........................................      282,489        2,701,376       217,137       2,005,469
                                                                   -----------   --------------   -----------   -------------
CLASS B SHARES
Sold.............................................................   11,059,549      105,850,540     5,820,412      53,293,625
Reinvestment of dividends........................................    2,135,874       20,213,190     2,488,705      22,774,438
Redeemed.........................................................  (14,006,213)    (132,953,963)  (19,576,326)   (179,236,735)
                                                                   -----------   --------------   -----------   -------------
Net decrease - Class B...........................................     (810,790)      (6,890,233)  (11,267,209)   (103,168,672)
                                                                   -----------   --------------   -----------   -------------
CLASS C SHARES
Sold.............................................................      698,033        6,700,213        80,710         753,751
Reinvestment of dividends........................................       14,425          138,550           270           2,532
Redeemed.........................................................      (53,457)        (517,787)       (4,622)        (42,939)
                                                                   -----------   --------------   -----------   -------------
Net increase - Class C...........................................      659,001        6,320,976        76,358         713,344
                                                                   -----------   --------------   -----------   -------------
CLASS D SHARES
Sold.............................................................      203,672        1,924,311         7,413          68,718
Reinvestment of dividends........................................        5,200           49,434            24             223
Redeemed.........................................................      (14,398)        (136,444)      --             --
                                                                   -----------   --------------   -----------   -------------
Net increase - Class D...........................................      194,474        1,837,301         7,437          68,941
                                                                   -----------   --------------   -----------   -------------
Net increase (decrease) in Fund..................................      325,174   $    3,969,420   (10,966,277)  $(100,380,918)
                                                                   -----------   --------------   -----------   -------------
                                                                   -----------   --------------   -----------   -------------
</TABLE>
 
- ---------------------
 
 *   For Class A, C and D shares, for the period July 28, 1997 (issue date)
     through October 31, 1997.
 
7. PURPOSES OF AND RISKS RELATING TO CERTAIN FINANCIAL INSTRUMENTS
 
To hedge against adverse interest rate and market risks on portfolio positions
or anticipated positions in U.S. Government securities, or in the case of
written options, to close out long or short positions in futures contracts, the
Fund may enter into written options on interest rate futures and interest rate
futures contracts ("derivative instruments").
 
These derivative instruments involve elements of market risk in excess of the
amount reflected in the Statement of Assets and Liabilities. The Fund bears the
risk of an unfavorable change in the value of the underlying securities or
currencies.
 
At October 31, 1998, the Fund had outstanding written options on interest rate
futures and interest rate futures used to manage interest rate and market
exposure on portfolio positions or anticipated positions in U.S. Government
securities.
 
                                       46
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL HIGHLIGHTS
 
Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
 
<TABLE>
<CAPTION>
                                                                  FOR THE YEAR ENDED OCTOBER 31,
                                                    -----------------------------------------------------------
                                                     1998         1997*        1996         1995         1994
- ---------------------------------------------------------------------------------------------------------------
 
<S>                                                 <C>          <C>          <C>          <C>          <C>
CLASS B SHARES
 
SELECTED PER SHARE DATA:
 
Net asset value, beginning of period...........     $  9.36      $  9.25      $  9.49      $  8.74      $ 10.03
                                                    -------      -------      -------      -------      -------
 
Income (loss) from investment operations:
   Net investment income.......................        0.58         0.59         0.59         0.59         0.60
   Net realized and unrealized gain (loss).....        0.36         0.11        (0.25)        0.75        (1.28)
                                                    -------      -------      -------      -------      -------
 
Total income (loss) from investment
 operations....................................        0.94         0.70         0.34         1.34        (0.68)
                                                    -------      -------      -------      -------      -------
 
Less dividends from net investment income......       (0.58)       (0.59)       (0.58)       (0.59)       (0.61)
                                                    -------      -------      -------      -------      -------
 
Net asset value, end of period.................     $  9.72      $  9.36      $  9.25      $  9.49      $  8.74
                                                    -------      -------      -------      -------      -------
                                                    -------      -------      -------      -------      -------
 
TOTAL RETURN+..................................       10.35%        7.89%        3.79%       15.89%       (6.92)%
 
RATIOS TO AVERAGE NET ASSETS:
 
Expenses.......................................        1.54%(1)     1.53%        1.53%        1.52%        1.52%
 
Net investment income..........................        6.09%(1)     6.41%        6.31%        6.53%        6.56%
 
SUPPLEMENTAL DATA:
 
Net assets, end of period, in millions.........        $639         $623         $720         $829         $841
 
Portfolio turnover rate........................          13%          12%          10%           7%          18%
</TABLE>
 
- ---------------------
 
<TABLE>
<C>    <S>
 *     Prior to July 28, 1997, the Fund issued one class of shares. All shares of the
       Fund held prior to that date have been designated Class B shares.
 +     Does not reflect the deduction of sales charge. Calculated based on the net
       asset value as of the last business day of the period.
(1)    Reflects overall Fund ratios for investment income and non-class specific
       expenses.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       47
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL HIGHLIGHTS, CONTINUED
 
<TABLE>
<CAPTION>
                                                                                            FOR THE PERIOD
                                                                          FOR THE YEAR      JULY 28, 1997*
                                                                             ENDED             THROUGH
                                                                        OCTOBER 31, 1998   OCTOBER 31, 1997
- -----------------------------------------------------------------------------------------------------------
<S>                                                                     <C>                <C>
CLASS A SHARES
SELECTED PER SHARE DATA:
Net asset value, beginning of period..................................      $  9.45            $  9.26
                                                                              -----              -----
Income from investment operations:
   Net investment income..............................................         0.64               0.16
   Net realized and unrealized gain...................................         0.34               0.19
                                                                              -----              -----
Total income from investment operations...............................         0.98               0.35
                                                                              -----              -----
Less dividends from net investment income.............................        (0.64)             (0.16)
                                                                              -----              -----
Net asset value, end of period........................................      $  9.79            $  9.45
                                                                              -----              -----
                                                                              -----              -----
TOTAL RETURN+.........................................................        10.75%              3.78%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         0.93%(3)           0.92%(2)
Net investment income.................................................         6.70%(3)           6.60%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................       $4,894             $2,051
Portfolio turnover rate...............................................           13%                12%
</TABLE>
 
<TABLE>
<S>                                                                     <C>                <C>
CLASS C SHARES
SELECTED PER SHARE DATA:
Net asset value, beginning of period..................................      $  9.44            $  9.26
                                                                              -----              -----
Income from investment operations:
   Net investment income..............................................         0.58               0.15
   Net realized and unrealized gain...................................         0.36               0.18
                                                                              -----              -----
Total income from investment operations...............................         0.94               0.33
                                                                              -----              -----
Less dividends from net investment income.............................        (0.58)             (0.15)
                                                                              -----              -----
Net asset value, end of period........................................      $  9.80            $  9.44
                                                                              -----              -----
                                                                              -----              -----
TOTAL RETURN+.........................................................        10.30%              3.54%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         1.54%(3)           1.52%(2)
Net investment income.................................................         6.09%(3)           5.86%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................       $7,204               $721
Portfolio turnover rate...............................................           13%                12%
</TABLE>
 
- ---------------------
 
<TABLE>
<C>    <S>
 *     The date shares were first issued.
 +     Does not reflect the deduction of sales charge. Calculated based on the net
       asset value as of the last business day of the period.
(1)    Not annualized.
(2)    Annualized.
(3)    Reflects overall Fund ratios for investment income and non-class specific
       expenses.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       48
<PAGE>
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL HIGHLIGHTS, CONTINUED
 
<TABLE>
<CAPTION>
                                                                                            FOR THE PERIOD
                                                                          FOR THE YEAR      JULY 28, 1997*
                                                                             ENDED             THROUGH
                                                                        OCTOBER 31, 1998   OCTOBER 31, 1997
- -----------------------------------------------------------------------------------------------------------
 
<S>                                                                     <C>                <C>
CLASS D SHARES
 
SELECTED PER SHARE DATA:
Net asset value, beginning of period..................................      $  9.33            $  9.26
                                                                              -----              -----
 
Income from investment operations:
   Net investment income..............................................         0.66               0.17
   Net realized and unrealized gain...................................         0.36               0.07
                                                                              -----              -----
 
Total income from investment operations...............................         1.02               0.24
                                                                              -----              -----
 
Less dividends from net investment income.............................        (0.66)             (0.17)
                                                                              -----              -----
 
Net asset value, end of period........................................      $  9.69            $  9.33
                                                                              -----              -----
                                                                              -----              -----
 
TOTAL RETURN+.........................................................        11.30%              2.62%(1)
 
RATIOS TO AVERAGE NET ASSETS:
 
Expenses..............................................................         0.69%(3)           0.63%(2)
 
Net investment income.................................................         6.94%(3)           6.40%(2)
 
SUPPLEMENTAL DATA:
 
Net assets, end of period, in thousands...............................       $1,956                $69
 
Portfolio turnover rate...............................................           13%                12%
</TABLE>
 
- ---------------------
 
<TABLE>
<C>    <S>
 *     The date shares were first issued.
 +     Calculated based on the net asset value as of the last business day of the
       period.
(1)    Not annualized.
(2)    Annualized.
(3)    Reflects overall Fund ratios for investment income and non-class specific
       expenses.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       49
<PAGE>
 
MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES
TRUST
REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE SHAREHOLDERS AND TRUSTEES
OF MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST
 
In our opinion, the accompanying statement of assets and liabilities, including
the portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights present fairly, in all
material respects, the financial position of Morgan Stanley Dean Witter Federal
Securities Trust (the "Fund"), formerly Dean Witter Federal Securities Trust, at
October 31, 1998, the results of its operations for the year then ended, the
changes in its net assets for each of the two years in the period then ended and
the financial highlights for each of the periods presented, in conformity with
generally accepted accounting principles. These financial statements and
financial highlights (hereafter referred to as "financial statements") are the
responsibility of the Fund's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these financial statements in accordance with generally accepted
auditing standards which require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits, which included confirmation of securities at October 31, 1998 by
correspondence with the custodian and brokers, provide a reasonable basis for
the opinion expressed above.
 
PricewaterhouseCoopers LLP
1177 AVENUE OF THE AMERICAS
NEW YORK, NEW YORK 10036
DECEMBER 7, 1998
 
                                       50
<PAGE>

                 MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST

                               PART C OTHER INFORMATION

Item 23.  Exhibits

      2.  --   Form of Amended and Restated By-Laws of the Registrant.

     10.  --   Consent of Independent Accountants.

     14.  --   Financial Data Schedules.

- --------------------------------------------------------------------------------

     All other exhibits were previously filed via EDGAR and are hereby
     incorporated by reference.

Item 24.    PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH THE FUND

            None

Item 25.    INDEMNIFICATION

     Pursuant to Section 5.3 of the Registrant's Declaration of Trust and under
Section 4.8 of the Registrant's By-laws, the indemnification of the Registrant's
trustees, officers, employees and agents is permitted if it is determined that
they acted under the belief that their actions were in or not opposed to the
best interest of the Registrant, and, with respect to any criminal proceeding,
they had reasonable cause to believe their conduct was not unlawful.  In
addition, indemnification is permitted only if it is determined that the actions
in question did not render them liable by reason of willful misfeasance, bad
faith or gross negligence in the performance of their duties or by reason of
reckless disregard of their obligations and duties to the Registrant.  Trustees,
officers, employees and agents will be indemnified for the expense of litigation
if it is determined that they are entitled to indemnification against any
liability established in such litigation.  The Registrant may also advance money
for these expenses provided that they give their undertakings to repay the
Registrant unless their conduct is later determined to permit indemnification.

     Pursuant to Section 5.2 of the Registrant's Declaration of Trust and
paragraph 8 of the Registrant's Investment Management Agreement, neither the
Investment Manager nor any trustee, officer, employee or agent of the Registrant
shall be liable for any action or failure to act, except in the case of bad
faith, willful misfeasance, gross negligence or reckless disregard of duties to
the Registrant.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 (the "Act") may be permitted to trustees, officers and controlling
persons of the Registrant pursuant to the foregoing provisions or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable.  In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a trustee, officer, or controlling person of the Registrant
in connection with the successful defense of any action, suit or proceeding) is
asserted against the Registrant by

<PAGE>


such trustee, officer or controlling person in connection with the shares being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act, and will be governed by the final adjudication
of such issue.

     The Registrant hereby undertakes that it will apply the indemnification
provision of its by-laws in a manner consistent with Release 11330 of the
Securities and Exchange Commission under the Investment Company Act of 1940, so
long as the interpretation of Sections 17(h) and 17(i) of such Act remains in
effect.

     Registrant, in conjunction with the Investment Manager, Registrant's
Trustees, and other registered investment management companies managed by the
Investment Manager, maintains insurance on behalf of any person who is or was a
Trustee, officer, employee, or agent of Registrant, or who is or was serving at
the request of Registrant as a trustee, director, officer, employee or agent of
another trust or corporation, against any liability asserted against him and
incurred by him or arising out of his position.  However, in no event will
Registrant maintain insurance to indemnify any such person for any act for which
Registrant  itself is not permitted to indemnify him.

Item 26.    BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISOR

     See "The Fund and Its Management" in the Prospectus regarding the business
of the investment advisor.  The following information is given regarding
officers of Morgan Stanley Dean Witter Advisors Inc. ("MSDW Advisors").  MSDW
Advisors is a wholly-owned subsidiary of Morgan Stanley Dean Witter & Co.  The
principal address of the Morgan Stanley Dean Witter Funds is Two World Trade
Center, New York, New York 10048.

     The term "Morgan Stanley Dean Witter Funds" refers to the following
registered investment companies:

CLOSED-END INVESTMENT COMPANIES
(1)    Morgan Stanley Dean Witter California Insured Municipal Income Trust
(2)    Morgan Stanley Dean Witter California Quality Municipal Securities
(3)    Morgan Stanley Dean Witter Government Income Trust
(4)    Morgan Stanley Dean Witter High Income Advantage Trust
(5)    Morgan Stanley Dean Witter High Income Advantage Trust II
(6)    Morgan Stanley Dean Witter High Income Advantage Trust III
(7)    Morgan Stanley Dean Witter Income Securities Inc.
(8)    Morgan Stanley Dean Witter Insured California Municipal Securities
(9)    Morgan Stanley Dean Witter Insured Municipal Bond Trust
(10)   Morgan Stanley Dean Witter Insured Municipal Income Trust
(11)   Morgan Stanley Dean Witter Insured Municipal Securities
(12)   Morgan Stanley Dean Witter Insured Municipal Trust
(13)   Morgan Stanley Dean Witter Municipal Income Opportunities Trust
(14)   Morgan Stanley Dean Witter Municipal Income Opportunities Trust II
(15)   Morgan Stanley Dean Witter Municipal Income Opportunities Trust III
(16)   Morgan Stanley Dean Witter Municipal Income Trust
(17)   Morgan Stanley Dean Witter Municipal Income Trust II
(18)   Morgan Stanley Dean Witter Municipal Income Trust III
(19)   Morgan Stanley Dean Witter Municipal Premium Income Trust


                                          2
<PAGE>

(20)   Morgan Stanley Dean Witter New York Quality Municipal Securities
(21)   Morgan Stanley Dean Witter Prime Income Trust
(22)   Morgan Stanley Dean Witter Quality Municipal Income Trust
(23)   Morgan Stanley Dean Witter Quality Municipal Investment Trust
(24)   Morgan Stanley Dean Witter Quality Municipal Securities

OPEN-END INVESTMENT COMPANIES
(1)    Active Assets California Tax-Free Trust
(2)    Active Assets Government Securities Trust
(3)    Active Assets Money Trust
(4)    Active Assets Tax-Free Trust
(5)    Morgan Stanley Dean Witter Aggressive Equity Fund
(6)    Morgan Stanley Dean Witter American Value Fund
(7)    Morgan Stanley Dean Witter Balanced Growth Fund
(8)    Morgan Stanley Dean Witter Balanced Income Fund
(9)    Morgan Stanley Dean Witter California Tax-Free Daily Income Trust
(10)   Morgan Stanley Dean Witter California Tax-Free Income Fund
(11)   Morgan Stanley Dean Witter Capital Appreciation Fund
(12)   Morgan Stanley Dean Witter Capital Growth Securities
(13)   Morgan Stanley Dean Witter Competitive Edge Fund, "BEST IDEAS PORTFOLIO"
(14)   Morgan Stanley Dean Witter Convertible Securities Trust
(15)   Morgan Stanley Dean Witter Developing Growth Securities Trust
(16)   Morgan Stanley Dean Witter Diversified Income Trust
(17)   Morgan Stanley Dean Witter Dividend Growth Securities Inc.
(18)   Morgan Stanley Dean Witter Equity Fund
(19)   Morgan Stanley Dean Witter European Growth Fund Inc.
(20)   Morgan Stanley Dean Witter Federal Securities Trust
(21)   Morgan Stanley Dean Witter Financial Services Trust
(22)   Morgan Stanley Dean Witter Fund of Funds
(23)   Morgan Stanley Dean Witter Global Dividend Growth Securities
(24)   Morgan Stanley Dean Witter Global Short-Term Income Fund Inc.
(25)   Morgan Stanley Dean Witter Global Utilities Fund
(26)   Morgan Stanley Dean Witter Growth Fund
(27)   Morgan Stanley Dean Witter Hawaii Municipal Trust
(28)   Morgan Stanley Dean Witter Health Sciences Trust
(29)   Morgan Stanley Dean Witter High Yield Securities Inc.
(30)   Morgan Stanley Dean Witter Income Builder Fund
(31)   Morgan Stanley Dean Witter Information Fund
(32)   Morgan Stanley Dean Witter Intermediate Income Securities
(33)   Morgan Stanley Dean Witter International SmallCap Fund
(34)   Morgan Stanley Dean Witter Japan Fund
(35)   Morgan Stanley Dean Witter Limited Term Municipal Trust
(36)   Morgan Stanley Dean Witter Liquid Asset Fund Inc.
(37)   Morgan Stanley Dean Witter Market Leader Trust
(38)   Morgan Stanley Dean Witter Mid-Cap Dividend Growth Securities
(39)   Morgan Stanley Dean Witter Mid-Cap Growth Fund
(40)   Morgan Stanley Dean Witter Multi-State Municipal Series Trust
(41)   Morgan Stanley Dean Witter Natural Resource Development Securities Inc.
(42)   Morgan Stanley Dean Witter New York Municipal Money Market Trust
(43)   Morgan Stanley Dean Witter New York Tax-Free Income Fund
(44)   Morgan Stanley Dean Witter Pacific Growth Fund Inc.


                                          3
<PAGE>

(45)   Morgan Stanley Dean Witter Precious Metals and Minerals Trust
(46)   Morgan Stanley Dean Witter S&P 500 Index Fund
(47)   Morgan Stanley Dean Witter S&P 500 Select Fund
(48)   Morgan Stanley Dean Witter Select Dimensions Investment Series
(49)   Morgan Stanley Dean Witter Select Municipal Reinvestment Fund
(50)   Morgan Stanley Dean Witter Short-Term Bond Fund
(51)   Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust
(52)   Morgan Stanley Dean Witter Special Value Fund
(53)   Morgan Stanley Dean Witter Strategist Fund
(54)   Morgan Stanley Dean Witter Tax-Exempt Securities Trust
(55)   Morgan Stanley Dean Witter Tax-Free Daily Income Trust
(56)   Morgan Stanley Dean Witter U.S. Government Money Market Trust
(57)   Morgan Stanley Dean Witter U.S. Government Securities Trust
(58)   Morgan Stanley Dean Witter Utilities Fund
(59)   Morgan Stanley Dean Witter Value-Added Market Series
(60)   Morgan Stanley Dean Witter Value Fund
(61)   Morgan Stanley Dean Witter Variable Investment Series
(62)   Morgan Stanley Dean Witter World Wide Income Trust

       The term "TCW/DW Funds" refers to the following registered investment
companies:

OPEN-END INVESTMENT COMPANIES
(1)    TCW/DW Emerging Markets Opportunities Trust
(2)    TCW/DW Global Telecom Trust
(3)    TCW/DW Income and Growth Fund
(4)    TCW/DW Latin American Growth Fund
(5)    TCW/DW Mid-Cap Equity Trust
(6)    TCW/DW North American Government Income Trust
(7)    TCW/DW Small Cap Growth Fund
(8)    TCW/DW Total Return Trust

CLOSED-END INVESTMENT COMPANIES
(1)    TCW/DW Term Trust 2000
(2)    TCW/DW Term Trust 2002
(3)    TCW/DW Term Trust 2003


                                        4
<PAGE>

<TABLE>
<CAPTION>
NAME AND POSITION WITH        OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
MORGAN STANLEY DEAN           OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
WITTER ADVISORS INC.          AND NATURE OF CONNECTION
- ----------------------        ---------------------------------------------------------
<S>                           <C>
Mitchell M. Merin             President and Chief Operating Officer of Asset
President, Chief              Management of Morgan Stanley Dean Witter & Co.
Executive Officer and         ("MSDW); Chairman and Director of Morgan Stanley Dean
Director                      Witter Distributors Inc. ("MSDW Distributors") and Morgan
                              Stanley Dean Witter Trust FSB ("MSDW Trust"); President,
                              Chief Executive Officer and Director of Morgan Stanley
                              Dean Witter Services Company Inc. ("MSDW Services");
                              Vice President of the Morgan Stanley Dean 
                              Witter Funds, TCW/DW Funds and Discover Brokerage Index 
                              Series; Executive Vice President and Director of Dean 
                              Witter Reynolds Inc. ("DWR"); Director of various MSDW
                              subsidiaries.

Thomas C. Schneider           Executive Vice President and Chief Strategic and
Executive Vice                Administrative Officer of MSDW; Executive Vice
President and Chief           President and Chief Financial Officer of MSDW Services;
Financial Officer             Director of DWR and MSDW.

Joseph J. McAlinden           Vice President of the Morgan Stanley Dean Witter Funds
Executive Vice President      and Discover Brokerage Index Series; Director of MSDW 
and Chief Investment          Trust.
Officer

Ronald E. Robison             Executive Vice President, Chief Administrative Officer
Executive Vice President      and Director of MSDW Services; Vice President of the 
and Chief Administrative      Morgan Stanley Dean Witter Funds TCW/DW Funds, and
Officer and Director          Discover Brokerage Index Series.

Edward C. Oelsner, III
Executive Vice President

Barry Fink                    Assistant Secretary of DWR; Senior Vice President,
Senior Vice President,        Secretary, General Counsel and Director of MSDW
Secretary, General            Services; Senior Vice President, Assistant Secretary and
Counsel and Director          Assistant General Counsel of MSDW Distributors; Vice
                              President, Secretary and General Counsel of the Morgan
                              Stanley Dean Witter Funds and the TCW/DW Funds.

Peter M. Avelar               Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Mark Bavoso                   Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.


                                        5
<PAGE>

<CAPTION>

NAME AND POSITION WITH        OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
MORGAN STANLEY DEAN           OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
WITTER ADVISORS INC.          AND NATURE OF CONNECTION
- ----------------------        ---------------------------------------------------------
<S>                           <C>

Rosalie Clough
Senior Vice President
and Director of Marketing

Richard Felegy
Senior Vice President

Edward F. Gaylor              Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Robert S. Giambrone           Senior Vice President of MSDW Services, MSDW
Senior Vice President         Distributors and MSDW Trust and Director of MSDW Trust;
                              Vice President of the Morgan Stanley Dean Witter Funds,
                              TCW/DW Funds and Discover Brokerage Index Series.

Rajesh K. Gupta               Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Kenton J. Hinchliffe          Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds and Discover Brokerage Index Series.

Kevin Hurley                  Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Margaret Iannuzzi
Senior Vice President

Jenny Beth Jones              Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

John B. Kemp, III             President of MSDW Distributors.
Senior Vice President

Anita H. Kolleeny             Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Jonathan R. Page              Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Ira N. Ross                   Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Guy G. Rutherfurd, Jr.        Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Rochelle G. Siegel            Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.




                                        6
<PAGE>

<CAPTION>

NAME AND POSITION WITH        OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
MORGAN STANLEY DEAN           OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
WITTER ADVISORS INC.          AND NATURE OF CONNECTION
- ----------------------        ---------------------------------------------------------
<S>                           <C>
James Solloway
Senior Vice President

Jayne M. Stevlingson          Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Paul D. Vance                 Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.


Elizabeth A. Vetell
Senior Vice President
and Director of Shareholder
Communication

James F. Willison             Vice President of various Morgan Stanley Dean Witter
Senior Vice President         Funds.

Douglas Brown
First Vice President

Frank Bruttomesso             First Vice President and Assistant Secretary of MSDW
First Vice President and      Services; Assistant Secretary of the Morgan Stanley Dean
Assistant Secretary           Witter Funds, TCW/DW Funds and Discover Brokerage Index
                              Series.

Thomas F. Caloia              First Vice President and Assistant Treasurer of
First Vice President          MSDW Services; Assistant Treasurer of MSDW
and Assistant                 Distributors; Treasurer and Chief Financial Officer of the
Treasurer                     Morgan Stanley Dean Witter Funds, TCW/DW Funds and Discover 
                              Brokerage Index Series.

Thomas Chronert
First Vice President

Marilyn K. Cranney            Assistant Secretary of DWR; First Vice President and
First Vice President          Assistant Secretary of MSDW Services; Assistant
and Assistant Secretary       Secretary of the Morgan Stanley Dean Witter Funds, 
                              TCW/DW Funds and Discover Brokerage Index Series.

Salvatore DeSteno             Vice President of MSDW Services.
First Vice President

Michael Interrante            First Vice President and Controller of MSDW Services;
First Vice President          Assistant Treasurer of MSDW Distributors; First Vice
and Controller                President and Treasurer of MSDW Trust.


                                        7
<PAGE>

<CAPTION>

NAME AND POSITION WITH        OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
MORGAN STANLEY DEAN           OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
WITTER ADVISORS INC.          AND NATURE OF CONNECTION
- ----------------------        ---------------------------------------------------------
<S>                           <C>
David Johnson
First Vice President

Stanley Kapica
First Vice President

LouAnne D. McInnis            First Vice President and Assistant Secretary of MSDW
First Vice President and      Services; Assistant Secretary of the Morgan Stanley Dean
Assistant Secretary           Witter Funds, TCW/DW Funds and Discover Brokerage
                              Index Series.

Carsten Otto                  First Vice President and Assistant Secretary of MSDW
First Vice President          Services; Assistant Secretary of the Morgan Stanley
and Assistant Secretary       Dean Witter Funds, TCW/DW Funds and Discover Brokerage
                              Index Series.

Ruth Rossi                    First Vice President and Assistant Secretary of MSDW 
First Vice President and      Services; Assistant Secretary of the Morgan Stanley Dean
Assistant Secretary           Witter Funds, TCW/DW Funds and Discover Brokerage Index
                              Series.

James P. Wallin
First Vice President

Robert Zimmerman
First Vice President

Dale Albright
Vice President

Joan G. Allman
Vice President

Andrew Arbenz
Vice President

Joseph Arcieri                Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

Nancy Belza
Vice President

Maurice Bendrihem
Vice President and
Assistant Controller


                                        8
<PAGE>

<CAPTION>

NAME AND POSITION WITH        OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
MORGAN STANLEY DEAN           OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
WITTER ADVISORS INC.          AND NATURE OF CONNECTION
- ----------------------        ---------------------------------------------------------
<S>                           <C>

Dale Boetcher
Vice President

Ronald Caldwell
Vice President

Joseph Cardwell
Vice President

Philip Casparius
Vice President

David Dineen
Vice President

Michael Durbin
Vice President

Sheila Finnerty                Vice President of Morgan Stanley Dean Witter
Vice President                 Prime Income Trust.

Jeffrey D. Geffen
Vice President

Sandra Gelpieryn
Vice President

Michael Geringer
Vice President

Ellen Gold
Vice President

Stephen Greenhut
Vice President

Peter W. Gurman
Vice President

Matthew Haynes                Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

Peter Hermann                 Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

David Hoffman
Vice President



                                        9
<PAGE>

<CAPTION>

NAME AND POSITION WITH        OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
MORGAN STANLEY DEAN           OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
WITTER ADVISORS INC.          AND NATURE OF CONNECTION
- ----------------------        --------------------------------------------------------
<S>                           <C>

Christopher Jones
Vice President

Kevin Jung
Vice President

Carol Espejo Kane
Vice President

Michelle Kaufman              Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

Paula LaCosta                 Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

Thomas Lawlor
Vice President

Todd Lebo                     Vice President and Assistant Secretary of MSDW 
Vice President                Services; Assistant Secretary of the Morgan Stanley
                              Dean Witter Funds, TCW/DW Funds and Discover Brokerage
                              Index Series.

Gerard J. Lian                Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

Nancy Login
Vice President

Steven MacNamara
Vice President

Catherine Maniscalco          Vice President of Morgan Stanley Dean Witter Natural
Vice President                Resource Development Securities Inc.

Albert McGarity
Vice President

Teresa McRoberts              Vice President of Morgan Stanley Dean Witter S&P 500
Vice President                Select Fund

Mark Mitchell
Vice President

Julie Morrone
Vice President


                                       10
<PAGE>

<CAPTION>

NAME AND POSITION WITH        OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
MORGAN STANLEY DEAN           OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
WITTER ADVISORS INC.          AND NATURE OF CONNECTION
- ----------------------        ---------------------------------------------------------
<S>                           <C>
Mary Beth Mueller
Vice President

David Myers                   Vice President of Morgan Stanley Dean Witter Natural
Vice President                Resource Development Securities Inc.

Richard Norris
Vice President

George Paoletti               Vice President of Morgan Stanley Dean Witter Information
Vice President                Fund.

Anne Pickrell                 Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

John Roscoe
Vice President

Hugh Rose
Vice President

Robert Rossetti               Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

Carl F. Sadler
Vice President

Deborah Santaniello
Vice President

Howard A. Schloss             Vice President of Morgan Stanley Dean Witter Federal
Vice President                Securities Trust.

Peter J. Seeley               Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

Robert Stearns
Vice President

Naomi Stein
Vice President

Michael Strayhorn
Vice President

Kathleen H. Stromberg         Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.


                                       11
<PAGE>

<CAPTION>

NAME AND POSITION WITH        OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
MORGAN STANLEY DEAN           OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
WITTER ADVISORS INC.          AND NATURE OF CONNECTION
- ----------------------        ---------------------------------------------------------
<S>                           <C>
Marybeth Swisher
Vice President

Robert Vanden Assem
Vice President

Alice Weiss                   Vice President of various Morgan Stanley Dean Witter
Vice President                Funds.

John Wong
Vice President
</TABLE>


Item 27.    PRINCIPAL UNDERWRITERS

(a)  Morgan Stanley Dean Witter Distributors Inc. ("MSDW Distributors"), a
     Delaware corporation, is the principal underwriter of the Registrant. MSDW
     Distributors is also the principal underwriter of the following investment
     companies:

(1)    Active Assets California Tax-Free Trust
(2)    Active Assets Government Securities Trust
(3)    Active Assets Money Trust
(4)    Active Assets Tax-Free Trust
(5)    Morgan Stanley Dean Witter Aggressive Equity Fund
(6)    Morgan Stanley Dean Witter American Value Fund
(7)    Morgan Stanley Dean Witter Balanced Growth Fund
(8)    Morgan Stanley Dean Witter Balanced Income Fund
(9)    Morgan Stanley Dean Witter California Tax-Free Daily Income Trust
(10)   Morgan Stanley Dean Witter California Tax-Free Income Fund
(11)   Morgan Stanley Dean Witter Capital Appreciation Fund
(12)   Morgan Stanley Dean Witter Capital Growth Securities
(13)   Morgan Stanley Dean Witter Competitive Edge Fund, "BEST IDEAS PORTFOLIO"
(14)   Morgan Stanley Dean Witter Convertible Securities Trust
(15)   Morgan Stanley Dean Witter Developing Growth Securities Trust
(16)   Morgan Stanley Dean Witter Diversified Income Trust
(17)   Morgan Stanley Dean Witter Dividend Growth Securities Inc.
(18)   Morgan Stanley Dean Witter Equity Fund
(19)   Morgan Stanley Dean Witter European Growth Fund Inc.
(20)   Morgan Stanley Dean Witter Federal Securities Trust
(21)   Morgan Stanley Dean Witter Financial Services Trust
(22)   Morgan Stanley Dean Witter Fund of Funds
(23)   Morgan Stanley Dean Witter Global Dividend Growth Securities
(24)   Morgan Stanley Dean Witter Global Short-Term Income Fund Inc.
(25)   Morgan Stanley Dean Witter Global Utilities Fund
(26)   Morgan Stanley Dean Witter Growth Fund
(27)   Morgan Stanley Dean Witter Hawaii Municipal Trust
(28)   Morgan Stanley Dean Witter Health Sciences Trust
(29)   Morgan Stanley Dean Witter High Yield Securities Inc.


                                          12
<PAGE>

(30)   Morgan Stanley Dean Witter Income Builder Fund
(31)   Morgan Stanley Dean Witter Information Fund
(32)   Morgan Stanley Dean Witter Intermediate Income Securities
(33)   Morgan Stanley Dean Witter International SmallCap Fund
(34)   Morgan Stanley Dean Witter Japan Fund
(35)   Morgan Stanley Dean Witter Limited Term Municipal Trust
(36)   Morgan Stanley Dean Witter Liquid Asset Fund Inc.
(37)   Morgan Stanley Dean Witter Market Leader Trust
(38)   Morgan Stanley Dean Witter Mid-Cap Dividend Growth Securities
(39)   Morgan Stanley Dean Witter Mid-Cap Growth Fund
(40)   Morgan Stanley Dean Witter Multi-State Municipal Series Trust
(41)   Morgan Stanley Dean Witter Natural Resource Development Securities Inc.
(42)   Morgan Stanley Dean Witter New York Municipal Money Market Trust
(43)   Morgan Stanley Dean Witter New York Tax-Free Income Fund
(44)   Morgan Stanley Dean Witter Pacific Growth Fund Inc.
(45)   Morgan Stanley Dean Witter Precious Metals and Minerals Trust
(46)   Morgan Stanley Dean Witter Prime Income Trust
(47)   Morgan Stanley Dean Witter S&P 500 Index Fund
(48)   Morgan Stanley Dean Witter S&P 500 Select Fund
(49)   Morgan Stanley Dean Witter Short-Term Bond Fund
(50)   Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust
(51)   Morgan Stanley Dean Witter Special Value Fund
(52)   Morgan Stanley Dean Witter Strategist Fund
(53)   Morgan Stanley Dean Witter Tax-Exempt Securities Trust
(54)   Morgan Stanley Dean Witter Tax-Free Daily Income Trust
(55)   Morgan Stanley Dean Witter U.S. Government Money Market Trust
(56)   Morgan Stanley Dean Witter U.S. Government Securities Trust
(57)   Morgan Stanley Dean Witter Utilities Fund
(58)   Morgan Stanley Dean Witter Value-Added Market Series
(59)   Morgan Stanley Dean Witter Value Fund
(60)   Morgan Stanley Dean Witter Variable Investment Series
(61)   Morgan Stanley Dean Witter World Wide Income Trust
(1)    TCW/DW Emerging Markets Opportunities Trust
(2)    TCW/DW Global Telecom Trust
(3)    TCW/DW Income and Growth
(4)    TCW/DW Latin American Growth Fund
(5)    TCW/DW Mid-Cap Equity Trust
(6)    TCW/DW North American Government Income Trust
(7)    TCW/DW Small Cap Growth Fund
(8)    TCW/DW Total Return Trust

(b)  The following information is given regarding directors and officers of MSDW
     Distributors not listed in Item 26 above.  The principal address of MSDW
     Distributors is Two World Trade Center, New York, New York 10048.  Other
     than Mr. Purcell, who is a Trustee of the Registrant, none of the following
     persons has any position or office with the Registrant.


                                          13
<PAGE>

Name                          Positions and Office with MSDW Distributors
- ----                          -------------------------------------------

Christine Edwards             Executive Vice President, Secretary, Director and
                              Chief Legal Officer.

Michael T. Gregg              Vice President and Assistant Secretary.

James F. Higgins              Director

Fredrick K. Kubler            Senior Vice President, Assistant Secretary and
                              Chief Compliance Officer.

Philip J. Purcell             Director

John Schaeffer                Director

Charles Vidala                Senior Vice President and Financial Principal

Item 28.    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 and the Rules thereunder are
maintained by the Investment Manager at its offices, except records relating to
holders of shares issued by the Registrant, which are maintained by the
Registrant's Transfer Agent, at its place of business as shown in the
prospectus.

Item 29.    MANAGEMENT SERVICES

     Registrant is not a party to any such management-related service contract.

Item 30.    UNDERTAKINGS

     None.


                                          14

<PAGE>

                                      SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Registration Statement pursuant to
Rule 485(b) under the Securities Act of 1933 and has duly caused this
Post-Effective Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of New York
and State of New York on the 24th day of February, 1999.

                         MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST

                                        By    /s/ Barry Fink
                                           ----------------------------
                                                  Barry Fink
                                           Vice President and Secretary

     Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment No. 15 has been signed below by the following persons
in the capacities and on the dates indicated.

       Signatures                       Title                    Date
       ----------                       -----                    ----

(1) Principal Executive Officer         President, Chief
                                        Executive Officer,
                                        Trustee and Chairman
By  /s/ Charles A. Fiumefreddo                                   02/24/99
    --------------------------
        Charles A. Fiumefreddo

(2) Principal Financial Officer         Treasurer and Principal
                                        Accounting Officer

By  /s/ Thomas F. Caloia                                         02/24/99
    --------------------------
        Thomas F. Caloia

(3) Majority of the Trustees

    Charles A. Fiumefreddo (Chairman)
    Philip J. Purcell

By  /s/ Barry Fink                                               02/24/99
    --------------------------
        Barry Fink
        Attorney-in-Fact

     Michael Bozic       Manuel H. Johnson
     Edwin J. Garn       Michael E. Nugent
     John R. Haire       John L. Schroeder
     Wayne E. Hedien




By  /s/ David M. Butowsky                                        02/24/99
    --------------------------
        David M. Butowsky
        Attorney-in-Fact

<PAGE>

                 MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST

                                    EXHIBIT INDEX


<TABLE>
<CAPTION>
               Exhibit No.              Description
               -----------              -----------
               <S>            <C>
               2.   --        Form of Amended and Restated By-Laws of the
                              Registrant dated

               10.  --        Consent of Independent Accountants

               14.  --        Financial Data Schedules
</TABLE>


<PAGE>

                                                                                
                                    BY-LAWS


                                       OF


              MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST


                  AMENDED AND RESTATED AS OF JANUARY 28, 1999


                                   ARTICLE I

                                  DEFINITIONS

     The terms "Commission," "Declaration," "Distributor," "Investment
Adviser," "Majority Shareholder Vote," "1940 Act," "Shareholder," "Shares,"
"Transfer Agent," "Trust," "Trust Property," and "Trustees" have the respective
meanings given them in the Declaration of Trust of Morgan Stanley Dean Witter
Federal Securities Trust dated November 20, 1986, as amended from time to time.
 


                                   ARTICLE II

                                    OFFICES

     SECTION 2.1. Principal Office. Until changed by the Trustees, the
principal office of the Trust in the Commonwealth of Massachusetts shall be in
the City of Boston, County of Suffolk.

     SECTION 2.2. Other Offices. In addition to its principal office in the
Commonwealth of Massachusetts, the Trust may have an office or offices in the
City of New York, State of New York, and at such other places within and
without the Commonwealth as the Trustees may from time to time designate or the
business of the Trust may require.


                                  ARTICLE III

                            SHAREHOLDERS' MEETINGS

     SECTION 3.1. Place of Meetings. Meetings of Shareholders shall be held at
such place, within or without the Commonwealth of Massachusetts, as may be
designated from time to time by the Trustees.

     SECTION 3.2. Meetings. Meetings of Shareholders of the Trust shall be held
whenever called by the Trustees or the President of the Trust and whenever
election of a Trustee or Trustees by Shareholders is required by the provisions
of Section 16(a) of the 1940 Act, for that purpose. Meetings of Shareholders
shall also be called by the Secretary upon the written request of the holders
of Shares entitled to vote not less than twenty-five percent (25%) of all the
votes entitled to be cast at such meeting. Such request shall state the purpose
or purposes of such meeting and the matters proposed to be acted on thereat.
The Secretary shall inform such Shareholders of the reasonable estimated cost
of preparing and mailing such notice of the meeting, and upon payment to the
Trust of such costs, the Secretary shall give notice stating the purpose or
purposes of the meeting to all entitled to vote at such meeting. No meeting
need be called upon the request of the holders of Shares entitled to cast less
than a majority of all votes entitled to be cast at such meeting, to consider
any matter which is substantially the same as a matter voted upon at any
meeting of Shareholders held during the preceding twelve months.

     SECTION 3.3. Notice of Meetings. Written or printed notice of every
Shareholders' meeting stating the place, date, and purpose or purposes thereof,
shall be given by the Secretary not less than ten (10) nor more than ninety
(90) days before such meeting to each Shareholder entitled to vote at such
meeting. Such notice shall be deemed to be given when deposited in the United
States mail, postage prepaid, directed to the Shareholder at his address as it
appears on the records of the Trust.


C66954 FEDERALSEC
<PAGE>

     SECTION 3.4 Quorum and Adjournment of Meetings. Except as otherwise
provided by law, by the Declaration or by these By-Laws, at all meetings of
Shareholders, the holders of a majority of the Shares issued and outstanding
and entitled to vote thereat, present in person or represented by proxy, shall
be requisite and shall constitute a quorum for the transaction of business. In
the absence of a quorum, the Shareholders present or represented by proxy and
entitled to vote thereat shall have the power to adjourn the meeting from time
to time. The Shareholders present in person or represented by proxy at any
meeting and entitled to vote thereat also shall have the power to adjourn the
meeting from time to time if the vote required to approve or reject any
proposal described in the original notice of such meeting is not obtained (with
proxies being voted for or against adjournment consistent with the votes for
and against the proposal for which the required vote has not been obtained).
The affirmative vote of the holders of a majority of the Shares then present in
person or represented by proxy shall be required to adjourn any meeting. Any
adjourned meeting may be reconvened without further notice or change in record
date. At any reconvened meeting at which a quorum shall be present, any
business may be transacted that might have been transacted at the meeting as
originally called.


     SECTION 3.5. Voting Rights, Proxies.  At each meeting of Shareholders,
each holder of record of Shares entitled to vote thereat shall be entitled to
one vote in person or by proxy for each Share of beneficial interest of the
Trust and for the fractional portion of one vote for each fractional Share
entitled to vote so registered in his or her name on the records of the Trust
on the date fixed as the record date for the determination of Shareholders
entitled to vote at such meeting. Without limiting the manner in which a
Shareholder may authorize another person or persons to act for such Shareholder
as proxy pursuant hereto, the following shall constitute a valid means by which
a Shareholder may grant such authority:

   (i) A Shareholder may execute a writing authorizing another person or
   persons to act for such Shareholder as proxy. Execution may be accomplished
   by the Shareholder or such Shareholder's authorized officer, director,
   employee, attorney-in-fact or another agent signing such writing or causing
   such person's signature to be affixed to such writing by any reasonable
   means including, but not limited to, by facsimile or telecopy signature. No
   written evidence of authority of a Shareholder's authorized officer,
   director, employee, attorney-in-fact or other agent shall be required; and

   (ii) A Shareholder may authorize another person or persons to act for such
   Shareholder as proxy by transmitting or authorizing the transmission of a
   telegram or cablegram or by other means of telephonic, electronic or
   computer transmission to the person who will be the holder of the proxy or
   to a proxy solicitation firm, proxy support service organization or like
   agent duly authorized by the person who will be the holder of the proxy to
   receive such transmission, provided that any such telegram or cablegram or
   other means of telephonic, electronic or computer transmission must either
   set forth or be submitted with information from which it can be determined
   that the telegram, cablegram or other transmission was authorized by the
   Shareholder.

No proxy shall be valid after eleven months from its date, unless otherwise
provided in the proxy. At all meetings of Shareholders, unless the voting is
conducted by inspectors, all questions relating to the qualification of voters
and the validity of proxies and the acceptance or rejection of votes shall be
decided by the chairman of the meeting. In determining whether a telegram,
cablegram or other electronic transmission is valid, the chairman or inspector,
as the case may be, shall specify the information upon which he or she relied.
Pursuant to a resolution of a majority of the Trustees, proxies may be
solicited in the name of one or more Trustees or Officers of the Trust. Proxy
solicitations may be made in writing or by using telephonic or other electronic
solicitation procedures that include appropriate methods of verifying the
identity of the Shareholder and confirming any instructions given thereby.

     SECTION 3.6. Vote Required. Except as otherwise provided by law, by the
Declaration of Trust, or by these By-Laws, at each meeting of Shareholders at
which a quorum is present, all matters shall be decided by Majority Shareholder
Vote.

     SECTION 3.7. Inspectors of Election. In advance of any meeting of
Shareholders, the Trustees may appoint Inspectors of Election to act at the
meeting or any adjournment thereof. If Inspectors of Election are not so
appointed, the chairman of any meeting of Shareholders may, and on the request
of any


                                       2
<PAGE>

Shareholder or his proxy shall, appoint Inspectors of Election of the meeting.
In case any person appointed as Inspector fails to appear or fails or refuses
to act, the vacancy may be filled by appointment made by the Trustees in
advance of the convening of the meeting or at the meeting by the person acting
as chairman. The Inspectors of Election shall determine the number of Shares
outstanding, the Shares represented at the meeting, the existence of a quorum,
the authenticity, validity and effect of proxies, shall receive votes, ballots
or consents, shall hear and determine all challenges and questions in any way
arising in connection with the right to vote, shall count and tabulate all
votes or consents, determine the results, and do such other acts as may be
proper to conduct the election or vote with fairness to all Shareholders. On
request of the chairman of the meeting, or of any Shareholder or his proxy, the
Inspectors of Election shall make a report in writing of any challenge or
question or matter determined by them and shall execute a certificate of any
facts found by them.

     SECTION 3.8. Inspection of Books and Records. Shareholders shall have such
rights and procedures of inspection of the books and records of the Trust as
are granted to Shareholders under Section 32 of the Business Corporation Law of
the Commonwealth of Massachusetts.

     SECTION 3.9. Action by Shareholders Without Meeting. Except as otherwise
provided by law, the provisions of these By-Laws relating to notices and
meetings to the contrary notwithstanding, any action required or permitted to
be taken at any meeting of Shareholders may be taken without a meeting if a
majority of the Shareholders entitled to vote upon the action consent to the
action in writing and such consents are filed with the records of the Trust.
Such consent shall be treated for all purposes as a vote taken at a meeting of
Shareholders.

     SECTION 3.10. Presence at Meetings. Presence at meetings of shareholders
requires physical attendance by the shareholder or his or her proxy at the
meeting site and does not encompass attendance by telephonic or other
electronic means.


                                   ARTICLE IV

                                   TRUSTEES

     SECTION 4.1. Meetings of the Trustees. The Trustees may in their
discretion provide for regular or special meetings of the Trustees. Regular
meetings of the Trustees may be held at such time and place as shall be
determined from time to time by the Trustees without further notice. Special
meetings of the Trustees may be called at any time by the President and shall
be called by the President or the Secretary upon the written request of any two
(2) Trustees.

     SECTION 4.2. Notice of Special Meetings. Written notice of special
meetings of the Trustees, stating the place, date and time thereof, shall be
given not less than two (2) days before such meeting to each Trustee,
personally, by telegram, by mail, or by leaving such notice at his place of
residence or usual place of business. If mailed, such notice shall be deemed to
be given when deposited in the United States mail, postage prepaid, directed to
the Trustee at his address as it appears on the records of the Trust. Subject
to the provisions of the 1940 Act, notice or waiver of notice need not specify
the purpose of any special meeting.

     SECTION 4.3. Telephone Meetings. Subject to the provisions of the 1940
Act, any Trustee, or any member or members of any committee designated by the
Trustees, may participate in a meeting of the Trustees, or any such committee,
as the case may be, by means of a conference telephone or similar
communications equipment if all persons participating in the meeting can hear
each other at the same time. Participation in a meeting by these means
constitutes presence in person at the meeting.

     SECTION 4.4. Quorum, Voting and Adjournment of Meetings. At all meetings
of the Trustees, a majority of the Trustees shall be requisite to and shall
constitute a quorum for the transaction of business. If a quorum is present,
the affirmative vote of a majority of the Trustees present shall be the act of
the Trustees, unless the concurrence of a greater proportion is expressly
required for such action by law, the Declaration or these By-Laws. If at any
meeting of the Trustees there be less than a quorum present, the Trustees
present thereat may adjourn the meeting from time to time, without notice other
than announcement at the meeting, until a quorum shall have been obtained.


                                       3
<PAGE>

     SECTION 4.5. Action by Trustees Without Meeting. The provisions of these
By-Laws covering notices and meetings to the contrary notwithstanding, and
except as required by law, any action required or permitted to be taken at any
meeting of the Trustees may be taken without a meeting if a consent in writing
setting forth the action shall be signed by all of the Trustees entitled to
vote upon the action and such written consent is filed with the minutes of
proceedings of the Trustees.

     SECTION 4.6. Expenses and Fees. Each Trustee may be allowed expenses, if
any, for attendance at each regular or special meeting of the Trustees, and
each Trustee who is not an officer or employee of the Trust or of its
investment manager or underwriter or of any corporate affiliate of any of said
persons shall receive for services rendered as a Trustee of the Trust such
compensation as may be fixed by the Trustees. Nothing herein contained shall be
construed to preclude any Trustee from serving the Trust in any other capacity
and receiving compensation therefor.

     SECTION 4.7.  Execution of Instruments and Documents and Signing of Checks
and Other Obligations and Transfers. All instruments, documents and other
papers shall be executed in the name and on behalf of the Trust and all checks,
notes, drafts and other obligations for the payment of money by the Trust shall
be signed, and all transfer of securities standing in the name of the Trust
shall be executed, by the Chairman, the President, any Vice President or the
Treasurer or by any one or more officers or agents of the Trust as shall be
designated for that purpose by vote of the Trustees; notwithstanding the above,
nothing in this Section 4.7 shall be deemed to preclude the electronic
authorization, by designated persons, of the Trust's Custodian (as described
herein in Section 9.1) to transfer assets of the Trust, as provided for herein
in Section 9.1.

     SECTION 4.8. Indemnification of Trustees, Officers, Employees and
Agents. (a) The Trust shall indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending, or completed action,
suit or proceeding, whether civil, criminal, administrative or investigative
(other than an action by or in the right of the Trust) by reason of the fact
that he is or was a Trustee, officer, employee, or agent of the Trust. The
indemnification shall be against expenses, including attorneys' fees,
judgments, fines, and amounts paid in settlement, actually and reasonably
incurred by him in connection with the action, suit, or proceeding, if he acted
in good faith and in a manner he reasonably believed to be in or not opposed to
the best interests of the Trust, and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his conduct was unlawful. The
termination of any action, suit or proceeding by judgment, order, settlement,
conviction, or upon a plea of nolo contendere or its equivalent, shall not, of
itself, create a presumption that the person did not act in good faith and in a
manner which he reasonably believed to be in or not opposed to the best
interests of the Trust, and, with respect to any criminal action or proceeding,
had reasonable cause to believe that his conduct was unlawful.

     (b) The Trust shall indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action or
suit by or on behalf of the Trust to obtain a judgment or decree in its favor
by reason of the fact that he is or was a Trustee, officer, employee, or agent
of the Trust. The indemnification shall be against expenses, including
attorneys' fees actually and reasonably incurred by him in connection with the
defense or settlement of the action or suit, if he acted in good faith and in a
manner he reasonably believed to be in or not opposed to the best interests of
the Trust; except that no indemnification shall be made in respect of any
claim, issue, or matter as to which the person has been adjudged to be liable
for negligence or misconduct in the performance of his duty to the Trust,
except to the extent that the court in which the action or suit was brought, or
a court of equity in the county in which the Trust has its principal office,
determines upon application that, despite the adjudication of liability but in
view of all circumstances of the case, the person is fairly and reasonably
entitled to indemnity for those expenses which the court shall deem proper,
provided such Trustee, officer, employee or agent is not adjudged to be liable
by reason of his willful misfeasance, bad faith, gross negligence or reckless
disregard of the duties involved in the conduct of his office.

     (c) To the extent that a Trustee, officer, employee, or agent of the Trust
has been successful on the merits or otherwise in defense of any action, suit
or proceeding referred to in subsection (a) or (b) or in defense of any claim,
issue or matter therein, he shall be indemnified against expenses, including
attorneys' fees, actually and reasonably incurred by him in connection
therewith.


                                       4
<PAGE>

     (d) (1) Unless a court orders otherwise, any indemnification under
subsections (a) or (b) of this section may be made by the Trust only as
authorized in the specific case after a determination that indemnification of
the Trustee, officer, employee, or agent is proper in the circumstances because
he has met the applicable standard of conduct set forth in subsections (a) or
(b).

        (2) The determination shall be made:

           (i) By the Trustees, by a majority vote of a quorum which consists 
    of Trustees who were not parties to the action, suit or proceeding; or

          (ii) If the required quorum is not obtainable, or if a quorum of
    disinterested Trustees so directs, by independent legal counsel in a
    written opinion; or

         (iii) By the Shareholders.

        (3) Notwithstanding any provision of this Section 4.8, no person shall
    be entitled to indemnification for any liability, whether or not there is
    an adjudication of liability, arising by reason of willful misfeasance,
    bad faith, gross negligence, or reckless disregard of duties as described
    in Section 17(h) and (i) of the Investment Company Act of 1940 ("disabling
    conduct"). A person shall be deemed not liable by reason of disabling
    conduct if, either:

           (i) a final decision on the merits is made by a court or other body
    before whom the proceeding was brought that the person to be indemnified
    ("indemnitee") was not liable by reason of disabling conduct; or

          (ii) in the absence of such a decision, a reasonable determination,
    based upon a review of the facts, that the indemnitee was not liable by
    reason of disabling conduct, is made by either--

               (A) a majority of a quorum of Trustees who are neither
        "interested persons" of the Trust, as defined in Section 2(a)(19) of
        the Investment Company Act of 1940, nor parties to the action, suit
        or proceeding, or

               (B) an independent legal counsel in a written opinion.

     (e) Expenses, including attorneys' fees, incurred by a Trustee, officer,
employee or agent of the Trust in defending a civil or criminal action, suit or
proceeding may be paid by the Trust in advance of the final disposition thereof
if:

        (1) authorized in the specific case by the Trustees; and

        (2) the Trust receives an undertaking by or on behalf of the Trustee,
    officer, employee or agent of the Trust to repay the advance if it is not
    ultimately determined that such person is entitled to be indemnified by
    the Trust; and

        (3) either, (i) such person provides a security for his undertaking,
    or

          (ii) the Trust is insured against losses by reason of any lawful
        advances, or

          (iii) a determination, based on a review of readily available facts,
        that there is reason to believe that such person ultimately will be
        found entitled to indemnification, is made by either--

                (A) a majority of a quorum which consists of Trustees who are
            neither "interested persons" of the Trust, as defined in Section
            2(a)(19) of the 1940 Act, nor parties to the action, suit or
            proceeding, or

                (B) an independent legal counsel in a written opinion.

     (f) The indemnification provided by this Section shall not be deemed
exclusive of any other rights to which a person may be entitled under any
by-law, agreement, vote of Shareholders or disinterested Trustees or otherwise,
both as to action in his official capacity and as to action in another capacity
while holding the office, and shall continue as to a person who has ceased to
be a Trustee, officer, employee, or agent and inure to the benefit of the
heirs, executors and administrators of such person; provided that no


                                       5
<PAGE>

person may satisfy any right of indemnity or reimbursement granted herein or to
which he may be otherwise entitled except out of the property of the Trust, and
no Shareholder shall be personally liable with respect to any claim for
indemnity or reimbursement or otherwise.

     (g) The Trust may purchase and maintain insurance on behalf of any person
who is or was a Trustee, officer, employee, or agent of the Trust, against any
liability asserted against him and incurred by him in any such capacity, or
arising out of his status as such. However, in no event will the Trust purchase
insurance to indemnify any officer or Trustee against liability for any act for
which the Trust itself is not permitted to indemnify him.

     (h) Nothing contained in this Section shall be construed to protect any
Trustee or officer of the Trust against any liability to the Trust or to its
security holders to which he would otherwise be subject by reason of willful
misfeasance, bad faith, gross negligence or reckless disregard of the duties
involved in the conduct of his office.


                                   ARTICLE V

                                  COMMITTEES

     SECTION 5.1. Executive and Other Committees. The Trustees, by resolution
adopted by a majority of the Trustees, may designate an Executive Committee
and/or committees, each committee to consist of two (2) or more of the Trustees
of the Trust and may delegate to such committees, in the intervals between
meetings of the Trustees, any or all of the powers of the Trustees in the
management of the business and affairs of the Trust. In the absence of any
member of any such committee, the members thereof present at any meeting,
whether or not they constitute a quorum, may appoint a Trustee to act in place
of such absent member. Each such committee shall keep a record of its
proceedings.

     The Executive Committee and any other committee shall fix its own rules or
procedure, but the presence of at least fifty percent (50%) of the members of
the whole committee shall in each case be necessary to constitute a quorum of
the committee and the affirmative vote of the majority of the members of the
committee present at the meeting shall be necessary to take action.

     All actions of the Executive Committee shall be reported to the Trustees
at the meeting thereof next succeeding to the taking of such action.

     SECTION 5.2. Advisory Committee. The Trustees may appoint an advisory
committee which shall be composed of persons who do not serve the Trust in any
other capacity and which shall have advisory functions with respect to the
investments of the Trust but which shall have no power to determine that any
security or other investment shall be purchased, sold or otherwise disposed of
by the Trust. The number of persons constituting any such advisory committee
shall be determined from time to time by the Trustees. The members of any such
advisory committee may receive compensation for their services and may be
allowed such fees and expenses for the attendance at meetings as the Trustees
may from time to time determine to be appropriate.

     SECTION 5.3. Committee Action Without Meeting. The provisions of these
By-Laws covering notices and meetings to the contrary notwithstanding, and
except as required by law, any action required or permitted to be taken at any
meeting of any Committee of the Trustees appointed pursuant to Section 5.1 of
these By-Laws may be taken without a meeting if a consent in writing setting
forth the action shall be signed by all members of the Committee entitled to
vote upon the action and such written consent is filed with the records of the
proceedings of the Committee.


                                   ARTICLE VI

                                   OFFICERS

     SECTION 6.1. Executive Officers. The executive officers of the Trust shall
be a Chairman, a President, one or more Vice Presidents, a Secretary and a
Treasurer. The Chairman shall be selected from among the Trustees but none of
the other executive officers need be a Trustee. Two or more offices, except
those of President and any Vice President, may be held by the same person, but
no officer shall execute,


                                       6
<PAGE>

acknowledge or verify any instrument in more than one capacity. The executive
officers of the Trust shall be elected annually by the Trustees and each
executive officer so elected shall hold office until his successor is elected
and has qualified.


     SECTION 6.2. Other Officers and Agents. The Trustees may also elect one or
more Assistant Vice Presidents, Assistant Secretaries and Assistant Treasurers
and may elect, or may delegate to the President the power to appoint, such
other officers and agents as the Trustees shall at any time or from time to
time deem advisable.


     SECTION 6.3. Term and Removal and Vacancies. Each officer of the Trust
shall hold office until his successor is elected and has qualified. Any officer
or agent of the Trust may be removed by the Trustees whenever, in their
judgment, the best interests of the Trust will be served thereby, but such
removal shall be without prejudice to the contractual rights, if any, of the
person so removed.


     SECTION 6.4. Compensation of Officers. The compensation of officers and
agents of the Trust shall be fixed by the Trustees, or by the Chairman to the
extent provided by the Trustees with respect to officers appointed by the
President.


     SECTION 6.5. Power and Duties. All officers and agents of the Trust, as
between themselves and the Trust, shall have such authority and perform such
duties in the management of the Trust as may be provided in or pursuant to
these By-Laws, or to the extent not so provided, as may be prescribed by the
Trustees; provided, that no rights of any third party shall be affected or
impaired by any such By-Law or resolution of the Trustees unless he has
knowledge thereof.


     SECTION 6.6. The Chairman.  The Chairman shall preside at all meetings of
the Shareholders and of the Trustees, shall be a signatory on all Annual and
Semi-Annual Reports as may be sent to shareholders, and he shall perform such
other duties as the Trustees may from time to time prescribe.


     SECTION 6.7. The President. (a) The President shall be the chief executive
officer of the Trust; he shall have general and active management of the
business of the Trust, shall see that all orders and resolutions of the Board
of Trustees are carried into effect, and, in connection therewith, shall be
authorized to delegate to one or more Vice Presidents such of his powers and
duties at such times and in such manner as he may deem advisable.


     (b) In the absence of the Chairman, the President shall preside at all
meetings of the shareholders and the Board of Trustees; and he shall perform
such other duties as the Board of Trustees may from time to time prescribe.


     SECTION 6.8. The Vice Presidents. The Vice Presidents shall be of such
number and shall have such titles as may be determined from time to time by the
Trustees. The Vice President, or, if there be more than one, the Vice
Presidents in the order of their seniority as may be determined from time to
time by the Trustees or the President, shall, in the absence or disability of
the President, exercise the powers and perform the duties of the President, and
he or they shall perform such other duties as the Trustees or the President may
from time to time prescribe.


     SECTION 6.9. The Assistant Vice Presidents. The Assistant Vice President,
or, if there be more than one, the Assistant Vice Presidents, shall perform
such duties and have such powers as may be assigned them from time to time by
the Trustees or the President.


     SECTION 6.10. The Secretary. The Secretary shall attend all meetings of
the Trustees and all meetings of the Shareholders and record all the
proceedings of the meetings of the Shareholders and of the Trustees in a book
to be kept for that purpose, and shall perform like duties for the standing
committees when required. He shall give, or cause to be given, notice of all
meetings of the Shareholders and special meetings of the Trustees, and shall
perform such other duties and have such powers as the Trustees, or the
President, may from time to time prescribe. He shall keep in safe custody the
seal of the Trust and affix or cause the same to be affixed to any instrument
requiring it, and, when so affixed, it shall be attested by his signature or by
the signature of an Assistant Secretary.


                                       7
<PAGE>

     SECTION 6.11. The Assistant Secretaries. The Assistant Secretary, or, if
there be more than one, the Assistant Secretaries in the order determined by
the Trustees or the President, shall, in the absence or disability of the
Secretary, perform the duties and exercise the powers of the Secretary and
shall perform such duties and have such other powers as the Trustees or the
President may from time to time prescribe.

     SECTION 6.12. The Treasurer. The Treasurer shall be the chief financial
officer of the Trust. He shall keep or cause to be kept full and accurate
accounts of receipts and disbursements in books belonging to the Trust, and he
shall render to the Trustees and the President, whenever any of them require
it, an account of his transactions as Treasurer and of the financial condition
of the Trust; and he shall perform such other duties as the Trustees, or the
President, may from time to time prescribe.

     SECTION 6.13. The Assistant Treasurers. The Assistant Treasurer, or, if
there shall be more than one, the Assistant Treasurers in the order determined
by the Trustees or the President, shall, in the absence or disability of the
Treasurer, perform the duties and exercise the powers of the Treasurer and
shall perform such other duties and have such other powers as the Trustees, or
the President, may from time to time prescribe.

     SECTION 6.14. Delegation of Duties. Whenever an officer is absent or
disabled, or whenever for any reason the Trustees may deem it desirable, the
Trustees may delegate the powers and duties of an officer or officers to any
other officer or officers or to any Trustee or Trustees.


                                  ARTICLE VII

                          DIVIDENDS AND DISTRIBUTIONS

     Subject to any applicable provisions of law and the Declaration, dividends
and distributions upon the Shares may be declared at such intervals as the
Trustees may determine, in cash, in securities or other property, or in Shares,
from any sources permitted by law, all as the Trustees shall from time to time
determine.

     Inasmuch as the computation of net income and net profits from the sales
of securities or other properties for federal income tax purposes may vary from
the computation thereof on the records of the Trust, the Trustees shall have
power, in their discretion, to distribute as income dividends and as capital
gain distributions, respectively, amounts sufficient to enable the Trust to
avoid or reduce liability for federal income taxes.


                                  ARTICLE VIII

                            CERTIFICATES OF SHARES

     SECTION 8.1. Certificates of Shares. Certificates for Shares of each
series or class of Shares shall be in such form and of such design as the
Trustees shall approve, subject to the right of the Trustees to change such
form and design at any time or from time to time, and shall be entered in the
records of the Trust as they are issued. Each such certificate shall bear a
distinguishing number; shall exhibit the holder's name and certify the number
of full Shares owned by such holder; shall be signed by or in the name of the
Trust by the President, or a Vice President, and countersigned by the Secretary
or an Assistant Secretary or the Treasurer and an Assistant Treasurer of the
Trust; shall be sealed with the seal; and shall contain such recitals as may be
required by law. Where any certificate is signed by a Transfer Agent or by a
Registrar, the signature of such officers and the seal may be facsimile,
printed or engraved. The Trust may, at its option, determine not to issue a
certificate or certificates to evidence Shares owned of record by any
Shareholder.

     In case any officer or officers who shall have signed, or whose facsimile
signature or signatures shall appear on, any such certificate or certificates
shall cease to be such officer or officers of the Trust, whether because of
death, resignation or otherwise, before such certificate or certificates shall
have been delivered by the Trust, such certificate or certificates shall,
nevertheless, be adopted by the Trust and be issued and delivered as though the
person or persons who signed such certificate or certificates or whose
facsimile signature or signatures shall appear therein had not ceased to be
such officer or officers of the Trust.


                                       8
<PAGE>

     No certificate shall be issued for any share until such share is fully
paid.


     SECTION 8.2. Lost, Stolen, Destroyed and Mutilated Certificates. The
Trustees may direct a new certificate or certificates to be issued in place of
any certificate or certificates theretofore issued by the Trust alleged to have
been lost, stolen or destroyed, upon satisfactory proof of such loss, theft, or
destruction; and the Trustees may, in their discretion, require the owner of
the lost, stolen or destroyed certificate, or his legal representative, to give
to the Trust and to such Registrar, Transfer Agent and/or Transfer Clerk as may
be authorized or required to countersign such new certificate or certificates,
a bond in such sum and of such type as they may direct, and with such surety or
sureties, as they may direct, as indemnity against any claim that may be
against them or any of them on account of or in connection with the alleged
loss, theft or destruction of any such certificate.


                                   ARTICLE IX

                                   CUSTODIAN


     SECTION 9.1. Appointment and Duties. The Trust shall at times employ a
bank or trust company having capital, surplus and undivided profits of at least
five million dollars ($5,000,000) as custodian with authority as its agent, but
subject to such restrictions, limitations and other requirements, if any, as
may be contained in these By-Laws and the 1940 Act:


      (1) to receive and hold the securities owned by the Trust and deliver
    the same upon written or electronically transmitted order;


      (2) to receive and receipt for any moneys due to the Trust and deposit
    the same in its own banking department or elsewhere as the Trustees may
    direct;


      (3) to disburse such funds upon orders or vouchers;


all upon such basis of compensation as may be agreed upon between the Trustees
and the custodian. If so directed by a Majority Shareholder Vote, the custodian
shall deliver and pay over all property of the Trust held by it as specified in
such vote.


     The Trustees may also authorize the custodian to employ one or more
sub-custodians from time to time to perform such of the acts and services of
the custodian and upon such terms and conditions as may be agreed upon between
the custodian and such sub-custodian and approved by the Trustees.


     SECTION 9.2. Central Certificate System. Subject to such rules,
regulations and orders as the Commission may adopt, the Trustees may direct the
custodian to deposit all or any part of the securities owned by the Trust in a
system for the central handling of securities established by a national
securities exchange or a national securities association registered with the
Commission under the Securities Exchange Act of 1934, or such other person as
may be permitted by the Commission, or otherwise in accordance with the 1940
Act, pursuant to which system all securities of any particular class or series
of any issuer deposited within the system are treated as fungible and may be
transferred or pledged by bookkeeping entry without physical delivery of such
securities, provided that all such deposits shall be subject to withdrawal only
upon the order of the Trust.


                                   ARTICLE X

                               WAIVER OF NOTICE


     Whenever any notice of the time, place or purpose of any meeting of
Shareholders, Trustees, or of any committee is required to be given in
accordance with law or under the provisions of the Declaration or these
By-Laws, a waiver thereof in writing, signed by the person or persons entitled
to such notice and filed with the records of the meeting, whether before or
after the holding thereof, or actual attendance at the meeting of shareholders,
Trustees or committee, as the case may be, in person, shall be deemed
equivalent to the giving of such notice to such person.


                                       9
<PAGE>

                                  ARTICLE XI

                                 MISCELLANEOUS

     SECTION 11.1. Location of Books and Records. The books and records of the
Trust may be kept outside the Commonwealth of Massachusetts at such place or
places as the Trustees may from time to time determine, except as otherwise
required by law.

     SECTION 11.2 Record Date. The Trustees may fix in advance a date as the
record date for the purpose of determining the Shareholders entitled to (i)
receive notice of, or to vote at, any meeting of Shareholders, or (ii) receive
payment of any dividend or the allotment of any rights, or in order to make a
determination of Shareholders for any other proper purpose. The record date, in
any case, shall not be more than one hundred eighty (180) days, and in the case
of a meeting of Shareholders not less than ten (10) days, prior to the date on
which such meeting is to be held or the date on which such other particular
action requiring determination of Shareholders is to be taken, as the case may
be. In the case of a meeting of Shareholders, the meeting date set forth in the
notice to Shareholders accompanying the proxy statement shall be the date used
for purposes of calculating the 180 day or 10 day period, and any adjourned
meeting may be reconvened without a change in record date. In lieu of fixing a
record date, the Trustees may provide that the transfer books shall be closed
for a stated period but not to exceed, in any case, twenty (20) days. If the
transfer books are closed for the purpose of determining Shareholders entitled
to notice of a vote at a meeting of Shareholders, such books shall be closed
for at least ten (10) days immediately preceding the meeting.

     SECTION 11.3. Seal. The Trustees shall adopt a seal, which shall be in
such form and shall have such inscription thereon as the Trustees may from time
to time provide. The seal of the Trust may be affixed to any document, and the
seal and its attestation may be lithographed, engraved or otherwise printed on
any document with the same force and effect as if it had been imprinted and
attested manually in the same manner and with the same effect as if done by a
Massachusetts business corporation under Massachusetts law.

     SECTION 11.4. Fiscal Year. The fiscal year of the Trust shall end on such
date as the Trustees may by resolution specify, and the Trustees may by
resolution change such date for future fiscal years at any time and from time
to time.

     SECTION 11.5. Orders for Payment of Money. All orders or instructions for
the payment of money of the Trust, and all notes or other evidences of
indebtedness issued in the name of the Trust, shall be signed by such officer
or officers or such other person or persons as the Trustees may from time to
time designate, or as may be specified in or pursuant to the agreement between
the Trust and the bank or trust company appointed as Custodian of the
securities and funds of the Trust.


                                  ARTICLE XII

                      COMPLIANCE WITH FEDERAL REGULATIONS

     The Trustees are hereby empowered to take such action as they may deem to
be necessary, desirable or appropriate so that the Trust is or shall be in
compliance with any federal or state statute, rule or regulation with which
compliance by the Trust is required.


                                  ARTICLE XIII

                                  AMENDMENTS

     These By-Laws may be amended, altered, or repealed, or new By-Laws may be
adopted, (a) by a Majority Shareholder Vote, or (b) by the Trustees; provided,
however, that no By-Law may be amended, adopted or repealed by the Trustees if
such amendment, adoption or repeal requires, pursuant to law, the Declaration,
or these By-Laws, a vote of the Shareholders. The Trustees shall in no event
adopt By-Laws which are in conflict with the Declaration, and any apparent
inconsistency shall be construed in favor of the related provisions in the
Declaration.


                                       10
<PAGE>

                                  ARTICLE XIV

                             DECLARATION OF TRUST


     The Declaration of Trust establishing Morgan Stanley Dean Witter Federal
Securities Trust, dated November 20, 1986, a copy of which, together with all
amendments thereto, is on file in the office of the Secretary of the
Commonwealth of Massachusetts, provides that the name Morgan Stanley Dean
Witter Federal Securities Trust refers to the Trustees under the Declaration
collectively as Trustees, but not as individuals or personally; and no Trustee,
Shareholder, officer, employee or agent of Morgan Stanley Dean Witter Federal
Securities Trust shall be held to any personal liability, nor shall resort be
had to their private property for the satisfaction of any obligation or claim
or otherwise, in connection with the affairs of said Morgan Stanley Dean Witter
Federal Securities Trust, but the Trust Estate only shall be liable.


                                       11

<PAGE>


CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the use in the Statement of Additional Information 
constituting part of this Post-Effective Amendment No. 15 to the registration
statement on Form N-1A (the "Registration Statement") of our report dated 
December 7, 1998, relating to the financial statements and financial 
highlights of Morgan Stanley Dean Witter Federal Securities Trust, formerly 
Dean Witter Federal Securities Trust, which appears in such Statement of 
Additional Information, and to the incorporation by reference of our report 
into the Prospectus which constitutes part of this Registration Statement. We
also consent to the references to us under the headings "Custodian and 
Independent Accountants" and "Experts" in such Statement of Additional 
Information and to the reference to us under the heading "Financial 
Highlights" in such Prospectus.


PricewaterhouseCoopers LLP
1177 Avenue of the Americas
New York, New York 10036
February 22, 1999





<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<SERIES>
   <NUMBER> 011
   <NAME> MSDW FEDERAL SECURITIES TRUST (CLASS A)
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      592,769,784
<INVESTMENTS-AT-VALUE>                     652,737,792
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<OTHER-ITEMS-LIABILITIES>                    2,789,460
<TOTAL-LIABILITIES>                         12,689,660
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<PAID-IN-CAPITAL-COMMON>                   641,992,994
<SHARES-COMMON-STOCK>                          499,626
<SHARES-COMMON-PRIOR>                          217,137
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<OVERDISTRIBUTION-NII>                               0
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<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           47,209,827
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               9,489,186
<NET-INVESTMENT-INCOME>                     37,720,641
<REALIZED-GAINS-CURRENT>                       706,711
<APPREC-INCREASE-CURRENT>                   22,700,373
<NET-CHANGE-FROM-OPS>                       61,127,725
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (189,298)
<DISTRIBUTIONS-OF-GAINS>                             0
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<NUMBER-OF-SHARES-SOLD>                        494,041
<NUMBER-OF-SHARES-REDEEMED>                  (228,754)
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<NET-CHANGE-IN-ASSETS>                      27,376,504
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        3,403,780
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<GROSS-EXPENSE>                              9,489,186
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<PER-SHARE-NAV-BEGIN>                             9.45
<PER-SHARE-NII>                                   0.64
<PER-SHARE-GAIN-APPREC>                           0.34
<PER-SHARE-DIVIDEND>                            (0.64)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.79
<EXPENSE-RATIO>                                   0.93
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<SERIES>
   <NUMBER> 012
   <NAME> MSDW FEDERAL SECURITIES TRUST (CLASS B)
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      592,769,784
<INVESTMENTS-AT-VALUE>                     652,737,792
<RECEIVABLES>                               12,944,702
<ASSETS-OTHER>                                 273,884
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             665,956,378
<PAYABLE-FOR-SECURITIES>                     9,900,200
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,789,460
<TOTAL-LIABILITIES>                         12,689,660
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   641,992,994
<SHARES-COMMON-STOCK>                       65,732,418
<SHARES-COMMON-PRIOR>                       66,543,208
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                   (47,464,388)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    58,738,112
<NET-ASSETS>                               639,212,484
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           47,209,827
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               9,489,186
<NET-INVESTMENT-INCOME>                     37,720,641
<REALIZED-GAINS-CURRENT>                       706,711
<APPREC-INCREASE-CURRENT>                   22,700,373
<NET-CHANGE-FROM-OPS>                       61,127,725
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (37,280,239)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     11,059,549
<NUMBER-OF-SHARES-REDEEMED>               (14,006,213)
<SHARES-REINVESTED>                          2,135,874
<NET-CHANGE-IN-ASSETS>                      27,376,504
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        3,403,780
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              9,489,186
<AVERAGE-NET-ASSETS>                       611,850,028
<PER-SHARE-NAV-BEGIN>                             9.38
<PER-SHARE-NII>                                   0.58
<PER-SHARE-GAIN-APPREC>                           0.36
<PER-SHARE-DIVIDEND>                            (0.58)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.72
<EXPENSE-RATIO>                                   1.54
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

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<PAGE>
<ARTICLE> 6
<SERIES>
   <NUMBER> 013
   <NAME> MSDW FEDERAL SECURITIES TRUST (CLASS C)
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      592,769,784
<INVESTMENTS-AT-VALUE>                     652,737,792
<RECEIVABLES>                               12,944,702
<ASSETS-OTHER>                                 273,884
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             665,956,378
<PAYABLE-FOR-SECURITIES>                     9,900,200
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,789,460
<TOTAL-LIABILITIES>                         12,689,660
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   641,992,994
<SHARES-COMMON-STOCK>                          735,359
<SHARES-COMMON-PRIOR>                           76,358
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                   (47,464,388)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    58,738,112
<NET-ASSETS>                                 7,204,246
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           47,209,827
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               9,489,186
<NET-INVESTMENT-INCOME>                     37,720,641
<REALIZED-GAINS-CURRENT>                       706,711
<APPREC-INCREASE-CURRENT>                   22,700,373
<NET-CHANGE-FROM-OPS>                       61,127,725
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (191,250)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        698,033
<NUMBER-OF-SHARES-REDEEMED>                   (53,457)
<SHARES-REINVESTED>                             14,425
<NET-CHANGE-IN-ASSETS>                      27,376,504
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        3,403,780
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              9,489,186
<AVERAGE-NET-ASSETS>                         3,241,521
<PER-SHARE-NAV-BEGIN>                             9.44
<PER-SHARE-NII>                                   0.58
<PER-SHARE-GAIN-APPREC>                           0.36
<PER-SHARE-DIVIDEND>                            (0.58)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.80
<EXPENSE-RATIO>                                   1.54
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<SERIES>
   <NUMBER> 014
   <NAME> MSDW FEDERAL SECURITES TRUST (CLASS D)
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1998
<PERIOD-END>                               OCT-31-1998
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<INVESTMENTS-AT-VALUE>                     652,737,792
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<SENIOR-LONG-TERM-DEBT>                              0
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<SENIOR-EQUITY>                                      0
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<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
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<DISTRIBUTIONS-OF-GAINS>                             0
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<NUMBER-OF-SHARES-REDEEMED>                   (14,398)
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<ACCUMULATED-NII-PRIOR>                              0
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</TABLE>


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