TCW DW INCOME & GROWTH FUND
497, 1998-04-08
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<PAGE>
   [LOGO]
                      INCOME AND
                      GROWTH FUND
 
                      PROSPECTUS
                      MARCH 31, 1998
 
TCW/DW Income and Growth Fund (the "Fund") is an open-end, non-diversified
management investment company, whose investment objective is to generate high
total return by providing a high level of current income and the potential for
capital appreciation. The Fund seeks to achieve its investment objective by
investing primarily in convertible securities, fixed-income securities and
common stocks. The Fund will invest at least 50% of its total assets in a
combination of equity securities and fixed-income securities with equity
components.
 
THE FUND MAY INVEST WITHOUT LIMITATION IN CONVERTIBLE AND FIXED-INCOME
SECURITIES RATED BELOW INVESTMENT GRADE (COMMONLY KNOWN AS "JUNK BONDS"),
although the Fund will only invest in convertible and fixed-income securities
rated at least B by either Moody's Investor's Service, Inc. or Standard & Poor's
Corporation or, if not rated, determined to be of comparable quality.
INVESTMENTS OF THIS TYPE ARE SUBJECT TO GREATER RISK, INCLUDING THE RISK OF
DEFAULT, THAN HIGHER RATED SECURITIES, AND ARE CONSIDERED TO BE SPECULATIVE WITH
REGARD TO THE PAYMENT OF INTEREST AND RETURN OF PRINCIPAL. INVESTORS SHOULD
CAREFULLY ASSESS THE RISKS ASSOCIATED WITH AN INVESTMENT IN THE FUND. (SEE
"INVESTMENT OBJECTIVE AND POLICIES.")
 
The Fund offers four classes of shares (each, a "Class"), each with a different
combination of sales charges, ongoing fees and other features. The different
distribution arrangements permit an investor to choose the method of purchasing
shares that the investor believes is most beneficial given the amount of the
purchase, the length of time the investor expects to hold the shares and other
relevant circumstances. (See "Purchase of Fund Shares--Alternative Purchase
Arrangements.")
 
This Prospectus sets forth concisely the information you should know before
investing in the Fund. It should be read and retained for future reference.
Additional information about the Fund is contained in the Statement of
Additional Information, dated March 31, 1998, which has been filed with the
Securities and Exchange Commission, and which is available at no charge upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.
 
TABLE OF CONTENTS
Prospectus Summary 2
Summary of Fund Expenses 5
Financial Highlights 6
The Fund and its Management 9
Investment Objective and Policies 9
Risk Considerations 10
Investment Restrictions 15
Purchase of Fund Shares 15
Shareholder Services 23
Repurchases and Redemptions 25
Dividends, Distributions and Taxes 25
Performance Information 26
Additional Information 26
Appendix 28
 
SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, AND THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.
 
         TCW/DW INCOME AND
           GROWTH FUND
         Two World Trade Center
         New York, New York 10048
         (212) 392-2550 or
         (800) 869-NEWS (toll free)
 
         Dean Witter Distributors Inc.
         Distributor
 
    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
  PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION
                     TO THE CONTRARY IS A CRIMINAL OFFENSE.
<PAGE>
PROSPECTUS SUMMARY
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                   <C>
THE                   The Fund is organized as a Massachusetts business trust, and is an open-end,
FUND                  non-diversified management investment company investing primarily in convertible
                      securities, fixed-income securities and common stocks.
- ---------------------------------------------------------------------------------------------------------
SHARES                Shares of beneficial interest with $0.01 par value (see page 26). The Fund offers four
OFFERED               Classes of shares, each with a different combination of sales charges, ongoing fees
                      and other features (see pages 15-22).
- ---------------------------------------------------------------------------------------------------------
MINIMUM               The minimum initial investment for each Class is $1,000 ($100 if the account is opened
PURCHASE              through EasyInvest-SM-). Class D shares are only available to persons investing $5
                      million ($25 million for certain qualified plans) or more and to certain other limited
                      categories of investors. For the purpose of meeting the minimum $5 million (or $25
                      million) investment for Class D shares, and subject to the $1,000 minimum initial
                      investment for each Class of the Fund, an investor's existing holdings of Class A
                      shares and concurrent investments in Class D shares of the Fund and other multiple
                      class funds for which Dean Witter Services Company Inc. serves as manager and TCW
                      Funds Management, Inc. serves as investment adviser will be aggregated. The minimum
                      subsequent investment is $100 (see page 15).
- ---------------------------------------------------------------------------------------------------------
INVESTMENT            The investment objective of the Fund is to generate high total return by providing a
OBJECTIVE             high level of current income and the potential for capital appreciation.
- ---------------------------------------------------------------------------------------------------------
MANAGER               Dean Witter Services Company Inc. (the "Manager"), a wholly-owned subsidiary of Dean
                      Witter InterCapital Inc. ("InterCapital"), is the Fund's Manager. The Manager also
                      serves as Manager to ten other investment companies which are advised by TCW Funds
                      Management, Inc. (the "TCW/DW Funds"). The Manager and InterCapital serve in various
                      investment management, advisory, management and administrative capacities to a total
                      of 101 investment companies and other portfolios with assets of approximately $110
                      billion at February 28, 1998 (see page 9).
- ---------------------------------------------------------------------------------------------------------
ADVISER               TCW Funds Management, Inc. (the "Adviser") is the Fund's investment adviser. In
                      addition to the Fund, the Adviser serves as investment adviser to ten other TCW/DW
                      Funds. As of February 28, 1998, the Adviser and its affiliates had over $50 billion
                      under management or committed to management in various fiduciary or advisory
                      capacities, primarily from institutional investors (see page 9).
- ---------------------------------------------------------------------------------------------------------
MANAGEMENT            The Manager receives a monthly fee at the annual rate of 0.45% of daily net assets,
AND ADVISORY          scaled down on assets over $500 million. The Adviser receives a monthly fee at an
FEES                  annual rate of 0.30% of daily net assets, scaled down on assets over $500 million (see
                      page 9).
- ---------------------------------------------------------------------------------------------------------
DISTRIBUTOR AND       Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a distribution
DISTRIBUTION          plan pursuant to Rule 12b-1 under the Investment Company Act (the "12b-1 Plan") with
FEE                   respect to the distribution fees paid by the Class A, Class B and Class C shares of
                      the Fund to the Distributor. The entire 12b-1 fee payable by Class A and a portion of
                      the 12b-1 fee payable by each of Class B and Class C 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 within the meaning of the National
                      Association of Securities Dealers, Inc. guidelines. The remaining portion of the 12b-1
                      fee, if any, is characterized as an asset-based sales charge (see pages 15 and 21).
</TABLE>
 
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                                       2
<PAGE>
- --------------------------------------------------------------------------------
<TABLE>
<S>                   <C>
ALTERNATIVE           Four classes of shares are offered:
PURCHASE              - Class A shares are offered with a front-end sales charge, starting at 4.25% and
ARRANGEMENTS          reduced for larger purchases. Investments of $1 million or more (and investments by
                      certain other limited categories of investors) are not subject to any sales charge at
                      the time of purchase but a contingent deferred sales charge ("CDSC") of 1.0% may be
                      imposed on redemptions within one year of purchase. The Fund is authorized to
                      reimburse the Distributor for specific expenses incurred in promoting the distribution
                      of the Fund's Class A shares and servicing shareholder accounts pursuant to the Fund's
                      12b-1 Plan. Reimbursement may in no event exceed an amount equal to payments at an
                      annual rate of 0.25% of average daily net assets of the Class (see pages 15, 18 and
                      21).
 
                      - Class B shares are offered without a front-end sales charge, but will in most cases
                      be subject to a CDSC (scaled down from 5.0% to 1.0%) if redeemed within six years
                      after purchase. The CDSC will be imposed on any redemption of shares if after such
                      redemption the aggregate current value of a Class B account with the Fund falls below
                      the aggregate amount of the investor's purchase payments made during the six years
                      preceding the redemption. A different CDSC schedule applies to investments by certain
                      qualified plans. Class B shares are also subject to a 12b-1 fee assessed at the annual
                      rate of 0.75% of the average daily net assets of Class B. Shares of the Fund held
                      prior to July 28, 1997 which were acquired in exchange for shares of TCW/DW Funds sold
                      with a CDSC, including shares acquired through reinvestment of dividends and
                      distributions thereon, have been designated Class B shares. Shares held before May 1,
                      1997 that have been designated Class B shares will convert to Class A shares in May,
                      2007. In all other instances, Class B shares convert to Class A shares approximately
                      ten years after the date of the original purchase (see pages 15, 19 and 21).
 
                      - Class C shares are offered without a front-end sales charge, but will in most cases
                      be subject to a CDSC of 1.0% if redeemed within one year after purchase. The Fund is
                      authorized to reimburse the Distributor for specific expenses incurred in promoting
                      the distribution of the Fund's Class C shares and servicing shareholder accounts
                      pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount
                      equal to payments at an annual rate of 0.75% of average daily net assets of the Class.
                      All shares of the Fund held prior to July 28, 1997 (other than shares which were
                      acquired in exchange for shares of TCW/DW Funds offered with a CDSC and shares
                      acquired through reinvestment of dividends and distributions thereon) have been
                      designated Class C shares. Shares held before July 28, 1997 that have been designated
                      Class C shares are not subject to the 1.0% CDSC (see pages 15 and 21).
 
                      - Class D shares are offered only to investors meeting an initial investment minimum
                      of $5 million ($25 million for certain qualified plans) and to certain other limited
                      categories of investors. Class D shares are offered without a front-end sales charge
                      or CDSC and are not subject to any 12b-1 fee (see pages 15 and 21).
</TABLE>
 
- --------------------------------------------------------------------------------
 
                                       3
<PAGE>
- --------------------------------------------------------------------------------
<TABLE>
<S>                   <C>
DIVIDENDS             Income dividends are paid quarterly. Capital gains, if any, will be distributed at
AND CAPITAL           least annually. The Fund may, however, determine to retain all or part of any net
GAINS                 long-term capital gains in any year for reinvestment. Dividends and capital gains
DISTRIBUTIONS         distributions are automatically reinvested in additional shares of the same Class at
                      net asset value unless the shareholder elects to receive cash (see page 25). Shares
                      acquired by dividend and distribution reinvestment will not be subject to any sales
                      charge or CDSC (see pages 23 and 25).
- ---------------------------------------------------------------------------------------------------------
REDEMPTION            Shares are redeemable by the shareholder at net asset value less any applicable CDSC
                      on Class A, Class B or Class C shares. An account may be redeemed involuntarily if the
                      total value of the account is less than $100 or, if the account was opened through
                      EasyInvest-SM-, if after twelve months the shareholder has invested less than $1,000
                      in the account (see page 25).
- ---------------------------------------------------------------------------------------------------------
RISK                  The net asset value of the Fund's shares will fluctuate with changes in the market
CONSIDERATIONS        value of the Fund's portfolio securities. The value of the Fund's convertible and
                      fixed-income portfolio securities generally increase or decrease due to changes in
                      prevailing interest rates. Generally, a rise in interest rates will result in a
                      decrease in value, while a drop in interest rates will result in an increase in value.
                      The high yield, high risk fixed-income securities in which the Fund may invest are
                      subject to greater risk of loss of income and principal than higher rated, lower
                      yielding fixed-income securities. The prices of high yield, high risk securities have
                      been found to be less sensitive to changes in prevailing interest rates than higher
                      rated investments, but are likely to be more sensitive to adverse economic changes or
                      individual corporate developments. The Fund is a non-diversified investment company
                      and, as such, is not subject to the diversification requirements of the Investment
                      Company Act of 1940, as amended. As a result, a relatively high percentage of the
                      Fund's assets may be invested in a limited number of issuers. However, the Fund
                      intends to continue to qualify as a regulated investment company under the federal
                      income tax laws and, as such, is subject to the diversification requirements of the
                      Internal Revenue Code. The Fund may invest up to 25% of its total assets in non-dollar
                      denominated foreign securities, which may entail special risks (see page 10). The Fund
                      also may engage in options and futures transactions and may purchase securities on a
                      when-issued, delayed delivery or "when, as and if issued" basis, which involve certain
                      additional risks (see page 12).
</TABLE>
 
- --------------------------------------------------------------------------------
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
              ELSEWHERE IN THIS PROSPECTUS AND IN THE STATEMENT OF
                            ADDITIONAL INFORMATION.
 
                                       4
<PAGE>
SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------
 
The following table illustrates all expenses and fees that a shareholder of the
Fund will incur. The expenses and fees set forth in the table are based on the
expenses and fees for the fiscal year ended January 31, 1998.
 
<TABLE>
<CAPTION>
                                                                                   CLASS A    CLASS B    CLASS C    CLASS D
                                                                                  ---------   -------   ---------   -------
<S>                                                                               <C>         <C>       <C>         <C>
SHAREHOLDER TRANSACTION EXPENSES
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price)...   4.25%(1)    None      None        None
Sales Charge Imposed on Dividend Reinvestments..................................   None        None      None        None
Maximum Contingent Deferred Sales Charge (as a percentage of original purchase
  price or redemption proceeds).................................................   None(2)     5.00%(3)  1.00%(4)    None
Redemption Fees.................................................................   None        None      None        None
Exchange Fee....................................................................   None        None      None        None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management and Advisory Fees....................................................   0.75%       0.75%     0.75%       0.75%
12b-1 Fees (5) (6)..............................................................   0.25%       0.75%     0.75%       None
Other Expenses..................................................................   0.51%       0.51%     0.51%       0.51%
Total Fund Operating Expenses (7)...............................................   1.51%       2.01%     2.01%       1.26%
</TABLE>
 
- ---------------
(1) REDUCED FOR PURCHASES OF $25,000 AND OVER (SEE "PURCHASE OF FUND
    SHARES--INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES").
 
(2) INVESTMENTS THAT ARE NOT SUBJECT TO ANY SALES CHARGE AT THE TIME OF PURCHASE
    ARE SUBJECT TO A CDSC OF 1.00% THAT WILL BE IMPOSED ON REDEMPTIONS MADE
    WITHIN ONE YEAR AFTER PURCHASE, EXCEPT FOR CERTAIN SPECIFIC CIRCUMSTANCES
    (SEE "PURCHASE OF FUND SHARES--INITIAL SALES CHARGE ALTERNATIVE--CLASS A
    SHARES").
 
(3) THE CDSC IS SCALED DOWN TO 1.00% DURING THE SIXTH YEAR, REACHING ZERO
    THEREAFTER.
 
(4) ONLY APPLICABLE TO REDEMPTIONS MADE WITHIN ONE YEAR AFTER PURCHASE (SEE
    "PURCHASE OF FUND SHARES--LEVEL LOAD ALTERNATIVE--CLASS C SHARES"). SHARES
    OF THE FUND HELD PRIOR TO JULY 28, 1997 THAT HAVE BEEN DESIGNATED CLASS C
    SHARES ARE NOT SUBJECT TO THE 1.00% CDSC.
 
(5) THE 12B-1 FEE IS ACCRUED DAILY AND PAYABLE MONTHLY. THE ENTIRE 12B-1 FEE
    PAYABLE BY CLASS A AND A PORTION OF THE 12B-1 FEE PAYABLE BY EACH OF CLASS B
    AND CLASS C 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 WITHIN THE MEANING OF NATIONAL ASSOCIATION OF
    SECURITIES DEALERS, INC. ("NASD") GUIDELINES AND ARE PAYMENTS MADE FOR
    PERSONAL SERVICE AND/OR MAINTENANCE OF SHAREHOLDER ACCOUNTS. THE REMAINDER
    OF THE 12B-1 FEE, IF ANY, IS AN ASSET-BASED SALES CHARGE, AND IS A
    DISTRIBUTION FEE PAID TO THE DISTRIBUTOR TO COMPENSATE IT FOR THE SERVICES
    PROVIDED AND THE EXPENSES BORNE BY THE DISTRIBUTOR AND OTHERS IN THE
    DISTRIBUTION OF THE FUND'S SHARES (SEE "PURCHASE OF FUND SHARES--PLAN OF
    DISTRIBUTION").
 
(6) UPON CONVERSION OF CLASS B SHARES TO CLASS A SHARES, SUCH SHARES WILL BE
    SUBJECT TO THE LOWER 12B-1 FEE APPLICABLE TO CLASS A SHARES. NO SALES CHARGE
    IS IMPOSED AT THE TIME OF CONVERSION OF CLASS B SHARES TO CLASS A SHARES.
    CLASS C SHARES DO NOT HAVE A CONVERSION FEATURE AND, THEREFORE, ARE SUBJECT
    TO AN ONGOING 0.75% DISTRIBUTION FEE (SEE "PURCHASE OF FUND
    SHARES--ALTERNATIVE PURCHASE ARRANGEMENTS").
 
(7) THERE WERE NO OUTSTANDING SHARES OF CLASS A, CLASS B OR CLASS D PRIOR TO
    JULY 28, 1997. ACCORDINGLY, "TOTAL FUND OPERATING EXPENSES," AS SHOWN ABOVE
    WITH RESPECT TO THOSE CLASSES, ARE ESTIMATES BASED UPON THE SUM OF 12B-1
    FEES, MANAGEMENT FEES AND ESTIMATED "OTHER EXPENSES."
 
<TABLE>
<CAPTION>
EXAMPLES                                                                      1 YEAR       3 YEARS      5 YEARS     10 YEARS
                                                                            -----------  -----------  -----------  -----------
<S>                                                                         <C>          <C>          <C>          <C>
You would pay the following expenses on a $1,000 investment assuming (1) a
 5% annual return and (2) redemption at the end of each time period:
    Class A...............................................................   $      57    $      88    $     121    $     215
    Class B...............................................................   $      70    $      93    $     128    $     234
    Class C...............................................................   $      30    $      63    $     108    $     234
    Class D...............................................................   $      13    $      40    $      69    $     152
 
You would pay the following expenses on the same $1,000 investment
 assuming no redemption at the end of the period:
    Class A...............................................................   $      57    $      88    $     121    $     215
    Class B...............................................................   $      20    $      63    $     108    $     234
    Class C...............................................................   $      20    $      63    $     108    $     234
    Class D...............................................................   $      13    $      40    $      69    $     152
</TABLE>
 
    THE ABOVE EXAMPLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR
FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF EACH CLASS MAY BE GREATER OR
LESS THAN THOSE SHOWN.
 
    The purpose of this table is to assist the investor in understanding the
various costs and expenses that an investor in the Fund will bear directly or
indirectly. For a more complete description of these costs and expenses, see
"The Fund and its Management," "Purchase of Fund Shares--Plan of Distribution"
and "Repurchases and Redemptions" in this Prospectus.
 
    Long-term shareholders of Class B and Class C may pay more in sales charges,
including distribution fees, than the economic equivalent of the maximum
front-end sales charges permitted by the NASD.
 
                                       5
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
    The  following ratios and per share data  for a share of beneficial interest
outstanding throughout each period  have been audited  by Price Waterhouse  LLP,
independent  accountants. The financial highlights should be read in conjunction
with the financial statements  and notes thereto and  the unqualified report  of
independent  accountants,  which are  contained in  the Statement  of Additional
Information. Further information about the performance of the Fund is  contained
in  the  Fund's Annual  Report to  Shareholders, which  may be  obtained without
charge upon request to the Fund.
 
<TABLE>
<CAPTION>
                                                                                                      FOR THE PERIOD
                                                                                                        MARCH 31,
                                                                                                          1993*
                                                      FOR THE YEAR ENDED JANUARY 31,                     THROUGH
                                          -------------------------------------------------------      JANUARY 31,
                                           1998**++         1997           1996           1995             1994
                                          ----------     ----------     ----------     ----------     --------------
<S>                                       <C>            <C>            <C>            <C>            <C>
CLASS C SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period....  $    11.42     $    11.13     $     9.77     $    10.98         $   10.00
                                          ----------     ----------     ----------     ----------           -------
Net investment income...................        0.57           0.60           0.59           0.59              0.45
Net realized and unrealized gain
 (loss).................................        0.96           0.84           1.37          (1.20)             1.02
                                          ----------     ----------     ----------     ----------           -------
Total from investment operations........        1.53           1.44           1.96          (0.61)             1.47
                                          ----------     ----------     ----------     ----------           -------
Less dividends and distributions from:
  Net investment income.................       (0.60)         (0.60)         (0.60)         (0.55)            (0.39)
  Net realized gain.....................       (0.74)         (0.55)            --          (0.05)            (0.10)
                                          ----------     ----------     ----------     ----------           -------
Total dividends and distributions.......       (1.34)         (1.15)         (0.60)         (0.60)            (0.49)
                                          ----------     ----------     ----------     ----------           -------
Net asset value, end of period..........  $    11.61     $    11.42     $    11.13     $     9.77         $   10.98
                                          ----------     ----------     ----------     ----------           -------
                                          ----------     ----------     ----------     ----------           -------
TOTAL INVESTMENT RETURN+................      14.03%         13.46%         20.52%        (5.59)%            15.06%(1)
 
RATIOS TO AVERAGE NET ASSETS:
Expenses................................       2.01%          2.02%          2.21%          2.04%             1.57%(2)(3)
Net investment income...................       4.84%          5.19%          5.41%          5.83%             5.62%(2)(3)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in
 thousands..............................     $54,863        $60,941        $57,631        $55,335           $64,370
Portfolio turnover rate.................         96%           102%            79%            88%               84%(1)
Average commission rate paid............     $0.0169        $0.0540             --             --                --
</TABLE>
 
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 *  COMMENCEMENT OF OPERATIONS.
**  PRIOR TO JULY 28, 1997, THE  FUND ISSUED ONE CLASS OF SHARES. ALL SHARES  OF
    THE  FUND HELD PRIOR TO THAT DATE,  OTHER THAN SHARES WHICH WERE ACQUIRED IN
    EXCHANGE FOR SHARES  OF FUNDS FOR  WHICH DEAN WITTER  SERVICES COMPANY  INC.
    SERVES  AS MANAGER AND TCW FUNDS MANAGEMENT, INC. SERVES AS ADVISER ("TCW/DW
    FUNDS") OFFERED WITH A CONTINGENT DEFERRED SALES CHARGE ("CDSC") AND  SHARES
    ACQUIRED  THROUGH REINVESTMENT OF DIVIDENDS  AND DISTRIBUTIONS THEREON, HAVE
    BEEN DESIGNATED CLASS  C SHARES. SHARES  HELD PRIOR TO  JULY 28, 1997  WHICH
    WERE  ACQUIRED IN  EXCHANGE FOR SHARES  OF A  TCW/DW FUND SOLD  WITH A CDSC,
    INCLUDING  SHARES   ACQUIRED   THROUGH   REINVESTMENT   OF   DIVIDENDS   AND
    DISTRIBUTIONS THEREON, HAVE BEEN DESIGNATED CLASS B SHARES.
 ++   THE  PER SHARE  AMOUNTS WERE  COMPUTED USING  AN AVERAGE  NUMBER OF SHARES
    OUTSTANDING DURING THE PERIOD.
 +  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)  IF THE MANAGER AND  INVESTMENT ADVISER HAD NOT  REIMBURSED ALL EXPENSES AND
    WAIVED THE MANAGEMENT FEE, THE  ABOVE ANNUALIZED EXPENSE AND NET  INVESTMENT
    INCOME RATIOS WOULD HAVE BEEN 2.00% AND 5.18%, RESPECTIVELY.
 
                                       6
<PAGE>
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<TABLE>
<CAPTION>
                                                                FOR THE PERIOD
                                                                JULY 28, 1997*
                                                                   THROUGH
                                                                 JANUARY 31,
                                                                    1998++
                                                                --------------
<S>                                                             <C>
CLASS A SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period........................        $   11.81
                                                                       ------
Net investment income.......................................             0.31
Net realized and unrealized gain............................             0.38
                                                                       ------
Total from investment operations............................             0.69
                                                                       ------
Less dividends and distributions from:
  Net investment income.....................................            (0.33)
  Net realized gain.........................................            (0.57)
                                                                       ------
Total dividends and distributions...........................            (0.90)
                                                                       ------
Net asset value, end of period..............................        $   11.60
                                                                       ------
                                                                       ------
TOTAL INVESTMENT RETURN+....................................             6.03%(1)
 
RATIOS TO AVERAGE NET ASSETS:
Expenses....................................................             1.54%(2)
Net investment income.......................................             5.04%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands.....................              $28
Portfolio turnover rate.....................................               96%
Average commission rate paid................................          $0.0169
 
CLASS B SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period........................        $   11.81
                                                                       ------
Net investment income.......................................             0.28
Net realized and unrealized gain............................             0.38
                                                                       ------
Total from investment operations............................             0.66
                                                                       ------
 
Less dividends and distributions from:
  Net investment income.....................................            (0.30)
  Net realized gain.........................................            (0.57)
                                                                       ------
Total dividends and distributions...........................            (0.87)
                                                                       ------
Net asset value, end of period..............................        $   11.60
                                                                       ------
                                                                       ------
TOTAL INVESTMENT RETURN+....................................             5.80%(1)
 
RATIOS TO AVERAGE NET ASSETS:
Expenses....................................................             2.02%(2)
Net investment income.......................................             4.58%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands.....................           $6,597
Portfolio turnover rate.....................................               96%
Average commission rate paid................................          $0.0169
</TABLE>
 
- ------------
 *   THE DATE THE SHARES WERE FIRST ISSUED. CLASS B PARTICIPANTS WHO HELD SHARES
    PRIOR TO JULY 28, 1997 SHOULD REFER  TO THE FINANCIAL HIGHLIGHTS OF CLASS  C
    TO OBTAIN THE HISTORICAL PER SHARE AND RATIO INFORMATION OF THEIR SHARES.
 ++   THE  PER SHARE  AMOUNTS WERE  COMPUTED USING  AN AVERAGE  NUMBER OF SHARES
    OUTSTANDING DURING THE PERIOD.
 +  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.
 
                                       7
<PAGE>
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<TABLE>
<CAPTION>
                                                                FOR THE PERIOD
                                                                JULY 28, 1997*
                                                                   THROUGH
                                                                 JANUARY 31,
                                                                    1998++
                                                                --------------
<S>                                                             <C>
CLASS D SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period........................        $   11.81
                                                                       ------
Net investment income.......................................             0.32
Net realized and unrealized gain............................             0.39
                                                                       ------
Total from investment operations............................             0.71
                                                                       ------
Less dividends and distributions from:
  Net investment income.....................................            (0.34)
  Net realized gain.........................................            (0.57)
                                                                       ------
Total dividends and distributions...........................            (0.91)
                                                                       ------
Net asset value, end of period..............................        $   11.61
                                                                       ------
                                                                       ------
TOTAL INVESTMENT RETURN+....................................             6.21%(1)
 
RATIOS TO AVERAGE NET ASSETS:
Expenses....................................................             1.27%(2)
Net investment income.......................................             5.33%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands.....................              $11
Portfolio turnover rate.....................................               96%
Average commission rate paid................................          $0.0169
</TABLE>
 
- ------------
 *  THE DATE THE SHARES WERE FIRST ISSUED.
 ++   THE  PER SHARE  AMOUNTS WERE  COMPUTED USING  AN AVERAGE  NUMBER OF SHARES
    OUTSTANDING DURING THE PERIOD.
 +  CALCULATED BASED ON THE NET ASSET  VALUE AS OF THE LAST BUSINESS DAY OF  THE
    PERIOD.
(1) NOT ANNUALIZED.
(2) ANNUALIZED.
 
                                       8
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
TCW/DW Income and Growth Fund (the "Fund") is an open-end, non-diversified
management investment company. The Fund is a trust of the type commonly known as
a "Massachusetts business trust" and was organized under the laws of
Massachusetts on November 23, 1992.
 
    Dean Witter Services Company Inc. (the "Manager"), whose address is Two
World Trade Center, New York, New York 10048, is the Fund's Manager. The Manager
is a wholly-owned subsidiary of Dean Witter InterCapital Inc. ("InterCapital").
InterCapital 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.
 
    The Manager acts as manager to ten other TCW/DW Funds. The Manager and
InterCapital act in various investment management, advisory, management and
administrative capacities to a total of 101 investment companies, 28 of which
are listed on the New York Stock Exchange, with combined assets of approximately
$105.8 billion as of February 28, 1998. InterCapital also manages and advises
portfolios of pension plans, other institutions and individuals which aggregated
approximately $4.1 billion at such date.
 
    The Fund has retained the Manager to manage its business affairs, supervise
its overall day-to-day operations (other than providing investment advice) and
provide all administrative services.
 
    TCW Funds Management, Inc. (the "Adviser"), whose address is 865 South
Figueroa Street, Suite 1800, Los Angeles, California 90017, is the Fund's
investment adviser. The Adviser was organized in 1987 as a wholly-owned
subsidiary of The TCW Group, Inc. ("TCW"), whose subsidiaries, including Trust
Company of the West and TCW Asset Management Company, provide a variety of
trust, investment management and investment advisory services. Robert A. Day,
who is Chairman of the Board of Directors of TCW, may be deemed to be a control
person of the Adviser by virtue of the aggregate ownership by Mr. Day and his
family of more than 25% of the outstanding voting stock of The TCW Group, Inc.
The Adviser serves as investment adviser to ten other TCW/DW Funds in addition
to the Fund. As of February 28, 1998, the Adviser and its affiliated companies
had over $50 billion under management or committed to management, primarily from
institutional investors.
 
    The Fund has retained the Adviser to invest the Fund's assets.
 
    The Fund's Trustees review the various services provided by the Manager and
the Adviser to ensure that the Fund's general investment policies and programs
are being properly carried out and that administrative services are being
provided to the Fund in a satisfactory manner.
 
    As full compensation for the services and facilities furnished to the Fund
and for expenses of the Fund assumed by the Manager, the Fund pays the Manager
monthly compensation calculated daily by applying the annual rate of 0.45% to
the Fund's net assets up to $500 million, scaled down to 0.42% on assets over
$500 million. As compensation for its investment advisory services, the Fund
pays the Adviser monthly compensation calculated daily by applying an annual
rate of 0.30% to the Fund's net assets up to $500 million, scaled down to 0.28%
on assets over $500 million. For the fiscal year ended January 31, 1998, the
Fund accrued total compensation to the Manager and the Adviser amounting to
0.45% and 0.30%, respectively, of the Fund's average daily net assets and total
expenses of Class C amounted to 2.01% of the average daily net assets of Class
C. Shares of Class A, Class B and Class D were first issued on July 28, 1997.
The expenses of the Fund include: the fees of the Manager and the Adviser; the
fee pursuant to the Plan of Distribution (see "Purchase of Fund Shares"); taxes;
transfer agent, custodian and auditing fees; certain legal fees; and printing
and other expenses relating to the Fund's operations which are not expressly
assumed by the Manager or the Adviser under their respective Agreements with the
Fund.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The investment objective of the Fund is to generate high total return by
providing a high level of current income and the potential for capital
appreciation. This objective is fundamental and may not be changed without
shareholder approval. There is no assurance that the objective will be achieved.
 
    The Fund seeks to achieve its investment objective by investing, in
descending order of preference under current market conditions, at least 65% of
its total assets in any or all of the following types of securities: (1) bonds
or preferred stock convertible into common stock ("convertible securities"); (2)
other fixed-income securities, including bonds, notes, debentures and preferred
stocks; (3) common stocks; and (4) U.S. Government securities (securities issued
or guaranteed by the United States or its agencies or instrumentalities).
 
    The Fund will invest at least 50% of its total assets in a combination of
equity securities and fixed-income securities with equity components such as
convertible securities and warrants. In addition, all fixed-income securities
without an
 
                                       9
<PAGE>
equity component in which the Fund invests will have a weighted average life or
a maturity date of ten years or less.
 
    The Fund may invest in convertible securities and other fixed-income
securities rated below investment grade. Securities below investment grade are
the equivalent of high yield, high risk bonds. Investment grade is generally
considered to be debt securities rated BBB or higher by Standard & Poor's
Corporation ("S&P") or Baa or higher by Moody's Investors Service, Inc.
("Moody's"). (Convertible and other fixed-income securities rated BBB by S&P or
Baa by Moody's, which generally are regarded as having an adequate capacity to
pay interest and repay principal, have speculative characteristics.) However,
the Fund will only invest in convertible and other fixed-income securities that
are rated at least B by either S&P or Moody's or, if not rated, determined to be
of comparable quality by the Adviser. The Fund will not invest in fixed-income
securities that are in default in payment of principal or interest. A
description of fixed-income securities ratings is contained in the Appendix to
this Prospectus.
 
PORTFOLIO CHARACTERISTICS
 
    CONVERTIBLE SECURITIES.  A convertible security is a bond, debenture, note,
preferred stock or other security that may be converted into or exchanged for a
prescribed amount of common stock of the same or a different issuer within a
particular period of time at a specified price or based on a specified formula.
Convertible securities rank senior to common stocks in a corporation's capital
structure and, therefore, entail less risk than the corporation's common stock.
The value of a convertible security is a function of its "investment value" (its
value as if it did not have a conversion privilege), and its "conversion value"
(the security's worth if it were to be exchanged for the underlying security, at
market value, pursuant to its conversion privilege).
 
    To the extent that a convertible security's investment value is greater than
its conversion value, its price will be primarily a reflection of such
investment value and its price will be likely to increase when interest rates
fall and decrease when interest rates rise, as with a fixed-income security (the
credit standing of the issuer and other factors may also have an effect on the
convertible security's value). If the conversion value exceeds the investment
value, the price of the convertible security will rise above its investment
value and, in addition, may sell at some premium over its conversion value.
(This premium represents the price investors are willing to pay for the
privilege of purchasing a fixed-income security with a possibility of capital
appreciation due to the conversion privilege.) At such times the price of the
convertible security will tend to fluctuate directly with the price of the
underlying equity security.
 
    FOREIGN SECURITIES.  The Fund may invest in securities of foreign companies.
The Fund may invest in Eurodollar convertible securities, which are fixed-income
securities of a U.S. or foreign issuer that are issued in U.S. dollars outside
the United States and are convertible into or exchangeable for equity securities
of the same or a different issuer. Interest and dividends on Eurodollar
securities are payable in U.S. dollars outside of the United States. The Fund
may invest without limitation in Eurodollar convertible securities that are
convertible into or exchangeable for U.S. or foreign equity securities listed,
or represented by American Depository Receipts listed, on a U.S. stock exchange.
The Fund's investments in other Eurodollar convertible securities which are
exchangeable for unlisted foreign equity securities are subject to the Fund's
overall policy limiting its investment in illiquid securities to 15% or less of
its net assets.
 
    The Fund will not invest more than 25% of the value of its total assets, at
the time of purchase, in non-dollar denominated foreign securities (other than
securities of Canadian issuers registered under the Securities Exchange Act of
1934 or American Depository Receipts, on which there is no such limit). The
Fund's investments in unlisted foreign securities are subject to the Fund's
overall policy limiting its investment in illiquid securities to 15% or less of
its net assets. Foreign securities investments may be affected by changes in
currency rates or exchange control regulations, changes in governmental
administration or economic or monetary policy (in the United States and abroad)
or changed circumstances in dealings between nations. Costs may be incurred in
connection with conversions between various currencies held by the Fund. The
Fund currently does not intend to invest more than 25% of its total assets in
the securities of issuers in any one country outside the United States. For a
discussion of the risks of foreign securities, see "Risk Considerations," below.
 
RISK CONSIDERATIONS
 
The net asset value of the Fund's shares will fluctuate with changes in the
market value of the Fund's portfolio securities. The market value of the Fund's
portfolio securities will increase or decrease due to a variety of economic,
market and political factors affecting the creditworthiness of the underlying
issuers, as well as changes in prevailing interest rates, none of which can be
predicted. A decline in prevailing interest rates will generally increase the
value of fixed-income securities, while an increase in rates usually reduces the
value of those securities. The Fund's yield also will vary based on the yield of
the Fund's portfolio securities.
 
    HIGH YIELD, HIGH RISK SECURITIES.  Because of the ability of the Fund to
invest in certain high yield, high risk convertible and fixed-income securities,
the Adviser must take into account the special nature of such securities and
certain special considerations in assessing the risks associated with such
investments. Although the growth of the high yield securities market in the
1980s had paralleled a long economic expansion, recently many issuers have been
affected by adverse economic and market conditions. It should be recognized that
an economic downturn or increase in interest rates is likely to have a negative
effect on the high yield bond market and on the value of the high yield
securities held by the Fund, as well as on the ability of the securities'
issuers to repay principal and interest on their borrowings.
 
                                       10
<PAGE>
    The prices of high yield securities have been found to be less sensitive to
changes in prevailing interest rates than higher-rated investments, but are
likely to be more sensitive to adverse economic changes or individual corporate
developments. During an economic downturn or substantial period of rising
interest rates, highly leveraged issuers may experience financial stress which
would adversely affect their ability to service their principal and interest
payment obligations, to meet their projected business goals or to obtain
additional financing. If the issuer of a fixed-income security owned by the Fund
defaults, the Fund may incur additional expenses to seek recovery. In addition,
periods of economic uncertainty and change can be expected to result in an
increased volatility of market prices of high yield securities and a concomitant
volatility in the net asset value of a share of the Fund.
 
    The secondary market for high yield securities may be less liquid than the
markets for higher quality securities and, as such, may have an adverse effect
on the market prices of certain securities. The limited liquidity of the market
may also adversely affect the ability of the Fund's Trustees to arrive at a fair
value for certain high yield securities at certain times and could make it
difficult for the Fund to sell certain securities. In addition, new laws and
potential new laws may have an adverse effect upon the value of high yield
securities and a concomitant negative impact upon the net asset value of a share
of the Fund.
 
    For a discussion of the risks of the Fund's status as a non-diversified
investment company, see "Other Investment Policies," below. For a discussion of
warrants and stock rights, see "Warrants and Stock Rights," below. For a
discussion of the risks of options and futures transactions, see "Options and
Futures Transactions," below.
 
    During the fiscal year ended January 31, 1998, the monthly dollar weighted
average ratings of the debt obligations held by the Fund, expressed as a
percentage of the Fund's total debt investments, were as follows:
 
<TABLE>
<CAPTION>
                                            PERCENTAGE OF
                RATINGS                   TOTAL INVESTMENTS
- ----------------------------------------  -----------------
<S>                                       <C>
AAA/Aaa.................................            2.0%
AA/Aa...................................            1.9%
A/A.....................................            8.4%
BBB/Baa.................................            7.8%
BB/Ba...................................           15.2%
B/B.....................................           37.8%
CCC/Caa.................................            0.0%
CC/Ca...................................            0.0%
C/C.....................................            0.0%
D.......................................            0.0%
Unrated.................................           26.9%
</TABLE>
 
    FOREIGN SECURITIES.  Foreign securities investments may be affected by
changes in currency rates or exchange control regulations, changes in
governmental administration or economic or monetary policy (in the United States
and abroad) or changed circumstances in dealings between nations. Fluctuations
in the relative rates of exchange between the currencies of different nations
will affect the value of the Fund's investments denominated in foreign currency.
Changes in foreign currency exchange rates relative to the U.S. dollar will
affect the U.S. dollar value of the Fund's assets denominated in that currency
and thereby impact upon the Fund's total return on such assets.
 
    Foreign currency exchange rates are determined by forces of supply and
demand on the foreign exchange markets. These forces are themselves affected by
the international balance of payments and other economic and financial
conditions, government intervention, speculation and other factors. Moreover,
foreign currency exchange rates may be affected by the regulatory control of the
exchanges on which the currencies trade.
 
    Investments in foreign securities will also occasion risks relating to
political and economic developments abroad, including the possibility of
expropriations or confiscatory taxation, limitations on the use or transfer of
Fund assets and any effects of foreign social, economic or political
instability. Foreign companies are not subject to the regulatory requirements of
U.S. companies and, as such, there may be less publicly available information
about such companies. Moreover, foreign companies are not subject to uniform
accounting, auditing and financial reporting standards and requirements
comparable to those applicable to U.S. companies.
 
    Securities of foreign issuers may be less liquid than comparable securities
of U.S. issuers and, as such, their price changes may be more volatile.
Furthermore, foreign exchanges and broker-dealers are generally subject to less
government and exchange scrutiny and regulation than their American
counterparts. Brokerage commissions, dealer concessions and other transaction
costs may be higher on foreign markets than in the U.S. In addition, differences
in clearance and settlement procedures on foreign markets may occasion delays in
settlements of the Fund's trades effected in such markets. As such, the
inability to dispose of portfolio securities due to settlement delays could
result in losses to the Fund due to subsequent declines in value of such
securities and the inability of the Fund to make intended security purchases due
to settlement problems could result in a failure of the Fund to make potentially
advantageous investments. To the extent the Fund purchases Eurodollar
certificates of deposit issued by foreign branches of domestic United States
banks, consideration will be given to their domestic marketability, the lower
reserve requirements normally mandated for overseas banking operations, the
possible impact of interruptions in the flow of international currency
transactions and future international political and economic developments which
might adversely affect the payment of principal or interest.
 
                                       11
<PAGE>
    The risks of other investment techniques which may be utilized by the Fund
are described under "Other Investment Policies" and "Options and Futures
Transactions" below.
 
WARRANTS AND STOCK RIGHTS
 
The Fund may invest up to 5% of the value of its net assets in warrants,
including not more than 2% in warrants not listed on either the New York or
American Stock Exchange. The Fund may also invest up to 5% of the value of its
net assets in stock rights. Warrants are, in effect, an option to purchase
equity securities at a specific price, generally valid for a specific period of
time, and have no voting rights, pay no dividends and have no rights with
respect to the corporations issuing them. The Fund may acquire warrants and
stock rights attached to other securities without reference to the foregoing
limitations.
 
OTHER INVESTMENT POLICIES
 
While the Fund invests primarily in the types of securities described above,
under ordinary circumstances it may invest up to 35% of its total assets in
money market instruments, which are short-term (maturities of up to thirteen
months) fixed-income securities issued by private and governmental institutions.
Money market instruments in which the Fund may invest are securities issued or
guaranteed by the U.S. Government or its agencies; obligations of banks subject
to regulation by the U.S. Government and having total assets of $1 billion or
more; Eurodollar certificates of deposit; obligations of savings banks and
savings and loan associations having total assets of $1 billion or more; fully
insured certificates of deposit; and commercial paper rated within the two
highest grades by Moody's or S&P or, if not rated, issued by a company having an
outstanding debt issue rated AAA by S&P or Aaa by Moody's.
 
    There may be periods during which, in the opinion of the Adviser, market
conditions warrant reduction of some or all of the Fund's securities holdings.
During such periods, the Fund may adopt a temporary "defensive" posture in which
greater than 35% of its total assets is invested in money market instruments or
cash.
 
    The Fund is classified as a non-diversified investment company under the
Investment Company Act of 1940, as amended (the "Act"), and, as such, is not
limited by the Act in the proportion of its assets that it may invest in the
obligations of a single issuer. However, the Fund intends to conduct its
operations so as to qualify as a "regulated investment company" under Subchapter
M of the Internal Revenue Code. See "Dividends, Distributions and Taxes." In
order to qualify, among other requirements, the Fund will limit its investments
so that at the close of each quarter of the taxable year, (i) not more than 25%
of the market value of the Fund's total assets will be invested in the
securities of a single issuer, and (ii) with respect to 50% of the market value
of its total assets not more than 5% will be invested in the securities of a
single issuer and the Fund will not own more than 10% of the outstanding voting
securities of a single issuer. To the extent that a relatively high percentage
of the Fund's assets may be invested in the obligations of a limited number of
issuers, the Fund's portfolio securities may be more susceptible to any single
economic, political or regulatory occurrence than the portfolio securities of a
diversified investment company. The limitations described in this paragraph are
not fundamental policies and may be revised to the extent applicable Federal
income tax requirements are revised.
 
    REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which
may be viewed as a type of secured lending by the Fund, and which 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 at a specified price and at
a fixed time in the future, usually not more than seven days from the date of
purchase. While repurchase agreements involve certain risks not associated with
direct investments in debt securities, including the risks of default or
bankruptcy of the selling financial institution, the Fund follows procedures
designed to minimize those risks. These procedures include effecting repurchase
transactions only with large, well-capitalized and well-established financial
institutions and maintaining adequate collateralization.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From
time to time, in the ordinary course of business, 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 such 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 the commitment. There is no overall
limit on the percentage of the Fund's assets which may be committed to the
purchase of securities on a when-issued, delayed delivery or forward commitment
basis. 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 the Fund's net asset value.
 
    WHEN, AS AND IF ISSUED SECURITIES.  The Fund may purchase securities on a
"when, as and if issued" basis under which the issuance of the security depends
upon the occurrence of a subsequent event, such as approval of a merger,
corporate reorganization, leveraged buyout or debt restructuring. If the
anticipated event does not occur and the securities are not issued, the Fund
will have lost an investment opportunity. There is no overall limit on the
percentage of the Fund's assets which may be committed to the purchase of
securities on a "when, as and if issued" basis. An increase in the percentage of
the Fund's assets committed to the purchase of securities on a "when, as and if
issued" basis may increase the volatility of its net asset value. The Fund may
also sell securities on a "when, as and if issued" basis provided that the
issuance of the security will result automatically from the
 
                                       12
<PAGE>
exchange or conversion of a security owned by the Fund at the time of the sale.
 
    PRIVATE PLACEMENTS.  The Fund may invest up to 5% of its total assets in
securities which are subject to restrictions on resale because they have not
been registered under the Securities Act of 1933, as amended (the "Securities
Act"), or which are otherwise not readily marketable. (Securities eligible for
resale pursuant to Rule 144A under the Securities Act, and determined to be
liquid pursuant to the procedures discussed in the following paragraph, are not
subject to the foregoing restriction.) These securities are generally referred
to as private placements or restricted securities. Limitations on the resale of
such securities may have an adverse effect on their marketability, and may
prevent the Fund from disposing of them promptly at reasonable prices. The Fund
may have to bear the expense of registering such securities for resale and the
risk of substantial delays in effecting such registration.
 
    The Securities and Exchange Commission has adopted Rule 144A under the
Securities Act, which permits the Fund to sell restricted securities to
qualified institutional buyers without limitation. The Adviser, pursuant to
procedures adopted by the Trustees of the Fund, will make a determination as to
the liquidity of each restricted security purchased by the Fund. If a restricted
security is determined to be "liquid," such security will not be included within
the category "illiquid securities," which under current policy may not exceed
15% of the Fund's net assets. However, investing in Rule 144A securities could
have the effect of increasing the level of Fund illiquidity to the extent the
Fund, at a particular period in time, may be unable to find qualified
institutional buyers in purchasing such securities.
 
    INVESTMENT IN OTHER INVESTMENT VEHICLES.  Under the Investment Company Act
of 1940, as amended, the Fund generally may invest up to 10% of its total assets
in the aggregate in shares of other investment companies and up to 5% of its
total assets in any one investment company. The Fund may not own more than 3% of
the voting stock of any investment company. In addition, the Fund may invest in
real estate investment trusts, which pool investors' funds for investments
primarily in commercial real estate properties. Investment in other investment
companies may be the sole or most practical means by which the Fund may
participate in certain securities markets, and investment in real estate
investment trusts may be the most practical available means for the Fund to
invest in the real estate industry (the Fund is prohibited from investing in
real estate directly). As a shareholder in an investment company or real estate
investment trust, the Fund would bear its ratable share of that entity's
expenses, including its advisory and administration fees. At the same time the
Fund would continue to pay its own investment management fees and other
expenses, as a result of which the Fund and its shareholders in effect will be
absorbing duplicate levels of fees with respect to investments in other
investment companies and in real estate investment trusts.
 
    ZERO COUPON SECURITIES.  A portion of the fixed-income securities purchased
by the Fund may be zero coupon securities. Such securities are purchased at a
discount from their face amount, giving the purchaser the right to receive their
full value at maturity. The interest earned on such securities is, implicitly,
automatically compounded and paid out at maturity. While such compounding at a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest if prevailing interest rates decline, the owner of a zero coupon
security will be unable to participate in higher yields upon reinvestment of
interest received on interest-paying securities if prevailing interest rates
rise.
 
    A zero coupon security pays no interest to its holder during its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash available for distribution to shareholders. In addition,
zero coupon securities are subject to substantially greater price fluctuations
during periods of changing prevailing interest rates than are comparable
securities which pay interest on a current basis. Current federal tax law
requires that a holder (such as the Fund) of a zero coupon security accrue a
portion of the discount at which the security was purchased as income each year
even though the Fund receives no interest payments in cash on the security
during the year.
 
OPTIONS AND FUTURES TRANSACTIONS
 
The Fund may purchase and sell (write) call and put options on portfolio
securities and on the U.S. dollar which are or may in the future be listed on
securities exchanges or are written in over-the-counter transactions ("OTC
Options"). Listed options are issued or guaranteed by the exchange on which they
trade or by a clearing corporation such as the Options Clearing Corporation. OTC
options are purchased from or sold (written) to dealers or financial
institutions which have entered into direct agreements with the Fund. The Fund
is permitted to write covered call options on portfolio securities and the U.S.
dollar, without limit, in order to aid it in achieving its investment objective.
The Fund may also write covered put options; however, the aggregate value of the
obligations underlying the puts determined as of the date the options are sold
will not exceed 50% of the Fund's net assets.
 
    The Fund may purchase listed and OTC call and put options on securities and
stock indexes in amounts equalling up to 5% of its total assets. The Fund may
purchase call options to close out a covered call position or to protect against
an increase in the price of a security it anticipates purchasing. The Fund may
purchase put options on securities which it holds in its portfolio only to
protect itself against a decline in the value of the security. The Fund may also
purchase put options to close out written put positions in a manner similar to
call option closing purchase transactions. There are no other limits on the
Fund's ability to purchase call and put options.
 
    The Fund may also purchase and sell interest rate and stock index futures
contracts ("futures contracts") that are
 
                                       13
<PAGE>
traded on U.S. commodity exchanges on such underlying securities as U.S.
Treasury bonds, notes, and bills and GNMA Certificates ("interest rate" futures)
and such indexes as the S&P 500 Index and the New York Stock Exchange Composite
Index ("stock index" futures) and the Moody's Investment-Grade Corporation Bond
Index ("bond index" futures). The Fund will purchase or sell interest rate
futures contracts and bond index futures contracts for the purpose of hedging
its fixed-income portfolio (or anticipated portfolio) against changes in
prevailing interest rates and to alter the Fund's asset allocation in
fixed-income securities. The Fund will purchase or sell stock index futures
contracts for the purpose of hedging its equity portfolio (or anticipated
portfolio) against changes in their prices.
 
    The Fund also may purchase and write call and put options on futures
contracts which are traded on an exchange and enter into closing transactions
with respect to such options to terminate an existing position.
 
    New futures contracts, options and other financial products and various
combinations thereof continue to be developed. The Fund may invest in any such
futures, options or products as may be developed, to the extent consistent with
its investment objective and applicable regulatory requirements.
 
    RISKS OF OPTIONS AND FUTURES TRANSACTIONS.  The Fund may close out its
position as writer of an option, or as a buyer or seller of a futures contract,
only if a liquid secondary market exists for options or futures contracts of
that series. There is no assurance that such a market will exist, particularly
in the case of OTC options, as such options may generally only be closed out by
entering into a closing purchase transaction with the purchasing dealer. Also,
exchanges may limit the amount by which the price of many futures contracts 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.
 
    While the futures contracts and options transactions to be engaged in by the
Fund for the purpose of hedging the Fund's portfolio securities are not
speculative in nature, there are risks inherent in the use of such instruments.
One such risk is that the Adviser could be incorrect in its expectations as to
the direction or extent of various interest rate or price movements or the time
span within which the movements take place. For example, if the Fund sold
futures contracts for the sale of securities in anticipation of an increase in
interest rates, and then interest rates went down instead, causing bond prices
to rise, the Fund would lose money on the sale. Another risk which will arise in
employing futures contracts to protect against the price volatility of portfolio
securities is that the prices of securities, currencies and indexes subject to
futures contracts (and thereby the futures contract prices) may correlate
imperfectly with the behavior of the dollar cash prices of the Fund's portfolio
securities and their denominated currencies. See the Statement of Additional
Information for a further discussion of such risks.
 
    YEAR 2000.  The management services provided to the Fund by the Manager, the
investment advisory services provided to the Fund by the Adviser 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 Manager, the Adviser, 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.
 
PORTFOLIO MANAGEMENT
 
The Fund's portfolio is actively managed by its Adviser with a view to achieving
the Fund's investment objective. Robert M. Hanisee, Mark Attanasio, Kevin A.
Hunter and Melissa Weiler, Managing Directors of the Adviser, are the primary
portfolio managers of the Fund. Messrs. Hanisee and Hunter and Ms. Weiler have
been primary portfolio managers of the Fund since April, 1995 and Mr. Attanasio
has been a portfolio manager of the Fund since March, 1996. Messrs. Hanisee and
Hunter have been portfolio managers with affiliates of The TCW Group, Inc. for
over five years. Mr. Attanasio has been a portfolio manager with the TCW Group
Inc. and affiliates thereof since April, 1995. Prior thereto he was Co-Chief
Executive Officer and Chief Portfolio Strategist of Crescent Corporation (April,
1991-April 1995). Ms. Weiler has been a portfolio manager with affiliates of The
TCW Group, Inc. since April, 1995, and prior thereto was a Vice President and
Portfolio Manager of Crescent Capital Corporation, an Investment Adviser, with
which she had been affiliated since February 1992.
 
    In determining which securities to purchase for the Fund or hold in the
Fund's portfolio, the Adviser will rely on information from various sources,
including research, analysis and appraisals of brokers and dealers, including
Dean Witter Reynolds Inc. ("DWR"), Morgan Stanley & Co.
 
                                       14
<PAGE>
Incorporated and other broker-dealer affiliates of the Manager, and others
regarding economic developments and interest rate trends, and the Adviser's own
analysis of factors it deems relevant.
 
    Orders for transactions in portfolio securities and commodities are placed
for the Fund with a number of brokers and dealers, including DWR, Morgan Stanley
& Co. Incorporated and other brokers and dealers that are affiliates of the
Manager or Adviser. The Fund may incur brokerage commissions on transactions
conducted through such affiliates. Under normal circumstances it is not
anticipated that the portfolio trading will result in the Fund's portfolio
turnover rate exceeding 150% in any one year. The Fund will incur brokerage
costs commensurate with its portfolio turnover rate, and thus, a higher level
(over 100%) of portfolio transactions will increase the Fund's overall brokerage
expenses. Short term gains and losses may result from such portfolio
transactions.
 
    Except as specifically noted, all investment policies and practices
discussed above are not fundamental policies of the Fund and, as such, may be
changed without shareholder approval.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
The investment restrictions listed below are among the restrictions which have
been adopted by the Fund as fundamental policies. Under the Act, a fundamental
policy may not be changed without the vote of a majority of the outstanding
voting securities of the Fund, as defined in the Act. For purposes of the
following limitations: (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 may not:
 
        1.  Invest 25% or more 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.
 
        2.  Invest more than 5% of the value of its total assets in securities
    of issuers having a record, together with predecessors, of less than three
    years of continuous operation. This restriction does not apply to
    obligations issued or guaranteed by the United States Government, its
    agencies or instrumentalities.
 
    In addition, as a non-fundamental policy, the Fund may not, as to 75% of its
total assets, purchase more than 10% of the voting securities of any issuer.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
GENERAL
 
The Fund offers each class of its shares for sale to the public on a continuous
basis. Pursuant to a Distribution Agreement between the Fund and Dean Witter
Distributors Inc. (the "Distributor"), an affiliate of the Manager, shares of
the Fund are distributed by the Distributor and offered by DWR and others (which
may include TCW Brokerage Services, an affiliate of the Adviser) who have
entered into agreements with the Distributor ("Selected Broker-Dealers"). The
principal executive office of the Distributor is located at Two World Trade
Center, New York, New York 10048.
 
    The Fund offers four classes of shares (each, a "Class"). Class A shares are
sold to investors with an initial sales charge that declines to zero for larger
purchases; however, Class A shares sold without an initial sales charge are
subject to a contingent deferred sales charge ("CDSC") of 1.0% if redeemed
within one year of purchase, except for certain specific circumstances. Class B
shares are sold without an initial sales charge but are subject to a CDSC
(scaled down from 5.0% to 1.0%) payable upon most redemptions within six years
after purchase. (Class B shares purchased by certain qualified plans are subject
to a CDSC scaled down from 2.0% to 1.0% if redeemed within three years after
purchase.) Class C shares are sold without an initial sales charge but are
subject to a CDSC of 1.0% on most redemptions made within one year after
purchase. Class D shares are sold without an initial sales charge or CDSC and
are available only to investors meeting an initial investment minimum of $5
million ($25 million for certain qualified plans), and to certain other limited
categories of investors. At the discretion of the Board of Trustees of the Fund,
Class A shares may be sold to categories of investors in addition to those set
forth in this prospectus at net asset value without a front-end sales charge,
and Class D shares may be sold to certain other categories of investors, in each
case as may be described in the then current prospectus of the Fund. See
"Alternative Purchase Arrangements--Selecting a Particular Class" for a
discussion of factors to consider in selecting which Class of shares to
purchase.
 
                                       15
<PAGE>
    The minimum initial purchase is $1,000 for each Class of shares, although
Class D shares are only available to persons investing $5 million ($25 million
for certain qualified plans) or more and to certain other limited categories of
investors. For the purpose of meeting the minimum $5 million (or $25 million)
initial investment for Class D shares, and subject to the $1,000 minimum initial
investment for each Class of the Fund, an investor's existing holdings of Class
A shares and concurrent investments in Class D shares of the Fund and other
TCW/DW Funds which are multiple class funds ("TCW/DW Multi-Class Funds") will be
aggregated. Subsequent purchases of $100 or more may be made by sending a check,
payable to TCW/DW Income and Growth Fund, directly to Morgan Stanley Dean Witter
Trust FSB (the "Transfer Agent" or "MSDW Trust") at P.O. Box 1040, Jersey City,
NJ 07303, or by contacting an account executive of DWR or another Selected
Broker-Dealer. When purchasing shares of the Fund, investors must specify
whether the purchase is for Class A, Class B, Class C or Class D shares. If no
Class is specified, the Transfer Agent will not process the transaction until
the proper Class is identified. The minimum initial purchase in the case of
investments through EasyInvest-SM-, an automatic purchase plan (see "Shareholder
Services"), is $100, provided that the schedule of automatic investments will
result in investments totalling at least $1,000 within the first twelve months.
The minimum initial investment in the case of an "Education IRA" is $500, if the
Distributor has reason to believe that additional investments will increase the
investment in the account to $1,000 within three years. In the case of
investments pursuant to (i) Systematic Payroll Deduction Plans (including
Individual Retirement Plans), (ii) the InterCapital mutual fund asset allocation
program and (iii) fee-based programs approved by the Distributor, pursuant to
which participants pay an asset based fee for services in the nature of
investment advisory, administrative and/or brokerage services, the Fund, in its
discretion, may accept investments without regard to any minimum amounts which
would otherwise be required, provided, in the case of Systematic Payroll
Deduction Plans, that the Distributor has reason to believe that additional
investments will increase the investment in all accounts under such Plans to at
least $1,000. Certificates for shares purchased will not be issued unless a
request is made by the shareholder in writing to the Transfer Agent.
 
    Shares of the Fund are sold through the Distributor on a normal three
business day settlement basis; that is, payment is due on the third business day
(settlement date) after the order is placed with the Distributor. Since DWR and
other Selected Broker-Dealers forward investors' funds on settlement date, they
will benefit from the temporary use of the funds if payment is made prior
thereto. As noted above, orders placed directly with the Transfer Agent must be
accompanied by payment. Investors will be entitled to receive income dividends
and capital gains distributions if their order is received by the close of
business on the day prior to the record date for such dividends and
distributions.
 
    Sales personnel of a Selected Broker-Dealer are compensated for selling
shares of the Fund by the Distributor or any of its affiliates and/or the
Selected Broker-Dealer. In addition, some sales personnel of the Selected
Broker-Dealer will receive various types of non-cash compensation as special
sales incentives, including trips, educational and/or business seminars and
merchandise. The Fund and the Distributor reserve the right to reject any
purchase orders.
 
ALTERNATIVE PURCHASE ARRANGEMENTS
 
The Fund offers several Classes of shares to investors designed to provide them
with the flexibility of selecting an investment best suited to their needs. The
general public is offered three Classes of shares: Class A shares, Class B
shares and Class C shares, which differ principally in terms of sales charges
and rate of expenses to which they are subject. A fourth Class of shares, Class
D shares, is offered only to limited categories of investors (see "No Load
Alternative-- Class D Shares" below).
 
    Each Class A, Class B, Class C or Class D share of the Fund represents an
identical interest in the investment portfolio of the Fund except that Class A,
Class B and Class C shares bear the expenses of the ongoing shareholder service
fees, Class B and Class C shares bear the expenses of the ongoing distribution
fees and Class A, Class B and Class C shares which are redeemed subject to a
CDSC bear the expense of the additional incremental distribution costs resulting
from the CDSC applicable to shares of those Classes. The ongoing distribution
fees that are imposed on Class A, Class B and Class C shares will be imposed
directly against those Classes and not against all assets of the Fund and,
accordingly, such charges against one Class will not affect the net asset value
of any other Class or have any impact on investors choosing another sales charge
option. See "Plan of Distribution" and "Repurchases and Redemptions."
 
    Set forth below is a summary of the differences between the Classes and the
factors an investor should consider when selecting a particular Class. This
summary is qualified in its entirety by detailed discussion of each Class that
follows this summary.
 
    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 certain
purchases. Investments of $1 million or more (and investments by certain other
limited categories of investors) are not subject to any sales charges at the
time of purchase but are subject to a CDSC of 1.0% on redemptions made within
one year after purchase, except for certain specific circumstances. Class A
shares are also subject to a 12b-1 fee of up to 0.25% of the average daily net
assets of the Class. See "Initial Sales Charge Alternative--Class A Shares."
 
    CLASS B SHARES.  Class B shares are offered at net asset value with no
initial sales charge but are subject to a CDSC (scaled down from 5.0% to 1.0%)
if redeemed within six years of purchase. (Class B shares purchased by certain
qualified
 
                                       16
<PAGE>
plans are subject to a CDSC scaled down from 2.0% to 1.0% if redeemed within
three years after purchase.) This CDSC may be waived for certain redemptions.
Class B shares are also subject to an annual 12b-1 fee of 0.75% of the average
daily net assets of Class B. The Class B shares' distribution fee will cause
that Class to have higher expenses and pay lower dividends than Class A or Class
D shares.
 
    After approximately ten (10) years, Class B shares will convert
automatically to Class A shares of the Fund, based on the relative net asset
values of the shares of the two Classes on the conversion date. In addition, a
certain portion of Class B shares that have been acquired through the
reinvestment of dividends and distributions will be converted at that time. See
"Contingent Deferred Sales Charge Alternative-- Class B Shares."
 
    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 redemptions made within one
year after purchase. This CDSC may be waived for certain redemptions. They are
subject to an annual 12b-1 fee of up to 0.75% of the average daily net assets of
the Class C shares. 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. See
"Level Load Alternative--Class C Shares."
 
    CLASS D SHARES.  Class D shares are available only to limited categories of
investors (see "No Load Alternative-- Class D Shares" below). Class D shares are
sold at net asset value with no initial sales charge or CDSC. They are not
subject to any 12b-1 fees. See "No Load Alternative-- Class D Shares."
 
    SELECTING A PARTICULAR CLASS.  In deciding which Class of Fund shares to
purchase, investors should consider the following factors, as well as any other
relevant facts and circumstances:
 
    The decision as to which Class of shares is more beneficial to an investor
depends on the amount and intended length of his or her investment. Investors
who prefer an initial sales charge alternative may elect to purchase Class A
shares. Investors qualifying for significantly reduced or, in the case of
purchases of $1 million or more, no initial sales charges may find Class A
shares particularly attractive because similar sales charge reductions are not
available with respect to Class B or Class C shares. Moreover, Class A shares
are subject to lower ongoing expenses than are Class B or Class C shares over
the term of the investment. As an alternative, Class B and Class C shares are
sold without any initial sales charge so the entire purchase price is
immediately invested in the Fund. Any investment return on these additional
investment amounts may partially or wholly offset the higher annual expenses of
these Classes. Because the Fund's future return cannot be predicted, however,
there can be no assurance that this would be the case.
 
    Finally, investors should consider the effect of the CDSC period and any
conversion rights of the Classes in the context of their own investment time
frame. For example, although Class C shares are subject to a significantly lower
CDSC upon redemptions, they do not, unlike Class B shares, convert into Class A
shares after approximately ten years, and, therefore, are subject to an ongoing
12b-1 fee of 0.75% (rather than the 0.25% fee applicable to Class A shares) for
an indefinite period of time. Thus, Class B shares may be more attractive than
Class C shares to investors with longer term investment outlooks. Other
investors, however, may elect to purchase Class C shares if, for example, they
determine that they do not wish to be subject to a front-end sales charge and
they are uncertain as to the length of time they intend to hold their shares.
 
    For the purpose of meeting the $5 million (or $25 million) minimum
investment amount for Class D shares, holdings of Class A shares in all TCW/DW
Multi-Class Funds, and holdings of shares of "Exchange Funds" (see "Shareholder
Services--Exchange Privilege") for which Class A shares have been exchanged,
will be included together with the current investment amount.
 
    Sales personnel may receive different compensation for selling each Class of
shares. Investors should understand that the purpose of a CDSC is the same as
that of the initial sales charge in that the sales charges applicable to each
Class provide for the financing of the distribution of shares of that Class.
 
    Set forth below is a chart comparing the sales charge, 12b-1 fees and
conversion options applicable to each Class of shares:
 
<TABLE>
<CAPTION>
                                                     CONVERSION
  CLASS           SALES CHARGE          12b-1 FEE      FEATURE
<C>        <S>                          <C>        <C>
    A      Maximum 4.25% initial sales    0.25%          No
           charge reduced for
           purchases of $25,000 and
           over; shares sold without
           an initial sales charge
           generally subject to a 1.0%
           CDSC during first year.
    B      Maximum 5.0% CDSC during       0.75%    B shares
           the first year decreasing               convert to A
           to 0 after six years                    shares
                                                   automatically
                                                   after
                                                   approximately
                                                   ten years
    C      1.0% CDSC during first year    0.75%          No
    D                 None                None           No
</TABLE>
 
    See "Purchase of Fund Shares" and "The Fund and its Management" for a
complete description of the sales charges and service and distribution fees for
each Class of shares and "Determination of Net Asset Value," "Dividends,
Distributions and Taxes" and "Shareholder Services--Exchange Privilege" for
other differences between the Classes of shares.
 
                                       17
<PAGE>
INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES
 
Class A shares are sold at net asset value plus an initial sales charge. In some
cases, reduced sales charges may be available, as described below. Investments
of $1 million or more (and investments by certain other limited categories of
investors) are not subject to any sales charges at the time of purchase but are
subject to a CDSC of 1.0% on redemptions made within one year after purchase
(calculated from the last day of the month in which the shares were purchased),
except for certain specific circumstances. The CDSC will be assessed on an
amount equal to the lesser of the current market value or the cost of the shares
being redeemed. The CDSC will not be imposed (i) in the circumstances set forth
below in the section "Contingent Deferred Sales Charge Alternative--Class B
Shares--CDSC Waivers," except that the references to six years in the first
paragraph of that section shall mean one year in the case of Class A shares, and
(ii) in the circumstances identified in the section "Additional Net Asset Value
Purchase Options" below. Class A shares are also subject to an annual 12b-1 fee
of up to 0.25% of the average daily net assets of the Class.
 
    The offering price of Class A shares will be the net asset value per share
next determined following receipt of an order (see "Determination of Net Asset
Value" below), plus a sales charge (expressed as a percentage of the offering
price) on a single transaction as shown in the following table:
 
<TABLE>
<CAPTION>
                                     SALES CHARGE
                          -----------------------------------
                           PERCENTAGE OF       APPROXIMATE
       AMOUNT OF          PUBLIC OFFERING     PERCENTAGE OF
   SINGLE TRANSACTION          PRICE         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>
 
    Upon notice to all Selected Broker-Dealers, the Distributor may reallow up
to the full applicable sales charge as shown in the above schedule 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 of 1933.
 
    The above schedule of sales charges is applicable to purchases in a single
transaction by, among others: (a) an individual; (b) an individual, his or her
spouse and their children under the age of 21 purchasing shares for his, her or
their own accounts; (c) a trustee or other fiduciary purchasing shares for a
single trust estate or a single fiduciary account; (d) a pension, profit-sharing
or other employee benefit plan qualified or non-qualified under Section 401 of
the Internal Revenue Code; (e) tax-exempt organizations enumerated in Section
501(c)(3) or (13) of the Internal Revenue Code; (f) employee benefit plans
qualified under Section 401 of the Internal Revenue Code of a single employer or
of employers who are "affiliated persons" of each other within the meaning of
Section 2(a)(3)(c) of the Act; and for investments in Individual Retirement
Accounts of employees of a single employer through Systematic Payroll Deduction
plans; or (g) any other organized group of persons, whether incorporated or not,
provided the organization has been in existence for at least six months and has
some purpose other than the purchase of redeemable securities of a registered
investment company at a discount.
 
    COMBINED PURCHASE PRIVILEGE.  Investors may have the benefit of reduced
sales charges in accordance with the above schedule by combining purchases of
Class A shares of the Fund in single transactions with the purchase of Class A
shares of other TCW/DW Multi-Class Funds. The sales charge payable on the
purchase of the Class A shares of the Fund and the Class A shares of the other
TCW/DW Multi-Class Funds will be at their respective rates applicable to the
total amount of the combined concurrent purchases of such shares.
 
    RIGHT OF ACCUMULATION.  The above persons and entities may benefit from a
reduction of the sales charges in accordance with the above schedule if the
cumulative net asset value of Class A shares purchased in a single transaction,
together with shares of the Fund and other TCW/DW Multi-Class Funds previously
purchased at a price including a front-end sales charge (including shares of the
Fund, other TCW/DW Multi-Class Funds or "Exchange Funds" (see "Shareholder
Services--Exchange Privilege") acquired in exchange for those shares, and
including in each case shares acquired through reinvestment of dividends and
distributions), which are held at the time of such transaction, amounts to
$25,000 or more. If such investor has a cumulative net asset value of Class A
and Class D shares that, together with the current investment amount, is equal
to at least $5 million ($25 million for certain qualified plans), such investor
is eligible to purchase Class D shares subject to the $1,000 minimum initial
investment requirement of that Class of the Fund. See "No Load
Alternative--Class D Shares" below.
 
    The Distributor must be notified by DWR or a Selected Broker-Dealer or the
shareholder at the time a purchase order is placed that the purchase qualifies
for the reduced charge under the Right of Accumulation. Similar notification
must be made in writing by the dealer or shareholder when such an order is
placed by mail. The reduced sales charge will not be granted if: (a) such
notification is not furnished at the time of the order; or (b) a review of the
records of the Selected Broker-Dealer or the Transfer Agent fails to confirm the
investor's represented holdings.
 
    LETTER OF INTENT.  The foregoing schedule of reduced sales charges will also
be available to investors who enter into
 
                                       18
<PAGE>
a written Letter of Intent providing for the purchase, within a thirteen-month
period, of Class A shares of the Fund from DWR or other Selected Broker-Dealers.
The cost of Class A shares of the Fund or Class A shares of other TCW/DW
Multi-Class Funds which were previously purchased at a price including a
front-end sales charge during the 90-day period prior to the date of receipt by
the Distributor of the Letter of Intent, or of Class A shares of the Fund or
other TCW/DW Multi-Class Funds or shares of "Exchange Funds" (see "Shareholder
Services -- Exchange Privilege") acquired in exchange for Class A shares of such
funds purchased during such period at a price including a front-end sales
charge, which are still owned by the shareholder, may also be included in
determining the applicable reduction.
 
    ADDITIONAL NET ASSET VALUE PURCHASE OPTIONS.  In addition to investments of
$1 million or more, Class A shares also may be purchased at net asset value by
the following:
 
        (1) trusts for which MSDW Trust (an affiliate of the Manager) provides
    discretionary trustee services;
 
        (2) persons participating in a fee-based program approved by the
    Distributor, pursuant to which such persons pay an asset based fee for
    services in the nature of investment advisory or administrative services
    (such investments are subject to all of the terms and conditions of such
    programs, which may include termination fees, mandatory redemption upon
    termination and such other circumstances as specified in the programs'
    agreements, and restrictions on transferability of Fund shares);
 
        (3) employer-sponsored 401(k) and other plans qualified under Section
    401(a) of the Internal Revenue Code ("Qualified Retirement Plans") with at
    least 200 eligible employees and for which MSDW Trust serves as Trustee or
    DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
    Recordkeeping Services Agreement;
 
        (4) Qualified Retirement Plans for which MSDW Trust serves as Trustee or
    DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
    Recordkeeping Services Agreement;
 
        (5) investors who are clients of a Dean Witter account executive who
    joined Dean Witter from another investment firm within six months prior to
    the date of purchase of Fund shares by such investors, if the shares are
    being purchased with the proceeds from a redemption of shares of an open-end
    proprietary mutual fund of the account executive's previous firm which
    imposed either a front-end or deferred sales charge, provided such purchase
    was made within sixty days after the redemption and the proceeds of the
    redemption had been maintained in the interim in cash or a money market
    fund; and
 
        (6) other categories of investors, at the discretion of the Board, as
    disclosed in the then current prospectus of the Fund.
 
    No CDSC will be imposed on redemptions of shares purchased pursuant to
paragraphs (1), (2) or (5), above.
 
    For further information concerning purchases of the Fund's shares, contact
DWR or another Selected Broker-Dealer or consult the Statement of Additional
Information.
 
CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE--
CLASS B SHARES
 
Class B shares are sold at net asset value next determined without an initial
sales charge so that the full amount of an investor's purchase payment may be
immediately invested in the Fund. A CDSC, however, will be imposed on most Class
B shares redeemed within six years after purchase. The CDSC will be imposed on
any redemption of shares if after such redemption the aggregate current value of
a Class B account with the Fund falls below the aggregate amount of the
investor's purchase payments for Class B shares made during the six years (or,
in the case of shares held by certain Qualified Retirement Plans, three years)
preceding the redemption. In addition, Class B shares are subject to an annual
12b-1 fee of 0.75% of the average daily net assets of Class B.
 
    Except as noted below, Class B shares of the Fund which are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased) will not be subject to any CDSC upon redemption.
Shares redeemed earlier than six years after purchase may, however, be subject
to a CDSC which will be a percentage of the dollar amount of shares redeemed and
will be assessed on an amount equal to the lesser of the current market value or
the cost of the shares being redeemed. The size of this percentage will depend
upon how long the shares have been held, as set forth in the following table:
 
<TABLE>
<CAPTION>
             YEAR SINCE                CDSC AS A PERCENTAGE
        PURCHASE PAYMENT MADE           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>
 
    In the case of Class B shares purchased on or after July 28, 1997 by
Qualified Retirement Plans for which MSDW Trust serves as Trustee or DWR's
Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement, shares held for three years or more after
purchase (calculated as described in the paragraph above) will not be subject to
any CDSC upon redemption. However, shares redeemed earlier than three years
after purchase may be subject to a CDSC (calculated as described in the
paragraph above), the percentage of which will depend on
 
                                       19
<PAGE>
how long the shares have been held, as set forth in the following table:
 
<TABLE>
<CAPTION>
             YEAR SINCE                CDSC AS A PERCENTAGE
        PURCHASE PAYMENT MADE           OF AMOUNT REDEEMED
- -------------------------------------  ---------------------
<S>                                    <C>
First................................             2.0%
Second...............................             2.0%
Third................................             1.0%
Fourth and thereafter................             None
</TABLE>
 
    CDSC WAIVERS.  A CDSC will not be imposed on: (i) any amount which
represents an increase in value of shares purchased within the six years (or, in
the case of shares held by certain Qualified Retirement Plans, three years)
preceding the redemption; (ii) the current net asset value of shares purchased
more than six years (or, in the case of shares held by certain
employer-sponsored benefit plans, three years) prior to the redemption; and
(iii) the current net asset value of shares purchased through reinvestment of
dividends or distributions. Moreover, in determining whether a CDSC is
applicable it will be assumed that amounts described in (i), (ii) and (iii)
above (in that order) are redeemed first.
 
    In addition, the CDSC, if otherwise applicable, will be waived in the case
of:
 
        (1) redemptions of shares held at the time a shareholder dies or becomes
    disabled, only if the shares are: (a) registered either in the name of an
    individual shareholder (not a trust), or in the names of such shareholder
    and his or her spouse as joint tenants with right of survivorship; or  (b)
    held in a qualified corporate or self-employed retirement plan, Individual
    Retirement Account ("IRA") or Custodial Account under Section 403(b)(7) of
    the Internal Revenue Code ("403(b) Custodial Account"), provided in either
    case that the redemption is requested within one year of the death or
    initial determination of disability;
 
        (2) redemptions in connection with the following retirement plan
    distributions:  (a) 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);  (b) distributions from an IRA or 403(b) Custodial Account
    following attainment of age 59 1/2; or  (c) a tax-free return of an excess
    contribution to an IRA; and
 
        (3) all redemptions of shares held for the benefit of a participant in a
    Qualified Retirement Plan which offers investment companies managed by the
    Manager or its parent, Dean Witter InterCapital Inc., as self-directed
    investment alternatives and for which MSDW Trust serves as Trustee or DWR's
    Retirement Plan Services serves as recordkeeper pursuant to a written
    Recordkeeping Services Agreement ("Eligible Plan"), provided that either:
     (a) the plan continues to be an Eligible Plan after the redemption; or  (b)
    the redemption is in connection with the complete termination of the plan
    involving the distribution of all plan assets to participants.
 
    With reference to (1) above, for the purpose of determining disability, the
Distributor utilizes the definition of disability contained in Section 72(m)(7)
of the Internal Revenue Code, which relates to the inability to engage in
gainful employment. With reference to (2) above, the term "distribution" does
not encompass a direct transfer of IRA, 403(b) Custodial Account or retirement
plan assets to a successor custodian or trustee. All waivers will be granted
only following receipt by the Distributor of confirmation of the shareholder's
entitlement.
 
    CONVERSION TO CLASS A SHARES.  Shares of the Fund held prior to July 28,
1997 which were acquired in exchange for shares of TCW/DW Funds sold with a
CDSC, including shares acquired through reinvestment of dividends and
distributions thereon, have been designated Class B shares. Shares held before
May 1, 1997 that have been designated Class B shares will convert to Class A
shares in May, 2007. In all other instances Class B shares will convert
automatically to Class A shares, based on the relative net asset values of the
shares of the two Classes on the conversion date, which will be approximately
ten (10) years after the date of the original purchase. The ten year period is
calculated 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 or a series of
exchanges, from the last day of the month in which the original Class B shares
were purchased, provided that shares originally purchased before May 1, 1997
will convert to Class A shares in May, 2007. The conversion of shares purchased
on or after May 1, 1997 will take place in the month following the tenth
anniversary of the purchase. There will also be converted at that time such
proportion of Class B shares acquired through automatic reinvestment of
dividends and distributions owned by the shareholder as the total number of his
or her Class B shares converting at the time bears to the total number of
outstanding Class B shares purchased and owned by the shareholder. In the case
of Class B shares held by a Qualified Retirement Plan for which MSDW Trust
serves as Trustee or DWR's Retirement Plan Services serves as recordkeeper
pursuant to a written Recordkeeping Services Agreement, 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 first shares of a TCW/DW Multi-Class Fund purchased by
that plan. In the case of Class B shares previously exchanged for shares of an
"Exchange Fund" (see "Shareholder Services--Exchange Privilege"), the period of
time the shares were held in the Exchange Fund (calculated from the last day of
the month in which the Exchange Fund shares were acquired) is excluded from the
holding period for conversion. If those shares are subsequently re-exchanged for
Class B shares of a TCW/DW Multi-Class Fund, the holding period resumes on the
last day of the month in which Class B shares are reacquired.
 
    If a shareholder has received share certificates for Class B shares, such
certificates must be delivered to the
 
                                       20
<PAGE>
Transfer Agent at least one week prior to the date for conversion. Class B
shares evidenced by share certificates that are not received by the Transfer
Agent at least one week prior to any conversion date will be converted into
Class A shares on the next scheduled conversion date after such certificates are
received.
 
    Effectiveness of the conversion feature is subject to the continuing
availability of a ruling of the Internal Revenue Service or an opinion of
counsel that (i) the conversion of shares does not constitute a taxable event
under the Internal Revenue Code, (ii) Class A shares received on conversion will
have a basis equal to the shareholder's basis in the converted Class B shares
immediately prior to the conversion, and (iii) Class A shares received on
conversion will have a holding period that includes the holding period of the
converted Class B shares. The conversion feature may be suspended if the ruling
or opinion is no longer available. In such event, Class B shares would continue
to be subject to Class B 12b-1 fees.
 
LEVEL LOAD ALTERNATIVE--CLASS C SHARES
 
Class C shares are sold at net asset value next determined without an initial
sales charge but are subject to a CDSC of 1.0% on most redemptions made within
one year after purchase (calculated from the last day of the month in which the
shares were purchased). The CDSC will be assessed on an amount equal to the
lesser of the current market value or the cost of the shares being redeemed. The
CDSC will not be imposed in the circumstances set forth above in the section
"Contingent Deferred Sales Charge Alternative--Class B Shares--CDSC Waivers,"
except that the references to six years in the first paragraph of that section
shall mean one year in the case of Class C shares. Class C shares are subject to
an annual 12b-1 fee of up to 0.75% of the average daily net assets of the Class.
Unlike Class B shares, Class C shares have no conversion feature and,
accordingly, an investor that purchases Class C shares will be subject to 12b-1
fees applicable to Class C shares for an indefinite period subject to annual
approval by the Fund's Board of Trustees and regulatory limitations. All shares
of the Fund held prior to July 28, 1997 (other than shares which were acquired
in exchange for shares of TCW/DW Funds sold with a CDSC and shares acquired
through reinvestment of dividends and distributions thereon) have been
designated Class C shares. Shares held before July 28, 1997 that have been
designated Class C shares are not subject to the 1.0% CDSC.
 
NO LOAD ALTERNATIVE--CLASS D SHARES
 
Class D shares are offered without any sales charge on purchase or redemption
and without any 12b-1 fee. Class D shares are offered only to investors meeting
an initial investment minimum of $5 million ($25 million for Qualified
Retirement Plans for which MSDW Trust serves as Trustee or DWR's Retirement Plan
Services serves as recordkeeper pursuant to a written Recordkeeping Services
Agreement) and the following categories of investors: (i) investors
participating in the InterCapital mutual fund asset allocation program pursuant
to which such persons pay an asset based fee; (ii) persons participating in a
fee-based program approved by the Distributor, pursuant to which such persons
pay an asset based fee for services in the nature of investment advisory or
administrative services (subject to all of the terms and conditions of such
programs referred to in (i) and (ii) above, which may include termination fees,
mandatory redemption upon termination and such other circumstances as specified
in the programs' agreements, and restrictions on transferability of Fund
shares); (iii) certain Unit Investment Trusts sponsored by DWR; (iv) certain
other open-end investment companies whose shares are distributed by the
Distributor; and (v) other categories of investors, at the discretion of the
Board, as disclosed in the then current prospectus of the Fund. Investors who
require a $5 million (or $25 million) minimum initial investment to qualify to
purchase Class D shares may satisfy that requirement by investing that amount in
a single transaction in Class D shares of the Fund and other TCW/DW Multi-Class
Funds, subject to the $1,000 minimum initial investment required for that Class
of the Fund. In addition, for the purpose of meeting the $5 million (or $25
million) minimum investment amount, holdings of Class A shares in all TCW/DW
Multi-Class Funds, and holdings of shares of "Exchange Funds" (see "Shareholder
Services--Exchange Privilege") for which Class A shares have been exchanged,
will be included together with the current investment amount. If a shareholder
redeems Class A shares and purchases Class D shares, such redemption may be a
taxable event.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the Act
with respect to the distribution of Class A, Class B and Class C shares of the
Fund. In the case of Class A and Class C shares, the Plan provides that the Fund
will reimburse the Distributor and others for the expenses of certain activities
and services incurred by them specifically on behalf of those shares.
Reimbursements for these expenses will be made in monthly payments by the Fund
to the Distributor, which will in no event exceed amounts equal to payments at
the annual rates of 0.25% and 0.75% of the average daily net assets of Class A
and Class C, respectively. In the case of Class B shares, the Plan provides that
the Fund will pay the Distributor a fee, which is accrued daily and paid
monthly, at the annual rate of 0.75% of the average daily net assets of Class B.
The fee is treated by the Fund as an expense in the year it is accrued. In the
case of Class A shares, the entire amount of the fee currently represents a
service fee within the meaning of the NASD guidelines. In the case of Class B
and Class C shares, a portion of the fee payable pursuant to the Plan, equal to
0.20% and 0.25% of the average daily net assets of each of these Classes,
respectively, is currently characterized as a service fee. A service fee is a
payment made for personal service and/or the maintenance of shareholder
accounts.
 
                                       21
<PAGE>
    Additional amounts paid under the Plan in the case of Class B and Class C
shares are paid to the Distributor for services provided and the expenses borne
by the Distributor and others in the distribution of the shares of those
Classes, including the payment of commissions for sales of the shares of those
Classes and incentive compensation to and expenses of DWR's account executives
and others who engage in or support distribution of shares or who service
shareholder accounts, including overhead and telephone expenses; printing and
distribution of prospectuses and reports used in connection with the offering of
the Fund's shares to other than current shareholders; and 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 DWR 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.
 
    For the fiscal year ended January 31, 1998, Class C shares of the Fund
accrued payments under the Plan amounting to $437,111, which amount is equal to
0.75% of the average daily net assets of Class C for the fiscal year. All shares
held prior to July 28, 1997 (other than shares which were acquired in exchange
for shares of TCW/DW Fund sold with a CDSC, including shares acquired through
reinvestment of dividends and distributions thereon which have been designated
Class B shares) have been designated Class C shares. For the fiscal period July
28, 1997 through January 31, 1998, the Class A and Class B shares of the Fund
accrued payments under the Plan amounting to $23 and $21,976, respectively,
which amounts on an annualized basis are equal to 0.25% and 0.75% of the average
daily net assets of Class A and Class B, respectively, for such period.
 
    In the case of Class B shares, at any given time, the expenses in
distributing Class B shares of the Fund may be in excess of the total of (i) the
payments made by the Fund pursuant to the Plan, and (ii) the proceeds of CDSCs
paid by investors upon the redemption of Class B 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 such
excess amounts, including the carrying charge described above totalled $55,344
for Class B at January 31, 1998 which was equal to 0.84% 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 or any requirement that
the Plan be continued from year to year, such 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.
 
    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 0.75% 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 account executives 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
account executives at the time of sale totalled $8,405 in the case of Class C at
December 31, 1997, which amount was equal to 0.02% of the net assets of Class C
on such dates, and that there were no such expenses which may be reimbursed in
the subsequent year in the Class A and Class C 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.
 
DETERMINATION OF NET ASSET VALUE
 
The net asset value per share is determined once daily at 4:00 p.m., New York
time (or, on days when the New York Stock Exchange closes prior to 4:00 p.m., at
such earlier time), on each day that the New York Stock Exchange is open by
taking the net assets of the Fund, dividing by the number of shares outstanding
and adjusting to the nearest cent. The assets belonging to the Class A, Class B,
Class C and Class D shares will be invested together in a single portfolio. The
net asset value of each Class, however, will be determined separately by
subtracting each Class's accrued expenses and liabilities. The net asset value
per share will not be determined on Good Friday and on such other federal and
non-federal holidays as are observed by the New York Stock Exchange.
 
    In the calculation of the Fund's net asset value: (1) an equity portfolio
security listed or traded on the New York or American Stock Exchange or other
stock exchange is valued at its latest sale price on that exchange prior to the
time when assets are valued; if there were no sales that day, the security is
valued at the latest bid price (in cases where securities are traded on more
than one exchange, the securities are valued on the exchange designated as the
primary market pursuant to procedures adopted by the Trustees); and (2) all
other 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. When market quotations are not readily available, including
circumstances under which it is determined by the Adviser 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. For
valuation purposes, quotations of foreign portfolio securities are translated
into U.S. dollar equivalents at the prevailing market rates prior to the close
of the New York Stock Exchange. Dividends receivable are accrued as of the
ex-dividend date or as of the time
 
                                       22
<PAGE>
that the relevant ex-dividend date and amounts become known.
 
    Short-term debt securities with remaining maturities of 60 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 and 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.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS.  All income dividends
and capital gains distributions are automatically paid in full and fractional
shares of the applicable Class of the Fund (or, if specified by the shareholder,
in shares of any other open-end TCW/DW Fund), unless the shareholder requests
that they be paid in cash. Shares so acquired are acquired at net asset value
and are not subject to the imposition of a front-end sales charge or a CDSC (see
"Repurchases and Redemptions").
 
    INVESTMENT OF DIVIDENDS OR DISTRIBUTIONS RECEIVED IN CASH. Any shareholder
who receives a cash payment representing a dividend or capital gains
distribution may invest such dividend or distribution in shares of the
applicable Class at the net asset value per share next determined after receipt
by the Transfer Agent, by returning the check or the proceeds to the Transfer
Agent within 30 days after the payment date. Shares so acquired are acquired at
net asset value and are not subject to the imposition of a front-end sales
charge or a CDSC (see "Repurchases and Redemptions").
 
    EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic
purchase plan which provides for any amount from $100 to $5,000 to be
transferred automatically from a checking or savings account or following
redemption of shares of a Dean Witter money market fund, on a semi-monthly,
monthly or quarterly basis, to the Transfer Agent for investment in shares of
the Fund (see "Purchase of Fund Shares" and "Repurchases and
Redemptions--Involuntary Redemption").
 
    SYSTEMATIC WITHDRAWAL PLAN.  A systematic withdrawal plan (the "Withdrawal
Plan") is available for shareholders who own or purchase shares of the Fund
having a minimum value of $10,000 based upon the then current net asset value.
The Withdrawal Plan provides for monthly or quarterly (March, June, September
and December) checks in any dollar amount, not less than $25, or in any whole
percentage of the account balance, on an annualized basis. Only shareholders
having accounts in which no share certificates have been issued will be
permitted to enroll in the Withdrawal Plan. Any applicable CDSC will be imposed
on shares redeemed under the Withdrawal Plan (see "Purchase of Fund Shares").
Therefore, any shareholder participating in the Withdrawal Plan will have
sufficient shares redeemed from his or her account so that the proceeds (net of
any applicable CDSC) to the shareholder will be the designated monthly or
quarterly amount. Withdrawal plan payments should not be considered as
dividends, yields or income. If periodic withdrawal plan payments continuously
exceed net investment income and net capital gains, the shareholder's original
investment will be correspondingly reduced and ultimately exhausted. Each
withdrawal constitutes a redemption of shares and any gain or loss realized must
be recognized for federal income tax purposes.
 
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
    TAX SHELTERED RETIREMENT PLANS.  Retirement plans are available for use by
corporations, the self-employed, Individual Retirement Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of such
plans should be on advice of legal counsel or tax adviser.
 
    For further information regarding plan administration, custodial fees and
other details, investors should contact their account executive or the Transfer
Agent.
 
EXCHANGE PRIVILEGE
 
Shares of each Class may be exchanged for shares of the same Class of any other
TCW/DW Multi-Class Fund without the imposition of any exchange fee. Shares may
also be exchanged for shares of TCW/DW North American Government Income Trust
and for shares of five money market funds for which InterCapital serves as
investment manager: Dean Witter Liquid Asset Fund Inc., Dean Witter U.S.
Government Money Market Trust, Dean Witter Tax-Free Daily Income Trust, Dean
Witter California Tax-Free Daily Income Trust and Dean Witter New York Municipal
Money Market Trust (the foregoing six funds are hereinafter collectively
referred to as "Exchange Funds"). Exchanges may be made after the shares of the
Fund acquired by purchase (not by exchange or dividend reinvestment) have been
held for thirty days. There is no waiting period for exchanges of shares
acquired by exchange or dividend reinvestment.
 
    An exchange to another TCW/DW Multi-Class Fund or any Exchange Fund that is
not a money market fund is on the basis of the next calculated net asset value
per share of each
 
                                       23
<PAGE>
fund after the exchange order is received. When exchanging into a money market
fund from the Fund, shares of the Fund are redeemed out of the Fund at their
next calculated net asset value and the proceeds of the redemption are used to
purchase shares of the money market fund at their net asset value determined the
following business day. Subsequent exchanges between any of the money market
funds and any of the TCW/DW Multi-Class Funds or any Exchange Fund that is not a
money market fund can be effected on the same basis.
 
    No CDSC is imposed at the time of any exchange of shares, although any
applicable CDSC will be imposed upon ultimate redemption. During the period of
time the shareholder remains in an Exchange Fund (calculated from the last day
of the month in which the Exchange Fund shares were acquired), the holding
period (for the purpose of determining the rate of the CDSC) is frozen. If those
shares are subsequently re-exchanged for shares of a TCW/DW Multi-Class Fund,
the holding period previously frozen when the first exchange was made resumes on
the last day of the month in which shares of a TCW/DW Multi-Class Fund are
reacquired. Thus, the CDSC is based upon the time (calculated as described
above) the shareholder was invested in shares of a TCW/DW Multi-Class Fund (see
"Purchase of Fund Shares"). In the case of shares exchanged into an Exchange
Fund, upon a redemption of shares which results in a CDSC being imposed, a
credit (not to exceed the amount of the CDSC) will be given in an amount equal
to the Exchange Fund 12b-1 distribution fees which are attributable to those
shares. (Exchange Fund 12b-1 distribution fees are described in the prospectuses
for those funds.)
 
    ADDITIONAL INFORMATION REGARDING EXCHANGES.  Purchases and exchanges should
be made for investment purposes only. A pattern of frequent exchanges may be
deemed by the Manager to be abusive and contrary to the best interests of the
Fund's other shareholders and, at the Manager's discretion, may be limited by
the Fund's refusal to accept additional purchases and/or exchanges from the
investor. Although the Fund does not have any specific definition of what
constitutes a pattern of frequent exchanges, and will consider all relevant
factors in determining whether a particular situation is abusive and contrary to
the best interests of the Fund and its other shareholders, investors should be
aware that the Fund, each of the other TCW/DW Funds and each of the money market
funds may in their discretion limit or otherwise restrict the number of times
this Exchange Privilege may be exercised by any investor. Any such restriction
will be made by the Fund on a prospective basis only, upon notice to the
shareholder not later than ten days following such shareholder's most recent
exchange. Also, the Exchange Privilege may be terminated or revised at any time
by the Fund and/or any of such TCW/DW Funds or money market funds for which
shares of the Fund have been exchanged, upon such notice as may be required by
applicable regulatory agencies. Shareholders maintaining margin accounts with
DWR or another Selected Broker-Dealer are referred to their account executive
regarding restrictions on exchange of shares pledged in the margin account.
 
    The current prospectus for each fund describes its investment objective(s)
and policies, and shareholders should obtain a copy and examine it carefully
before investing. Exchanges are subject to the minimum investment requirement of
each Class of shares and any other conditions imposed by each fund. In the case
of a shareholder holding a share certificate or certificates, no exchanges may
be made until all applicable share certificates have been received by the
Transfer Agent and deposited in the shareholder's account. An exchange will be
treated for federal income tax purposes the same as a repurchase or redemption
of shares, on which the shareholder may realize a capital gain or loss. However,
the ability to deduct capital losses on an exchange may be limited in situations
where there is an exchange of shares within ninety days after the shares are
purchased. The Exchange Privilege is only available in states where an exchange
may legally be made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its account numbers are part of the account information, shareholders may
initiate an exchange of shares of the Fund for shares of any of the funds for
which the Exchange Privilege is available pursuant to this Exchange Privilege by
contacting their DWR or other Selected Broker-Dealer account executive (no
Exchange Privilege Authorization Form is required). Other shareholders (and
those shareholders who are clients of DWR or other Selected Broker-Dealers but
who wish to make exchanges directly by writing or telephoning the Transfer
Agent) must complete and forward to the Transfer Agent an Exchange Privilege
Authorization Form, copies of which may be obtained from the Transfer Agent, to
initiate an exchange. If the Authorization Form is used, exchanges may be made
in writing or by contacting the Transfer Agent at (800) 869-NEWS (toll-free).
The Fund will employ reasonable procedures to confirm that exchange instructions
communicated over the telephone are genuine. The procedures include requiring
various forms of personal identification such as name, mailing address, social
security or other tax identification number and DWR or other Selected
Broker-Dealer account number (if any). Telephone instructions will also be
recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m. and 4:00 p.m., New York time, on any day the New York
Stock Exchange is open. Any shareholder wishing to make an exchange who has
previously filed an Exchange Privilege Authorization Form and who is unable to
reach the Fund by telephone should contact his or her DWR or other Selected
Broker-Dealer account executive, if appropriate, or make a written exchange
request. Shareholders are advised that 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 in the past with
other funds managed by the Manager.
 
    For further information regarding the Exchange Privilege, shareholders
should contact their DWR or other Selected Broker-Dealer account executive or
the Transfer Agent.
 
                                       24
<PAGE>
REPURCHASES AND REDEMPTIONS
- --------------------------------------------------------------------------------
 
    REPURCHASES.  DWR and other Selected Broker-Dealers are authorized to
repurchase shares represented by a share certificate which is delivered to any
of their offices. Shares held in a shareholder's account without a share
certificate may also be repurchased by DWR and other Selected Broker Dealers
upon the telephonic request of the shareholder. The repurchase price is the net
asset value next determined (see "Purchase of Fund Shares") after such
repurchase order is received by DWR or other Selected Broker-Dealer reduced by
any applicable CDSC. The CDSC, if any, will be the only fee imposed by the Fund
or the Distributor. The offer by DWR and other Selected Broker-Dealers to
repurchase shares from shareholders may be suspended by them at any time. In
that event, shareholders may redeem their shares through the Fund's Transfer
Agent as set forth below under "Redemptions."
 
    REDEMPTIONS.  Shares of each Class of the Fund can be redeemed for cash at
any time at net asset value per share next determined, less the amount of any
applicable CDSC in the case of Class A, Class B or Class C shares (see "Purchase
of Fund Shares"). If shares are held in a shareholder's account at the Transfer
Agent without a share certificate, a written request for redemption must be sent
to the Fund's Transfer Agent at P.O. Box 983, Jersey City, NJ 07303. If
certificates are held by the shareholder, the shares may be redeemed by
surrendering the certificates with a written request for redemption, along with
any additional information required by the Transfer Agent.
 
    PAYMENT FOR SHARES REPURCHASED OR REDEEMED.  Payment for shares presented
for repurchase or redemption will be made by check within seven days after
receipt by the Transfer Agent of the certificate and/or written request in good
order. Such payment may be postponed or the right of redemption suspended under
unusual circumstances. If the shares to be redeemed have recently been purchased
by check, payment of the redemption proceeds may be delayed for the minimum time
needed to verify that the check used for investment has been honored (not more
than fifteen days from the time of receipt of the check by the Transfer Agent).
Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their account executive regarding restrictions on
redemption of shares of the Fund pledged in the margin account.
 
    REINSTATEMENT PRIVILEGE.  A shareholder who has had his or her shares
redeemed or repurchased and has not previously exercised this reinstatement
privilege may, within 35 days after the date of the redemption or repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares of the Fund in the same Class from which such shares were redeemed or
repurchased, at their net asset value next determined after a reinstatement
request, together with the proceeds, is received by the Transfer Agent and
receive a pro rata credit for any CDSC paid in connection with such redemption
or repurchase.
 
    INVOLUNTARY REDEMPTION.  The Fund reserves the right, on 60 days' notice, to
redeem, at their net asset value, the shares of any shareholder (other than
shares held in an individual Retirement Account or Custodial Account under
Section 403(b)(7) of the Internal Revenue Code) whose shares due to redemptions
by the shareholder have a value of less than $100 or such lesser amount as may
be fixed by the Trustees or, in the case of an account offered through
EasyInvest, if after twelve months the shareholder has invested less than $1,000
in the account. However, before the Fund redeems such shares and sends the
proceeds to the shareholder, it will notify the shareholder that the value of
the shares is less than the applicable amount and allow the shareholder 60 days
to make an additional investment in an amount which will increase the value of
the account to at least the applicable amount before the redemption is
processed. No CDSC will be imposed on any involuntary redemption.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    DIVIDENDS AND DISTRIBUTIONS.  The Fund declares dividends separately for
each Class of shares and intends to pay quarterly income dividends and to
distribute net short-term and net long-term capital gains, if any, at least once
each year. The Fund may, however, determine either to distribute or to retain
all or part of any net long-term capital gains in any year for reinvestment.
 
    All dividends and any capital gains distributions will be paid in additional
shares of the same Class and automatically credited to the shareholder's account
without issuance of a share certificate unless the shareholder requests in
writing that all dividends and/or distributions be paid in cash. Shares acquired
by dividend and distribution reinvestments will not be subject to any front-end
sales charge or CDSC. Class B shares acquired through dividend and distribution
reinvestments will become eligible for conversion to Class A shares on a pro
rata basis. Distributions paid on Class A and Class D shares will be higher than
for Class B and Class C shares because distribution fees paid by Class B and
Class C shares are higher. (See "Shareholder Services--Automatic Investment of
Dividends and Distributions.")
 
    TAXES.  Because the Fund intends to distribute all of its net investment
income and capital gains to shareholders and otherwise continue to qualify as a
regulated investment company under Subchapter M of the Internal Revenue Code, it
is not expected that the Fund will be required to pay any federal
 
                                       25
<PAGE>
income tax. Shareholders who are required to pay taxes on their income will
normally have to pay federal income taxes, and any state income taxes, on the
dividends and 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. Any dividends declared in the last quarter of any calendar
year which are paid in the following year prior to February 1 will be deemed,
for tax purposes, to have been received by the shareholder in the prior calendar
year.
 
    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. Capital gains distributions are not eligible for
the corporate dividends received deduction.
 
    The Fund may at times make payments from sources other than income or net
capital gains. Payments from such sources would, in effect, represent a return
of a portion of each shareholder's investment. All, or a portion, of such
payments would not be taxable to shareholders.
 
    After the end of the calendar year, shareholders will be sent full
information on their dividends and capital gains distributions for tax purposes.
Shareholders will also be notified of their proportionate share of capital gains
distributions that are eligible for a reduced rate of tax under the Taxpayer
Relief Act of 1997. To avoid being subject to a 31% federal backup withholding
tax on taxable dividends, capital gains distributions and the proceeds of
redemptions and repurchases, shareholders' taxpayer identification numbers must
be furnished and certified as to their accuracy.
 
    Shareholders should consult their tax advisers as to the applicability of
the foregoing to their current situation.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
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. Both the yield and the total
return of the Fund are based on historical earnings and are not intended to
indicate future performance. The yield of each Class of the Fund is computed by
dividing the Class's net investment income over a 30-day period by an average
value (using the average number of shares entitled to receive dividends and the
net asset value per share at the end of the period), all in accordance with
applicable regulatory requirements. Such amount is compounded for six months and
then annualized for a twelve-month period to derive the Fund's yield for each
Class.
 
    The "average annual total return" of the Fund refers to a figure reflecting
the average annualized percentage increase (or decrease) in the value of an
initial investment in a Class of the Fund of $1,000 over periods of one, five
and ten years, as well as over the life of the Fund, if less than any of the
foregoing. Average annual total return reflects all income earned by the Fund,
any appreciation or depreciation of the Fund's assets and all expenses incurred
by the applicable Class and all sales charges, which would be incurred by
shareholders, for the stated periods. It also assumes reinvestment of all
dividends and distributions paid by the Fund.
 
    In addition to the foregoing, the Fund may advertise its total return for
each Class over different periods of time by means of aggregate, average, and
year-by-year or other types of total return figures. Such calculations may or
may not reflect the deduction of any sales charge which, if reflected, would
reduce the performance quoted. 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. The Fund from time to time may also advertise its
performance relative to certain performance rankings and indexes compiled by
independent organizations (such as mutual fund performance rankings of Lipper
Analytical Services, Inc.).
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
    VOTING RIGHTS.  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, as discussed herein, Class A, Class B
and Class C bear the expenses related to the distribution of their respective
shares.
 
    The Fund is not required to hold Annual Meetings of Shareholders and in
ordinary circumstances the Fund does not intend to hold such meetings. Under
certain circumstances the Trustees may be removed by action of the Trustees. The
shareholders also have the right under certain circumstances to remove Trustees.
 
                                       26
<PAGE>
    Under Massachusetts law, shareholders of a business trust may, under certain
limited circumstances, be held personally liable as partners for 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 Fund
obligations include such disclaimer, and provides for indemnification and
reimbursement of expenses 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, in the opinion of Massachusetts
counsel to the Fund, the risk to shareholders of personal liability is remote.
 
    CODE OF ETHICS.  The Adviser is subject to a Code of Ethics with respect to
investment transactions in which the Adviser's officers, directors and certain
other persons have a beneficial interest to avoid any actual or potential
conflict or abuse of their fiduciary position. The Code of Ethics, as it
pertains to the TCW/DW Funds, contains several restrictions and procedures
designed to eliminate conflicts of interest including: (a) pre-clearance of
personal investment transactions to ensure that personal transactions by
employees are not being conducted at the same time as the Adviser's clients; (b)
quarterly reporting of personal securities transactions; (c) a prohibition
against personally acquiring securities in an initial public offering, entering
into uncovered short sales and writing uncovered options; (d) a seven day
"black-out period" prior to or subsequent to a TCW/DW Fund transaction during
which portfolio managers are prohibited from making certain transactions in
securities which are being purchased or sold by a TCW/DW Fund; (e) a
prohibition, with respect to certain investment personnel, from profiting in the
purchase and sale, or sale and purchase, of the same (or equivalent) securities
within 60 calendar days; and (f) a prohibition against acquiring any security
which is subject to firm wide or, if applicable, a department restriction of the
Adviser. The Code of Ethics provides that exemptive relief may be given from
certain of its requirements, upon application. The Adviser's Code of Ethics
complies with regulatory requirements and, insofar as it relates to persons
associated with registered investment companies, the 1994 Report of the Advisory
Group on Personal Investing of the Investment Company Institute.
 
    SHAREHOLDER INQUIRIES.  All inquiries regarding the Fund should be directed
to the Fund at the telephone numbers or address set forth on the front cover of
this Prospectus.
 
                                       27
<PAGE>
APPENDIX
- --------------------------------------------------------------------------------
 
RATINGS OF CORPORATE DEBT INSTRUMENTS
MOODY'S INVESTORS SERVICE INC. ("MOODY'S")
 
                         FIXED-INCOME SECURITY RATINGS
 
<TABLE>
<S>        <C>
Aaa        Fixed-income securities which are rated Aaa are judged to be of the best quality. They carry the
           smallest degree of investment risk and are generally referred to as "gilt edge." Interest payments
           are protected by a large or by an exceptionally stable margin and principal is secure. While the
           various protective elements are likely to change, such changes as can be visualized are most
           unlikely to impair the fundamentally strong position of such issues.
 
Aa         Fixed-income securities which are rated Aa are judged to be of high quality by all standards.
           Together with the Aaa group they comprise what are generally known as high grade fixed-income
           securities. They are rated lower than the best fixed-income securities because margins of
           protection may not be as large as in Aaa securities or fluctuation of protective elements may be of
           greater amplitude or there may be other elements present which make the long-term risks appear
           somewhat larger than in Aaa securities.
 
A          Fixed-income securities which are rated A possess many favorable investment attributes and are to
           be considered as upper medium grade obligations. Factors giving security to principal and interest
           are considered adequate, but elements may be present which suggest a susceptibility to impairment
           sometime in the future.
 
Baa        Fixed-income securities which are rated Baa are considered as medium grade obligations; i.e., they
           are neither highly protected nor poorly secured. Interest payments and principal security appear
           adequate for the present but certain protective elements may be lacking or may be
           characteristically unreliable over any great length of time. Such fixed-income securities lack
           outstanding investment characteristics and in fact have speculative characteristics as well.
 
           Fixed-income securities rated Aaa, Aa, A and Baa are considered investment grade.
 
Ba         Fixed-income securities which are rated Ba are judged to have speculative elements; their future
           cannot be considered as well assured. Often the protection of interest and principal payments may
           be very moderate, and therefore not well safeguarded during both good and bad times in the future.
           Uncertainty of position characterizes bonds in this class.
 
B          Fixed-income securities which are rated B generally lack characteristics of the desirable
           investment. Assurance of interest and principal payments or of maintenance of other terms of the
           contract over any long period of time may be small.
 
Caa        Fixed-income securities which are rated Caa are of poor standing. Such issues may be in default or
           there may be present elements of danger with respect to principal or interest.
 
Ca         Fixed-income securities which are rated Ca present obligations which are speculative in a high
           degree. Such issues are often in default or have other marked shortcomings.
 
C          Fixed-income securities which are rated C are the lowest rated class of fixed-income securities,
           and issues so rated can be regarded as having extremely poor prospects of ever attaining any real
           investment standing.
</TABLE>
 
    RATING REFINEMENTS:  Moody's may apply numerical modifiers, 1, 2, and 3 in
each generic rating classification from Aa through B in its municipal
fixed-income security rating system. The modifier 1 indicates that the security
ranks in the higher end of its generic rating category; the modifier 2 indicates
a mid-range ranking; and a modifier 3 indicates that the issue ranks in the
lower end of its generic rating category.
 
                            COMMERCIAL PAPER RATINGS
 
    Moody's Commercial Paper ratings are opinions of the ability to repay
punctually promissory obligations not having an original maturity in excess of
nine months. The ratings apply to Municipal Commercial Paper as well as taxable
Commercial Paper. Moody's employs the following three designations, all judged
to be investment grade, to indicate the relative repayment capacity of rated
issuers: Prime-1, Prime-2, Prime-3.
 
    Issuers rated Prime-1 have a superior capacity for repayment of short-term
promissory obligations. Issuers rated Prime-2 have a strong capacity for
repayment of short-term promissory obligations; and Issuers rated Prime-3 have
an acceptable
 
                                       28
<PAGE>
capacity for repayment of short-term promissory obligations. Issuers rated Not
Prime do not fall within any of the Prime rating categories.
 
STANDARD & POOR'S CORPORATION ("STANDARD & POOR'S")
 
                         FIXED-INCOME SECURITY RATINGS
 
    A Standard & Poor's fixed-income security rating is a current assessment of
the creditworthiness of an obligor with respect to a specific obligation. This
assessment may take into consideration obligors such as guarantors, insurers, or
lessees.
 
    The ratings are based on current information furnished by the issuer or
obtained by Standard & Poor's from other sources it considers reliable. The
ratings are based, in varying degrees, on the following considerations: (1)
likelihood of default-capacity and willingness of the obligor as to the timely
payment of interest and repayment of principal in accordance with the terms of
the obligation; (2) nature of and provisions of the obligation; and (3)
protection afforded by, and relative position of, the obligation in the event of
bankruptcy, reorganization or other arrangement under the laws of bankruptcy and
other laws affecting creditors' rights.
 
    Standard & Poor's does not perform an audit in connection with any rating
and may, on occasion, rely on unaudited financial information. The ratings may
be changed, suspended or withdrawn as a result of changes in, or unavailability
of, such information, or for other reasons.
 
<TABLE>
<S>        <C>
AAA        Fixed-income securities rated "AAA" have the highest rating assigned by Standard & Poor's.
           Capacity to pay interest and repay principal is extremely strong.
 
AA         Fixed-income securities rated "AA" have a very strong capacity to pay interest and repay principal
           and differs from the highest-rated issues only in small degree.
 
A          Fixed-income securities rated "A" have a strong capacity to pay interest and repay principal
           although they are somewhat more susceptible to the adverse effects of changes in circumstances and
           economic conditions than fixed-income securities in higher-rated categories.
 
BBB        Fixed-income securities rated "BBB" are regarded as having an adequate capacity to pay interest
           and repay principal. Whereas it normally exhibits adequate protection parameters, adverse economic
           conditions or changing circumstances are more likely to lead to a weakened capacity to pay
           interest and repay principal for fixed-income securities in this category than for fixed-income
           securities in higher-rated categories.
 
           Fixed-income securities rated AAA, AA, A and BBB are considered investment grade.
 
BB         Fixed-income securities rated "BB" have less near-term vulnerability to default than other
           speculative grade fixed-income securities. However, it faces major ongoing uncertainties or
           exposure to adverse business, financial or economic conditions which could lead to inadequate
           capacity or willingness to pay interest and repay principal.
 
B          Fixed-income securities rated "B" have a greater vulnerability to default but presently has the
           capacity to meet interest payments and principal repayments Adverse business, financial or
           economic conditions would likely impair capacity or willingness to pay interest and repay
           principal.
 
CCC        Fixed-income securities rated "CCC" have a current identifiable vulnerability to default, and is
           dependent upon favorable business, financial and economic conditions to meet timely payments of
           interest and repayments of principal. In the event of adverse business, financial or economic
           conditions, it is not likely to have the capacity to pay interest and repay principal.
 
CC         The rating "CC" is typically applied to fixed-income securities subordinated to senior debt which
           is assigned an actual or implied "CCC" rating.
 
C          The rating "C" is typically applied to fixed-income securities subordinated to senior debt which
           is assigned an actual or implied "CCC-" rating.
 
CI         The rating "CI" is reserved for fixed-income securities on which no interest is being paid.
 
NR         Indicates that no rating has been requested, that there is insufficient information on which to
           base a rating or that Standard & Poor's does not rate a particular type of obligation as a matter
           of policy.
</TABLE>
 
                                       29
<PAGE>
<TABLE>
<S>        <C>
           Fixed-income securities rated "BB", "B", "CCC", "CC" and "C" are regarded as having predominantly
           speculative characteristics with respect to capacity to pay interest and repay principal. "BB"
           indicates the least degree of speculation and "C" the highest degree of speculation. While such
           fixed-income securities will likely have some quality and protective characteristics, these are
           outweighed by large uncertainties or major risk exposures to adverse conditions.
 
           Plus (+) or minus (-): The rating from "AA" to "CCC" may be modified by the addition of a plus or
           minus sign to show relative standing with the major ratings categories.
</TABLE>
 
                            COMMERCIAL PAPER RATINGS
 
    Standard and Poor's commercial paper rating is a current assessment of the
likelihood of timely payment of debt having an original maturity of no more than
365 days. The commercial paper rating is not a recommendation to purchase or
sell a security. The ratings are based upon current information furnished by the
issuer or obtained by S&P from other sources it considers reliable. The ratings
may be changed, suspended, or withdrawn as a result of changes in or
unavailability of such information. Ratings are graded into group categories,
ranging from "A" for the highest quality obligations to "D" for the lowest.
Ratings are applicable to both taxable and tax-exempt commercial paper. The
categories are as follows:
 
    Issues assigned A ratings are regarded as having the greatest capacity for
timely payment. Issues in this category are further refined with the designation
1, 2, and 3 to indicate the relative degree of safety.
 
<TABLE>
<S>        <C>
A-1        indicates that the degree of safety regarding timely payment is very strong.
 
A-2        indicates capacity for timely payment on issues with this designation is strong. However, the
           relative degree of safety is not as overwhelming as for issues designated "A-1".
 
A-3        indicates a satisfactory capacity for timely payment. Obligations carrying this designation are,
           however, somewhat more vulnerable to the adverse effects of changes in circumstances than
           obligations carrying the higher designations.
</TABLE>
 
                                       30
<PAGE>
TCW/DW INCOME AND GROWTH FUND
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
TRUSTEES
John C. Argue
Richard M. DeMartini
Charles A. Fiumefreddo
John R. Haire
Dr. Manuel H. Johnson
Thomas E. Larkin, Jr.
Michael E. Nugent
John L. Schroeder
Marc I. Stern
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
Thomas E. Larkin, Jr.
President
Barry Fink
Vice President, Secretary and General Counsel
Robert M. Hanisee
Vice President
Kevin A. Hunter
Vice President
Mark Attanasio
Vice President
Melissa Weiler
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
MANAGER
Dean Witter Services Company Inc.
 
ADVISER
TCW Funds Management, Inc.


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