TCW DW INCOME & GROWTH FUND
497, 1996-04-19
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<PAGE>
            [LOGO]
                      INCOME AND
                      GROWTH FUND
 
                           PROSPECTUS
                           MARCH 26, 1996
 
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  not invest  in any  securities rated  lower than  B  by
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.")
 
Shares  of the Fund  are sold and redeemed  at net asset value.  The Fund pays a
distribution fee of up to  0.75% of its average  daily net assets in  accordance
with  a Plan of Distribution pursuant to Rule 12b-1 under the Investment Company
Act of 1940.
 
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 26,  1996, 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 4
Financial Highlights 5
The Fund and its Management 6
Investment Objective and Policies 6
  Risk Considerations 7
Investment Restrictions 11
Purchase of Fund Shares 12
Shareholder Services 13
Repurchases and Redemptions 15
Dividends, Distributions and Taxes 16
Performance Information 16
Additional Information 17
Appendix 18
 
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 17).
OFFERED
- ---------------------------------------------------------------------------------------------------------
OFFERING              The price of the shares offered by this Prospectus is determined once daily as of 4:00
PRICE                 p.m.,  New York time,  on each day  that the New  York Stock Exchange  is open, and is
                      equal to the net asset value per share (see page 12).
- ---------------------------------------------------------------------------------------------------------
MINIMUM               The minimum  initial investment  is $1,000  ($100  if the  account is  opened  through
PURCHASE              EasyInvest-SM-); minimum subsequent investment is $100 (see page 12).
- ---------------------------------------------------------------------------------------------------------
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 eleven 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  ninety-six investment companies and other  portfolios with assets of approximately
                      $82.5 billion at February 29, 1996.
- ---------------------------------------------------------------------------------------------------------
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 twelve other TCW/DW
                      Funds. As of February 29, 1996, the  Adviser and its affiliates had approximately  $53
                      billion  under management or committed to  management in various fiduciary or advisory
                      capacities, primarily from institutional investors.
- ---------------------------------------------------------------------------------------------------------
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 6).
- ---------------------------------------------------------------------------------------------------------
DIVIDENDS             Income dividends are  paid quarterly. Capital  gains, if any,  will be distributed  no
AND CAPITAL           less  than  annually.  Dividends  and capital  gains  distributions  are automatically
GAINS                 reinvested in additional shares  at net asset value  unless the shareholder elects  to
DISTRIBUTIONS         receive cash (see page 16).
- ---------------------------------------------------------------------------------------------------------
DISTRIBUTOR AND       Dean  Witter Distributors  Inc. (the "Distributor")  is the distributor  of the Fund's
PLAN OF               shares. The Fund is  authorized to reimburse specific  expenses incurred in  promoting
DISTRIBUTION          the distribution of the Fund's shares, including personal services to shareholders and
                      maintenance  of shareholder accounts,  in accordance with a  Plan of Distribution with
                      the Distributor  pursuant to  Rule 12b-1  under the  Investment Company  Act of  1940.
                      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 Fund (see page 12).
- ---------------------------------------------------------------------------------------------------------
REDEMPTION            Shares are  redeemable by  the  shareholder at  net asset  value.  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 pages 15-16).
</TABLE>
 
- --------------------------------------------------------------------------------
 
                                       2
<PAGE>
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                   <C>
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 7). 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 10).
</TABLE>
 
- --------------------------------------------------------------------------------
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                                   ELSEWHERE
       IN THIS PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL INFORMATION.
 
                                       3
<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 for the fiscal
year ended January 31, 1996.
 
<TABLE>
<S>                                                                                           <C>
SHAREHOLDER TRANSACTION EXPENSES
Maximum Sales Charge Imposed on Purchases...................................................  None
Maximum Sales Charge Imposed on Reinvested Dividends........................................  None
Deferred Sales Charge.......................................................................  None
Redemption Fees.............................................................................  None
Exchange Fee................................................................................  None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management and Advisory Fees................................................................  0.75%
12b-1 Fee*..................................................................................  0.75%
Other Expenses..............................................................................  0.71%
Total Fund Operating Expenses...............................................................  2.21%
</TABLE>
 
<TABLE>
<S>  <C>
<FN>
- ------------
 *   A portion  of the  12b-1 fee,  which may  not exceed  0.25% of  the  Fund's
     average  daily net  assets, is  characterized as  a service  fee within the
     meaning of  National  Association  of  Securities  Dealers,  Inc.  ("NASD")
     guidelines (see "Purchase of Fund Shares").
</TABLE>
 
<TABLE>
<CAPTION>
EXAMPLE                                                                   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) 5% annual  return and  (2) redemption at  the end  of each  time
  period:.............................................................   $      22    $      69    $     118    $     254
</TABLE>
 
    THE  ABOVE  EXAMPLE SHOULD  NOT BE  CONSIDERED A  REPRESENTATION OF  PAST OR
FUTURE EXPENSES OR PERFORMANCE.  ACTUAL EXPENSES OF THE  FUND 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" and "Plan of Distribution" in this Prospectus.
 
    Long-term shareholders of the  Fund may pay more  in distribution fees  than
the  economic equivalent of the maximum front-end sales charges permitted by the
NASD.
 
                                       4
<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
                                                                FOR THE YEAR       FOR THE YEAR      MARCH 31, 1993*
                                                                    ENDED              ENDED             THROUGH
                                                              JANUARY 31, 1996   JANUARY 31, 1995   JANUARY 31, 1994
                                                              -----------------  -----------------  -----------------
<S>                                                           <C>                <C>                <C>
PER SHARE OPERATING PERFORMANCE:
  Net asset value, beginning of period......................      $    9.77          $   10.98          $   10.00
                                                                    -------            -------            -------
    Net investment income...................................           0.59               0.59               0.45
    Net realized and unrealized gain (loss).................           1.37              (1.20)              1.02
                                                                    -------            -------            -------
  Total from investment operations..........................           1.96              (0.61)              1.47
                                                                    -------            -------            -------
  Less dividends and distributions from:
    Net investment income...................................          (0.60)             (0.55)             (0.39)
    Net realized gain.......................................         --                  (0.05)             (0.10)
                                                                    -------            -------            -------
  Total dividends and distributions.........................          (0.60)             (0.60)             (0.49)
                                                                    -------            -------            -------
  Net asset value, end of period............................      $   11.13          $    9.77          $   10.98
                                                                    -------            -------            -------
                                                                    -------            -------            -------
TOTAL INVESTMENT RETURN.....................................          20.52%             (5.59)%            15.06    %(1)
 
RATIOS TO AVERAGE NET ASSETS:
  Expenses..................................................           2.21%              2.04%              1.57    %(2)(3)
  Net investment income.....................................           5.41%              5.83%              5.62    %(2)(3)
SUPPLEMENTAL DATA:
  Net assets, end of period, in thousands...................  $      57,631      $      55,335      $      64,370
  Portfolio turnover rate...................................             79%                88%                84    %(1)
<FN>
- ------------
 *   COMMENCEMENT OF OPERATIONS.
(1)  NOT ANNUALIZED.
(2)  ANNUALIZED.
(3)  IF THE FUND HAD BORNE  ALL EXPENSES THAT WERE  REIMBURSED OR WAIVED BY  THE
     MANAGER  AND  INVESTMENT  ADVISER,  THE ABOVE  ANNUALIZED  EXPENSE  AND NET
     INVESTMENT INCOME RATIOS WOULD HAVE BEEN 2.00% AND 5.18%, RESPECTIVELY.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                       5
<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 Dean  Witter,  Discover  &  Co.
("DWDC"),  a balanced financial services organization providing a broad range of
nationally marketed credit and investment products.
 
    The Manager acts as  manager to eleven other  TCW/DW Funds. The Manager  and
InterCapital  act  in various  investment  management, advisory,  management and
administrative capacities to a total of ninety-six investment companies,  thirty
of  which are  listed on the  New York  Stock Exchange, with  combined assets of
approximately $79.9 billion as of  February 29, 1996. InterCapital also  manages
and  advises  portfolios of  pension plans,  other institutions  and individuals
which aggregated approximately $2.6 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  eleven other  TCW/DW  Funds in
addition to the Fund. As  of February 29, 1996,  the Adviser and its  affiliated
companies  had  approximately  $53  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, 1996,  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.  During
that  period, the Fund's total expenses amounted  to 2.21% of the Fund's average
daily net assets.
 
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  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
 
                                       6
<PAGE>
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  not  invest  in  convertible  and  other fixed-income
securities that are  rated lower  than B  by 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.
 
    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
 
                                       7
<PAGE>
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 period ended January 31, 1996, the monthly dollar weighted
average  ratings  of the  debt  obligations held  by  the Fund,  expressed  as a
percentage of the Fund's total investments, were as follows:
 
<TABLE>
<CAPTION>
                                            PERCENTAGE OF
                RATINGS                   TOTAL INVESTMENTS
- ---------------------------------------  -------------------
<S>                                      <C>
AAA/Aaa................................             0.0%
AA/Aa..................................             1.3%
A/A....................................             8.9%
BBB/Baa................................             5.6%
BB/Ba..................................            20.9%
B/B....................................            32.1%
CCC/Caa................................             0.0%
CC/Ca..................................             0.0%
C/C....................................             0.0%
D......................................             0.0%
Unrated................................            31.2%
</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.
 
    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.
 
                                       8
<PAGE>
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  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
 
                                       9
<PAGE>
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.
 
    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 3% of  its
total  assets in any one investment company,  as long as that investment company
does not represent more than 5% of  the voting stock of the acquired  investment
company  at the time such shares are purchased. 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 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.
 
                                       10
<PAGE>
    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.
 
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. since
1990 and 1989, respectively. 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.
Prior  thereto, she  was a Senior  Investment Analyst at  First Capital Holdings
Corporation.
 
    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"), a broker-dealer affiliate 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. The Fund may
incur brokerage commissions on transactions conducted through DWR. Under  normal
circumstances  it is not  anticipated that the portfolio  trading will result in
the Fund's portfolio turnover rate exceeding 100% in any one year. The Fund will
incur brokerage costs commensurate with its portfolio turnover rate.
 
    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.
 
                                       11
<PAGE>
        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
- --------------------------------------------------------------------------------
 
The Fund  offers 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 minimum initial purchase is $1,000  and subsequent purchases of $100  or
more  may be made by sending a check,  payable to TCW/DW Income and Growth Fund,
directly to Dean Witter Trust Company  (the "Transfer Agent") at P.O. Box  1040,
Jersey  City, NJ 07303, or by contacting  an account executive of DWR or another
Selected Broker-Dealer. 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. In  the
case  of investments pursuant  to Systematic Payroll  Deduction Plans (including
Individual  Retirement  Plans),  the  Fund,   in  its  discretion,  may   accept
investments  without  regard to  any minimum  amounts  which would  otherwise be
required if the  Fund 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.
 
    The offering price  will be the  net asset value  per share next  determined
following  receipt of an  order (see "Determination of  Net Asset Value"). Sales
personnel of a  Selected Broker-Dealer are  compensated for shares  of the  Fund
sold  by them 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.
 
PLAN OF DISTRIBUTION
 
The Fund has entered into  a Plan of Distribution  pursuant to Rule 12b-1  under
the  Act with  the Distributor  whereby the  expenses of  certain activities and
services,  including  personal  services  to  shareholders  and  maintenance  of
shareholder  accounts, in connection with the  distribution of the Fund's shares
are reimbursed. The principal activities and  services which may be provided  by
DWR,  its affiliates or any other Selected Broker-Dealer under the Plan include:
(1) compensation  to,  and  expenses  of, DWR  account  executives  and  others,
including  overhead and telephone expenses; (2)  sales incentives and bonuses to
sales representatives and  to marketing personnel  in connection with  promoting
sales  of the Fund's shares; (3)  expenses incurred in connection with promoting
sales of the Fund's shares; (4) preparing and distributing sales literature; and
(5) providing  advertising and  promotional  activities, including  direct  mail
solicitation   and  television,  radio,  newspaper,  magazine  and  other  media
advertisements. Reimbursements  for  these  services will  be  made  in  monthly
payments by the Fund, which will in no event exceed an amount equal to a payment
at the annual rate of 0.75% of the Fund's average daily net assets. A portion of
the  amount payable  pursuant to  the Plan,  which may  not exceed  0.25% of the
Fund's average daily net  assets, is characterized as  a service fee within  the
meaning  of NASD  guidelines. The  service fee  is a  payment made  for personal
service and/or  the  maintenance  of  shareholder  accounts.  Expenses  incurred
pursuant to the Plan in any fiscal year in excess of 0.75% of the Fund's average
daily  net assets will not be reimbursed by the Fund through payments accrued in
any subsequent  fiscal  year.  The  Fund accrued  $412,192  to  the  Distributor
pursuant  to the  Plan for the  fiscal year ended  January 31, 1996.  This is an
accrual at the annual rate of 0.75% of the Fund's average daily net assets.
 
                                       12
<PAGE>
DETERMINATION OF NET ASSET VALUE
 
The net asset value per share of the Fund 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 value  of  all assets  of  the Fund,  subtracting  all its
liabilities, dividing by the number of  shares outstanding and adjusting to  the
nearest  cent. 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 or quoted by  NASDAQ is valued at its  latest sale price on  that
exchange or quotation service 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
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 utilizes  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 Fund (or, if specified by the shareholder, any other TCW/DW Fund),
unless  the shareholder  requests that  they be paid  in cash.  Each purchase of
shares of the Fund is made upon the condition that the Transfer Agent is thereby
automatically appointed as agent  of the investor to  receive all dividends  and
capital  gains distributions on shares owned by the investor. Such dividends and
distributions will be paid, at the net  asset value per share, in shares of  the
Fund  (or in cash if the shareholder so requests) as of the close of business on
the record date.  At any time  an investor  may request the  Transfer Agent,  in
writing, to have subsequent dividends and/or capital gains distributions paid to
him  or her in cash  rather than shares. In order  to provide sufficient time to
process the change,  such request should  be received by  the Transfer Agent  at
least  five  business  days  prior  to  the  record  date  of  the  dividend  or
distribution. In the case  of recently purchased  shares for which  registration
instructions  have not been received  on the record date,  cash payments will be
made to DWR or  another Selected Broker-Dealer, which  will be forwarded to  the
shareholder, upon the receipt of proper instructions.
 
    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 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.
 
    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, 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.
 
    Shareholders should  contact  their  DWR  or  other  Selected  Broker-Dealer
account executive or the Transfer
 
                                       13
<PAGE>
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
 
An "Exchange Privilege," that is, the privilege of exchanging shares of  certain
Funds  for shares of the  Fund, exists whereby shares  of TCW/DW Funds which are
open-end investment  companies  sold with  a  contingent deferred  (at  time  of
redemption) sales charge ("CDSC Funds") may be exchanged for shares of the Fund,
for  shares of  TCW/DW North American  Government Income  Trust, TCW/DW Balanced
Fund, 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 eight  investment companies,  including  the
Fund, are hereinafter collectively referred to as "Exchange Funds").
 
    An  exchange from a CDSC Fund to an Exchange Fund that is not a money market
fund is on the basis  of the next calculated net  asset value per share of  each
fund  after the exchange order is received.  When exchanging into a money market
fund from  a CDSC  Fund, shares  of the  CDSC Fund  are redeemed  at their  next
calculated  net asset value and exchanged for shares of the money market fund at
their net  asset  value determined  the  following business  day.  Additionally,
shares  of any Exchange Fund  received in an exchange for  shares of a CDSC Fund
(regardless of  the type  of  fund originally  purchased)  may be  redeemed  and
exchanged  for  shares  of an  Exchange  Fund  or a  CDSC  Fund.  Any applicable
contingent deferred sales  charge ("CDSC") will  have to be  paid upon  ultimate
redemption  of shares originally purchased from a CDSC Fund. If those shares are
subsequently  reexchanged  for  shares  of  a  CDSC  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 CDSC Fund are reacquired. Thus, the CDSC is based
upon the time (calculated as described above) the shareholder was invested in  a
CDSC  Fund. However, 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  (see
"Purchase  of Fund  Shares --  Plan of Distribution"  in this  Prospectus or the
respective other Exchange  Fund prospectus  for a description  of Exchange  Fund
12b-1  distribution fees). Exchanges involving CDSC  Funds may be made after the
shares of  the CDSC  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.
 
    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
and any other conditions imposed by each  fund. 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
for-
 
                                       14
<PAGE>
ward 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 transactions.
 
    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.
 
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 -- Determination  of
Net  Asset Value") after such  repurchase order is received  by DWR or the other
Selected Broker-Dealer. The offers 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 the Fund can be redeemed for cash at any time at net
asset  value per share  next determined. 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. The share certificate, or  an accompanying stock power, and the
request for  redemption,  must be  signed  by the  shareholder  or  shareholders
exactly  as the shares  are registered. Each request  for redemption, whether or
not accompanied by  a share  certificate, must be  sent to  the Fund's  Transfer
Agent,  which will redeem the shares at their net asset value next determined as
described under "Purchase of  Fund Shares -- Determination  of Net Asset  Value"
after  it receives  the request,  and certificate,  if any,  in good  order. Any
redemption request received  after such  determination will be  redeemed at  the
next  determined net  asset value.  The term "good  order" means  that the share
certificate, if any, and request for redemption are properly signed, accompanied
by any  documentation  required  by  the  Transfer  Agent,  and  bear  signature
guarantees  when required by  the Fund or  the Transfer Agent.  If redemption is
requested by a corporation, partnership, trust or fiduciary, the Transfer  Agent
may  require that written evidence of authority acceptable to the Transfer Agent
be submitted before such request is accepted. With regard to shares of the  Fund
acquired  pursuant to the Exchange Privilege, any applicable contingent deferred
sales charge will be imposed upon  the redemption of such shares (see  "Purchase
of Fund Shares -- Exchange Privilege").
 
    Whether  certificates are held  by the shareholder  or shares are  held in a
shareholder's account, if the proceeds are to  be paid to any person other  than
the record owner, or if the proceeds are to be paid to a corporation (other than
DWR  or  another Selected  Broker-Dealer for  the  account of  the shareholder),
partnership, trust or fiduciary, or sent to the shareholder at an address  other
than  the  registered  address, signatures  must  be guaranteed  by  an eligible
guarantor acceptable  to the  Transfer Agent  (shareholders should  contact  the
Transfer  Agent for  a determination as  to whether a  particular institution is
such an eligible guarantor). A  stock power may be  obtained from any dealer  or
commercial  bank. The Fund may change  the signature guarantee requirements from
time to time upon  notice to shareholders,  which may be by  means of a  revised
prospectus.
 
    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
 
                                       15
<PAGE>
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 30 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 at  net asset value  next determined  after a  reinstatement
request, together with the proceeds, is received by the Transfer Agent.
 
    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  him or her 60 days  to
make  an additional investment in an amount which will increase the value of his
or her  account to  at least  the  applicable amount  before the  redemption  is
processed.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    DIVIDENDS  AND DISTRIBUTIONS.   The Fund intends  to pay quarterly dividends
and to distribute  substantially all of  the Fund's net  investment income.  The
Fund  may distribute  quarterly net short-term  capital gains, if  any. The Fund
intends 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
Fund shares  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. (See "Shareholders  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 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.
 
    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.
 
    After the  end  of  the  calendar  year,  shareholders  will  be  sent  full
information on their dividends and capital gains distributions for tax purposes.
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. 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 the  Fund is computed by  dividing the net investment
income of the Fund 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 yield of the Fund.
 
                                       16
<PAGE>
    From time to time  the Fund may quote  its "total return" in  advertisements
and  sales  literature. The  total return  of  the Fund  is based  on historical
earnings and is not intended to indicate future performance. 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 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 Fund, which would be incurred  by
redeeming  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  over
different  periods of time  by means of aggregate,  average, and year-by-year or
other types of total return figures. The  Fund may also advertise the growth  of
hypothetical investments of $10,000, $50,000 and $100,000 in 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.
 
    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.
 
    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 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 number or  address set forth on the front cover of
this Prospectus.
 
                                       17
<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  capacity  for repayment  of  short-term  promissory obligations.
Issuers rated Not Prime do not fall within any of the Prime rating categories.
 
                                       18
<PAGE>
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.
           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>
 
                                       19
<PAGE>
                            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>
 
                                       20
<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
Paul Kolton
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
Sheldon Curtis
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
Dean Witter Trust Company
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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