TCW DW INCOME & GROWTH FUND
497, 1997-04-10
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<PAGE>
            [LOGO]
                      INCOME AND
                      GROWTH FUND
 
                           PROSPECTUS
                           APRIL 2, 1997
 
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 April 2, 1997, 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 17
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 thirteen other investment companies which are advised by TCW
                      Funds Management, Inc. (the "TCW/DW Funds"). The Manager and InterCapital serve in
                      various investment management, advisory, management and administrative capacities to a
                      total of 101 investment companies and other portfolios with assets of approximately
                      $93 billion at February 28, 1997.
- ---------------------------------------------------------------------------------------------------------
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 thirteen other
                      TCW/DW Funds. As of February 28, 1997, the Adviser and its affiliates had over $50
                      billion under management or committed to management in various fiduciary or advisory
                      capacities, primarily from institutional investors.
- ---------------------------------------------------------------------------------------------------------
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 pages 12-13).
- ---------------------------------------------------------------------------------------------------------
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 page 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 9).
</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, 1997.
 
<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*..................................................................................  0.74%
Other Expenses..............................................................................  0.53%
Total Fund Operating Expenses...............................................................  2.02%
</TABLE>
 
- ------------
*   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>
<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:..........   $      21    $      63    $     109    $     235
</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 ENDED JANUARY 31,        MARCH 31, 1993*
                                         ---------------------------------          THROUGH
                                          1997         1996         1995        JANUARY 31, 1994
                                         -------      -------      -------      ----------------
<S>                                      <C>          <C>          <C>          <C>
PER SHARE OPERATING PERFORMANCE:
  Net asset value, beginning of
   period..........................      $ 11.13      $  9.77      $ 10.98          $ 10.00
                                         -------      -------      -------          -------
    Net investment income..........         0.60         0.59         0.59             0.45
    Net realized and unrealized
     gain (loss)...................         0.84         1.37        (1.20)            1.02
                                         -------      -------      -------          -------
  Total from investment
   operations......................         1.44         1.96        (0.61)            1.47
                                         -------      -------      -------          -------
  Less dividends and distributions
   from:
    Net investment income..........        (0.60)       (0.60)       (0.55)           (0.39)
    Net realized gain..............        (0.55)       --           (0.05)           (0.10)
                                         -------      -------      -------          -------
  Total dividends and
   distributions...................        (1.15)       (0.60)       (0.60)           (0.49)
                                         -------      -------      -------          -------
  Net asset value, end of period...      $ 11.42      $ 11.13      $  9.77          $ 10.98
                                         -------      -------      -------          -------
                                         -------      -------      -------          -------
TOTAL INVESTMENT RETURN+...........        13.46%       20.52%       (5.59)%          15.06%(1)
 
RATIOS TO AVERAGE NET ASSETS:
  Expenses.........................         2.02%        2.21%        2.04%            1.57%(2)(3)
  Net investment income............         5.19%        5.41%        5.83%            5.62%(2)(3)
 
SUPPLEMENTAL DATA:
  Net assets, end of period, in
   thousands.......................      $60,941      $57,631      $55,335          $64,370
  Portfolio turnover rate..........          102%          79%          88%              84%(1)
  Average commission rate paid.....      $0.0540        --           --             --
</TABLE>
 
- ------------
 *  COMMENCEMENT OF OPERATIONS.
 
 +  CALCULATED BASED ON THE NET ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE
    PERIOD.
 
(1) NOT ANNUALIZED.
 
(2) ANNUALIZED.
 
(3) IF THE FUND HAD BORNE EXPENSES THAT WERE REIMBURSED OR WAIVED BY THE MANAGER
    AND INVESTMENT ADVISER, THE ANNUALIZED EXPENSE AND NET INVESTMENT INCOME
    RATIOS WOULD HAVE BEEN 2.00% AND 5.18%, RESPECTIVELY.
 
                       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.
 
    On February 5, 1997, DWDC and Morgan Stanley Group Inc. announced that they
had entered into an Agreement and Plan of Merger, with the combined company to
be named Morgan Stanley, Dean Witter, Discover & Co. The business of Morgan
Stanley Group Inc. and its affiliated companies is providing a wide range of
financial services for sovereign governments, corporations, institutions and
individuals throughout the world. DWDC is the direct parent of InterCapital and
Dean Witter Distributors Inc., the Fund's distributor. It is currently
anticipated that the transaction will close in mid-1997. Thereafter,
InterCapital and Dean Witter Distributors Inc. will be direct subsidiaries of
Morgan Stanley, Dean Witter, Discover & Co.
 
    The Manager acts as manager to thirteen other TCW/ DW Funds. The Manager and
InterCapital act in various investment management, advisory, management and
administrative capacities to a total of 101 investment companies, thirty of
which are listed on the New York Stock Exchange, with combined assets of
approximately $89.8 billion as of February 28, 1997. InterCapital also manages
and advises portfolios of pension plans, other institutions and individuals
which aggregated approximately $3.2 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 thirteen other TCW/DW Funds in
addition to the Fund. As of February 28, 1997, the Adviser and its affiliated
companies had over $50 billion under management or committed to management,
primarily from institutional investors.
 
    The Fund has retained the Adviser to invest the Fund's assets.
 
    The Fund's Trustees review the various services provided by the Manager and
the Adviser to ensure that the Fund's general investment policies and programs
are being properly carried out and that administrative services are being
provided to the Fund in a satisfactory manner.
 
    As full compensation for the services and facilities furnished to the Fund
and for expenses of the Fund assumed by the Manager, the Fund pays the Manager
monthly compensation calculated daily by applying the annual rate of 0.45% to
the Fund's net assets up to $500 million, scaled down to 0.42% on assets over
$500 million. As compensation for its investment advisory services, the Fund
pays the Adviser monthly compensation calculated daily by applying an annual
rate of 0.30% to the Fund's net assets up to $500 million, scaled down to 0.28%
on assets over $500 million. For the fiscal year ended January 31, 1997, 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 2.02% 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
 
                                       6
<PAGE>
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 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
 
                                       7
<PAGE>
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 financing. If the issuer of a fixed-income security owned by the Fund
defaults, the Fund may incur additional expenses to seek recovery. In addition,
periods of economic uncertainty and change can be expected to result in an
increased volatility of market prices of high yield securities and a concomitant
volatility in the net asset value of a share of the Fund.
 
    The secondary market for high yield securities may be less liquid than the
markets for higher quality securities and, as such, may have an adverse effect
on the market prices of certain securities. The limited liquidity of the market
may also adversely affect the ability of the Fund's Trustees to arrive at a fair
value for certain high yield securities at certain times and could make it
difficult for the Fund to sell certain securities. In addition, new laws and
potential new laws may have an adverse effect upon the value of high yield
securities and a concomitant negative impact upon the net asset value of a share
of the Fund.
 
    For a discussion of the risks of the Fund's status as a non-diversified
investment company, see "Other Investment Policies," below. For a discussion of
warrants and stock rights, see "Warrants and Stock Rights," below. For a
discussion of the risks of options and futures transactions, see "Options and
Futures Transactions," below.
 
    During the fiscal year ended January 31, 1997, 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.................................            1.1%
AA/Aa...................................            0.2%
A/A.....................................            6.8%
BBB/Baa.................................            4.3%
BB/Ba...................................           20.5%
B/B.....................................           37.5%
CCC/Caa.................................            0.0%
CC/Ca...................................            0.0%
C/C.....................................            0.0%
D.......................................            0.0%
Unrated.................................           14.5%
</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.
 
                                       8
<PAGE>
WARRANTS AND STOCK RIGHTS
 
The Fund may invest up to 5% of the value of its net assets in warrants,
including not more than 2% in warrants not listed on either the New York or
American Stock Exchange. The Fund may also invest up to 5% of the value of its
net assets in stock rights. Warrants are, in effect, an option to purchase
equity securities at a specific price, generally valid for a specific period of
time, and have no voting rights, pay no dividends and have no rights with
respect to the corporations issuing them. The Fund may acquire warrants and
stock rights attached to other securities without reference to the foregoing
limitations.
 
OTHER INVESTMENT POLICIES
 
While the Fund invests primarily in the types of securities described above,
under ordinary circumstances it may invest up to 35% of its total assets in
money market instruments, which are short-term (maturities of up to thirteen
months) fixed-income securities issued by private and governmental institutions.
Money market instruments in which the Fund may invest are securities issued or
guaranteed by the U.S. Government or its agencies; obligations of banks subject
to regulation by the U.S. Government and having total assets of $1 billion or
more; Eurodollar certifi cates 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
 
                                       9
<PAGE>
resale because they have not been registered under the Securities Act of 1933,
as amended (the "Securities Act"), or which are otherwise not readily
marketable. (Securities eligible for resale pursuant to Rule 144A under the
Securities Act, and determined to be liquid pursuant to the procedures discussed
in the following paragraph, are not subject to the foregoing restriction.) These
securities are generally referred to as private placements or restricted
securities. Limitations on the resale of such securities may have an adverse
effect on their marketability, and may prevent the Fund from disposing of them
promptly at reasonable prices. The Fund may have to bear the expense of
registering such securities for resale and the risk of substantial delays in
effecting such registration.
 
    The Securities and Exchange Commission has adopted Rule 144A under the
Securities Act, which permits the Fund to sell restricted securities to
qualified institutional buyers without limitation. The Adviser, pursuant to
procedures adopted by the Trustees of the Fund, will make a determination as to
the liquidity of each restricted security purchased by the Fund. If a restricted
security is determined to be "liquid," such security will not be included within
the category "illiquid securities," which under current policy may not exceed
15% of the Fund's net assets. However, investing in Rule 144A securities could
have the effect of increasing the level of Fund illiquidity to the extent the
Fund, at a particular period in time, may be unable to find qualified
institutional buyers in purchasing such securities.
 
    INVESTMENT IN OTHER INVESTMENT VEHICLES.  Under the Investment Company Act
of 1940, as amended, the Fund generally may invest up to 10% of its total assets
in the aggregate in shares of other investment companies and up to 5% of its
total assets in any one investment company. The Fund may not own more than 3% of
the voting stock of any investment company. In addition, the Fund may invest in
real estate investment trusts, which pool investors' funds for investments
primarily in commercial real estate properties. Investment in other investment
companies may be the sole or most practical means by which the Fund may
participate in certain securities markets, and investment in real estate
investment trusts may be the most practical available means for the Fund to
invest in the real estate industry (the Fund is prohibited from investing in
real estate directly). As a shareholder in an investment company or real estate
investment trust, the Fund would bear its ratable share of that entity's
expenses, including its advisory and administration fees. At the same time the
Fund would continue to pay its own investment management fees and other
expenses, as a result of which the Fund and its shareholders in effect will be
absorbing duplicate levels of fees with respect to investments in other
investment companies and in real estate investment trusts.
 
    ZERO COUPON SECURITIES.  A portion of the fixed-income securities purchased
by the Fund may be zero coupon securities. Such securities are purchased at a
discount from their face amount, giving the purchaser the right to receive their
full value at maturity. The interest earned on such securities is, implicitly,
automatically compounded and paid out at maturity. While such compounding at a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest if prevailing interest rates decline, the owner of a zero coupon
security will be unable to participate in higher yields upon reinvestment of
interest received on interest-paying securities if prevailing interest rates
rise.
 
    A zero coupon security pays no interest to its holder during its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash available for distribution to shareholders. In addition,
zero coupon securities are subject to substantially greater price fluctuations
during periods of changing prevailing interest rates than are comparable
securities which pay interest on a current basis. Current federal tax law
requires that a holder (such as the Fund) of a zero coupon security accrue a
portion of the discount at which the security was purchased as income each year
even though the Fund receives no interest payments in cash on the security
during the year.
 
OPTIONS AND FUTURES TRANSACTIONS
 
The Fund may purchase and sell (write) call and put options on portfolio
securities and on the U.S. dollar which are or may in the future be listed on
securities exchanges or are written in over-the-counter transactions ("OTC
Options"). Listed options are issued or guaranteed by the exchange on which they
trade or by a clearing corporation such as the Options Clearing Corporation. OTC
options are purchased from or sold (written) to dealers or financial
institutions which have entered into direct agreements with the Fund. The Fund
is permitted to write covered call options on portfolio securities and the U.S.
dollar, without limit, in order to aid it in achieving its investment objective.
The Fund may also write covered put options; however, the aggregate value of the
obligations underlying the puts determined as of the date the options are sold
will not exceed 50% of the Fund's net assets.
 
    The Fund may purchase listed and OTC call and put options on securities and
stock indexes in amounts equalling up to 5% of its total assets. The Fund may
purchase call options to close out a covered call position or to protect against
an increase in the price of a security it anticipates purchasing. The Fund may
purchase put options on securities which it holds in its portfolio only to
protect itself against a decline in the value of the security. The Fund may also
purchase put options to close out written put positions in a manner similar to
call option closing purchase transactions. There are no other limits on the
Fund's ability to purchase call and put options.
 
    The Fund may also purchase and sell interest rate and stock index futures
contracts ("futures contracts") that are 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
 
                                       10
<PAGE>
Exchange Composite Index ("stock index" futures) and the Moody's
Investment-Grade Corporation Bond Index ("bond index" futures). The Fund will
purchase or sell interest rate futures contracts and bond index futures
contracts for the purpose of hedging its fixed-income portfolio (or anticipated
portfolio) against changes in prevailing interest rates and to alter the Fund's
asset allocation in fixed-income securities. The Fund will purchase or sell
stock index futures contracts for the purpose of hedging its equity portfolio
(or anticipated portfolio) against changes in their prices.
 
    The Fund also may purchase and write call and put options on futures
contracts which are traded on an exchange and enter into closing transactions
with respect to such options to terminate an existing position.
 
    New futures contracts, options and other financial products and various
combinations thereof continue to be developed. The Fund may invest in any such
futures, options or products as may be developed, to the extent consistent with
its investment objective and applicable regulatory requirements.
 
    RISKS OF OPTIONS AND FUTURES TRANSACTIONS.  The Fund may close out its
position as writer of an option, or as a buyer or seller of a futures contract,
only if a liquid secondary market exists for options or futures contracts of
that series. There is no assurance that such a market will exist, particularly
in the case of OTC options, as such options may generally only be closed out by
entering into a closing purchase transaction with the purchasing dealer. Also,
exchanges may limit the amount by which the price of many futures contracts may
move on any day. If the price moves equal the daily limit on successive days,
then it may prove impossible to liquidate a futures position until the daily
limit moves have ceased.
 
    While the futures contracts and options transactions to be engaged in by the
Fund for the purpose of hedging the Fund's portfolio securities are not
speculative in nature, there are risks inherent in the use of such instruments.
One such risk is that the Adviser could be incorrect in its expectations as to
the direction or extent of various interest rate or price movements or the time
span within which the movements take place. For example, if the Fund sold
futures contracts for the sale of securities in anticipation of an increase in
interest rates, and then interest rates went down instead, causing bond prices
to rise, the Fund would lose money on the sale. Another risk which will arise in
employing futures contracts to protect against the price volatility of portfolio
securities is that the prices of securities, currencies and indexes subject to
futures contracts (and thereby the futures contract prices) may correlate
imperfectly with the behavior of the dollar cash prices of the Fund's portfolio
securities and their denominated currencies. See the Statement of Additional
Information for a further discussion of such risks.
 
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
out-
 
                                       11
<PAGE>
standing voting securities of the Fund, as defined in the Act. For purposes of
the following limitations: (i) all percentage limitations apply immediately
after a purchase or initial investment, and (ii) any subsequent change in any
applicable percentage resulting from market fluctuations or other changes in
total or net assets does not require elimination of any security from the
portfolio.
 
    The Fund may not:
 
        1.  Invest 25% or more of the value of its total assets in securities of
    issuers in any one industry. This restriction does not apply to obligations
    issued or guaranteed by the United States Government, its agencies or
    instrumentalities.
 
        2.  Invest more than 5% of the value of its total assets in securities
    of issuers having a record, together with predecessors, of less than three
    years of continuous operation. This restriction does not apply to
    obligations issued or guaranteed by the United States Government, its
    agencies or instrumentalities.
 
    In addition, as a non-fundamental policy, the Fund may not, as to 75% of its
total assets, purchase more than 10% of the voting securities of any issuer.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
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
charac-
 
                                       12
<PAGE>
terized 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
$425,303 to the Distributor pursuant to the Plan for the fiscal year ended
January 31, 1997. This is an accrual at the annual rate of 0.74% of the Fund's
average daily net assets.
 
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 is valued at its latest sale price on that exchange prior to the
time when assets are valued; if there were no sales that day, the security is
valued at the latest bid price (in cases where securities are traded on more
than one exchange, the securities are valued on the exchange designated as the
primary market pursuant to procedures adopted by the Trustees); and (2) all
other portfolio securities for which over-the-counter market quotations are
readily available are valued at the latest available bid price prior to the time
of valuation. When market quotations are not readily available, including
circumstances under which it is determined by the Adviser that sale or bid
prices are not reflective of a security's market value, portfolio securities are
valued at their fair value as determined in good faith under procedures
established by and under the general supervision of the Fund's Trustees. For
valuation purposes, quotations of foreign portfolio securities are translated
into U.S. dollar equivalents at the prevailing market rates prior to the close
of the New York Stock Exchange. Dividends receivable are accrued as of the
ex-dividend date or as of the time that the relevant ex-dividend date and
amounts become known.
 
    Short-term debt securities with remaining maturities of 60 days or less at
the time of purchase are valued at amortized cost, unless the Trustees determine
such does not reflect the securities' market value, in which case these
securities will be valued at their fair value as determined by the Trustees.
 
    Certain of the Fund's portfolio securities may be valued by an outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a matrix system incorporating security quality, maturity and coupon as the
evaluation model parameters, and/or research and evaluations by its staff,
including review of broker-dealer market price quotations, in determining what
it believes is the fair valuation of the portfolio securities valued by such
pricing service.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS.  All income dividends
and capital gains distributions are automatically paid in full and fractional
shares of the 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").
 
                                       13
<PAGE>
    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 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
 
                                       14
<PAGE>
Privilege is only available in states where an exchange may legally be made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its account numbers are part of the account information, shareholders may
initiate an exchange of shares of the Fund for shares of any of the funds for
which the Exchange Privilege is available pursuant to this Exchange Privilege by
contacting their DWR or other Selected Broker-Dealer account executive (no
Exchange Privilege Authorization Form is required). Other shareholders (and
those shareholders who are clients of DWR or other Selected Broker-Dealers but
who wish to make exchanges directly by writing or telephoning the Transfer
Agent) must complete and forward to the Transfer Agent an Exchange Privilege
Authorization Form, copies of which may be obtained from the Transfer Agent, to
initiate an exchange. If the Authorization Form is used, exchanges may be made
in writing or by contacting the Transfer Agent at (800) 869-NEWS (toll free).
The Fund will employ reasonable procedures to confirm that exchange instructions
communicated over the telephone are genuine. The procedures include requiring
various forms of personal identification such as name, mailing address, social
security or other tax identification number and DWR or other Selected
Broker-Dealer account number (if any). Telephone instructions will also be
recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent 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
 
                                       15
<PAGE>
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 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 the shareholder 60 days
to make an additional investment in an amount which will increase the value of
the account to at least the applicable amount before the redemption is
processed.
 
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 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.
 
    The Fund may at times make payments from sources other than income or net
capital gains. Payments from such sources, in effect, represent a return of a
portion of each shareholder's investment. All, or a portion, of such payments
will not be taxable to shareholders.
 
    After the end of the calendar year, shareholders will be sent full
information on their dividends and capital gains distributions for tax purposes.
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.
 
                                       16
<PAGE>
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.
 
    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 1994 Report of the Advisory
Group on Personal Investing of the Investment Company Institute.
 
    SHAREHOLDER INQUIRIES.  All inquiries regarding the Fund should be directed
to the Fund at the telephone numbers or address set forth on the front cover of
 
this Prospectus.
 
                                       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
 
                                       18
<PAGE>
capacity for repayment of short-term promissory obligations. Issuers rated Not
Prime do not fall within any of the Prime rating categories.
 
STANDARD & POOR'S CORPORATION ("STANDARD & POOR'S")
 
                         FIXED-INCOME SECURITY RATINGS
 
    A Standard & Poor's fixed-income security rating is a current assessment of
the creditworthiness of an obligor with respect to a specific obligation. This
assessment may take into consideration obligors such as guarantors, insurers, or
lessees.
 
    The ratings are based on current information furnished by the issuer or
obtained by Standard & Poor's from other sources it considers reliable. The
ratings are based, in varying degrees, on the following considerations: (1)
likelihood of default-capacity and willingness of the obligor as to the timely
payment of interest and repayment of principal in accordance with the terms of
the obligation; (2) nature of and provisions of the obligation; and (3)
protection afforded by, and relative position of, the obligation in the event of
bankruptcy, reorganization or other arrangement under the laws of bankruptcy and
other laws affecting creditors' rights.
 
    Standard & Poor's does not perform an audit in connection with any rating
and may, on occasion, rely on unaudited financial information. The ratings may
be changed, suspended or withdrawn as a result of changes in, or unavailability
of, such information, or for other reasons.
 
<TABLE>
<S>        <C>
AAA        Fixed-income securities rated "AAA" have the highest rating assigned by Standard & Poor's.
           Capacity to pay interest and repay principal is extremely strong.
 
AA         Fixed-income securities rated "AA" have a very strong capacity to pay interest and repay principal
           and differs from the highest-rated issues only in small degree.
 
A          Fixed-income securities rated "A" have a strong capacity to pay interest and repay principal
           although they are somewhat more susceptible to the adverse effects of changes in circumstances and
           economic conditions than fixed-income securities in higher-rated categories.
 
BBB        Fixed-income securities rated "BBB" are regarded as having an adequate capacity to pay interest
           and repay principal. Whereas it normally exhibits adequate protection parameters, adverse economic
           conditions or changing circumstances are more likely to lead to a weakened capacity to pay
           interest and repay principal for fixed-income securities in this category than for fixed-income
           securities in higher-rated categories.
 
           Fixed-income securities rated AAA, AA, A and BBB are considered investment grade.
 
BB         Fixed-income securities rated "BB" have less near-term vulnerability to default than other
           speculative grade fixed-income securities. However, it faces major ongoing uncertainties or
           exposure to adverse business, financial or economic conditions which could lead to inadequate
           capacity or willingness to pay interest and repay principal.
 
B          Fixed-income securities rated "B" have a greater vulnerability to default but presently has the
           capacity to meet interest payments and principal repayments Adverse business, financial or
           economic conditions would likely impair capacity or willingness to pay interest and repay
           principal.
 
CCC        Fixed-income securities rated "CCC" have a current identifiable vulnerability to default, and is
           dependent upon favorable business, financial and economic conditions to meet timely payments of
           interest and repayments of principal. In the event of adverse business, financial or economic
           conditions, it is not likely to have the capacity to pay interest and repay principal.
 
CC         The rating "CC" is typically applied to fixed-income securities subordinated to senior debt which
           is assigned an actual or implied "CCC" rating.
 
C          The rating "C" is typically applied to fixed-income securities subordinated to senior debt which
           is assigned an actual or implied "CCC-" rating.
 
CI         The rating "CI" is reserved for fixed-income securities on which no interest is being paid.
 
NR         Indicates that no rating has been requested, that there is insufficient information on which to
           base a rating or that Standard & Poor's does not rate a particular type of obligation as a matter
           of policy.
</TABLE>
 
                                       19
<PAGE>
<TABLE>
<S>        <C>
           Fixed-income securities rated "BB", "B", "CCC", "CC" and "C" are regarded as having predominantly
           speculative characteristics with respect to capacity to pay interest and repay principal. "BB"
           indicates the least degree of speculation and "C" the highest degree of speculation. While such
           fixed-income securities will likely have some quality and protective characteristics, these are
           outweighed by large uncertainties or major risk exposures to adverse conditions.
 
           Plus (+) or minus (-): The rating from "AA" to "CCC" may be modified by the addition of a plus or
           minus sign to show relative standing with the major ratings categories.
</TABLE>
 
                            COMMERCIAL PAPER RATINGS
 
    Standard and Poor's commercial paper rating is a current assessment of the
likelihood of timely payment of debt having an original maturity of no more than
365 days. The commercial paper rating is not a recommendation to purchase or
sell a security. The ratings are based upon current information furnished by the
issuer or obtained by S&P from other sources it considers reliable. The ratings
may be changed, suspended, or withdrawn as a result of changes in or
unavailability of such information. Ratings are graded into group categories,
ranging from "A" for the highest quality obligations to "D" for the lowest.
Ratings are applicable to both taxable and tax-exempt commercial paper. The
categories are as follows:
 
    Issues assigned A ratings are regarded as having the greatest capacity for
timely payment. Issues in this category are further refined with the designation
1, 2, and 3 to indicate the relative degree of safety.
 
<TABLE>
<S>        <C>
A-1        indicates that the degree of safety regarding timely payment is very strong.
 
A-2        indicates capacity for timely payment on issues with this designation is strong. However, the
           relative degree of safety is not as overwhelming as for issues designated "A-1".
 
A-3        indicates a satisfactory capacity for timely payment. Obligations carrying this designation are,
           however, somewhat more vulnerable to the adverse effects of changes in circumstances than
           obligations carrying the higher designations.
</TABLE>
 
                                       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
Thomas E. Larkin, Jr.
Michael E. Nugent
John L. Schroeder
Marc I. Stern
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Thomas E. Larkin, Jr.
President
Barry Fink
Vice President, Secretary and
General Counsel
Robert M. Hanisee
Vice President
Kevin A. Hunter
Vice President
Mark Attanasio
Vice President
Melissa Weiler
Vice President
Thomas F. Caloia
Treasurer
CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
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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