GOVERNMENT SEC INC FD MON PYMT U S TREAS SER 21 D A F
497, 1999-01-25
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                                     DEFINED ASSET FUNDSSM
- --------------------------------------------
- ----------------------------------
 

                              GOVERNMENT SECURITIES INCOME FUND
                              MONTHLY PAYMENT U.S. TREASURY
                              SERIES--21
                              (LADDERED MATURITIES)
                              A UNIT INVESTMENT TRUST
                              O   PORTFOLIO OF AAA-RATED U.S. TREASURY NOTES
                              O   LADDERED MATURITIES
                              O   MONTHLY INCOME DISTRIBUTIONS
                              O   U.S. TAX EXEMPT FOR MANY FOREIGN HOLDERS

 

SPONSORS:
Merrill Lynch,
Pierce, Fenner & Smith         -------------------------------------------------
Incorporated                   The Securities and Exchange Commission has not
Salomon Smith Barney Inc.      approved or disapproved these Securities or
PaineWebber Incorporated       passed upon the adequacy of this prospectus. Any
Dean Witter Reynolds Inc.      representation to the contrary is a criminal
Prudential Securities          offense.
Incorporated                   Prospectus dated January 22, 1999.

 
<PAGE>
- --------------------------------------------------------------------------------
 
Defined Asset FundsSM
Defined Asset FundsSM is America's oldest and largest family of unit investment
trusts, with over $115 billion sponsored over the last 25 years. Defined Asset
Funds has been a leader in unit investment trust research and product
innovation. Our family of Funds helps investors work toward their financial
goals with a full range of quality investments, including municipal, corporate
and government bond portfolios, as well as domestic and international equity
portfolios.
 
Defined Asset Funds offer a number of advantages:
   o A disciplined strategy of buying and holding with a long-term view is the
     cornerstone of Defined Asset Funds.
   o Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
     funds are not managed and portfolio changes are limited.
o Defined Portfolios: We choose the stocks and bonds in advance, so you know
  what you're investing in.
o Professional research: Our dedicated research team seeks out stocks or bonds
      appropriate for a particular fund's objectives.
o Ongoing supervision: We monitor each portfolio on an ongoing basis.
No matter what your investment goals, tolerance for risk or time horizon,
there's probably a Defined Asset Fund that suits your investment style. Your
financial professional can help you select a Defined Asset Fund that works best
for your investment portfolio.
 
THE FINANCIAL INFORMATION IN THIS PROSPECTUS IS AS OF THE EVALUATION DATE,
OCTOBER 31, 1998.
 

CONTENTS
                                                                PAGE
                                                          -----------
Risk/Return Summary.....................................           3
What You Can Expect From Your Investment................           5
   Monthly Income.......................................           5
   Return Figures.......................................           5
   Records and Reports..................................           5
The Risks You Face......................................           6
   Interest Rate Risk...................................           6
   Reduced Diversification Risk.........................           6
   Litigation Risk......................................           6
Selling or Exchanging Units.............................           6
   Sponsors' Secondary Market...........................           6
   Selling Units to the Trustee.........................           6
   Exchange Option......................................           7
How The Fund Works......................................           7
   Pricing..............................................           7
   Evaluations..........................................           7
   Income...............................................           8
   Expenses.............................................           8
   Portfolio Changes....................................           8
   Fund Termination.....................................           9
   Certificates.........................................           9
   Trust Indenture......................................           9
   Legal Opinion........................................          10
   Auditors.............................................          10
   Sponsors.............................................          10
   Trustee..............................................          10
   Underwriters' and Sponsors' Profits..................          11
   Public Distribution..................................          11
   Code of Ethics.......................................          11
   Year 2000 Issues.....................................          11
Taxes...................................................          11
Supplemental Information................................          12
Financial Statements....................................         D-1

 
                                       2
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- --------------------------------------------------------------------------------
 
RISK/RETURN SUMMARY
 

       1.  WHAT IS THE FUND'S OBJECTIVE?
           The Fund seeks current interest income, safety of capital
           and flexibility by investing for approximately 4 years in a
           fixed, laddered portfolio of U.S. Treasury notes maturing
           each year 2000-2004.
       2.  WHAT ARE U.S. TREASURY NOTES?
           These are directly issued by the U.S. Treasury and are
           similar to corporate bonds in that they pay interest
           semi-annually. They are issued to fund various government
           activities. In return, they pay a fixed rate of interest
           and principal at maturity.
       3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?
        O  The Fund plans to hold to maturity 5 short-and
           intermediate-term U.S. Treasury notes with a current
           aggregate face amount of $49,200,000. The Fund is a unit
           investment trust which means that, unlike a mutual fund,
           the Fund's portfolio is not managed.
        o  You will periodically receive your share of the principal
           received as each Treasury note matures.
        o  The securities but not the Fund or the units are backed by
           the full faith and credit of the United States.
        o  100% of the Portfolio consists of United States government
           Treasury notes.

 

       4.  WHAT ARE THE SIGNIFICANT RISKS?
           YOU CAN LOSE MONEY BY INVESTING IN THE FUND. THIS CAN HAPPEN
           FOR VARIOUS REASONS, INCLUDING:
        o  Rising interest rates can reduce the price of your units.
        o  Assuming no changes in interest rates, when you sell your
           units, they will generally be worth less than your cost
           because your cost included a sales fee.
        o  The Fund will receive early returns of principal if
           securities are sold before they mature. If this happens your
           income will decline and you may not be able to reinvest the
           money you receive at as high a yield or as long a maturity.
 
       5.  IS THIS FUND APPROPRIATE FOR YOU?
           Yes, if you want current monthly income exempt from state
           and local personal income taxes in all states. You will
           benefit from a professionally selected and supervised
           portfolio of U.S. government backed securities.
           The Fund is not appropriate for you if you want a
           speculative investment that changes to take advantage of
           market movements.

 
           DEFINING YOUR INCOME
 
           WHAT YOU MAY EXPECT (Payable on the 25th day each month):
 

           Regular Monthly Income per 1,000 units:           $    5.72
           Annual Income per 1,000 units:                    $   68.74
           RECORD DAY: 10th day of each month
           These figures are estimates on the evaluation date; actual
           payments may vary.

 

       6.  WHAT ARE THE FUND'S FEES AND EXPENSES?
           This table shows the costs and expenses you may pay,
           directly or indirectly, when you invest in the Fund.

 

           INVESTOR FEES
                                                                2.25%
           Maximum Sales Fee (Load) on new purchases (as a
           percentage of $1,000 invested)

 

           Employees of some of the Sponsors and their affiliates may
           be charged a reduced sales fee of no less than $5.00 per
           1,000 Units.
           The maximum sales fee is reduced if you invest at least
           $500,000, as follows:

 

                                                     YOUR MAXIMUM
                                                        SALES FEE
                     IF YOU INVEST:                      WILL BE:
           -----------------------------------  -------------------------
           Less than $500,000                                2.25%
           $500,000-$999,999                                 1.75%
           $1,000,000 and over                               1.25%
 
           Maximum Exchange Fee                              1.25%

 
           ESTIMATED ANNUAL FUND OPERATING EXPENSES
 

                                                        AMOUNT
                                                           PER
                                                    1,000 UNITS
                                                    -----------
                                                     $    0.48
           Trustee's Fee
                                                     $    0.36
           Portfolio Supervision,
           Bookkeeping and
           Administrative Fees
                                                     $    0.03
           Evaluator's Fee
                                                     $    0.14
           Other Operating Expenses
                                                    -----------
                                                     $    1.01
           TOTAL

 
                                       3
<PAGE>
 

       7.  IS THE FUND MANAGED?
           Unlike a mutual fund, the Fund is not managed and securities
           are not sold because of market changes. Rather, experienced
           Defined Asset Funds financial analysts regularly review the
           securities in the Fund. The Fund may sell a security if
           certain adverse credit or other conditions exist.
       8.  HOW DO I BUY UNITS?
           The minimum investment is $250.
           You can buy units from any of the Sponsors and other
           broker-dealers. The Sponsors are listed later in this
           prospectus. Some banks may offer units for sale through
           special arrangements with the Sponsors, although certain
           legal restrictions may apply.
           UNIT PRICE PER 1,000 UNITS            $1,109.40
           (as of October 31, 1998)
           Unit price is based on the net asset value of the Fund plus
           the up-front sales fee. An amount equal to any principal
           cash, as well as net accrued but undistributed interest on
           the unit, is added to the unit price. An independent
           evaluator prices the bonds at 3:30 p.m. Eastern time every
           business day. Unit price changes every day with changes in
           the prices of the bonds in the Fund.
       9.  HOW DO I SELL UNITS?
           You may sell your units at any time to any Sponsor or the
           Trustee for the net asset value determined at the close of
           business on the date of sale. You will not pay any other fee
           when you sell your units.
 
      10.  HOW ARE DISTRIBUTIONS MADE AND TAXED?
           The Fund pays income monthly. Interest on the bonds in this
           Fund is subject to federal income taxes for U.S. investors,
           but exempt from state and local personal income taxes. If
           you are a non-U.S. investor, your interest may be exempt
           from U.S. federal income taxes, including withholding taxes.
           You will also receive principal payments when the securities
           mature or if they are sold (when the cash available is more
           than $5.00 per 1,000 units. You will be subject to tax on
           any gain realized by the Fund on the disposition of bonds.
      11.  WHAT OTHER SERVICES ARE AVAILABLE?
           EXCHANGE PRIVILEGES
           You may exchange units of this Fund for units of certain
           other Defined Asset Funds. You may also exchange into this
           Fund from certain other funds. We charge a reduced sales fee
           on exchanges.
           REINVESTMENT
           You will receive your monthly income in cash unless you
           choose to compound your income by reinvesting into
           additional units of the Fund at a reduced sales fee. Contact
           your broker, dealer or financial institution.

 
                                       4
<PAGE>
WHAT YOU CAN EXPECT FROM YOUR INVESTMENT
 
MONTHLY INCOME
 
The Fund will pay you regular monthly income. Your monthly income may vary
because of:
   o elimination of one or more securities from the Fund's portfolio because of
      redemptions or sales; or
   o a change in the Fund's expenses;
 
Changes in interest rates generally will not affect your monthly income because
the portfolio is fixed.
 
Along with your monthly income, you will receive your share of any available
principal.
 
RETURN FIGURES
 
We cannot predict your actual return, which will vary with unit price, how long
you hold your investment and changes in the portfolio, interest income and
expenses.
 
Estimated Current Return equals the estimated annual cash to be received from
the securities in the Fund less estimated annual Fund expenses, divided by the
Unit Price (including the maximum sales fee):
 

 Estimated Annual                  Estimated
 Interest Income        -       Annual Expenses
- -------------------------------------------------
                   Unit Price

 
Estimated Long Term Return is a measure of the estimated return over the
estimated life of the Fund. Unlike Estimated Current Return, Estimated Long Term
Return reflects maturities, discounts and premiums of the securities in the
Fund. It is an average of the yields to maturity of the individual securities in
the portfolio, adjusted to reflect the Fund's maximum sales fee and estimated
expenses. We calculate the average yield for the portfolio by weighting each
security's yield by its market value and the time remaining to the maturity
date.
 
Yields on individual securities depend on many factors including general
conditions of the bond markets, the size of a particular offering and the
maturity and quality rating of the particular issues. Yields can vary among
bonds with similar maturities, coupons and ratings.
 
These return quotations are designed to be comparative rather than predictive.
 
RECORDS AND REPORTS
 
You will receive:
o a monthly statement of income payments and any principal payments;
o a notice from the Trustee when new securities are deposited in exchange or
   substitution for securities originally deposited;
o an annual report on Fund activity; and
o annual tax information. This will also be sent to the IRS. You must report the
  amount of interest received during the year.
 
You may request:
o copies of evaluations to enable you to comply with federal and state tax
  reporting requirements; and
o audited financial statements of the Fund.
 
You may inspect records of Fund transactions at the Trustee's office during
regular business hours.
 
                                       5
<PAGE>
THE RISKS YOU FACE
 
INTEREST RATE RISK
 
Investing involves risks, including the risk that your investment will decline
in value if interest rates rise. Generally, securities with longer maturities
will change in value more than securities with shorter maturities. Of course, we
cannot predict how interest rates may change.
 
REDUCED DIVERSIFICATION RISK
 
If many investors sell their units, the Fund will have to sell securities. This
could reduce the diversification of your investment and increase your share of
Fund expenses.
 
LITIGATION RISK
 
We do not know of any pending litigation that might have a material adverse
effect upon the Fund.
 
SELLING OR EXCHANGING UNITS
 
You can sell your units at any time for a price based on net asset value. Your
net asset value is calculated each business day by:
   o adding the value of the securities, net accrued interest, cash and any
     other Fund assets;
   o subtracting accrued but unpaid Fund expenses, unreimbursed Trustee
      advances, cash held to buy back units or for distribution to investors and
     any other Fund liabilities; and
   o dividing the result by the number of outstanding units.
 
Your net asset value when you sell may be more or less than your cost because of
sales fees, market movements and changes in the portfolio.
 
SPONSORS' SECONDARY MARKET
 
While we are not obligated to do so, we will buy back units at net asset value
without any other fee or charge. We may resell the units to other buyers or to
the Trustee. You should consult your financial professional for current market
prices to determine if other broker-dealers or banks are offering higher prices.
 
We have maintained a secondary market continuously for over 25 years, but we
could discontinue it without prior notice for any business reason.
 
SELLING UNITS TO THE TRUSTEE
 
Regardless of whether we maintain a secondary market, you can sell your units to
the Trustee at any time by sending the Trustee a letter (with any outstanding
certificates if you hold Unit certificates). You must properly endorse your
certificates (or execute a written transfer instrument with signatures
guaranteed by an eligible institution). Sometimes, additional documents are
needed such as a trust document, certificate of corporate authority, certificate
of death or appointment as executor, administrator or guardian.
 
Within seven days after your request and the necessary documents are received,
the Trustee will mail a check to you. Contact the Trustee for additional
information.
 
As long as we are maintaining a secondary market, the Trustee will sell your
units to us at a price based on net asset value. If there is no secondary
market, the Trustee may sell your units in the over-the-counter market for a
higher price, but it is not obligated to do so. In that case, you will receive
the net proceeds of the sale.
 
                                       6
<PAGE>
If the Fund does not have cash available to pay you for units you are selling,
the agent for the Sponsors will select securities to be sold. Securities will be
selected based on market and credit factors. These sales could be made at times
when the securities would not otherwise be sold and may result in your receiving
less than the unit par value and also reduce the size and diversity of the Fund.
 
There could be a delay in paying you for your units:
   o if the New York Stock Exchange is closed (other than customary weekend and
      holiday closings);
   o if the SEC determines that trading on the New York Stock Exchange is
     restricted or that an emergency exists making sale or evaluation of the
     bonds not reasonably practicable; and
   o for any other period permitted by SEC order.
 
EXCHANGE OPTION
 
You may exchange units of certain Defined Asset Funds for units of this Fund at
a maximum exchange fee of      %. You may exchange units of this Fund for units
of certain other funds at a reduced sales fee if your investment goals change.
To exchange units, you should talk to your financial professional about what
funds are exchangeable, suitable and currently available.
 
Normally, an exchange is taxable and you must recognize any gain or loss on the
exchange. However, the IRS may try to disallow a loss if the portfolios of the
two funds are not materially different; you should consult your own tax adviser.
 
We may amend or terminate this exchange option at any time without notice.
 
HOW THE FUND WORKS
 
PRICING
 
The price of a unit includes interest accrued on the securities, less expenses,
from the most recent Record Day up to, but not including, the settlement date,
which is usually three business days after the purchase date of the unit.
 
A portion of the price of a unit consists of cash so that the Trustee can
provide you with regular monthly income. When you sell your units you will
receive your share of this cash.
 
In addition, as with mutual funds, the Fund (and therefore the investors) pay
all or some of the costs of organizing the Fund including:
   o cost of initial preparation of legal documents;
   o federal and state registration fees;
   o initial fees and expenses of the Trustee;
   o initial audit; and
   o legal expenses and other out-of-pocket expenses.
 
EVALUATIONS
 
An independent Evaluator values the securities on each business day (excluding
Saturdays, Sundays and the following holidays as observed by the New York Stock
Exchange: New Year's Day, Presidents' Day, Martin Luther King, Jr. Day, Good
Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and Christmas;
and the following federal holidays: Columbus Day and Veterans Day). Values are
based on current bid or offer prices for the securities or
 
                                       7
<PAGE>
comparable bonds. In the past, the difference between bid and offer prices of
U.S. Treasury securities of the type in this Fund has been about 0.10%.
 
INCOME
 
The Trustee credits interest to an Income Account and other receipts to a
Capital Account. The Trustee may establish a Reserve Account by withdrawing from
these accounts amounts it considers appropriate to pay any material liability.
These accounts do not bear interest.
 
EXPENSES
 
The Trustee is paid monthly. It also benefits when it holds cash for the Fund in
non-interest bearing accounts. The Trustee may also receive additional amounts:
   o to reimburse the Trustee for the Fund's operating expenses;
   o for extraordinary services and costs of indemnifying the Trustee and the
      Sponsors;
   o costs of actions taken to protect the Fund and other legal fees and
     expenses;
   o expenses for keeping the Fund's registration statement current; and
   o Fund termination expenses and any governmental charges.
 
The Sponsors are currently reimbursed up to 45 cents per $1,000 face amount
annually for providing portfolio supervisory, bookkeeping and administrative
services and for any other expenses properly chargeable to the Fund. While this
fee may exceed the amount of these costs and expenses attributable to this Fund,
the total of these fees for all Series of Defined Asset Funds will not exceed
the aggregate amount attributable to all of these Series for any calendar year.
The Fund also pays the Evaluator's fees.
 
The Trustee's, Sponsors' and Evaluator's fees may be adjusted for inflation
without investors' approval.
 
The Sponsors will pay advertising and selling expenses at no charge to the Fund.
If Fund expenses exceed initial estimates, the Fund will owe the excess. The
Trustee has a lien on Fund assets to secure reimbursement of Fund expenses and
may sell bonds if cash is not available.
 
PORTFOLIO CHANGES
 
The Sponsors and Trustee are not liable for any default or defect in a security.
 
Unlike a mutual fund, the portfolio is designed to remain intact and we may keep
securities in the portfolio even if their credit quality declines or other
adverse financial circumstances occur. However, we may sell a security in
certain cases if we believe that certain adverse credit or certain other
conditions exist.
 
If we maintain a secondary market in units but are unable to sell the units that
we buy in the secondary market, we will redeem units, which will affect the size
and composition of the portfolio. Units offered in the secondary market may not
represent the same face amount of securities that they did originally.
 
We decide whether or not to offer units for sale that we acquire in the
secondary market after reviewing:
   o diversity of the portfolio;
   o size of the Fund relative to its original size;
   o ratio of Fund expenses to income;
 
                                       8
<PAGE>
   o current and long-term returns;
   o degree to which units may be selling at a premium over par; and
   o cost of maintaining a current prospectus.
 
FUND TERMINATION
 
The Fund will terminate following the stated maturity or sale of the last
security in the portfolio. The Fund may also terminate earlier with the consent
of investors holding 51% of the units or if total assets of the Fund have fallen
below 40% of the face amount of securities deposited. We will decide whether to
terminate the Fund early based on the same factors used in deciding whether or
not to offer units in the secondary market.
 
When the Fund is about to terminate you will receive a notice, and you will be
unable to sell your units after that time. On or shortly before termination, we
will sell any remaining securities, and you will receive your final
distribution. Any security that cannot be sold at a reasonable price may
continue to be held by the Trustee in a liquidating trust pending its final
sale.
 
You will pay your share of the expenses associated with termination, including
brokerage costs in selling securities. This may reduce the amount you receive as
your final distribution.
 
CERTIFICATES
 
Certificates for units are issued on request. You may transfer certificates by
complying with the requirements for redeeming certificates, described above. You
can replace lost or mutilated certificates by delivering satisfactory indemnity
and paying the associated costs.
 
TRUST INDENTURE
 
The Fund is a 'unit investment trust' governed by a Trust Indenture, a contract
among the Sponsors, the Trustee and the Evaluator, which sets forth their duties
and obligations and your rights. A copy of the Indenture is available to you on
request to the Trustee. The following summarizes certain provisions of the
Indenture.
 
The Sponsors and the Trustee may amend the Indenture without your consent:
   o to cure ambiguities;
   o to correct or supplement any defective or inconsistent provision;
   o to make any amendment required by any governmental agency; or
   o to make other changes determined not to be materially adverse to your best
     interest (as determined by the Sponsors).
Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.
 
The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
   o it fails to perform its duties and the Sponsors determine that its
     replacement is in your best interest; or
   o it becomes incapable of acting or bankrupt or its affairs are taken over by
      public authorities.
 
Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee without the consent of
investors. The resignation or removal of either becomes
 
                                       9
<PAGE>
effective when a successor accepts appointment. The Sponsors will try to appoint
a successor promptly; however, if no successor has accepted within 30 days after
notice of resignation, the resigning Trustee or Evaluator may petition a court
to appoint a successor.
 
Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
   o remove it and appoint a replacement Sponsor;
   o liquidate the Fund; or
   o continue to act as Trustee without a Sponsor.
 
Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as agent for the
Sponsors.
 
The Trust Indenture contains customary provisions limiting the liability of the
Trustee, the Sponsors and the Evaluator.
 
LEGAL OPINION
 
Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
special counsel for the Sponsors, has given an opinion that the units are
validly issued.
 
AUDITORS
 
Deloitte & Touche LLP, 2 World Financial Center, New York, New York 10281,
independent accountants, audited the Statement of Condition included in this
prospectus.
 
SPONSORS
 
The Sponsors are:
 
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED (a wholly-owned subsidiary of
Merrill Lynch & Co., Inc.)
P.O. Box 9051,
Princeton, NJ 08543-9051
 
SALOMON SMITH BARNEY INC. (an indirectly wholly-owned subsidiary of Citigroup
Inc.)
388 Greenwich Street--23rd Floor,
New York, NY 10013
 
DEAN WITTER REYNOLDS INC. (a principal operating subsidiary of Morgan Stanley
Dean Witter & Co.)
Two World Trade Center--59th Floor,
New York, NY 10048
PRUDENTIAL SECURITIES INCORPORATED (an
indirect wholly-owned subsidiary of the
Prudential Insurance Company of America)
One New York Plaza
New York, NY 10292
PAINEWEBBER INCORPORATED (a wholly-owned subsidiary of PaineWebber Group Inc.)
1285 Avenue of the Americas,
New York, NY 10019
 
Each Sponsor is a Delaware corporation and it, or its predecessor, has acted as
sponsor to many unit investment trusts. As a registered broker-dealer each
Sponsor buys and sells securities (including investment company shares) for
others (including investment companies) and participates as an underwriter in
various selling groups.
 
TRUSTEE
 
The Chase Manhattan Bank, Unit Investment Trust Departament, 4 New York
Plaza--6th Floor, New York, New York 10004, is the Trustee. It is supervised by
the Federal Deposit Insurance Corporation, the Board of Governors of the Federal
Reserve System and New York State banking authorities.
 
                                       10
<PAGE>
UNDERWRITERS' AND SPONSORS' PROFITS
 
Underwriters receive sales charges when they sell units. The Sponsors also
realized a profit or loss on the initial deposit of the securities. Any cash
made available by you to the Sponsors before the settlement date for those units
may be used in the Sponsors' businesses to the extent permitted by federal law
and may benefit the Sponsors.
 
In maintaining a secondary market, the Sponsors will also realize profits or
sustain losses in the amount of any difference between the prices at which they
buy units and the prices at which they resell or redeem them.
 
PUBLIC DISTRIBUTION
 
The Sponsors do not intend to qualify units for sale in any foreign countries.
This prospectus does not constitute an offer to sell units in any country where
units cannot lawfully be sold.
 
CODE OF ETHICS
 
Merrill Lynch, as agent for the Sponsors, has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its employees
with access to information on portfolio transactions. The goal of the code is to
prevent fraud, deception or misconduct against the Fund and to provide
reasonable standards of conduct.
 
YEAR 2000 ISSUES
 
Many computer systems were designed in such a way that they may be unable to
distinguish between the year 2000 and the year 1900 (commonly known as the 'Year
2000 Problem'). We do not expect that the computer system changes necessary to
prepare for the Year 2000 will cause any major operational difficulties for the
Fund.
 
TAXES
 
The following summary describes some of the important income tax consequences of
holding units. It assumes that you are not a dealer, financial institution,
insurance company or other investor with special circumstances. You should
consult your own tax adviser about your particular circumstances.
 
The Sponsors believe that individual investors will not be subject to any state
or local personal income taxes on interest received by the Fund. However, you
may be subject to state and local taxes on capital gains (or 'market discount'),
and possibly other state and local taxes on your units. Also, you probably will
not be entitled to a deduction for state and local tax purposes for your share
of fees and expenses paid by the Fund, for any amortized 'bond premium' or for
any interest on money borrowed to purchase your units. You should consult your
tax adviser in this regard.
 
In the opinion of our counsel, under existing law:
 
GENERAL TREATMENT OF THE FUND AND YOUR INVESTMENT
 
The Fund will not be taxed as a corporation for federal income tax purposes, and
you
will be considered to own directly your share of each security in the Fund.
 
INCOME OR LOSS UPON DISPOSITION
 
When all or part of your share of a security is disposed of (for example, when
the Fund sells,
 
                                       11
<PAGE>
exchanges or redeems a security or when you sell or exchange your units), you
will generally recognize capital gain or loss. Your gain, however, will
generally be ordinary income to the extent of any accrued 'market discount'.
Generally you will have market discount to the extent that your basis in a
security when you purchase a unit is less than its stated redemption price at
maturity (or, if it is an original issue discount security, the issue price
increased by original issue discount that has accrued on the security before
your purchase). You should consult your tax adviser in this regard.
 
If your net long-term capital gains exceed your net short-term capital losses,
the excess may be subject to tax at a lower rate than ordinary income. Any
capital gain from the Fund will be long-term if you are considered to have held
your investment on each security for more than one year and short-term if you
held it for one year or less. Because the deductibility of capital losses is
subject to limitations, you may not be able to deduct all of your capital
losses. You should consult your tax advisor in this regard.
 
YOUR BASIS IN THE SECURITIES
 
Your aggregate basis in the securities will be equal to the cost of your units,
including any sales charges and the organizational expenses you pay, adjusted to
reflect any accruals of 'original issue discount,' 'acquisition premium' and
'bond premium'. You should consult your tax adviser in this regard.
 
EXPENSES
 
If you are an individual who itemizes deductions, you may deduct your share of
Fund expenses, but only to the extent that such amount, together with your other
miscellaneous deductions, exceeds 2% of your adjusted gross income. Your ability
to deduct Fund expenses will be limited further if your adjusted gross income
exceeds a specified amount (for 1998, $124,500 or $62,250 for a married person
filing separately).
 
FOREIGN INVESTORS
 
If you are a foreign investor and you are not engaged in a U.S. trade or
business, you generally will not be subject to U.S. federal income tax,
including withholding tax, on the interest or gain on a security issued after
July 18, 1984 if you meet certain requirements, including the certification of
foreign status and other matters. You should consult your tax adviser about the
possible application of federal, state and local, and foreign taxes.
 
RETIREMENT PLANS
 
You may wish to purchase units for an Individual Retirement Account (IRA) or
other retirement plan. Generally, capital gains and income received in each of
these plans are exempt from such plans are generally treated as ordinary income
but may, in some cases, be eligible for tax-deferred rollover treatment. You
should consult your attorney or tax adviser about the specific tax rules
relating to these plans. These plans are offered by brokerage firms, including
the Sponsors of this Fund, and other financial institutions. Fees and charges
with respect to such plans may vary.
 
SUPPLEMENTAL INFORMATION
 
You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information
 
                                       12
<PAGE>
includes more detailed risk disclosure about the securities that may be in the
Fund's portfolio and general information about the structure and operation of
the Fund. The supplemental information is also available from the SEC.
 
                                       13




<PAGE>

THE GOVERNMENT SECURITIES INCOME FUND,
MONTHLY PAYMENT U.S. TREASURY SERIES - 21 (LADDERED MATURITIES),
DEFINED ASSET FUNDS

REPORT OF INDEPENDENT ACCOUNTANTS



The Sponsors, Trustee and Holders
  of The Government Securities Income Fund,
  Monthly Payment U.S. Treasury Series - 21 (Laddered Maturities),
  Defined Asset Funds:

We have audited the accompanying statement of condition of The Government
Securities Income Fund, Monthly Payment U.S. Treasury Series - 21 (Laddered
Maturities), Defined Asset Funds, including the portfolio, as of October 31,
1998 and the related statements of operations and of changes in net assets for
the years ended October 31, 1998, 1997 and 1996.  These financial statements are
the responsibility of the Trustee.  Our responsibility is to express an opinion
on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  Securities owned at
October 31, 1998, as shown in such portfolio, were confirmed to us by The Chase
Manhattan Bank, the Trustee.  An audit also includes assessing the accounting
principles used and significant estimates made by the Trustee, as well as
evaluating the overall financial statement presentation.  We believe that our
audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of The Government Securities
Income Fund, Monthly Payment U.S. Treasury Series - 21 (Laddered Maturities),
Defined Asset Funds at October 31, 1998 and the results of its operations and
changes in its net assets for the above-stated years in conformity with
generally accepted accounting principles.




DELOITTE & TOUCHE LLP

New York, N.Y.

                                       D-1

<PAGE>
THE GOVERNMENT SECURITIES INCOME FUND,
MONTHLY PAYMENT U.S. TREASURY SERIES - 21 (LADDERED MATURITIES),
DEFINED ASSET FUNDS

STATEMENT OF CONDITION
AS OF OCTOBER 31, 1998

<TABLE>
<CAPTION>

TRUST PROPERTY:
<S>                                                       <C>            <C>
  Investment in marketable securities - at value
    (cost $48,832,421) (Note 1)                                          $53,354,340
  Accrued interest receivable                                              1,152,134
  Proceeds receivable for sales of securities.                               135,695

            Total trust property                                          54,642,169

LESS LIABILITIES:
  Advance from Trustee                                     $   257,550
  Accrued expenses                                              16,285
  Redemptions payable                                          137,928       411,763

NET ASSETS, REPRESENTED BY:
  49,200,000 units of fractional undivided interest
    outstanding (Note 3)                                    53,354,340
  Undistributed net investment income                          876,066   $54,230,406

UNIT VALUE ($54,230,406/49,200,000 units)                                   $1.10224

</TABLE>

                              See Notes to Financial Statements.




                                              D-2

<PAGE>
THE GOVERNMENT SECURITIES INCOME FUND,
MONTHLY PAYMENT U.S. TREASURY SERIES - 21 (LADDERED MATURITIES),
DEFINED ASSET FUNDS

STATEMENTS OF OPERATIONS


<TABLE>
<CAPTION>
                                                            Years Ended October 31,
                                                         1998         1997         1996

<S>                                                   <C>          <C>          <C>
INVESTMENT INCOME:
  Interest income                                     $3,644,846   $4,159,134   $4,812,844
  Trustee's fees and expenses                            (31,657)     (37,783)     (44,654)
  Organizational expenses                                 (2,795)
  Sponsors' fees                                         (17,081)     (17,375)     (10,273)

  Net investment income                                3,593,313    4,103,976    4,757,917

REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
  Realized gain on securities sold                       606,824      660,663    1,076,225
  Unrealized appreciation (depreciation)
    of investments                                     1,181,117     (241,893)  (2,348,923)

  Realized and unrealized gain (loss) on
    investments                                        1,787,941      418,770   (1,272,698)

NET INCREASE IN NET ASSETS RESULTING FROM
  OPERATIONS                                          $5,381,254   $4,522,746   $3,485,219


                              See Notes to Financial Statements.




</TABLE>
                                              D-3

<PAGE>
THE GOVERNMENT SECURITIES INCOME FUND,
MONTHLY PAYMENT U.S. TREASURY SERIES - 21 (LADDERED MATURITIES),
DEFINED ASSET FUNDS

STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                           Years Ended October 31,
                                                      1998          1997          1996


<S>                                                <C>           <C>           <C>
OPERATIONS:
  Net investment income                            $ 3,593,313   $ 4,103,976   $ 4,757,917
  Realized gain on securities sold                     606,824       660,663     1,076,225
  Unrealized appreciation (depreciation) of
    investments                                      1,181,117      (241,893)  (2,348,923)

  Net increase in net assets resulting from
    operations                                       5,381,254     4,522,746     3,485,219

INCOME DISTRIBUTIONS TO HOLDERS (Note 2)           (3,595,749)   (4,116,003)   (4,777,587)

CAPITAL SHARE TRANSACTIONS:
  Redemptions of 6,075,000, 8,900,000, and
    11,125,000 units, respectively                  (6,511,158)  (9,313,010)   (11,831,498)

NET DECREASE IN NET ASSETS                          (4,725,653)   (8,906,267)  (13,123,866)

NET ASSETS AT BEGINNING OF YEAR                     58,956,059    67,862,326    80,986,192

NET ASSETS AT END OF YEAR                          $54,230,406   $58,956,059   $67,862,326

PER UNIT:
  Income distributions during year                    $0.06872      $0.06878      $0.06900

  Net asset value at end of year                      $1.10224      $1.06660      $1.05746

TRUST UNITS OUTSTANDING AT END OF YEAR              49,200,000    55,275,000    64,175,000



                              See Notes to Financial Statements.




</TABLE>
                                              D-4

<PAGE>
THE GOVERNMENT SECURITIES INCOME FUND,
MONTHLY PAYMENT U.S. TREASURY SERIES - 21 (LADDERED MATURITIES),
DEFINED ASSET FUNDS

NOTES TO FINANCIAL STATEMENTS


1.   SIGNIFICANT ACCOUNTING POLICIES

     The Fund is registered under the Investment Company Act of 1940 as a Unit
     Investment Trust.  The following is a summary of significant accounting
     policies consistently followed by the Fund in the preparation of its
     financial statements.  The policies are in conformity with generally
     accepted accounting principles.

(a)  Securities are stated at value as determined by the Evaluator based on
     bid side evaluations for the securities (see "How to Sell Units -
     Trustee's Redemption of Units" in this Prospectus, Part B).  Gains or
     losses on sales of securities are computed using the first-in, first-
     out method.

(b)  The Fund is not subject to income taxes.  Accordingly, no provision
     for such taxes is required.

(c)  Interest income is recorded as earned.

2.   DISTRIBUTIONS

     Net investment income is distributed to Holders each month.  Receipts other
     than interest, after deductions for redemptions and applicable expenses,
     are distributed as explained in "Income and Distributions - Distributions"
     in this Prospectus, Part B.

3.   NET CAPITAL

       Cost of 49,200,000 units at Dates of Deposit                 $49,829,001
       Less sales charge                                                996,580
       Net amount applicable to Holders                              48,832,421
       Redemptions of units - net cost of 30,700,000 units
         redeemed less redemption amounts                            (2,767,830)
       Realized gain on securities sold or redeemed                   2,767,830
       Unrealized appreciation of investments                         4,521,919

       Net capital applicable to Holders                            $53,354,340

4.   INCOME TAXES

     All fund items of income received, expenses paid, and realized gains and
     losses on securities sold are attributable to the Holders, on a pro rata
     basis, for Federal income tax purposes in accordance with the grantor trust
     rules of the United States Internal Revenue Code.

     At October 31, 1998, the cost of investment securities for Federal income
     tax purposes was approximately equivalent to the cost as shown in the
     Fund's portfolio.




                                    D-5

<PAGE>
THE GOVERNMENT SECURITIES INCOME FUND,
MONTHLY PAYMENT U.S. TREASURY SERIES - 21 (LADDERED MATURITIES),
DEFINED ASSET FUNDS

PORTFOLIO
AS OF OCTOBER 31, 1998
<TABLE>
<CAPTION>


       Portfolio No. and Title of             Face        Interest
               Securities                    Amount         Rate       Maturities        Cost(1)        Value(1)

<S>                                        <C>             <C>          <C>            <C>            <C>
1.   United States Treasury Notes          $9,840,000      6.375%       01/15/00       $9,579,159     $10,704,080

2.   United States Treasury Notes           9,840,000      7.500        11/15/01       10,038,964      10,827,080

3.   United States Treasury Notes           9,840,000      7.500        05/15/02       10,054,222      10,061,400

4.   United States Treasury Notes           9,840,000      6.250        02/15/03        9,292,697      10,553,400

5.   United States Treasury Notes           9,840,000      7.250        08/15/04        9,867,379      11,208,380

TOTAL                                     $49,200,000                                  $48,832,421    $53,354,340


(1)  See Note 1 to Financial Statements.




</TABLE>
                                              D-6

<PAGE>
                             Defined
                             Asset FundsSM
 

HAVE QUESTIONS ?                         GOVERNMENT SECURITIES INCOME FUND
Request the most recent free             MONTHLY PAYMENT U.S TREASURY SERIES--21
Information Supplement                   (LADDERED MATURITIES)
that gives more details about            (A Unit Investment Trust)
the Fund, by calling:                    ---------------------------------------
The Chase Manhattan Bank                 This Prospectus does not contain
1-800-323-1508                           complete information about the
                                         investment company filed with the
                                         Securities and Exchange Commission in
                                         Washington, D.C. under the:
                                         o Securities Act of 1933 (file no.
                                         33-55247) and
                                         o Investment Company Act of 1940 (file
                                         no. 811-2810).
                                         TO OBTAIN COPIES AT PRESCRIBED RATES--
                                         WRITE: Public Reference Section of the
                                         Commission
                                         450 Fifth Street, N.W., Washington,
                                         D.C. 20549-6009
                                         CALL: 1-800-SEC-0330.
                                         VISIT: http://www.sec.gov.
                                         ---------------------------------------
                                         No person is authorized to give any
                                         information or representations about
                                         this Fund not contained in this
                                         Prospectus or the Information
                                         Supplement, and you should not rely on
                                         any other information.
                                         ---------------------------------------
                                         When units of this Fund are no longer
                                         available, this Prospectus may be used
                                         as a preliminary prospectus for a
                                         future series, but some of the
                                         information in this Prospectus will be
                                         changed for that series.
                                         Units of any future series may not be
                                         sold nor may offers to buy be accepted
                                         until that series has become effective
                                         with the Securities and Exchange
                                         Commission. No units can be sold in any
                                         State where a sale would be illegal.

 
                                                      14995--1/99


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