MUNICIPAL INVESTMENT TR FD INTERM TERM SER 312 DEF ASSET FDS
497, 2000-05-22
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                           DEFINED ASSET FUNDS--REGISTERED TRADEMARK--
                           ----------------------------------------------------

                           MUNICIPAL INVESTMENT TRUST FUND
                           INTERMEDIATE TERM SERIES--312
                           (A UNIT INVESTMENT TRUST)
                           -  PORTFOLIO OF SHORT-INTERMEDIATE TERM MUNICIPAL
                              BONDS
                           -  DESIGNED FOR INCOME FREE FROM REGULAR FEDERAL
                              INCOME TAX
                           -  MONTHLY INCOME DISTRIBUTIONS

SPONSORS:
MERRILL LYNCH,             -----------------------------------------------------
PIERCE, FENNER & SMITH     The Securities and Exchange Commission has not
INCORPORATED               approved or disapproved these Securities or passed
SALOMON SMITH BARNEY INC.  upon the adequacy of this prospectus. Any
PAINEWEBBER INCORPORATED   representation to the contrary is a criminal offense.
DEAN WITTER REYNOLDS INC.  Prospectus dated May 19, 2000.

<PAGE>
- --------------------------------------------------------------------------------

Defined Asset Funds--Registered Trademark--
Defined Asset Funds-Registered Trademark- is America's oldest and largest family
of unit investment trusts, with over $160 billion sponsored over the last 28
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:
  - A disciplined strategy of buying and holding with a long-term view is the
    cornerstone of Defined Asset Funds.
  - Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
    funds are not managed and portfolio changes are limited.
  - Defined Portfolios: We choose the stocks and bonds in advance, so you know
    what you're investing in.
  - Professional research: Our dedicated research team seeks out stocks or bonds
    appropriate for a particular fund's objectives.
  - 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,
JANUARY 31, 2000.

<TABLE>
<S>                                    <C>
CONTENTS
                                       PAGE
                                       ----
Risk/Return Summary..................     3
What You Can Expect From Your
  Investment.........................     7
  Monthly Income.....................     7
  Return Figures.....................     7
  Records and Reports................     7
The Risks You Face...................     8
  Interest Rate Risk.................     8
  Call Risk..........................     8
  Reduced Diversification Risk.......     8
  Liquidity Risk.....................     8
  Concentration Risk.................     8
  Bond Quality Risk..................     9
  Insurance Related Risk.............     9
  Litigation and Legislation Risks...     9
Selling or Exchanging Units..........    10
  Sponsors' Secondary Market.........    10
  Selling Units to the Trustee.......    10
  Exchange Option....................    11
How The Fund Works...................    11
  Pricing............................    11
  Evaluations........................    11
  Income.............................    12
  Expenses...........................    12
  Portfolio Changes..................    12
  Fund Termination...................    13
  Certificates.......................    13
  Trust Indenture....................    13
  Legal Opinion......................    14
  Auditors...........................    14
  Sponsors...........................    14
  Trustee............................    14
  Underwriters' and Sponsors'
    Profits..........................    15
  Public Distribution................    15
  Code of Ethics.....................    15
  Year 2000 Issues...................    15
Taxes................................    15
Supplemental Information.............    17
Financial Statements.................   D-1
</TABLE>

                                       2
<PAGE>
- --------------------------------------------------------------------------------

RISK/RETURN SUMMARY

<TABLE>
<C>  <S>
 1.  WHAT IS THE FUND'S OBJECTIVE?
     The Fund seeks interest income that is
     exempt from regular federal income taxes
     by investing in a fixed portfolio
     consisting primarily of municipal
     revenue bonds with an estimated average
     life of 4 years.

 2.  WHAT ARE MUNICIPAL REVENUE BONDS?
     Municipal revenue bonds are bonds issued
     by states, municipalities and public
     authorities to finance the cost of
     buying, building or improving various
     projects intended to generate revenue,
     such as airports, health care
     facilities, housing and municipal
     electric, water and sewer utilities.
     Generally, payments on these bonds
     depend solely on the revenues generated
     by the projects, excise taxes or state
     appropriations, and are not backed by
     the government's taxing power.

 3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?

  -  The Fund plans to hold to maturity 16
     short-intermediate term tax-exempt
     municipal bonds with a current aggregate
     face amount of $11,515,000.
  -  The Fund is a unit investment trust
     which means that, unlike a mutual fund,
     the Fund's portfolio is not managed.
  -  When the bonds were initially deposited
     (February 6, 1998), they were rated A or
     better by Standard & Poor's, Moody's or
     Fitch, or in the opinion of the agent
     for the Sponsors had similar credit
     quality to bonds rated A or better. THE
     CREDIT QUALITY OF THE BONDS MAY
     CURRENTLY BE LOWER.
  -  Many of the bonds can be called at a
     premium declining over time to par
     value. Some bonds may be called earlier
     at par for extraordinary reasons.
  -  12% of the bonds are backed by bank
     letters of credit.
  -  25% of the bonds are insured by
     insurance companies.

     Letters of credit and insurance
     guarantee timely payments of principal
     and interest on the bonds (but not Fund
     units or the market value of the bonds
     before they mature).

     The Portfolio consists of municipal
     bonds of the following types:
</TABLE>

<TABLE>
  -  Cooperatives                              9%
<C>  <S>
  -  General Obligation                        4%
  -  Hospitals/Health Care                    37%
  -  Housing                                  25%
  -  Lease Rental                             10%
  -  Miscellaneous                             3%
  -  Refunded Bonds                          11%
  -  Special Tax                               1%
</TABLE>

<TABLE>
<C>  <S>
 4.  WHAT ARE THE SIGNIFICANT RISKS?

     YOU CAN LOSE MONEY BY INVESTING IN THE
     FUND. THIS CAN HAPPEN FOR VARIOUS
     REASONS, INCLUDING:
  -  Rising interest rates, an issuer's
     worsening financial condition or a drop
     in bond ratings can reduce the price of
     your units.
  -  Because the Fund is concentrated in
     hospital/health care and housing bonds,
     adverse developments in these sectors
     may affect the value of your units.
  -  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.
  -  The Fund will receive early returns of
     principal if bonds are called or 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.
</TABLE>

<TABLE>
<C>  <S>
 5.  IS THIS FUND APPROPRIATE FOR YOU?

     Yes, if you want monthly income free
     from regular federal income tax. You
     will benefit from a professionally
     selected and supervised portfolio whose
     risk is reduced by investing in bonds of
     several different issuers.
     The Fund is NOT appropriate for you if
     you want a speculative investment that
     changes to take advantage of market
     movements, if you do not want a
     tax-advantaged investment, if you are
     subject to AMT or if you cannot tolerate
     any risk.
</TABLE>

                                       3
<PAGE>

<TABLE>
<C>  <S>
     DEFINING YOUR INCOME
</TABLE>

<TABLE>
<C>  <S>                                            <C>
     WHAT YOU MAY EXPECT (PAYABLE ON THE 25TH DAY
     OF EACH MONTH):
     Regular Monthly Income per unit                 $ 3.69
     Annual Income per unit                          $44.31
     RECORD DAY: 10th day of each month

     THESE FIGURES ARE ESTIMATES ON THE EVALUATION DATE;
     ACTUAL PAYMENTS MAY VARY.
</TABLE>

<TABLE>
<C>  <S>
 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

     Maximum Sales Fee (Load) on new
     purchases (as a percentage of $1,000
     invested)                                 2.50%
     Employees of some of the Sponsors and
     their affiliates may be charged a
     reduced sales fee of no less than $5.00
     per unit.

     The maximum sales fee is reduced if you
     invest at least $100,000, as follows:
</TABLE>

<TABLE>
<CAPTION>
                               YOUR MAXIMUM
                                SALES FEE
          IF YOU INVEST:         WILL BE:
          --------------       ------------
<C>  <S>                       <C>
     Less than $100,000            2.50%
     $100,000 to $249,999          2.25%
     $250,000 to $499,999          2.00%
     $500,000 to $999,999          1.75%
     $1,000,000 and over           1.50%

     Maximum Exchange Fee          1.50%
</TABLE>

<TABLE>
                                                     $0.71
     Trustee's Fee
                                                     $0.56
     Portfolio Supervision,
     Bookkeeping and
     Administrative Fees
     (including updating
     expenses)
<CAPTION>
     ESTIMATED ANNUAL FUND OPERATING EXPENSES
                                                     AMOUNT
                                                    PER UNIT
                                                    --------
<C>  <S>                                           <C>
                                                     $0.11
     Evaluator's Fee
                                                     $0.20
     Organization Costs
                                                     $0.14
     Other Operating Expenses
                                                     -----
                                                     $1.72
     TOTAL
</TABLE>

<TABLE>
<C>  <S>
     The Sponsors historically paid organization
     costs and updating expenses.
</TABLE>

<TABLE>
<C>  <S>
 7.  HOW HAVE SIMILAR FUNDS PERFORMED IN THE
     PAST?

     IN THE FOLLOWING CHART WE SHOW PAST
     PERFORMANCE OF PRIOR SHORT-INTERMEDIATE
     SERIES, WHICH HAD THE SAME INVESTMENT
     OBJECTIVES, STRATEGIES AND TYPES OF
     BONDS AS THIS FUND. These prior
     Short-Intermediate Series were offered
     after 1987 and were outstanding on March
     31, 2000. OF COURSE, PAST PERFORMANCE OF
     PRIOR SERIES IS NO GUARANTEE OF FUTURE
     RESULTS OF THIS FUND.

     AVERAGE ANNUAL COMPOUND TOTAL RETURNS
     FOR PRIOR SERIES
     REFLECTING ALL EXPENSES. FOR PERIODS
     ENDED 3/31/00.
</TABLE>

<TABLE>
<CAPTION>
                          WITH SALES FEE       NO SALES FEE
                         1 YEAR   5 YEARS    1 YEAR   5 YEARS
 <S>                    <C>       <C>       <C>       <C>
 -------------------------------------------------------------
 High                     3.68     4.58%     4.65%     5.30%
 Average                  0.85      3.93      2.25      4.60
 Low                     -3.58      3.46     -1.15      4.10

<C>  <S>

<C>  <S>
     managed and bonds are not sold because of market
     changes. Rather, experienced Defined Asset Funds
     financial analysts regularly review the bonds in the
     Fund. The Fund may sell a bond if certain adverse
     credit or other conditions exist.

 9.  HOW DO I BUY UNITS?

     The minimum investment is one unit.

<C>  <S>
     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.
</TABLE>

                                       4
<PAGE>
<TABLE>
<C>  <S>
     UNIT PRICE PER UNIT               $1,000.97
     (as of January 31, 2000)

     Unit price is based on the net asset value of the Fund
     plus the 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.

10.  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.

11.  HOW ARE DISTRIBUTIONS MADE AND TAXED?

     The Fund pays income monthly. In the opinion of bond
     counsel when each bond was issued, interest on the
     bonds in this Fund is generally 100% exempt from
     regular federal income tax.
     Interest on approximately 28% of the bonds will be
     taken into account in determining your preference
     items for alternative minimum tax purposes. A portion
     of the income may also be exempt from state and local
     personal income taxes, depending on where you live.

     You will also receive principal payments if bonds are
     sold or called or mature, when the cash available is
     more than $5.00 per unit. You will be subject to tax
     on any gain realized by the Fund on the disposition of
     bonds.

12.  WHAT OTHER SERVICES ARE AVAILABLE?

     REINVESTMENT
     You will receive your monthly income in cash unless
     you choose to compound your income by reinvesting with
     no sales fee in the Municipal Fund Investment
     Accumulation Program, Inc. This program is an open-end
     mutual fund with a comparable investment objective.
     Income from this program will generally be subject to
     state and local income taxes. FOR MORE COMPLETE
     INFORMATION ABOUT THE PROGRAM, INCLUDING CHARGES AND
     FEES, ASK THE TRUSTEE FOR THE PROGRAM'S PROSPECTUS.
     READ IT CAREFULLY BEFORE YOU INVEST. THE TRUSTEE MUST
     RECEIVE YOUR WRITTEN ELECTION TO REINVEST AT LEAST 10
     DAYS BEFORE THE RECORD DAY OF AN INCOME PAYMENT.

     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.
</TABLE>

                                       5
<PAGE>
- --------------------------------------------------------------------------------
    TAX-FREE VS. TAXABLE INCOME: A COMPARISON OF TAXABLE AND TAX-FREE YIELDS

<TABLE>
                                      EFFECTIVE
TAXABLE INCOME 2000*                  % TAX                                  TAX-FREE YIELD OF
  SINGLE RETURN      JOINT RETURN     BRACKET      3%        3.5%        4%        4.5%        5%        5.5%        6%
                                                                    IS EQUIVALENT TO A TAXABLE YIELD OF
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$      0- 26,250   $      0- 43,850    15.00       3.53       4.12       4.71       5.29       5.88       6.47       7.06
- ---------------------------------------------------------------------------------------------------------------------------
$ 26,251- 63,550   $ 43,851-105,950    28.00       4.17       4.86       5.56       6.25       6.94       7.64       8.33
- ---------------------------------------------------------------------------------------------------------------------------
$ 63,551-132,600   $105,951-161,450    31.00       4.35       5.07       5.80       6.52       7.25       7.97       8.70
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
$132,601-288,350   $161,451-288,350    36.00       4.69       5.47       6.25       7.03       7.81       8.59       9.38
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
  OVER $288,350    OVER $288,350       39.60       4.97       5.79       6.62       7.45       8.28       9.11       9.93
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>

<S>                <C>
TAXABLE INCOME 20
  SINGLE RETURN     6.5%
                      IS
                   EQUIVALENT
                     TO A
                   TAXABLE
                   YIELD OF
- -----------------
$      0- 26,250     7.65
- -----------------
$ 26,251- 63,550     9.03
- -----------------
$ 63,551-132,600     9.42
                   --------
- -----------------
$132,601-288,350    10.16
                   --------
- -----------------
  OVER $288,350     10.76
                   --------
- -----------------
</TABLE>

To compare the yield of a taxable security with the yield of a federally
tax-free security, find your taxable income and read across. The table
incorporates 2000 federal income tax rates and assumes that all income would
otherwise be taxed at a U.S. investor's highest tax rate. Yield figures are for
example only.

*Based upon net amount subject to federal income tax after deductions and
exemptions. This table does not reflect the possible effect of other tax
factors, such as alternative minimum tax, personal exemptions, the phase-out of
exemptions, itemized deductions, the possible partial disallowance of deductions
or state and local taxation. Consequently, investors are urged to consult their
own tax advisers in this regard.

                MUNICIPAL BONDS AND THE ALTERNATIVE MINIMUM TAX

<TABLE>
       INCOME+             MAXIMUM "PREFERENCE" INCOME
                              WITHOUT TRIGGERING AMT
                             (STATE INCOME TAX RATES)
SINGLE ++   JOINT ++        0%          7%         11%
<S>         <C>         <C>         <C>         <C>
- ----------------------------------------------------------
            $50,000      $20,000     $15,000     $13,000
- ----------------------------------------------------------
$30,000                  $19,000     $16,000     $14,000
- ----------------------------------------------------------
            $100,000     $24,000     $15,000     $11,000
- ----------------------------------------------------------
$55,000                  $21,000     $16,000     $13,000
- ----------------------------------------------------------
            $225,000     $30,000     $12,000     $ 3,000
- ----------------------------------------------------------
$205,000                 $30,000     $14,000     $ 6,000
- ----------------------------------------------------------
</TABLE>

NOTES:
 + Regular taxable income plus state income taxes
   and personal exemptions.
 ++ Assuming no dependents.
Under federal tax law, interest income on certain municipal bonds, although
exempt from regular income tax, is treated as a "preference" item for purposes
of AMT. The table above shows amounts of such municipal bond "preference"
interest income, assuming no other "preference" or similar items apply, that
individual taxpayers could receive in 2000 without becoming subject to the AMT.
The table gives information for single and joint returns of U.S. individuals
having no dependents. The table provides three income levels and three
hypothetical state income tax rates. The table further assumes that the stated
amount of municipal bond 'preference' interest income is subject to state income
taxes.

                                       6
<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:
  - elimination of one or more bonds from the Fund's portfolio because of calls,
    redemptions or sales;
  - a change in the Fund's expenses; or
  - the failure by a bond's issuer to pay interest.

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
bond 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 bonds in the Fund less estimated annual Fund expenses, divided by the Unit
Price (including the maximum sales fee):

<TABLE>
<S>              <C>  <C>
Estimated Annual         Estimated
Interest Income   -   Annual Expenses
- -------------------------------------
             Unit Price
</TABLE>

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 bonds in the Fund. It
is an average of the yields to maturity (or in certain cases, to an earlier call
date) of the individual bonds 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 bond's yield by its market value and the time
remaining to the call or maturity date.

Yields on individual bonds 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:
- - a monthly statement of income payments and any principal payments;
- - a notice from the Trustee when new bonds are deposited in exchange or
  substitution for bonds originally deposited;
- - an annual report on Fund activity; and
- - annual tax information. THIS WILL ALSO BE SENT TO THE IRS. YOU MUST REPORT THE
  AMOUNT OF TAX-EXEMPT INTEREST RECEIVED DURING THE YEAR.

You may request:
- - copies of bond evaluations to enable you to comply with federal and state tax
  reporting requirements; and
- - audited financial statements of the Fund.

You may inspect records of Fund transactions at the Trustee's office during
regular business hours.

                                       7
<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, bonds with longer maturities will
change in value more than bonds with shorter maturities. Bonds in the Fund are
more likely to be called when interest rates decline. This would result in early
returns of principal to you and may result in early termination of the Fund. Of
course, we cannot predict how interest rates may change.

CALL RISK

Many bonds can be prepaid or "called" by the issuer before their stated
maturity. For example, some bonds may be required to be called pursuant to
mandatory sinking fund provisions.

Also, an issuer might call its bonds during periods of falling interest rates,
if the issuer's bonds have a coupon higher than current market rates.

An issuer might call its bonds in extraordinary cases, including if:
  - it no longer needs the money for the original purpose;
  - the project is condemned or sold;
  - the project is destroyed and insurance proceeds are used to redeem the
    bonds;
  - any related credit support expires and is not replaced; or
  - interest on the bonds become taxable.

If the bonds are called, 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. An
early call at par of a premium bond will reduce your return.

REDUCED DIVERSIFICATION RISK

If many investors sell their units, the Fund will have to sell bonds. This could
reduce the diversification of your investment and increase your share of Fund
expenses.

LIQUIDITY RISK

The bonds will generally trade in the over-the-counter market. We cannot assure
you that a liquid trading market will exist, especially since current law may
restrict the Fund from selling bonds to any Sponsor. The value of the bonds, and
of your investment, may be reduced if trading in bonds is limited or absent.

CONCENTRATION RISK

When a certain type of bond makes up 25% or more of the portfolio, the Fund is
said to be "concentrated" in that bond type, which makes the Fund less
diversified.

Here is what you should know about the Fund's concentration in housing bonds.
Multi-family housing revenue bonds and single family mortgage revenue bonds are
issued to provide financing for various housing projects. These bonds are
payable primarily from the revenue derived from mortgage loans to housing
projects for low to moderate income familities or notes secured by mortgages on
residences. Repayment of these bonds is dependent upon, among other things:
  - occupany levels;
  - rental income;
  - the default rate on the underlying mortgage loans;
  - the ability of mortgage insurers to pay claims;
  - the continued availability of federal, state or local housing subsidiary
    programs;
  - economic conditions in local markets;

                                       8
<PAGE>
  - construction costs;
  - taxes;
  - utility costs;
  - the level of operating expenses; and
  - the managerial ability of project managers.

Housing bonds generally may be prepaid at any time. Therefore, their average
life will ordinarily be less then their stated maturity.

Here is what you should know about the Fund's concentration in hospital and
health care bonds:
  - payment for these bonds depends on revenues from private third-party payors
    and government programs, including Medicare and Medicaid, which have
    generally undertaken cost containment measures to limit payments to health
    care providers;
  - hospitals face increasing competition resulting from hospital mergers and
    affiliations;
  - hospitals need to reduce costs as HMOs increase market penetration and
    hospital supply and drug companies raise prices; and
  - hospitals and health care providers are subject to various legal claims by
    patients and others and are adversely affected by increasing costs of
    insurance.
  - many hospitals are aggressively buying physician practices and assuming risk
    contracts to gain market share. If revenues do not increase accordingly,
    this practice could reduce profits;
  - Medicare is changing its reimbursement system for nursing homes. Many
    nursing home providers are not sure how they will be treated. In many cases,
    the providers may receive lower reimbursements and these would have to cut
    expenses to maintain profitabilit; and
  - most retirement/nursing home providers rely on entrance fees for operating
    revenues. If people live longer than expected and turnover is lower than
    budgeted, operating revenues would be adversely affected by less than
    expected entrance fees.

Changes to the portfolio from bond redemptions, maturities and sales may affect
the Fund's concentration over time.

BOND QUALITY RISK

A reduction in a bond's rating may decrease its value and, indirectly, the value
of your investment in the Fund.

INSURANCE RELATED RISK

Some bonds may be backed by insurance companies (as shown under Portfolio).
Insurance policies generally make payments only according to a bond's original
payment schedule and do not make early payments when a bond defaults or becomes
taxable. Although the federal government does not regulate the insurance
business, various state laws and federal initiatives and tax law changes could
significantly affect the insurance business. The claims-paying ability of the
insurance companies is generally rated A or better by Standard & Poor's or
another nationally recognized rating organization. The insurance company ratings
are subject to change at any time at the discretion of the rating agencies.

LITIGATION AND LEGISLATION RISKS

We do not know of any pending litigation that might have a material adverse
effect upon the Fund.

Future tax legislation could affect the value of the portfolio by:
  - limiting real property taxes,
  - reducing tax rates,

                                       9
<PAGE>
  - imposing a flat or other form of tax, or
  - exempting investment income from tax.

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:
  - ADDING the value of the bonds, net accrued interest, cash and any other Fund
    assets;
  - 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
  - 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 28 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.

If the Fund does not have cash available to pay you for units you are selling,
the agent for the Sponsors will select bonds to be sold. Bonds will be selected
based on market and credit factors. These sales could be made at times when the
bonds 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.

If you acquire 25% or more of the outstanding units of the Fund and you sell
units with a value exceeding $250,000, the Trustee may choose to pay you "in
kind" by distributing bonds and cash with a total value equal to the price of
those units. The Trustee will try to distribute bonds in the portfolio pro rata,
but it reserves the right to distribute only one or a few bonds. The Trustee
will act as your agent in an in kind distribution and will either hold the bonds
for your account or sell them as you instruct. You must pay any transaction
costs

                                       10
<PAGE>
as well as transfer and ongoing custodial fees on sales of bonds distributed in
kind.

There could be a delay in paying you for your units:
  - if the New York Stock Exchange is closed (other than customary weekend and
    holiday closings);
  - 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
  - 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 1.50%. 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 bonds, 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:
  - cost of initial preparation of legal documents;
  - federal and state registration fees;
  - initial fees and expenses of the Trustee;
  - initial audit; and
  - legal expenses and other out-of-pocket expenses.

These costs are amortized over the first five years of the Fund.

EVALUATIONS

An independent Evaluator values the bonds 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).
Bond values are based on current bid or offer prices for the bonds or comparable
bonds. In the past, the difference between bid and offer prices of publicly
offered tax-exempt bonds has ranged from 0.5% of face amount on actively traded
issues to 3.5% on inactively traded issues; the difference has averaged between
1 and 2%.

INCOME

The Trustee credits interest to an Income Account and other receipts to a
Capital Account. The Trustee may establish a

                                       11
<PAGE>
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:
  - to reimburse the Trustee for the Fund's operating expenses;
  - for extraordinary services and costs of indemnifying the Trustee and the
    Sponsors;
  - costs of actions taken to protect the Fund and other legal fees and
    expenses;
  - expenses for keeping the Fund's registration statement current; and
  - Fund termination expenses and any governmental charges.

The Sponsors are currently reimbursed up to 55 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. Legal,
typesetting, electronic filing and regulatory filing fees and expenses
associated with updating the Portfolio's registration statement yearly are also
now chargeable to the Portfolio. 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 bond.

Unlike a mutual fund, the portfolio is designed to remain intact and we may keep
bonds in the portfolio even if their credit quality declines or other adverse
financial circumstances occur. However, we may sell a bond in certain cases if
we believe that certain adverse credit conditions exist or if a bond becomes
taxable.

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 may affect the
composition of the portfolio. Units offered in the secondary market may not
represent the same face amount of bonds that they did originally.

We decide whether or not to offer units for sale that we acquire in the
secondary market after reviewing:
  - diversity of the portfolio;
  - size of the Fund relative to its original size;
  - ratio of Fund expenses to income;
  - current and long-term returns;
  - degree to which units may be selling at a premium over par; and
  - cost of maintaining a current prospectus.

FUND TERMINATION

The Fund will terminate following the stated maturity or sale of the last bond
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

                                       12
<PAGE>
Fund have fallen below 40% of the face amount of bonds 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 bonds, and you will receive your final distribution. Any
bond 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 bonds. 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:
  - to cure ambiguities;
  - to correct or supplement any defective or inconsistent provision;
  - to make any amendment required by any governmental agency; or
  - 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:
  - it fails to perform its duties and the Sponsors determine that its
    replacement is in your best interest; or
  - 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 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:

                                       13
<PAGE>
  - remove it and appoint a replacement Sponsor;
  - liquidate the Fund; or
  - 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
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 Department, 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.

                                       14
<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 bonds. 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.

A Sponsor or Underwriter may realize profits or sustain losses on bonds in the
Fund which were acquired from underwriting syndicates of which it was a member.

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

The Fund and the Agent for the Sponsors have each adopted a code of ethics
requiring reporting of personal securities transactions by its employees with
access to information on Fund transactions. Subject to certain conditions, the
codes permit employees to invest in Fund securities for their own accounts. The
codes are designed to prevent fraud, deception and misconduct against the Fund
and to provide reasonable standards of conduct. These codes are on file with the
Commission and you may obtain a copy by contacting the Commission at the address
listed on the back cover of this prospectus.

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"). To date we are not aware of any major operational difficulties
resulting from the computer system changes necessary to prepare for the Year
2000. However, there can be no assurance that the Year 2000 Problem will not
adversely affect the issuers of the bonds contained in the Portfolio. We cannot
predict whether any impact will be material to the Fund as a whole.

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 or subject to
special rules. You should consult your own tax adviser about your particular
circumstances.

At the date of issue of each bond, counsel for the issuer delivered an opinion
to the effect that interest on the bond is exempt from regular federal income
tax. However, interest may be subject to state and local taxes and be taken into
account in determining your preference items for alternative minimum tax
purposes. Neither we nor our counsel have reviewed the issuance of the bonds,
related proceedings or the basis for the opinions of counsel for the issuers. We
cannot assure you that the issuer (or other users) have complied or will comply
with any requirements necessary for a bond to be tax-exempt. If any of the bonds
were determined not to be tax-

                                       15
<PAGE>
exempt, you could be required to pay income tax for current and prior years, and
if the Fund were to sell the bond, it might have to sell it at a substantial
discount.

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 bond in the Fund.

GAIN OR LOSS UPON DISPOSITION

When all or part of your share of a bond is disposed of (for example, when the
Fund sells, exchanges or redeems a bond 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 bond when you purchase a unit is less than its stated redemption price at
maturity (or, if it is an original issue discount bond, the issue price
increased by original issue discount that has accrued on the bond 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 bond for more than one year and short-term otherwise. If
you are an individual and sell your units after holding them for more than one
year, you may be entitled to a 20% maximum federal tax rate on any resulting
gains. Because the deductibility of capital losses is subject to limitations,
you may not be able to deduct all of your capital losses. Consult your tax
adviser in this regard.

YOUR BASIS IN THE BONDS

Your aggregate basis in the bonds 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 not a corporate investor, you will not be entitled to a deduction for
your share of fees and expenses of the Fund. Also, if you borrowed money in
order to purchase or carry your units, you will not be able to deduct the
interest on this borrowing for federal income tax purposes. The IRS may treat
your purchase of units as made with borrowed money even if the money is not
directly traceable to the purchase of units.

STATE AND LOCAL TAXES

Under the income tax laws of the State and City of New York, the Fund will not
be taxed as a corporation. If you are a New York taxpayer, your income from the
Fund will not be tax-exempt in New York except to the extent that the income is
earned on bonds that are tax-exempt for New York purposes. Depending on where
you live, your income from the Fund may be subject to state and local taxation.
You should consult your tax adviser in this regard.

                                       16
<PAGE>
SUPPLEMENTAL INFORMATION

You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information includes more detailed risk disclosure
about the types of bonds that may be in the Fund's portfolio, general risk
disclosure concerning any insurance securing certain bonds, and general
information about the structure and operation of the Fund. The supplemental
information is also available from the SEC.

                                       17
<PAGE>

          MUNICIPAL INVESTMENT TRUST FUND,
          INTERMEDIATE TERM SERIES - 312,
          DEFINED ASSET FUNDS

          REPORT OF INDEPENDENT ACCOUNTANTS

          The Sponsors, Trustee and Holders of Municipal Investment Trust Fund,
          Intermediate Term Series - 312, Defined Asset Funds:

          We have audited the accompanying statement of condition of Municipal
          Investment Trust Fund, Intermediate Term Series - 312, Defined Asset
          Funds, including the portfolio, as of January 31, 2000 and the related
          statements of operations and of changes in net assets for the year
          ended January 31, 2000 and the period February 7, 1998 to January 31,
          1999. 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 January 31, 2000, 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 Municipal
          Investment Trust Fund, Intermediate Term Series - 312, Defined Asset
          Funds at January 31, 2000 and the results of its operations and
          changes in its net assets for the above-stated periods in conformity
          with generally accepted accounting principles.

          DELOITTE & TOUCHE LLP

          New York, N.Y.
          April 5, 2000


                                     D - 1.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INTERMEDIATE TERM SERIES - 312,
     DEFINED ASSET FUNDS

     STATEMENT OF CONDITION
     As of January 31, 2000

<TABLE>
<S>                                                                                <C>             <C>
TRUST PROPERTY:
  Investment in marketable securities -
     at value (cost $ 11,574,024 )(Note 1)........                                                 $11,096,747
  Proceeds receivable from sale of securities ....                                                     132,020
  Accrued interest ...............................                                                     119,715
  Accrued interest on Segregated Bonds (Note 5) ..                                                       2,607
  Cash - income ..................................                                                       2,805
  Cash - income on Segregated Bonds ..............                                                      17,858
  Cash - principal ...............................                                                      88,933
  Deferred organization costs (Note 6) ...........                                                       7,600
                                                                                                   -----------
    Total trust property .........................                                                  11,468,285

LESS LIABILITIES:
  Income advance from Trustee.....................                                 $    91,295
  Deferred sales charge (Note 5) .................                                     130,432
  Principal payments payable (Segregated Bonds) ..                                       3,398
  Redemption payable .............................                                     133,268
  Accrued Sponsors' fees .........................                                         533
  Other liabilities (Note 6) .....................                                       7,600         366,526
                                                                                   -----------     -----------

NET ASSETS, REPRESENTED BY:
  11,458 units of fractional undivided
     interest outstanding (Note 3)................                                  11,071,458

  Undistributed net investment income ............                                      30,301     $11,101,759
                                                                                   -----------     ===========

UNIT VALUE ($ 11,101,759 / 11,458 units ).........                                                 $    968.91
                                                                                                   ===========

</TABLE>

                       See Notes to Financial Statements.


                                     D - 2.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INTERMEDIATE TERM SERIES - 312,
     DEFINED ASSET FUNDS

     STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                                                                 February 7, 1998
                                                                                  Year Ended            to
                                                                                  January 31,       January 31,
                                                                                     2000              1999
                                                                                     ----              ----

<S>                                                                              <C>               <C>
INVESTMENT INCOME:
  Interest income ........................                                       $   546,572       $   560,235
  Interest income on Segregated
    Bonds (Note 5) .......................                                             8,295            12,170
  Trustee's fees and expenses ............                                           (14,355)           (9,593)
  Sponsors' fees .........................                                            (5,517)           (5,665)
                                                                                 ------------------------------
  Net investment income ..................                                           534,995           557,147
                                                                                 ------------------------------

REALIZED AND UNREALIZED LOSS
  ON INVESTMENTS:
  Realized gain (loss) on
    securities sold or redeemed ..........                                           (19,162)            2,082
  Unrealized appreciation (depreciation)
    of investments .......................                                          (571,828)           94,551
                                                                                 ------------------------------
  Net realized and unrealized
     gain (loss) on investments ..........                                          (590,990)           96,633
                                                                                 ------------------------------

NET INCREASE (DECREASE) IN NET ASSETS
  RESULTING FROM OPERATIONS ..............                                       $   (55,995)      $   653,780
                                                                                 ==============================

</TABLE>

                       See Notes to Financial Statements.


                                     D - 3.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INTERMEDIATE TERM SERIES - 312,
     DEFINED ASSET FUNDS

     STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                                                                 February 7, 1998
                                                                                  Year Ended            to
                                                                                  January 31,       January 31,
                                                                                     2000              1999
                                                                                     ----              ----
<S>                                                                              <C>               <C>
OPERATIONS:
  Net investment income ..................                                       $   534,995       $   557,147
  Realized gain (loss) on
    securities sold or redeemed ..........                                           (19,162)            2,082
  Unrealized appreciation (depreciation)
    of investments .......................                                          (571,828)           94,551
                                                                                 ------------------------------
  Net increase (decrease) in net assets
    resulting from operations ............                                           (55,995)          653,780
                                                                                 ------------------------------

INCOME DISTRIBUTIONS TO
  HOLDERS (Note 2)........................                                          (526,409)         (512,281)
                                                                                 ------------------------------
SHARE TRANSACTIONS:
  Deferred sales charge (Note 5):
    Principal ............................                                          (171,612)         (141,309)

  Redemption amounts:
    Income ...............................                                            (1,353)           (1,333)
    Principal ............................                                          (630,246)         (515,609)
                                                                                 ------------------------------
  Net share transactions .................                                          (803,211)         (658,251)
                                                                                 ------------------------------

NET DECREASE IN NET ASSETS ...............                                        (1,385,615)         (516,752)

NET ASSETS AT BEGINNING OF PERIOD ........                                        12,487,374        13,004,126
                                                                                 ------------------------------
NET ASSETS AT END OF PERIOD ..............                                       $11,101,759       $12,487,374
                                                                                 ==============================
PER UNIT:
  Income distributions during
    period ...............................                                       $     44.44       $     41.08
                                                                                 ==============================
  Net asset value at end of
    period ...............................                                       $    968.91       $  1,032.18
                                                                                 ==============================
TRUST UNITS:
  Redeemed during period .................                                               640               510
  Outstanding at end of period ...........                                            11,458            12,098
                                                                                 ==============================
</TABLE>

                       See Notes to Financial Statements.


                                     D - 4.
<PAGE>

          MUNICIPAL INVESTMENT TRUST FUND,
          INTERMEDIATE TERM SERIES - 312,
          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
                    except that value on February 7, 1998 was based upon
                    offering side evaluations at February 5, 1998, the day prior
                    to the Date of Deposit. Cost of securities at February 7,
                    1998 was also based on such offering side evaluations.

           (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

          A distribution of net investment income is made to Holders each month.
          Receipts other than interest, after deductions for redemptions and
          applicable expenses, are also distributed periodically.

     3.   NET CAPITAL

<TABLE>
<S>                                                                                                <C>
     Cost of 11,458 units at Date of Deposit ....................                                  $11,817,995
     Transfer to capital of interest on Segregated Bonds (Note 5)                                       20,465
     Redemptions of units - net cost of 1,150 units redeemed
       less redemption amounts (principal).......................                                       40,276
     Deferred sales charge (Note 5) .............................                                     (312,921)
     Realized loss on securities sold or redeemed ...............                                      (17,080)
     Net unrealized depreciation of investments..................                                     (477,277)
                                                                                                   -----------

     Net capital applicable to Holders ..........................                                  $11,071,458
                                                                                                   ===========
</TABLE>

     4.   INCOME TAXES

          As of January 31, 2000, net unrealized appreciation of investments,
          based on cost for Federal income tax purposes, aggregated $477,277, of
          which $477,313 related to depreciated securities and $36 related to
          appreciated securities. The cost of investment securities for Federal
          income tax purposes was $11,574,024 at January 31, 2000.


                                     D - 5.
<PAGE>

          MUNICIPAL INVESTMENT TRUST FUND,
          INTERMEDIATE TERM SERIES - 312,
          DEFINED ASSET FUNDS

          NOTES TO FINANCIAL STATEMENTS

     5.   DEFERRED SALES CHARGE

          $105,000 face amount of the Town of Silverthorne, Summit Cnty., CO,
          Excise Tax Rev. Bonds, Ser. 1998 and $100,000 face amount of New York
          State Urban Dev. Corp., Youth Fac. Svc. Contract Rev. Bonds, Ser. A,
          have been segregated to fund the deferred sales charges. The sales
          charges are being paid for with the interest received and by periodic
          sales or maturity of these bonds, as well as with principal proceeds
          received in conjunction with the dispositon on the unsegregated bonds
          in the portfolio. A deferred sales charge of $3.50 per Unit is charged
          on a quarterly basis, and paid to the Sponsors periodically by the
          Trustee on behalf of the Holders, up to an aggregate of $28.00 per
          Unit over the first two years of the life of the Fund. Should a Holder
          redeem Units prior to the second anniversary of the Fund, the
          remaining balance of the deferred sales charge will be charged.

     6.   DEFERRED ORGANIZATION COSTS

          Deferred organization costs are being amortized over five years.
          Included in "Other liabilities" on the Statement of Condition is
          $7,600 payable to the Trustee for reimbursement of costs related to
          the organization of the Trust.


                                     D - 6.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INTERMEDIATE TERM SERIES - 312,
     DEFINED ASSET FUNDS

     PORTFOLIO
     As of January 31, 2000

<TABLE>
<CAPTION>

                                               Rating                                           Optional
     Portfolio No. and Title of                  of         Face                               Redemption
            Securities                       Issues(1)     Amount     Coupon    Maturities(3) Provisions(3)   Cost(2)    Value(2)
            ----------                       ---------  ----------- ----------- ------------  ------------  ----------- -----------

<S>                                          <C>        <C>         <C>           <C>          <C>          <C>         <C>
   1 The Health Care Auth. of Athens and        AA      $ 1,000,000     4.300 %      2004      None         $   997,230 $   945,610
     Limestone Cnty., AL, Hosp. Tax
     Anticipation and Rev. Bonds, Ser. 1998
     (Asset Guaranty Ins.) (4)

   2 Arkansas Dev. Fin. Auth., Econ. Dev.       AAA         120,000     4.550        2002      None             121,266     117,548
     Rev. Bonds (ADFA Guaranty Prog.), Ser.
     1998 (AMBAC Ins.) (AMT) (4)(5)                         175,000     4.750        2004      None             177,506     168,432

   3 Town of Silverthorne, Summit Cnty., CO,    AAA         105,000(6)  3.850        2000      None             104,886     104,922
     Excise Tax Rev. Bonds, Ser. 1998 (FSA
     Ins.) (4)

   4 Illinois Hlth. Fac. Auth., Rev. Rfdg.      A-          400,000     4.500        2003      None             400,000     381,008
     Bonds (Covenant Retirement Cmnty.,
     Inc.), Ser. 1998                                       170,000     4.600        2004      None             170,000     159,654


   5 The Vil. of McCook, IL, Rev. Bonds (The    AA-       1,335,000     5.100        2004(7)   12/01/04       1,358,429   1,278,009
     British Home for Retired Men and Women                                                    @  100.000
     Proj.), Ser. 1989 (LaSalle National
     Bank, Chicago, IL - Letter of Credit) (8)

   6 Indiana Hlth. Fac. Fin. Auth., Hosp.       A-(f)       550,000     4.500        2004      None             550,000     520,273
     Rev. Rfdg. Bonds (Jackson Cnty. Schneck
     Mem. Hosp. Proj.), Ser. 1998                           650,000     4.600        2005      None             650,000     607,081

   7 East-Union Cmnty. Sch. Bldg. Corp.         A+           10,000     4.200        2001      None              10,014       9,949
     (Boone Cnty., IN), First Mtge. Bonds,
     Ser. 1998                                               40,000     4.200        2001      None              40,062      39,558

                                                             40,000     4.300        2002      None              40,071      39,406

                                                             40,000     4.300        2002      None              40,079      39,231


</TABLE>


                                     D - 7.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INTERMEDIATE TERM SERIES - 312,
     DEFINED ASSET FUNDS

     PORTFOLIO
     As of January 31, 2000

<TABLE>
<CAPTION>

                                               Rating                                           Optional
     Portfolio No. and Title of                  of         Face                               Redemption
            Securities                       Issues(1)     Amount     Coupon    Maturities(3) Provisions(3)   Cost(2)     Value(2)
            ----------                       ---------  ----------- ----------- ------------  ------------  ----------- -----------

<S>                                          <C>        <C>         <C>           <C>          <C>          <C>         <C>
   8 Porter Cnty., IN, Hosp. Association,      (b)      $   100,000     4.900 %      2003      None         $   101,255 $    96,228
     Hosp. Rev. Rfdg. Bonds, Ser. 1997
                                                            120,000     4.950        2004      None             121,376     113,802

   9 School City of Mishawaka Multi-School      A           330,000     4.200        2001      None             330,446     328,241
     Bldg. Corp. (St. Joseph Cnty., IN),
     First Mtge. Bonds, Ser. 1998                           130,000     4.200        2001      None             130,203     128,236

  10 City of Grosse Pointe Park, Cnty. of      (b)          150,000     4.700        2005(7)   09/01/05         150,468     145,130
     Wayne, MI, Ltd. Tax Gen. Oblig. Bonds,                                                    @  100.000
     Ser. 1998 A
                                                            160,000     4.700        2005(7)   09/01/05         160,499     154,805
                                                                                               @  100.000

                                                            170,000     4.700        2005(7)   09/01/05         170,530     164,480
                                                                                               @  100.000

  11 New Hampshire Hsg. Fin. Auth., Single      Aa3(m)      420,000     4.550        2003      None             420,000     409,618
     Family Mtge. Acquisition Rev. Bonds,
     Ser. 1998 A (AMT)(5)
                                                            440,000     4.650        2004      None             440,000     428,679

  12 New York State Urban Dev. Corp.            A(f)        100,000(6)  4.250        2000      None             100,404      99,982
     Correctional Facs. Svc. Contract, Rev.
     Bonds Ser. A                                           340,000     4.250        2002      None             340,000     334,533

                                                            185,000     4.500        2004      None             185,483     179,385

  13 Ohio Hsg. Fin. Agy., Residential Mtge.     AAA         995,000     4.650        2005      None             996,532     962,981
     Rev. Bonds, Ser 1998 A-1 (AMT) (5)

  14 Oklahoma Hsg. Fin. Dev. Aith., Sub.        A         1,000,000     4.800        2002      None           1,006,350     982,050
     Rev. Oblig. (Lease Purchase Prog.),
     Ser. 1997 B
</TABLE>


                                     D - 8.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INTERMEDIATE TERM SERIES - 312,
     DEFINED ASSET FUNDS

     PORTFOLIO
     As of January 31, 2000

<TABLE>
<CAPTION>

                                               Rating                                             Optional
     Portfolio No. and Title of                  of        Face                                 Redemption
            Securities                       Issues(1)    Amount       Coupon    Maturities(3) Provisions(3)   Cost(2)    Value(2)
            ----------                       ---------  -----------  ----------- ------------  ------------ ----------- -----------

<S>                                          <C>        <C>         <C>           <C>          <C>          <C>         <C>
  15 Harrision Cnty., TX, Hlth. Fac. Dev.       A       $   250,000     4.650 %      2004      None         $   250,628 $   238,613
     Corp., Hosp. Rev. Bonds (Marshall Regl.
     Med. Ctr. Proj.), Ser. 1998 (ACA Ins.)
     (4)                                                    965,000     4.700        2005      None             967,779     907,679

  16 Ind. Dev. Auth. of Halifax, VA, Exempt    (c)        1,025,000     4.900        2002      None           1,042,528   1,011,624
     Fac. Rfdg. Rev. Bonds (Old Dominion
     Elec. Coop. Proj.) Ser. 1997 (AMT) (5)

                                                         ----------                                          ----------  ----------
     TOTAL                                              $11,515,000                                         $11,574,024 $11,096,747
                                                         ==========                                          ==========  ==========

</TABLE>

                             See Notes to Portfolio.


                                     D - 9.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INTERMEDIATE TERM SERIES - 312,
     DEFINED ASSET FUNDS

     NOTES TO PORTFOLIO
     As of January 31, 2000

    (1)   The ratings are of the bonds themselves by Standard & Poor's Ratings
          Group, or by Moody's Investors Service, Inc if followed by "(m)", or
          by Fitch Investors Service, Inc if followed by "(f)"; "(a)" indicates
          that it is a rating of the outstanding debt obligations of the
          institution providing the letter of credit or guarantee; "(b)"
          indicates that while there is no such available rating, in the opinion
          of Defined Asset Funds research analysts, the bond has credit
          characteristics comparable to bonds rated "A" or better; "(c)"
          indicates that while there is no such available rating, in the opinion
          of Defined Asset Funds research analysts, the bond does not have
          credit characteristics comparable to bonds rated "A" or better. Bond
          ratings have been furnished by the Evaluator but not confirmed with
          the rating agencies.

    (2)   See Notes to Financial Statements.

    (3)   Optional redemption provisions, which may be exercised in whole or in
          part, are initially at prices of par plus a premium, then subsequently
          at prices declining to par. Certain securities may provide for
          redemption at par prior or in addition to any optional or mandatory
          redemption dates or maturity, for example, through the operation of a
          maintenance and replacement fund, if proceeds are not able to be used
          as contemplated, the project is condemned or sold or the project is
          destroyed and insurance proceeds are used to redeem the securities.
          Many of the securities are also subject to mandatory sinking fund
          redemption commencing on dates which may be prior to the date on which
          securities may be optionally redeemed. Sinking fund redemptions are at
          par and redeem only part of the issue. Some of the securities have
          mandatory sinking funds which contain optional provisions permitting
          the issuer to increase the principal amount of securities called on a
          mandatory redemption date. The sinking fund redemptions with optional
          provisions may, and optional refunding redemptions generally will,
          occur at times when the redeemed securities have an offering side
          evaluation which represents a premium over par. To the extent that the
          securities were acquired at a price higher than the redemption price,
          this will represent a loss of capital when compared with the Public
          Offering Price of the Units when acquired. Distributions will
          generally be reduced by the amount of the income which would otherwise
          have been paid with respect to redeemed securities and there will be
          distributed to Holders any principal amount and premium received on
          such redemption after satisfying any redemption requests for Units
          received by the Fund. The estimated current return may be affected by
          redemptions.

    (4)   Insured by the indicated municipal bond insurance company.

    (5)   Securities that are tax preference items for purposes of the
          Alternative Minimum Tax are indicated by "(AMT)".

    (6) These bonds have been segregated to fund the deferred sales charges.


                                    D - 10.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INTERMEDIATE TERM SERIES - 312,
     DEFINED ASSET FUNDS

     NOTES TO PORTFOLIO
     As of January 31, 2000

    (7)   The debt obligation in Portfolio Number 5 has a stated maturity date
          of 2014 and the debt obligations in Portfolio Number 10 have stated
          maturity dates of 2009, 2011 and 2012. However, the Trustee, as the
          holder of these debt obligations, has the right to cause such debt
          obligation to be repurchased or redeemed at par on the specific date
          indicated. In certain instances, the corporate obligor of such debt
          obligation has the right to cause a third party to purchase the debt
          obligation in lieu of redemptions. The Sponsors have given irrevocable
          instructions to the Trustee to exercise its right to cause such debt
          obligations to be so redeemed, repurchased or purchased, unless it can
          be sold, in the opinion of the Trustee, for a net amount in excess of
          par before such time as the Trustee is required to exercise such
          rights.

    (8)   Certain bonds are covered by letters of credit which may expire prior
          to the maturity of the bonds. Upon expiration of a letter of credit,
          the issuer of the bond is obligated to obtain a replacement letter of
          credit or call the bond.


                                    D - 11.
<PAGE>
DEFINED ASSET FUNDS--REGISTERED TRADEMARK--

<TABLE>
<S>                                      <C>
HAVE QUESTIONS ?                         MUNICIPAL INVESTMENT TRUST FUND
Request the most recent free             INTERMEDIATE TERM SERIES--312
Information Supplement                   (A Unit Investment Trust)
that gives more details about            ---------------------------------------
the Fund, by calling:                    This Prospectus does not contain
The Chase Manhattan Bank                 complete information about the
1-800-323-1508                           investment company filed with the
                                         Securities and Exchange Commission in
                                         Washington, D.C. under the:
                                         - Securities Act of 1933 (file no.
                                         333-40345) and
                                         - Investment Company Act of 1940 (file
                                         no. 811-1777).
                                         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.
                                                                     11369--5/00
</TABLE>



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