MUNICIPAL INVT TR FD INTERM TERM SER 226 DEFINED ASSET FDS, 485BPOS, 2000-05-17

MUNICIPAL INVT TR FD INTERM TERM SER 226 DEFINED ASSET FDS
485BPOS, 2000-05-17

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AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 17, 2000

REGISTRATION NO. 33-52017
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- --------------------------------------------------------------------------------

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549
-------------------------------------

POST-EFFECTIVE AMENDMENT NO. 6
TO
FORM S-6
-------------------------------------

FOR REGISTRATION UNDER THE SECURITIES ACT
OF 1933 OF SECURITIES OF UNIT INVESTMENT
TRUSTS REGISTERED ON FORM N-8B-2

-------------------------------------

A. EXACT NAME OF TRUST:
MUNICIPAL INVESTMENT TRUST FUND
INTERMEDIATE TERM SERIES--226
DEFINED ASSET FUNDS

B. NAME OF DEPOSITOR:

MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
SALOMON SMITH BARNEY INC.
PRUDENTIAL SECURITIES INCORPORATED
PAINEWEBBER INCORPORATED
DEAN WITTER REYNOLDS INC.

C. COMPLETE ADDRESSES OF DEPOSITORS' PRINCIPAL EXECUTIVE OFFICES:

<TABLE>
<S> <C> <C>
MERRILL LYNCH, PIERCE,
FENNER & SMITH
INCORPORATED
DEFINED ASSET FUNDS
POST OFFICE BOX 9051
PRINCETON, NJ 08543-9051 SALOMON SMITH BARNEY INC.
388 GREENWICH
STREET--23RD FLOOR
NEW YORK, NY 10013
</TABLE>

<TABLE>
<S> <C> <C>
PRUDENTIAL SECURITIES PAINEWEBBER INCORPORATED DEAN WITTER REYNOLDS INC.
INCORPORATED 1285 AVENUE OF THE TWO WORLD TRADE
ONE NEW YORK PLAZA AMERICAS CENTER--59TH FLOOR
NEW YORK, NY 10292 NEW YORK, NY 10019 NEW YORK, NY 10048
</TABLE>

D. NAMES AND COMPLETE ADDRESSES OF AGENTS FOR SERVICE:

<S> <C> <C>
TERESA KONCICK, ESQ. ROBERT E. HOLLEY MICHAEL KOCHMANN
P.O. BOX 9051 1200 HARBOR BLVD. 388 GREENWICH STREET
PRINCETON, NJ 08543-9051 WEEHAWKEN, NJ 07087 NEW YORK, NY 10013

COPIES TO: DOUGLAS LOWE, ESQ.
PIERRE DE SAINT PHALLE, DEAN WITTER REYNOLDS INC.
LEE B. SPENCER, JR. ESQ. TWO WORLD TRADE
ONE NEW YORK PLAZA 450 LEXINGTON AVENUE CENTER--59TH FLOOR
NEW YORK, NY 10292 NEW YORK, NY 10017 NEW YORK, NY 10048
</TABLE>

The issuer has registered an indefinite number of Units under the Securities Act
of 1933 pursuant to Rule 24f-2 and filed the Rule 24f-2 Notice for the most
recent fiscal year on March 13, 2000.

Check box if it is proposed that this filing will become effective on May 26,
2000 pursuant to paragraph (b) of Rule 485. /X/

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<PAGE>
DEFINED ASSET FUNDS--REGISTERED TRADEMARK--
----------------------------------------------------

MUNICIPAL INVESTMENT TRUST FUND
INTERMEDIATE TERM SERIES--226
(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
INCORPORATED -----------------------------------------------------
SALOMON SMITH BARNEY INC. The Securities and Exchange Commission has not
PRUDENTIAL SECURITIES approved or disapproved these Securities or passed
INCORPORATED upon the adequacy of this prospectus. Any
PAINEWEBBER INCORPORATED representation to the contrary is a criminal offense.
DEAN WITTER REYNOLDS INC. Prospectus dated May 26, 2000.

<PAGE>
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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,
FEBRUARY 29, 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.................. 8
Insurance Related Risk............. 8
Litigation and Legislation Risks... 9
Selling or Exchanging Units.......... 9
Sponsors' Secondary Market......... 9
Selling Units to the Trustee....... 9
Exchange Option.................... 10
How The Fund Works................... 10
Pricing............................ 10
Evaluations........................ 10
Income............................. 10
Expenses........................... 10
Portfolio Changes.................. 11
Fund Termination................... 11
Certificates....................... 12
Trust Indenture.................... 12
Legal Opinion...................... 13
Auditors........................... 13
Sponsors........................... 13
Trustee............................ 13
Underwriters' and Sponsors'
Profits.......................... 13
Public Distribution................ 13
Code of Ethics..................... 14
Year 2000 Issues................... 14
Taxes................................ 14
Supplemental Information............. 15
Financial Statements................. D-1
</TABLE>

2
<PAGE>
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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 13
short-intermediate term tax-exempt
municipal bonds with a current aggregate
face amount of $6,405,000.
- 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
(March 4, 1994), 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. % of
the bonds are currently callable.
- 24% of the bonds are insured by
insurance companies.

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

<TABLE>
- Financial Institutions 13%
<C> <S>
- General Obligation 11%
- Hospitals/Health Care 3%
- Housing 23%
- Industrial Development Revenue 7%
- Refunded Bonds 23%
- State/Local Government Supported 20%
</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.
- 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 $ 4.11
Annual Income per unit $49.38
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>
$0.68
Trustee's Fee
$0.47
Portfolio Supervision,
Bookkeeping and
Administrative Fees
(including updating
expenses)
<CAPTION>
ESTIMATED ANNUAL FUND OPERATING EXPENSES
AMOUNT
PER UNIT
--------
<C> <S> <C>
$0.41
Evaluator's Fee
$0.40
Other Operating Expenses
-----
$1.96
TOTAL
</TABLE>

<TABLE>
<C> <S>
The Sponsors historically paid 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 INTERMEDIATE
SERIES, WHICH HAD THE SAME INVESTMENT
OBJECTIVES, STRATEGIES AND TYPES OF
BONDS AS THIS FUND. These prior
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>

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<TABLE>
High 6.27% 5.24% 5.85% 6.49% 6.16% 6.36%
<S> <C> <C> <C> <C> <C> <C>
Average -0.24 4.50 5.60 1.66 5.31 6.11
Low -5.87 2.96 5.37 -3.23 3.63 5.87
</TABLE>

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<TABLE>
<S> <C> <C> <C> <C> <C> <C>
Average
Sales fee 1.94% 4.02% 4.99%
</TABLE>

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NOTE: ALL RETURNS REPRESENT CHANGES IN UNIT PRICE WITH DISTRIBUTIONS REINVESTED
INTO THE MUNICIPAL FUND INVESTMENT ACCUMULATION PROGRAM.

<TABLE>
<C> <S>
8. IS THE FUND MANAGED?

Unlike a mutual fund, the Fund is not 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.

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 $996.40
(as of February 29, 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 % 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>
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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. However, this fund is not concentrated in any particular type of
bond.

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

8
<PAGE>
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,
- 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

9
<PAGE>
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:
- 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.

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 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;

10
<PAGE>
- 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 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

11
<PAGE>
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:
- 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.

12
<PAGE>
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 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.

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.

13
<PAGE>
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 may 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-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

14
<PAGE>
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 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.

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.

15
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226,
DEFINED ASSET FUNDS

REPORT OF INDEPENDENT ACCOUNTANTS

The Sponsors, Trustee and Holders
of Municipal Investment Trust Fund,
Intermediate Term Series - 226, Defined Asset Funds:

We have audited the accompanying statement of condition of Municipal
Investment Trust Fund, Intermediate Term Series - 226, Defined Asset
Funds, including the portfolio, as of February 29, 2000 and the
related statements of operations and of changes in net assets for the
years ended February 29, 2000 and February 28, 1999 and 1998. 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 auditing standards
generally accepted in the United States of America. 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 February 29, 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 - 226, Defined Asset
Funds at February 29, 2000 and the results of its operations and
changes in its net assets for the above-stated years in accordance
with accounting principles generally accepted in the Unites States of
America.

DELOITTE & TOUCHE LLP

New York, N.Y.
May 10, 2000

D - 1.
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226, DEFINED ASSET FUNDS

STATEMENT OF CONDITION
As of February 29, 2000

<TABLE>
<S> <C> <C>
TRUST PROPERTY:
Investment in marketable securities
at value (cost $ 6,341,001)(Note 1) ......... $ 6,449,483
Accrued interest................................ 123,855
Income payments receivable...................... 34
Cash - principal ............................... 660
-------------
Total trust property ......................... 6,574,032

LESS LIABILITIES:
Income advance from Trustee..................... $ 48,004
Accrued Sponsors' fees ......................... 526 48,530
------------- -------------

NET ASSETS, REPRESENTED BY:
6,606 units of fractional undivided
interest outstanding (Note 3) ............... 6,450,143

Undistributed net investment income ............ 75,359 $ 6,525,502
------------- =============

UNIT VALUE ($ 6,525,502 / 6,606 units)............ $ 987.81
=============
</TABLE>

See Notes to Financial Statements.

D - 2.
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226, DEFINED ASSET FUNDS

STATEMENTS OF OPERATIONS

Year Ended
February 29, Years Ended February 28,
2000 1999 1998
---- ---- ----

INVESTMENT INCOME:

Interest income ........................ $ 363,419 $ 419,653 $ 492,407
Trustee's fees and expenses ............ (10,127) (10,725) (12,279)
Sponsors' fees ......................... (3,224) (3,135) (3,504)
----------------------------------------------
Net investment income .................. 350,068 405,793 476,624
----------------------------------------------

REALIZED AND UNREALIZED GAIN (LOSS)
ON INVESTMENTS:
Realized gain on
securities sold or redeemed .......... 26,980 82,539 45,406
Unrealized appreciation (depreciation)
of investments ....................... (348,279) 8,293 232,417
----------------------------------------------
Net realized and unrealized
gain (loss) on investments ........... (321,299) 90,832 277,823
----------------------------------------------

NET INCREASE IN NET ASSETS
RESULTING FROM OPERATIONS .............. $ 28,769 $ 496,625 $ 754,447
==============================================
</TABLE>

See Notes to Financial Statements.

D - 3.
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226, DEFINED ASSET FUNDS

STATEMENTS OF CHANGES IN NET ASSETS

Year Ended
February 29, Years Ended February 28,
2000 1999 1998
---- ---- ----

<S> <C> <C> <C>
OPERATIONS:
Net investment income .................. $ 350,068 $ 405,793 $ 476,624
Realized gain on
securities sold or redeemed .......... 26,980 82,539 45,406
Unrealized appreciation (depreciation)
of investments ....................... (348,279) 8,293 232,417
----------------------------------------------
Net increase in net assets
resulting from operations ............ 28,769 496,625 754,447
----------------------------------------------
DISTRIBUTIONS TO HOLDERS (Note 2):
Income ................................ (350,574) (407,820) (478,123)
Principal .............................. (18,136) (28,663) (25,086)
----------------------------------------------
Total distributions .................... (368,710) (436,483) (503,209)
----------------------------------------------
SHARE TRANSACTIONS:
Redemption amounts - income ............ (10,240) (14,201) (14,578)
Redemption amounts - principal ......... (940,031) (1,435,521) (1,371,836)
----------------------------------------------
Total share transactions ............... (950,271) (1,449,722) (1,386,414)
----------------------------------------------

NET DECREASE IN NET ASSETS ............... (1,290,212) (1,389,580) (1,135,176)

NET ASSETS AT BEGINNING OF YEAR .......... 7,815,714 9,205,294 10,340,470
----------------------------------------------
NET ASSETS AT END OF YEAR ................ $ 6,525,502 $ 7,815,714 $ 9,205,294
==============================================
PER UNIT:
Income distributions during
year ................................. $ 49.34 $ 49.50 $ 49.83
==============================================
Principal distributions during
year ................................. $ 2.70 $ 3.65 $ 2.73
==============================================
Net asset value at end of
year ................................. $ 987.81 $ 1,035.19 $ 1,027.61
==============================================
TRUST UNITS:
Redeemed during year ................... 944 1,408 1,379
Outstanding at end of year ............. 6,606 7,550 8,958
==============================================
</TABLE>

See Notes to Financial Statements.

D - 4.
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226, 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 accounting principles generally accepted in the United
States of America.

(A) Securities are stated at value as determined by the Evaluator
based on bid side evaluations for the securities.

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

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 6,606 units at Date of Deposit ..................... $ 6,823,866
Less sales charge .......................................... 272,947
-----------
Net amount applicable to Holders ........................... 6,550,919
Redemptions of units - net cost of 5,394 units redeemed
less redemption amounts (principal)....................... (19,965)
Realized gain on securities sold or redeemed ............... 94,720
Principal distributions .................................... (284,013)
Net unrealized appreciation of investments.................. 108,482
-----------

Net capital applicable to Holders .......................... $ 6,450,143
===========
</TABLE>

4. INCOME TAXES

As of February 29, 2000, net unrealized appreciation of investments,
based on cost for Federal income tax purposes, aggregated $108,482, of
which $2,969 related to depreciated securities and $111,451 related to
appreciated securities. The cost of investment securities for Federal
income tax purposes was $6,341,001 at February 29, 2000.

D - 5.
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226, DEFINED ASSET FUNDS

PORTFOLIO
As of February 29, 2000

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

<S> <C> <C> <C> <C> <C> <C> <C>
1 Bessemer, AL, Industrial Development Aa3(m)(a) $ 100,000 5.375 % 2003 03/31/00 $ 99,123 $ 99,118
Board, Industrial Development Revenue @ 102.000
Bonds (Royal Switchgear Manufacturing
Co. Proj.) (AmSouth Bank, N.A., Birmingham,
AL, Letter of Credit) (AMT) (5) (7)
100,000 5.500 2004 03/31/00 99,241 98,904
@ 102.000

2 California Statewide Comm. Dev. Auth., AA- 190,000 5.000 2002 None 187,538 190,790
Cert. of Part., Keiro
Nursing Home

320,000 5.100 2003 None 315,466 322,122

375,000 5.400 2006 03/01/04 368,509 379,789
@ 102.000

170,000 5.300 2005 03/01/04 167,221 171,858
@ 102.000

225,000 5.200 2004 None 221,558 227,052

</TABLE>

D - 6.
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226, DEFINED ASSET FUNDS

PORTFOLIO
As of February 29, 2000

<S> <C> <C> <C> <C> <C> <C> <C>
3 County of Westchester, NY, Ind. Dev. AA- $ 75,000 5.250 % 2004 08/01/01 $ 74,699 $ 74,763
Agy., Arpt. Fac. Rev. Bonds @ 100.000
(Westchester Arpt. Association, L.P
Proj.), 1994 Ser. A (Canadian
Imperial Bank of Commerce- New York
Letter of Credit) (AMT) (5) (7)

4 IPS School Building Corp. AAA 160,000 5.500 2006(6) 07/15/04 160,000 165,987
(Indianapolis, IN), First Morte. @ 102.000
Bonds, Ser. 1994

5 Illinois Dev. Fin. Auth. Section 8, A 210,000 5.400 2002 None 210,000 210,023
Elderly Housing Rev. Rfdg. Bonds,
Ser. 1994 A (Galesburg Towers Proj.)
220,000 5.500 2003 03/01/02 220,000 220,180
@ 103.000

245,000 5.700 2005 03/01/02 245,000 244,157
@ 103.000

250,000 5.800 2006 03/01/02 250,000 248,575
@ 103.000

230,000 5.600 2004 03/01/02 230,000 229,657
@ 103.000

</TABLE>

D - 7.
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226, DEFINED ASSET FUNDS

PORTFOLIO
As of February 29, 2000

<S> <C> <C> <C> <C> <C> <C> <C>
6 Illinois Health Facility Authority AAA $ 555,000 5.400 % 2005(6) 03/01/04 $ 555,000 $ 572,360
Revenue Bonds, Ser. 1994 (Southern IL @ 102.000
Hospital Services) (MBIA Ins.) (4)
370,000 5.500 2006(6) 03/01/04 370,000 382,846
@ 102.000

235,000 5.100 2002 None 235,000 236,600

7 Kentucky Higher Educ. Student Loan Aaa(m) 855,000 5.100 2003 None 839,490 856,377
Corp., Ins. Student Loan Rev. Bonds,
Ser. 1993 B (AMT) (5)

8 City of Ketchikan, AK, G.O. Port Bonds, AAA 170,000 4.850 2003 None 165,498 168,849
Ser. 1994 (AMBAC Ins.) (AMT) (4) (5)

180,000 4.950 2004 05/15/04 174,890 178,497
@ 101.000

9 Michigan State Hosp. Fin. Auth., Hosp. A 130,000 4.750 2002 None 127,084 128,777
Rev. Bonds, Holland Comm. Hosp.,
Ser. 1993
55,000 4.850 2003 None 53,647 54,199

10 New York City, NY, G.O. Bonds, 1993 A(f) 365,000 5.750 2003 None 366,292 373,610
Ser. D

</TABLE>

D - 8.
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226, DEFINED ASSET FUNDS

PORTFOLIO
As of February 29, 2000

<S> <C> <C> <C> <C> <C> <C> <C>
11 Pittsburgh, PA, Urban Development A $ 80,000 4.800 % 2003 None 77,460 $ 79,044
Authority, Home Improvement Loan Bonds, $
1994 Ser. A (AMT) (5)
100,000 4.800 2004 02/01/04 96,421 98,325
@ 102.000

135,000 4.900 2005 02/01/04 129,854 132,390
@ 102.000

12 The Ind. Dev. Board of the City of Aa3(m)(a) 90,000 5.250 2002 03/31/00 89,135 89,357
Bessemer, AL, Ind. Dev. Rev. Bonds @ 102.000
(Royal Switchgear Manufacturing Co.
Proj.) (AmSouth Bank, N.A.- Birmingham,
AL, Letter of Credit) (AMT) (5) (7)

13 Urban Dev. Auth., of Pittsburgh, PA, A 10,000 4.700 2002 None 9,695 9,915
Home Imp. Loan Bonds, 1994 Ser. A
(AMT) (5)

14 Virginia Educ. Loan Auth., Student Aaa(m) 130,000 5.150 2004 None 128,501 130,699
Loan Prog. Rev. Bonds,
Sr. Ser. of 1994 B (AMT) (5)

15 Westchester County, NY, Industrial AA- 75,000 5.350 2005 08/01/01 74,679 74,663
Development Agency, Airport Facility @ 100.000
Revenue Bonds (Westchester Airport
Association, L.P. Project), 1994 Ser.
A (Canadian Imperial Bank of Commerce-
New York, Letter of Credit)
(AMT) (5) (7)

--------- --------- ---------
$ 6,405,000 $ 6,341,001 $ 6,449,483
========= ========= =========
</TABLE>

See Notes to Portfolio.

D - 9.
<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES - 226, DEFINED ASSET FUNDS

NOTES TO PORTFOLIO
As of February 29, 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) Bonds with an aggregate face amount of $1,085,000 have been
pre-refunded and are expected to be called for redemption on the
optional redemption provision dates shown.

(7) Certain bonds are covered by letters of credit which may expire prior
to the maturity dates of the bond. 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 - 10.

<PAGE>

DEFINED ASSET FUNDS--REGISTERED TRADEMARK--

<TABLE>
<S> <C>
HAVE QUESTIONS ? MUNICIPAL INVESTMENT TRUST FUND
Request the most recent free INTERMEDIATE TERM SERIES--226
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.
33-52017) 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.
14754--5/00
</TABLE>
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND
INTERMEDIATE TERM SERIES
DEFINED ASSET FUNDS
CONTENTS OF REGISTRATION STATEMENT

This Post-Effective Amendment to the Registration Statement on Form S-6
comprises the following papers and documents:

The facing sheet of Form S-6.

The cross-reference sheet (incorporated by reference to the Cross-Reference
Sheet to the Registration Statement of Defined Asset Funds Municipal Insured
Series, 1933 Act File No. 33-54565).

The Prospectus.

The Signatures.

The following exhibits:

1.1.1 -- Form of Standard Terms and Conditions of Trust Effective as of
October 21, 1993 (incorporated by reference to Exhibit 1.1.1 to the
Registration Statement of Municipal Investment Trust Fund, Multi-
state Series--48, 1933 Act File No. 33-50247).

1.11.1-- Merrill Lynch Code of Ethics (incorporated by reference to Exhibit
1.11.1 to the Post Effective Amendment No. 8 to the Registration
Statement of Municipal Investment Trust Fund, Insured Series 186,
1933 Act File No. 33-49159).

1.11.2-- Municipal Investment Trust Fund Code of Ethics (incorporated by
reference to Exhibit 1.11.2 to the Post Effective Amendment No. 8 to
the Registration Statement of Municipal Investment Trust Fund,
Insured Series 186, 1933 Act File No. 33-49159).

4.1 --Consent of the Evaluator.

5.1 --Consent of independent accountants.

9.1 -- Information Supplement (incorporated by reference to Exhibit 9.1 to
Amendment No. 1 to the Registration Statement of Municipal Investment
Trust Fund, Multistate Series--409, 1933 Act File No. 333-81777).

R-1
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND
INTERMEDIATE TERM SERIES--226
DEFINED ASSET FUNDS

SIGNATURES

PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT,
MUNICIPAL INVESTMENT TRUST FUND, INTERMEDIATE TERM SERIES--226, DEFINED ASSET
FUNDS, CERTIFIES THAT IT MEETS ALL OF THE REQUIREMENTS FOR EFFECTIVENESS OF THIS
REGISTRATION STATEMENT PURSUANT TO RULE 485(B) UNDER THE SECURITIES ACT OF 1933
AND HAS DULY CAUSED THIS REGISTRATION STATEMENT OR AMENDMENT TO THE REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED THEREUNTO DULY
AUTHORIZED IN THE CITY OF NEW YORK AND STATE OF NEW YORK ON THE 17TH DAY OF MAY,
2000.

SIGNATURES APPEAR ON PAGES R-3, R-4, R-5, R-6 AND R-7.

A majority of the members of the Board of Directors of Merrill Lynch,
Pierce, Fenner & Smith Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.

A majority of the members of the Board of Directors of Salomon Smith Barney
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.

A majority of the members of the Board of Directors of Prudential Securities
Incorporated has signed this Registration Statement or Amendment to the
Registration Statement pursuant to Powers of Attorney authorizing the person
signing this Registration Statement or Amendment to the Registration Statement
to do so on behalf of such members.

A majority of the members of the Executive Committee of the Board of
Directors of PaineWebber Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.

A majority of the members of the Board of Directors of Dean Witter Reynolds
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.

R-2
<PAGE>
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
DEPOSITOR

<TABLE>
<S> <C>
By the following persons, who constitute Powers of Attorney have been filed
a majority of under
the Board of Directors of Merrill Form SE and the following 1933 Act
Lynch, Pierce, File
Fenner & Smith Incorporated: Number: 333-70593
</TABLE>

GEORGE A. SCHIEREN
JOHN L. STEFFENS
By JAY M. FIFE
(As authorized signatory for Merrill Lynch, Pierce,
Fenner & Smith Incorporated and
Attorney-in-fact for the persons listed above)

R-3
<PAGE>
SALOMON SMITH BARNEY INC.
DEPOSITOR

<TABLE>
<S> <C>
By the following persons, who constitute a majority of Powers of Attorney
the Board of Directors of Salomon Smith Barney Inc.: have been filed
under the 1933 Act
File Numbers:
333-63417 and
333-63033
</TABLE>

MICHAEL A. CARPENTER
DERYCK C. MAUGHAN

By KEVIN E. KOPCZYNSKI
(As authorized signatory for
Salomon Smith Barney Inc. and
Attorney-in-fact for the persons listed above)

R-4
<PAGE>
PRUDENTIAL SECURITIES INCORPORATED
DEPOSITOR

<TABLE>
<S> <C>
By the following persons, who constitute a majority of Powers of Attorney
the Board of Directors of Prudential Securities have been filed
Incorporated: under Form SE and
the following 1933
Act File Numbers:
33-41631 and
333-15919
</TABLE>

ROBERT C. GOLDEN
ALAN D. HOGAN
A. LAURENCE NORTON, JR.
LELAND B. PATON
VINCENT T. PICA II
MARTIN PFINSGRAFF
HARDWICK SIMMONS
LEE B. SPENCER, JR.
BRIAN M. STORMS

By RICHARD R. HOFFMANN
(As authorized signatory for Prudential Securities
Incorporated and Attorney-in-fact for the persons
listed above)

R-5
<PAGE>
PAINEWEBBER INCORPORATED
DEPOSITOR

<TABLE>
<S> <C>
By the following persons, who constitute Powers of Attorney have been filed
the Board of Directors of PaineWebber under
Incorporated: the following 1933 Act File
Number: 33-55073
</TABLE>

MARGO N. ALEXANDER
TERRY L. ATKINSON
BRIAN M. BAREFOOT
STEVEN P. BAUM
MICHAEL CULP
REGINA A. DOLAN
JOSEPH J. GRANO, JR.
EDWARD M. KERSCHNER
JAMES P. MacGILVRAY
DONALD B. MARRON
ROBERT H. SILVER
MARK B. SUTTON
By ROBERT E. HOLLEY
(As authorized signatory for
PaineWebber Incorporated
and Attorney-in-fact for the persons listed above)

R-6
<PAGE>
DEAN WITTER REYNOLDS INC.
DEPOSITOR

<TABLE>
<S> <C>
By the following persons, who constitute Powers of Attorney have been filed
a majority of under Form SE and the following 1933
the Board of Directors of Dean Witter Act File Numbers: 33-17085,
Reynolds Inc.: 333-13039, 333-47553 and 333-89045
</TABLE>

BRUCE F. ALONSO
RICHARD M. DeMARTINI
RAYMOND J. DROP
JAMES F. HIGGINS
JOHN J. MACK
MITCHELL M. MERIN
STEPHEN R. MILLER
PHILIP J. PURCELL
JOHN H. SCHAEFER
THOMAS C. SCHNEIDER
ALAN A. SCHRODER
ROBERT G. SCOTT
By MICHAEL D. BROWNE
(As authorized signatory for
Dean Witter Reynolds Inc.
and Attorney-in-fact for the persons listed above)

R-7

EXHIBIT 4.1

STANDARD & POOR'S
A DIVISION OF THE McGRAW-HILL COMPANIES
J. J. KENNY
65 BROADWAY
NEW YORK, N.Y. 10006-2551
TELEPHONE (212) 770-4422
FAX 212/797-8681

May 17, 2000

Frank A. Ciccotto, Jr
Vice President
Tax-Exempt Evaluations

<TABLE>
<S> <C>
Merrill Lynch, Pierce, Fenner & Smith
Incorporated
Defined Asset Funds
P.O. Box 9051
Princeton, New Jersey 08543-9051

The Chase Manhattan Bank
4 New York Plaza--6th Floor
New York, New York 10081
</TABLE>

RE: MUNICIPAL INVESTMENT TRUST FUND,
INTERMEDIATE TERM SERIES--226, DEFINED ASSET FUNDS

Gentlemen:

We have examined the post-effective Amendment to the Registration Statement
File No. 33-52017 for the above-captioned trust. We hereby acknowledge that
Kenny S&P Evaluation Services, a division of J. J. Kenny Co., Inc. is currently
acting as the evaluator for the trust. We hereby consent to the use in the
Amendment of the reference to Kenny S&P Evaluation Services, a division of J. J.
Kenny Co., Inc. as evaluator.

In addition, we hereby confirm that the ratings indicated in the
above-referenced Amendment to the Registration Statement for the respective
bonds comprising the trust portfolio are the ratings currently indicated in our
KENNYBASE database.

You are hereby authorized to file copies of this letter with the Securities
and Exchange Commission.

Sincerely,
FRANK A. CICCOTTO
Vice President

Exhibit 5.1
CONSENT OF INDEPENDENT ACCOUNTANTS

The Sponsors and Trustee of
Municipal Investment Trust Fund--Intermediate Term Series--226, Defined Asset
Funds

We consent to the use in this Post-Effective Amendment No. 7 to Registration
Statement No. 33-52017 of our opinion dated May 10, 2000 appearing in the
Prospectus, which is part of such Registration Statement, and to the reference
to us under the heading "How the Fund Works--Auditors" in such Prospectus.

DELOITTE & TOUCHE LLP
New York, N.Y.
May 17, 2000