<PAGE>
DEFINED ASSET FUNDSSM
- --------------------------------------------
- -----------------------------------
MUNICIPAL INVESTMENT TRUST FUND
INSURED SERIES--307
(A UNIT INVESTMENT TRUST)
O PORTFOLIO OF INSURED LONG TERM MUNICIPAL BONDS
O DESIGNED FOR FEDERALLY TAX-FREE INCOME
O MONTHLY INCOME DISTRIBUTIONS
SPONSORS:
Merrill Lynch,
Pierce, Fenner & Smith -------------------------------------------------
Incorporated The Securities and Exchange Commission has not
Salomon Smith Barney Inc. approved or disapproved these Securities or
PaineWebber Incorporated passed upon the adequacy of this prospectus. Any
Dean Witter Reynolds Inc. representation to the contrary is a criminal
Prudential Securities offense.
Incorporated Prospectus dated October 30, 1998.
<PAGE>
- --------------------------------------------------------------------------------
Def ined Asset FundsSM
For more than 25 years, Defined Asset FundsSM has been a leader in unit
investment trust research and product innovation. Our family of 'DefinedSM'
Funds helps investors work toward their financial goals with a full range of
quality investments, including municipal, corporate and government bond
portfolios, as well as domestic and international equity portfolios.
Defined Asset Funds offer a number of advantages:
o Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
funds are not managed and portfolio changes are limited.
o Preselected Portfolios: We choose the stocks and bonds in advance, so you know
what you're investing in.
o Professional research: Our dedicated research team seeks out stocks or bonds
appropriate for a particular fund's objectives.
o Ongoing supervision: We monitor each portfolio on an ongoing basis.
No matter what your investment goals, tolerance for risk or time horizon,
there's probably a Defined Asset Fund that suits your investment style. Your
financial professional can help you select a Defined Asset Fund that works best
for your investment portfolio.
THE FINANCIAL INFORMATION IN THIS PROSPECTUS IS AS OF THE EVALUATION DATE, JULY
31, 1998.
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............................ 9
Sponsors' Secondary Market.......................... 9
Selling Units to the Trustee........................ 9
Exchange Option..................................... 10
How The Fund Works..................................... 10
Pricing............................................. 10
Evaluations......................................... 11
Income.............................................. 11
Expenses............................................ 11
Portfolio Changes................................... 12
Fund Termination.................................... 12
Certificates........................................ 12
Trust Indenture..................................... 12
Legal Opinion....................................... 13
Auditors............................................ 13
Sponsors............................................ 14
Trustee............................................. 14
Underwriters' and Sponsors' Profits................. 14
Public Distribution................................. 14
Code of Ethics...................................... 14
Year 2000 Issues.................................... 15
Taxes.................................................. 15
Supplemental Information............................... 16
Financial Statements................................... D-1
2
<PAGE>
- --------------------------------------------------------------------------------
RISK/RETURN SUMMARY
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 insured municipal revenue bonds.
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?
O The Fund plans to hold to maturity 12 insured long-term
tax-exempt municipal bonds with a current aggregate face
amount of $10,030,000 including some short-term bonds
reserved to pay the deferred sales charge. The Fund is a
unit investment trust which means that, unlike a mutual
fund, the Fund's portfolio is not managed. The bonds are
rated AAA or Aaa by Standard & Poor's, Moody's or Fitch.
o 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.
o 100% of the bonds are insured by insurance companies.
Insurance guarantees 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:
APPROXIMATE
PORTFOLIO
PERCENTAGE
o General Obligation 21%
o Hospitals/Health Care 39%
o Municipal Water/Sewer Utilities 20%
o State/Local Municipal Electric Utilities 9%
o Refunded Bonds 1%
o Universities/Colleges 10%
4. WHAT ARE THE SIGNIFICANT RISKS?
YOU CAN LOSE MONEY BY INVESTING IN THE FUND. THIS CAN
HAPPEN FOR VARIOUS REASONS, INCLUDING:
o Rising interest rates, an issuer's worsening financial
condition or a drop in bond ratings can reduce the price of
your units.
o Because the Fund is concentrated in hospital/health care
bonds, adverse developments in this sector may affect the
value of your Units.
o Assuming no changes in interest rates, when you sell your
units, they will generally be worth less than your cost
because your cost included a sales fee.
o The Fund will receive early returns of principal if 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.
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 or if you cannot tolerate any risk.
3
<PAGE>
DEFINING YOUR INCOME
WHAT YOU MAY EXPECT (PAYABLE ON THE 25TH DAY OF
EACH MONTH):
Regular Monthly Income per unit $ 4.32
Annual Income per unit $ 51.91
RECORD DAY: 10th day of each month
These figures are estimates on the evaluation date; actual
payments may vary.
6. WHAT ARE THE FUND'S FEES AND EXPENSES?
This table shows the costs and expenses you may pay,
directly or indirectly, when you invest in the Fund.
INVESTOR FEES
2.90%
Maximum Sales Fee (Load) on new purchases (as a
percentage of $1,000 invested)
You will pay an up-front sales fee of 1.125% as well as a
deferred sales fee of $3.75 per unit quarterly November,
February, May and August, through August, 2000.
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:
YOUR MAXIMUM
SALES FEE
IF YOU INVEST: WILL BE:
------------------------------ ---------------------
Less than $100,000 2.90%
$100,000 to $249,999 2.65%
$250,000 to $499,999 2.40%
$500,000 to $999,999 2.15%
$1,000,000 and over 1.90%
Maximum Exchange Fee 1.90%
ESTIMATED ANNUAL FUND OPERATING
EXPENSES
AMOUNT
PER UNIT
$ 0.72
Trustee's Fee
$ 0.46
Portfolio Supervision,
Bookkeeping and
Administrative Fees
$ 0.20
Organization Costs
$ 0.13
Evaluator's Fee
$ 0.36
Other Operating Expenses
$ 1.87
TOTAL
7. HOW HAVE SIMILAR FUNDS PERFORMED IN THE PAST?
In the following chart we show past performance of prior
municipal Insured Series, which had the same investment
objectives, strategies and types of bonds as this Fund.
These prior Insured Series were offered between January 5,
1988 and October 17, 1996 and were outstanding on September
30, 1998. 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 9/30/98.
WITH SALES FEE NO SALES FEE
1 YEAR 5 YEARS 10 YEARS 1 YEAR 5 YEARS 10 YEARS
- -------------------------------------------------------------------
High 6.13% 5.22% 7.44% 11.22% 6.40% 7.96%
Average 4.17 4.43 7.29 7.57 5.46 7.88
Low 0.91 3.88 7.19 3.07 4.81 7.79
- -------------------------------------------------------------------
Average
Sales fee 3.30% 5.15% 5.71%
- -------------------------------------------------------------------
Note: All returns represent changes in unit price with distributions reinvested
into the Municipal Fund Investment Accumulation Program.
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?
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.
The minimum investment is $250.
4
<PAGE>
UNIT PRICE PER UNIT $1,058.47
(as of July 31, 1998)
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.
UNIT PAR VALUE $1,000.00
Unit par value means the total amount of money you should
generally receive on each unit by the termination of the
Fund (other than interest and premium on the bonds). This
total amount assumes that all bonds in the Fund are either
paid at maturity or called by the issuer at par or are sold
by the Fund at par. If you sell your units before the Fund
terminates, you may receive more or less than the unit par
value.
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, less any remaining deferred
sales fee. 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.
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 at no sales
fee in the Municipal Fund Investment Accumulation Program,
Inc. This Program is an open-end mutual fund with a
comparable investment objective, but those bonds generally
will not be insured. 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.
5
<PAGE>
- --------------------------------------------------------------------------------
TAX-FREE VS. TAXABLE INCOME: A COMPARISON OF TAXABLE AND TAX-FREE YIELDS
<TABLE><CAPTION>
EFFECTIVE
TAXABLE INCOME 1998* % TAX TAX-FREE YIELD OF
SINGLE RETURN JOINT RETURN BRACKET 3% 3.5% 4% 4.5% 5% 5.5% 6% 6.5%
IS EQUIVALENT TO A TAXABLE YIELD OF
- ----------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C>
$ 0- 25,350 $ 0- 42,350 15.00 3.53 4.12 4.71 5.29 5.88 6.47 7.06 7.65
- ----------------------------------------------------------------------------------------------------------
$ 25,351- 61,400 $ 42,351-102,300 28.00 4.17 4.86 5.56 6.25 6.94 7.64 8.33 9.03
- ----------------------------------------------------------------------------------------------------------
$ 61,401-128,100 $102,301-155,950 31.00 4.35 5.07 5.80 6.52 7.25 7.97 8.70 9.42
- ----------------------------------------------------------------------------------------------------------
$128,101-278,450 $155,951-278,450 36.00 4.69 5.47 6.25 7.03 7.81 8.59 9.38 10.16
- ----------------------------------------------------------------------------------------------------------
OVER $278,450 OVER $278,450 39.60 4.97 5.79 6.62 7.45 8.28 9.11 9.93 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 1998 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.
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:
o elimination of one or more bonds from the Fund's portfolio because of
calls, redemptions or sales;
o a change in the Fund's expenses; or
o 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):
Estimated Annual Estimated
Interest Income - Annual Expenses
- -------------------------------------------------
Unit Price
Estimated Long Term Return is a measure of the estimated return over the
estimated life of the Fund. Unlike Estimated Current Return, Estimated Long Term
Return reflects maturities, discounts and premiums of the 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:
o a monthly statement of income payments and any principal payments;
o a notice from the Trustee when new bonds are deposited in exchange or
substitution for bonds originally deposited;
o an annual report on Fund activity; and
o annual tax information. This will also be sent to the IRS. You must report the
amount of tax-exempt interest received during the year.
You may request:
o copies of bond evaluations to enable you to comply with federal and state tax
reporting requirements; and
o audited financial statements of the Fund.
You may inspect records of Fund transactions at the Trustee's office during
regular business hours.
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, an issuer might call its bonds if it no longer needs the money for
the original purpose or, during periods of falling interest rates, if the
issuer's bonds have a coupon higher than current market rates. 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 hospital and
health care bonds.
o 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;
o hospitals face increasing competition resulting from hospital mergers and
affiliations;
o hospitals need to reduce costs as HMOs increase market penetration and
hospital supply and drug companies raise prices; and
o hospitals and health care providers are subject to various legal claims by
patients and others and are adversely affected by increasing costs of
insurance.
o 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.
o 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 profitability.
o Most retirement/nursing home providers rely on entrance fees for operating
revenues. If people live longer than expected and
8
<PAGE>
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
The bonds are backed by insurance companies (as shown under Defined 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 AAA 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:
o limiting real property taxes,
o reducing tax rates,
o imposing a flat or other form of tax, or
o 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:
o adding the value of the bonds, net accrued interest, cash and any other
Fund assets;
o subtracting accrued but unpaid Fund expenses, unreimbursed Trustee
advances, cash held to buy back units or for distribution to investors and
any other Fund liabilities; and
o dividing the result by the number of outstanding units.
Your net asset value when you sell may be more or less than your cost because of
sales fees, market movements and changes in the portfolio.
If you sell your units before the final deferred sales fee installment, the
amount of any remaining installments will be deducted from your proceeds.
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 other than any remaining deferred sales charge.
We may resell the units to other buyers or to the Trustee. You should consult
your financial professional for current market prices to determine if other
broker-dealers or banks are offering higher prices.
We have maintained a secondary market continuously for over 25 years, but we
could discontinue it without prior notice for any business reason.
SELLING UNITS TO THE TRUSTEE
Regardless of whether we maintain a secondary market, you can sell your units to
the Trustee at any time by sending the Trustee a letter (with any
9
<PAGE>
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 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:
o if the New York Stock Exchange is closed (other than customary weekend and
holiday closings);
o if the SEC determines that trading on the New York Stock Exchange is
restricted or that an emergency exists making sale or evaluation of the
bonds not reasonably practicable; and
o for any other period permitted by SEC order.
EXCHANGE OPTION
You may exchange units of certain Defined Asset Funds for units of this Fund at
a maximum exchange fee of 1.90%. 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.
10
<PAGE>
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:
o cost of initial preparation of legal documents;
o federal and state registration fees;
o initial fees and expenses of the Trustee;
o initial audit; and
o legal expenses and other out-of-pocket expenses.
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 Reserve Account by withdrawing from
these accounts amounts it considers appropriate to pay any material liability.
These accounts do not bear interest.
EXPENSES
The Trustee is paid monthly. It also benefits when it holds cash for the Fund in
non-interest bearing accounts. The Trustee may also receive additional amounts:
o to reimburse the Trustee for the Fund's operating expenses;
o for extraordinary services and costs of indemnifying the Trustee and the
Sponsors;
o costs of actions taken to protect the Fund and other legal fees and
expenses;
o expenses for keeping the Fund's registration statement current; and
o Fund termination expenses and any governmental charges.
The Sponsors are currently reimbursed up to 45 cents per $1,000 face amount
annually for providing portfolio supervisory, bookkeeping and administrative
services and for any other expenses properly chargeable to the Fund. While this
fee may exceed the amount of these costs and expenses attributable to this Fund,
the total of these fees for all Series of Defined Asset Funds will not exceed
the aggregate amount attributable to all of these Series for any calendar year.
The Fund also pays the Evaluator's fees.
11
<PAGE>
The Trustee's, Sponsors' and Evaluator's fees may be adjusted for inflation
without investors' approval.
Any quarterly deferred sales charges you owe are paid with interest and
principal from certain bonds. If these amounts are not enough, the rest will be
paid out of distributions to you from the Fund's Capital and Income Accounts.
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 will affect the size
and 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:
o diversity of the portfolio;
o size of the Fund relative to its original size;
o ratio of Fund expenses to income;
o current and long-term returns;
o degree to which units may be selling at a premium over par; and
o cost of maintaining a current prospectus.
FUND TERMINATION
The Fund will terminate following the stated maturity or sale of the last 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 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
12
<PAGE>
Sponsors, the Trustee and the Evaluator, which sets forth their duties and
obligations and your rights. A copy of the Indenture is available to you on
request to the Trustee. The following summarizes certain provisions of the
Indenture.
The Sponsors and the Trustee may amend the Indenture without your consent:
o to cure ambiguities;
o to correct or supplement any defective or inconsistent provision;
o to make any amendment required by any governmental agency; or
o to make other changes determined not to be materially adverse to your best
interest (as determined by the Sponsors).
Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.
The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
o it fails to perform its duties and the Sponsors determine that its
replacement is in your best interest; or
o it becomes incapable of acting or bankrupt or its affairs are taken over by
public authorities.
Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee without the consent of
investors. The resignation or removal of either becomes effective when a
successor accepts appointment. The Sponsors will try to appoint a successor
promptly; however, if no successor has accepted within 30 days after notice of
resignation, the resigning Trustee or Evaluator may petition a court to appoint
a successor.
Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
o remove it and appoint a replacement Sponsor;
o liquidate the Fund; or
o continue to act as Trustee without a Sponsor.
Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as agent for the
Sponsors.
The Trust Indenture contains customary provisions limiting the liability of the
Trustee, the Sponsors and the Evaluator.
LEGAL OPINION
Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
special counsel for the Sponsors, has given an opinion that the units are
validly issued.
AUDITORS
Deloitte & Touche LLP, 2 World Financial Center, New York, New York 10281,
independent accountants, audited the Statement of Condition included in this
prospectus.
13
<PAGE>
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 The
Travelers 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 Bank of New York, 101 Barclay Street,
17 W, New York, New York 10268, 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.
CODE OF ETHICS
Merrill Lynch, as agent for the Sponsors, has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its employees
with access to information on portfolio transactions. The goal of the code is to
prevent fraud, deception or misconduct against the Fund and to provide
reasonable standards of conduct.
14
<PAGE>
YEAR 2000 ISSUES
Many computer systems were designed in such a way that they may be unable to
distinguish between the year 2000 and the year 1900 (commonly known as the 'Year
2000 Problem'). We do not expect that the computer system changes necessary to
prepare for the Year 2000 will cause any major operational difficulties for the
Fund.
TAXES
The following summary describes some of the important income tax consequences of
holding units. It assumes that you are not a dealer, financial institution,
insurance company or other investor with special circumstances. You should
consult your own tax adviser about your particular circumstances.
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 federal
alternative minimum tax. 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.
INCOME 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 if you held
it for one year or less. If you are an individual and sell your units after
holding them for more than 12 months, you may be entitled to a 20% maximum
federal tax rate on any resulting gains. Consult your tax adviser in this
regard. Because the deductibility of capital losses is subject to limitations,
you may not be able to deduct all of your capital losses.
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
15
<PAGE>
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.
16
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
REPORT OF INDEPENDENT ACCOUNTANTS
The Sponsors, Trustee and Holders
of Municipal Investment Trust Fund,
Insured Series - 307,
Defined Asset Funds:
We have audited the accompanying statement of condition of Municipal
Investment Trust Fund, Insured Series - 307, Defined Asset Funds,
including the portfolio, as of July 31, 1998 and the related
statements of operations and of changes in net assets for the period
August 22, 1997 to July 31, 1998. These financial statements are the
responsibility of the Trustee. Our responsibility is to express an
opinion on these financial statements based on our audit.
We conducted our audit 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 July 31, 1998, as shown in
such portfolio, were confirmed to us by The Bank of New York, 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 audit provides 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, Insured Series - 307, Defined Asset Funds at
July 31, 1998 and the results of its operations and changes in its
net assets for the above-stated period in conformity with generally
accepted accounting principles.
DELOITTE & TOUCHE LLP
New York, N.Y.
October 6, 1998
D - 1
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
STATEMENT OF CONDITION
AS OF JULY 31, 1998
<TABLE>
<S> <C> <C>
TRUST PROPERTY:
Investment in marketable securities - at value
(cost $9,911,978)(Note 1)...................... $10,201,173
Accrued interest receivable...................... 138,226
Accrued interest on segregated bonds............. 7,085
Deferred organization costs (Note 6)............. 8,074
_____________
Total trust property................. 10,354,558
LESS LIABILITIES:
Advance from Trustee............................. $ 20,720
Deferred sales charge (Note 5)................... 54,008
Accrued expenses................................. 5,234 79,962
_____________ _____________
NET ASSETS, REPRESENTED BY:
9,746 units of fractional undivided
interest outstanding (Note 3).................. 10,243,475
Undistributed net investment income.............. 31,121
_____________
$10,274,596
=============
UNIT VALUE ($10,274,596/9,746 units)............... $1,054.24
=============
</TABLE>
See Notes to Financial Statements.
D - 2
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
STATEMENT OF OPERATIONS
<TABLE>
<CAPTION>
August 22,
1997
to
July 31,
1998
_____________
<S> <C>
INVESTMENT INCOME:
Interest income............................. $509,749
Interest income on segregated bonds (Note 5) 16,375
Trustee's fees and expenses................. (10,566)
Sponsors' fees.............................. (4,380)
Organizational expenses.(Note 6)............ (2,019)
_____________
Net investment income....................... 509,159
_____________
REALIZED AND UNREALIZED GAIN (LOSS)
ON INVESTMENTS:
Realized loss on securities sold
or redeemed............................... (338)
Unrealized appreciation of investments...... 289,195
_____________
Net realized and unrealized gain on
investments............................... 288,857
_____________
NET INCREASE IN NET ASSETS RESULTING
FROM OPERATIONS............................. $798,016
=============
</TABLE>
See Notes to Financial Statements.
D - 3
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
STATEMENT OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>
August 22,
1997
to
July 31,
1998
_____________
<S> <C>
OPERATIONS:
Net investment income....................... $ 509,159
Realized loss on securities sold
or redeemed............................... (338)
Unrealized appreciation of investments...... 289,195
_____________
Net increase in net assets resulting
from operations........................... 798,016
_____________
INCOME DISTRIBUTIONS TO HOLDERS (Note 2)...... (460,702)
DEFERRED SALES CHARGE (Note 5)................ (125,258)
CAPITAL SHARE TRANSACTIONS - Redemptions of
347 units................................... (352,249)
_____________
NET DECREASE IN NET ASSETS.................... (140,193)
NET ASSETS AT BEGINNING OF PERIOD............. 10,414,789
_____________
NET ASSETS AT END OF PERIOD................... $10,274,596
=============
PER UNIT:
Income distributions during period.......... $46.05
=============
Net asset value at end of period............ $1,054.24
=============
TRUST UNITS OUTSTANDING AT END OF PERIOD...... 9,746
=============
</TABLE>
See Notes to Financial Statements.
D - 4
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
NOTES TO FINANCIAL STATEMENTS
1. SIGNIFICANT ACCOUNTING POLICIES
The Fund is registered under the Investment Company Act of 1940 as
a Unit Investment Trust. The following is a summary of significant
accounting policies consistently followed by the Fund in the
preparation of its financial statements. The policies are in
conformity with generally accepted accounting principles.
(a) Securities are stated at value as determined by the Evaluator
based on bid side evaluations for the securities (see "How to
Sell Units - Trustee's Redemption of Units" in this Prospectus,
Part B), except that value on August 22, 1997 was based upon
offer side evaluations at August 20, 1997, the day prior to the
Date of Deposit. Cost of securities at August 22, 1997 was also
based on such offer 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 distributed as explained
in "Income, Distributions and Reinvestment - Distributions" in this
Prospectus, Part B.
3. NET CAPITAL
<TABLE>
<S> <C>
Cost of 9,746 units at Date of Deposit.............. $10,056,725
______________
Net amount applicable to Holders.................... 10,056,725
Redemptions of units - net cost of 347 units
redeemed less redemption amounts.................. 6,776
Realized loss on securities sold or redeemed........ (338)
Interest income on segregated bonds................. 16,375
Deferred sales charge............................... (125,258)
Unrealized appreciation of investments.............. 289,195
______________
Net capital applicable to Holders................... $10,243,475
==============
</TABLE>
4. INCOME TAXES
As of July 31, 1998, unrealized appreciation of investments, based
on cost for Federal income tax purposes, aggregated $289,195, all of
which related to appreciated securities. The cost of investment
securities for Federal income tax purposes was $9,911,978 at
July 31, 1998.
D - 5
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
NOTES TO FINANCIAL STATEMENTS
5. DEFERRED SALES CHARGE
The sales charges are being paid for with the interest received
and by periodic sales of certain bonds. A deferred sales charge
of $3.75 per unit is charged on a quarterly basis, and paid to the
sponsors annually by the Trustee on behalf of the Holders, up to an
aggregate of $45.00 per unit over the first three years of the life
of the Fund. Should a Holder redeem units prior to the third
anniversary of the Fund, the remaining balance of the deferred sales
charge will be charged.
6. DEFERRED ORGANIZATIONAL COSTS
Organizational costs have been deferred and are being amortized over
five years.
D - 6
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
PORTFOLIO
AS OF JULY 31, 1998
<TABLE><CAPTION>
Rating Optional
Portfolio No. and Title of of Face Redemption
Securities(4) Issues(1) Amount Coupon Maturities(3) Provisions(3) Cost(2) Value(2)
_____________ _________ ______ ______ _____________ _____________ _______ ________
<S> <C> <C> <C> <C> <C> <C> <C>
1 The Util. Bd. of the City of AAA $ 905,000 5.500% 2022 02/01/07 $ 908,783 $ 939,372
Tuskegee, AL, Util. Rev. Rfdg. @ 102.000
Bonds, Ser. 1997 (AMBAC Ins.)
2 Pace Prop. Fin. Auth., Inc., FL, AAA 1,000,000 5.375 2020 09/01/07 977,380 1,017,080
(Util. Sys. Imp. and Rfdg. Rev. @ 102.000
Bonds), Ser. 1997 (AMBAC Ins.)
3 Illinois Hlth. Facs. Auth., Rev. Aaa(m) 100,000 3.900 1998 None 100,000 100,008
Rfdg. Bonds (Little Co. of Mary 135,000 4.200 1999 None 135,126 135,616
Hosp. and Hlth. Care Ctr.), Ser.
1997 (MBIA Ins.) (6)
4 Illinois Hlth. Facs. Auth., Rev. AAA 755,000 6.250 2020 11/15/06 815,068 831,074
Rfdg. Bonds (Rush-Presbyterian-St. @ 102.000
Luke's Med. Ctr. Obligated Grp.),
Ser. 1996 A (MBIA Ins.)
5 City of Chicago, IL, G.O. Bonds, AAA 1,000,000 5.125 2025 01/01/06 960,850 980,800
Proj. and Rfdg. Ser. 1995 B @ 102.000
(Financial Guaranty Ins.)
6 Borough of Milltown, Cnty. of AAA 135,000 4.750 2000 None 137,281 137,505
Middlesex, NJ, G.O. Bonds (FSA Ins.)
(6)
7 Bedford Area Sch. Dist., Bedford AAA 1,000,000 5.300 2024 04/15/04 978,960 1,005,780
Cnty., PA, G.O. Bonds, Rfdg. Ser. @ 100.000
1997 (Financial Guaranty Ins.)
8 Lehigh Cnty., PA, Gen. Purp. Auth., AAA 105,000 5.625 2025(5) 07/01/05 105,981 114,610
Hosp. Rev. Bonds (Lehigh Valley @ 102.000
Hosp.), Ser. 1995 B (MBIA Ins.) 895,000 5.625 2025 07/01/05 903,359 927,658
@ 102.000
</TABLE>
D - 7
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
PORTFOLIO
AS OF JULY 31, 1998
<TABLE><CAPTION>
Rating Optional
Portfolio No. and Title of of Face Redemption
Securities(4) Issues(1) Amount Coupon Maturities(3) Provisions(3) Cost(2) Value(2)
_____________ _________ ______ ______ _____________ _____________ _______ ________
<S> <C> <C> <C> <C> <C> <C> <C>
9 Tyler Hlth. Facs. Dev. Corp., TX, AAA $ 1,000,000 5.600% 2027 11/01/07 $ 1,004,290 $ 1,041,450
Hosp. Rev. Bonds (East Texas Med. @ 102.000
Ctr. Reg. Healthcare Sys. Proj.),
Ser. 1997 B (FSA Ins.)
10 Utah Cnty., UT, Hosp. Rev. Bonds AAA 1,000,000 5.250 2026 08/15/07 971,010 991,280
(IHC Hlth. Svc., Inc.), Ser. 1997 @ 101.000
(MBIA Ins.)
11 Upper Occoquan Sewerage Auth., VA, AAA 1,000,000 4.750 2029 07/01/06 901,600 934,030
Regl. Sewerage Sys. Rev. Bonds, Ser. @ 100.000
1995 A (MBIA Ins.)
12 Washington Higher Educ. Fac. Auth., AAA 1,000,000 5.700 2026 11/01/06 1,012,290 1,044,910
Rev. and Rfdg. Rev. Bonds, (Pacific @ 102.000
Lutheran Univ. Proj.) Ser. 1996
(Connie Lee Ins.)
______________ ____________ ____________
TOTAL $10,030,000 $9,911,978 $10,201,173
============== ============ ============
</TABLE>
See Notes to Portfolio.
D - 8
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
NOTES TO PORTFOLIO
AS OF JULY 31, 1998
(1) The ratings of the bonds are 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)"; "NR" indicates that this bond is not currently rated by
any of the above-mentioned rating services. These ratings have
been furnished by the Evaluator but not confirmed with
the rating agencies. A description of the rating symbols and
their meanings appears under "Descriptions of Ratings" in this
Prospectus, Part B.
(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. The tax effect on Holders of redemptions and
related distributions is described under "Taxes" in this
Prospectus, Part B.
(4) Insured by the indicated municipal bond insurance company. See
"Risk Factors - Bonds Backed by Letters of Credit or
Insurance" in this Prospectus, Part B.
(5) Bonds with an aggregate face amount of $105,000 have been
pre-refunded and are expected to be called for redemption on
the optional redemption provision date shown.
D - 9
<PAGE>
MUNICIPAL INVESTMENT TRUST FUND,
INSURED SERIES - 307,
DEFINED ASSET FUNDS
NOTES TO PORTFOLIO
AS OF JULY 31, 1998
(6) It is anticipated that interest and principal received from
these bonds will be applied to the payment of the Fund's
deferred sales charges.
D - 10
<PAGE>
Defined
Asset FundsSM
HAVE QUESTIONS ? MUNICIPAL INVESTMENT TRUST FUND
Request the most recent free INSURED SERIES--307
Information Supplement (A Unit Investment Trust)
that gives more details about ---------------------------------------
the Fund, by calling: This Prospectus does not contain
The Bank of New York complete information about the
1-800-221-7771 investment company filed with the
Securities and Exchange Commission in
Washington, D.C. under the:
o Securities Act of 1933 (file no.
333-27385) and
o 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.
11318--10/98
