THORNBURG INVESTMENT TRUST
497K3A, 1999-07-23
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THORNBURG                                            Rule 497(k)(1)(iii)(A)
INTERMEDIATE
MUNICIPAL
FUND


<logo>

Fund Profile
July 1, 1999

This Profile summarizes key information about the Fund that is included in
the Fund's Prospectus.  The Fund's Prospectus includes additional
information about the Fund, including a more detailed description of the
risks associated with investing in the Fund that you may want to consider
before you invest.  You may obtain the Prospectus and other information
about the Fund at no cost by calling 800-847-0200.

<PAGE>
Investment Goals

The Fund's primary goal is providing as high a level of current income
exempt from federal individual income tax as is consistent, in the view of
the Fund's investment adviser, with preservation of capital.  Its secondary
goal is to reduce fluctuations in its share price relative to long-term
municipal bond portfolios.  No assurance can be given that these goals will
be achieved.

Principal Investment Strategies of the Fund

The Fund pursues its primary goal by investing principally in a laddered
maturity portfolio of municipal obligations which are issued by states and
state agencies and local governments and their agencies and by United
States territories and possessions.  The Fund invests in obligations which
are rated as investment grade or, if unrated, which are issued by obligors
which have comparable investment grade obligations outstanding or which are
deemed by the Fund's investment adviser to be comparable to obligors with
outstanding investment grade obligations.  The Fund pursues its secondary
goal of reducing share price fluctuations by maintaining a dollar-weighted
average portfolio maturity of normally three to ten years.

Thornburg Management Company, Inc. (TMC) actively manages the Fund's
portfolio.  Investment decisions are based upon outlooks for interest rates
and securities markets, the supply of municipal debt securities, and
analysis of specific securities.

The Fund ordinarily will acquire securities for investment rather than for
realization of gains on market fluctuations.  However, it may dispose of
any security prior to its scheduled maturity to enhance income or reduce
loss, to change the portfolio's average maturity, or to otherwise respond
to current market conditions.  The objective of preserving capital may
prevent the Fund from obtaining the highest yields available.

Additional information about the Fund's investments is available in the
Fund's Annual and Semiannual Reports to Shareholders.  In the Fund's
Prospectus you will find a discussion of the market conditions and
investment strategies which significantly affected the Fund's performance
during the last fiscal year.  You may obtain copies of the Fund's most
recent Annual and Semiannual Reports and Prospectus at no cost by calling
the Fund's Distributor, Thornburg Securities Corporation, at (800)
847-0200.

Principal Risks

The value of the Fund's shares and its dividends will fluctuate in response
to changes in interest rates.  When interest rates increase, the value of
the Fund's investments declines and the Fund's share value is reduced.
Dividends also will vary over time.  During periods of declining interest
rates the Fund's dividends decline.  The value of Fund shares also could be
reduced if municipal obligations held by the Fund were downgraded by rating
agencies, or went into default, or if legislation or other government
action reduces the ability of issuers to pay principal and interest when
due or changes the tax treatment of interest on municipal obligations.  A
portion of the Fund's dividends could be subject to the federal alternative
minimum tax.  The loss of money is a risk of investing in the Fund, and
when you sell your shares they may be worth less than what you paid for
them.

An investment in the Fund is not a deposit in any bank and is not insured
or guaranteed by the Federal Deposit Insurance Corporation or any other
government agency.

Past Performance of the Fund

The following information provides some indication of the risks of
investing in the Fund by showing how the Fund's investment results vary.
The bar chart shows how the annual total returns for Class A shares have
been different in each full year shown, and the average annual total return
figures compare Class A and Class C share performance to the Merrill Lynch
Municipal (7-12 years) Bond Index, a broad measure of market performance.
Performance in the past is not necessarily an indication of how the Fund
will perform in the future.

<The following are presented as bar graphs in the Profile>
Intermediate National Fund Annual Total Returns Class A Shares
- ------------------------------------------------------------
20%

15%
             12.29         13.22
10%   9.81
                                                5.47
 5%
                                  4.45
 0%                                      0.72
                   (2.48)
- -5
      1992   1993   1994   1995   1996   1997   1998

Year to date return for period ended 6/30/99: (1.05)%.

Highest quarterly results for time period shown: 4.91% (quarter ended
3/31/95).
Lowest quarterly results for time period shown: (3.33)% (quarter ended
3/31/94).

The sales charge for Class A shares is not reflected in the returns shown
above in the bar chart, and the returns would be less if the charge was
taken into account.

Intermediate National Fund Average Annual Total Returns
- -----------------------------------------------------
(periods ended 12/31/98)

                         One Year   Five Years  Since Inception
                         --------   ----------  ---------------
    Class A Shares         3.34%     5.03%       6.95% (7/23/91)
    Merrill Lynch Index    6.83%     6.27%       7.48%

    Class C Shares         5.04%     N/A         6.04% (9/1/94)
    Merrill Lynch Index    6.83%     N/A         7.63%

Fees and Expenses of the Fund

The following tables describe the fees and expenses you may pay if you buy
and hold shares of the Fund.

Shareholder Fees (Fees Paid Directly From Your Investment)

                                                      Class A    Class C
                                                      -------    -------
     Maximum Sales Charge (Load) on Purchases          2.00%      none
     (as a percentage of offering price)
     Maximum Deferred Sales Charge (Load)
     on Redemptions                                    0.50%*     0.60%**
     (as a percentage of redemption proceeds or
      original purchase price, whichever is lower)
 * Imposed only on redemptions of purchases greater than $1 million in
   the event of a redemption within 12 months of purchase.
** Imposed only on redemptions of Class C shares within 12 months
   of purchase.

Annual Fund Operating Expenses (Expenses That Are Deducted
- ------------------------------  From Fund Assets)

                                              Class A    Class C
                                              -------    -------
     Management Fee                             .50%       .50%
     Distribution and Service (12b-1) Fees      .25%      1.00%
     Other Expenses                             .29%       .43%
                                                ----      -----
         Total Annual Fund Operating Expenses  1.04%*     1.93%*

*Thornburg Management Company, Inc (TMC) intends to reimburse a portion of
the Class A other expenses, so that actual Class A other expenses are .25%,
and actual total fund operating expenses are 1.00%.  TMC and Thornburg
Securities Corporation (TSC) intend to waive a portion of the Class C 12b-1
fees, and TMC intends to reimburse a portion of the Class C other expenses,
so that actual Class C 12b-1 expenses are .60%, actual Class C other
expenses are .30%, and actual total fund operating expenses for Class C are
1.40%.  Waiver of fees and reimbursement of expenses may be terminated at
any time.

Example.  This Example is intended to help you compare the cost of
investing in the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Fund for the time
periods indicated and redeem all of your shares at the end of these
periods.  The Example also assumes that your investment has a 5% return
each year, that dividends and distributions are reinvested, and that the
Fund's operating expenses remain the same.  Although your actual costs may
be higher or lower, based on these assumptions your costs would be:

                       1 Year  3 Years  5 Years  10 Years
                       ------  -------  -------  --------
     Class A Shares     $304     $526     $777    $1,458
     Class C Shares      258      613    1,054     2,283

You would pay the following expenses if you did not redeem your Class C
shares:

                       1 Year  3 Years  5 Years  10 Years
                       ------  -------  -------  --------
     Class C Shares      198      613    1,054     2,283

Investment Adviser and Portfolio Managers

The Fund's investment adviser is Thornburg Management Company, Inc. (TMC),
providing investment management and administrative services.  Brian J.
McMahon and George Strickland, both of whom are managing directors of TMC,
are the portfolio managers for the Fund.  Mr. McMahon has managed municipal
bond portfolios for TMC since 1984, and Mr. Strickland has performed
municipal bond credit analysis and management since joining TMC in 1991.
Mr. McMahon and Mr. Strickland are assisted by other employees of TMC in
managing the Fund's portfolio.

Purchase of Fund Shares

The Fund offers multiple classes of shares.  Purchases of Class A and
Class C shares are described below.

Class A Shares

Class A Shares are sold subject to a sales charge deducted at the time you
purchase your shares:

                        Class A Shares Sales Charge
                    as a percentage     as a percentage
Purchase Amount     of Offering Price  of Net Asset Value
- ---------------     -----------------  ------------------
[S]                        [C]                [C]
Less than $249,999.99      2.00%              2.04%
$250,000 to 499,999.99     1.50%              1.52%
$500,000 to 999,999.99     1.25%              1.27%
$1,000,000 and up          0.00%              0.00%

   No sales charge will be payable at the time of purchase on investments of
   $1 million or more made by a purchaser.  A contingent deferred sales
   charge will be imposed on these investments in the event of a share
   redemption within one year following the share purchase at the rate of
   1/2 of 1% of the value of the shares redeemed.

Shareholders who sign a letter of intent to purchase more than $50,000 over
13 months may buy Class A shares at a reduced sales charge. Certain
shareholders may buy Class A shares at no sales charges, including the
following:

     1.  shareholders who purchase shares within 24 months of redeeming
         Class A shares;

     2.  customers of trust companies or bank trust departments;

     3.  customers of fee for service financial advisors;

     4.  shareholders investing through a dealer's wrap program;

     5.  shareholders whose orders are placed through certain brokers
         maintaining omnibus accounts.

Class C Shares

Class C shares are sold at net asset value, but are subject to higher
annual expenses and a .60% contingent deferred sales charge if redeemed
within one year of purchase.

The minimum purchase to open an account is $5,000.  Minimum additional
purchase for any account is $100.  Minimum account size is $1,000, and
accounts falling below that amount may be subject to mandatory redemption.
Purchases may be made by mail, through your financial advisor or by
telephone.

Redeeming Fund Shares

You can withdraw money from your Fund account on any Fund business day by
redeeming some or all of your shares (selling them back to the Fund either
directly or through your financial advisor).  Your shares will be purchased
by the Fund at the net asset value next computed after your order is
received in proper form.  If your purchase was subject to a contingent
deferred sales charge within one year of purchase, the charge will be
deducted. You may redeem Fund shares by mail, through your financial
advisor, or by telephone, if you have previously signed up for the
telephone redemption feature.

Distributions and Taxes

The Fund distributes substantially all of its net income and realized
capital gains to shareholders each year.  The Fund declares its net
investment income daily and distributes it monthly.  The Fund will
distribute any net realized capital gains at least annually.  Distributions
are reinvested automatically in additional shares unless you elect to
receive them in cash.  Income dividends attributable to tax exempt
municipal obligations owned by the Fund are exempt from federal personal
income tax, but some portion of these dividends could be subject to the
alternative minimum tax.  Dividends attributable to market discount on
portfolio securities and distributions of net short-term capital gains are
taxable as ordinary income.  Any distributions of long-term capital gains
are taxed as long-term capital gains for federal income tax purposes.
Income dividends may not be exempt from state income taxes or taxes imposed
on persons who are not individuals.

Other Fund Services

* Thornburg Funds telephone representatives:  Monday through Friday from
  7:30 a.m. to 4:30 p.m. Mountain Time, at 1-800-847-0200.

* Thornburg Funds Audio Response System: 24 hours a day, 7 days a week.
  Call 1-800-847-0200.

* The Automatic Investment Plan: transfer as little as $100 from your bank
  account on a weekly, monthly or quarterly basis.

* Exchange Class A shares of any other Thornburg Fund for Class A
  shares of the Fund without paying any additional sales charge.

* Website: Contact Thornburg on the Internet at www.Thornburg.com

Contact your financial advisor or the Fund for more information on these and
other services available to you.


Please call 1-800-847-0200 or your financial adviser for an application to
purchase shares of the Fund.  A copy of the Fund's prospectus will be sent
to you with the application.

                                  <LOGO>
                              Thornburg Funds
                          Investing With Integrity

               Thornburg Securities Corporation, Distributor
             119 East Marcy Street, Santa Fe, New Mexico 87501
                                 800-847-0200
            www.thornburg.com    e-mail: [email protected]



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