THORNBURG INVESTMENT TRUST
485APOS, 2000-10-13
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                                                                   33-14905

            Filed with the Securities and Exchange Commission
                           October 13, 2000

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                    FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933                  [x]
    Pre-Effective Amendment No.       [ ]
    Post-Effective Amendment No. 43   [x]

                          and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 [x]
    Amendment No. 46                  [x]

(Check appropriate box or boxes)

THORNBURG INVESTMENT TRUST (formerly "Thornburg Income Trust")
(Exact Name of Registrant as Specified in Charter)

119 East Marcy Street, Suite 202, Santa Fe, NM  87501
(Address of Principal Executive Offices)     (Zip Code)

Registrant's Telephone Number, including Area Code
(505) 984-0200

H. Garrett Thornburg, Jr.
119 East Marcy Street, Suite 202
Santa Fe, New Mexico  87501
(Name and Address of Agent for Service

Approximate Date of Proposed Public Offering December 27, 2000
                                             -----------------
It is proposed that this filing will become effective (check appropriate
box):

    [ ]  Immediately upon filing pursuant to paragraph (b)
    [ ]  On [date] pursuant to paragraph (b)
    [ ]  60 days after filing pursuant to paragraph (a)
    [ ]  On November 1, 2000 pursuant to paragraph (a)(1)
    [X]  75 days after filing pursuant to paragraph (a)(2)
    [ ]  On [date] pursuant to paragraph (a)(2) of Rule 485

If appropriate, check the following box:

[ ]  This post-effective amendment designates a new effective date
     for a previously filed post-effective amendment.

<PAGE>
                        THORNBURG INVESTMENT TRUST

    (i)    Thornburg Limited Term U.S. Government Fund
    (ii)   Thornburg Intermediate Municipal Fund
    (iii)  Thornburg New Mexico Intermediate Municipal Fund
    (iv)   Thornburg Limited Term Income Fund
    (v)    Thornburg Florida Intermediate Municipal Fund
    (vi)   Thornburg Value Fund
    (vii)  Thornburg Global Value Fund
    (viii) Thornburg New York Intermediate Municipal Fund
    (ix)   Thornburg Growth Fund

                                CONTENTS

Facing Sheet

Contents


Cross Reference Sheets    (Thornburg Intermediate Municipal Fund;
                          [Class A and Class C shares]
                          Thornburg New Mexico Intermediate Municipal Fund
                          [Class A shares and Class D shares];
                          Thornburg Florida Intermediate Municipal Fund
                          [Class A shares];
                          Thornburg New York Intermediate Municipal Fund
                          [Class A shares];
                          (Thornburg Limited Term U.S. Government Fund
                          [Class A shares and Class C shares];
                          Thornburg Limited Term Income Fund
                          [Class A shares and Class C shares])
                          Thornburg Value Fund [Class A shares, Class B
                          shares and
                          Class C shares]; Thornburg Global Value Fund
                          [Class A shares, Class B shares and Class C
                          shares]

Cross Reference Sheets    (Thornburg Intermediate Municipal Fund
                          [Institutional Class]; Thornburg Limited Term U.S.
                          Government Fund [Institutional Class]; Thornburg
                          Limited Term Income Fund [Institutional Class];
                          Thornburg Value Fund [Institutional Class])

Cross Reference Sheets    (Thornburg Growth Fund[Class A Shares and
                          Class C Shares])

Prospectus                (Thornburg Intermediate Municipal Fund;
                          [Class A and Class C shares]
                          Thornburg New Mexico Intermediate Municipal Fund
                          [Class A and Class D shares];
                          Thornburg Florida Intermediate Municipal Fund
                          [Class A shares];
                          Thornburg New York Intermediate Municipal Fund
                          [Class A shares])
                          (Thornburg Limited Term U.S. Government Fund
                          [Class A shares and Class C shares];
                          Thornburg Limited Term Income Fund
                          [Class A shares and Class C shares])
                          (Thornburg Value Fund [Class A shares, Class B
                          shares and
                          Class C shares]; Thornburg Global Value Fund
                          [Class A shares, Class B shares and Class C
                          shares])

Prospectus                (Thornburg Intermediate Municipal Fund
                          [Institutional Class shares];
                          Thornburg Limited Term U.S. Government Fund
                          [Institutional Class Shares];
                          Thornburg Limited Term Income Fund
                          [Institutional Class shares];
                          Thornburg Value Fund [Institutional Class shares])

Prospectus                (Thornburg Growth Fund [Class A shares and Class C
                          shares])

Statement of Additional   (Thornburg Limited Term U.S. Government Fund
Information               [Class A shares and Class C shares];
                          Thornburg Limited Term Income Fund
                          [Class A shares and Class C shares])
                          (Thornburg Intermediate Municipal Fund
                          [Class A shares and Class C shares];
                          Thornburg New Mexico Intermediate Municipal Fund
                          [Class A and Class D shares];
                          Thornburg Florida Intermediate Municipal Fund
                          [Class A shares];
                          Thornburg New York Intermediate Municipal Fund
                          [Class A shares])
                          (Thornburg Value Fund [Class A shares, Class B
                          shares and
                          Class C shares]; Thornburg Global Value Fund
                          [Class A shares, Class B shares and Class C
                          shares])

Statement of Additional
Information               (Thornburg Intermediate Municipal Fund
                          [Institutional Class shares];
                          Thornburg Limited Term U.S. Government Fund
                          [Institutional Class shares];
                          Thornburg Limited Term Income Fund
                          [Institutional Class shares]; and
                          Thornburg Value Fund
                          [Institutional Class shares])

Statement of Additional
Information               (Thornburg Growth Fund [Class A shares and Class C
                          shares])



Part C

Signature Page

Exhibits


<PAGE>

                     THORNBURG INVESTMENT TRUST
                       CROSS REFERENCE SHEETS
                         ("Thornburg Funds"
       [Class A Shares, Class B Shares, Class C Shares and
                         Class D Shares])
               Thornburg Intermediate Municipal Fund
         Thornburg New Mexico Intermediate Municipal Fund
          Thornburg Florida Intermediate Municipal Fund
          Thornburg New York Intermediate Municipal Fund
           Thornburg Limited Term U.S. Government Fund
                Thornburg Limited Term Income Fund
                       Thornburg Value Fund
                    Thornburg Global Value Fund


Form N-1A Item Number
---------------------
Part A                               Prospectus Caption
1(a). . . . . . . . . . . . . . . . . .Front Cover Page
 (b). . . . . . . . . . . . . . . . . . Back Cover Page
2(a). . . . . . . . . . . . . . . . . .Investment Goals
 (b). . . . . . . . . . . Principal Investment Strategy
 (c). . . . . . . . . .Principal Risks/Past Performance
3 . . . . . . . . . . . . . . . . . . Fees and Expenses
4 . . . . . . . . . . . Principal Investment Strategies
5 . . . . . . . . . . . . . . . . . . .(Annual Reports)
6(a) . . . . . . . . . . . . . . . . INVESTMENT ADVISER
 (b) . . . . . . . . . . . . . . . . . (Not Applicable)
7(a) . . . . . .OPENING AN ACCOUNT - BUYING FUND SHARES
 (b) . . . . . OPENING AN ACCOUNT - BUYING FUND SHARES;
                                           Buying Class
                       A Shares; Buying Class C Shares;
                                  Buying Class D Shares
 (c) . . . . . . . . . . . . . . . .SELLING FUND SHARES
 (d) . . . . . . . . . . . .DIVIDENDS AND DISTRIBUTIONS
 (e) . . . . . . . . . . . . . . . . . . . . . . .TAXES
 (f) . . . . . . . . . . . . . . . . . (Not Applicable)
8(a) . . . . . . . . . . . . . . . . BUYING FUND SHARES
 (b) . . . . . . . . .YOUR ACCOUNT - BUYING FUND SHARES
 (c) . . . . . . . . . . . . . . . . BUYING FUND SHARES
9 . . . . . . . . . . . . . . . . .FINANCIAL HIGHLIGHTS

Part B              Statement of Additional Information

10(a) . . . . . . . . . . . . . . . . .Front Cover Page
10(b) . . . . . . . . . . . . . . . . TABLE OF CONTENTS
11(a) . . . . . . . . . . . . ORGANIZATION OF THE FUNDS
  (b) . . . . . . . . . . . . . . . . .(Not Applicable)
12(a) . . . . . . . . . . . . ORGANIZATION OF THE FUNDS
  (b) . . . . . . . .INVESTMENT OBJECTIVES AND POLICIES
  (c) . . . . . . . INVESTMENT OBJECTIVES AND POLICIES;
                                 INVESTMENT LIMITATIONS
  (d) . . . . . . . . . . . . . . . . . . . .Prospectus
  (e) . . . . . . . . . . . . . .PORTFOLIO TRANSACTIONS
13(a) . . . . . . ORGANIZATION OF THE FUNDS; MANAGEMENT
  (b) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
  (c) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
  (d) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
14(a) . . . . . . . . . . . . . . . . .(Not Applicable)
  (b) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
  (c) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
15(a) . . . . . . . . . . . . . INVESTMENT ADVISORY AND
                     ADMINISTRATIVE SERVICES AGREEMENTS
  (b) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
  (c) . . . . . . . . . . . . . INVESTMENT ADVISORY AND
                     ADMINISTRATIVE SERVICES AGREEMENTS
  (d) . . . . . . . . . . . . . INVESTMENT ADVISORY AND
                     ADMINISTRATIVE SERVICES AGREEMENTS
  (e) . . . . . . . . . . . . . . . . .(Not Applicable)
  (f) . . . . . . . . . . . . . Prospectus; DISTRIBUTOR
  (g) . . . . . . . . . .SERVICE AND DISTRIBUTION PLANS
  (h) . . . . . . . . . . . . . . . . .(Not Applicable)
16(a) . . . . . . . . . . . . . .PORTFOLIO TRANSACTIONS
  (b) . . . . . . . . . . . . . . . . .(Not Applicable)
  (c) . . . . . . . . . . . . . .PORTFOLIO TRANSACTIONS
  (d) . . . . . . . . . . . . . . . . .(Not Applicable)
  (e) . . . . . . . . . . . . . . . . .(Not Applicable)
17(a) . . . . . . Prospectus; ORGANIZATION OF THE FUNDS
  (b) . . . . . . . . . . . . . . . . .(Not Applicable)
18(a) . . . . . . . Prospectus; PURCHASE OF FUND SHARES
  (b) . . . . . . . . . . . . . PURCHASE OF FUND SHARES
  (c) . . .Prospectus; DETERMINATION OF NET ASSET VALUE
  (d) . . . . . . . . . . . . . . . . . . . .Prospectus
19(a) . . DISTRIBUTIONS, TAXES AND SHAREHOLDER ACCOUNTS
  (b) . . DISTRIBUTIONS, TAXES AND SHAREHOLDER ACCOUNTS
20(a) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
  (b) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
  (C) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
21(a) . . . . . . . . . . . . . . . . .(Not Applicable)
  (b) . . . . . . . . . . YIELD AND RETURN COMPUTATION;
                 REPRESENTATIVE PERFORMANCE INFORMATION
22(a) . Financial Statements (incorporated by reference)
  (b) . Financial Statements (incorporated by reference)

<PAGE>
              THORNBURG INVESTMENT TRUST
                CROSS REFERENCE SHEETS
        Thornburg Intermediate Municipal Fund
                 [Institutional Class]
      Thornburg Limited Term U.S. Government Fund
                 [Institutional Class]
          Thornburg Limited Term Income Fund
                 [Institutional Class]
                 Thornburg Value Fund
                 [Institutional Class]

Form N-1A Item Number
---------------------
Part A                               Prospectus Caption
1(a). . . . . . . . . . . . . . . . . .Front Cover Page
 (b). . . . . . . . . . . . . . . . . . Back Cover Page
2(a). . . . . . . . . . . . . . . . . .Investment Goals
 (b). . . . . . . . . . . Principal Investment Strategy
 (c). . . . . . . . . .Principal Risks/Past Performance
3 . . . . . . . . . . . . . . . . . . Fees and Expenses
4 . . . . . . . . . . . Principal Investment Strategies
5 . . . . . . . . . . . . . . . . . . .(Annual Reports)
6(a) . . . . . . . . . . . . . . . . INVESTMENT ADVISER
 (b) . . . . . . . . . . . . . . . . . (Not Applicable)
7(a) . . . . . .OPENING AN ACCOUNT - BUYING FUND SHARES
 (b) . . . . . OPENING AN ACCOUNT - BUYING FUND SHARES;
                                           Buying Class
                       A Shares; Buying Class C Shares;
                                  Buying Class D Shares
 (c) . . . . . . . . . . . . . . . .SELLING FUND SHARES
 (d) . . . . . . . . . . . .DIVIDENDS AND DISTRIBUTIONS
 (e) . . . . . . . . . . . . . . . . . . . . . . .TAXES
 (f) . . . . . . . . . . . . . . . . . (Not Applicable)
8(a) . . . . . . . . . . . . . . . . BUYING FUND SHARES
 (b) . . . . . . . . .YOUR ACCOUNT - BUYING FUND SHARES
 (c) . . . . . . . . . . . . . . . . BUYING FUND SHARES
9 . . . . . . . . . . . . . . . . .FINANCIAL HIGHLIGHTS

Part B              Statement of Additional Information

10(a) . . . . . . . . . . . . . . . . .Front Cover Page
10(b) . . . . . . . . . . . . . . . . TABLE OF CONTENTS
11(a) . . . . . . . . . . . . ORGANIZATION OF THE FUNDS
  (b) . . . . . . . . . . . . . . . . .(Not Applicable)
12(a) . . . . . . . . . . . . ORGANIZATION OF THE FUNDS
  (b) . . . . . . . .INVESTMENT OBJECTIVES AND POLICIES
  (c) . . . . . . . INVESTMENT OBJECTIVES AND POLICIES;
                                 INVESTMENT LIMITATIONS
  (d) . . . . . . . . . . . . . . . . . . . .Prospectus
  (e) . . . . . . . . . . . . . .PORTFOLIO TRANSACTIONS
13(a) . . . . . . ORGANIZATION OF THE FUNDS; MANAGEMENT
  (b) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
  (c) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
  (d) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
14(a) . . . . . . . . . . . . . . . . .(Not Applicable)
  (b) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
  (c) . . . . . . .MANAGEMENT AND HOLDERS OF SECURITIES
15(a) . . . . . . . . . . . . . INVESTMENT ADVISORY AND
                     ADMINISTRATIVE SERVICES AGREEMENTS
  (b) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
  (c) . . . . . . . . . . . . . INVESTMENT ADVISORY AND
                     ADMINISTRATIVE SERVICES AGREEMENTS
  (d) . . . . . . . . . . . . . INVESTMENT ADVISORY AND
                     ADMINISTRATIVE SERVICES AGREEMENTS
  (e) . . . . . . . . . . . . . . . . .(Not Applicable)
  (f) . . . . . . . . . . . . . Prospectus; DISTRIBUTOR
  (g) . . . . . . . . . .SERVICE AND DISTRIBUTION PLANS
  (h) . . . . . . . . . . . . . . . . .(Not Applicable)
16(a) . . . . . . . . . . . . . .PORTFOLIO TRANSACTIONS
  (b) . . . . . . . . . . . . . . . . .(Not Applicable)
  (c) . . . . . . . . . . . . . .PORTFOLIO TRANSACTIONS
  (d) . . . . . . . . . . . . . . . . .(Not Applicable)
  (e) . . . . . . . . . . . . . . . . .(Not Applicable)
17(a) . . . . . . Prospectus; ORGANIZATION OF THE FUNDS
  (b) . . . . . . . . . . . . . . . . .(Not Applicable)
18(a) . . . . . . . Prospectus; PURCHASE OF FUND SHARES
  (b) . . . . . . . . . . . . . PURCHASE OF FUND SHARES
  (c) . . . . . . . . . . . . . . . . . . . .Prospectus
  (d) . . . . . . . . . . . . . . . . . . . .Prospectus
19(a) . . DISTRIBUTIONS, TAXES AND SHAREHOLDER ACCOUNTS
  (b) . . DISTRIBUTIONS, TAXES AND SHAREHOLDER ACCOUNTS
20(a) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
  (b) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
  (C) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
21(a) . . . . . . . . . . . . . . . . .(Not Applicable)
  (b) . . . . . . . . . . YIELD AND RETURN COMPUTATION;
                 REPRESENTATIVE PERFORMANCE INFORMATION
22(a) . Financial Statements (incorporated by reference)
  (b) . Financial Statements (incorporated by reference)

<PAGE>
              THORNBURG INVESTMENT TRUST
                CROSS REFERENCE SHEETS
              ("Thornburg Growth Fund")
          [Class A Shares and Class C Shares]
                Thornburg Growth Fund

Form N-1A Item Number
---------------------
Part A                               Prospectus Caption
1(a). . . . . . . . . . . . . . . . . .Front Cover Page
 (b). . . . . . . . . . . . . . . . . . Back Cover Page
2(a). . . . . . . . . . . . . . . . . .Investment Goals
 (b). . . . . . . . . . . Principal Investment Strategy
 (c). . . . . . . . . .Principal Risks/Past Performance
3 . . . . . . . . . . . . . . . . . . Fees and Expenses
4 . . . . . . . . . . . Principal Investment Strategies
5 . . . . . . . . . . . . . . . . . . .(Annual Reports)
6(a) . . . . . . . . . . . . . . . . INVESTMENT ADVISER
 (b) . . . . . . . . . . . . . . . . . (Not Applicable)
7(a) . . . . . .OPENING AN ACCOUNT - BUYING FUND SHARES
 (b) . . . . . OPENING AN ACCOUNT - BUYING FUND SHARES;
                                           Buying Class
                       A Shares; Buying Class C Shares;
                                  Buying Class D Shares
 (c) . . . . . . . . . . . . . . . .SELLING FUND SHARES
 (d) . . . . . . . . . . . .DIVIDENDS AND DISTRIBUTIONS
 (e) . . . . . . . . . . . . . . . . . . . . . . .TAXES
 (f) . . . . . . . . . . . . . . . . . (Not Applicable)
8(a) . . . . . . . . . . . . . . . . BUYING FUND SHARES
 (b) . . . . . . . . . . . . . . . . BUYING FUND SHARES
 (c) . . . . . . . . . . . . . . . . BUYING FUND SHARES
9 . . . . . . . . . . . . . . . . . . .(Not Applicable)

Part B              Statement of Additional Information

10(a) . . . . . . . . . . . . . . . . .Front Cover Page
10(b) . . . . . . . . . . . . . . . . TABLE OF CONTENTS
11(a) . . . . . . . . . . . . .ORGANIZATION OF THE FUND
  (b) . . . . . . . . . . . . . . . . .(Not Applicable)
12(a) . . . . . . . . . . . . .ORGANIZATION OF THE FUND
  (b) . . . . . . . .INVESTMENT OBJECTIVES AND POLICIES
  (c) . . . . . . . INVESTMENT OBJECTIVES AND POLICIES;
                                 INVESTMENT LIMITATIONS
  (d) . . . . . . . . . . . . . . . . . . . .Prospectus
  (e) . . . . . . . . . . . . . .PORTFOLIO TRANSACTIONS
13(a) . . . . . . ORGANIZATION OF THE FUNDS; MANAGEMENT
  (b) . . . . . . . . . . . . . . . . . . . .MANAGEMENT
  (c) . . . . . . . . . . . . . . . . . . . .MANAGEMENT
  (d) . . . . . . . . . . . . . . . . . . . .MANAGEMENT
14(a) . . . . . . . . . . . . . . . . .(Not Applicable)
  (b) . . . . . . . . . . . . . . . . . . . .MANAGEMENT
  (c) . . . . . . . . . . . . . . . . . . . .MANAGEMENT
15(a) . . . . . . . . . . . . . INVESTMENT ADVISORY AND
                     ADMINISTRATIVE SERVICES AGREEMENTS
  (b) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
  (c) . . . . . . . . . . . . . INVESTMENT ADVISORY AND
                     ADMINISTRATIVE SERVICES AGREEMENTS
  (d) . . . . . . . . . . . . . INVESTMENT ADVISORY AND
                     ADMINISTRATIVE SERVICES AGREEMENTS
  (e) . . . . . . . . . . . . . . . . .(Not Applicable)
  (f) . . . . . . . . . . . . . Prospectus; DISTRIBUTOR
  (g) . . . . . . . . . .SERVICE AND DISTRIBUTION PLANS
  (h) . . . . . . . . . . . . . . . . .(Not Applicable)
16(a) . . . . . . . . . . . . . .PORTFOLIO TRANSACTIONS
  (b) . . . . . . . . . . . . . . . . .(Not Applicable)
  (c) . . . . . . . . . . . . . .PORTFOLIO TRANSACTIONS
  (d) . . . . . . . . . . . . . . . . .(Not Applicable)
  (e) . . . . . . . . . . . . . . . . . (Not Applicable)
17(a) . . . . . . Prospectus; ORGANIZATION OF THE FUNDS
  (b) . . . . . . . . . . . . . . . . .(Not Applicable)
18(a) . . . . . . . Prospectus; PURCHASE OF FUND SHARES
  (b) . . . . . . . . . . . . . PURCHASE OF FUND SHARES
  (c) . . .Prospectus; DETERMINATION OF NET ASSET VALUE
  (d) . . . . . . . . . . . . . . . . . . . .Prospectus
19(a) . . DISTRIBUTIONS, TAXES AND SHAREHOLDER ACCOUNTS
  (b) . . DISTRIBUTIONS, TAXES AND SHAREHOLDER ACCOUNTS
20(a) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
  (b) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
  (C) . . . . . . . . . . . . . . . . . . . DISTRIBUTOR
21(a) . . . . . . . . . . . . . . . . .(Not Applicable)
  (b) . . . . . . . . . . YIELD AND RETURN COMPUTATION;
22(a) . . . . . . . . . . . . . . . . .(not applicable)
  (b) . . . . . . . . . . . . . . . . .(not applicable)

<OUTSIDE FRONT COVER>
THORNBURG GROWTH FUND
Prospectus                                  THORNBURG INVESTMENT MANAGEMENT
December 27, 2000                                   <LOGO>
































Thornburg Growth Fund
("Growth Fund")



Thornburg Growth Fund is a separate investment portfolio of Thornburg
Investment Trust.

These securities have not been approved or disapproved by the Securities
and Exchange Commission or any state securities commission nor has the
Securities and Exchange Commission or any state securities commission
passed upon the accuracy or adequacy of this Prospectus.  Any
representation to the contrary is a criminal offense.

Fund shares involve investment risks (including possible loss of
principal), and are not deposits or obligations of, or guaranteed or
endorsed by, and are not insured by, any bank, the Federal Deposit
Insurance Corporation, the Federal Reserve Board, or any government agency.



                                                       NOT FDIC INSURED
                                                       MAY LOSE VALUE
                                                       NO BANK GUARANTEE

<PAGE>
                              TABLE OF CONTENTS

2          Thornburg Growth Fund
              Investment Goals
              Principal Investment Strategies
              Principal Risks of Investing in the Fund
              Past Performance of the Fund
              Fees and Expenses

5          Additional Information About Fund Investments,
           Investment Practices and Risks

8          Potential Advantages of Investing in the Fund

8          Opening Your Account

8          Buying Fund Shares

12         Selling Fund Shares

14         Investor Services

16         Transaction Details

17         Dividends and Distributions

19         Taxes

20         Organization of the Fund

43         Investment Adviser




<PAGE>
Thornburg Growth Fund

Investment Goals
----------------

The Fund seeks long-term growth of capital by investing in equity securities
selected for their growth potential.  This goal is a fundamental policy of
the Fund and may be changed only with shareholder approval.

Principal Investment Strategies
------------------------------

Growth Fund expects to invest primarily in domestic equity securities
(primarily common stocks) selected for their growth potential.  However, the
Fund may own a variety of securities, including foreign equity and debt
securities, domestic debt securities, and options, futures and warrants
relating to equity securities.

The Fund's investment adviser, Thornburg Investment Management, Inc.
(Thornburg) intends to invest in companies that it believes can grow revenues
and profits faster than the growth rate of the economy. The Fund can invest
in companies of any size, from larger, well-established companies to smaller,
emerging growth companies.

Thornburg primarily uses individual company and industry analysis to make
investment decisions.  Among the specific factors considered by Thornburg in
identifying securities for inclusion in the Fund are:

 .  relative earnings growth potential      .  franchise value
 .  industry growth potential               .  price/earnings ratio
 .  industry leadership                     .  inconsistency of revenue
 .  management strength                        stream
 .  potential for favorable developments    .  price/cash flow ratio
 .  undervalued assets                      .  debt/capital ratio

The Fund typically makes equity investments in the following three types of
companies:

 .  Growth Industry Leaders are fast growing companies that appear to have
proprietary advantages in industry segments that are experiencing rapid
growth.  Stocks of these companies generally sell at premium valuations.

 .  Consistent Growth Companies. Stocks in this category generally sell at
premium valuations and tend to show steady revenue and earnings growth.

 .  Emerging Franchises are typically growing companies that in Thornburg's
opinion are in the process of establishing a leading position in a
significant product, service or market and which Thornburg expects will grow,
or continue to grow, at an above average rate.

Debt securities occasionally will be considered for investment when Thornburg
believes them to be more attractive than equity alternatives.  The Fund may
purchase debt securities of any maturity and of any quality.

Principal Investment Risks
-------------------------

It is possible to lose money on an investment in the Fund.  The value of the
Fund's investments varies from day to day, generally reflecting changes in
market conditions, political and economic news, interest rates, dividends,
industry and technological developments, and specific corporate developments.
The value of the Fund's investments can be reduced sharply by unsuccessful
investment strategies, changes in industry leadership, poor economic growth,
high interest rates, and market volatility which may lead to extended periods
of lower valuations of future expected earnings.  Principal foreign
investment risks are changes in currency exchange rates which may adversely
affect the Fund's investments, economic and political instability,
confiscation, inability to sell foreign investments, and reduced legal
protections for investments.  Debt securities owned by the Fund may decrease
in value because of interest rate increases, defaults, or downgrades by
rating agencies.  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
governmental agency.

Additional information about Fund investments, investment strategies, and
risks of investing in the Fund appears below beginning on page __ and in the
Statement of Additional Information.

Past Performance of the Fund
----------------------------

Growth Fund commenced investment operations on December 27, 2000.  Fund
performance results have not been provided because the Fund has not been in
existence for a full calendar year.

Fees and Expenses of the Fund
-----------------------------

The following tables describe the fees and expenses that 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          4.50%      none
     (as a percentage of offering price)

     Maximum Deferred Sales Charge (Load) on
       Redemptions                                     1.00*      1.00%**
     (as a percentage of redemption proceeds or
      original purchase price, whichever is lower)

 * Imposed only on redemptions of purchases greater than $1 million or
   greater 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                             .88%       .88%
     Distribution and Service (12b-1) Fees      .25%      1.00%
     Other Expenses                            1.94%      4.17%
                                               -----     ------
           Total Annual Operating Expenses     3.07%*     6.05%*

*Other expenses in the table are estimated for the current fiscal year,
before expense reimbursements.  Thornburg Investment Management, Inc. intends
to reimburse expenses so that actual Class A expenses are 1.63% and actual
Class C expenses are 2.38%.  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,
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
                       ------    -------
     Class A Shares     $746     $1,355
     Class C Shares      702      1,787

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

                       1 Year    3 Years
                       ------    -------
     Class C Shares     $602     $1,787

<PAGE>
ADDITIONAL INFORMATION ABOUT FUND INVESTMENTS, INVESTMENT PRACTICES, AND
RISKS

We describe below in greater detail certain types of securities and
investment practices that are referred to above in describing the Fund.  We
also describe below securities and investment practices which the Fund may
sometimes use, but which are not of principal importance to the Fund.  The
investment profile of the Fund will vary over time, depending on various
factors, and the Fund may not invest in all of the securities in its
permitted to purchase.  You will find more information on these subjects in
the Fund's Statement of Additional Information.

Equity Securities.
-----------------
The Fund invests in equity securities, which include common stocks, preferred
stocks, convertible securities, warrants, ADRs (American Depository Receipts
or EDR's), partnership interests and publicity traded real estate investment
trusts.  Common stocks, the most familiar type, represent an equity
(ownership) interest in a corporation.  Although equity securities have a
history of long-term growth in value, their prices fluctuate based on changes
in a company's financial condition and on overall market and economic
conditions.

Debt Securities.
---------------
The Fund may invest in debt securities.  Bonds and other debt instruments,
including convertible debt securities, are used by issuers to borrow money
from investors.  The issuer pays the investor a fixed or variable rate of
interest, and must repay the amount borrowed at maturity.  Some debt
securities, such as zero coupon bonds, do not pay current interest, but are
purchased at a discount from their face values.  Debt securities have varying
degrees of quality and varying levels of sensitivity to changing interest
rates.  Longer-term debt securities are generally more sensitive to interest
rate changes than short term debt securities.  Lower-quality debt securities
(sometimes called "junk bonds" or "high yield securities") are rated below
investment grade by the primary rating agencies, and are often considered to
be speculative.

U.S. Government Securities.
--------------------------
The Funds may invest in U.S. Government securities, although this is not a
principal investment strategy of the Fund.  U.S. Government Securities
include U.S. Treasury obligations such as U.S. Treasury Bills, U.S. Treasury
Notes, and U.S. Treasury Bonds, with various interest rates, maturities and
dates of issuance.  These U.S. Treasury Securities are direct obligations of
the U.S. Treasury, backed by the full faith and credit of the U.S.
Government.  U.S. Government securities also include "agency obligations."
Some agency obligations are backed by the full faith and credit of the U.S.
Government, but other agency obligations are supported by the agency's
authority to borrow from the U.S. Government or the discretionary authority
of the Treasury to purchase obligations of the issuing agency.

Foreign Securities.
------------------
The Fund may invest in foreign securities.  Foreign securities and foreign
currencies may involve additional risks.  Securities of foreign issuers, even
if denominated in U.S. dollars, may be affected significantly by fluctuations
in the value of foreign currencies, and the value of these securities in U.S.
dollars may decline even if the securities increase in value in their home
country.  Foreign securities also are subject to greater political risk,
including nationalization of assets, confiscatory taxation, currency exchange
controls, excessive or discriminatory regulations, and restrictions on
repatriation of assets and earnings to the United States.  In some countries,
there may be political instability or insufficient governmental supervision
of markets, and the legal protections for the Fund's investments could be
subject to unfavorable judicial or administrative changes.  Further,
governmental issuers may be unwilling or unable to repay principal and
interest when due, and may require that the terms for payment be
renegotiated.  Markets in some countries may be more volatile, and subject to
less stringent investor protection and disclosure requirements and it may be
difficult to sell securities in those markets.  Moreover, the economics in
many countries may be relatively unstable because of dependence on a few
industries or economic sectors.

Temporary Investments.
---------------------
The Fund may purchase short-term, highly liquid securities such as time
certificates of deposit, short-term U.S. Government securities, and
commercial paper.  The Fund typically holds these securities under normal
conditions pending investment of idle funds or to provide liquidity.  The
Fund also may hold assets in these securities for temporary defensive
conditions.  Investment in these securities for temporary periods could
reduce the Fund's ability to attain its investment objectives.

The Fund may invest in debt securities of any quality, including high yield
securities commonly known as "junk bonds."

Securities which are rated within the four highest ratings of a ratings
agency are considered "investment grade" securities.  These securities are
regarded by rating agencies as having a capacity to pay interest and repay
principal that varies from "extremely strong" to "adequate".  The lowest
ratings of the investment grade securities may have speculative
characteristics, and may be more vulnerable to adverse economic conditions or
changing circumstances.  Junk bonds involve greater risk of default or price
changes due to changes in the issuer's creditworthiness, or they may already
be in default.  The market prices of these securities may fluctuate more than
higher-quality securities and may decline significantly in periods of general
economic difficulty or in response to adverse publicity or changes in
investor perceptions.

Investments in Small Companies.
------------------------------
The Fund may invest in the stock or debt securities of smaller or unseasoned
issuers.  Although investments in these companies may offer greater prospects
for appreciation, they involve additional risks because of limited product
lines, limited access to markets and financial resources, and greater
vulnerability to competition and changes in markets.  Additionally, the value
of these securities may fluctuate more, and they may be more difficult to
sell, particularly in declining markets.

Investments in Other Investment Companies.
-----------------------------------------
The Fund may invest in securities of closed end investment companies,
although this is not a principal strategy of the Fund.  Up to 5% of its total
assets at the time of purchase may be invested in any one investment company,
provided that after its purchase no more than 3% of that investment company's
outstanding stock is owned by the Fund, and provided further, that no more
than 10% of the Fund's total assets are invested in investment companies.
Thornburg will charge an advisory fee on the portion of the Fund's assets
that are invested in securities of other investment companies.  Thus
shareholders will be paying a "double fee" on those assets since the advisers
of the investment companies also will be charging fees on the same assets.

Adjusting Investment Exposure.
-----------------------------
The Fund may use various techniques to increase or decrease its exposure to
changing securities prices, interest rates, currency exchange rates,
commodity prices, or other factors that affect securities values.  These
techniques may involve derivative transactions such as buying and selling
options and futures contracts, entering into currency exchange contracts or
swap agreements, and purchasing indexed securities.  The Fund may sell
securities short.  Thornburg can use these practices to adjust the risk and
return characteristics of the Fund's portfolio of investments.  If Thornburg
judges market conditions incorrectly or employs a strategy that does not
correlate well with the Fund's investments, these techniques could result in
a loss, regardless of whether the intent was to reduce risk or increase
return.  These techniques may increase the price volatility of the Fund and
may involve a small investment of cash relative to the magnitude of the risk
assumed.  In addition, these techniques could result in a loss if the
counter-party to the transaction does not perform as promised.

Illiquid and Restricted Securities.
----------------------------------
Some investments may be determined by Thornburg, under the supervision of the
Trustees, to be illiquid, which means that they may be difficult to sell
promptly at an acceptable price.  The sale of other securities, including
illiquid securities, may be subject to legal restrictions.  Difficulty in
selling securities may result in a loss or may be costly to the Fund.

Borrowing.
---------
The Fund may borrow from banks or through reverse repurchase agreements.  If
the Fund borrows money, its share price may be subject to greater fluctuation
until the borrowing is paid off.  If the Fund makes additional investments
while borrowings are outstanding, this may be considered a form of leverage.

Portfolio Turnover
------------------

The Fund anticipates that its annual turnover rate normally will be less than
100%.  A 100% turnover rate would occur, for example, if all of the
securities held by the Fund were sold and replaced within one year.
Thornburg does not consider the portfolio turnover rate a limiting factor in
making investment decisions for a Fund which are otherwise consistent with
the Fund's investment objectives and management policies.  A higher rate of
turnover, may, however, result in increased transaction costs and taxable
capital gains.

POTENTIAL ADVANTAGES OF INVESTING IN THE FUND

Investing through a mutual fund permits smaller investors to diversify an
investment among a larger number of securities.  Investment in a mutual fund
also relieves the investor of many investment management and administrative
burdens usually associated with the direct purchase and sale of securities,
otherwise consistent with that fund's investment objectives and management
policies.  These include: (i) selection of portfolio investments; (ii)
surveying the market for the best price at which to buy and sell; (iii)
valuation of portfolio securities; (iv) selecting and scheduling of
maturities and reinvestments; (v) receipt, delivery and safekeeping of
securities; and (vi) portfolio recordkeeping.

OPENING AN ACCOUNT

Complete and sign an account application and give it, along with your check,
to your financial advisor.  You may also open your account by mail, by
sending your application with your check payable to the Fund.  You may, if
there is no application accompanying this Prospectus, call 1-800-847-0200.

The minimum amount to open an account is $5,000, except that an individual
retirement account may be opened with $2,000.  The minimum amount to add to
an account is $100.  You also may exchange from one Thornburg Fund into
another Thornburg Fund.  See "Investor Services," below.

You may add to an existing account by mail, wire, or through your financial
advisor.  Add to your account by mailing a check payable to your Fund, and be
sure to note your account number on the check.  If you wish to add to an
account by wire, telephone 1-800-847-0200 for wiring instructions.  Add to an
account through your financial advisor by telephoning your advisor.

You also may add to an account through the Automatic Investment Program.  See
"Investor Services," below, or telephone us at 1-800-847-0200 for details.

THE FUND OFFERS DIFFERENT CLASS OF SHARES

The Fund currently offers Class A and Class C shares.  Each of a Fund's
shares represents an equal undivided interest in the Fund's assets, and the
Fund has common investment objectives and a common investment portfolio.
Each class may have varying annual expenses and sales charge structures,
which may affect performance.  If you do not specify a class of shares in
your order, your money will be invested in Class A shares of the Fund.

Financial advisors and others who sell shares of the Fund receive different
compensation for selling different classes of the Fund's shares. Shares of
the Funds may be purchased through investment dealers, brokers or agents
"financial advisors") who have  agreements with the Funds' distributor,
Thornburg Securities Corporation (TSC), or through TSC in those states where
TSC is registered.  All orders are subject to acceptance by the Fund, and the
Fund and TSC reserve the right to refuse any order in whole or in part.

The Fund also may issue one or more other classes of shares not offered
through this Prospectus.  Different classes may have different sales charges
and other expenses which may affect performance.  Investors may telephone the
Fund's distributor, TSC, at (800) 847-0200 to obtain more information
concerning the various classes of shares which may be available to them
through their sales representatives.  Investors may also obtain information
respecting the different classes of shares through their sales representative
or other person who is offering or making available shares of the Fund.

NET ASSET VALUE

When you purchase shares, the price is based on the net asset value (NAV)
next determined after receipt of your order.  The net asset value is the
value of a share, and is computed for each class of the Fund by adding the
market value of investments, cash and other assets for the class, subtracting
liabilities, and then dividing by the number of shares outstanding.  Share
price is normally calculated at 4:00 p.m. Eastern time on each day the New
York Stock Exchange is open for business.

BUYING CLASS A SHARES

Class A shares are sold subject to a front-end sales charge.  The sales
charge is deducted from the offering price when you purchase shares, and the
balance is invested at net asset value (NAV).  The sales charge is not
imposed on shares that are purchased with reinvested dividends or other
distributions.  Class A shares are also subject to a Rule 12b-1 Service Plan,
which provides for the Fund's payment to Thornburg of up to 1/4 of 1% of the
class's net assets each year, to obtain various shareholder related services.
Because this service fee is paid out of the class's assets on an ongoing
basis, over time these fees will increase the cost of your investment and may
cost more than paying other types of sales charges.

Because the fees for Class A shares of the Fund are lower than the fees for
Class C shares of the Fund, Class A shares of the Fund pay higher dividends
than Class C shares of the same Fund. The deduction of the initial sales
charge, however, means that you purchase fewer Class A shares than Class C
shares of the Fund for a given amount invested.

If you are in any of the special classes of investors who can buy Class A
shares at net asset value or at a reduced sales charge, you should consider
buying Class A shares. If you are planning a large purchase or purchases
under the Right of Accumulation or Letter  of Intent you should consider if
your overall costs will be lower by buying Class A shares, particularly if
you plan to hold your shares for an extended period of time.

<TABLE>

                                             Class A Shares
                                           Total Sales Charge
                                    As Percentage         As Percentage
                                  of Offering Price       of Net Asset
<S>                               <C>                     <C>
Growth Fund
----------------------
Less than $50,000                  4.50%                  4.71%
$50,000 to 99,999.99               4.00%                  4.17%
$100,000 to 249,999.99             3.50%                  3.63%
$250,000 to $499,999.99            3.00%                  3.09%
$500,000 to 999,999.99             2.00%                  2.04%
%1,000,000 and over                0.00%                  0.00%*

</TABLE>


   *  A 1% CDSC is imposed on any portion of such purchases which are
      redeemed within one year.  TSC or Thornburg intend to pay a
      commission of 1% to financial advisors who place orders from $1
      million to $2 million, a commission of .7% for portions of any such
      trade exceeding $2 million and less than $4 million, and a commission
      of .5% for portions of any such trade exceeding $4 million.

      At certain times, for specific periods, TSC may reallow up to the
      full sales charge to all dealers who sell Fund shares.  These "full
      reallowances" may be based upon the dealer reaching specified minimum
      sales goals.  TSC will reallow the full sales charge only after
      notifying all dealers who sell Fund shares.  During such periods,
      dealers may be considered underwriters under securities laws.
      Thornburg or TSC also may pay additional cash or non-cash
      compensation to dealer firms which have selling agreements with TSC.
      Those firms may pay additional compensation to financial advisors who
      sell Fund shares. Non-cash compensation may include travel and
      lodging in connection with seminars or other educational programs.

LETTERS OF INTENT.  If you intend to invest, over the course of 13 or fewer
months, an amount of money that would qualify for a reduced sales charge if
it were made in one investment, you can qualify for the reduced sales charge
on the entire amount of your investment by signing a "Letter of Intent"
(LOI). Each investment you make during the 13 months will be charged the
reduced sales commission applicable to the amount stated in your LOI. You do
not have to reach the goal you set. If  you don't, you will have to pay the
difference between the sales charge you would have paid and the sales charge
you did pay. You may pay this amount directly to TSC, or TSC will redeem a
sufficient number of your shares in the Fund to obtain the difference.

RIGHTS OF ACCUMULATION. Each time the value of your account plus the amount
of any new investment passes one of the breakpoints illustrated in the table
below, the amount of your new investment in excess of the breakpoint
will be charged the reduced sales charge applicable to that range.

SALES CHARGE WAIVERS. You may purchase Class A shares of the Fund with no
sales charge if you notify TSC or the Fund's transfer agent, NFDS, at the
time you purchase shares that you belong to one of the categories below. If
you do not provide such notification at the time of purchase, your purchase
will not qualify for the waiver of sales charge.

 A SHAREHOLDER WHO REDEEMED CLASS A SHARES OF THE FUND. For two years after
 such a redemption you will pay no sales charge on  amounts  that you
 reinvest in Class A shares of the Fund, up to the amount you previously
 redeemed.

 AN OFFICER, TRUSTEE, DIRECTOR, OR EMPLOYEE OF THORNBURG (or any investment
 company managed by THORNBURG), TSC, any affiliated Thornburg Company, the
 Fund's Custodian bank or Transfer Agent and members of their families
 including trusts established for the benefit of the foregoing.

 EMPLOYEES OF BROKERAGE FIRMS who are members in good standing with the
 National Association of Securities Dealers, Inc. (NASD); employees of
 financial planning firms who p lace orders for the Fund through a member
 in good standing with NASD; the families of both types of employees.
 Orders must be placed through an NASD member firm who has signed an
 agreement with TSC to sell Fund shares.

 CUSTOMERS of bank trust departments, companies with trust powers,
 investment broker dealers and investment advisors who charge fees for
 service, including investment broker dealers who utilize wrap fee or
 similar arrangements.  Accounts established through these persons are
 subject to conditions, fees and restrictions imposed by these persons.

 INVESTORS PURCHASING $1 MILLION OR MORE. However, a contingent deferred
 sales charge of 1% applies to shares redeemed within one year of purchase.

 THOSE PERSONS WHO ARE DETERMINED BY THE TRUSTEES OF THE FUND to have
 acquired their shares under special circumstances not involving any sales
 expenses to the Fund or Distributor.

 PURCHASES PLACED THROUGH A BROKER THAT MAINTAINS ONE OR MORE OMNIBUS
 ACCOUNTS WITH THE FUND provided that such purchases are made by: (i)
 investment advisors or financial planners who place trades for their own
 accounts or the accounts of their clients and who charge a  management,
 consulting or other fee for their services; (ii) clients of such
 investment advisors or financial planners who place trades for their own
 accounts if the accounts are linked to  the master account of such
 investment advisor or financial planner on the books  and records of the
 broker or agent; and iii) retirement and deferred compensation plans and
 trusts used to fund those plans, including, but not  limited to, those
 defined in Sections 401(a), 403(b) or 457 of the Internal Revenue Code and
 "rabbi trusts." Investors may be charged a fee if they effect
 transactions in Fund shares through a broker or agent.

 PROCEEDS FROM A LOAD FUND REDEMPTION. You may purchase shares of the Fund
 at net asset value without a sales charge to the extent that the purchase
 represents proceeds from a redemption (within the previous 60 days) of
 shares of another mutual fund which  has a sales charge. When making a
 direct purchase at net asset value under this provision, the Fund must
 receive one of the  following with your  direct purchase order:  (i) the
 redemption check representing the proceeds of the shares redeemed,
 endorsed to the order of the  Fund, or (ii) a copy of the confirmation
 from the other fund, showing the redemption transaction. Standard back
 office procedures should be followed for  wire order purchases made
 through broker dealers. Purchases with redemptions from money market funds
 are not eligible for this privilege.  This provision may  be terminated
 anytime by TSC or the Fund without notice.

BUYING CLASS C SHARES.  Class C shares are sold at the NAV next determined
after your order is received.  Class C shares are subject to a 1% contingent
deferred sales charge (CDSC) if the shares are redeemed within one year of
purchase. The percentage is calculated on the amount of the redemption
proceeds for each share, or the original purchase price, whichever is lower.
Shares not subject to the CDSC are considered redeemed first.  The CDSC is
not imposed on shares purchased with reinvested dividends or other
distributions.  Class C shares are subject to a Rule 12b-1 Service Plan
providing for payment of a service fee of up to 1/4 of 1% of the class's net
assets each year, to obtain shareholder related services.  Class C shares are
also subject to a Rule 12b-1 Distribution Plan providing for payment of a
distribution fee of up to 3/4 of 1% of the class's net assets each year, to
pay for the sale and distribution of the Fund's shares and to pay for
commissions and other distribution expenses.  Because these service and
distribution fees are paid out of the class's assets on an ongoing basis,
over time these fees will increase the cost of your investment and may cost
more than paying other types of sales charges.  Purchases of $1,000,000 or
more of Class C shares will not be accepted.

If your investment horizon is relatively short and you do not qualify to
purchase Class A shares at a reduced sales charge, you should consider
purchasing Class C shares.

SELLING FUND SHARES

You can withdraw money from your Fund account at any time by redeeming some
or all of your shares (by selling them back to the Fund or by selling the
shares through you r financial advisor). Your shares will be redeemed by the
Fund at the next share price (NAV) calculated after your order is received in
proper form. The amount of the CDSC, if any, will be deducted and the
remaining proceeds sent to you. No CDSC is imposed on the amount by which the
value of a share may have appreciated. Similarly, no CDSC is imposed on
shares obtained through reinvestment of dividends or capital gains. Shares
not subject to a CDSC will be redeemed first. Share price is normally
calculated at 4 p.m. Eastern time.

*   Your Fund may hold payment on redemptions until it is reasonably
    satisfied that investments previously made by check have been
    collected, which can take up to 15 business days.

*   Payment for shares redeemed normally will be made by mail the next
    business day, and in most cases within seven days, after receipt by the
    Transfer Agent of a properly executed request for redemption
    accompanied by any outstanding certificates in proper form for
    transfer.  The Funds may suspend the right of redemption and may
    postpone payment when the New York Stock Exchange is closed for other
    than weekends or holidays, or if permitted by rules of the Securities
    and Exchange Commission during an emergency which makes it impractical
    for the Funds to dispose of their securities or fairly to determine net
    asset value, or during any other period specified by the Securities and
    Exchange Commission in a rule or order for the protection of investors.

*   No interest is accrued or paid on amounts represented by uncashed
    distribution or redemption checks.

If you are selling some but not all of your shares, leave at least $1,000
worth of shares in the account to keep it open.  The Fund reserves the right
to redeem the shares of any shareholder whose shares have a net asset value
of less than $1,000.  The Fund will notify the shareholder before performing
the redemption.

To redeem shares in an account, you may use any of the following methods.

Written Instructions
-------------------

Mail your instructions to the transfer agent at the address shown on the back
cover page.  Instructions must include the following information:

   .  Your name
   .  The Fund's name
   .  Fund Account number
   .  Dollar amount or number of shares to be redeemed
   .  Signature guarantee, if required (see below for instructions)
   .  Signature (see below for signature instructions)

Signature Requirements.

     Individual, Joint Tenants, Tenants in Common, Sole Proprietor General
     Partner Instructions must be signed by all persons required to sign
     for transactions, exactly as their names appear on the account.

     UGMA or UTMA.  Instructions must be signed by the custodian exactly as
     it appears on the account.

     Trust.  Instructions must be signed by trustee, showing trustee's
     capacity.  If trustee's name is not an account registration, provide a
     copy of trust document certified within the last 60 days.

     Corporation, Association.  Instructions must be signed by person
     authorized to sign on account.  A signature guarantee is required.
     Please include a copy of corporate resolution authorizing the signer
     to act.

     IRA or Retirement Account.  See IRA instructions or telephone
     1-800-847-0200.

     Executor, Administrator, Conservator, Guardian.  Telephone
     1-800-847-0200.

Telephone Redemption
-------------------

If you completed the telephone redemption section of your application when
you first purchased your shares, you may redeem by telephoning your Fund
Customer Representative at 1-800-847-0200.  Money may be wired to your bank
account designated on your account application or sent to you in a check.
The Funds' transfer agency may charge a wire fee, which will be deducted from
the amount wired.  If you did not complete the telephone redemption section
of your account application you may add this feature to your account.  The
minimum wire redemption is $1,000, and the minimum check redemption is
$50.00.  See "Investor Services," below, or telephone 1-800-847-0200.


Redeem Through Financial Adviser
-------------------------------

Consult with your financial advisor.  Your financial adviser may charge a
fee.

Internet Redemption
-------------------

You may redeem shares of any Fund by contacting Thornburg at its Website,
www.thornburg.com, and following the instructions.

Systematic Withdrawal Plan
-------------------------

Systematic withdrawal plans let you set up periodic redemptions from your
account.  Because of the sales charge on Class A shares of the Fund, you may
not want to set up a systematic withdrawal plan during a period when you are
buying Class A shares of the Fund on a regular basis. Minimum account size
for this feature is $10,000, and the minimum payment is $50.00.  Please
telephone your Fund Customer Representative at 1-800-847-0200.

CERTAIN REQUESTS MUST INCLUDE A SIGNATURE GUARANTEE. It is designed to
protect you and your Fund from fraud. Your request must be made in writing
and include a signature guarantee if any of the following situations apply:

 * You wish to redeem more than $25,000 worth of shares,
 * Your account registration has changed within the last 30 days,
 * The check is being mailed to a different address than the one on your
   account (record address),
 * The check is being made payable to someone other than the account owner,
 * The redemption proceeds are being transferred to a Thornburg account
   with a different registration, or
 * The redemption proceeds are otherwise being transferred differently than
   your account record authorizes.

You should be able to obtain a signature guarantee from a bank, broker
dealer, credit union (if authorized under state law), securities exchange or
association, clearing agency, savings association or participant in the
Securities Transfer Agent Medallion Program (STAMP). A notary public cannot
provide a signature guarantee.

INVESTOR SERVICES

Fund Information
----------------

Thornburg's telephone representatives are available Monday through Friday
from 9:30 a.m. to 6:30 p.m. Eastern time.  Whenever you call, you can speak
with someone equipped to provide the information or service you need.

Statements and reports sent to you include the following:

   .  Account statements after every transaction affecting your account.
   .  Quarterly account statements.
   .  Financial reports (every six months).

Thornburg's Website on the Internet provides you with helpful information 24
hours a day, at www.thornburg.com.

Automatic Investment Plan
-------------------------

One easy way to pursue your financial goals is to invest money regularly.
While regular investment plans do not guarantee a profit and will not protect
you against loss in a declining market, they can be an excellent way to
invest for retirement, a home, educational expenses, and other long-term
financial goals.  Certain restrictions apply for retirement accounts.  Call
800-847-0200 and speak to a Fund Customer Service Representative for more
information.

Exchanging Shares
-----------------

As a shareholder, you have the privilege of exchanging Class A shares of the
Fund for Class A shares of other Thornburg Funds.  However, you should note
the following:

   .  The Fund you are exchanging into must be registered for sale in your
      state.
   .  You may only exchange between accounts that are registered in the
      same name address, and taxpayer identification number.
   .  Before exchanging into a Fund, obtain and read the prospectus.
   .  Exchanges may have tax consequences for you.
   .  Because excessive trading can hurt fund performance and shareholders,
      the Fund reserves the right to temporarily or permanently terminate
      the exchange privilege of any investor who makes more than four
      exchanges out of a Fund in any calendar year.  Accounts under common
      ownership or control, including accounts with the same taxpayer
      identification number, will be counted together for purposes of the
      four exchange limit.
   .  The Fund reserves the right to refuse exchange purchases by any
      person or group if, in Thornburg's judgment, the Fund would be unable
      to invest the money effectively in accordance with its investment
      objective and policies, or would otherwise potentially be adversely
      affected.
   .  Your exchanges may be restricted or refused if a Fund receives or
      anticipates simultaneous orders affecting significant portions of the
      Fund's assets.  In particular, a pattern of exchanges that coincide
      with a "market timing" strategy may be disruptive to a Fund.

Although a Fund will attempt to give prior notice whenever it is reasonably
able to do so, it may impose these restrictions at any time.  The Thornburg
Funds reserve the right to terminate or modify the exchange privilege in the
future.

Telephone Redemption
--------------------

If you completed the telephone redemption section of your application when
you first purchased your shares, you may easily redeem any class of shares by
telephone simply by calling a Fund Customer Service Representative.

If you did not complete the telephone redemption section of your application,
you may add this feature to your account by calling the Fund for a telephone
redemption application.  Once you receive it, please fill it out, have it
signature guaranteed and send it to the address shown in the application.

The Fund, TSC, Thornburg and the Fund's Transfer Agent are not responsible
for, and will not be liable for, the authenticity of withdrawal instructions
received by telephone or the delivery or transmittal of the redemption
proceeds if they follow instructions communicated by telephone that they
reasonably believe to be genuine.  By electing telephone redemption you are
giving up a measure of security you otherwise may have by redeeming shares
only with written instructions, and you may bear the risk of any losses
resulting from telephone redemption.  The Fund's Transfer Agent will attempt
to implement reasonable procedures to prevent unauthorized transactions and
the Fund or its Transfer Agent could be liable if these procedures are not
employed.  These procedures will include recording of telephone transactions,
providing written confirmation of such transactions within 5 days, and
requesting certain information to better confirm the identity of the caller
at the time of the transaction.  You should verify the accuracy of your
confirmation statements immediately after you receive them.

Street Name Accounts
--------------------

Some broker dealers and other financial services firms offer to act as owner
of record of Fund shares as a convenience to investors who are clients of
those firms.  Neither the Fund nor its Transfer Agent can be responsible for
failures or delays in crediting shareholders for dividends or redemption
proceeds, or for delays in reports to shareholders if a shareholder elects to
hold Fund shares in street-name through an account with a financial firm
rather than directly in the shareholder's own name.  Further, neither the
Fund nor its Transfer Agent will be responsible to the investor for any loss
to the investor due to the failure of a financial firm, its loss of property
or funds, or its acts or omissions.  Prospective investors are urged to
confer with their financial advisors to learn about the different options
available for owning mutual funds shares.  You may receive share certificates
or hold shares in your name with the Transfer Agent upon request.

TRANSACTION DETAILS

The Fund is open for business each day the New York Stock Exchange (NYSE) is
open.  The Fund normally calculates its net asset value for each class of
shares as of the close of business of the NYSE, normally 4 p.m. Eastern time.
 Bonds and other fixed income securities are valued primarily using prices
obtained from independent pricing services.  Equity securities such as common
stocks are valued primarily on the basis of market quotations.  Foreign
securities are valued on the basis of quotations from the primary market in
which they are traded, and are translated from the local currency into U.S.
dollars using current exchange rates.  If quotations are not readily
available assets are valued by a method that the Trustees believe accurately
reflects fair value.

When you sign your account application, you will be asked to certify that
your Social Security or taxpayer identification number is correct and that
you are not subject to 31% backup withholding for failing to report income to
the IRS.  If you violate IRS regulations, the IRS can require your Fund to
withhold 31% of your taxable distributions and redemptions.

The Fund reserves the right to suspend the offering of shares for a period of
time.  The Fund also reserves the right to reject any specific purchase
order, including certain purchases by exchange.  See "Exchanging Shares"
above.  Purchase orders may be refused if, in Thornburg's opinion, they would
disrupt management of the Fund.

If you open or add to your account yourself rather than through your
financial advisor please note the following:

   .  All of your purchases must be made in U.S. dollars and checks must be
      drawn on U.S. banks.
   .  The Fund does not accept cash.
   .  If your check does not clear, your purchase will be cancelled and you
      could be liable for any losses or fees the Fund or its Transfer Agent
      has incurred.

When you buy shares of the Fund or sell them through your financial advisor
you may be charged a fee for this service.  Please read your financial
advisor's program materials for any additional procedures, service features
or fees that may apply.

Certain financial institutions which have entered into sales agreements with
TSC may enter confirmed purchase orders on behalf of customers by phone, with
payments to follow no later than the time when the Fund is priced on the
following business day.  If payment is not received by that time, the
financial institution could be held liable for resulting fees or losses.

The Fund may authorize certain securities brokers to receive on its behalf
purchase and redemption orders received in good form, and some of those
brokers may be authorized to designate other intermediaries to receive
purchase and redemption orders on the Fund's behalf.  Provided the order is
promptly transmitted to the Fund, the Fund will be deemed to have received a
purchase or redemption order at the time it is accepted by such an authorized
broker or its designee, and customer orders will be priced based upon the
Fund's net asset value next computed after the order is received by the
authorized broker or its designee.

<PAGE>
DIVIDENDS AND DISTRIBUTIONS

The Fund distributes substantially all of its net income and realized
capital gains, if any, to  shareholders each year. The Fund distributes any
net investment income quarterly.  The Fund will distribute net realized
capital gains, if any, at least annually. Capital gain distributions normally
will be declared and payable in December.

Distribution Options
The Fund may earn interest from bond, money market, and other investments.
These are passed along as dividend distributions. The Fund realizes capital
gains whenever it sells securities for a higher price than it paid for them.
 These are passed along as capital gain distributions. When you open an
account, specify on your application how you want to receive your
distributions. The Fund offers four options, (which you can change at any
time).

Dividends
1. Reinvestment Option. Your dividend distributions will be automatically
   invested in additional shares of your Fund at the next determined net
   asset value. If you do not indicate a choice on your application, you
   will be assigned this option. You may also instruct the Fund to invest
   your dividends in the shares of any other Thornburg Fund.

2. Cash Option. You will be sent a check for your dividend distributions.
   Cash distribution checks are normally mailed on the third business day
   after the month-end.

Capital Gains
1. Reinvestment Option. Your capital gain distributions, if any, will be
   automatically reinvested in additional shares of the Fund at the next
   determined net asset value. If you do not indicate a choice on your
   application, you will be assigned this option.  You may also instruct
   the Fund to re invest your capital gain distributions in shares of any
   other Thornburg Fund.

2. Cash Option. You will be sent a check for any capital gain
   distributions.

Shares of any Thornburg Fund purchased through reinvestment of dividend and
capital gain distributions are not subject to sales charges or contingent
deferred sales charges.  No interest is accrued or paid on amounts
represented by uncashed distribution checks.

Turnover and Capital Gains

The Fund does not intend to engage in short-term trading for profits.
Nevertheless, when a Fund believes that a security will no longer contribute
towards its reaching its goal, it will normally sell that security.

When the Fund sells a security at a profit it realizes a capital gain. When
it sells a security at a loss it realizes a capital loss.  A fund must, by
law, distribute capital gains, net of any losses, to its shareholders.
Whether you reinvest your capital gain distributions or take them in cash,
the distribution is taxable.

To minimize taxable capital gain distributions, the Fund will realize
capital losses, if available, when, in the judgment of the portfolio manager,
the integrity and income generating aspects of the portfolio would be
unaffected by doing so.

TAXES
Federal Taxes - In General

Certain general aspects of federal income taxation of individual shareholders
are discussed below.  Aspects of investment by shareholders who are not
individuals are addressed in a more limited manner.  Prospective investors, and
in particular persons who are not individuals, should consult their own tax
advisers concerning federal, state and local tax consequences respecting
investments in the Funds.

Federal Tax Treatment of Distributions

Distributions to shareholders representing net investment income and net short
term capital gains will be taxable to the recipient shareholders as ordinary
income, whether the distributions are actually taken in cash or are reinvested
in additional shares.  Fund distributions will not be eligible for the
dividends received deduction for corporations.  Distributions of net long-term
capital gains, if any, will be treated as long-term capital gains by
shareholders regardless of the length of time the shareholder has owned the
shares, and whether received as cash or in additional shares.

Federal Tax Treatment of Sales or Redemptions of Shares

Redemption or resale of shares by a shareholder will be a taxable transaction
for federal income tax purposes, and the shareholder will recognize gain or
loss in an amount equal to the difference between the shareholder's basis in
the shares and the amount received on the redemption or resale.  If the shares
sold or redeemed are a capital asset, the gain or loss will be a capital gain
or loss and will be long-term if the shares were held for more than one year.

State Taxes

With respect to distributions of interest income and capital gains from the
Fund, the laws of the several states and local taxing authorities vary with
respect to the taxation of such distributions, and shareholders of the Funds
are advised to consult their own tax advisers in that regard.

ORGANIZATION OF THE FUND

Growth Fund is a diversified series of Thornburg Investment Trust, a
Massachusetts business trust (the "Trust") organized as a diversified, open-end
management investment company under a Declaration of Trust (the "Declaration").
The Trust currently has eight other active series, each with a separate
investment portfolio.  The Trustees are authorized to divide the Trust's shares
into additional series and classes.

INVESTMENT ADVISER

The Fund is managed by Thornburg Investment Management, Inc. (Thornburg).
Thornburg performs investment management services for the Fund under the terms
of an Investment Advisory Agreement which specifies that Thornburg will select
investments for the Fund, monitor those investments and the markets generally,
and perform related services.  Thornburg also performs administrative services
applicable to each class under an Administrative Services Agreement which
requires that Thornburg will supervise, administer and perform certain
administrative services necessary for the maintenance of the class
shareholders. Thornburg 's services to the Fund and the Fund is supervised by
the Trustees of Thornburg Investment Trust.

The annual investment advisory and administrative services fee rates of the
Fund are .875% and .125%, respectively.

The advisory fee rate for the Fund decreases as assets increase, as described
in the Statement of Additional Information.

______________, a Managing Director of Thornburg, is the portfolio manager of
the Fund.  He has held this responsibility for the Fund since its inception in
December, 2000.  Before joining Thornburg he managed equity mutual funds with
another mutual fund management company.  Mr. __________ is assisted by other
employees of Thornburg.

Thornburg may, from time to time, agree to waive its fees or to reimburse the
Fund for expenses above a specified percentage of average daily net assets.
Thornburg retains the ability to be repaid by the Fund for these expense
reimbursements if expenses fall below the limit prior to the end of the fiscal
year.  Fee waivers or expenses by the Fund will boost its performance, and
repayment of waivers or reimbursements will reduce its performance.

In addition to Thornburg's fees, the Fund will pay all other costs and expenses
of its operations.  The Fund will not bear any costs of sales or promotion
incurred in connection with the distribution of its shares, except as described
above under "Buying Fund Shares".

Thornburg Securities Corporation (TSC) distributes and markets the Thornburg
Funds.  Thornburg or TSC may make payments from their own resources to assist
in the sales or promotion of the Fund.

H. Garrett Thornburg, Jr., a Director and Chairman of the Company, and a
Trustee and Chairman of the Trust, is the controlling stockholder of both
Thornburg and TSC.

<OUTSIDE BACK COVER>
ADDITIONAL INFORMATION

Reports to Shareholders
   Shareholders will receive annual
   reports of their Fund containing
   financial statements audited by the
   Fund's independent auditors, and
   also will receive unaudited semi-
   annual reports. In addition, each
   shareholder will receive an account
   statement no less often than quarterly.

General Counsel
   Legal matters in connection with
   the issuance of shares of the Funds
   are passed upon by White, Koch,
   Kelly & McCarthy, Professional
   Association, Post Office Box 787,
   Santa Fe, New Mexico 87504-0787.

Investment Adviser
   Thornburg Investment Management, Inc.
   119 East Marcy Street, Suite 202
   Santa Fe, New Mexico 87501

Distributor
   Thornburg Securities Corporation
   119 East Marcy Street, Suite 202
   Santa Fe, New Mexico 87501

Custodian
   State Street Bank & Trust Co.
   1 Heritage Drive
   North Quincy, Massachusetts 02171

Transfer Agent
   State Street Bank & Trust Co.
   c/o NFDS Servicing Agent
   Post Office Box 419017
   Kansas City, Missouri 64141-6017

Additional information about the Funds' investments is available in the Fund's
Annual and Semiannual Reports to Shareholders.  In the Fund's Annual Report you
will find a discussion of the market conditions and investment strategies which
significantly affected the Fund's performance during its last fiscal year.  The
Fund's Statement of Additional Information (SAI) and the Fund's Annual and
Semiannual Reports are available without charge upon request.  Shareholders may
make inquiries about the Fund, and investors may request copies of the SAI,
Annual and Semiannual Reports, and obtain other Fund information, by contacting
Thornburg Securities Corporation at 119 East Marcy Street, Suite 202, Santa Fe,
New Mexico 87501 (800) 847-0200.  The Fund's current SAI is incorporated in
this Prospectus by reference (legally forms a part of this Prospectus).

Information about the Fund (including the SAI) may be reviewed and copied at
the Securities and Exchange Commission's Public Reference Room in Washington,
D.C.  Information about the Public Reference Room may be obtained by calling
the Commission at 1-800-SEC-0330.  Reports and other information about the
Fund are also available on the Commission's Internet site at
http://www.sec.gov and copies of information may be obtained, upon payment of
a duplicating fee, by writing the Commission's Public Reference Section,
Washington, D.C. 20549-6009.

No dealer, sales representative or any other person has been authorized to
give any information or to make any representation not contained in this
Prospectus and, if given or made, the information or representation must not
be relied upon as having been authorized by the Fund or Thornburg Securities
Corporation. This Prospectus constitutes an offer to sell securities of the
Fund only in those states where the Fund's shares have been registered or
otherwise qualified for sale. The Fund will not accept applications from
persons residing in states where the Fund's shares are not registered.

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

Thornburg Growth Fund is a separate series of Thornburg Investment Trust,
which files its registration statements and certain other information with
the Commission under Investment Company Act of 1940 file number 811-05201.

<PAGE>



                    Statement of Additional Information
                                    for
                           Thornburg Growth Fund
                              ("Growth Fund")





























                      119 East Marcy Street, Suite 202
                         Santa Fe, New Mexico 87501


     Thornburg Growth Fund ("Growth Fund") is an investment portfolio
established by Thornburg Investment Trust (the "Trust").  This Statement of
Additional Information relates to the investments made or proposed to be made
by the Fund, investment policies governing the Fund, the Fund's management,
and other issues of interest to a prospective purchaser of Class A and Class
C shares offered by the Fund.

     This Statement of Additional Information is not a prospectus but should
be read in conjunction with the Fund's Prospectus dated December 27, 2000.  A
copy of the Prospectus and the most recent Annual and Semiannual Reports for
the Fund may be obtained at no charge by writing to the distributor of the
Funds' shares, Thornburg Securities Corporation, at 119 East Marcy Street,
Suite 202, Santa Fe, New Mexico 87501.

	Prior to October 1, 1995, the Trust's name was "Thornburg Income Trust."

     The date of this Statement of Additional Information is December 27,
2000.

<PAGE>
                             TABLE OF CONTENTS

ORGANIZATION OF THE FUND. . . . . . . . . . . . . . . . . . . .__

  Illiquid Investments. . . . . . . . . . . . . . . . . . . . .__
  Restricted Securities . . . . . . . . . . . . . . . . . . . .__
  Swap Agreements, Caps, Floors, Collars. . . . . . . . . . . .__
  Indexed Securities. . . . . . . . . . . . . . . . . . . . . .__
  Repurchase Agreements . . . . . . . . . . . . . . . . . . . .__
  Reverse Repurchase Agreements . . . . . . . . . . . . . . . .__
  Securities Lending. . . . . . . . . . . . . . . . . . . . . .__
  Lower-Quality Debt Securities . . . . . . . . . . . . . . . .__
  Foreign Investments . . . . . . . . . . . . . . . . . . . . .__
  Foreign Currency Transactions . . . . . . . . . . . . . . . .__
  Limitations on Futures and Options Transactions . . . . . . .__
  Real Estate-Related Instruments . . . . . . . . . . . . . . .__
  Futures Contracts . . . . . . . . . . . . . . . . . . . . . .__
  Futures Margin Payments-Value Fund. . . . . . . . . . . . . .__
  Purchasing Put and Call Options . . . . . . . . . . . . . . .__
  Writing Put and Call Options. . . . . . . . . . . . . . . . .__
  Combined Positions. . . . . . . . . . . . . . . . . . . . . .__
  Correlations of Price Changes . . . . . . . . . . . . . . . .__
  Liquidity of Options and Futures Contracts-OTC Options. . . .__
  Option and Futures Relating to Foreign Currencies . . . . . .__
  Asset Coverage for Futures and Options Positions. . . . . . .__
  Short Sales . . . . . . . . . . . . . . . . . . . . . . . . .__

YIELD AND RETURN COMPUTATION. . . . . . . . . . . . . . . . . .__
  Performance and Portfolio Information . . . . . . . . . . . .__

TAXES . . . . . . . . . . . . . . . . . . . . . . . . . . . . .__
  Federal Income Taxes-In General . . . . . . . . . . . . . . .__
  Federal Income Taxes. . . . . . . . . . . . . . . . . . . . .__
  State and Local Income Tax Considerations . . . . . . . . . .__

DISTRIBUTIONS AND SHAREHOLDERS ACCOUNTS . . . . . . . . . . . .__

INVESTMENT ADVISER, INVESTMENT ADVISORY AGREEMENT, AND
  ADMINISTRATIVE SERVICES AGREEMENT . . . . . . . . . . . . . .__
  Investment Advisory Agreement . . . . . . . . . . . . . . . .__
  Administrative Services Agreement . . . . . . . . . . . . . .__

SERVICE AND DISTRIBUTION PLANS. . . . . . . . . . . . . . . . .__

PORTFOLIO TRANSACTIONS. . . . . . . . . . . . . . . . . . . . .__
  In General. . . . . . . . . . . . . . . . . . . . . . . . . .__
  Growth Fund . . . . . . . . . . . . . . . . . . . . . . . . .__
  Portfolio Turnover Rates. . . . . . . . . . . . . . . . . . .__

MANAGEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . .__


                                 -i-


NET ASSET VALUE . . . . . . . . . . . . . . . . . . . . . . . .__

DISTRIBUTOR . . . . . . . . . . . . . . . . . . . . . . . . . .__

ADDITIONAL INFORMATION RESPECTING
PURCHASE AND REDEMPTION OF SHARES . . . . . . . . . . . . . . .__

INDEPENDENT AUDITORS. . . . . . . . . . . . . . . . . . . . . .__











































                                    -ii-

<PAGE>
                       ORGANIZATION OF THE FUND

     The Fund is a diversified series of Thornburg Investment Trust, a
Massachusetts business trust (the "Trust") organized on June 3, 1987 as a
diversified, open-end management investment company under a Declaration of
Trust (the "Declaration").  The Trust currently has nine active Funds, one
of which is described in this Statement of Additional Information.  The
Trustees are authorized to divide the Trust's shares into additional series
and classes.

     The assets received for the issue or sale of shares of the Fund and
all income, earnings, profits, and proceeds thereof, subject only to the
rights of creditors, are especially allocated to the Fund, and constitute
the underlying assets of that Fund.  The underlying assets of the Fund are
segregated on the books of account, and are charged with the liabilities
with respect to the Fund and with a share of the general expense of the
Trust.  Expenses with respect to the Trust are allocated in proportion to
the asset value of the respective series and classes of the Trust except
where allocations of direct expense can otherwise be fairly made.  The
officers of the Trust, subject to the general supervision of the Trustees,
determine which expenses are allocable to the Fund, or generally allocable
to all of the several funds of the Trust.  In the event of the dissolution
or liquidation of the Trust, shareholders of the Fund are entitled to
receive the underlying assets of that Fund which are available for
distribution.

     The Fund may in the future, rather than invest in securities
generally, seek to achieve its investment objectives by pooling its assets
with assets of other funds for investment in another investment company
having the same investment objective and substantially similar investment
policies and restrictions as the Fund.  The purpose of such an arrangement
is to achieve greater operational efficiencies and to reduce cost.  It is
expected that any such investment company would be managed by Thornburg
Investment Management, Inc. (Thornburg) in a manner substantially similar
to the corresponding Fund. Shareholders of the Fund would receive prior
written notice of any such investment, but may not be entitled to vote on
the action. Such an investment would be made only if at least a majority of
the Trustees of the Fund determined it to be in the best interest of the
Fund and its shareholders.

     The Trust is an entity of the type commonly known as a "Massachusetts
business trust."  Under Massachusetts law, shareholders of such a trust
may, under certain circumstances, be held personally liable for the
obligations of the trust.  The Declaration of Trust provides that the Trust
shall not have any claim against shareholders except for the payment of the
purchase price of shares.  However, the risk of a shareholder incurring
financial loss on account of shareholder liability is limited to
circumstances in which a fund itself would be unable to meet its
obligations.  Thornburg believes that, in view of the above, the risk of
personal liability to shareholders is remote.

     The Fund may hold special shareholder meetings and mail proxy
materials.  These meetings may be called to elect or remove Trustees,
change fundamental investment policies, or for other purposes.
Shareholders not attending these meetings are encouraged to vote by proxy.
The Fund will mail proxy materials in advance, including a voting card and
information about the proposals to be voted on.  The number of votes you
are entitled to is based upon the number of shares you own.  Shares do not
have cumulative rights or preemptive rights.

     State Street Bank and Trust, Boston, Massachusetts, is custodian of
the assets of the Fund. The Custodian is responsible for the safekeeping of
the Fund's assets and the appointment of subcustodian banks and clearing
agencies.  The Custodian takes no part in determining the investment
policies of the Fund or in deciding which securities are purchased or sold
by the Fund.


                          INVESTMENT POLICIES

Illiquid Investments
--------------------

     Illiquid investments are investments that cannot be sold or disposed
of in the ordinary course of business at approximately the prices at which
they are valued.  Under the supervision of the Trustees, the Fund's
investment adviser (Thornburg) determines the liquidity of investments by
the Fund.  In determining the liquidity of the Fund's investments,
Thornburg may consider various factors, including (1) the frequency of
trades and quotations, (2) the number of dealers and prospective purchasers
in the marketplace, (3) dealer undertakings to make a market, (4) the
nature of the security (including any demand or lender features), and (5)
the nature of the market place for trades (including the ability to assign
or offset the Fund's rights and obligations relating to the investment).

     Investments currently considered by the Fund to be illiquid include
repurchase agreements not entitling the holder to payment of principal and
interest within seven days, over-the-counter options, and non-government
stripped fixed-rate mortgage-backed securities. Also, Thornburg may
determine some restricted securities, government-stripped fixed-rate
mortgage-backed securities, emerging market securities, and swap agreements
to be illiquid.  However, with respect to over-the-counter options the Fund
writes, all or a portion of the value of the underlying instrument may be
illiquid depending on the assets held to cover the option and the nature
and terms of any agreement the Fund any have to close out the option before
expiration.

     In the absence of market quotations, illiquid investments are priced
at fair value as determined utilizing procedures and methods reviewed by
the Trustees.  If through a change in values, net assets, or other
circumstances, a Fund were in a position where more than 10% of its net
assets was invested in illiquid securities, it would seek to take
appropriate steps to protect liquidity.

Restricted Securities
---------------------

     Restricted securities generally can be sold in privately negotiated
transactions, pursuant to an exemption from registration under the
Securities Act of 1933, or in a registered public offering.  Where
registration is required, the Fund could be obligated to pay all or part of
the registration expense and a considerable period may elapse between the
time it decides to seek registration and the time it is permitted to sell a
security under an effective registration statement.  If, during such a
period, adverse market conditions were to develop, the Fund might obtain a
less favorable price than prevailed when it decided to seek registration of
the security.

Swap Agreements, Caps, Floors, Collars
--------------------------------------

     Swap agreements can be individually negotiated and structured to
include exposure to a variety of different types of investments or market
factors.  Depending on their structure, swap agreements may increase or
decrease the Fund's exposure to long or short-term interest rates (in the
U.S. or abroad), foreign currency values, mortgage securities, corporate
borrowing rates, or other factors such as security prices or inflation
rates.  The Fund is not limited to any particular form of swap agreement if
Thornburg determines it is consistent with the Fund's investment objective
and policies.

     Although swaps can take a variety of forms, typically one party pays
fixed and receives floating rate payments and the other party receives
fixed and pays floating payments.  An interest rate cap is an agreement
between two parties over a specified period of time where one party makes
payments to the other party equal to the difference between the current
level of an interest rate index and the level of the cap, if the specified
interest rate index increases above the level of the cap.  An interest rate
floor is similar except the payments are the difference between the current
level of an interest rate index and the level of the floor, if the
specified interest rate index decreases below the level of the floor.  An
interest rate collar is the simultaneous execution of a cap and floor
agreement on a particular interest rate index.  The purchase of a cap
entitles the purchaser to receive payments on a notional principal amount
from the party selling such cap to the extent that a specified index
exceeds a predetermined interest rate or amount.  Purchase of a floor
entitles the purchaser to receive payments on a notional principal amount
from the party selling such floor to the extent that a specified index
falls below a predetermined interest rate or amount.  A collar is a
combination of a cap and a floor that preserves a certain return within a
predetermined range of interest rates or values.

     Inasmuch as these swaps, floors, caps and collars are entered into for
good faith hedging purposes, Thornburg and the Fund believe these
obligations do not constitute senior securities under the 1940 Act and,
accordingly, will not treat them as being subject to borrowing
restrictions. The swap market has grown substantially in recent years with
a large number of banks and investment banking firms acting both as
principals and agents utilizing standardized swap documentation.  As a
result, the swap market has become relatively liquid.  Caps, floors and
collars are more recent innovations for which standardized documentation is
less highly developed and, accordingly, may be less liquid than swaps.

     Swap agreements will tend to shift the Fund's investment exposure from
one type of investment to another.  For example, if the Fund agreed to
exchange payments in dollars for payments in foreign currency, the swap
agreement would tend to decrease the Fund's exposure to U.S. interest rates
and increase its exposure to foreign currency and interest rates.  Caps and
floors have an effect similar to buying or writing options.  Depending on
how they are used, swap agreements may increase or decrease the overall
volatility of the Fund's investments and its share price and yield.  The
most significant factor in the performance of swap agreements is the change
in the specific interest rate, currency, or other factors that determine
the amounts of payments due to and from the Fund.  If a swap agreement
calls for payments by the Fund, the Fund must be prepared to make such
payments when due.  In addition, if the counterparty's credit worthiness
declined, the Fund will have contractual remedies available to it, but the
value of the swap or other agreement would be likely to decline,
potentially resulting in losses.  The Fund expects to be able to eliminate
its exposure under swap agreements either by assignment or other
disposition, or by entering into an offsetting swap agreement with the same
party or a similarly creditworthy party.

     The Fund will maintain appropriate liquid assets in a segregated
custodial account to cover its current obligations under swap agreements.
If the Fund enters into a swap agreement on other than a net basis, it will
segregate assets with a value equal to the full amount of the Fund's
accrued obligations under the agreement.

Indexed Securities
------------------

     The Fund may purchase securities whose prices are indexed to the
prices of other securities, securities indices, currencies, precious metals
or other commodities, or other financial indicators.  Indexed securities
typically, but not always, are debt securities or deposits whose value at
maturity or coupon rate is determined by reference to a specific instrument
or statistic. Gold-indexed securities, for example, typically provide for a
maturity value that depends on the price of gold, resulting in a security
whose price tends to rise and fall together with gold prices.  Currency
indexed securities typically are short-term to intermediate-term debt
securities whose maturity values or interest rates are determined by
reference to the values of one or more specified foreign currencies, and
may offer higher yields than U.S. dollar-denominated securities of
equivalent issuers.  Currency-indexed securities may be positively or
negatively indexed; that is, their maturity value may increase when the
specified currency value increases, resulting in a security that performs
similarly to a foreign-denominated instrument, or their maturity value may
decline when foreign currencies increases, resulting in a security whose
price characteristics are similar to a put on the underlying currency.
Currency-indexed securities may also have prices that depend on the values
of a number of different foreign currencies relative to each other.

     The performance of indexed securities depends to a great extent on the
performance of the security, currency or other instrument to which they are
indexed, and may also be influenced by interest rate changes in the U.S.
and abroad.  At the same time, indexed securities are subject to the credit
risks associated with the issuer of the security, and their values may
decline substantially if the issuer's creditworthiness deteriorates.
Recent issuers of indexed securities have included banks, corporations, and
certain U.S. government agencies.  Indexed securities may be more volatile
than their underlying instruments.

Repurchase Agreements
---------------------

     In a repurchase agreement, the Fund purchases a security and
simultaneously commits to resell that security to the seller at an agreed
upon price on an agreed upon date within a number of days from the date of
purchase.  The resale price reflects the purchase price plus an agreed upon
incremental amount which is unrelated to the coupon rate or maturity of the
purchased security.  A repurchase agreement involves the obligation of the
seller to pay the agreed upon price, which obligation is in effect secured
by the value (at least equal to the amount of the agreed upon resale price
and marked to market daily) of the underlying security.  The Fund may
engage in a repurchase agreements with respect to any security in which it
is authorized to invest.

     The Fund may enter into these arrangements with member banks of the
Federal Reserve System or any domestic broker-dealer if the
creditworthiness of the bank or broker-dealer has been determined by
Thornburg to be satisfactory.  These transactions may not provide the Fund
with collateral marked-to-market during the term of the commitment.

     For purposes of the Investment Company Act of 1940, a repurchase
agreement is deemed to be a loan from the Fund to the seller of the
security subject to the repurchase agreement and is therefore subject to
the Fund's investment restriction applicable to loans.  It is not clear
whether a court would consider the security purchased by the Fund subject
to a repurchase agreement as being owned by the Fund or as being collateral
for a loan by the Fund to the seller.  In the event of the commencement of
bankruptcy or insolvency proceedings with respect to the seller of the
security before repurchase of the security under a repurchase agreement,
the Fund may encounter delay and incur costs before being able to sell the
security.  Delays may involve loss of interest or decline in the price of
the underlying security.  If the court characterized the transaction as a
loan and the Fund has not perfected a security interest in the underlying
security, the Fund may be required to return the security to the seller's
estate and be treated as an unsecured creditor of principal and income
involved in the transaction. As with any unsecured debt obligation
purchased for the Fund, Thornburg seeks to minimize the risk of loss
through repurchase agreements by analyzing the creditworthiness of the
obligor, in this case the seller of the security. Apart from the risk of
bankruptcy or insolvency proceedings, there is also the risk that the
seller may fail to repurchase the security, in which case the Fund may
incur a loss if the proceeds to the Fund of the sale to a third party are
less than the repurchase price.  However, if the market value (including
interest) of the security subject to the repurchase agreement becomes less
than the repurchase price (including interest), the Fund will direct the
seller of the security to deliver additional securities so that the market
value (including interest) of all securities subject to the repurchase
agreement will equal or exceed the repurchase price.  It is possible that
the Fund will be unsuccessful in seeking to impose on the seller a
contractual obligation to deliver additional securities.

Reverse Repurchase Agreements
-----------------------------

     In a reverse repurchase agreement, the Fund sells a portfolio
instrument to another party, such as a bank or broker-dealer, in return for
cash and agrees to repurchase the instrument at a particular price and
time.  While a reverse repurchase agreement is outstanding, the Fund will
maintain appropriate liquid assets in a segregated custodial account to
cover its obligation under the agreement.  The Fund will enter into reverse
repurchase agreements only with parties whose creditworthiness has been
found satisfactory by Thornburg.  Such transactions may increase
fluctuations in the market value of the Fund's assets and may be viewed as
a form of leverage.

Securities Lending
------------------

     The Fund may lend securities to parties such as broker-dealers or
institutional investors.  Securities lending allows the Fund to retain
ownership of the securities loaned and, at the same time, to earn
additional income.  Since there may be delays in the recovery of loaned
securities, or even a loss of rights in collateral supplied should the
borrower fail financially, loans will be made only to parties deemed by
Thornburg to be of good standing.  Furthermore, they will only be made if,
in Thornburg's judgment, the consideration to be earned from such loans
would justify the risk.

     Thornburg understands that it is the current view of the SEC Staff
that a Fund may engage in loan transactions only under the following
conditions: (1) the Fund must receive 100% collateral in the form of cash
or cash equivalents (e.g., U.S. Treasury bills or notes) from the borrower;
(2) the borrower must increase the collateral whenever the market value of
the securities loaned (determined on a daily basis) rises above the value
of the collateral;  (3)  after giving notice, the Fund must be able to
terminate the loan at any time;  (4)  the Fund must receive reasonable
interest on the loan or a flat fee from the borrower, as well as amounts
equivalent to any dividends, interest, or other distributions on the
securities loaned and to any increase in market value;  (5)  the Fund may
pay only reasonable custodian fees in connection with the loan; and (6)
the Trustees must be able to vote proxies on the securities loaned, either
by terminating the loan or by entering into an alternative arrangement with
the borrower.

     Cash received through loan transactions may be invested in any
security in which the Fund is authorized to invest.  Investing this cash
subjects that investment, as well as the security loaned, to market forces
(i.e., capital appreciation or depreciation).

Lower-Quality Debt Securities
-----------------------------

     The Fund may purchase lower-quality debt securities (those rated below
Baa by Moody's Investors Service, Inc. or BBB by Standard and Poor's
Corporation, and unrated securities judged by Thornburg to be of equivalent
quality) that have poor protection with respect to the payment of interest
and repayment of principal, or may be in default.  These securities are
often considered to be speculative and involve greater risk of loss or
price changes due to changes in the issuer's capacity to pay.  The market
prices of lower-quality debt securities may fluctuate more than those of
higher-quality debt securities and may decline significantly in periods of
general economic difficulty, which may follow periods of rising interest
rates.

     While the market for high-yield corporate debt securities has been in
existence for many years and has weathered previous economic downturns, the
1980's brought a dramatic increase in the use of such securities to fund
highly leveraged corporate acquisitions and restructuring.  Past experience
may not provide an accurate indication of the future performance of the
high-yield bond market, especially during periods of economic recession.
In fact, from 1989 to 1991, the percentage of lower-quality securities that
defaulted rose significantly above prior levels, although the default rate
decreased in 1992 and 1993.

     The market for lower-quality debt securities may be thinner and less
active than that for higher-quality debt securities, which can adversely
affect the prices at which the former are sold.  If market quotations are
not available, lower-quality debt securities will be valued in accordance
with procedures established by the Trustees, including the use of outside
pricing services.  Judgment plays a greater role in valuing high-yield
corporate debt securities than is the case for securities for which more
external sources for quotations and last-sale information are available.
Adverse publicity and changing investor perceptions may affect the ability
of outside pricing services to value lower-quality debt securities and the
Fund's ability to sell these securities.  Since the risk of default is
higher for lower-quality debt securities, Thornburg's research and credit
analysis are an especially important part of managing securities of this
type held by the Fund.  In considering investments for the Fund, Thornburg
will attempt to identify those issuers of high-yielding securities whose
financial condition is adequate to meet future obligations, has improved,
or is expected to improve in the future.  Thornburg's analysis focuses on
relative values based on such factors as interest or dividend coverage,
asset coverage, earnings prospects, and the experience and managerial
strength of the issuer.

     The Fund may choose, at its expense or in conjunction with others, to
pursue litigation or otherwise to exercise its rights as a security holder
to seek to protect the interests of security holders if it determines this
to be in the best interest of the Fund's shareholders.

Foreign Investments
-------------------

     Foreign investments can involve significant risks in addition to the
risks inherent in U.S. investments.  The value of securities denominated in
or indexed to foreign currencies, and of dividends and interest from such
securities, can change significantly when foreign currencies strengthen or
weaken relative to the U.S. dollar.  Foreign securities markets generally
have less trading volume and less liquidity than U.S. markets, and prices
on some foreign markets can be highly volatile.  Many foreign countries
lack uniform accounting and disclosure standards comparable to those
applicable to U.S. companies, and it may be more difficult to obtain
reliable information regarding an issuer's financial condition and
operations.  It may be more difficult to obtain and enforce a judgment
against a foreign issuer.  In addition, the costs of foreign investing,
including withholding taxes, brokerage commissions, and custodial costs,
are generally higher than for U.S. investments.

     Foreign markets may offer less protection to investors than U.S.
markets.  Foreign issuers, brokers, and securities markets may be subject
to less government supervision.  Foreign security trading practices,
including those involving the release of assets in advance of payment, may
involve increased risks in the event of a failed trade or the insolvency of
a broker-dealer, and may involve substantial delays.  It may also be
difficult to enforce legal rights in foreign countries.

     Investing abroad also involves different political and economic risks.
Foreign investments may be affected by actions of foreign governments
adverse to the interests of U.S. investors, including the possibility of
expropriation or nationalization of assets, confiscatory taxation,
restrictions on U.S. investment or on the ability to repatriate assets or
convert currency into U.S. dollars, or other government intervention.
There may be a greater possibility of default by foreign governments or
foreign government-sponsored enterprises, and securities issued or
guaranteed by foreign governments, their agencies, instrumentalities, or
political subdivisions, may or may not be supported by the full faith and
credit and taxing power of the foreign government.  Investments in foreign
countries also involve a risk of local political, economic, or social
instability, military action or unrest, or adverse diplomatic developments.
There is no assurance that Thornburg will be able to anticipate these
potential events or counter their effects.

     The considerations noted above generally are intensified for
investments in developing countries.  Developing countries may have
relatively unstable governments, economies based on only a few industries,
and securities markets that trade a small number of securities.

     The Fund may invest in foreign securities that impose restrictions on
transfer within the U.S. or to U.S. persons. Although securities subject to
transfer restrictions may be marketable abroad, they may be less liquid
than foreign securities of the same class that are not subject to such
restrictions.

     American Depository Receipts and European Depository Receipts (ADR's
and EDR's) are certificates evidencing ownership of shares of a foreign-
based issuer held in trust by a bank or similar financial institution.
Designed for use in U.S. and European securities markets, respectively,
ADR's and EDR's are alternatives to the purchase of the underlying
securities in their national markets and currencies.

Foreign Currency Transactions
-----------------------------

     The Fund may conduct foreign currency transactions on a spot (i.e.,
cash) basis or by entering into forward contracts to purchase or sell
foreign currencies at a future date and price.  The Fund will convert
currency on a spot basis from time to time, and investors should be aware
of the costs of currency conversion.  Although foreign exchange dealers
generally do not charge a fee for conversion, they do realize a profit
based on the difference between the prices at which they are buying and
selling various currencies.  Thus, a dealer may offer to sell a foreign
currency to the Fund at one rate, while offering a lesser rate of exchange
should the Fund desire to resell that currency to the dealer.

     Forward contracts are generally traded in an interbank market
conducted directly between currency traders (usually large commercial
banks) and their customers.  The parties to a forward contract may agree to
offset or terminate the contract before its maturity, or may hold the
contract to maturity and complete the contemplated currency exchange.  The
Funds may use currency forward contracts for any purpose consistent with
their investment objectives.  The following discussion summarizes the
principal currency management strategies involving forward contracts that
could be used by the Fund.  The Fund may also use swap agreements, indexed
securities, and options and futures contracts relating to foreign
currencies for the same purposes.  When the Fund agrees to buy or sell a
security denominated in a foreign currency, it may desire to "lock in" the
U.S. dollar price of the security.  By entering into a forward contract for
the purchase or sale, for a fixed amount of U.S. dollars, of the amount of
foreign currency involved in the underlying security transaction, the Fund
will be able to protect itself against an adverse change in foreign
currency values between the date the security is purchased or sold and the
date on which payment is made or received.  This technique is sometimes
referred to as a "settlement hedge" or "transaction hedge."  The Fund also
may enter into forward contracts to purchase or sell a foreign currency in
anticipation of future purchases or sales of securities denominated in
foreign currency, even if the specific investments have not yet been
selected by Thornburg.

     The Fund may also use forward contracts to hedge against a decline in
the value of existing investments denominated in foreign currency.  For
example, if the Fund owned securities denominated in pounds sterling, it
could enter into a forward contract to sell pounds sterling in return for
U.S. dollars to hedge against possible declines in the pound's value.  Such
a hedge, sometimes referred to as a "position hedge," would tend to offset
both positive and negative currency fluctuations, but would not offset
changes in security values caused by other factors.  The Fund could also
hedge the position by selling another currency expected to perform
similarly to the pound sterling for example, by entering into a forward
contract to sell Deutschemarks or European Currency Units in return for
U.S. dollars.  This type of hedge, sometimes referred to as a "proxy
hedge," could offer advantages in terms of cost, yield, or efficiency, but
generally would not hedge currency exposure as effectively as a simple
hedge into U.S. dollars.  Proxy hedges may result in losses if the currency
used to hedge does not perform similarly to the currency in which the
hedged securities are denominated.

     The Fund may enter into forward contracts to shift investment exposure
from one currency into another.  This may include shifting exposure from
U.S. dollars to a foreign currency, or from one foreign currency to another
foreign currency.  For example, if the Fund held investments denominated in
deutschemarks, the Fund could enter into forward contracts to sell
deutschemarks and purchase Swiss francs.  This type of strategy, sometimes
known as a "cross hedge," will tend to reduce or eliminate exposure to the
currency that is sold, and increase exposure to the currency that is
purchased, much as if the Fund had sold a security denominated in one
currency and purchased an equivalent security denominated in another.
Cross-hedges protect against losses resulting from a decline in the hedged
currency, but will cause the Fund to assume the risk of fluctuations in the
value of the currency it purchases.  Under certain conditions, SEC
guidelines require mutual funds to set aside appropriate liquid assets in a
segregated custodial account to cover currency forward contracts.  As
required by SEC guidelines, the Fund will segregate assets to cover
currency forward contracts, if any, whose purpose is essentially
speculative.  The Fund will not segregate assets to cover forward contracts
entered into for hedging purposes, including settlement hedges, position
hedges, and proxy hedges.

     Because currency control is of great importance to the issuing
governments and influences economic planning and policy, purchases and
sales of currency and related instruments can be negatively affected by
government exchange controls, blockages, and manipulations or exchange
restrictions imposed by governments.  Those can result in losses to a Fund
if it is unable to deliver or receive currency in settlement of obligations
and could also cause hedges it has entered into to be rendered ineffective,
resulting in full currency exposure as well as incurring transaction costs.
Currency futures are also subject to risks pertaining to futures contracts
generally. See "Futures Contracts," below.  Options trading on currency
futures is subject to market liquidity, and establishing and closing
positions may be difficult.  Currency exchange rates may fluctuate based on
factors extrinsic to the issuing country's own economy.

     Successful use of currency management strategies will depend on
Thornburg's skill in analyzing and predicting currency values.  Currency
management strategies may substantially change the Fund's investment
exposure to changes in currency exchange rates, and could result in losses
to the Fund if currencies do not perform as Thornburg anticipates.  For
example, if a currency's value rose at a time when Thornburg had hedged the
Fund by selling that currency in exchange for dollars, the Fund would be
unable to participate in the currency's appreciation.  If Thornburg hedges
currency exposure through proxy hedges, the Fund could realize currency
losses from the hedge and the security position at the same time if the two
currencies do not move in tandem.  Similarly, if Thornburg increases the
Fund's exposure to a foreign currency, and that currency's value declines,
the Fund will realize a loss. There is no assurance that Thornburg's use of
currency management strategies will be advantageous to the Fund or that it
will hedge at an appropriate time.

Limitations on Futures and Options Transactions
-----------------------------------------------

     The Fund will not:  (a) sell futures contracts, purchase put options,
or write call options if, as a result, more than 25% of the Fund's total
assets would be hedged with futures and options under normal conditions;
(b) purchase futures contracts or write put options if, as a result, the
Fund's total obligations upon settlement or exercise of purchased futures
contracts and written put options would exceed 25% of its total assets; or
(c) purchase call options if, as a result, the current value of option
premiums for call options purchased by the Fund would exceed 5% of the
Fund's total assets.  These limitations do not apply to options attached to
or acquired or traded together with their underlying securities, and do not
apply to securities that incorporate features similar to options.

     The above limitations on the Fund's investments in futures contracts
and options, and the Fund's policies regarding futures contracts and
options discussed elsewhere in this Statement of Additional Information,
are not fundamental policies and may be changed as regulatory agencies
permit.

Real Estate-Related Instruments
-------------------------------

     Real estate-related instruments include real estate investment trusts,
commercial and residential mortgage-backed securities, and real estate
financings.  Real estate-related instruments are sensitive to factors such
as changes in real estate values and property taxes, interest rates, cash
flow of underlying real estate assets, over building, and the management
skill and creditworthiness of the issuer.  Real estate-related instruments
may also be affected by tax and regulatory requirements, such as those
relating to the environment.

Futures Contracts
-----------------

     When the Fund purchases a futures contract, it agrees to purchase a
specified underlying instrument at a specified future date.  When the Fund
sells a futures contract, it agrees to sell the underlying instrument at a
specified future date.  The price at which the purchase and sale will take
place is fixed when the Fund enters into the contract.  Some currently
available futures contracts are based on specific securities, such as U.S.
Treasury bonds or notes, and some are based on indices of securities
prices, such as the Standard & Poor's 500 Composite Stock Price Index (S&P
500).  Futures can be held until their delivery dates, or can be closed out
before then if a liquid secondary market is available.  The value of a
futures contract tends to increase and decrease in tandem with the value of
its underlying instrument.  Therefore, purchasing futures contracts will
tend to increase the Fund's exposure to positive and negative price
fluctuations in the underlying instrument, much as if it had purchased the
underlying instrument directly.  When the Fund sells a futures contract, by
contrast, the value of its futures position will tend to move in a
direction contrary to the market. Selling futures contracts, therefore will
tend to offset both positive and negative market price changes, much as if
the underlying instrument had been sold.

Futures Margin Payments
-----------------------

     The purchaser or seller of a futures contract is not required to
deliver or pay for the underlying instrument unless the contract is held
until the delivery date.  However both the purchaser and seller are
required to deposit "initial margin" with a futures broker, known as a
futures commission merchant (FCM), when the contract is entered into.
Initial margin deposits are typically equal to a percentage of the
contract's value.  If either party's position declines, that party will be
required to make additional "variation margin" payments to settle the
change in value on a daily basis.  The party that has a gain may be
entitled to receive all or a portion of this amount.  Initial and variation
margin payments do not constitute purchasing securities on margin for
purposes of the Fund's investment limitations.  In the event of the
bankruptcy of an FCM that holds margin on behalf of the Fund, the Fund may
be entitled to return of margin owed to it only in proportion to the amount
received by the FCM's other customers, potentially resulting in losses to
the Fund.

Purchasing Put and Call Options
-------------------------------

     By purchasing a put option, the Fund obtains the right (but not the
obligation) to sell the option's underlying instrument at a fixed strike
price.  In return for this right, the Fund pays the current market price
for the option (known as the option premium).  Options have various types
of underlying instruments, including specific securities, indices of
securities prices, and futures contracts.  The Fund may terminate its
position in a put option it has purchased by allowing it to expire or by
exercising the option. If the option is allowed to expire, the Fund will
lose the entire premium it paid.  If the Fund exercises the option, it
completes the sale of the underlying instrument at the strike price.  The
Fund may also terminate a put option position by closing it out in the
secondary market at its current price, if a liquid secondary market exists.

     The buyer of a typical put option can expect to realize a gain if
security prices fall substantially.  However, if the underlying
instrument's price does not fall enough to offset the cost of purchasing
the option, a put buyer can expect to suffer a loss (limited to the amount
of the premium paid, plus related transaction costs).

     The features of call options are essentially the same as those of put
options, except that the purchaser of a call option obtains the right to
purchase, rather than sell, the underlying instrument at the option's
strike price.  A call buyer typically attempts to participate in potential
price increases of the underlying instrument with risk limited to the cost
of the option if security prices fall.  At the same time, the buyer can
expect to suffer a loss if security prices do not rise sufficiently to
offset the cost of the option.

Writing Put and Call Options
----------------------------

     When a Fund writes a put option, it takes the opposite side of the
transaction from the option's purchaser.  In return for receipt of the
premium, the Fund assumes the obligation to pay the strike price for the
option's underlying instrument if the other party to the option chooses to
exercise it.  When writing an option on a futures contract the Fund will be
required to make margin payments to an FCM as described above for futures
contracts.  The Fund may seek to terminate its position in a put option it
writes before exercise by closing out the option in the secondary market at
its current price.  If the secondary market is not liquid for a put option
the Fund has written, however, the Fund must continue to be prepared to pay
the strike price while the option is outstanding, regardless of price
changes, and must continue to set aside assets to cover its position.

     If security prices rise, a put writer would generally expect to
profit, although its gain would be limited to the amount of the premium it
received. If security prices remain the same over time, it is likely that
the writer will also profit, because it should be able to close out the
option at a lower price.  If security prices fall, the put writer would
expect to suffer a loss.  This loss should be less than the loss from
purchasing the underlying instrument directly, however, because the premium
received for writing the option should mitigate the effects of the decline.
Writing a call option obligates the Fund to sell or deliver the option's
underlying instrument, in return for the strike price, upon exercise of the
option.  The characteristics of writing call options are similar to those
of writing put options, except that writing calls generally is a profitable
strategy if prices remain the same or fall.  Through receipt of the option
premium, a call writer mitigates the effects of  a price decline.

     At the same time, because a call writer must be prepared to deliver
the underlying instrument in return for the strike price, even if its
current value is greater, a call writer gives up some ability to
participate in security price increases.

Combined Positions
------------------

     The Fund may purchase and write options in combination with each
other, or in combination with futures or forward contracts, to adjust the
risk and return characteristics of the overall position.  For example, the
Fund may purchase a put option and write a call option on the same
underlying instrument, in order to construct a combined position whose risk
and return characteristics are similar to selling a futures contract.
Another possible combined position would involve writing a call option at
one strike price and buying a call option at a lower price, in order to
reduce the risk of the written call option in the event of a substantial
price increase.  Because combined options positions involve multiple
trades, they result in higher transaction costs and may be more difficult
to open and close out.  A combined transaction will usually contain
elements of risk that are present in each of its component transactions.
Although combined transactions are normally entered into based upon
Thornburg's judgment that the combined strategies will reduce risk or
otherwise achieve a portfolio management goal, it is possible that the
combination will instead increase risk or hinder achievement of the goal.

Correlation of Price Changes
----------------------------

     Because there are a limited number of types of exchange-traded options
and futures contracts, it is likely that the standardized contracts
available will not match the Fund's current or anticipated investments
exactly.  The Fund may invest in options and futures contracts based on
securities with different issuers, maturities, or other characteristics
from the securities in which it typically invests, which involves a risk
that the options or futures position will not track the performance of the
Fund's other investments.  Options and futures prices can also diverge from
the prices of their underlying instruments, even if the underlying
instruments match the Fund's investments well.  Options and futures prices
are affected by such factors as current and anticipated short-term interest
rates, changes in volatility of the underlying instrument, and the time
remaining until expiration of the contract, which may not affect security
prices the same way.  Imperfect correlation may also result from differing
levels of demand in the options and futures markets and the securities
markets, from structural differences in how options and futures and
securities are traded, or from imposition of daily price fluctuation limits
or trading halts.  The Fund may purchase or sell options and futures
contracts with a greater or lesser value than the securities it wishes to
hedge or intends to purchase in order to attempt to compensate for
differences in volatility between the contract and the securities, although
this may not be successful in all cases.  If price changes in the Fund's
options or futures positions are poorly correlated with its other
investments, the positions may fail to produce anticipated gains or result
in losses that are not offset by gains in other investments.

Liquidity of Options and Futures Contracts
------------------------------------------

     There is no assurance a liquid secondary market will exist for any
particular options or futures contract at any particular time.  Options may
have relatively low trading volume and liquidity if their strike prices are
not close to the underlying instrument's current price.  In addition,
exchanges may establish daily price fluctuation limits for options and
futures contracts, and may halt trading if a contract's price moves upward
or downward more than the limit in a given day.  On volatile trading days
when the price fluctuation limit is reached or a trading halt is imposed,
it may be impossible for the Fund to enter into new positions or close out
existing positions.  If the secondary market for a contract is not liquid
because of price fluctuation limits or otherwise, it could prevent prompt
liquidation of unfavorable positions, and potentially could require the
Fund to continue to hold a position until delivery or expiration regardless
of changes in its value.  As a result, the Fund's access to other assets
held to cover its options or futures positions could also be impaired.

OTC Options
-----------

     Unlike exchange-traded options, which are standardized with respect to
the underlying instrument, expiration date, contract size, and strike
price, the terms of over-the-counter options (options not traded on
exchanges) generally are established through negotiation with the other
party to the option contract.  While this type of arrangement allows the
Fund greater flexibility to tailor an option to its needs, OTC options
generally involve greater credit risk than exchange-traded options, which
are guaranteed by the clearing organization of the exchanges where they are
traded.  The staff of the SEC currently takes the position that OTC options
are illiquid, and investments by the Fund in those instruments are subject
to the Fund's limitation on investing no more than 10% of its assets in
illiquid instruments.

Options and Futures Relating to Foreign Currencies
-------------------------------------------------

     Currency futures contracts are similar to forward currency exchange
contracts, except that they are traded on exchanges (and have margin
requirements) and are standardized as to contract size and delivery date.
Most currency futures contracts call for payment or delivery in U.S.
dollars. The underlying instrument of a currency option may be a foreign
currency, which generally is purchased or delivered in exchange for U.S.
dollars, or may be a futures contract.  The purchaser of a currency call
obtains the right to purchase the underlying currency, and the purchaser of
a currency put obtains the right to sell the underlying currency.

     The uses and risks of currency options and futures are similar to
options and futures relating to securities or indices, as discussed above.
The Fund may purchase and sell currency futures and may purchase and write
currency options to increase or decrease its exposure to different foreign
currencies.  The Fund also may purchase and write currency options in
conjunction with each other or with currency futures or forward contracts.
Currency futures and options values can be expected to correlate with
exchange rates, but may not reflect other factors that affect the value of
the Fund's investments.  A currency hedge, for example, should protect a
Yen-denominated security from a decline in the Yen, but will not protect
the Fund against a price decline resulting from deterioration in the
issuer's creditworthiness.  Because the value of the Fund's foreign-
denominated investments changes in response to many factors other than
exchange rates, it may not be possible to match the amount of currency
options and futures to the value of the Fund's investments exactly over
time. See "Foreign Currency Transactions," above.

Asset Coverage for Futures and Options Positions
------------------------------------------------

     The Fund will comply with  guidelines established by the SEC with
respect to coverage of options and futures strategies by mutual funds, and
if the guidelines so require will set aside appropriate liquid assets in a
segregated custodial account in the amount prescribed.  Securities held in
a segregated account cannot be sold while the futures or option strategy is
outstanding, unless they are replaced with other suitable assets.  As a
result, there is a possibility that segregation of large percentage of the
Fund's assets could impede Fund management or the Fund's ability to meet
redemption requests or other current obligations.

Short Sales
-----------

     The Fund may enter into short sales with respect to stocks underlying
its convertible security holdings.  For example, if Thornburg anticipates a
decline in the price of the stock underlying a convertible security the
Fund holds, it may sell the stock short.  If the stock price subsequently
declines, the proceeds of the short sale could be expected to offset all or
a portion of the effect of the stock's decline on the value of the
convertible security.  The Fund currently intends to hedge no more than 15%
of its total assets with short sales on equity securities underlying its
convertible security holdings under normal circumstances.  When the Fund
enters into a short sale, it will be required to set aside securities
equivalent in kind and amount to those sold short (or securities
convertible or exchangeable into such securities) and will be required to
continue to hold them while the short sale is outstanding.  The Fund will
incur transaction costs, including interest expense, in connection with
opening, maintaining , and closing short sales.

                        INVESTMENT LIMITATIONS

     The following policies and limitations supplement those set forth in
the Prospectus.  Unless otherwise noted, whenever an investment policy or
limitation states a maximum percentage of the Fund's assets that may be
invested in any security or other asset, that percentage limitation will be
determined immediately after and as a result of the Fund's acquisition of
such security or other asset.  Accordingly, any subsequent change in
values, net assets, or other circumstances will not be considered when
determining whether the investment complies with the Fund's investment
policies and limitations.

     As a matter of fundamental policy, the Fund may not:

     (1)  with respect to 75% of the Fund's total assets, purchase the
securities of any issuer (other than securities issued or guaranteed by the
U.S. government or any of its agencies or instrumentalities) if, as a
result, (a) more than 5% of the Fund's total assets would be invested in
the securities of that issuer, or (b) the Fund would hold more than 10% of
the outstanding voting securities of that issuer;

     (2)  issue senior securities, except as permitted under the Investment
Company Act of 1940;

     (3)  borrow money, except for temporary or emergency purposes or
except in connection with reverse repurchase agreements; in an amount not
exceeding 33-1/3% of its total assets (including the amount borrowed) less
liabilities (other than borrowings).  Any borrowings that come to exceed
this amount will be reduced within three days (not including Sundays and
holidays) to the extent necessary to comply with the 33-1/3% limitation;

     (4)  underwrite any issue of securities (except to the extent that the
Fund may be deemed to be an underwriter within the meaning of the
Securities Act of 1933 in the disposition of restricted securities);

     (5)  purchase the securities of any issuer (other than securities
issued or guaranteed by the U.S. government or any of its agencies or
instrumentalities) if, as a result, more than 25% of the Fund's total
assets would be invested in the securities of companies whose principal
business activities are in the same industry;

     (6)  purchase or sell real estate unless acquired as a result or
ownership of securities or other instruments (but this shall not prevent
the Fund from investing in securities or other instruments backed by real
estate or securities of companies engaged in the real estate business);

     (7)  purchase or sell physical commodities unless acquired as a result
of ownership of securities or other instruments (but this shall not prevent
the Fund from purchasing or selling options and futures contracts or from
investing in securities or other instruments backed by physical
commodities); or

     (8)  lend any security or make any other loan if, as a result, more
than 33 1/3% of its total assets would be lent to other parties, but this
limitation does not apply to purchases of debt securities or to repurchase
agreements.

     The following investment limitations are not fundamental and may be
changed without shareholder approval as to the Fund:

     (i)  The Fund does not currently intend to sell securities short,
unless it owns or has the right to obtain securities equivalent in kind and
amount to the securities sold short, and provided that transactions in
futures contracts and options are not deemed to constitute selling
securities short.

     (ii)  The Fund does not currently intend to purchase securities on
margin, except that the Fund may obtain such short-term credits as are
necessary for the clearance of transactions, and provided that margin
payments in connection with futures contracts and options on futures
contracts shall not constitute purchasing securities on margin.

     (iii)  The Fund may borrow money only (a) from a bank or (b) by
engaging in reverse repurchase agreements with any party.  The Fund will
not purchase any security while borrowings representing more than 5% of its
total assets are outstanding.

     (iv)  The Fund does not currently intend to purchase any security if,
as a result, more than 10% of its net assets would be invested in
securities that are deemed to be illiquid because they are subject to legal
or contractual restrictions on resale or because they cannot be sold or
disposed of in the ordinary course of business at approximately the prices
at which they are valued.

     (v)  The Fund does not currently intend to purchase interests in real
estate investment trusts that are not readily marketable or interests in
real estate limited partnerships that are not listed on an exchange or
traded on the NASDAQ National Market System if, as a result, the sum of
such interests and other investments considered illiquid under the
limitation in the preceding paragraph would exceed the Fund's limitations
on investments in illiquid securities.

     (vi)  The Fund does not currently intend to (a) purchase securities of
other investment companies, except in the open market where no commission
except the ordinary broker's commission is paid, or (b) purchase or retain
securities issued by other open-end investment companies.  Limitations (a)
and (b) do not apply to securities received as dividends, through offers of
exchange, or as a result of a reorganization, consolidation, or merger.

     (vii)  The Fund does not currently intend to purchase the securities
of any issuer (other than securities issue or guaranteed by domestic or
foreign governments or political subdivisions thereof) if, as a result,
more than 5% of its total assets would be invested in the securities of
business enterprises that, including predecessors, have a record of less
than three years of continuous operation.

     (viii)  The Fund does not currently intend to purchase warrants,
valued at the lower of cost or market, in excess of 5% of the Fund's net
assets.  Included in that amount, but not to exceed 2% of the Fund's net
assets, may be warrants that are not listed on the New York Stock Exchange
or the American Stock exchange.  Warrants acquired by the Fund in units or
attached to securities are not subject to these restrictions.

     (ix)  The Fund does not currently intend to invest in oil, gas or
other mineral exploration or development programs or leases.

     (x)  The Fund does not currently intend to purchase the securities of
any issuer if those officers and Trustees of the trust and those officers
and directors of Thornburg who individually own more than 1/2 of 1% of the
securities of such issuer together own more than 5% of such issuer's
securities.

     For the Fund's limitations on futures and options transactions, see
the section entitled "Limitations on Futures and Options Transactions -
Value Fund and Global Value Fund."


                        YIELD AND RETURN COMPUTATION

Performance and Portfolio Information
-------------------------------------

     The Fund will from time to time display performance information,
including yield, dividend returns total return, and average annual total
return, in advertising, sales literature, and reports to shareholders.
Yield is computed by dividing the Fund's net interest and dividend income
for a given 30 days or one month period by the maximum share offering price
at the end of the period.  The result is "annualized" to arrive at an
annual percentage rate.  In addition, the Fund may use the same method for
90 day or quarterly periods.  Total return is the change in share value
over time, assuming reinvestment of any dividends and capital gains.
"Cumulative total return" describes total return over a stated period,
while "average annual total return" is a hypothetical rate of return which,
if achieved annually, would have produced the same cumulative total return
if performance had been constant for the period shown.  Average annual
return tends to reduce variations in return over the period, and investors
should recognize that the average figures are not the same as actual annual
returns.  The Fund may display return information for differing periods
without annualizing the results and without taking sales charges into
effect.

     All performance figures are calculated separately for Class A and
Class C shares.  The figures are historical, and do not predict future
returns.  Actual performance will depend upon the specific investments held
by the Fund, and upon the Fund's expenses for the period.

     Yield quotations include a standardized calculation which computes
yield for a 30-day or one month  period by dividing net investment income
per share during the period by the maximum offering price on the last day
of the period.  The standardized calculation will include the effect of
semiannual compounding and will reflect amortization of premiums for those
bonds which have a market value in excess of par.  New schedules based on
market value will be computed each month for amortizing premiums.  With
respect to mortgage-backed securities or other receivables-backed
obligations, the Fund will amortize the discount or premium on the
outstanding principal balance, based upon the cost of the security, over
the remaining term of the security. Gains or losses attributable to actual
monthly paydowns on mortgage-backed obligations will be reflected as
increases or decreases to interest income during the period when such gains
or losses are realized.  Provided that any such quotation is also
accompanied by the standardized calculation referred to above, the Fund may
also quote non-standardized performance data for a specified period by
dividing the net investment income per share for that period by either the
Fund's average public offering price per share for that same period or the
offering price per share on the first or last day of the period, and
multiplying the result by 365 divided by the number of days in the
specified period.  For purposes of this non-standardized calculation, net
investment income will include accrued interest income plus or minus any
amortized purchase discount or premium less all accrued expenses.  The
primary differences between the results obtained using the standardized
performance measure and any non-standardized performance measure will be
caused by the following factors:  (1) The non-standardized calculation may
cover periods other than the 30-day or one month period required by the
standardized calculation; (2) The non-standardized calculation may reflect
amortization of premium based upon historical cost rather than market
value; (3) The non-standardized calculation may reflect the average
offering price per share for the period or the beginning offering price per
share for the period, whereas the standardized calculation always will
reflect the maximum offering price per share on the last day of the period;
(4) The non-standardized calculation may reflect an offering price per
share other than the maximum offering price, provided that any time the
Fund's return is quoted in reports, sales literature or advertisements
using a public offering price which is less than the Fund's maximum public
offering price, the return computed by using the Fund's maximum public
offering price also will be quoted in the same piece; (5) The
non-standardized return quotation may include the effective return obtained
by compounding the monthly dividends.

     For the Fund's investments denominated in foreign currencies, income
and expenses are calculated first in their respective currencies, and are
then converted to U.S. dollars, either when they are actually converted or
at the end of the 30-day or one month period, whichever is earlier.
Capital gains and losses generally are excluded from the calculation as are
gains and losses from currency exchange rate fluctuations.

     Income calculated for the purposes of calculating the Fund's yields
differs from income as determined for other accounting purposes.  Because
of the different accounting methods used, and because of the compounding of
income assumed in yield calculations, the Fund's yield may not equal its
distribution rate, the income paid to a shareholder's account, or the
income reported in the Fund's financial statements.

     Yield information may be useful in reviewing the Fund's performance
and in providing a basis for comparison with other investment alternatives.
However, the Fund's yield fluctuates, unlike investments that pay a fixed
interest rate over a stated period of time.  When comparing investment
alternatives, investors should also note the quality and maturity of the
portfolio securities of respective investment companies they have chosen to
consider.

     Total returns quoted in advertising reflect all aspects of the Fund's
return, including the effect of reinvesting dividends and capital gain
distributions, and any change in the Fund's net asset value (NAV) over a
stated period.  Average annual total returns are calculated by determining
the growth or decline in value of a hypothetical historical investment in
the Fund over a stated period, and then calculating the annually compounded
percentage rate that would have produced the same result if the rate of
growth or decline in value had been constant over the period.  For example,
a cumulative total return of 100% over ten years would produce an average
annual return of 7.18%, which is the steady annual rate of return that
would equal 100% growth on a compounded basis in ten years.  While average
annual returns are a convenient means of comparing investment alternatives,
investors should realize that the Fund's performance is not constant over
time, but changes from year to year, and the average annual returns
represent averaged figures as opposed to the actual year-to-year
performance of the Fund.  In addition to average annual total returns, the
Fund may quote unaveraged or cumulative total returns reflecting the simple
change in value an investment over a stated period.  Average annual and
cumulative total returns may be quoted as a percentage or as a dollar
amount, and may be calculated for a single investment, a series of
investments, or a series of redemptions, over any time period.  Total
returns may be broken down into their components of income and capital
(including capital gains and changes to share price) in order to illustrate
the relationship of these factors and their contributions to total return.
Total returns may be quoted on a before-tax or after-tax basis and may be
quoted with or without taking the Fund's maximum sales charge into account.
Excluding the Fund's sales charge from a total return calculation produces
a higher total return figure.  Total returns, yields, and other performance
information may be quoted numerically or in a table, graph, or similar
illustration.

     Charts and graphs using the Fund's net asset values, adjusted net
asset values, and benchmark indices may be used to exhibit performance.  An
adjusted NAV includes any distributions paid by the Fund and reflects all
elements of its return.  Unless otherwise indicated, the Fund's adjusted
NAV's are not adjusted for sales charges, if any.

     The Fund may illustrate performance using moving averages.  A long-
term moving average is the average of each week's adjusted closing NAV or
total return for a specified period.   A short-term moving average NAV is
the average of each day's adjusted closing NAV for a specified period.
Moving average activity indicators combine adjusted closing NAV's from the
last business day of each week with moving averages for a specified period
the produce indicators showing when an NAV has crossed, stayed above, or
stayed below its moving average.

     The Fund's performance may be compared to the performance of other
mutual funds in general, or to the performance of particular types of
mutual funds.  These comparisons may be expressed as mutual fund ranking
prepared by Lipper Analytical Services, Inc. (Lipper), an independent
service located in Summit, New Jersey that monitors the performance of
mutual funds.  Lipper generally ranks funds on the basis of total return,
assuming reinvestment of distributions, but does not take sales charges or
redemption fees into consideration, and is prepared without regard to tax
consequences.  In addition to the mutual fund rankings the Fund's
performance may be compared to stock, bond, and money market mutual fund
performance indices prepared by Lipper or other organizations.  When
comparing these indices, it is important to remember the risk and return
characteristics of each type of investment.  For example, while stock
mutual funds may offer higher potential returns, they also carry the
highest degree of share price volatility.  Likewise, money market funds may
offer greater stability of principal, but generally do not offer the higher
potential returns from stock mutual funds.  From time to time, the Fund's
performance may also be compared to other mutual funds tracked by financial
or business publications and periodicals.  For example, the Fund may quote
Morningstar, Inc. in its advertising materials.  Morningstar, Inc. is a
mutual fund rating service that rates mutual funds on the basis of risk-
adjusted performance. Rankings that compare the performance different
Thornburg funds to one another in appropriate categories over specific
periods of time may also be quoted in advertising.  Performance rankings
and ratings reported periodically in financial publications such as "MONEY"
magazine, "Forbes" and "BARRON's" also may be used.  These performance
analyses ordinarily do not take sales charges into consideration and are
prepared without regard to tax consequences.

     Thornburg may provide information designed to help individuals
understand their investment goals and explore various financial strategies.
Such information may include information about current economic market, and
political conditions; materials that describe general principles of
investing, such as asset allocation, diversification, risk tolerance, and
goal setting; questionnaires designed to help create a personal financial
profile; worksheets used to project savings needs bases on assumed rates of
inflation and hypothetical rates of return; and action plans offering
investment alternatives.  Materials may also include discussions of other
Thornburg mutual funds.

     Ibbotson Associates of Chicago, Illinois (Ibbotson) provides
historical returns of the capital markets in the United States, including
common stocks, small capitalization stocks, long-term corporate bonds,
intermediate-term government bonds, long-term government bonds, Treasury
bills, the U.S. rate of inflation (based on the CPI), and combinations of
various capital markets. The performance of these capital markets is based
on the returns of differed indices.

     The Fund may use the performance of these capital markets in order to
demonstrate general risk-versus-reward investment scenarios.  Performance
comparisons may also include the value of a hypothetical investment in any
of these capital markets.  The risks associated with the security types in
the capital market may or may not correspond directly to those of the Fund.
The Fund may also compare performance to that of other compilations or
indices that may be developed and made available in the future, and
advertising, sales literature and shareholder reports also may discuss
aspects of periodic investment plans, dollar cost averaging and other
techniques for investing to pay for education, retirement and other goals.
In addition, the Fund may quote or reprint financial or business
publications and periodicals, including model portfolios or allocations, as
they relate to current economic and political conditions, fund management,
portfolio composition, investment philosophy, investment techniques and the
desirability of owning a particular mutual fund.  The Fund may present its
fund number, Quotron (trademark) number, and CUSIP number, and discuss or
quote its current portfolio managers.

     The Fund may quote various measures of volatility and benchmark
correlation in advertising.  In addition, the Fund may compare these
measures to those of other funds.  Measures of volatility seek to compare
the Fund's historical share price fluctuations or total returns to those of
a benchmark.  Measures of benchmark correlation indicate how valid a
comparative benchmark may be.  All measures of volatility and correlation
are calculated using averages of historical data.  In advertising, the Fund
may also discuss or illustrate examples of interest rate sensitivity.

     Momentum Indicators show the Fund's price movements over specific
periods of time.  Each point on the momentum indicator represents the
Fund's percentage change in price movements over that period.  The Fund may
advertise examples of the effects of periodic investment plans, including
the principle of dollar cost averaging.  In such a program, an investor
invests a fixed dollar amount in a fund at periodic intervals, thereby
purchasing fewer shares when prices are high and more shares when prices
are low.  While such a strategy does not assure a profit or guard against
loss in a declining market, the investor's average cost per share can be
lower than if fixed numbers of shares are purchased at the same intervals.
In evaluating such a plan, investors should consider their ability to
continue purchasing shares during periods of low price levels.  The Fund
may be available for purchase through retirement plans or other programs
offering deferral of, or exemption from, income taxes, which may produce
superior after-tax returns over time.  For example, a $1,000 investment
earning a taxable return of 10% annually would have an after-tax value of
$1,949 after ten years, assuming tax was deducted from the return each year
at a 31% rate.  An equivalent tax-deferred investment would have an after-
tax value of $2,100 after ten years, assuming tax was deducted at a 31%
rate from the tax-deferred earnings at the end of the ten-year period.

TAXES

In General

     The Fund intends to elect and qualify for treatment as a regulated
investment company under Subchapter M of the Internal Revenue Code of 1986,
as amended (the "Code").

     If in any year the Fund fails to qualify for the treatment conferred
by Subchapter M of the Code, the Fund would be taxed as a corporation on
its income.  Distributions to the shareholders would be treated as ordinary
income to the extent of the Fund's earnings and profits, and would be
treated as nontaxable returns of capital to the extent of the shareholders'
respective bases in their shares.  Further distributions would be treated
as amounts received on a sale or exchange or property.  Additionally, if in
any year  the Fund qualified as a regulated investment company but failed
to distribute all of its net income, the Fund would be taxable on the
undistributed portion of its net income.  Although the Fund intends to
distribute all of its net income currently, it could have undistributed net
income if, for example, expenses of the Fund were reduced or disallowed on
audit.

     The Code imposes a nondeductible 4% excise tax on regulated investment
companies which do not distribute to shareholders by the end of each
calendar year the sum of (i) 98% of the company's net ordinary income
realized in the year, (ii) 98% of the company's net capital gain income for
the 12-month period ending on October 31 of that year, and (iii) the excess
of (A) the sum of the amounts in (i) and (ii) for the prior calendar year
plus all amounts from earlier years which are not treated as having been
distributed under this provision, over (B) actual distributions for the
preceding calendar years.  The effect of this excise tax will be to cause
the Fund to distribute substantially all of its income during the calendar
year in which the income is earned.  Shareholders will be taxed on the full
amount of the distribution declared by the Fund for each such year,
including declared distributions not actually paid until January 31 of the
next calendar year.

     Each shareholder will be notified annually by the Fund as to the
amount and characterization of distributions paid to or reinvested by the
shareholder for the preceding taxable year.  The Fund may be required to
withhold federal income tax at a rate of 31% from distributions otherwise
payable to a shareholder if (i) the shareholder has failed to furnish the
Fund with his taxpayer identification number, (ii) the Fund is notified
that the shareholder's number is incorrect, (iii) the Internal Revenue
Service notifies the Fund that the shareholder has failed properly to
report certain income, or (iv) when required to do so, the shareholder
fails to certify under penalty of perjury that he is not subject to this
withholding.

     Effective for sales charges incurred after October 3, 1989 if the
shareholder disposes of shares within 90 days after purchasing them, and
later acquires shares for which the sales charge is eliminated or reduced
pursuant to a reinvestment  right, then the original sales charge to the
extent of the reduction is not included in the basis of the shares sold for
determining gain or loss.  Instead, the reduction is included in
determining the basis of the reinvested shares.

     Distributions by the Fund result in a reduction in the net asset value
of the Fund's shares. Should distributions reduce the net asset value below
a shareholder's cost basis, the distribution would nevertheless be taxable
to the shareholder as ordinary income or capital gain as described above,
even though, from an investment standpoint, it may constitute a partial
return of capital.  In particular, investors should consider the tax
implications of buying shares just prior to a distribution.  The price of
shares purchased at that time includes the amount of the forthcoming
distribution.  Those purchasing just prior to a distribution will then
receive a partial return of capital upon the distribution, which will
nevertheless be taxable to them.

     If the Fund holds zero coupon securities or other securities which are
issued at discount, a portion of the difference between the issue price and
the face amount of zero coupon securities ("original issue discount") will
be treated as ordinary income if the Fund holds securities with original
issue discount each year, although no current payments will be received by
the Fund with respect to that income.  This original issue discount will
comprise a part of that investment company taxable income of the Fund which
must be distributed to shareholders in order to maintain its qualification
as a regulated investment company and to avoid federal income tax on the
Fund.

Federal Income Taxes
--------------------

     Gains (losses) attributable to foreign currency fluctuations are
generally taxable as ordinary income and therefore will increase (decrease)
dividend distributions.  Net short-term capital gains are distributed as
dividend income.  The Fund will send each shareholder a notice in January
describing the tax status of dividends and capital gain distributions for
the prior year.

     Long-term capital gains earned by the Fund on the sale of securities
and distributed to shareholders are federally taxable as long-term capital
gains, regardless of the length of time shareholders have held their
shares. If a shareholder receives a long-term capital gain distribution on
shares of the Fund and such shares are held 12 months or less and are sold
at a loss, the portion of the loss equal to the amount of the long-term
capital gain distribution will be considered a long-term loss for tax
purposes.  Net short-term capital gains distributed by the Fund are taxable
to shareholders as dividends, not as capital gains.

     Redemption or resale of shares will be a taxable transaction for
federal income tax purposes and the shareholder will recognize gain or loss
in an amount equal to the difference between the shareholder's basis in the
shares and the amount realized by the shareholder on the redemption or
resale.  If the shareholder held the shares as capital assets, the gain or
loss will be long-term if the shares were held for more than 12 months, and
any such long-term gain generally will be subject to a maximum federal
income tax rate of 20% to the extent that gain exceeds any net short-term
capital losses realized by the taxpayer.

     Effective for sales charges incurred after October 3, 1989 if the
shareholder disposes of shares within 90 days after purchasing them, and
later acquires shares for which the sales charge is eliminated or reduced
pursuant to a reinvestment right, then the original sales charge to the
extent of the reduction is not included in the basis of the shares sold for
determining gain or loss.  Instead, the reduction is included in
determining the basis of the reinvested shares.

     Foreign governments may withhold taxes on dividends and interest paid
with respect to foreign securities typically at a rate between 10% and 35%.
Foreign governments may also impose taxes on other payments or gains with
respect to foreign securities.  Because the Fund does not currently
anticipate that securities of foreign issuers will constitute more than 50%
of its total assets at the end of its fiscal year, shareholders of the Fund
should not expect to claim a foreign tax credit or deduction on their
federal income tax returns with respect to foreign taxes withheld.

     The foregoing is a general and abbreviated summary of the provisions
of the Code and Treasury Regulations currently in effect as they directly
govern the income taxation of Fund shareholders.  This summary primarily
addresses income tax consequences to shareholders who are individuals.  The
Code and Regulations are subject to change at any time, in some cases
retroactively.  Shareholders are advised to consult their own tax advisers
for more detailed information concerning the federal tax consequences of an
investment in the Fund.

State and Local Income Tax Considerations
-----------------------------------------

     Shareholders may be subject to state and local taxes on Fund
distributions, and capital gains taxation on disposition of shares.  Shares
also may be subject, in some jurisdictions, to state and local property
taxes.  A portion of the Fund's dividends derived from certain U.S.
Government obligations may be exempt from state and local taxation.
Shareholders should consult their own tax advisers for information
concerning the state and local taxation of an investment in the Fund.

                  DISTRIBUTIONS AND SHAREHOLDERS ACCOUNTS

     When an investor or the investor's financial advisor makes an initial
investment in shares of the Fund, the Transfer Agent will open an account
on the books of the Fund, and the investor or financial advisor will
receive a confirmation of the opening of the account.  Thereafter, whenever
a transaction, other than the reinvestment of interest income, takes place
in the account such as a purchase of additional shares or redemption of
shares the investor or the financial advisor will receive a confirmation
statement giving complete details of the transaction.  Shareholders also
will receive at least quarterly statements setting forth all distributions
of interest income and other transactions in the account during the period
and the balance of full and fractional shares.  The final statement for the
year will provide information for income tax purposes.

     The distributions of investment income, net of expenses, and the
annual distributions of net realized capital gains, if any, will be
credited to the accounts of shareholders in full and fractional shares of
the Fund at net asset value on the payment or distribution date, as the
case may be.  Upon written notice to the Transfer Agent, a shareholder may
elect to receive periodic distributions of net investment income in cash.
Such an election will remain in effect until changed by written notice to
the Transfer Agent, which change may be made at any time in the sole
discretion of the shareholder.

            INVESTMENT ADVISER, INVESTMENT ADVISORY AGREEMENTS,
                  AND ADMINISTRATIVE SERVICES AGREEMENTS

Investment Advisory Agreement

     Pursuant to an Investment Advisory Agreement in respect of the Fund,
Thornburg Investment Management, Inc. ("Thornburg"), 119 East Marcy Street,
Suite 202, Santa Fe, New Mexico 87501, acts as investment adviser for, and
will manage the investment and reinvestment of the assets of the Fund in
accordance with the Fund's investment objectives and policies, subject to
the general supervision and control of the trustees of Thornburg Investment
Trust.

     Thornburg is paid a fee by the Fund, in the percentage amounts set
forth in the table below:

------------------
Net Assets of Fund			Advisory Fee Rate
------------------             -----------------

0 to $500 million                   .875%
$500 million to $1 billion          .825%
$1 billion to $1.5 billion          .775%
$1.5 billion to $2 billion          .725%
Over $2 billion                     .625%

     The fee paid by the Fund is allocated among the different classes of
shares offered by the Fund based upon the average daily net assets of each
class of shares.  All fees and expenses are accrued daily and deducted
before payment of dividends.  In addition to the fees of Thornburg, the
Fund will pay all other costs and expenses of its operations.  The Fund
also will bear the expenses of registering and qualifying the Fund and its
shares for distribution under federal and state securities laws, including
legal fees.

     The Trust's Trustees (including a majority of the Trustees who are not
"interested persons") have approved the Investment Advisory Agreement
applicable to the Value Fund.

     The Investment Advisory Agreement applicable to the Fund may be
terminated by either party, at any time without penalty, upon 60 days'
written notice, and will terminate automatically in the event of its
assignment.  Termination will not affect the right of Thornburg to receive
payments on any unpaid balance of the compensation earned prior to
termination.  The Agreement further provides that in the absence of willful
misfeasance, bad faith or gross negligence on the part of Thornburg, or of
reckless disregard of its obligations and duties under the Agreement,
Thornburg will not be liable for any action or failure to act in accordance
with its duties thereunder.  No amounts have been paid to Thornburg by the
Fund under the Agreement as of the date of this Statement of Additional
Information.

     Thornburg may (but is not obligated to) waive its rights to any
portion of its fees in the future, and may use any portion of its fee for
purposes of shareholder and administrative services and distribution of
fund shares.

     H. Garrett Thornburg, Jr., Treasurer, Director and Chairman of the
Board of Thornburg Limited Term Municipal Fund, Inc., and President and
Trustee of Thornburg Investment Trust, is also Director and controlling
shareholder of Thornburg.

Administrative Services Agreement
---------------------------------

     Administrative services are provided to each class of shares issued by
the Fund under an Administrative Services Agreement which requires the
delivery of administrative functions necessary for the maintenance of the
shareholders of the class, supervision and direction of shareholder
communications, assistance and review in preparation of reports and other
communications to shareholders, administration of shareholder assistance,
supervision and review of bookkeeping, clerical, shareholder and account
administration and accounting functions, supervision or conduct of
regulatory compliance and legal affairs, review and administration of
functions delivered by outside service providers to or for shareholders,
and other related or similar functions as may from time to time be agreed.
The Administrative Services Agreement specific to the Fund's Class A and
Class C shares provides that the class will pay a fee calculated at an
annual percentage of .125% of the class's average daily net assets, paid
monthly, together with any applicable sales or similar tax.  Services are
currently provided under these agreements by Thornburg.  No amounts have
been paid to Thornburg by the Fund under its Administrative Services
Agreements as of the date of this Statement of Additional Information.

     The agreements applicable to each class may be terminated by either
party, at any time without penalty, upon 60 days' written notice, and will
terminate automatically upon assignment.  Termination will not affect the
service provider's right to receive fees earned before termination.  The
agreements further provide that in the absence of willful misfeasance, bad
faith or gross negligence on the part of the service provider, or reckless
disregard of its duties thereunder, the provider will not be liable for any
action or failure to act in accordance with its duties thereunder.

                       SERVICE AND DISTRIBUTION PLANS

Service Plans - All Classes

     The Fund has adopted a plan and agreement of distribution pursuant to
Rule 12b-1 under the Investment Company Act of 1940 ("Service Plan") which
is applicable to Class A and Class C shares of the Fund.  The Plan permits
the Fund to pay to Thornburg (in addition to the management fee and
reimbursements described above) an annual amount not exceeding .25 of 1% of
each class's assets to reimburse Thornburg for specific expenses incurred
by it in connection with certain shareholder services and the distribution
of that class's shares to investors.  Thornburg may, but is not required
to, expend additional amounts from its own resources in excess of the
currently reimbursable amount of expenses.  Reimbursable expenses include
the payment of amounts, including incentive compensation, to securities
dealers and other financial institutions, including banks (to the extent
permissible under the Glass-Steagall Act and other federal banking laws),
for administration and shareholder services.  The nature and scope of
services provided by dealers and other entities likely will vary from
entity to entity, but may include, among other things, processing new
account applications, preparing and transmitting to the Transfer Agent
computer processable tapes of shareholder account transactions, and serving
as a source of information to customers concerning the Fund and
transactions with the Fund.  The Service Plan does not provide for accrued
but unpaid reimbursements to be carried over and reimbursed to Thornburg in
later years.

     The Fund has not paid reimbursements to Thornburg under the Service
Plan as of the date of this Statement of Additional Information.

Class C Distribution Plan

     The Fund has adopted a plan and agreement of distribution pursuant to
Rule 12b-1 under the Investment Company Act of 1940, applicable only to the
Class C shares of the Fund ("Distribution Plan").  The Distribution Plan
provides for the Fund's payment to the Fund's principal underwriter,
Thornburg Securities Corporation ("TSC") on a monthly basis of an annual
distribution fee of .75% of the average daily net assets attributable to
the Fund's Class C shares.

     The purpose of the Distribution Plan applicable to the Fund is to
compensate TSC for its services in promoting the sale of Class C shares of
the Fund.  TSC expects to pay compensation to dealers and others selling
Class C shares from amounts it receives under the Distribution Plan. TSC
also may incur additional distribution-related expenses in connection with
its promotion of Class C shares sales, including payment of additional
incentives to dealers, advertising and other promotional activities and the
hiring of other persons to promote the sale of shares.  Because the
Distribution Plan is a compensation type plan, TSC can earn a profit in any
year when Fund payments exceed TSC's actual expenses.  The Funds are not
liable for any expenses incurred by TSC in excess of the compensation it
received from the Fund.

     The Fund has not paid any amounts to TSC under the Distribution Plan
as of the date of this Statement of Additional Information.

                           PORTFOLIO TRANSACTIONS

     All orders for the purchase or sale of portfolio securities are placed
on behalf of the Fund by the Fund's investment adviser, Thornburg
Investment Management, Inc. (Thornburg) pursuant to its authority under the
Fund's investment advisory agreement.  Thornburg also is responsible for
the placement of transaction orders for other clients for whom it acts as
investment adviser.

     Thornburg places orders for transactions in portfolio securities for
the Fund in such a manner as, in the opinion of Thornburg, will offer the
best price and market for the execution of these transactions.  In
selecting broker dealers, subject to applicable legal requirements,
Thornburg considers various relevant factors, including, but not limited
to:  the size and type of the transaction; the nature and character of the
markets for the security to be purchases or sold; the execution efficiency,
settlement capability, and financial condition of the broker-dealer firm;
the broker-dealer's execution services rendered on a continuing basis; and
the reasonableness of any commissions; and arrangements for payment of Fund
expenses.  Generally commissions for foreign investments traded will be
higher than for U.S. investments and may not be subject to negotiation.

     Thornburg may execute the Fund's portfolio transactions with broker-
dealers who provide research and execution services to the Fund.  Such
services may include advice concerning the value of securities; the
availability of securities or the purchasers or sellers of securities;
furnishing analyses and reports concerning issuers, industries, securities,
economic factors and trends, portfolio strategy, and performance of
accounts; and effecting securities transactions and performing functions
incidental thereto (such as clearance and settlement).  The selection of
such broker-dealers is made by Thornburg based upon the quality of such
research and execution services provided.  The receipt of research from
broker-dealers who execute transactions on behalf of the Fund may be useful
to Thornburg in rendering investment management services to the Fund.  The
receipt of such research may not reduce Thornburg's normal independent
research activities; however, it may enable Thornburg to avoid the
additional expenses that could be incurred if Thornburg tried to develop
comparable information through its own efforts.

     Subject to applicable limitations of the federal securities laws,
broker-dealers may receive commissions for agency transactions that are in
excess of the amount of commissions charged by other broker-dealers in
recognition of their research and execution services.  In order to cause
the Fund to pay such higher commissions, Thornburg must determine in good
faith that such commissions are reasonable in relation to the value of the
brokerage and research services provided by the executing broker-dealers,
viewed in terms of a particular transaction or Thornburg's overall
responsibilities to the Fund.  In reaching this determination, Thornburg
will not attempt to place a specific dollar value on the brokerage and
research services provided, or to determine what portion of the
compensation would be related to those services.

     Thornburg is authorized to use research services provided by and to
place portfolio transactions with brokerage firms that have provided
assistance in the distribution of shares of the Funds to the extent
permitted by law. Thornburg may use research services provided by and place
agency transactions with Thornburg Securities Corporation (TSC) if the
commissions are fair, reasonable, and comparable to commissions charged by
non-affiliated, qualified brokerage firms for similar services.  Thornburg
may allocate brokerage transactions to broker-dealers who have entered into
arrangements with Thornburg under which the broker-dealer allocates a
portion of the commissions paid by the Fund toward payment of the Fund's
expenses, such as transfer agent fees or custodian fees.  The transaction
quality must, however, be comparable to those of other qualified broker-
dealers.

     Thornburg reserves the right to manage other investment companies and
investment accounts for other clients which may have investment objectives
similar to those of the Fund.  Subject to applicable laws and regulations,
Thornburg will attempt to allocate equitably portfolio transactions among
the Fund and the portfolios of its other clients purchasing securities
whenever decisions are made to purchase or sell securities by the Fund and
one or more of such other clients simultaneously.  In making such
allocations the main factors to be considered will be the respective
investment objectives of the Fund and the other clients, the size of
investment commitments generally held by the Fund and the other clients and
opinions of the persons responsible for recommending investments to the
Fund and such other clients.  While this procedure could have a detrimental
effect on the price or amount of the securities available to the Fund from
time to time, it is the opinion of the Fund's Trustees that the benefits
available from Thornburg's organization will outweigh any disadvantage that
may arise from exposure to simultaneous transactions.

     The Trustees of the Fund periodically review Thornburg's performance
of its responsibilities in connection with the placement of portfolio
transactions for the Fund.

     The Fund is a separate "series" or investment portfolio of Thornburg
Investment Trust, a Massachusetts business trust (the "Trust").  The
management of the Fund, including the general supervision of Thornburg's
performance of its duties under the Investment Advisory Agreement and
Administrative Services Agreements applicable to the Fund, is the
responsibility of the Trust's Trustees.  There are five Trustees, one of
whom is an "interested person" (as the term "interested" is defined in the
Investment Company Act of 1940) and four of whom are "disinterested"
persons. The names of Trustees and officers and their principal occupations
and affiliations during the past five years are set forth below, with the
Trustee who is an "interested person" of the Trust indicated by an
asterisk.


H. Garrett Thornburg, Jr.,* 54     Trustee;   Director, Chairman (since 1987)
                                   Chairman   and of Trustees Treasurer
                                              (since its inception
                                              in 1984) of Thornburg Limited
                                              Term Municipal Fund, Inc.;
                                              Chairman and Director of
                                              Thornburg Mortgage Advisory
                                              Corporation since its formation
                                              in 1989; Chairman and Director
                                              of Thornburg Mortgage Asset
                                              Corporation (real estate
                                              investment trust) since its
                                              formation in 1993; Executive
                                              Vice President of Daily Tax
                                              Free Income Fund, Inc. (mutual
                                              fund) since its formation in
                                              1982 and a Director from 1982
                                              to June 1993; Director and
                                              Treasurer of Thornburg since
                                              its formation in 1982 and
                                              President
                                              from 1982 to August 1997.

David A. Ater, 53                  Trustee    Principal in Ater & Ater
                                              Associates, Santa Fe, New
                                              Mexico (developer, planner and
                                              broker of residential and
                                              commercial real estate) since
                                              1990; owner, developer and
                                              broker for various real estate
                                              projects; Director of Thornburg
                                              Mortgage Asset Corporation
                                              (real estate investment trust)
                                              since 1994.

J. Burchenal Ault, 72              Trustee    Independent Fund Raising
                                              Counsel; Trustee, Woodrow
                                              Wilson International Center for
                                              Scholars; Director of Thornburg
                                              Limited Term Municipal Fund,
                                              Inc. since its formation in
                                              1984; Director of Farrar,
                                              Strauss & Giroux (publishers)
                                              since 1968.

Forrest S. Smith, 68               Trustee    Attorney in private practice
                                              and shareholder Catron, Catron
                                              & Sawtell (law firm), Santa Fe,
                                              New Mexico.

James W. Weyhrauch, 40             Trustee    Executive Vice President and
                                              Director, Nambe' Mills, Inc.
                                              (manufacturer), Santa Fe, New
                                              Mexico.

Brian J. McMahon, 44             President    President of Thornburg Limited
                       Assistant Secretary    Term Municipal Fund,Inc.
                                              since 1987; Managing Director
                                              of Thornburg since December
                                              1985, President of Thornburg
                                              since August 1997 and a Vice
                                              President from April 1984 to
                                              August 1997.

Steven J. Bohlin, 40        Vice President    Vice President of Thornburg
                                 Treasurer    Limited Term Municipal Fund,
                                              Inc. since 1988; a Managing
                                              Director and a Vice President
                                              of Thornburg.

Dawn B. Fischer, 52              Secretary    Secretary of Thornburg Limited
                       Assistant Treasurer    Term Municipal Fund, Inc. since
                                              its formation in 1984; Vice
                                              President, Daily Tax Free
                                              Income Fund, Inc. (Mutual Fund)
                                              since 1989; Managing Director
                                              of Thornburg since 1985 and a
                                              Vice President since January
                                              1984.

William Fries, 59           Vice President    Managing Director of Thornburg
                                              since 1995 and Vice President
                                              of Thornburg Limited Term
                                              Municipal Fund, Inc. since
                                              1995; Vice President
                                              of USAA Investment Management
                                              Company from 1982 to 1995.

Ken Ziesenheim, 45          Vice President    Managing Director of Thornburg
                                              since 1995; Vice President of
                                              Thornburg Limited Term
                                              Municipal Fund, Inc. since
                                              1995; President of Thornburg
                                              Securities Corporation since
                                              1995; Senior Vice President of
                                              Financial Services, Raymond
                                              James & Associates, Inc. from
                                              1991 to 1995.

George Strickland, 36       Vice President    Assistant Vice President of
                                              Thornburg Limited Term
                                              Municipal Fund, Inc. from
                                              1992 to 1998, and Vice
                                              President from 1998;  Associate
                                              of Thornburg since July 1991
                                              and a Managing Director
                                              commencing in 1996; Vice
                                              President of Thornburg since
                                              December 1995.

Leigh Moiola, 32            Assistant Vice    Assistant Vice President of
                                 President    Thornburg Limited Term
                                              Municipal Fund, Inc. from
                                              1997 to 1999, and Vice
                                              President since 1999; Vice
                                              President of Thornburg since
                                              1995 and Managing Director
                                              commencing in 1998.

Jack Lallement, 61          Assistant Vice    Assistance Vice President of
                                 President    Thornburg Limited Term
                                              Municipal Fund, Inc. since
                                              September 1997; Fund Accountant
                                              for Thornburg since March 1997;
                                              Chief Financial
                                              Officer/Controller
                                              for Zuni Rental, Inc.
                                              (equipment leasing and sales),
                                              Albuquerque, New Mexico from
                                              February 1995 to March 1997;
                                              Chief Financial
                                              Officer/Controller, Montgomery
                                              & Andrews, P.A. (law firm),
                                              Santa Fe, New Mexico from March
                                              1987 to August 1994.

Thomas Garcia, 29           Assistant Vice    Assistant Vice President of
                                 President    Thornburg Limited Term
                                              Municipal Fund, Inc. since
                                              1997; Fund Accountant for
                                              Thornburg from 1994 to 1998;
                                              Portfolio Analyst from 1998 to
                                              present; Vice President since
                                              February 2000; since 1994; BBA,
                                              University of New Mexico, 1993.

Van J. Billops, 33          Assistant Vice    Assistant Vice President of
                                 President    Thornburg Limited Term
                                              Municipal Fund, Inc. since
                                              1997; Fund Accountant for
                                              Thornburg since 1993.

Dale Van Scoyk, 52               Vice         Vice President of Thornburg
                                 President    Limited Term Municipal Fund,
                                              Inc. since 1999; Account
                                              Manager for Thornburg since
                                              1997; Vice President since
                                              1999, and Managing Director
                                              since 1999 National Account
                                              Manager for the Heartland Funds
                                              1993 - 1997.

Sophia Franco, 29           Assistant Vice    Assistant Vice President of
                                 President    Thornburg Limited Term
                                              Municipal Fund, Inc. since
                                              1998;  Associate of Thornburg
                                              since 1994.

Claiborne Booker, 38        Assistant Vice    Assistant Vice President of
                                 President    Thornburg Limited Term
                                              Municipal Fund, Inc. from
                                              1998 to 2000 and Vice President
                                              since June, 2000; Associate of
                                              Thornburg since 1998; Partner,
                                              Brinson Partners, Inc., 1994 -
                                              1997.

Kerry Lee, 33                    Vice         Assistant Vice President of
                                 President    Thornburg Limited Term
                                              Municipal Fund, Inc. from
                                              1998 to 1999, and vice
                                              President since 1999; Associate
                                              of Thornburg since 1995.

Richard Brooks, 53          Assistant Vice    Assistant Vice President of
                                 President    Thornburg Limited Term
                                              Municipal Fund, Inc. since
                                              1998; Associate of Thornburg
                                              since 1994.

Yvette Lucero, 28           Assistant Vice      Assistant Vice President of
                                 President      Thornburg Limited Term
                                                Municipal Fund, Inc. since
                                                1999; Associate of Thornburg
                                                since 1997; Sales Associate,
                                                Virginia Trading Post,
                                                1992-1997.

Christopher Ihlefeld, 30    Assistant Vice      Assistant Vice President of
                                 President      Thornburg Limited Term
                                                Municipal Fund, Inc. since
                                                1999; Associate of Thornburg
                                                since 1996; Student, College of
                                                Santa Fe 1996-1998; Student,
                                                Western New Mexico University,
                                                1995-1996; Student, Rollins
                                                College, 1991-1994.


     The business address of each person listed is 119 East Marcy Street,
Suite 202, Santa Fe, New Mexico 87501.  Mr. Thornburg is a Director of TSC,
Executive Vice President of Daily Tax-Free Income Fund, Inc., and a
Chairman and Treasurer of Thornburg Limited Term Municipal Fund, Inc.  Mr.
Ziesenheim and Ms. Fischer are president and secretary, respectively, of
TSC.

     The officers and Trustees affiliated with Thornburg serve without any
compensation from the Trust.  The Trust pays each Trustee who is not an
employee of Thornburg or an affiliated person an annual fee of $2,000 plus
$1,000 for each meeting of the Trustees attended by the Trustee.  In
addition, the Trust pays a $4,000 annual stipend to each member of the
audit committee, payable in quarterly installments, and reimburses all
Trustees for travel and out-of-pocket expenses incurred in connection with
attending those meetings. The Trustees have established one committee, the
audit committee, on which Messrs. Ater, Ault, Smith and Weyhrauch currently
serve.

      The Trust paid fees to the Trustees during the year ended September
30, 1999 as follows:

<TABLE>
                        Pension or
                         Retirement        Estimated      Total
           Aggregate     Benefits          Annual         Compensation
           Compensation  Accrued as        Benefits       from Trust and
           from          Part of           Upon           Fund Complex
Trustee    Trust         Fund Expenses     Retirement     Paid to Trustee
--------   ------------  -------------     -------------  ---------------
<S>             <C>           <C>               <C>            <C>
H. Garret
Thornburg, Jr.      0          0                 0              0

David A.       $7,000          0                 0         $7,000
Ater

J. Burchenal   $7,000          0                 0        $14,000
Ault

Forrest S.     $7,000          0                 0         $7,000
Smith

James W.       $6,000          0                 0         $6,000
Weyhrauch

The Trust does not pay retirement or pension benefits.

                              NET ASSET VALUE

     The Fund will calculate its net asset value at least once daily on
days when the New York Stock Exchange is open for trading, and more
frequently if deemed desirable by the Fund.  Net asset value will not be
calculated on New Year's Day, Washington's Birthday (on the third Monday in
February), Good Friday, Memorial Day (on the last Monday in May),
Independence Day, Labor Day, Thanksgiving Day, Christmas Day, on the
preceding Friday if any of the foregoing holidays falls on a Saturday, and
on the following Monday if any of the foregoing holidays falls on a Sunday.
Under the Investment Company Act of 1940, net asset value must be computed
at least once daily on each day (i) in which there is a sufficient degree
of trading in the Fund's portfolio securities that the current net asset
value of its shares might be materially affected by changes in the value of
such securities and (ii) on which an order for purchase or redemption of
its shares is received.

                               DISTRIBUTOR

     Pursuant to a Distribution Agreement with Thornburg Investment Trust,
Thornburg Securities Corporation ("TSC") acts as principal underwriter for
the Fund.  The Fund does not bear selling expenses except (i) those
involved in registering its shares with the Securities and Exchange
Commission and qualifying them or the Fund with state regulatory
authorities, and (ii) expenses paid under the Service and Distribution
Plans and which might be considered selling expenses.  Terms of
continuation, termination and assignment under the Distribution Agreement
are identical to those described above with regard to the Investment
Advisory Agreements, except that termination other than upon assignment
requires six months' notice.

     H. Garrett Thornburg, Jr., Treasurer, a Director and Chairman of the
Board of Thornburg Limited Term Municipal Fund, Inc. and President and a
Trustee of Thornburg Investment Trust, is also Director and controlling
stockholder of TSC.

ADDITIONAL INFORMATION RESPECTING PURCHASE AND REDEMPTION OF SHARES

     To the extent consistent with state and federal law, the Fund may make
payments of the redemption price either in cash or in kind.  The Trust has
elected to pay in cash all requests for redemption by any shareholder. They
may, however, limit such cash in respect to each shareholder during any 90-
day period to the lesser of $250,000 or 1% of the net asset value of a Fund
at the beginning of such period.  This election has been made pursuant to
Rule 18f-1 under the Investment Company Act of 1940 and is irrevocable
while the Rule is in effect unless the Securities and Exchange Commission,
by order, permits its withdrawal.  In the case of a redemption in kind,
securities delivered in payment for shares would be valued at the same
value assigned to them in computing the net asset value per share of the
Fund.  A shareholder receiving such securities would incur brokerage costs
when selling the securities.

                           INDEPENDENT AUDITORS

     PricewaterhouseCoopers LLP, 1177 Avenue of the Americas, New York, New
York 10036 is the independent auditor of the Fund.

<PAGE>
                                   PART C
                             OTHER INFORMATION

Items 22 and 23.  Financial Statements and Exhibits.

   (a)   Financial Statements

         None filed with this post-effective amendment.

   (b)   Exhibits

The following Exhibits are incorporated herein by reference to Registrant's
Registration Statement on Form N-1A as initially filed on June 12, 1987.

      (a)    Limited Term Trust, Agreement and Declaration of Trust,
             dated June 3, 1987.

      (6)    Not applicable.

      (e)    Form of Agency Agreement.

      (h)    Form of Subscription to Shares by Thornburg Management
             Company, Inc.

The following exhibits are incorporated herein by reference to Registrant's
pre-effective amendment No. 1 to its Registration Statement on Form N-1A as
filed on October 28, 1987:

      (a)    Thornburg Income Trust - First Amendment and Supplement
             to Agreement and Declaration of Trust, dated August 11,
             1987.

      (g)    Form of Custodian Agreement between Registrant and
             State Street Bank and Trust Company.  This exhibit
             supersedes the form of Custodian Agreement filed with
             the Registrant's initial Registration Statement on Form
             N-1A on June 12, 1987.

      (h)    Form of Transfer Agency Agreement between Registrant
             and State Street Bank and Trust Company.  This exhibit
             supersedes the form of Transfer Agency Agreement filed
             with the Registrant's initial Registration Statement on
             Form N-1A on June 12, 1987.

The following exhibits are incorporated herein by reference to Registrant's
post-effective amendment No. 1 to its Registration Statement on Form N-1A
as filed on March 3, 1988:

      (a)    Thornburg Income Trust-Second Amendment and Supplement
             to Agreement and Declaration of Trust, dated October 28,
             1987.

The following exhibits are incorporated herein by reference to Registrant's
post-effective amendment No. 7 to its Registration Statement on Form N-1A
as filed on April 19, 1991:

      (q)    Powers of Attorney from Messrs. Smith and Thornburg.

The following exhibits are incorporated herein by reference to Registrant's
post-effective amendment No. 9 to its Registration Statement on Form N-1A
as filed on March 3, 1992:

      (a)    Power of Attorney from J. Burchenal Ault

The following exhibits are incorporated herein by reference to the
Registrant's post-effective amendment No. 10 to its Registration Statement
on Form N-1A as filed on July 23, 1992:


      (h)    Form of Subscription to Shares

The following exhibits are incorporated herein by reference to the
Registrant's post-effective amendment No. 13 to its Registration Statement
on Form N-1A as filed on December 3, 1993:

      (a)    Thornburg Income Trust -- Third, Fourth, Fifth, Sixth
             and Seventh Amendments and Supplements to Agreement and
             Declaration of Trust

The following exhibits are incorporated herein by reference to the
Registrant's post-effective amendment No. 14 to its Registration Statement
on Form N-1A as filed on May 13, 1994:

      (9)    Power of attorney (B. McMahon)

The following exhibits are incorporated herein by reference to the
Registrant's post-effective amendment no. 17 to its Registration Statement
on Form N-1A as filed on July 27, 1994:

      (a)    Thornburg Income Trust Amended and Restated Designation
             of Series.

      (m.1)  Form of Plan and Agreement pursuant to Rule 12b-1
             (Class B Distribution Plan)

      (m.2)  Form of Plan and Agreement pursuant to Rule 12b-1
             (Class C Distribution Plan)

The following exhibits are incorporated herein by reference to the
Registrant's post-effective amendment no. 18 to its Registration Statement
on Form N-1A as filed on December 3, 1994:

      (m)    Form of Plan and Agreement pursuant to Rule 12b-1
             (Class B Service Plan)

      (m.1)  Form of Plan and Agreement pursuant to Rule 12b-1
             (Class C Service Plan)

The following exhibits are incorporated by reference to the Registrant's
post-effective amendment no. 20 to its Registration Statement on Form N-1A
as filed on July 5, 1995:

      (a.1)  Thornburg Income Trust - Ninth Amendment and
             Supplement to Agreement and Declaration of Trust

      (a.2)  Thornburg Income Trust - Tenth Amendment and
             Supplement to Agreement and Declaration of Trust

      (15.2) Form of Plan and Agreement Pursuant to Rule 12b-1
             (Class B Distribution Plan) - Thornburg Value Fund

      (q)    Power of attorney from David A. Ater

The following exhibit is incorporated by reference to the Registrant's
post-effective amendment no. 22 to its Registration Statement on Form N-1A
as filed on October 2, 1995:

      (a)    Thornburg Income Trust - Corrected Tenth Amendment
             and Supplement to Agreement and Declaration of Trust

   The following exhibit is incorporated by reference to the Registrant's
post-effective amendment no. 26 to its Registration Statement on Form N-1A
as filed on May 6, 1996:

      (a)    First Supplement to Amended and Restated Designation of Series

    The following exhibit is incorporated by reference to the Registrant's
post-effective amendment no. 27 to its Registration Statement on Form N-1A
as filed on August 30, 1996:

      (h)    Form of Administrative Services Agreement

The following exhibits are incorporated by reference from the Registrant's
post-effective amendment no. 29 to its Registration Statement on Form N-1A
as filed on March 14, 1997:

      (a.1)  Eleventh Amendment and Supplement to Agreement and Declaration
             of Trust

      (a.2)  Twelfth Amendment and Supplement to Agreement and Declaration
             of Trust

      (q)    Power of attorney from Brian J. McMahon

      (q)    Power of attorney from James W. Weyhrauch

The following exhibits are incorporated by reference from the Registrant's
post-effective amendment no. 32 to its Registration Statement on Form N-1A
as filed on February 17, 1998:

      (d)    Amended and Restated Investment Advisory Agreement

      (h)    Administrative Services Agreement (Class A and Class C shares)

      (h)    Administrative Services Agreement (Class I Shares)

      (r)    Memorandum of Reimbursement

      (m.1)  Plan and Agreement of Distribution Pursuant to Rule 12b-1
             (Service Plan - Classes A, C and I)

      (m.2)  Plan and Agreement of Distribution Pursuant to Rule 12b-1
             (Distribution Plan - Class C)

    The following exhibit is incorporated by reference from Registrant's
post-effective amendment no. 33 to its Registration Statement on Form N-1A
as filed on March 10, 1998:

      (a)    Thirteenth Amendment and Supplement to Agreement and
             Declaration of Trust

    The following exhibits are incorporated by reference from Registrant's
post-effective amendment no. 42 to its Registration Statement on Form N-1A
as filed on August 31, 2000:

     (b)    Amended By-Laws of Thornburg Investment Trust (June 1, 2000)

     (j.1)  Consent of counsel to be named in registration statement.

     (j.2)  Consent of independent auditors (PricewaterhouseCoopers, LLP)
            to be named in registration statement.

     (j.3)  Consent of independent auditors (McGladrey & Pullen, LLP)
            to be named in registration statement.

     (e)    Thornburg Investment Trust Amended Distribution Agreement
            (April 4, 2000)

     (m)    Amended Plan and Agreement of Distribution Pursuant to
            Rule 12b-1 (Distribution Plan - Class B)(April 4, 2000)

     (n.1)  Financial Data Schedule - Thornburg Intermediate Municipal Fund
            Class A (six months ended 3/31/00)

     (n.2)  Financial Data Schedule - Thornburg Intermediate Municipal Fund
            Class C (six months ended 3/31/00)

     (n.3)  Financial Data Schedule - Thornburg Intermediate Municipal Fund
            Class I (six months ended 3/31/00)

     (n.4)  Financial Data Schedule - Thornburg New Mexico Intermediate
            Municipal Fund Class A (six months ended 3/31/00)

     (n.5)  Financial Data Schedule - Thornburg New Mexico Intermediate
            Municipal Fund Class D (six months ended 3/31/00)

     (n.6)  Financial Data Schedule - Thornburg Florida Intermediate
            Municipal Fund Class A (six months ended 3/31/00)

     (n.7)  Financial Data Schedule - Thornburg New York Intermediate
            Municipal Fund Class A (year ended 6/30/00)

     (n.8)  Financial Data Schedule - Thornburg Limited Term U.S.
            Government Fund Class A (six months ended 3/31/00)

     (n.9)  Financial Data Schedule - Thornburg Limited Term U.S.
            Government Fund Class C (six months ended 3/31/00)

     (n.10) Financial Data Schedule - Thornburg Limited Term U.S.
            Government Fund Class I (six months ended 3/31/00)

     (n.11) Financial Data Schedule - Thornburg Limited Term Income Fund
            Class A (six months ended 3/31/00)

     (n.12) Financial Data Schedule - Thornburg Limited Term Income Fund
            Class C (six months ended 3/31/00)

     (n.13) Financial Data Schedule - Thornburg Limited Term Income Fund
            Class I (six months ended 3/31/00)

     (n.14) Financial Data Schedule - Thornburg Value Fund Class A
            (six months ended 3/31/00)

     (n.15) Financial Data Schedule - Thornburg Value Fund Class C
            (six months ended 3/31/00)

     (n.16) Financial Data Schedule - Thornburg Value Fund Class I
            (six months ended 3/31/00)

     (n.17) Financial Data Schedule - Thornburg Global Value Fund Class A
            (six months ended 3/31/00)

     (n.18) Financial Data Schedule - Thornburg Global Value Fund Class C
            (six months ended 3/31/00)

     (o)    Thornburg Investment Trust Plan for Multiple Class Distribution
            July 1, 1999 (as revised December 6, 1999)

     (p.1)  Thornburg Investment Trust Code of Ethics (revised June 1,
2000)

     (p.2)  Thornburg Investment Management, Inc./Thornburg Securities
            Corporation Code of Ethics (revised December 1999 and April
2000)

The following exhibits are filed herewith:

      (a)   Fourteenth Amendment and Supplement to Agreement and
            Declaration of Trust

      (j.1) Consent of Counsel to be named in registration statement

      (j.2) Consent of Independent Auditors

Item 24.  Persons Controlled By or Under Common Control With Registrant.

          Not applicable.

Item 25.   Indemnification.

      (1)   Please see Section 10.2 of the Agreement and  Declaration of
Trust filed as Exhibit a.  Section 10.2 generally provides that each of the
Trust's officers and Trustees will be indemnified by the Trust against
liability and expenses in connection with his having been a Trustee or
officer unless it is determined that the individual is liable by reason of
willful misfeasance, bad faith, gross negligence or reckless disregard of
the duties involved in the conduct of his office, or if the individual did
not act in good faith in the reasonable belief that the action was in the
Trust's best interest.

      (2)   Please see Section 8 of the Distribution Agreement filed as
Exhibit (e).  Section 7 generally provides that the Trust will indemnify
Thornburg Securities Corporation (TSC), its officers and directors, and its
controlling persons against liabilities and expenses incurred because of
any alleged untrue statement of material fact contained in the Registration
Statement, Prospectus or annual or interim reports to shareholders, or any
alleged omission to state a material fact required to be stated therein, or
necessary to make the statements therein, not misleading, except where (i)
the untrue statement or omission arises from information furnished by TSC,
or (ii) to the extent the prospective  indemnitee is an officer, trustee or
controlling person  of the Trust, the indemnification is against public
policy as expressed in the 1933 Act, or (iii) the liability or expense
arises from TSC's willful misfeasance, bad faith, gross negligence,
reckless performance of duties, or reckless disregard of its obligations
and duties under the Distribution Agreement. Further, TSC agrees to
indemnify the Trust, its officers and trustees, and its controlling persons
in certain circumstances.

      (3)   The directors and officers of Thornburg Investment Management,
Inc. (Thornburg) are insured, and it is intended that the Trustees and
officers of the Trust will become insured, under a joint professional and
directors and officers liability policy.  The described individuals are
referred to as the "insureds."  The policy covers amounts which the
insureds become legally obligated to pay by reason of the act, error,
omission, misstatement, misleading statement or neglect or breach of duty
in the performance of their duties as directors, trustees and officers.  In
addition, the policy covers Thornburg, and is proposed to cover the
Registrant, to the extent that they have legally indemnified the insureds
for amounts incurred by the insureds as described in the preceding
sentence.  The coverage excludes amounts that the insureds become obligated
to pay by reason of conduct which constitutes willful misfeasance, bad
faith, gross negligence or reckless disregard of the insured's duties. The
application of the foregoing provisions is limited by the following
undertaking set forth in the rules promulgated by the Securities and
Exchange Commission:

          Insofar as indemnification for liabilities arising
          under the Securities Act of 1933 may be permitted to
          Trustees, officers and controlling persons of the
          Registrant pursuant to the foregoing provisions, or
          otherwise, the Registrant has been advised that in the
          opinion of the Securities and Exchange Commission such
          indemnification is against public policies expressed
          in such Act and that if a claim for indemnification
          against such liabilities other than the payment by the
          Registrant of expenses incurred or paid by a Trustee,
          officer or controlling person of the Registrant in the
          successful defense of any action, suit or proceeding)
          is asserted by such Trustee, officer or controlling
          person in connection with the securities being
          registered, the Registrant will, unless in the opinion
          of its counsel the matter has been settled by
          controlling precedent, submit to a court of
          appropriate jurisdiction the question whether such
          indemnification by it is against public policy as
          expressed in such Act and will be governed by the
          final adjudication of such issue.

Item 26.   Business and Other Connections of the Investment Adviser.   See
"MANAGEMENT" in the Statement of Additional Information.

Item 27.   Principal Underwriters.

     (a)  The principal underwriter for the Registrant will be Thornburg
Securities Corporation ("TSC").  TSC is registered as a broker-dealer under
the Securities Exchange Act of 1934 and is a member of the National
Association of Securities Dealers, Inc.  TSC was formed for the purpose of
distributing the shares of the Registrant's series and other registered
investment companies sponsored by its affiliates, and does not currently
engage in the general securities business.

     (b)  The address of each of the directors and officers of TSC is 119
East Marcy Street, Suite 202, Santa Fe, New Mexico 87501.

                              Positions and            Positions and
                              Offices                  Offices
Name                          with TSC                 with Registrant
----------------------        --------------           --------------------
H. Garrett Thornburg, Jr.     Director                 Trustee; President
Kenneth Ziesenheim            President                Vice President
Dawn B. Fischer               Secretary                Secretary and
                                                       Assistant Treasurer

     (c)  Not applicable.

Item 28.  Location  of Accounts and Records.

All accounts, books and other documents required to be maintained by
Section 31(a) of the Investment Company Act of 1940 and the rules
thereunder are maintained at the offices of State Street Bank and Trust
Company, at 470 Atlantic Avenue, Fifth Floor, Boston, Massachusetts 02210.

Item 29.  Management Services.

The Registrant and Thornburg Investment Management, Inc. ("Thornburg") have
agreed that Thornburg will perform for the Registrant certain telephone
answering services previously performed by the Registrant's transfer agent,
National Financial Data Services, Inc. ("NFDS").  These telephone services
include answering telephone calls placed to the Registrant or its transfer
agent by shareholders, securities dealers and others through the
Registrant's toll free number, and responding to those telephone calls by
answering questions, effecting certain shareholder transactions described
in the Registrant's current prospectuses, and performing such other,
similar functions as the Registrant may reasonably prescribe from time to
time.  The Registrant will pay one dollar for each telephone call, which
was the charge previously imposed by the Registrant's transfer agent for
this service.  The Registrant's transfer agent will no longer charge for
this service.  The Registrant understands that (i) the telephone answering
service provided by Thornburg will be superior to that previously provided
by the transfer agent because Thornburg will devote greater attention to
training the telephone personnel, and those personnel will have immediate
access to the Registrant's and Thornburg's management, (ii) the per-call
charge imposed upon the Registrant for this service will be no greater than
that charged by the Registrant's transfer agent, and (iii) Thornburg will
not receive any profit from providing this service.  The Registrant will
reimburse Thornburg for a portion of the depreciation on certain telephone
answering equipment purchased by Thornburg to render the described
services.  The Registrant paid $73,536.38, $20,906 and $4,246 to Thornburg
under the described arrangements in each of the three most recent fiscal
years ended September 30, 1997, 1998 and 1999. It is not believed that
these arrangements constitute a management-related services agreement.

Item 30.  Undertakings.
The Registrant undertakes, if requested to do so by the holders of at least
10% of its outstanding shares to call a meeting of shareholders for the
purpose of voting upon the question of removal of a trustee or trustees,
and to assist in communications with other shareholders as required by
Section 16(c) of the Investment Company Act of 1940, as amended.  The
Registrant undertakes, within four to six months from the effective date of
this amendment to the Registration Statement in respect of Thornburg Growth
Fund, to file a post-effective amendment with financial statements for
Thornburg Growth Fund, which need not be certified.


<PAGE>
                                SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940 the Registrant has duly caused this
Registration Statement to be signed on its behalf by the undersigned,
thereto duly authorized, in the City of Santa Fe, and State of New Mexico
on the 12th day of October, 2000.

THORNBURG INVESTMENT TRUST
Registrant

By               *
     ------------------------------------
     Brian J. McMahon, President

Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in
the capacities and on the date indicated.

                 *
------------------------------------------
Brian J. McMahon, President and
principal executive officer

                 *
------------------------------------------
H. Garrett Thornburg, Jr., Trustee,
Chairman of Trustees, Treasurer

                 *
------------------------------------------
J. Burchenal Ault, Trustee

                 *
------------------------------------------
David A. Ater, Trustee

                 *
------------------------------------------
Forrest S. Smith, Trustee

                 *
------------------------------------------
James W. Weyhrauch, Trustee



* By:          /s/
     --------------------------------
      Charles W.N. Thompson, Jr.
      Attorney-In-Fact

<PAGE>
                             INDEX TO EXHIBITS
Exhibit
Number    Exhibit
-------   -------

      (a)   Fourteenth Amendment and Supplement to Agreement and
            Declaration of Trust

      (j.1) Consent of counsel to be named in registration statement

      (j.2) Consent of independent auditors

<PAGE>
                                 EXHIBIT (a)
                         THORNBURG INVESTMENT TRUST
                   FOURTEENTH AMENDMENT AND SUPPLEMENT TO
                     AGREEMENT AND DECLARATION OF TRUST

     THIS FOURTEENTH AMENDMENT AND SUPPLEMENT is made by H. Garrett
Thornburg, Jr., David A. Ater, J. Burchenal Ault, Forrest S. Smith and James
W. Weyhrauch (the "Trustees").

     The Trust was formed on June 3, 1987 by an Agreement and Declaration of
Trust - Limited Term Trust dated June 3, 1987.  Section 3.1 permits the
creation of new series of shares in addition to the series established and
designated in Section 3.2.

     Accordingly, by execution of this Amendment and Supplement, the Trustees
effect the following amendments to the Agreement and Declaration of Trust.

                           Creation of New Series
                           ----------------------

     The Trustees establish a new series of shares designated "Thornburg
Growth Fund" effective September 15, 2000.  The new series will have the
relative rights and preferences described in Section 3.2 of the Agreement and
Declaration of Trust.

     The Trustees further establish and designate five classes of shares of
Thornburg Growth Fund, each having an unlimited number of shares:  the Class
A Shares, the Class B Shares, the Class C Shares, the Class D Shares, and the
Class I Shares, respectively.  Additional classes of shares of the Fund may
be established and designated by the Trustees from time to time by supplement
to this Amendment and Supplement.

     Shares of each Class so created will represent interests in the same
assets of the Fund, and will be identical in all respects except as described
below:

     (a)     fees will be charged to each Class under the Class's Rule 12b-1
distribution plans, if any, to the extent that expenses are allocable to that
Class;

     (b)     a service fee will be charged to each Class based on a
percentage of the average daily net asset value of that Class, which fee
shall be primarily intended to reimburse the adviser for expenditures to
obtain shareholder services; and a distribution fee will be charged to each
of Class B Shares, Class C Shares and Class D Shares under separate
distribution plans;

     (c)     a higher transfer agency fee may be charged to Class B Shares,
Class C Shares and Class D Shares, and a different transfer agency fee may be
charged to Class I Shares, than is imposed on Class A Shares;

     (d)     shareholders of each Class will have exclusive voting rights
with respect to any Rule 12b-1 plans applicable to that Class of shares;

     (e)     Class B Shares, Class C Shares, Class D Shares and Class I
Shares may have conversion features providing for conversion to Class A
Shares, and the terms and periods for conversion for each Class may differ,
as the Trustees may from time to time specify by resolution;

     (f)     to the extent identifiable as being attributable to a specific
Class, the following expenses may be allocated to the Class:  (i) printing
and postage expenses related to preparing and distributing materials such as
shareholder reports, prospectuses and proxy materials to current
shareholders; (ii) blue sky fees and costs attributable to registration,
qualification or exemption of the Class's shares, (iii) federal registration
fees; (iv) administrative expense required to support the shareholders of a
specific Class; and (v) litigation or other legal expenses relating solely to
one Class of shares;

     (g)     consistent with the foregoing, fees and expenses chargeable to a
Class, and conversion and reinvestment rights of shares of the Class, shall
be from time to time established by resolution of the Trustees; and

     (h)     fees and expenses of a Class shall first be charged against the
pro rata portion of the income of the Fund allocable to shares of that Class,
and, to the extent necessary, fees and expenses will be charged to that
portion of the net assets of the Fund allocable to that Class.

Other than as specified above, the various Classes of the Fund shall have the
rights and preferences as described in Article III of the Agreement and
Declaration of Trust.

     The Trustees effect these amendments as of September 15, 2000, and
direct the Trust's president to file this Amendment and Supplement in the
appropriate governmental offices.


                               -----------------------------------
                               H. Garrett Thornburg, Jr.


                               -----------------------------------
                               David A. Ater


                               -----------------------------------
                               J. Burchenal Ault


                               -----------------------------------
                               Forrest S. Smith


                               -----------------------------------
                               James W. Weyhrauch




                                EXHIBIT j.1
<PAGE>

   WHITE                                      Attorneys and Counselors at Law
KOCH, KELLY                      John F. McCarthy, Jr.  Julie A. Wittenberger
     &                               Benjamin Phillips           Suzanne Odom
   McCARTHY                        David F. Cunningham
A Professional Association          Albert V. Gonzales
                                            Janet Clow
                                       Kevin V. Reilly        Special Counsel
                                  C.W.N. Thompson, Jr.          Paul L. Bloom
                                      M. Karen Kilgore
                                      Sandra J. Brinck
                                         Aaron J. Wolf
                                         Mary E. Walta
                                       Rebecca Dempsey
                                        John M. Hickey

                                   October 12, 2000


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.  20549             VIA EDGAR FILING

     Re:  Thornburg Investment Trust
     Registration Number Under the Securities Act of 1933:  033-14905
     Registration Number Under the Investment Company Act of 1940:  811-05201

Ladies and Gentlemen:

     We hereby consent to the references made to this firm in the post-
effective amendment no. 43 to the registration statement of Thornburg
Investment Trust and the prospectuses which are a part of that registration
statement.  In giving this consent, we do not admit that we are in the
category of persons whose consent is required under Section 7 of the
Securities Act of 1933.

                              Very truly yours,

                              /S/ Charles W.N. Thompson, Jr.

                              CHARLES W. N. THOMPSON, JR.












433 Paseo de Peralta        Post Office Box 787    Santa Fe, NM  87504-0787
Phone (505) 982-4374   Fax (505) 983-0350; 984-8631      e-mail [email protected]

<PAGE>
                               EXHIBIT j.2

                      CONSENT OF INDEPENDENT AUDITORS

We hereby consent to the reference to us under the heading "Independent
Auditors" in this Registration Statement on Form N-1A.


/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP


New York, New York
October 13, 2000














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