THORNBURG INVESTMENT TRUST
N-30D, 1999-11-30
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Thornburg Florida Intermediate Municipal Fund
All data as of 9.30.99
Fund Facts
Thornburg Florida Intermediate Municipal Fund
         A Shares
SEC Yield ...............................................        3.78%
Taxable Equivalent Yields ...............................        6.46%
NAV .....................................................   $   11.79
Max. Offering Price .....................................   $   12.03

Total returns
(Annual Average - After Subtracting Maximum Sales Charge)

One Year (2.33)%
Five Year ...............................................        4.90%
Since Inception .........................................        4.14%
Inception Date ..........................................   (2.1.1994)

The taxable  equivalent  yield assumes a 39.6%  marginal  federal tax rate and a
0.2% intangible tax.
The  investment  return and  principal  value of an  investment in the fund will
fluctuate so that, when redeemed, an investor's shares may be worth more or less
than their original  cost.  Maximum sales charge of the Fund's Class A Shares is
2.00%.  The Fund's Class C Shares were  converted to Class A Shares on April 30,
1996. The data quoted  represent past  performance and may not be construed as a
guarantee of future results.

Letter to shareholders


Dear Fellow Shareholder,
The fiscal year ending  September  30, 1999  continued a period of change in the
bond market.  After  falling to their lowest  levels in several years in October
1998, interest rates have risen steadily throughout 1999. The net asset value of
the A shares  decreased 58 cents per share to $11.79 over the year.  If you were
with us for the entire period, you received dividends of 54.1 cents per share.
If you reinvest your dividends, you received 55.2 cents per share.
Your fund is a managed bond portfolio.  Its performance  over the last year is a
total of all the stories of the  individual  bonds in our  portfolio  plus a few
that we traded during the period.  One typical story  pertains to our investment
in $1,000,000 of the Hillsborough  County IDA bonds for University  Hospital due
8/15/2006.  This is a AAA-rated,  insured bond.  The graph on this page compares
the price change of Thornburg Florida Intermediate Municipal Fund with the price
change in the Hillsborough  County bond. Note: This graph considers market price
changes  only,  not total  return.  On  September  30,  1998 this bond was worth
109.475% of its $1 million  maturity  amount at a then market yield of 4.08%. On
September 30, 1999 an increase in its market yield to 4.75%  decreased the price
of the bond to 104.35% of its maturity value. In general,  the price  volatility
of your fund was almost exactly equal to that of the single  Hillsborough County
bond.














Nothing has happened in the last several years of fluctuating  interest rates to
change the ultimate  maturity value of this bond, or most of the other bonds you
own through your investment in this fund.  What has changed?  The interim market
prices of these bonds moved lower  through  most of 1999,  with the shortest and
highest quality bonds performing best. If interest rates drop in the future, the
longest bonds in the portfolio will perform best.

Your portfolio includes over 50 bonds from various Florida bond issuers,  85% of
which  are rated A or better  by one of the  major  rating  agencies.  Your bond
portfolio in Thornburg Florida Intermediate Municipal Fund is laddered to give a
dollar weighted  average maturity of  approximately  8.5 years.  This is shorter
than the 10-year  maximum  average  maturity for your fund.  Percentages  of the
portfolio maturing in the coming years are summarized below:

        % of portfolio          Cumulative %
        maturing within      maturing by end of

         2 years = 10%          year 2 = 10%
    2 to 4 years = 8%           year 4 = 18%
    4 to 6 years = 16%          year 6 = 34%
    6 to 8 years = 16%          year 8 = 50%
   8 to 10 years = 10%          year 10 = 60%
  10 to 12 years = 12%          year 12 = 72%
  12 to 14 years = 12%          year 14 = 84%
  14 to 16 years = 13%          year 16 = 97%
  16 to 18 years = 2%           year 18 = 99%
   Over 18 years = 1%

Over the years,  our practice of laddering a diversified  portfolio of short and
intermediate  maturity bonds has allowed your fund to consistently  perform well
in varying interest rate environments. Your fund has earned Morningstar's 4-star
overall rating* for risk adjusted  performance.  We would like to attribute this
to capable execution of a sensible  investment strategy over time. Thank you for
investing in Thornburg Florida Intermediate Municipal Fund.
Sincerely,


Brian J. McMahon  George T. Strickland
Portfolio Manager Portfolio Manager

*Morningstar  proprietary rating reflects historical risk adjusted  performances
as of 9/30/99.  Ratings are subject to change every  month.  Funds with at least
three years of performance  history are assigned  ratings from one star (lowest)
to five stars  (highest).  Morningstar  overall  ratings are calculated from the
funds' three-, five-, and ten year average annual returns and a risk factor that
reflects fund performance  relative to three month Treasury bill returns. 10% of
the funds in an  investment  category  receive five stars and 22.5% receive four
stars.  THFLX is ranked 4 stars for the 3 year period and 4 stars for the 5 year
period.  At 9/30/99,  there were 1,611 bond funds with 3-year  ratings and 1,241
with  5-year  ratings  in  Morningstar's  Municipal  Single-State   Intermediate
category. Past performance cannot guarantee future results.

Statement of assets and liabilities
ASSETS

Investments at value (cost $31,328,492) ...................   $31,437,691
Cash ......................................................        71,965
Receivable for investments sold ...........................        41,947
Interest receivable .......................................       534,085
Receivable for fund shares sold ...........................         3,134
Prepaid expenses and other assets .........................           522
         Total Assets .....................................    32,089,344

LIABILITIES

Payable for securities purchased ..........................     1,687,065
Payable for fund shares redeemed ..........................        53,185
Accounts payable and accrued expenses .....................        56,799
Payable to investment advisor (Note 3) ....................        13,495
Dividends payable .........................................        57,712
         Total Liabilities ................................     1,868,256

NET ASSETS ................................................   $30,221,088

NET ASSET VALUE:

Class A Shares:
Net asset value and redemption price per share ($30,221,088
applicable to 2,563,502 shares of beneficial interest
outstanding - Note 4) .....................................   $     11.79

Maximum sales charge, 2.00% of offering
price (2.04% of net asset value per share) ................          0.24
Maximum Offering Price Per Share ..........................   $     12.03

See notes to financial statements .........................

Statement of operations

INVESTMENT INCOME:
Interest income (net of premium amortized
of $82,305) .................................................   $ 1,647,260

EXPENSES:
Investment advisory fees (Note 3) ...........................       151,487
Administration fees (Note 3) ................................        37,871
Service fees (Note 3) .......................................        74,228
Transfer agent fees .........................................        20,655
Custodian fees ..............................................        32,257
Professional fees ...........................................         2,501
Accounting fees .............................................         2,698
Trustee fees ................................................           400
Other expenses ..............................................         3,497

         Total Expenses .....................................       325,594

Less:
         Expenses reimbursed by investment advisor (Note 3) .       (24,439)

         Net Expenses .......................................       301,155

         Net Investment Income ..............................     1,346,105

REALIZED AND UNREALIZED GAIN
(LOSS) ON INVESTMENTS (Note 5)
Net realized gain (loss) on investments sold ................      (215,943)
Increase (decrease) in unrealized appreciation of investments    (1,257,165)

         Net Realized and Unrealized
         Gain (Loss) on Investments .........................    (1,473,108)

         Net Increase (Decrease) in Net Assets Resulting
         From Operations ....................................   $  (127,003)

See notes to financial statements ...........................


<TABLE>
<CAPTION>
Statements of changes in net assets
                                                                            Year Ended        Year Ended
                                                                       September 30, 1999  September 30, 1998
INCREASE (DECREASE) IN NET ASSETS FROM:
OPERATIONS:
<S>                                                                        <C>             <C>
Net investment income ..................................................   $  1,346,105    $  1,200,246
Net realized gain (loss) on investments sold ...........................       (215,943)            829
Increase (decrease) in unrealized appreciation of investments ..........     (1,257,165)        521,930

         Net Increase (Decrease) in Net Assets Resulting from Operations       (127,003)      1,723,005

DIVIDENDS TO SHAREHOLDERS:
From net investment income
                  Class A Shares .......................................     (1,346,105)     (1,200,246)

FUND SHARE TRANSACTIONS (Note 4):
Class A Shares .........................................................      3,603,645       2,904,944

         Net Increase in Net Assets ....................................      2,130,537       3,427,703

NET ASSETS:
         Beginning of year .............................................     28,090,551      24,662,848

                  End of year ..........................................   $ 30,221,088    $ 28,090,551

See notes to financial statements ......................................
</TABLE>


Notes to financial statements
Note 1 - Organization
Thornburg Florida Intermediate Municipal Fund (the "Fund"), is a non-diversified
series of Thornburg Investment Trust (the "Trust").  The Trust is organized as a
Massachusetts business trust under a Declaration of Trust dated June 3, 1987 and
is registered as a diversified, open-end management investment company under the
Investment Company Act of 1940, as amended. The Trust is currently issuing seven
series  of shares  of  beneficial  interest  in  addition  to those of the Fund:
Thornburg  New  Mexico   Intermediate   Municipal   Fund,   Thornburg  New  York
Intermediate  Municipal Fund, Thornburg  Intermediate  Municipal Fund, Thornburg
Limited Term U.S. Government Fund, Thornburg Limited Term Income Fund, Thornburg
Value Fund, and Thornburg  Global Value Fund.  Each series is considered to be a
separate entity for financial reporting and tax purposes.  The Fund's investment
objective  is to obtain as high a level of current  income  exempt from  Federal
income tax as is consistent with the preservation of capital. The Fund currently
offers only one class of shares of beneficial interest, Class A shares.

Note 2 - Significant  Accounting Policies Significant accounting policies of the
Fund are as follows:
Valuation of Investments:  In determining net asset value,  the Fund utilizes an
independent pricing service approved by the Trustees. Debt investment securities
have a primary market over the counter and are valued on the basis of valuations
furnished  by  the  pricing  service.   The  pricing  service  values  portfolio
securities  at quoted  bid prices at 4:00pm  EST or the yield  equivalents  when
quotations are not readily  available.  Securities for which  quotations are not
readily  available are valued at fair value as determined by the pricing service
using  methods  which  include  consideration  of yields or prices of  municipal
obligations of comparable quality, type of issue, coupon,  maturity, and rating;
indications  as to  value  from  dealers  and  general  market  conditions.  The
valuation  procedures used by the pricing  service and the portfolio  valuations
received by the Fund are reviewed by the officers of the Trust under the general
supervision of the Trustees.  Short-term obligations having remaining maturities
of 60 days or less are  valued at  amortized  cost,  which  approximates  market
value.  Federal  Income  Taxes:  It is the policy of the Fund to comply with the
provisions of the Internal  Revenue Code  applicable  to  "regulated  investment
companies"  and to distribute  all of its taxable (if any) and tax exempt income
to its shareholders.  Therefore no provision for Federal income tax is required.
Dividends  paid by the Fund for the year  ended  September  30,  1999  represent
exempt interest dividends which are excludable by shareholders from gross income
for Federal income tax purposes. Net realized capital losses are carried forward
to  offset  realized   capital  gains  in  future  years.  To  the  extent  such
carryforwards are used, no capital  distributions will be made.  When-Issued and
Delayed  Delivery  Transactions:  The Fund may engage in  when-issued or delayed
delivery transactions.  To the extent the Fund engages in such transactions,  it
will do so for the purpose of acquiring portfolio securities consistent with its
investment  objectives  and not for the  purpose of  investment  leverage  or to
speculate on interest rate  changes.  At the time the Fund makes a commitment to
purchase a security on a when-issued  basis,  it will record the transaction and
reflect  the value in  determining  its net asset  value.  When  effecting  such
transactions, assets of the Fund of an amount sufficient to make payment for the
portfolio securities to be purchased will be segregated on the Fund's records on
the trade date.  Securities purchased on a when-issued or delayed delivery basis
do not earn interest until the settlement date. Dividends: Net investment income
of the Fund is  declared  daily as a  dividend  on shares for which the Fund has
received  payment.  Dividends are paid monthly and are  reinvested in additional
shares of the Fund at net asset  value per share at the close of business on the
dividend payment date, or at the shareholder's option, paid in cash. Net capital
gains,  to  the  extent  available,  will  be  distributed  annually.   General:
Securities transactions are accounted for on a trade date basis. Interest income
is accrued as earned.  Premiums  and  original  issue  discounts  on  securities
purchased are amortized  over the life of the  respective  securities.  Realized
gains and losses from the sale of securities are recorded on an identified  cost
basis. Use of Estimates: The preparation of financial statements,  in conformity
with  generally  accepted  accounting  principles,  requires  management to make
estimates  and  assumptions  that  affect  the  reported  amounts  of assets and
liabilities and the disclosure of contingent  assets and liabilities at the date
of the financial  statements and the reported amounts of increases and decreases
in net assets from operations during the reporting period.  Actual results could
differ from those estimates.

Note 3 - Investment Advisory Fee and Other Transactions With Affiliates
Pursuant to an investment advisory agreement,  Thornburg Investment  Management,
Inc. (the "Adviser") serves as the investment  adviser and performs services for
which  the  fees  are  payable  at the end of each  month.  For the  year  ended
September 30, 1999,  these fees were payable at annual rates ranging from 1/2 of
1% to 11/40 of 1% of the average  daily net assets of the Fund  depending on the
Fund's asset size. The Fund also has an Administrative  Services  Agreement with
the Adviser,  whereby the Adviser will perform certain  administrative  services
for the shareholders of each class of the Fund's shares, and for which fees will
be payable at an annual rate of up to 1/8 of 1% of the average  daily net assets
attributable to each class of shares. For the year ended September 30, 1999, the
Adviser voluntarily  reimbursed certain operating expenses amounting to $24,439.
The Fund has an  underwriting  agreement with Thornburg  Securities  Corporation
(the "Distributor"),  which acts as the Distributor of Fund shares. For the year
ended September 30, 1999, the Distributor earned commissions  aggregating $9,028
from the sale of Class A shares. Pursuant to a Service Plan, under Rule 12b-1 of
the  Investment  Company Act of 1940,  the Fund may  reimburse to the Adviser an
amount not to exceed .25 of 1% per annum of the average net assets  attributable
to each  class of  shares  of the  Fund  for  payments  made by the  Adviser  to
securities   dealers  and  other   financial   institutions  to  obtain  various
shareholder  related  services.  The  Adviser  may  pay  out  of its  own  funds
additional expenses for distribution of the Fund's shares.  Certain officers and
trustees  of the Trust are also  officers  and/or  directors  of the Adviser and
Distributor.  The compensation of unaffilliated  trustees is borne by the Trust.
Note 4 - Shares of  Beneficial  Interest  At  September  30,  1999 there were an
unlimited  number of shares  of  beneficial  interest  authorized,  and  capital
paid-in aggregated  $30,479,242.  Transactions in shares of beneficial  interest
were as follows:
<TABLE>
<CAPTION>

                                          Year Ended September 30, 1999      Year Ended September 30, 1998
<S>                                          <C>         <C>              <C>            <C>
Class A Shares .......................        Shares          Amount          Shares        Amount
Shares sold ..........................        773,239    $  9,449,540       1,756,020    $ 21,482,186
Shares issued to shareholders in
         reinvestment of distributions         48,560         589,073          37,405         457,724
Shares repurchased ...................       (529,473)     (6,434,968)     (1,554,599)    (19,034,966)

Net Increase .........................        292,326    $  3,603,645         238,826    $  2,904,944
</TABLE>


Note 5 - Securities Transactions
For the  year  ended  September  30,  1999,  the  Fund  had  purchase  and  sale
transactions  (excluding short-term  securities) of $14,227,567 and $11,069,010,
respectively.  The cost of  investments  for  Federal  Income  tax  purposes  is
$31,328,492.  At September 30, 1999, net unrealized  appreciation of investments
was $109,199, resulting from $551,467 gross unrealized appreciation and $442,268
gross unrealized  depreciation.  Accumulated net realized losses from securities
transactions  included in net assets at September 30, 1999 aggregated  $367,353.
For Federal income tax purposes,  the Fund had deferred  capital losses occuring
subsequent  to October 31, 1998 of $210,000  and capital loss  carryforwards  of
$153,000. The carryforwards expire in varying amounts through 2007.

Financial highlights
<TABLE>
<CAPTION>
                                                                                   Year Ended September 30,
                                                                 1999           1998           1997          1996           1995
Class A Shares:
<S>                                                         <C>             <C>              <C>          <C>            <C>
Net asset value, beginning of year ...................      $    12.37      $   12.14        $ 11.88      $   11.83      $    11.54


Income from investment operations:
                  Net investment income ..............            0.54           0.56           0.56           0.57           0.63
                  Net realized and unrealized
                  gain (loss) on investments(0.58) ...            0.23           0.26           0.05           0.29

Total from investment operations .....................           (0.04)          0.79           0.82           0.62           0.92
Less dividends from:
                  Net investment income ..............           (0.54)         (0.56)         (0.56)         (0.57)         (0.63)

Change in net asset value ............................           (0.58)          0.23           0.26           0.05           0.29

Net asset value, end of year .........................   $       11.79      $   12.37     $    12.14      $   11.88      $   11.83

Total return (a) .....................................           (0.36%)         6.62%          7.04%          5.37%          8.22%

Ratios/Supplemental Data Ratios to average net assets:
                  Net investment income ..............            4.44%          4.54%          4.65%          4.80%          5.41%
                  Expenses, after expense reductions .            0.99%          0.98%          0.83%          0.61%          0.38%
                  Expenses, before expense reductions             1.08%          1.11%          1.13%          1.34%          1.44%

Portfolio turnover rate ..............................           35.91%         70.81%         51.48%         77.12%         89.60%

Net assets at end of year (000) ......................    $     30,221     $   28,091     $   24,663     $    19,501    $    14,822

<FN>

(a) Sales loads are not reflected in computing total return.
</FN>
</TABLE>

<TABLE>
<CAPTION>

Schedule of Investments Thornburg Florida Intermediate Municipal Fund September 30, 1999
CUSIPS: Class A - 885-215-707; NASDAQ Symbol: Class A - THFLX
<S>                <C>                                                           <C>         <C>

595,000             Brevard County Tourist Development Tax Revenue Series 1993,   NR/NR        $603,092
                    6.325% due 3/1/2003(Florida Marlins Training Facilities)
400,000             Broward County Educational Facilities Authority Series        NR/AAA       417,752
                    1994, 5.60% due 4/1/2004(Nova Southeastern University
                    Project; Guaranteed: Connie Lee)
570,000             Broward County Health Facilities Authority, 7.00% due         Aaa/AAA      606,092
                    8/15/2011 (North BeachHospital Project; Insured: MBIA)
180,000             Broward County Housing Finance Authority Home Mortgage        Aa2/BBB      42,352
                    Revenue, 0% due 4/1/2014
155,000             Cape Coral Special Obligation Wastewater Revenue, 5.625%      Aaa/AAA      157,127
                    due 7/1/2000 (GreenArea Project; Insured: FSA)
300,000             Cape Coral Special Obligation Wastewater Revenue, 5.75% due   Aaa/AAA      308,013
                    7/1/2001 (Green AreaProject; Insured: FSA)
150,000             Cape Coral Special Obligation Wastewater Revenue, 6.00% due   Aaa/AAA      158,208
                    7/1/2003 (Green AreaProject; Insured: FSA)
390,000             Cape Coral Special Obligation Wastewater Revenue, 6.10% due   Aaa/AAA      401,115
                    7/1/2005 (Green AreaProject; Insured: FSA)
425,000             Clearwater Housing Authority Finance Revenue Refunding,       NR/A         419,747
                    5.40% due 5/1/2013
900,000             Clermont Water & Sewer Revenue Refunding, 5.00% due           NR/NR        907,992
                    12/1/2000
385,000             Cooper City Utility Systems Revenue, Capital Appreciation     Aaa/AAA      236,937
                    Refunding Series A, 0%due 10/1/2006
285,000             Dade County General Obligation, 7.00% due 10/1/2006           Aaa/AAA      322,460
                    (Insured: AMBAC)
230,000             Dade County Health Facilities Revenue - Catholic Health,      A1/NR        235,780
                    7.50% due 8/15/2000(LOC: Allied Irish Bank)
35,000              Duval County Single Family Housing Revenue, 10.25% due        Aaa/AAA      34,426
                    5/15/2016
135,000             Escambia Housing Finance Authority, 6.15% due 4/1/2000        Aaa/NR       135,603
                    (Collateralized: GNMA)
1,000,000           Florida Housing Development Authority, 6.25% due 12/1/2006    NR/AAA       1,025,040
                    (Hammock's PlaceProject)
250,000             Florida Housing Finance Agency Refunding Multi Family         NR/AAA       256,850
                    Housing Series C, 5.55%due 2/1/2006
1,000,000           Florida Housing Finance Agency Multi Family Housing Revenue   NR/NR        1,001,570
                    Series 1983-F, 5.35%due 12/1/2005 mandatory put 6/1/00
                    (Insured: Connecticut General)
1,000,000           Florida Housing Finance Agency Multi Family Housing Revenue   NR/NR        1,001,570
                    Series 1983-G, 5.35%due 12/1/2005 mandatory put 6/1/00
                    (Insured: Connecticut General)
310,000             Florida Housing Finance Agency Revenue Bonds, 5.30% due       Aaa/AAA      314,449
                    12/1/2004 (Insured:AMBAC)
950,000             Florida Housing Finance Authority Series 94-B, 5.70% due      NR/AAA       985,920
                    10/1/2024 mandatory put10/1/04 (Plantation Colony Project;
                    Collateralized: FNMA)
650,000             Florida Housing Finance Authority Multi Family Housing        NR/AA-       653,075
                    Revenue, 5.10% due4/1/2013 put 4/1/02 (Park Colony Project;
                    LOC: Mellon Bank)
300,000             Florida State Board of Education Series C, 6.00% due          Aaa/AA       302,064
                    5/1/2007
220,000             Florida State Board of Education Series D, 6.20% due          Aaa/AAA      222,647
                    5/1/2007 (Insured: MBIA)(ETM)
200,000             Florida State Department Corrections Certificates of          Aaa/AAA      211,264
                    Participation OkeechobeeCorrectional, 5.90% due 3/1/2004
                    (Insured: AMBAC)
95,000              Fort Myers Improvement Revenue, 6.00% due 12/1/2013           Aaa/AAA      96,100
                    (Insured: ACA)
365,000             Halifax Hospital Medical Center Health Care Facilities        NR/A         338,366
                    Revenue Series A, 5.00%due 4/1/2012 (Insured: ACA)
1,000,000           Halifax Hospital Medical Center Health Care Facilities        NR/A         904,900
                    Revenue Series A, 5.20%due 4/1/2018
300,000             Hernando County Industrial Development Revenue, 8.50% due     NR/NR        327,297
                    12/1/2014 (FloridaCrushed Stone Project)
1,000,000           Hillsborough County Industrial Development Authority, 5.50%   Aaa/AAA      1,043,490
                    due 8/15/2006(University Community Hospital Inc. Project;
                    Insured: MBIA)
1,000,000           Jacksonville Health Facilities Authority Hospital Revenue,    Aa2/AA+      1,012,810
                    5.75% due 8/15/2014
150,000             Jacksonville Health Facilities Industrial Development         Baa2/NR      151,966
                    Revenue, 5.70% due12/1/2004 (National Benevolent
                    Association Project)
100,000             Jacksonville Health Facilities Industrial Development         Baa2/NR      100,803
                    Revenue, 6.00% due12/1/2009 (National Benevolent
                    Association Project)
100,000             Jacksonville Health Facilities Industrial Development         Baa2/NR      101,998
                    Revenue, 6.05% due12/1/2010 (National Benevolent
                    Association Project)
600,000             Jacksonville Health Facilities Industrial Development         Baa1/NR      666,234
                    Revenue, 8.00% due12/1/2015 (National Benevolent
                    Association Project)
290,000             Jacksonville Housing Revenue Windermere Manor Series A,       NR/AAA       292,590
                    5.125% due 9/20/2004(Collateralized: GNMA)
100,000             Jacksonville Loan Obligation Custody Receipts, 6.10% due      Aaa/AAA      100,198
                    4/1/2001 (Insured:MBIA)
983,178             Lummus Housing Development Corp., 8.00% due 12/1/2010         NR/NR        983,178
                    (Elderly Housing, Section8 Project)
1,465,000           Manatee County Revenue, 5.00% due 4/1/2015 (when issued)      Aaa/AAA      1,365,658
2,500,000           Miami Dade County Special Obligation Subordinated Series      Aaa/AAA      1,133,375
                    1997-C, 0% due10/1/2013 (Insured: MBIA)
185,000             Mirimar Wastewater Improvement Assessment Revenue, 6.00%      Aaa/AAA      193,850
                    due 10/1/2002 (Insured:FGIC)
760,000             Mirimar Wastewater Improvement Assessment Revenue, 6.25%      Aaa/AAA      824,182
                    due 10/1/2005 (Insured:FGIC)
1,000,000           Orange County Health Facilities Authority Revenue,            NR/AA        931,970
                    Refunding, 5.125% due6/1/2014 (Mayflower Retirement
                    Project)
1,000,000           Orange County Health Facilities Authority Revenue, 5.40%      Aaa/AAA      949,630
                    due 7/1/2019 (Insured:FSA)
210,000             Orange County Housing Finance Authority, 6.10% due            NR/AAA       214,626
                    10/1/2005 (Collateralized:FNMA/GNMA)
485,000             Orange County Housing Finance Authority Multi Family,         NR/AAA       492,328
                    Revenue Series B, 5.375%due 11/1/2025 (Sun Lake Apartments
                    Project)
115,000             Osceola County Health Facilities Revenue Series 1994, 5.75%   Aaa/AAA      120,601
                    due 5/1/2004(Evangelical Lutheran Good Samaritan Project;
                    Insured: AMBAC)
100,000             Osceola County Industrial Development Authority, 7.50% due    Aaa/AAA      104,387
                    7/1/2002 (Insured:AMBAC)
515,000             Palm Beach County Industrial Development Revenue Series       NR/A+        544,082
                    1996, 6.10% due12/1/2007 (Lourdes-Noreen McKeen-Geriatric
                    Care Project; LOC: Allied Irish Bank)
270,000             Palm Beach County Industrial Development Revenue Series       NR/A+        286,637
                    1996, 6.20% due12/1/2008 (Lourdes-Noreen McKeen-Geriatric
                    Care Project; LOC: Allied Irish Bank)
690,000             Pensacola Airport Revenue, 6.25% due 10/1/2005                Aaa/AAA      745,000
800,000             Pinellas County Educational Facility Authority Revenue,       NR/NR        866,080
                    8.00% due 2/1/2011(Clearwater Christian College Project)
1,390,000           Port Orange Water And Sewer Revenue Refunding, 5.25% due      Aaa/AAA      1,409,724
                    10/1/2010 (Insured:AMBAC)
500,000             Port St. Lucie Utility System Revenue Series 1996-A, 0% due   Aaa/AAA      351,660
                    9/1/2007 (Insured:FGIC)
700,000             Saint Johns County Housing Finance Authority Housing,         NR/A1+       700,000
                    Revenue, 3.75% due11/1/2014 put 7/01/99 (daily demand
                    notes)
500,000             Seminole County School Board Certificates of Participation,   Aaa/AAA      535,200
                    5.75% due 7/1/2006(Insured: MBIA)
1,000,000           South Broward Hospital District Revenue, 7.50% due 5/1/2008   Aaa/AAA      1,112,750
                    (Insured: AMBAC)
1,000,000           Tampa Revenue, 5.50% due 11/15/2013 (Insured: MBIA)           Aaa/AAA      1,011,700
470,000             Walton County School Board Certificates Participation,        Aaa/AAA      463,176
                    5.25% due 7/1/2013(Insured: FSA)

                    TOTAL INVESTMENTS (Cost $31,328,492)                                       $ 31,437,691

                    See notes to financial statements.

</TABLE>


Report of Independent accountants

To the Board of Trustees and  Shareholders of Thornburg  Investment Trust In our
opinion,  the accompanying  statement of assets and  liabilities,  including the
schedule of investments, and the related statements of operations and of changes
in net assets and the  financial  highlights  present  fairly,  in all  material
respects,  the financial  position of Thornburg Florida  Intermediate  Municipal
Fund series of Thornburg  Investment Trust (hereafter referred to as the "Fund")
at September  30, 1999,  the results of its  operations,  the changes in its net
assets, and the financial highlights for the year then ended, in conformity with
generally  accepted  accounting  principles.   These  financial  statements  and
financial highlights  (hereafter referred to as "financial  statements") are the
responsibility  of the Fund's  management;  our  responsibility is to express an
opinion on these financial statements based on our audit. We conducted our audit
of these  financial  statements in accordance with generally  accepted  auditing
standards, which require that we plan and perform the audit to obtain reasonable
assurance   about  whether  the  financial   statements  are  free  of  material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the  amounts  and  disclosures  in  the  financial  statements,   assessing  the
accounting  principles  used and significant  estimates made by management,  and
evaluating the overall  financial  statement  presentation.  We believe that our
audit,  which  included  confirmation  of  securities  at September  30, 1999 by
correspondence  with the custodian and brokers,  provides a reasonable basis for
the  opinion  expressed  above.  The  financial  statements  for the year  ended
September  30, 1998,  including the  financial  highlights  for each of the four
years in the period then ended,  were audited by other  independent  accountants
whose report dated October 23, 1998  expressed an  unqualified  opinion on those
financial statements.  PricewaterhouseCoopersLLP  New York, New York October 29,
1999 change in Independent accountants

Thornburg Investment Trust
On August 13, 1999,  McGladrey & Pullen, LLP (McGladrey) resigned as independent
auditors of the Fund  pursuant to an  agreement  by  PricewaterhouseCoopers  LLP
(PwC) to acquire McGladrey's investment company practice. The McGladrey partners
and  professionals  serving the Fund at the time of the acquisition  joined PwC.
The reports of McGladrey on the financial statements of the Fund during the past
two fiscal years contained no adverse opinion or disclaimer of opinion, and were
not  qualified  or  modified  as  to  uncertainty,  audit  scope  or  accounting
principles.  In connection  with its audits for the two most recent fiscal years
and through August 13, 1999, there were no  disagreements  with McGladrey on any
matter of accounting principle or practices,  financial statement disclosure, or
auditing  scope  or  procedure,  which  disagreements,  if not  resolved  to the
satisfaction  of McGladrey would have caused it to make reference to the subject
matter of disagreement in connection with its report. On September 22, 1999, the
Fund,  with the  approval  of its Board of  Directors  and its Audit  Committee,
engaged PwC as its independent auditor.

Index Comparisons
Index Comparison
Compares  performance of Intermediate  Florida Fund, the Merrill Lynch Municipal
Bond  (7-12  year)  Index and the  Consumer  Price  Index,  February  1, 1994 to
September  30, 1999.  On September  30, 1999,  the weighted  average  securities
ratings  of the  Index  and the  Fund  were AA and  AA+,  respectively,  and the
weighted average  portfolio  maturities of the Index and the Fund were 9.5 years
and 8.5 years, respectively.  Past performance of the Index and the Fund may not
be indicative of future performance.













Class A
Average Annual Total Returns (at max. offering price)
(periods ended 9/30/99)
One Year:                 (2.33)%
Five Years:                4.90%
From Inception (2/01/94):  4.14%

Y2k Update
We Are Ready for the Year 2000

Dear Shareholders,

I wish to inform you about our success with respect to being Year 2000 compliant
in the computer  systems used to manage your Thornburg  funds  investment.  Your
shareholder  records  are  kept  on a large  computer  system  belonging  to our
transfer  agent,  DST Systems.  Accounting  data  pertaining to your  investment
portfolio  reside  on  large  systems  belonging  to State  Street  Bank and its
affiliates. We have smaller computer networks at Thornburg Investment Management
to help us  organize  and  manage our  investment  activities.  I will  describe
briefly the Year 2000 status of each area.

Shareholder  records for  Thornburg  funds are kept on computers  that use a DST
software  system called "TA 2000." DST is one of the largest  mutual fund record
processors in the world,  keeping shareholder records for many large mutual fund
families.  The TA 2000 system,  as is name implies,  was built with 4-digit year
description  fields  in order to be Year 2000  compliant.  To quote  from  DST's
February 1999  newsletter,  "Internal 2000 readiness  testing of TA 2000 and TRA
2000 is complete.  Several retests of critical TA 2000 (and TRAC 2000) functions
were also completed  successfully in 1998. With the completion of these internal
tests,  the TA 2000 (and TRAC 2000)  systems  are  considered  to be Y2K ready."
There are no hedge words in the preceeding 3 sentences!  I am not  surprised.  I
first  heard DST talk about  taking  concrete  measures  to deal with Y2K issues
about 8 years ago. If you worry about  electric power  continuity,  I can inform
you that DST maintains its own diesel powered backup generating station adjacent
to its computer facility.
Both are located in geologically stable limestone caves east of Kansas City.

Asset custody and fund  accounting  records of the Thornburg funds are stored on
State Street Bank computers.  We use a variety of software  systems to carry out
all activities relating to running the funds. We are informed that this software
infrastructure has been 100% tested and corrected to be Year 2000 compliant. You
can monitor State Street  Bank's  disclosure  yourself on the internet  website,
statestreet.com.

Thornburg Investment  Management has a computer network to help us carry out our
daily  business  of managing  the assets in our mutual  funds.  Our  information
technology  director,  Stewart Kane,  has made a great effort to be certain that
our software platforms are Year 2000 compliant.

We look forward to the new year.




Brian McMahon
President, Thornburg Investment Management






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