THORNBURG INVESTMENT TRUST
N-30D, 1999-11-30
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Thornburg Limited Term Income Funds
All data as of 9.30.99

Fund Facts
Thornburg Limited Term Income Fund
                                                              A Shares  C Shares
SEC Yield ...............................................        5.61%     5.30%
NAV .....................................................   $   11.93 $   11.91
Max. Offering Price .....................................   $   12.11 $   11.91

Total returns
(Annual Average - After Subtracting Maximum Sales Charge)
One Year                                                       (0.50)%     0.68%
Five Year ...............................................        6.12%     6.05%
Since Inception .........................................        5.66%     5.80%
Inception Date                                         (10.2.1992)    (9.1.1994)

Fund Facts
Thornburg Limited Term U.S. Government Fund*
                                                             A Shares   C Shares
SEC Yield ...............................................        5.43%     5.05%
NAV .....................................................   $   12.06 $   12.12
Max. Offering Price .....................................   $   12.24 $   12.12

Total returns
(Annual Average - After Subtracting Maximum Sales Charge)
One Year                                                       (1.01)%     0.13%
Five Year ...............................................        5.77%     5.63%
Ten Year                                                         6.47%      N/A
Since Inception .........................................        6.65%     5.43%
Inception Date                                         (11.16.1987)   (9.1.1994)

*Shares are not guaranteed by the U.S. Government.
The  investment  return and  principal  value of an investment in the funds 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 Funds' Class A Shares is 1.50%.
The  data  quoted  represent  past  performance  and may not be  construed  as a
guarantee of future results.

Letter to shareholders
Dear Fellow Shareholder,

I am pleased to present the Annual Report for the Thornburg  Limited Term Income
Fund and the  Thornburg  Limited  Term U.S.  Government  Fund for the year ended
September  30,  1999.  The net asset  value of the "A"  shares of the  Thornburg
Limited  Term Income Fund ended the period at $11.93.  If you were  invested for
the entire period,  you received  distributions  of 69.3 cents per share. If you
reinvested your distributions,  you received 71.2 cents per share. Investors who
owned "C" shares received 64.2 and 65.8 cents per share,  respectively.  The net
asset value of the "A" shares of the Thornburg Limited Term U.S. Government Fund
ended the period at $12.06.  If you were  invested  for the entire  period,  you
received  dividends of 65.6 cents per share.  If you reinvested  your dividends,
you received 67.3 cents per share.  Investors who owned "C" shares received 60.4
and 61.7 cents per share,  respectively.  Please read the accompanying  exhibits
for more detailed information and history.

After  falling to their lowest level in five years in October of 1998,  interest
rates  have  continued  to rise  since  then.  Since the lows in  October  1998,
interest  rates have risen over 130 basis points  (>1.3%) on all Treasury  notes
and bonds with  maturities  greater than 1 year. The five to ten year segment of
the yield curve for U.S.  Treasuries was especially  hard hit with yields rising
over 160 basis  points.  Once the  perceptions  of the fates of Southeast  Asia,
Russia and Latin America changed from imminent collapse to survival, and, in the
case of Southeast Asia,  perhaps even growth, the bond markets once again had to
look at the robustness of the U.S.  economy for the direction of interest rates.
Quality  spreads on corporate  bonds tightened in the first quarter of 1999, but
ended  September  30,  1999 at about  the same  levels  they  were at in the 4th
quarter of 1998.

The  current  level of  interest  rates on bonds  provides  a pretty  nice yield
advantage over money market rates.  This is especially  true of securities  that
pay a spread to  Treasuries,  such as government  agency bonds,  mortgage-backed
securities  and corporate  bonds.  By investing in  short-to-intermediate  bonds
there is also some protection  against the price  volatility of long-term bonds.
The  Thornburg  Limited  Term Income Fund and the  Thornburg  Limited  Term U.S.
Government Fund, with their short-to-intermediate bonds, provided positive total
returns over the last 12 months, when dividends are included.  Mutual funds with
longer maturity bonds in their portfolios did not fair as well.

The  Thornburg  Limited  Term Income Fund and the  Thornburg  Limited  Term U.S.
Government Fund are laddered  portfolios of  short-to-intermediate  bonds. We do
not  speculate  on the  direction  of  interest  rates.  We keep the  portfolios
laddered  over a time period  ranging from one day to  approximately  ten years,
with the average maturity of the portfolios always no more than five years. Some
of the bonds are  always  coming  close to  maturity,  but never too many at one
time. We feel a laddered maturity portfolio of short-to-intermediate  bonds is a
sensible  strategy  over time.  Intermediate  bonds have proven to be a sensible
part of a portfolio.  They can provide  stability to the  underlying  principal,
they can  provide  income for the  portfolio,  and,  over the  years,  they have
provided an attractive  return versus money market  instruments.  Take a look at
the charts, which show the return on an investment in the Thornburg Limited Term
Income Fund and the Thornburg Limited Term U.S. Government Fund versus the Money
Market Funds average.

Thank you for investing in our funds.  We feel the  Thornburg  Limited Term U.S.
Government  Fund and the  Thornburg  Limited  Term Income  Fund are  appropriate
investments for investors who want a short-to-intermediate bond portfolio. While
future performance  cannot be guaranteed,  we feel that our funds represent core
holdings in a diversified portfolio.



Steven J. Bohlin
Managing Director

Fund Facts
Thornburg Limited Term Income Fund I Shares
SEC Yield ..................................        6.01%
NAV ........................................   $   11.93
Max. Offering Price ........................   $   11.93

Total returns
One Year                                            1.32%
Three Year .................................        5.49%
Since Inception ............................        6.35%
Inception Date   (7.5.1996)

Fund Facts
Thornburg Limited Term U.S. Government Fund*
         I Shares
SEC Yield ..................................        5.89%
NAV ........................................   $   12.05
Max. Offering Price ........................   $   12.05

Total returns
One Year                                            0.82%
Three Year .................................        5.65%
Ten Year N/A
Since Inception ............................        6.02%
Inception Date   (7.5.1996)

*Shares are not guaranteed by the U.S. Government.
The  investment  return and  principal  value of an investment in the funds will
fluctuate so that, when redeemed, an investor's shares may be worth more or less
than their original cost. The data quoted represent past performance and may not
be construed as a guarantee of future results.

Letter to shareholders
Dear Fellow Shareholder,

I am pleased to present the Annual  Report for the  Institutional  Shares of the
Thornburg  Limited  Term  Income  Fund  and  the  Thornburg  Limited  Term  U.S.
Government  Fund for the year ended  September 30, 1999.  The net asset value of
the "I" shares of the  Thornburg  Limited  Term  Income Fund ended the period at
$11.93.  If you were invested for the entire period,  you received  dividends of
73.0 cents per share. If you reinvested your dividends,  you received 75.0 cents
per share.  The net asset value of the "I" shares of the Thornburg  Limited Term
U.S.  Government  Fund ended the period at $12.05.  If you were invested for the
entire period, you received dividends of 69.9 cents per share. If you reinvested
your dividends,  you received 71.7 cents per share. Please read the accompanying
exhibits for more detailed information and history.

After  falling to their lowest level in five years in October of 1998,  interest
rates  have  continued  to rise  since  then.  Since the lows in  October  1998,
interest  rates have risen over 130 basis points  (>1.3%) on all Treasury  notes
and bonds with  maturities  greater than 1 year. The five to ten year segment of
the yield curve for U.S.  Treasuries was especially  hard hit with yields rising
over 160 basis  points.  Once the  perceptions  of the fates of Southeast  Asia,
Russia and Latin America changed from imminent collapse to survival, and, in the
case of Southeast Asia,  perhaps even growth, the bond markets once again had to
look at the robustness of the U.S.  economy for the direction of interest rates.
Quality  spreads on corporate  bonds tightened in the first quarter of 1999, but
ended  September  30,  1999 at about  the same  levels  they  were at in the 4th
quarter of 1998.

The  current  level of  interest  rates on bonds  provides  a pretty  nice yield
advantage over money market rates.  This is especially  true of securities  that
pay a spread to  Treasuries,  such as government  agency bonds,  mortgage-backed
securities  and corporate  bonds.  By investing in  short-to-intermediate  bonds
there is also some protection  against the price  volatility of long-term bonds.
The  Thornburg  Limited  Term Income Fund and the  Thornburg  Limited  Term U.S.
Government Fund, with their short-to-intermediate bonds, provided positive total
returns over the last 12 months, when dividends are included.  Mutual funds with
longer maturity bonds in their portfolios did not fair as well.

The  Thornburg  Limited  Term Income Fund and the  Thornburg  Limited  Term U.S.
Government Fund are laddered  portfolios of  short-to-intermediate  bonds. We do
not  speculate  on the  direction  of  interest  rates.  We keep the  portfolios
laddered  over a time period  ranging from one day to  approximately  ten years,
with the average maturity of the portfolios always no more than five years. Some
of the bonds are  always  coming  close to  maturity,  but never too many at one
time. We feel a laddered maturity portfolio of short-to-intermediate  bonds is a
sensible  strategy  over time.  Intermediate  bonds have proven to be a sensible
part of a portfolio.  They can provide  stability to the  underlying  principal,
they can  provide  income for the  portfolio,  and,  over the  years,  they have
provided an attractive  return versus money market  instruments.  Take a look at
the charts, which show the return on an investment in the Thornburg Limited Term
Income Fund and the Thornburg Limited Term U.S. Government Fund versus the Money
Market Funds average.

Thank you for investing in our funds.  We feel the  Thornburg  Limited Term U.S.
Government  Fund and the  Thornburg  Limited  Term Income  Fund are  appropriate
investments for investors who want a short-to-intermediate bond portfolio. While
future performance  cannot be guaranteed,  we feel that our funds represent core
holdings in a diversified portfolio.



Steven J. Bohlin
Managing Director

Index Comparisons
GOVERNMENT FUND
Index Comparisons
Compares  performance  of the  Government  Fund  Class I  shares  to the  Lehman
Brothers  Intermediate  Government Bond Index,  and the Consumer Price Index for
the periods  ended  September  30,  1999.  On September  30, 1999,  the weighted
average  securities  ratings  of the  Index  and the  Fund  were  AAA  and  AAA,
respectively, and the weighted average portfolio maturities of the Index and the
Fund were 3.9 years and 4.2 years, respectively. Class I shares became available
on  July 5,  1996.  Past  performance  of the  Index  and  the  Fund  may not be
indicative of future performance.











Average Annual Total Returns  (periods ending 9/30/99)
(at max. offering price)
One Year:                       0.82%
Three Years:                    5.65%
From Inception (7/5/96):        6.02%












INCOME FUND
Index Comparisons
Compares  performance  of the Income Fund Class I shares to the Lehman  Brothers
Intermediate  Government  Corporate  Bond Index and the Consumer Price Index for
the periods  ended  September  30,  1999.  On September  30, 1999,  the weighted
average   securities  ratings  of  the  Index  and  the  Fund  were  A  and  AA,
respectively, and the weighted average portfolio maturities of the Index and the
Fund were 4.3 years and 4.8 years, respectively. Class I shares became available
on  July 5,  1996.  Past  performance  of the  Index  and  the  Fund  may not be
indicative of future performance.













Average Annual Total Returns (periods ending 9/30/99)
(at max. offering price)
One Year:                  1.32%
Three Years:               5.49%
From Inception (7/5/96):   6.35%


Thornburg Limited Term U.S. Government Fund - Class I
Outperformed Taxable Money Market Funds
Return from a $100,000 Investment 9/30/89 to 9/30/99
Donoghue's Taxable
Money Market Fund Average
$61,647
Thornburg Limited Term
U.S. Government Fund
$97,086

The chart  above is for the Funds'  Class 1 Shares  only.  See the inside  front
cover  page for the  30-day  SEC  yield  and the total  returns  at the  maximum
offering prices for one year,  three years,  and since inception for the Class I
shares of the Fund.  The  illustration  includes  actual  returns of the Class A
shares adjusted for the lower Institutional expenses.  Return for the money fund
average is based upon 30-day yield  quotations for taxable money funds as quoted
in "Donoghue's  Money Fund Report" for the months covered by this analysis.  The
return for Limited Term U.S.  Government  Fund is based upon the dividends  paid
for the months covered by this analysis,  the beginning offering price of $11.95
and the ending NAV of $12.05.  These  investments  returned the $100,000 initial
investment  in addition to the amounts shown above.  This analysis  assumes that
the  dividends  from  each of these  investment  vehicles  were  reinvested  and
compounded  monthly.  Most  money  funds  declare  dividends  daily and pay them
monthly.  LTUIX also declares dividends daily and pays them monthly. The average
money  market fund  increases  shown may differ from the return of a  particular
fund. It is not possible to invest in these money fund averages.  Note 1: Future
performance  of any of  these  investments  may  bear no  relationship  to prior
performance.  Note 2: This  analysis  does not take into account the effect,  if
any,  caused by taxes.  Note 3: The net asset  value of the money  funds did not
fluctuate.  Money funds seek to  maintain a constant  net asset  value.  The net
asset value of the Limited Term U.S. Government Fund did vary from time to time,
and it will  continue  to vary in the  future.  The  analysis  assumes  that the
investor  receives the net asset value of shares owned,  plus accrued income, at
redemption.  Due to the effect of sales commissions,  the net asset value of the
Limited Term U.S.  Government Fund shares is less than the offering price of the
shares.  Redemptions  are made at the then  current  net asset value and you may
have a gain or a loss when you redeem shares.

Thornburg  Limited Term Income Fund - Class I Outperformed  Taxable Money Market
Funds Return from a $100,000  Investment  9/30/94 to 9/30/99  Donoghue's Taxable
Money Market Fund Average $27,776 Thornburg Limited Term Income Fund $38,388

The chart  above is for the Fund's  Class I Shares  only.  See the inside  front
cover  page for the  30-day  SEC  yield  and the total  returns  at the  maximum
offering prices for one year,  three years,  and since inception for the Class I
shares of the Fund.  The  illustration  includes  actual  returns of the Class A
shares adjusted for the lower Institutional expenses.  Return for the money fund
average is based upon 30 day yield  quotations for taxable money funds as quoted
in "Donoghue's  Money Fund Report" for the months covered by this analysis.  The
return for Limited  Term Income  Fund is based upon the  dividends  paid for the
months  covered by this  analysis,  the beginning  offering  price of $11.95 per
share,  respectively and the ending NAV of $11.93 per share.  These  investments
returned the $100,000 initial investment in addition to the amounts shown above.
This analysis assumes that the dividends from each of these investment  vehicles
were reinvested and compounded monthly. Most money funds declare dividends daily
and pay them monthly. THIIX also declares dividends daily and pays them monthly.
The average  money market fund  increases  shown may differ from the return of a
particular fund. It is not possible to invest in these money fund averages. Note
1: Future  performance of any of these  investments  may bear no relationship to
prior performance.  Note 2: This analysis does not take into account the effect,
if any, caused by taxes.  Note 3: The net asset value of the money funds did not
fluctuate.  Money funds seek to  maintain a constant  net asset  value.  The net
asset value of Limited Term Income Fund did vary from time to time,  and it will
continue to vary in the future.  The analysis assumes that the investor receives
the net asset value of shares owned, plus accrued income, at redemption.  Due to
the effect of sales commissions,  the net asset value of the Limited Term Income
Fund shares are less than the offering price of the shares. Redemptions are made
at the then  current  net asset value and you may have a gain or a loss when you
redeem shares.
<TABLE>
<CAPTION>

Statements of assets and liabilities
                                                                             Limited Term U.S.     Limited Term
                                                                              Government Fund       Income Fund
ASSETS

<S>                                                                               <C>             <C>
Investments at value (cost $127,747,973
and $59,020,534, respectively) .................................................   $127,102,574   $ 58,681,209
Cash ...........................................................................        162,649        123,555
Receivable for fund shares sold ................................................        117,287        118,539
Receivable for investments sold ................................................            438        263,057
Interest receivable ............................................................      1,599,843        979,308
Principal receivable ...........................................................         42,433         24,293
Prepaid expenses and other assets ..............................................         28,336         24,399
                  Total Assets .................................................    129,053,560     60,214,360

LIABILITIES

Payable for investments purchased ..............................................      1,211,628      1,303,248
Reverse repurchase agreement ...................................................        994,749              0
Payable for fund shares redeemed ...............................................        259,609        184,379
Accounts payable and accrued expenses ..........................................         48,305        117,938
Payable to Investment Advisor ..................................................         42,182         19,022
Dividends payable ..............................................................        153,034         84,879
                  Total Liabilities ............................................      2,709,507      1,709,466

NET ASSETS .....................................................................   $126,344,053   $ 58,504,894

NET ASSET VALUE:

Class A Shares:
Net asset value and redemption  price per share ($113,215,434 and  $ 41,049,576
applicable to 9,390,881 and 3,440,200 shares of
beneficial interest outstanding - Note 4) ......................................  $      12.06   $      11.93

Maximum sales charge, 1.50 % of offering
price (1.52% of net asset value per share) .....................................          0.18           0.18
Maximum Offering Price Per Share ...............................................  $      12.24   $      12.11

Class C Shares:
Net asset value and offering price per share * ($7,516,463 and
$7,527,607 applicable to 620,300 and 632,235 shares of beneficial
interest outstanding - Note 4) .................................................  $      12.12   $      11.91

Class I Shares:
Net asset value and offering price per share ($5,612,156 and
$9,927,711 applicable to 465,827 and 832,216 shares of beneficial
interest outstanding - Note 4) .................................................  $      12.05   $      11.93

<FN>

*  Redemption  price per share is equal to net asset  value less any  applicable
contingent deferred sales charges. See notes to financial statements.
</FN>
</TABLE>

<TABLE>
<CAPTION>
Statements of operations
                                                            Limited Term U.S.     Limited Term
                                                             Government Fund      Income Fund
INVESTMENT INCOME:
<S>                                                              <C>            <C>
Interest income (net of premium amortized
of $519,856 and $111,382, respectively) .......................   $ 8,297,961    $ 3,607,299

EXPENSES:
Investment advisory fees (Note 3) .............................       495,535        270,173
Administration fees (Note 3)
         Class A Shares .......................................       150,667         47,232
         Class C Shares .......................................         9,148          8,923
         Class I Shares .......................................         2,145          4,555
Distribution and service fees (Note 3)
         Class A Shares .......................................       290,728         89,287
         Class C Shares .......................................        73,191         71,360
Transfer agent fees ...........................................       133,104         73,577
Custodian fees ................................................        91,985         67,685
Registration and filing fees ..................................        43,138         38,239
Professional fees .............................................        14,902          4,943
Accounting fees ...............................................        12,857          5,337
Trustee Fees ..................................................         4,434            633
Interest ......................................................         7,795          7,040
Other expenses ................................................        11,700         11,403

         Total Expenses .......................................     1,341,329        700,387

Less:
         Expenses reimbursed by investment advisor (Note 3) ...       (32,979)      (126,330)
         Distribution and service fees waived (Note 3) ........       (36,598)       (35,667)

         Net Expenses .........................................     1,271,752        538,390
         Net Investment Income ................................     7,026,209      3,068,909

REALIZED AND UNREALIZED GAIN (LOSS) (Note 5)
Net Realized gain (loss) on:
Investments ...................................................       113,049       (248,377)
Foreign currency transactions .................................             0         14,504
                                                                      113,049       (233,873)

Net change in unrealized appreciation (depreciation) on:
Investments ...................................................    (6,623,311)    (2,252,563)
Foreign currency translation ..................................             0          1,949
                                                                   (6,623,311)    (2,250,614)
         Net Realized and Unrealized Gain (Loss) on Investments    (6,510,262)    (2,484,487)
         Net Increase in Net Assets Resulting From Operations $       515,947    $   584,422


See notes to financial statements.
</TABLE>

<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 ................................................   $   7,026,209    $   7,784,612
Net realized gain on investments sold ................................         113,049          139,163
Unrealized appreciation (depreciation)
         of investments ..............................................      (6,623,311)       3,564,928

                  Net Increase in Net Assets Resulting From Operations         515,947       11,488,703

DIVIDENDS TO SHAREHOLDERS:
From net investment income
         Class A Shares ..............................................      (6,424,230)      (7,311,154)
         Class C Shares ..............................................        (357,487)        (243,829)
         Class I Shares ..............................................        (244,492)        (229,629)

FUND SHARE TRANSACTIONS - (Note 4):
         Class A Shares ..............................................     (10,147,111)      (7,874,739)
         Class C Shares ..............................................       1,429,265        1,991,492
         Class I Shares ..............................................       3,563,264       (3,084,806)

                  Net Increase (Decrease) in Net Assets ..............     (11,664,844)      (5,263,962)

NET ASSETS:

         Beginning of year ...........................................     138,008,897      143,272,859

         End of year .................................................   $ 126,344,053    $ 138,008,897



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


Statements of changes in net assets
                                                                            Year Ended        Year Ended
                                                                       September 30, 1999 September 30, 1998

INCREASE (DECREASE) IN
NET ASSETS FROM:

OPERATIONS:
Net investment income ................................................   $   3,068,909    $   2,645,277
Net realized gain (loss) on investments sold .........................        (233,873)        (290,262)
Unrealized appreciation (depreciation) of investments ................      (2,250,614)         837,189

                  Net Increase in Assets Resulting from Operations ...         584,422        3,192,204

DIVIDENDS TO SHAREHOLDERS:
From net investment income
         Class A Shares ..............................................      (1,970,027)      (1,937,609)
         Class C Shares ..............................................        (344,083)        (352,730)
         Class I Shares ..............................................        (502,339)        (354,938)

RETURN OF CAPITAL
         Class A Shares ..............................................        (177,137)               0
         Class C Shares ..............................................         (32,483)               0
         Class I Shares ..............................................         (42,840)               0

FUND SHARE TRANSACTIONS - (Note 4):
         Class A Shares ..............................................       6,919,340        4,205,120
         Class C Shares ..............................................         710,310        1,689,924
         Class I Shares ..............................................       2,578,404        3,181,451

                  Net Increase in Net Assets .........................       7,723,567        9,623,422


NET ASSETS:

         Beginning of year ...........................................      50,781,327       41,157,905
         End of year (Includes distribution in excess
         of net investment income of $84,879) ........................   $  58,504,894    $  50,781,327

</TABLE>


See notes to financial statements.


Notes to financial statements
Note 1 - Organization
Thornburg  Limited  Term  U.S.  Government  Fund  (the  "Government  Fund")  and
Thornburg  Limited Term Income Fund (the "Income Fund"),  hereafter  referred to
collectively  as the "Funds",  are  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 six series of shares of
beneficial  interest  in  addition  to  those  of  the  Funds:Thornburg  Florida
Intermediate  Municipal Fund,  Thornburg New York  Intermediate  Municipal Fund,
Thornburg  New  Mexico  Intermediate   Municipal  Fund,  Thornburg  Intermediate
Municipal  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 Funds' objectives are to obtain as high a level of current income
as is consistent  with the  preservation  of capital.  The Funds currently offer
three  classes  of  shares  of  beneficial  interest,   Class  A,  Class  C  and
Institutional  Class (Class I) shares. Each class of shares of a Fund represents
an interest in the same portfolio of  investments  of the Fund,  except that (i)
Class A shares are sold  subject to a front-end  sales  charge  collected at the
time the shares are  purchased  and bear a service fee,  (ii) Class C shares are
sold at net asset value without a sales charge at the time of purchase,  but are
subject to a service fee and a  distribution  fee, (iii) Class I shares are sold
at net asset value without a sales charge at the time of purchase,  and (iv) the
respective classes have different reinvestment  privileges.  Additionally,  each
Fund may allocate among its classes certain expenses, to the extent allowable to
specific classes,  including transfer agent fees, government  registration fees,
certain  printing and postage  costs,  and  administrative  and legal  expenses.
Currently,  class  specific  expenses of the Funds are  limited to  distribution
fees,  administrative  fees  and  certain  transfer  agent  expenses.

Note  2 -
Significant  Accounting Policies Significant accounting policies of the Fund are
as follows: Valuation of Investments:  In determining net asset value, the Funds
utilize 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  4:00  pm 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 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 Funds are reviewed by the officers of the Trust under
the  general  supervision  of the  Trustees.  Short-term  instruments  having  a
maturity  of 60 days or less are valued at  amortized  cost,  which  approximate
market value. Federal Income Taxes: It is the policy of the Funds to comply with
the provisions of the Internal Revenue code applicable to "regulated  investment
companies"  and to  distribute  all of their taxable  income,  including any net
realized gain on  investments  to its  shareholders.  Therefore no provision for
federal  income  taxes is  required.  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 Funds may engage in when-issued or delayed
delivery transactions. To the extent the Funds engage in such transactions, they
will do so for the purpose of acquiring  portfolio  securities  consistent  with
their investment objectives and not for the purpose of investment leverage or to
speculate on interest  rate  changes.  At the time a Fund makes a commitment  to
purchase a security on a when-issued  basis,  it will record the transaction and
reflect the value in determining the Fund's 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 at
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 Funds are declared daily as a dividend on shares for which the Funds have
received  payment.  Dividends are paid monthly and are  reinvested in additional
shares of the Funds 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. The Funds invest in various mortgage backed  securities.  Such securities
pay interest and a portion of principal  each month which is then  available for
investment in securities at prevailing  prices.  Foreign Currency  Transactions:
With  respect to the Income  Fund,  portfolio  securities  and other  assets and
liabilities  denominated in foreign  currencies are translated into U.S. dollars
based on the rate of exchange of such  currencies  against  U.S.  dollars on the
date of  valuation.  Purchases  and sales of portfolio  securities  and interest
denominated in foreign currencies are translated into U.S. dollar amounts on the
respective dates of such transactions. The Fund does not isolate that portion of
the results of operations  resulting  from changes in foreign  exchange rates on
investments  from the  fluctuations  arising  from  changes in market  prices of
securities  held.  Such  fluctuations  are  included  with the net  realized and
unrealized gain or loss from investments. Reported net realized foreign exchange
gains or losses arise from sales of foreign currencies, currency gains or losses
realized between the trade and settlement  dates on securities  transactions and
the difference  between the amount of interest recorded on the Fund's books, and
the U.S.  dollar  equivalent of the amounts  actually  received or paid.  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  to the Funds 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 3/8 of 1% to 11/40 of 1% of the  average  daily net  assets of the
Government  Fund and 1/2 of 1% to 11/40 of 1% of the average daily net assets of
the Income  Fund  depending  on each Fund's  asset size.  The Funds also have an
Administrative  Services  Agreement  with the Adviser,  whereby the Adviser will
perform certain  administrative  services for the  shareholders of each class of
each 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 Class A and Class C
shares,  and up to 1/20 of 1% of the average  daily net assets  attributable  to
Class I shares.  For the year ended September 30, 1999, the Adviser  voluntarily
reimbursed  certain operating expenses amounting to $32,979 and $126,330 for the
Government  Fund and Income  Fund,  respectively.  The Funds  have  underwriting
agreements with Thornburg Securities Corporation (the "Distributor"), which acts
as the Distributor of the Funds' shares.  For the year ended September 30, 1999,
the Distributor earned commissions  aggregating $10,874 and $7,715 from the sale
of Class A shares of the  Government  Fund and Income  Fund,  respectively,  and
collected  contingent  deferred sales charges aggregating $2,112 and $2,387 from
redemptions  of  Class  C  shares  of  the  Government  Fund  and  Income  Fund,
respectively.  Pursuant  to a Service  Plan under  Rule 12b-1 of the  Investment
Company  Act of 1940,  each Fund may  reimburse  to the Adviser an amount not to
exceed 1/4 of 1% annum of its average net assets attributable to the Class A and
Class C shares of the Funds  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 each Fund's  shares.  The Funds have also adopted  Distribution
Plans  pursuant to Rule  12b-1,  applicable  only to each Fund's  Class C shares
under which the Funds  compensate the  Distributor for services in promoting the
sale of Class C shares of the Funds at an annual rate of up to 3/4% of 1% of the
average daily net assets attributable to Class C shares.  Total fees incurred by
each  class  of  shares  of  the  Funds  under  their  respective   Service  and
Distribution  Plans and the amount waived for the year ended  September 30, 1999
are set forth in the statement of operations.

Certain officers and trustees of the Trust are also officers and/or directors of
the Adviser and Distributor.  The compensation of unaffiliated 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 $133,662,223 and $59,998,851
for the Government Fund and Income Fund,  respectively.  Sales of Class I shares
commenced on July 5, 1996. Transactions in shares of beneficial interest were as
follows:

<TABLE>
<CAPTION>
Government Fund

                                                           Year Ended September 30, 1999            Year Ended September 30, 1998

Class A Shares .......................................        Shares                  Amount            Shares          Amount
<S>                                                         <C>                     <C>                <C>          <C>
Shares sold ..........................................      1,687,187               $ 20,772,075       2,343,398    $ 29,089,064
Shares issued to shareholders in
         reinvestment of dividends ...................        365,972                  4,498,080         408,731       5,065,254
Shares repurchased ...................................     (2,877,290)               (35,417,266)     (3,395,632)    (42,029,057)

Net (Decrease) .......................................       (824,131)              ($10,147,111)       (643,503)   ($ 7,874,739)

Class C Shares .......................................         Shares                     Amount          Shares          Amount
Shares sold ..........................................        296,895               $  3,701,013         268,890    $  3,352,878
Shares issued to shareholders
         in reinvestment of distributions ............         24,792                    305,762          16,876         210,103
Shares repurchased ...................................       (208,348)                (2,577,510)       (126,412)     (1,571,489)

Net Increase .........................................        113,339               $  1,429,265         159,354    $  1,991,492

Class I Shares .......................................         Shares                     Amount          Shares          Amount
Shares sold ..........................................        357,156               $  4,419,073         349,738    $  4,333,129
Shares issued to shareholders in
         reinvestment of dividends ...................         19,438                    237,764          16,580         205,349
Shares repurchased ...................................        (88,647)                (1,093,573)       (615,938)     (7,623,284)

Net Increase (Decrease) ..............................        287,947                   $3,563,2        (249,620)   ($ 3,084,806)

Note  4- Shares of Beneficial Interest . . . continued
Income Fund





                                                    Year Ended September 30, 1999                  Year Ended September 30, 1998

Class A Shares .......................................         Shares                     Amount          Shares          Amount

Shares sold ..........................................      1,093,764               $ 13,307,019         871,449    $ 10,757,352
Shares issued to shareholders in
         reinvestment of dividends ...................        117,354                  1,428,223          98,517       1,214,844
Shares repurchased ...................................       (640,785)                (7,815,902)       (629,596)     (7,767,076)

Net Increase .........................................        570,333               $  6,919,340         340,370    $  4,205,120

Class C Shares .......................................         Shares                     Amount          Shares          Amount
Shares sold ..........................................        220,299               $  2,684,267         278,808    $  3,432,785
Shares issued to shareholders
         in reinvestment of distributions ............         25,540                    310,368          24,958         307,071
Shares repurchased ...................................       (186,698)                (2,284,325)       (166,840)     (2,049,932)

Net Increase .........................................         59,141                   $710,310         136,926    $  1,689,924

Class I Shares .......................................         Shares                     Amount          Shares          Amount
Shares sold ..........................................        410,854               $  5,027,548         333,013    $  4,102,752
Shares issued to shareholders in
         reinvestment of dividends ...................         33,598                    408,669          20,510         252,865
Shares repurchased ...................................       (233,959)                (2,857,813)        (95,336)     (1,174,166)

Net Increase .........................................        210,493               $  2,578,404         258,187    $  3,181,451
</TABLE>


Thornburg Investment Trust
Note 5 - Securities Transactions
For the year ended Spetember 30, 1999,  portfolio purchase and sale transactions
(excluding  short-term  securities)  were  $44,479,641  and  $25,788,738 for the
Government   Fund  and   $35,212,923   and  $25,599,940  for  the  Income  Fund,
respectively.  The cost of  investments  for  Federal  income  tax  purposes  is
$127,747,973   and   $59,020,534  for  the  Government  Fund  and  Income  Fund,
respectively.   At  September  30,  1999,  gross  unrealized   appreciation  and
depreciation  of  investments,  based on cost for Federal  income  taxes were as
follows:
                                   Government Fund          Income Fund
Gross Unrealized Appreciation      $1,012,910               $402,816

Gross Unrealized Depreciation       1,658,309                742,141

Net Unrealized Appreciation         ($645,399)             ($339,325)


Accumulated net realized losses from securities  transactions included
in net assets at September 30, 1999 aggregated $6,672,771 and $1,070,099 for the
Government Fund and Income Fund, respectively.  For Federal income tax purposes,
the  Government  Fund  has  capital  loss   carryforwards  of  $6,673,000.   The
carryforwards  expire in varying  amounts  through 2003.  For Federal income tax
purposes,  the Income Fund had deferred  capital losses  occuring  subsequent to
October 31, 1998 of $256,000 and capital  loss  carryforwards  of $814,000.  The
carryforwards expire in varying amounts through 2003.

<TABLE>
<CAPTION>
Financial highlightsThornburg Limited Term U.S. Government Fund
                                                                                  Year Ended September 30,
                                                                  1999            1998         1997         1996            1995
Class A Shares:
<S>                                                     <C>             <C>             <C>          <C>          <C>
Net asset value, beginning of year ..................   $        12.66  $        12.31  $     12.24  $     12.40  $        12.03

Income from investment operations:
         Net investment income ......................             0.66            0.69         0.75         0.76            0.75
         Net realized and unrealized
         gain (loss) on investments .................            (0.60)           0.35         0.07        (0.16)           0.37


Total from investment operations ....................             0.06            1.04         0.82         0.60            1.12
Less dividends from:
         Net investment income ......................            (0.66)          (0.69)       (0.75)       (0.76)          (0.75)


Change in net asset value ...........................            (0.60)           0.35         0.07        (0.16)           0.37


Net asset value, end of year ........................   $        12.06  $        12.66  $     12.31  $     12.24  $        12.40

Total return (a) ....................................             0.48%           8.75%        6.86%        4.92%           9.66%

Ratios/Supplemental Data Ratios to average net asset:
         Net investment income ......................             5.33%           5.61%        6.09%        6.11%           6.23%
Expenses, after expense reductions ..................             0.95%           0.97%        0.97%        0.99%           0.99%
Expenses, before expense reductions .................             0.95%           0.97%        0.97%        0.99%           0.99%
Portfolio turnover rate .............................            19.39%          29.77%       41.10%       23.27%          28.31%

Net assets at end of year (000) .....................   $       113,215     $   129,312     $133,711  $   139,510   $     142,849

<FN>


(a) Sales loads are not reflected in computing total return.

Note:  From September 1, 1994 to September 28, 1995 the Fund issued Class B
shares, which at the time of their conversion to Class A shares on September
28, 1995 represented less than 1% of the Fund's net assets.
</FN>
</TABLE>

<TABLE>
<CAPTION>

Thornburg Limited Term U.S. Government Fund
                                                                                  Year Ended September 30,
                                                               1999            1998         1997         1996            1995
Class C Shares:
<S>                                                     <C>             <C>             <C>          <C>          <C>
Net asset value, beginning of year ..................   $        12.71  $        12.37  $     12.29  $     12.45  $        12.08

Income from investment operations:
         Net investment income ......................             0.60            0.64         0.70         0.71
                                                                                                                            0.69
         Net realized and unrealized
         gain (loss) on investments .................            (0.59)           0.34         0.08        (0.16)
                                                                                                                            0.37


Total from investment operations ....................             0.01            0.98         0.78         0.55            1.06
Less dividends from:
         Net investment income ......................            (0.60)          (0.64)       (0.70)       (0.71)
                                                                                                                           (0.69)

Change in net asset value ...........................            (0.59)           0.34         0.08        (0.16)           0.37


Net asset value, end of year ........................   $        12.12  $        12.71  $     12.37  $     12.29  $
                                                                                                                           12.45

Total return (a) ....................................             0.13%           8.19%        6.49%        4.51%           9.07%

Ratios/Supplemental Data Ratios to average net asset:
         Net investment income ......................             4.88%           5.16%        5.65%        5.72%
                                                                                                                            5.68%
         Expenses, after expense reductions .........             1.40%           1.40%        1.40%        1.39%
                                                                                                                            1.52%
         Expenses, before expense reductions ........             1.98%           2.20%        2.24%        2.35%
                                                                                                                            2.30%

Portfolio turnover rate .............................            19.39%          29.77%       41.10%       23.27%          28.31%

Net assets at end of year (000)                             $    7,516      $    6,445     $  4,299    $   2,780      $     2,217

<FN>

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

<TABLE>
<CAPTION>

Thornburg Limited Term U.S. Government Fund
                                   Year Ended September 30,
                                                      1999               1998              1997             1996*
Class I Shares:
<S>                                              <C>              <C>            <C>              <C>
Net asset value, beginning of year               $   12.65        $     12.31    $        12.24   $        12.14


Income from investment operations:
         Net investment income                        0.70              0.74               0.79             0.20
         Net realized and unrealized
         gain (loss) on investments                  (0.60)             0.34               0.07             0.10


Total from investment operations                      0.10              1.08               0.86             0.30
Less dividends from:
         Net investment income                       (0.70)            (0.74)             (0.79)           (0.20)


Change in net asset value                            (0.60)             0.34               0.07             0.10

Net asset value, end of year                      $  12.05    $        12.65    $         12.31    $       12.24

Total return (a)                                      0.82%            9.06%              7.26%             2.45%

Ratios/Supplemental Data Ratios to average net asset:
         Net investment income                        5.69%            6.01%              6.35%             6.64%(b)
         Expenses, after expense reductions           0.60%            0.60%              0.60%             0.58%(b)
         Expenses, before expense reductions          1.06%            1.18%              6.57%           305.74%(b)

Portfolio turnover rate                              19.39%           29.77%             41.10%            23.27%

Net assets at end of year (000)                   $  5,612          $ 2,250         $    5,263       $       9
<FN>

(a) Not annualized for periods less than one year.
(b) Annualized
      Sales of Class I shares commenced on July 5, 1996.
</FN>
</TABLE>

<TABLE>
<CAPTION>

Thornburg Limited Term Income Fund
                                                                                    Year Ended September 30,
                                                               1999            1998         1997         1996            1995
Class A Shares:
<S>                                                     <C>             <C>             <C>          <C>          <C>
Net asset value, beginning of year ..................   $        12.50  $        12.37  $     12.23  $     12.11  $        11.83

Income from investment operations:
         Net investment income ......................             0.69            0.72         0.76         0.76            0.76
         Net realized and unrealized
         gain (loss) on investments .................            (0.57)           0.13         0.14         0.12            0.28


Total from investment operations ....................             0.12            0.85         0.90         0.88            1.04
Less dividends from:
         Net investment income ......................            (0.64)          (0.72)       (0.76)       (0.76)          (0.76)
         Return of capital ..........................            (0.05)                        0            0               0
                                                                                                                            0

Change in net asset value ...........................            (0.57)           0.13         0.14         0.12            0.28


Net asset value, end of year ........................   $        11.93  $        12.50  $     12.37  $     12.23  $        12.11

Total return (a) ....................................             1.02%           7.08%        7.56%        7.54%           9.22%
Ratios/Supplemental Data
Ratios to average net asset:
         Net investment income ......................             5.68%           5.81%        6.16%        6.31%           6.50%
Expenses, after expense reductions ..................             0.99%           1.00%        1.00%        0.95%           0.83%
Expenses, before expense reductions .................             1.19%           1.22%        1.27%        1.37%           1.48%
Portfolio turnover rate .............................            48.50%          41.01%       13.87%       44.35%          43.12%
Net assets at end of year (000) .....................$          41,050  $       35,866  $    31,281  $     23,433     $    23,222

<FN>

(a) Sales loads are not reflected in computing total return.
Note:  From  September  1, 1994 to  September  28, 1995 the Fund issued  Class B
shares, which at the time of their conversion to Class A shares on September 28,
1995 represented less than 1% of the Fund's net assets.
</FN>
</TABLE>

<TABLE>
<CAPTION>

Thornburg Limited Term Income Fund
                                                                                        Year Ended September 30,
                                                               1999            1998         1997         1996            1995
Class C Shares:
<S>                                                     <C>             <C>             <C>          <C>          <C>
Net asset value, beginning of year ..................   $        12.47  $        12.34  $     12.20  $     12.08  $        11.78

Income from investment operations:
                  Net investment income .............             0.64            0.66         0.71         0.71            0.70
Net realized and unrealized
                  gain (loss) on investments ........            (0.56)           0.13         0.14         0.12            0.30

Total from investment operations ....................             0.08            0.79         0.85         0.83            1.00
Less dividends from:
                  Net investment income .............            (0.59)          (0.66)       (0.71)       (0.71)          (0.70)
                  Return of capital .................            (0.05)                        0            0               0
                                                                                                                            0
         Change in net asset value ..................            (0.56)           0.13         0.14         0.12            0.30

Net asset value, end of year ........................   $        11.91  $        12.47  $     12.34  $     12.20  $        12.08

Total return (a) ....................................             0.68%           6.65%        7.13%        7.12%           8.87%
Ratios/Supplemental Data
Ratios to average net asset:
                  Net investment income .............             5.28%           5.40%        5.76%        5.91%           6.03%
Expenses, after expense reductions ..................             1.40%           1.40%        1.40%        1.36%           1.20%
                  Expenses, before expense reductions             2.22%           2.30%        2.44%        3.20%
                                                                                                                            1.20%

Portfolio turnover rate .............................            48.50%          41.01%       13.87%       44.35%          43.12%

Net assets at end of year (000)                      $           7,528        $  7,147 $      5,382 $      2,695  $        1,032

<FN>

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

<TABLE>
<CAPTION>

Thornburg Limited Term Income Fund
                                            Year Ended September 30,
                                                       1999             1998               1997              1996*
Class I Shares:
<S>                                            <C>              <C>               <C>              <C>
Net asset value, beginning of year             $       12.50    $        12.36    $        12.23   $         11.95


Income from investment operations:
                  Net investment income                 0.73              0.75              0.80              0.19
                  Net realized and unrealized
                  gain (loss) on investments           (0.57)             0.14              0.13              0.28


Total from investment operations                        0.16              0.89              0.93              0.47
Less dividends from:
                  Net investment income                (0.68)            (0.75)            (0.80)            (0.19)
                  Return of capital                    (0.05)               0                0                 0

Change in net asset value                              (0.57)             0.14              0.13              0.28


Net asset value, end of year                   $       11.93    $        12.50    $        12.36   $         12.23

Total return (a)                                       1.32%             7.49%             7.80%              3.97%

Ratios/Supplemental Data Ratios to average net asset:
                  Net investment income                5.99%             6.10%             6.44%             6.67%(b)
                  Expenses, after expense reductions   0.69%             0.69%             0.69%             0.69%(b)
                  Expenses, before expense reductions  1.01%             1.19%             1.98%             4.26%(b)

Portfolio turnover rate                               48.50%            41.01%            13.87%            44.35%

Net assets at end of year (000)            $          9,928 $           7,768 $           4,495   $           797

<FN>

(a)  Not annualized for periods less than one year.
(b)  Annualized.
*  Sales of Class I shares commenced on July 5, 1996.
</FN>
</TABLE>

<TABLE>
<CAPTION>

Schedule of Investments  Thornburg  Limited Term U.S. Government Fund
September 30,  1999
CUSIPS:  Class  A -  885-215-103,  Class C -  885-215-830,  Class I - 885-215-699
NASDAQ Symbols: Class A - LTUSX, Class C - LTUCX (Proposed), Class I - LTUIX (Proposed)

                             U.S. Government Agencies (68.60%)
<S>                          <C>                                                       <C>
2,200,000                    Federal Farm Credit Bank Consolidated MTNS, 5.92% due      $2,141,729
                             12/29/2004
200,000                      Federal Farm Credit Bank Consolidated MTNS, 5.35% due      180,782
                             12/11/2008
2,000,000                    Federal Home Loan Bank Board, 5.63% due 9/2/2003           1,947,180
265,000                      Federal Home Loan Bank Board, 6.55% due 3/7/2005           265,868
1,100,000                    Federal Home Loan Bank Board, 5.95% due 6/13/2005          1,070,091
100,000                      Federal Home Loan Bank Board, 6.345% due 11/1/2005         98,984
2,265,000                    Federal Home Loan Bank Board, 6.50% due 11/29/2005         2,295,782
1,050,000                    Federal Home Loan Bank Board, 6.75% due 4/10/2006          1,066,401
1,000,000                    Federal Home Loan Bank Board, 6.37% due 9/26/2007          976,720
475,000                      Federal Home Loan Bank Board, 6.075% due 1/2/2008          454,589
1,465,000                    Federal Home Loan Bank Board, 5.67% due 2/26/2009          1,353,528
3,000,000                    Federal Home Loan Bank Board, 5.70% due 3/3/2009           2,803,110
3,000,000                    Federal Home Loan Bank Board, 5.985% due 4/9/2009          2,849,955
1,973,936                    Federal Home Loan Bank Board, Pool# W10002, 6.775% due     1,982,345
                             11/1/2003
679,839                      Federal Home Loan Mortgage Corporation CMO Series 1216     679,411
                             Class E, 7.00% due 3/15/2005
500,000                      Federal Home Loan Mortgage Corporation CMO Series 1476     473,125
                             Class J, 6.00% due 2/15/2008
1,681,976                    Federal Home Loan Mortgage Corporation CMO Series 1900     1,683,018
                             Class L, 7.50% due 11/15/2021
1,000,000                    Federal Home Loan Mortgage Corporation CMO Series 1464     995,620
                             Class G, 7.25% due 12/15/2021
377,576                      Federal Home Loan Mortgage Corporation, Pool# 141016,      396,727
                             9.25% due 11/1/2016
156,005                      Federal Home Loan Mortgage Corporation, Pool# 160043,      160,735
                             8.75% due 4/1/2008
231,802                      Federal Home Loan Mortgage Corporation, Pool# 181730,      237,944
                             8.50% due 5/1/2008
198,318                      Federal Home Loan Mortgage Corporation, Pool# 200075,      199,605
                             9.00% due 9/1/2004
103,478                      Federal Home Loan Mortgage Corporation, Pool# 213924,      103,482
                             9.00% due 10/1/2001
210,386                      Federal Home Loan Mortgage Corporation, Pool# 216502,      212,659
                             8.00% due 4/1/2002
102,362                      Federal Home Loan Mortgage Corporation, Pool# 252986,      109,869
                             10.75% due 4/1/2010
170,983                      Federal Home Loan Mortgage Corporation, Pool# 256764,      176,167
                             8.75% due 10/1/2014
141,947                      Federal Home Loan Mortgage Corporation, Pool# 260486,      146,758
                             9.00% due 1/1/2010
467,277                      Federal Home Loan Mortgage Corporation, Pool# 291880,      484,193
                             8.25% due 5/1/2017
129,343                      Federal Home Loan Mortgage Corporation, Pool# 294817,      137,428
                             9.75% due 1/1/2017
118,630                      Federal Home Loan Mortgage Corporation, Pool# 298107,      127,993
                             10.25% due 8/1/2017
231,113                      Federal Home Loan Mortgage Corporation, Pool# 770297,      225,627
                             6.25% (adjustable rate) due 6/1/2018
482,381                      Federal Home Loan Mortgage Corporation, Pool# C90041,      470,770
                             6.50% due 11/1/2013
186,363                      Federal Home Loan Mortgage Corporation, Pool# D06907,      193,515
                             9.00% due 4/1/2017
127,066                      Federal Home Loan Mortgage Corporation, Pool# D06908,      133,512
                             9.50% due 9/1/2017
666,639                      Federal Home Loan Mortgage Corporation, Pool# E00107,      679,638
                             8.00% due 7/1/2007
435,015                      Federal Home Loan Mortgage Corporation, Pool# E49074,      430,017
                             6.50% due 7/1/2008
638,285                      Federal Home Loan Mortgage Corporation, Pool# E61778,      631,672
                             6.50% due 4/1/2008
363,621                      Federal Home Loan Mortgage Corporation, Pool# E65962,      364,225
                             7.00% due 5/1/2008
1,614,946                    Federal Home Loan Mortgage Corporation, Pool# M80406,      1,619,144
                             7.00% due 1/1/2003
1,900,000                    Federal National Mortgage Association CMO Series 1993-12   1,900,000
                             Class EC, 7.50% due 9/25/2001
391,000                      Federal National Mortgage Association, Benchmark Note,     372,549
                             5.125% due 2/13/2004
1,150,000                    Federal National Mortgage Association CMO Series           1,148,919
                             1992-145 Class L, 7.50% due 1/25/2006
1,500,000                    Federal National Mortgage Association CMO Series 1993-35   1,470,930
                             Class G, 6.50% due 11/25/2006
850,000                      Federal National Mortgage Association CMO Series 1992-22   849,464
                             Class HC, 7.00% due 3/25/2007
2,000,000                    Federal National Mortgage Association CMO Series           1,992,500
                             1991-134 Class KE, 7.00% due 5/25/2008
750,000                      Federal National Mortgage Association CMO Series           745,312
                             1993-101 Class PJ, 7.00% due 6/25/2008
1,250,000                    Federal National Mortgage Association CMO Series           1,223,037
                             1993-191 Class G, 6.00% due 10/25/2008
1,000,000                    Federal National Mortgage Association CMO Series           986,870
                             1993-112 Class EC, 7.00% due 1/25/2011
388,093                      Federal National Mortgage Association CMO Series 1992-64   387,969
                             Class G, 7.00% due 12/25/2018
620,000                      Federal National Mortgage Association CMO Series 1994-41   615,152
                             Class PG, 6.25% due 1/25/2021
100,000                      Federal National Mortgage Association CMO Series           101,250
                             1992-135 Class J, 7.50% due 2/25/2021
640,000                      Federal National Mortgage Association CMO Series           628,000
                             1993-120 Class H, 6.50% due 11/25/2021
793,029                      Federal National Mortgage Association CMO Series           776,423
                             1993-168 Class PK, 6.75% due 8/25/2022
978,000                      Federal National Mortgage Association CMO Series 1993-32   908,924
                             Class H, 6.00% due 3/25/2023
538,692                      Federal National Mortgage Association CMO Series 1994-36   535,826
                             Class UA, 7.00% due 8/25/2023
1,000,000                    Federal National Mortgage Association CMO Series 1998-49   964,370
                             Class TD, 6.25% due 12/18/2023
603,279                      Federal National Mortgage Association, Pool# 008307,       617,318
                             8.00% due 5/1/2008
82,105                       Federal National Mortgage Association, Pool# 019535,       87,812
                             10.25% due 7/1/2008
756,120                      Federal National Mortgage Association, Pool# 033356,       797,532
                             9.25% due 8/1/2016
103,976                      Federal National Mortgage Association, Pool# 040526,       109,640
                             9.25% due 1/1/2017
611,785                      Federal National Mortgage Association, Pool# 044003,       626,945
                             8.00% due 6/1/2017
449,979                      Federal National Mortgage Association, Pool# 050811,       456,665
                             7.50% due 12/1/2012
170,202                      Federal National Mortgage Association, Pool# 058816,       175,359
                             9.25% due 12/1/2002
171,343                      Federal National Mortgage Association, Pool# 063791,       173,564
                             8.25% due 7/1/2002
396,831                      Federal National Mortgage Association, Pool# 064011,       408,855
                             9.25% due 7/1/2003
5,000,000                    Federal National Mortgage Association, Pool# 073040,       5,068,310
                             7.625% due 9/1/2001
3,765,023                    Federal National Mortgage Association, Pool# 073798,       3,790,491
                             6.94% due 12/1/2006
314,166                      Federal National Mortgage Association, Pool# 076388,       331,467
                             9.25% due 9/1/2018
102,881                      Federal National Mortgage Association, Pool# 077725,       109,295
                             9.75% due 10/1/2018
219,299                      Federal National Mortgage Association, Pool# 112067,       232,573
                             9.50% due 10/1/2016
817,027                      Federal National Mortgage Association, Pool# 156156,       849,356
                             8.50% due 4/1/2021
474,603                      Federal National Mortgage Association, Pool# 190555,       472,240
                             7.00% due 1/1/2014
465,918                      Federal National Mortgage Association, Pool# 190703,       465,988
                             7.00% due 3/1/2009
1,056,089                    Federal National Mortgage Association, Pool# 190836,       1,056,089
                             7.00% due 6/1/2009
750,180                      Federal National Mortgage Association, Pool# 250387,       749,828
                             7.00% due 11/1/2010
511,150                      Federal National Mortgage Association, Pool# 250481,       492,621
                             6.50% due 11/1/2015
1,944,028                    Federal National Mortgage Association, Pool# 252648,       1,881,625
                             6.50% due 5/1/2022
1,200,771                    Federal National Mortgage Association, Pool# 252787,       1,202,452
                             7.00% due 8/1/2006
955,595                      Federal National Mortgage Association, Pool# 303383,       955,891
                             7.00% due 12/1/2009
897,348                      Federal National Mortgage Association, Pool# 312663,       910,808
                             7.50% due 6/1/2010
929,002                      Federal National Mortgage Association, Pool# 334996,       928,565
                             7.00% due 2/1/2011
1,517,313                    Federal National Mortgage Association, Pool# 342947,       1,512,336
                             7.25% due 4/1/2024
504,944                      Federal National Mortgage Association, Pool# 345775,       524,925
                             8.50% due 12/1/2024
550,327                      Federal National Mortgage Association, Pool# 373942,       543,453
                             6.50% due 12/1/2008
522,037                      Federal National Mortgage Association, Pool# 400569,       512,197
                             6.00% due 4/1/2009
1,102,082                    Federal National Mortgage Association, Pool# 406384,       1,139,156
                             8.25% due 12/1/2024
582,105                      Government National Mortgage Association, Pool# 000623,    596,436
                             8.00% due 9/20/2016
657,414                      Government National Mortgage Association, Pool# 016944,    669,175
                             7.50% due 5/15/2007
184,788                      Government National Mortgage Association, Pool# 296697,    196,650
                             9.50% due 10/15/2005
296,588                      Government National Mortgage Association, Pool# 306636,    304,744
                             8.25% due 12/15/2006
1,377,598                    Government National Mortgage Association, Pool# 313403,    1,342,538
                             6.80% due 5/20/2023
1,958,120                    Government National Mortgage Association, Pool# 357090,    1,900,766
                             6.80% due 4/20/2025
554,605                      Government National Mortgage Association, Pool# 362865,    562,231
                             8.00% due 7/15/2003
691,765                      Government National Mortgage Association, Pool# 430150,    687,116
                             7.25% due 12/15/2026
1,194,081                    Government National Mortgage Association, Pool# 447040,    1,209,007
                             7.75% due 5/15/2027
708,208                      Government National Mortgage Association, Pool# 453928,    700,021
                             7.00% due 7/15/2017
346,341                      Government National Mortgage Association, Pool# 780063,    347,747
                             7.00% due 9/15/2008
796,169                      Government National Mortgage Association, Pool# 780448,    783,646
                             6.50% due 8/15/2011
800,000                      Tennessee Valley Authority, 8.375% due 10/1/1999           800,000

                             Total U.S. Government Agencies (Cost $84,473,881)          83,450,846

                             United States Treasury (35.90%)
1,500,000                    United States Treasury Notes, 7.50% due 10/31/1999         1,502,805
3,200,000                    United States Treasury Notes, 6.25% due 4/30/2001          3,231,264
10,000,000                   United States Treasury Notes, 7.50% due 11/15/2001         10,357,800
3,200,000                    United States Treasury Notes, 6.25% due 2/15/2003          3,241,504
5,000,000                    United States Treasury Notes, 5.75% due 8/15/2003          4,984,350
9,750,000                    United States Treasury Notes, 7.25% due 5/15/2004          10,280,107
3,700,000                    United States Treasury Notes, 7.25% due 8/15/2004          3,907,533
1,900,000                    United States Treasury Notes, 6.50% due 5/15/2005          1,945,125
4,000,000                    United States Treasury Notes, 7.00% due 7/15/2006          4,201,240

                             Total United States Treasury (Cost $43,274,092)            43,651,728

                             TOTAL INVESTMENTS  (105%) (Cost $127,747,973)              $ 127,102,574

                             See notes to financial statements.
</TABLE>

<TABLE>
<CAPTION>

Schedule of Investments Thornburg Limited Term Income Fund
September 30, 1999 CUSIPS: Class A - 885-215-509, Class C - 885-215-764, Class I - 885-215-681
NASDAQ Symbols: Class A - THIFX, Class C - THICX (Proposed), Class I - THIIX (Proposed)

U.S. TREASURY
SECURITIES - 8.70%
<S>                  <C>                                                 <C>               <C>
750,000              United States Treasury Notes, 8.00% due 5/15/2001    Aaa/AAA          $777,068
500,000              United States Treasury Notes, 6.375% due 8/15/2002   Aaa/AAA          508,360
500,000              United States Treasury Notes, 6.25% due 2/15/2003    Aaa/AAA          506,485
1,000,000            United States Treasury Notes, 4.25% due 11/15/2003   Aaa/AAA          943,438
1,100,000            United States Treasury Notes, 6.50% due 5/15/2005    Aaa/AAA          1,126,125
1,000,000            United States Treasury Notes, 5.625% due 5/15/2008   Aaa/AAA          970,620

                     Total U.S. Treasury Securities (Cost $4,743,077)                      4,832,096

U. S. GOVERNMENT
AGENCIES - 6.00%
300,000              Federal Home Loan Mortgage Corp., Consolidated       Aaa/NA           281,811
                     Bond, 5.835% due 7/15/2008
419,891              Federal Home Loan Mortgage Corp., CMO Series 1914    NR/NR            410,179
                     AC, 7.00% due 12/15/2011
123,086              Federal Home Loan Mortgage Corp., Pool# 214180,      Aaa/AAA          124,015
                     9.75% due 11/1/2001
189,713              Federal Home Loan Mortgage Corp., Pool# 850082,      Aaa/AAA          193,391
                     9.00% due 10/1/2005
685,000              Federal National Mortgage Association, CMO Series    NR/NR            685,212
                     97-13 D, 7.00% due 8/18/2006
200,000              Federal National Mortgage Association, CMO Series    NR/NR            196,186
                     1993-140, Class J, 6.65% due6/25/2013
600,000              Federal National Mortgage Association, CMO Series    NR/NR            592,872
                     G94-7 B, 7.50% due 5/17/2024
640,042              Federal National Mortgage Association, Pool#         Aaa/AAA          628,739
                     020155, 7.491% due 8/1/2014
193,320              Federal National Mortgage Association, Pool#         Aaa/AAA          198,122
                     297033, 8.00% due 12/1/2009
46,755               Government National Mortgage Association, Pool#      Aaa/AAA          47,054
                     827148, 6.375% due 2/20/2024

                     Total U. S. Government Agencies (Cost $3,397,480)                     3,357,581

MORTGAGE BACKED
SECURITIES - 0.50%
279,661              GE Capital Mortgage Services, Series 92-13 G2,       Aaa/AAA          275,078
                     7.00% due 1/1/2008

                     Total Mortgage Backed Securities (Cost $279,661)                      275,078

CORPORATE BONDS -
31.60%
BANKS
1,000,000            Mercantile Bancorpation Incorporated, Subordinated   A3/BBB           1,003,571
                     Note, 7.30% due 6/15/2007
1,350,000            Westdeutsche Landesbank Giroze, 2008 Subordinated    Aa1/AA+          1,231,821
                     Note, 6.05% due 1/15/2009

                                                                                           2,235,392
INDUSTRIALS
50,000               AMR Corporation Delaware, 9.50% due 5/15/2001        Baa2/BBB-        51,774
100,000              AT&T Canada Inc., 7.65% due 9/15/2006                Baa3/BBB         100,261
1,000,000            Burlington Northern Santa Fe, Certificate Series     NA/NA            998,530
                     A, 5.38% due 5/1/2000
2,000,000            Computer Associates International Incorporated,      Baa1/BBB+        1,870,700
                     2005 Senior Note, 6.375% due4/15/2005
50,000               Grand Metropolitan Investment Corporation, 0% due    A1/A+            37,088
                     1/6/2004
1,000,000            Ingersoll Rand Company, 6.46% due 11/19/2003         A3/A-            998,350
515,000              International Business Machs, Tranche Trust 00036,   A1/A+            465,792
                     5.40% due 10/1/2008
1,000,000            Johnson & Johnson, 6.625% due 9/1/2009               Aaa/AAA          989,840
1,000,000            Occidental Petroleum Corporation, Senior Note,       Baa3/BBB         987,770
                     7.375% due 11/15/2008
700,000              Raytheon Company, 6.30% due 3/15/2005                Baa1/BBB         675,003
500,000              Sun Microsystems Inc., Senior Note, 7.50% due        Baa1/BBB+        505,082
                     8/15/2006
125,000              Valassis Communications, 9.55% due 12/1/2003         Baa3/BBB-        134,683
1,400,000            Valassis Communications Incorporated, 2009 Senior    Baa3/BBB-        1,304,265
                     Note, 6.625% due 1/15/2009
500,000              Waste Management Incorporated Delaware, 144-A,       Baa2/BBB         435,858
                     6.875% due 5/15/2009
879,000              Wheeling Pittsburgh Corporation, 9.375% due          Aaa/AAA          924,049
                     11/15/2003
185,000              WMX Technologies Inc., 7.00% due 5/15/2005           Baa1/BBB         170,992

                                                                                           10,650,037
INSURANCE
900,000              Old Republic International Corporation, Debenture,   Aa3/AA-          874,359
                     7.00% due 6/15/2007

RENTAL AUTOMOTIVE
EQUIPMENT
100,000              Hertz Corporation, 7.00% due 7/15/2003               Baa2/BBB+        99,731

UTILITIES
750,000              Commonwealth Edison Company, 6.40% due 10/15/2005    Baa2/BBB         716,985
75,000               Detroit Edison Company, 7.40% due 1/15/2003          NA/AAA           76,753
85,000               Niagara Mohawk Power Corporation, 8.00% due          NA/NA            89,238
                     6/1/2004
110,000              Niagara Mohawk Power Corporation, 6.625% due         Aaa/AAA          110,515
                     7/1/2005
150,000              Pacific Gas & Electric Company, 7.875% due           NR/NA            155,027
                     3/1/2002
50,000               Pennsylvania Power and Light Company, 6.55% due      Aaa/A-           48,352
                     3/1/2006
70,000               Philadelphia Electric Company, Refunding Mortgage,   Aaa/AAA          72,385
                     8.00% due 4/1/2002 (Insured:MBIA)
125,000              Public Service Electric & Gas Company, First         NR/AAA           122,926
                     Refunding Mortgage Series Railroad,6.125% due
                     8/1/2002 (Insured: MBIA)
175,000              Public Service Electric & Gas Company, 6.75% due     NR/AAA           170,566
                     3/1/2006
70,000               Texas Utilities Electric Company, 8.125% due         Aaa/AAA          72,178
                     2/1/2002
195,000              Texas Utilities Electric Company, 6.75% due          Aaa/AAA          197,158
                     7/1/2005
50,000               Virginia Electric & Power Company, First Refunding   NR/NA            52,383
                     Mortgage, 8.00% due 3/1/2004

                                                                                           1,884,466
YANKEE
2,150,000            Dao Heng Bank Group, 7.75% due 1/24/2007 (U.S.       Baa1/BBB         1,921,354
                     Dollar)

                     Total Corporate Bonds (Cost $18,085,298)                              17,665,339

TAXABLE MUNICIPAL
BONDS - 48.10%
1,500,000            Austin Texas General Obligation, 6.90% due           Aa2/AA           1,525,410
                     3/1/2002
185,000              Baltimore Economic Development Authority, 8.50%      A3/BBB+          189,747
                     due 8/1/2002 (Arcade LP Project)
30,000               Beaumont Housing Multi Family Mortgage Series        Aaa/NR           30,300
                     1995-B, 7.50% due 6/15/2000(Insured: FHA)
60,000               Bellingham Washington Civic Center Development,      NR/NR            60,617
                     Series A, 6.97% due 8/1/2000
900,000              California Maritime Infrastructure, Taxable San      A3/A             863,541
                     Diego, 6.63% due 11/1/2009
1,750,000            Capital Projects Finance Authority Florida           NR/NR            1,747,987
                     Revenue, Series B, 8.00% due12/1/2001
1,025,000            Connecticut State Development Authority, 8.55% due   NR/A+            1,085,188
                     8/15/2005
755,000              Dallas County Texas Single Family Mortgage,          A1/NR            745,034
                     Taxable Refunding, 6.85% due12/1/2008
900,000              Denver City and County Special Facilities, Taxable   Aaa/AAA          900,414
                     Refunding & ImprovementSeries B, 7.15% due
                     1/1/2008
500,000              Duke University Revenue, 6.19% due 6/1/2004 (Duke    Aa3/AA           491,035
                     University Hospital Project A)
115,000              Duquesne Pennsylvania General Obligation, 6.75%      Aaa/AAA          115,919
                     due 12/15/2001 (Insured: MBIA)
125,000              Duquesne Pennsylvania General Obligation, 6.75%      Aaa/AAA          125,886
                     due 12/15/2002 (Insured: MBIA)
130,000              Duquesne Pennsylvania General Obligation, 6.95%      Aaa/AAA          131,062
                     due 12/15/2003 (Insured: MBIA)
985,000              East Baton Rouge Louisiana Mortgage Finance,         Aaa/NR           962,975
                     Series C-2 Tax Refunding Mortgage,6.75% due
                     4/1/2005
370,000              Galveston Texas Wharves & Term Revenue, Taxable      Aaa/AAA          346,342
                     Refunding Series B, 5.87% due2/1/2006
320,000              Georgia Municipal Electric Authority Power           A3/A             317,722
                     Revenue, Taxable Series One, 7.00%due 1/1/2006
2,000,000            Greater Valley Medical Building Partnership,         Aa3/NR           2,013,220
                     Series 1996, 6.95% due 3/1/2021 put3/1/01 (LOC:
                     Krediet Bank)
500,000              Gulfport Mississippi Hospital Facility Revenue,      Aaa/AAA          529,755
                     Memorial Hospital Gulfport B,8.00% due 7/1/2006
1,120,000            Halifax Hospital Medical Center Florida Health,      NR/A             1,109,853
                     6.50% due 4/1/2002
845,000              Idaho Housing Multi Family Housing Revenue Series    A/NR             889,134
                     94-B, 8.15% due 7/1/2004
135,000              Illinois Housing Development Authority, Taxable      A1/A+            138,384
                     Multi Family Pg Series 2, 7.85%due 3/1/2005
405,000              King County Washington General Obligation, 7.55%     Aa1/AA+          419,013
                     due 12/1/2005
100,000              Kiryas Joel Village, New York General Obligation     Baa3/NR          100,629
                     Series B, 8.50% due 1/1/2000
210,000              Lake City Utilities Revenue, Taxable Refunding       Aaa/NR           206,276
                     Series B, 6.40% due 7/1/2004
255,000              Lake City Utilities Revenue, Taxable Refunding       Aaa/NR           246,139
                     Series B, 6.60% due 7/1/2007
260,000              Lake City Utilities Revenue, Taxable Refunding       Aaa/NR           247,697
                     Series B, 6.60% due 7/1/2008
1,000,000            Los Angeles County Pension Obligation, 8.30% due     Aaa/AAA          1,047,930
                     6/30/2002 (Insured: FSA)
1,225,000            Louisiana Public Facilities Authority Revenue,       Aaa/NR           1,234,237
                     Taxable Single Family MortgageSeries, 7.05% due
                     8/1/2017
110,000              Maine Municipal Bond Bank Special Obligation,        NR/A+            115,196
                     Taxable Series A, 8.00% due11/1/2002
690,000              Maryland State Economic Development Corporation,     NR/NR            681,534
                     Taxable Maryland TechDevelopment Center Project,
                     7.25% due 6/1/2008
240,000              Mckeesport Pennsylvania, Taxable Series B, 6.60%     Aaa/AAA          235,812
                     due 3/1/2006
280,000              Miami Beach Housing Authority Revenue, 6.75% due     A3/NR            281,159
                     3/1/2003
200,000              Missouri High Education Student Loan, Series B,      Aaa/NR           201,570
                     6.80% due 2/15/2001
75,000               Mobile Alabama United States Government Guaranteed   Aaa*/AAA*        75,771
                     Notes, 6.99% due 8/1/2000
220,000              New Jersey Economic Development Authority Series     Aa3/AA-          221,903
                     B, 7.10% due 9/15/2002
95,000               New Jersey State Housing & Mortgage Financing        NR/A+            96,378
                     Agency Series E, 7.95% due11/1/2000
2,370,000            New Orleans Home Mortgage Authority Single Family    Aaa/AAA          573,777
                     Mortgage Revenue RefundingSeries 1994-A, 0% due
                     10/1/2015 (Insured: MBIA)
200,000              New York City Series 1991, 10.50% due 11/15/2013     Aaa/AAA          220,362
                     pre-refunded 11/15/01
250,000              New York General Obligation, Taxable Series K,       A3/A-            250,380
                     6.00% due 8/1/2000
500,000              New York Mortgage Agency Revenue, Taxable Mortgage   Aaa/NR           499,160
                     20th Series, 6.70% due10/1/2004
1,000,000            New York Power Authority Revenue & General,          Aa3/AA-          999,680
                     Taxable Series D, 6.17% due2/15/2001
100,000              New York Taxable Prerefunded Series D, 10.00% due    A3/A-            109,257
                     8/1/2005
1,000,000            Oklahoma City Airport Trust, Taxable Senior Lien     Aa2/AA           1,003,160
                     19th Series, 6.15% due 7/1/2000
1,000,000            Pennsylvania Housing Finance Agency, 8.40% due       Aa2/AA+          1,029,490
                     4/1/2010
1,085,000            Rockwall Texas Independent School District,          NR/AAA           572,251
                     Capital Appreciation RefundingTaxable, 0% due
                     8/15/2008
1,020,000            Santa Fe New Mexico Civic Housing Authority,         Aaa/AAA          994,143
                     Tuscany Ser B, 6.71% due 8/1/2012
145,000              Texas Department Housing & Community, Affairs        A1/A+            147,620
                     Single Family Series B, 9.50% due3/1/2016
35,000               Tucson & Pima County IDA SFMR Series A, 7.00% due    A1/NR            35,237
                     12/1/2003
505,000              Virginia Housing Development Authority, Taxable      NR/AA+           506,798
                     Rental Housing Series I, 7.30%due 2/1/2008  (when
                     issued)
250,000              Virginia Housing Development Multi Family, Taxable   Aa1/AA+          251,779
                     Series A, 7.125% due11/1/2003

                     Total Taxable Municipal Bonds (Cost $26,969,349)                      26,923,863

FOREIGN SECURITIES
- - 2.70%
2,000,000            British Columbia Province, 9.00% due 6/21/2004       Aa2/AA-          1,528,605
                     (Canadian Dollars)

                     Total Foreign Securities (Cost $1,447,027)                            1,528,605

COMMERCIAL PAPER -
7.30%
500,000              American General Finance, 5.32% due 10/5/1999        /                499,705
400,000              American General Finance, 5.26% due 10/7/1999        /                399,649
1,600,000            Ford Motor Credit Corp., 5.22% due 10/1/1999         /                1,600,000
1,600,000            Merrill Lynch Inc., 5.30% due 10/4/1999              PRIM1/A-1+       1,599,293

                     Total Commercial Paper (Cost $4,098,647)                              4,098,647

                     TOTAL INVESTMENTS  (105%) (Cost $59,020,539)                          $ 58,681,209

                     See notes to financial statements.
</TABLE>




Independent Auditor's Report

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 Limited Term U.S. Government Fund
and Thornburg  Limited Term Income Fund,  series of Thornburg  Investment  Trust
(hereafter referred to as the "Funds") 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 Funds'  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.  PricewaterhouseCoopers  LLP 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
GOVERNMENT FUND
Index Comparisons
Compares performance of the Government Fund Class A shares and Class C shares to
the Lehman Brothers  Intermediate  Government Bond Index, and the Consumer Price
Index for the periods  ended  September  30, 1999.  On September  30, 1999,  the
weighted average  securities ratings of the Index and the Fund were AAA and AAA,
respectively, and the weighted average portfolio maturities of the Index and the
Fund were 3.9 years and 4.2 years, respectively. Class A shares became available
on November 16, 1987, and Class C shares became  available on September 1, 1994.
Past  performance  of the  Index  and the Fund may not be  indicative  of future
performance.










Average Annual Total Returns (periods ending 9/30/99)(at max. offering price)
A Shares
One Year:                          (1.01)%
Five Years:                         5.77%
Ten Years:                          6.47%
From Inception (11/16/87):          6.65%













Average Annual Total Returns (periods ending 9/30/99)
C Shares
One Year:                    0.13%
Five Years:                  5.63%
From Inception (9/1/94):     5.43%
INCOME FUND
Index Comparisons
Compares performance of the Income Fund Class A shares and Class C shares to the
Lehman Brothers  Intermediate  Government  Corporate Bond Index and the Consumer
Price Index for the periods ended September 30, 1999. On September 30, 1999, the
weighted  average  securities  ratings  of the Index and the Fund were A and AA,
respectively, and the weighted average portfolio maturities of the Index and the
Fund were 4.3 years and 4.8 years, respectively. Class A shares became available
on October 1, 1992 and Class C shares  became  available  on  September 1, 1994.
Past  performance  of the  Index  and the Fund may not be  indicative  of future
performance.












Average Annual Total Returns (periods ending 9/30/99)(at max. offering price)
A Shares
One Year                           (0.50)%
Five Years:                         6.12%
From Inception (10/1/92):           5.66%













Average Annual Total Returns (periods ending 9/30/99)
C Shares
One Year                            0.68%
Five Years:                         6.05%
From Inception (9/1/94):            5.80%

Y2k Update
We Are Ready for the Year 2000

Dear Shareholder,

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

Thornburg Limited Term U.S. Government Fund - Class A
Outperformed Taxable Money Market Funds
Donoghue's Taxable
Money Market Fund Average
$61,647

Thornburg Limited Term
U.S. Government Fund
$89,958
Return from a $100,000 Investment 9/30/89 to 9/30/99

The chart above is for the Funds' Class A Shares only.  Class C Shares and Class
I Shares have different  sales charges and expenses.  See the inside front cover
page for the 30-day  SEC yield and the total  returns  at the  maximum  offering
prices for one year, five years, and ten years for the Class A & C shares of the
Fund.  Return for the money fund average is based upon 30-day  yield  quotations
for taxable  money  funds as quoted in  "Donoghue's  Money Fund  Report" for the
months  covered by this  analysis.  The return for Limited Term U.S.  Government
Fund is based upon the dividends  paid for the months  covered by this analysis,
the  beginning  offering  price of $12.44 and the  ending  NAV of $12.06.  These
investments  returned the $100,000 initial investment in addition to the amounts
shown  above.  This  analysis  assumes  that the  dividends  from  each of these
investment  vehicles were  reinvested and compounded  monthly.  Most money funds
declare  dividends  daily and pay them monthly.  LTUSX also  declares  dividends
daily and pays them monthly.  The average money market fund increases  shown may
differ from the return of a  particular  fund.  It is not  possible to invest in
these  money  fund  averages.  Note  1:  Future  performance  of  any  of  these
investments may bear no relationship to prior performance. Note 2: This analysis
does not take into account the effect,  if any, caused by taxes. Note 3: The net
asset value of the money funds did not fluctuate. Money funds seek to maintain a
constant  net  asset  value.  The net  asset  value  of the  Limited  Term  U.S.
Government  Fund did vary from time to time, and it will continue to vary in the
future.  The analysis assumes that the investor  receives the net asset value of
shares owned,  plus accrued  income,  at redemption.  Due to the effect of sales
commissions, the net asset value of the Limited Term U.S. Government Fund shares
is less than the offering price of the shares.  Redemptions are made at the then
current  net  asset  value  and you may have a gain or a loss  when  you  redeem
shares.

Thornburg Limited Term Income Fund - Class A
Outperformed Taxable Money Market Funds
Donoghue's Taxable
Money Market Fund Average
$27,776

Thornburg Limited Term
Income Fund
$36,641
Return from a $100,000 Investment 9/30/94 to 9/30/99

The chart above is for the Fund's Class A Shares only.  Class C Shares and Class
I Shares have different  sales charges and expenses.  See the inside front cover
page for the 30-day  SEC yield and the total  returns  at the  maximum  offering
prices for one year, five years,  and since inception for the Class A & C shares
of the  Fund.  Return  for the money  fund  average  is based  upon 30 day yield
quotations for taxable money funds as quoted in  "Donoghue's  Money Fund Report"
for the months covered by this analysis. The return for Limited Term Income Fund
is based upon the dividends paid for the months  covered by this  analysis,  the
beginning offering price of $12.44 per share, respectively and the ending NAV of
$11.93 per share. These investments  returned the $100,000 initial investment in
addition to the amounts shown above.  This  analysis  assumes that the dividends
from each of these investment  vehicles were reinvested and compounded  monthly.
Most  money  funds  declare  dividends  daily and pay them  monthly.  THIFX also
declares  dividends  daily and pays them monthly.  The average money market fund
increases  shown may differ  from the  return of a  particular  fund.  It is not
possible to invest in these money fund averages.  Note 1: Future  performance of
any of these investments may bear no relationship to prior performance.  Note 2:
This  analysis does not take into account the effect,  if any,  caused by taxes.
Note 3: The net asset  value of the money funds did not  fluctuate.  Money funds
seek to maintain a constant net asset value. The net asset value of Limited Term
Income  Fund did vary from  time to time,  and it will  continue  to vary in the
future.  The analysis assumes that the investor  receives the net asset value of
shares owned,  plus accrued  income,  at redemption.  Due to the effect of sales
commissions, the net asset value of the Limited Term Income Fund shares are less
than the offering price of the shares.  Redemptions are made at the then current
net asset value and you may have a gain or a loss when you redeem shares.






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