Item 12(a)(2)
Exhibit 99.CERT
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CERTIFICATION
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I, Brian J. McMahon, certify that:
1. I have reviewed this report on Form N-CSR of Thornburg
Investment Trust;
2. Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to
the period covered by this report;
3. Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in all
material respects the financial condition, results of operations,
changes in net assets, and cash flows (if the financial statements are
required to include a statement of cash flows) of the registrant as
of, and for, the periods presented in this report;
4. The registrant's other certifying officer(s) and I are
responsible for establishing and maintaining disclosure controls and
procedures (as defined in Rule 30a-3(c) under the Investment Company
Act of 1940) and internal control over financial reporting (as defined
in Rule 30a-3(d) under the Investment Company Act of 1940) for the
registrant and have:
(a) Designed such disclosure controls and procedures, or
caused such disclosure controls and procedures to be designed under
our supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to
us by others within those entities, particularly during the period in
which this report is being prepared;
(b) Designed such internal control over financial reporting, or
caused such internal control over financial reporting to be designed
under our supervision, to provide reasonable assurance regarding the
reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with generally accepted
accounting principles;
(c) Evaluated the effectiveness of the registrant's disclosure
controls and procedures and presented in this report our conclusions
about the effectiveness of the disclosure controls and procedures, as
of a date within 90 days prior to the filing date of this report based
on such evaluation; and
(d) Disclosed in this report any change in the registrant's
internal control over financial reporting that occurred during the
second fiscal quarter of the period covered by this report that has
materially affected, or is reasonably likely to materially affect, the
registrant's internal control over financial reporting; and
5. The registrant's other certifying officer(s) and I have
disclosed to the registrant's auditors and the audit committee of the
registrant's board of directors (or persons performing the equivalent
functions):
(a) All significant deficiencies and material weaknesses in the
design or operation of internal control over financial reporting which
are reasonably likely to adversely affect the registrant's ability to
record, process, summarize, and report financial information; and
(b) Any fraud, whether or not material, that involves
management or other employees who have a significant role in the
registrant's internal control over financial reporting.
Date: June 23, 2008
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/s/ BRIAN J. MCMAHON
--------------------
Brian J. McMahon
President and principal executive officer
Item 12(a)(2)
Exhibit 99.CERT
---------------
CERTIFICATION
-------------
I, George T. Strickland, certify that:
1. I have reviewed this report on Form N-CSR of Thornburg
Investment Trust;
2. Based on my knowledge, this report does not contain any
untrue statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to
the period covered by this report;
3. Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in all
material respects the financial condition, results of operations,
changes in net assets, and cash flows (if the financial statements are
required to include a statement of cash flows) of the registrant as
of, and for, the periods presented in this report;
4. The registrant's other certifying officer(s) and I are
responsible for establishing and maintaining disclosure controls and
procedures (as defined in Rule 30a-3(c) under the Investment Company
Act of 1940) and internal control over financial reporting (as defined
in Rule 30a-3(d) under the Investment Company Act of 1940) for the
registrant and have:
(a) Designed such disclosure controls and procedures, or caused
such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to
us by others within those entities, particularly during the period in
which this report is being prepared;
(b) Designed such internal control over financial reporting, or
caused such internal control over financial reporting to be designed
under our supervision, to provide reasonable assurance regarding the
reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with generally accepted
accounting principles;
(c) Evaluated the effectiveness of the registrant's disclosure
controls and procedures and presented in this report our conclusions
about the effectiveness of the disclosure controls and procedures, as
of a date within 90 days prior to the filing date of this report based
on such evaluation; and
(d) Disclosed in this report any change in the registrant's
internal control over financial reporting that occurred during the
second fiscal quarter of the period covered by this report that has
materially affected, or is reasonably likely to materially affect, the
registrant's internal control over financial reporting; and
5. The registrant's other certifying officer(s) and I have
disclosed to the registrant's auditors and the audit committee of the
registrant's board of directors (or persons performing the equivalent
functions):
(e) All significant deficiencies and material weaknesses in
the design or operation of internal control over financial reporting
which are reasonably likely to adversely affect the registrant's
ability to record, process, summarize, and report financial
information; and
6. Any fraud, whether or not material, that involves management
or other employees who have a significant role in the registrant's
internal control over financial reporting.
Date: June 23, 2008
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/s/ GEORGE T. STRICKLAND
------------------------
George T. Strickland
Treasurer and principal financial officer