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0000816153
THORNBURG INVESTMENT TRUST
<div id="xdx_A81_eoef--SupplementToProspectusTextBlock_zvlUfkYAxLBd"></div>
<p style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><b>Supplement dated <span class="xdx_phnt_RGlzY2xvc3VyZSAtIEZvcm0gTi0xQSBDb3ZlcgA_" id="xdx_90F_edei--DocumentPeriodEndDate_c20261001__20261001_z6a7MHL6hk51">October
1, 2026</span></b></p>
<p style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><b> </b></p>
<p style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0; text-align: center"><b>to the Summary Prospectus and Prospectus, each dated
<span id="xdx_90A_eoef--ProspectusDate_c20261001__20261001_zIuCHDnOI8Cj">February 1, 2026</span>, as supplemented, applicable to the Class A, C, I and R6 shares of Thornburg International Growth Fund (the “Fund”),
a series of the Trust (the “Retail Prospectus”)</b></p>
<p style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0; text-align: center"><b>and</b></p>
<p style="font: 10pt Arial, Helvetica, Sans-Serif; text-align: center; margin-top: 12pt; margin-bottom: 0"><b>to the Summary Prospectus and Prospectus, each dated
February 1, 2026, as supplemented, applicable to the Class R3, R4 and R5 shares of the Fund (the “Retirement Prospectus”)</b></p>
<hr style="border-width: 0; color: Gray; background-color: Gray; height: 1px; width: 100%; margin-top: 3pt; margin-bottom: 3pt"/>
<p style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0; text-align: justify">The Board of Trustees of the Trust and Thornburg Investment
Management, Inc., the Fund’s investment adviser, have agreed to amend the Fund’s contractual fee waiver/expense reimbursement
arrangement to further reduce the Fund’s total annual operating expenses. As a result, the following changes to the Retail Prospectus
and Retirement Prospectus, as indicated below, are made effective as of the date hereof.</p>
2026-10-01
2026-02-01
Fees and Expenses of the
Fund
<p id="xdx_A8D_eoef--ExpenseNarrativeTextBlock_zyjWfU9fkW3h" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0 0.5in; text-align: justify">This table describes the fees and expenses
that you may pay if you buy and hold shares of the Fund. <b>You may pay other fees, such as brokerage commissions and other fees to financial
intermediaries, which are not reflected in the tables and examples below. </b><span id="xdx_905_eoef--ExpenseBreakpointDiscounts_c20261001__20261001__dei--DocumentInformationDocumentAxis__custom--RetailMember__dei--LegalEntityAxis__custom--S000015648Member_zf2KXffOrgna">You may qualify for discounts from the sales charges applicable
to Class A shares if you or other qualifying account holders invest, or agree to invest in the future, at least <span id="xdx_90F_eoef--ExpenseBreakpointMinimumInvestmentRequiredAmount_c20261001__20261001__dei--DocumentInformationDocumentAxis__custom--RetailMember__dei--LegalEntityAxis__custom--S000015648Member_zN3ar3Eoyru1">$50,000</span> in the Thornburg
Funds.</span> More information about this and other discounts and sales charge waivers is available from your financial intermediary, in the
Prospectus under the captions “Class A Sales Charge Waivers,” beginning on page 154, and “Appendix A – Sales Charge
Waivers Offered by Financial Intermediaries,” beginning on page 208, and in the Statement of Additional Information under the
caption “Additional Information Respecting Purchase and Redemption of Shares,” beginning on page 94.</p>
<p style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0"></p>
You may qualify for discounts from the sales charges applicable
to Class A shares if you or other qualifying account holders invest, or agree to invest in the future, at least $50,000 in the Thornburg
Funds.
50000
Shareholder Fees
(fees paid directly from your investment)
<p id="xdx_A8A_eoef--ShareholderFeesTableTextBlock_zKmgdM4pNuSl" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0"></p>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; margin-left: auto; width: 90%; border-collapse: collapse; margin-right: auto">
<tr>
<td style="padding: 3pt; vertical-align: bottom; width: 44%"><b> </b></td>
<td id="xdx_491_20261001__20261001__oef--ClassAxis__custom--C000042664Member_zwLcPHekPiE3" style="padding: 3pt; vertical-align: bottom; width: 13%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>Class
a</b></span></td>
<td id="xdx_496_20261001__20261001__oef--ClassAxis__custom--C000042665Member_zXuUjy9XU7Pi" style="padding: 3pt; vertical-align: top; width: 12%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
c</b></span></td>
<td id="xdx_494_20261001__20261001__oef--ClassAxis__custom--C000042663Member_zUtDoKI1awhg" style="padding: 3pt; vertical-align: top; width: 16%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
i</b></span></td>
<td id="xdx_49F_20261001__20261001__oef--ClassAxis__custom--C000123223Member_zJTWEWzCqq8e" style="padding: 3pt; vertical-align: top; width: 15%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
r6</b></span></td></tr>
<tr id="xdx_407_eoef--MaximumSalesChargeImposedOnPurchasesOverOfferingPrice_dpn_zlQeqZlXhWq1" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">4.50%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">none</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">none</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">none</td></tr>
<tr style="background-color: white">
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: bottom">Maximum Deferred Sales Charge (Load) (as a percentage of redemption proceeds or original purchase price, whichever is lower)</td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; text-align: center; vertical-align: top"><span id="xdx_90C_eoef--MaximumDeferredSalesChargeOverOther_dpn_c20261001__20261001__oef--ClassAxis__custom--C000042664Member_fMQ_____zzv8ucKCLiad" title="Maximum Deferred Sales Charge (Load) (as a percentage of redemption proceeds or original purchase price, whichever is lower)">none</span><sup>(1)</sup></td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: top; text-align: center"><span id="xdx_906_eoef--MaximumDeferredSalesChargeOverOther_dpn_c20261001__20261001__oef--ClassAxis__custom--C000042665Member_fMg_____z069pSLL99pd">1.00%</span><sup>(2)</sup></td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: top; text-align: center"><span id="xdx_902_eoef--MaximumDeferredSalesChargeOverOther_dpn_c20261001__20261001__oef--ClassAxis__custom--C000042663Member_zoa4QArueVQ6">none</span></td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: top; text-align: center"><span id="xdx_907_eoef--MaximumDeferredSalesChargeOverOther_dpn_c20261001__20261001__oef--ClassAxis__custom--C000123223Member_zs11DjNVWioe">none</span></td></tr>
</table>
0.0450
0
0
0
0
0.0100
0
0
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage
of the value of your investment)
<p id="xdx_A89_eoef--AnnualFundOperatingExpensesTableTextBlock_zsJnUQw4bUf6" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0"></p>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; margin-left: auto; width: 90%; border-collapse: collapse; margin-right: auto">
<tr>
<td style="padding: 3pt; vertical-align: bottom; width: 44%"><b> </b></td>
<td id="xdx_493_20261001__20261001__oef--ClassAxis__custom--C000042664Member_zy9uSCOwhNJc" style="padding: 3pt; vertical-align: bottom; width: 13%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>Class
a</b></span></td>
<td id="xdx_491_20261001__20261001__oef--ClassAxis__custom--C000042665Member_z3eSDzU9HDA3" style="padding: 3pt; vertical-align: top; width: 12%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
c</b></span></td>
<td id="xdx_492_20261001__20261001__oef--ClassAxis__custom--C000042663Member_z7c8pfNOnJmf" style="padding: 3pt; vertical-align: top; width: 16%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
i</b></span></td>
<td id="xdx_495_20261001__20261001__oef--ClassAxis__custom--C000123223Member_zIkKmM8o7Yz1" style="padding: 3pt; vertical-align: top; width: 15%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
r6</b></span></td></tr>
<tr id="xdx_405_eoef--ManagementFeesOverAssets_dpn_zfx2lt8wZx78" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Management Fees</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.86%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.86%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.86%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.86%</td></tr>
<tr id="xdx_403_eoef--DistributionAndService12b1FeesOverAssets_dpn_zFcG9PdKa7fl">
<td style="padding: 3pt; vertical-align: bottom">Distribution and Service (12b-1 Fees)</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.25%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">1.00%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">none</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">none</td></tr>
<tr id="xdx_405_eoef--OtherExpensesOverAssets_dpn_zTSMdbOcZcT4" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Other Expenses</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.29%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.73%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.24%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.18%</td></tr>
<tr id="xdx_407_eoef--ExpensesOverAssets_dpn_zD6mBUzLKYUd">
<td style="padding: 3pt; vertical-align: bottom">Total Annual Fund Operating Expenses</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">1.40%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">2.59%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">1.10%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">1.04%</td></tr>
<tr id="xdx_404_eoef--FeeWaiverOrReimbursementOverAssets_dpn_zG9YsTMViWd3" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Fee Waiver/Expense Reimbursement<sup id="xdx_F4A_zj7VV9GY3wH5">(3)</sup></td>
<td style="padding: 3pt; vertical-align: top; text-align: center"> (0.05)%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">(0.26)%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">(0.16)%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">(0.18)%</td></tr>
<tr id="xdx_40C_eoef--NetExpensesOverAssets_dpn_zdyhBcbfRdIc">
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: bottom">Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement<sup id="xdx_F47_znQOFoMBvK45">(4)</sup></td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: top; text-align: center">1.35%</td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: top; text-align: center">2.33%</td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: top; text-align: center">0.94%</td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: top; text-align: center">0.86%</td></tr>
</table>
0.0086
0.0086
0.0086
0.0086
0.0025
0.0100
0
0
0.0029
0.0073
0.0024
0.0018
0.0140
0.0259
0.0110
0.0104
-0.0005
-0.0026
-0.0016
-0.0018
0.0135
0.0233
0.0094
0.0086
<div id="xdx_A88_eoef--ExpenseFootnotesTextBlock_zAOPXPI6b6od"></div>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; width: 100%; margin-top: 12pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"></td><td id="xdx_F06_zXTmmERaX6ag" style="width: 0.5in">(1)</td><td style="text-align: justify"><i id="xdx_F1A_zGmNIeDbB9W9">Up to a 1.00% contingent deferred sales charge (CDSC) is imposed on redemptions of any part or all
of a purchase of $1 million or more within 12 months of purchase.</i></td></tr><tr style="vertical-align: top">
<td> </td><td> </td><td style="text-align: justify"> </td></tr>
<tr style="vertical-align: top">
<td> </td><td id="xdx_F0F_zKSCNxVFlA3e">(2)</td><td style="text-align: justify"><i id="xdx_F15_zAyy5grchgq6">Imposed only on redemptions of Class C shares within 12 months of purchase.</i></td></tr>
<tr style="vertical-align: top">
<td> </td><td> </td><td style="text-align: justify"> </td></tr>
<tr style="vertical-align: top">
<td> </td><td id="xdx_F04_zjrWKgM13Q3c">(3)</td><td style="text-align: justify"><i id="xdx_F1A_ztnqHs63Erkk">Effective October 1, 2026, Thornburg Investment Management, Inc. (“Thornburg”) has contractually
agreed to waive fees and reimburse expenses incurred by the Fund so that actual Class A, Class C, Class I and Class R6 expenses (excluding
taxes, interest expenses, acquired fund fees and expenses, brokerage commissions, borrowing costs, expenses relating to short sales, and
unusual expenses such as contingency fees or litigation costs) do not exceed 1.35%, 2.33%, 0.94% and 0.86%, respectively. The agreement
to waive fees and reimburse expenses may be terminated by the Fund’s Trustees at any time, but may not be terminated by Thornburg
before <span id="xdx_909_eoef--FeeWaiverOrReimbursementOverAssetsDateOfTermination_c20261001__20261001__oef--ClassAxis__custom--C000042664Member_zH9ggycHh3j"><span id="xdx_900_eoef--FeeWaiverOrReimbursementOverAssetsDateOfTermination_c20261001__20261001__oef--ClassAxis__custom--C000042665Member_zFqiWfRuaneb"><span id="xdx_90B_eoef--FeeWaiverOrReimbursementOverAssetsDateOfTermination_c20261001__20261001__oef--ClassAxis__custom--C000042663Member_z3DkOt5w4Dm4"><span id="xdx_908_eoef--FeeWaiverOrReimbursementOverAssetsDateOfTermination_c20261001__20261001__oef--ClassAxis__custom--C000123223Member_zK46BwaiIYff">January 31, 2028</span></span></span></span>, unless Thornburg ceases to be the investment advisor of the Fund prior to that date. Thornburg may recoup amounts
waived or reimbursed during the Fund’s fiscal year if, after taking the recoupment into account, the Fund’s actual expenses
fall below the expense cap during that same fiscal year.</i></td></tr>
<tr style="vertical-align: top">
<td> </td><td> </td><td style="text-align: justify"> </td></tr>
<tr style="vertical-align: top">
<td> </td><td id="xdx_F06_z2BSTsrhG28">(4)</td><td style="text-align: justify"><i id="xdx_F1C_zHiGVBDv2rj2"><span id="xdx_904_eoef--ExpensesRestatedToReflectCurrent_c20261001__20261001__dei--LegalEntityAxis__custom--S000015648Member__dei--DocumentInformationDocumentAxis__us-gaap--RetailMember_zUhcCiA5AbMi">Total annual fund operating expenses after fee waiver/expense reimbursement
have been restated to reflect the current fee waiver/expense reimbursement arrangement.</span></i></td></tr>
</table>
January 31, 2028
January 31, 2028
January 31, 2028
January 31, 2028
Total annual fund operating expenses after fee waiver/expense reimbursement
have been restated to reflect the current fee waiver/expense reimbursement arrangement.
Example.
<p id="xdx_A8C_eoef--ExpenseExampleNarrativeTextBlock_zBQ5oqhHEWHj" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0 0.5in; text-align: justify">This Example is intended
to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.</p>
<p style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0 0.5in; text-align: justify">The Example assumes that you invest $10,000
in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that
your investment has a 5% return each year, dividends and distributions are reinvested, and that the Fund’s operating expenses remain
the same. Although your actual costs may be higher or lower, based on these assumptions (and giving effect to fee waivers and expense
reimbursements in the first year), your costs would be:</p>
<p id="xdx_A84_eoef--ExpenseExampleWithRedemptionTableTextBlock_z78FelE1IUwc" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0"></p>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; margin-left: auto; width: 90%; border-collapse: collapse; margin-right: auto">
<tr>
<td style="padding: 3pt; vertical-align: bottom; width: 44%"><b> </b></td>
<td id="xdx_485_eoef--ExpenseExampleYear01_zpuSkurWHFdl" style="padding: 3pt; vertical-align: bottom; width: 13%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>1
year</b></span></td>
<td id="xdx_48B_eoef--ExpenseExampleYear03_zhHUxlQ6P6Eh" style="padding: 3pt; vertical-align: top; width: 12%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>3
years</b></span></td>
<td id="xdx_48F_eoef--ExpenseExampleYear05_z0PSgvzXGbG2" style="padding: 3pt; vertical-align: top; width: 16%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>5
years</b></span></td>
<td id="xdx_488_eoef--ExpenseExampleYear10_zRzUqVzebUhb" style="padding: 3pt; vertical-align: top; width: 15%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>10
years</b></span></td></tr>
<tr id="xdx_41A_20261001__20261001__oef--ClassAxis__custom--C000042664Member_zq9kY0VTv5si" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Class A Shares</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$581</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$869</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$1,177</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$2,050</td></tr>
<tr id="xdx_41D_20261001__20261001__oef--ClassAxis__custom--C000042665Member_zYztRnsfNrS5">
<td style="padding: 3pt; vertical-align: bottom">Class C Shares</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$336</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$781</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$1,352</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$2,905</td></tr>
<tr id="xdx_410_20261001__20261001__oef--ClassAxis__custom--C000042663Member_znRVufHRXqS" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Class I Shares</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$96</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$334</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$591</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$1,326</td></tr>
<tr id="xdx_418_20261001__20261001__oef--ClassAxis__custom--C000123223Member_zJ6bAVFrzIJ6">
<td style="padding: 3pt; vertical-align: bottom">Class R6 Shares</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$88</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$313</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$557</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$1,255</td></tr>
</table>
581
869
1177
2050
336
781
1352
2905
96
334
591
1326
88
313
557
1255
<p id="xdx_A89_eoef--ExpenseExampleNoRedemptionNarrativeTextBlock_zKLwnLC904J8" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0 0.5in; text-align: justify">You would pay the following expenses if
you did not redeem your Class C shares:</p>
<p id="xdx_A80_eoef--ExpenseExampleNoRedemptionTableTextBlock_zCFotY4RvIxg" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0"></p>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; margin-left: auto; width: 90%; border-collapse: collapse; margin-right: auto">
<tr>
<td style="padding: 3pt; vertical-align: bottom; width: 44%"><b> </b></td>
<td id="xdx_485_eoef--ExpenseExampleNoRedemptionYear01_zVJa3VYaC1jd" style="padding: 3pt; vertical-align: bottom; width: 13%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>1
year</b></span></td>
<td id="xdx_48B_eoef--ExpenseExampleNoRedemptionYear03_zfZYiQnFWCR5" style="padding: 3pt; vertical-align: top; width: 12%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>3
years</b></span></td>
<td id="xdx_48F_eoef--ExpenseExampleNoRedemptionYear05_zMdyZAIKaOB5" style="padding: 3pt; vertical-align: top; width: 16%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>5
years</b></span></td>
<td id="xdx_488_eoef--ExpenseExampleNoRedemptionYear10_zBqnbGtrifC5" style="padding: 3pt; vertical-align: top; width: 15%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>10
years</b></span></td></tr>
<tr id="xdx_411_20261001__20261001__oef--ClassAxis__custom--C000042665Member_zYrszTxbhlC2" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Class C Shares</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$236</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$781</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$1,352</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$2,905</td></tr>
</table>
236
781
1352
2905
Fees and Expenses of the
Fund
<p id="xdx_A8C_eoef--ExpenseNarrativeTextBlock_zRE1waT7B19j" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0 0.5in; text-align: justify">This table describes the fees and expenses
that you may pay if you buy and hold shares of the Fund. <b>You may pay other fees, such as brokerage commissions and other fees to financial
intermediaries, which are not reflected in the tables and examples below.</b></p>
Shareholder Fees
(fees paid directly from your investment)
<p id="xdx_A84_eoef--ShareholderFeesTableTextBlock_zi7zmvO6Db94" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0"></p>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; margin-left: auto; width: 90%; border-collapse: collapse; margin-right: auto">
<tr>
<td style="padding: 3pt; vertical-align: bottom; width: 45%"><b> </b></td>
<td id="xdx_49B_20261001__20261001__oef--ClassAxis__custom--C000058465Member_zXhsWrRebkP6" style="padding: 3pt; vertical-align: bottom; width: 16%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>Class
R3</b></span></td>
<td id="xdx_49F_20261001__20261001__oef--ClassAxis__custom--C000058466Member_zqLHJd72Ul43" style="padding: 3pt; vertical-align: top; width: 21%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
R4</b></span></td>
<td id="xdx_492_20261001__20261001__oef--ClassAxis__custom--C000058467Member_z4LVZ7N2iwgf" style="padding: 3pt; vertical-align: top; width: 18%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
R5</b></span></td></tr>
<tr id="xdx_403_eoef--MaximumSalesChargeImposedOnPurchasesOverOfferingPrice_dpn_z9fDNMNao5pb" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">none</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">none</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">none</td></tr>
<tr id="xdx_40A_eoef--MaximumDeferredSalesChargeOverOther_dpn_zBIxwgxIZpZ3" style="background-color: white">
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: bottom">Maximum Deferred Sales Charge (Load) (as a percentage of redemption proceeds or original purchase price, whichever is lower)</td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; text-align: center; vertical-align: top">none</td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: top; text-align: center">none</td>
<td style="border-bottom: #1F4E79 1.5pt solid; padding: 3pt; vertical-align: top; text-align: center">none</td></tr>
</table>
0
0
0
0
0
0
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage
of the value of your investment)
<p id="xdx_A84_eoef--AnnualFundOperatingExpensesTableTextBlock_zBatnUbrocNh" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0"></p>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; margin-left: auto; width: 90%; border-collapse: collapse; margin-right: auto">
<tr>
<td style="padding: 3pt; vertical-align: bottom; width: 45%"><b> </b></td>
<td id="xdx_499_20261001__20261001__oef--ClassAxis__custom--C000058465Member_zWCwUVntFaH7" style="padding: 3pt; vertical-align: bottom; background-color: #234B8D; text-align: center; width: 16%"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>Class
R3</b></span></td>
<td id="xdx_492_20261001__20261001__oef--ClassAxis__custom--C000058466Member_zKr8Gm1zEVbj" style="padding: 3pt; vertical-align: top; background-color: #234B8D; text-align: center; width: 21%"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
r4</b></span></td>
<td id="xdx_497_20261001__20261001__oef--ClassAxis__custom--C000058467Member_zPUY3CjiXoc5" style="padding: 3pt; vertical-align: top; background-color: #234B8D; text-align: center; width: 18%"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>class
r5</b></span></td></tr>
<tr id="xdx_405_eoef--ManagementFeesOverAssets_dpn_zpdk6hw9ojUe" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Management Fees</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.86%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.86%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.86%</td></tr>
<tr id="xdx_403_eoef--DistributionAndService12b1FeesOverAssets_dpn_z9qUs6zHvZQ7">
<td style="padding: 3pt; vertical-align: bottom">Distribution and Service (12b-1 Fees)</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.50%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.25%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">none</td></tr>
<tr id="xdx_405_eoef--OtherExpensesOverAssets_dpn_zflaw4SGiTkf" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Other Expenses</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">1.00%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">1.01%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.90%</td></tr>
<tr id="xdx_407_eoef--ExpensesOverAssets_dpn_z1Xtl70w1cd">
<td style="padding: 3pt; vertical-align: bottom">Total Annual Fund Operating Expenses</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">2.36%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">2.12%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">1.76%</td></tr>
<tr id="xdx_404_eoef--FeeWaiverOrReimbursementOverAssets_dpn_zGRtDBB41J41" style="background-color: #E9EDF3">
<td style="border-bottom: #234B8D 1pt solid; padding: 3pt; vertical-align: bottom">Fee Waiver/Expense Reimbursement<sup id="xdx_F4B_z5WJe5Ig4Kh6">(1)</sup></td>
<td style="border-bottom: #234B8D 1pt solid; padding: 3pt; vertical-align: top; text-align: center">(0.92)%</td>
<td style="border-bottom: #234B8D 1pt solid; padding: 3pt; vertical-align: top; text-align: center">(0.93)%</td>
<td style="border-bottom: #234B8D 1pt solid; padding: 3pt; vertical-align: top; text-align: center">(0.82)%</td></tr>
<tr id="xdx_40C_eoef--NetExpensesOverAssets_dpn_zwZYSrHiLgR6">
<td style="padding: 3pt; vertical-align: bottom">Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement<sup id="xdx_F46_z7aDPjOwJSp6">(2)</sup></td>
<td style="padding: 3pt; vertical-align: top; text-align: center">1.44%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">1.19%</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">0.94%</td></tr>
</table>
0.0086
0.0086
0.0086
0.0050
0.0025
0
0.0100
0.0101
0.0090
0.0236
0.0212
0.0176
-0.0092
-0.0093
-0.0082
0.0144
0.0119
0.0094
<div id="xdx_A80_eoef--ExpenseFootnotesTextBlock_zqWTRlkLFHO6"></div>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; width: 100%; margin-top: 12pt; margin-bottom: 0"><tr style="vertical-align: top">
<td style="width: 0.5in"></td><td id="xdx_F0F_zcASK6GVhOf5" style="width: 0.5in">(1)</td><td style="text-align: justify"><i id="xdx_F1D_zvzCnigyVLlk">Effective October 1, 2026, Thornburg Investment Management, Inc. (“Thornburg”) has
contractually agreed to waive fees and reimburse expenses incurred by the Fund so that actual Class R3, Class R4 and Class R5 expenses
(excluding taxes, interest expenses, acquired fund fees and expenses, brokerage commissions, borrowing costs, expenses relating to short
sales, and unusual expenses such as contingency fees or litigation costs) do not exceed 1.44%, 1.19% and 0.94%, respectively. The agreement
to waive fees and reimburse expenses may be terminated by the Fund’s Trustees at any time, but may not be terminated by Thornburg
before <span id="xdx_907_eoef--FeeWaiverOrReimbursementOverAssetsDateOfTermination_c20261001__20261001__oef--ClassAxis__custom--C000058465Member_zmv3J9Mosb4g"><span id="xdx_90D_eoef--FeeWaiverOrReimbursementOverAssetsDateOfTermination_c20261001__20261001__oef--ClassAxis__custom--C000058466Member_zsKGSqdJmXKf"><span id="xdx_90D_eoef--FeeWaiverOrReimbursementOverAssetsDateOfTermination_c20261001__20261001__oef--ClassAxis__custom--C000058467Member_zCr2DQVzhNeg">January 31, 2028</span></span></span>, unless Thornburg ceases to be the investment advisor of the Fund prior to that date. Thornburg may recoup amounts
waived or reimbursed during the Fund’s fiscal year if, after taking the recoupment into account, the Fund’s actual expenses
fall below the expense cap during that same fiscal year.</i></td></tr></table>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; width: 100%; margin-top: 12pt; margin-bottom: 0"><tr style="vertical-align: top">
<td style="width: 0.5in"></td><td id="xdx_F0D_z6IG6kcRbgCb" style="width: 0.5in">(2)</td><td style="text-align: justify"><i id="xdx_F16_zdiwN1xkZLgd"><span id="xdx_90F_eoef--ExpensesRestatedToReflectCurrent_c20261001__20261001__dei--LegalEntityAxis__custom--S000015648Member__dei--DocumentInformationDocumentAxis__custom--RetirementMember_zjHvFwZrR1sb">Total annual fund operating expenses after fee waiver/expense reimbursement have been restated to reflect
the current fee waiver/expense reimbursement arrangement.</span></i></td></tr></table>
January 31, 2028
January 31, 2028
January 31, 2028
Total annual fund operating expenses after fee waiver/expense reimbursement have been restated to reflect
the current fee waiver/expense reimbursement arrangement.
<p id="xdx_A84_eoef--ExpenseExampleWithRedemptionTableTextBlock_z7cuxJx570B" style="font: 10pt Arial, Helvetica, Sans-Serif; margin: 12pt 0 0"></p>
<table cellpadding="0" cellspacing="0" style="font: 10pt Arial, Helvetica, Sans-Serif; margin-left: auto; width: 90%; border-collapse: collapse; margin-right: auto">
<tr>
<td style="padding: 3pt; vertical-align: bottom; width: 44%"><b> </b></td>
<td id="xdx_48F_eoef--ExpenseExampleYear01_zseacfPnB7S5" style="padding: 3pt; vertical-align: bottom; width: 13%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>1
year</b></span></td>
<td id="xdx_481_eoef--ExpenseExampleYear03_zEkK7hHb6CDc" style="padding: 3pt; vertical-align: top; width: 12%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>3
years</b></span></td>
<td id="xdx_482_eoef--ExpenseExampleYear05_zKQuvNCSx3i5" style="padding: 3pt; vertical-align: top; width: 16%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>5
years</b></span></td>
<td id="xdx_48B_eoef--ExpenseExampleYear10_z9mpbqtBIj5a" style="padding: 3pt; vertical-align: top; width: 15%; background-color: #234B8D; text-align: center"><span style="font-family: Arial, Helvetica, Sans-Serif; font-size: 9pt; text-transform: uppercase; color: white"><b>10
years</b></span></td></tr>
<tr id="xdx_412_20261001__20261001__oef--ClassAxis__custom--C000058465Member_zY41Ia7Mvpff" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Class R3 Shares</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$147</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$648</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$1,177</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$2,626</td></tr>
<tr id="xdx_412_20261001__20261001__oef--ClassAxis__custom--C000058466Member_zRN3kehtDkIj">
<td style="padding: 3pt; vertical-align: bottom">Class R4 Shares</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$121</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$574</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$1,054</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$2,378</td></tr>
<tr id="xdx_41F_20261001__20261001__oef--ClassAxis__custom--C000058467Member_zUbNE1JQQoy9" style="background-color: #E9EDF3">
<td style="padding: 3pt; vertical-align: bottom">Class R5 Shares</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$96</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$474</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$877</td>
<td style="padding: 3pt; vertical-align: top; text-align: center">$2,005</td></tr>
</table>
147
648
1177
2626
121
574
1054
2378
96
474
877
2005