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How can I file an amended return?

If you need to correct your Louisiana individual income tax return after it has been filed, you must file an amended return using the appropriate Form IT-540 (Resident Return) or Form IT-540B (Nonresident and Part-Year Resident Return) for the tax year being amended. Louisiana does not have a separate amended return form.

When filing an amended return:

  • Use the correct tax form for the year you are amending.

  • Complete the return as if you are filing it for the first time.

  • Do not adjust the return for any refunds previously received or payments already made. LDR will make those adjustments when processing your amended return.

  • Mark the "Amended Return" box on the return.

  • Include a written explanation of the changes you made.

  • Attach a copy of your federal amended return (Form 1040-X), if one was filed.

Common Reasons to File an Amended Return

You may need to amend your Louisiana return if you need to:

  • Correct your income.

  • Update your filing status.

  • Claim or remove deductions or tax credits.

  • Report income or tax documents that were omitted from your original return.

  • Report changes resulting from a federal amended return or IRS adjustment.

  • Correct other errors that affect your Louisiana tax liability.

You may file your amended Louisiana individual income tax return electronically using Louisiana File Online or mail it to the appropriate LDR mailing address.

Please note: Amended returns generally require additional review and typically take longer to process than original returns. Processing times vary depending on the complexity of the changes and whether additional documentation is required.

Recommendation: Before filing an amended return, verify that an amendment is necessary. If the IRS or LDR can correct the issue automatically, you may not need to amend your return. If your federal return has been amended, file your Louisiana amended return as soon as possible after the federal changes are finalized and include any required supporting documentation to help avoid processing delays.