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IDOR News & Updates - June 3, 2025 |
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Did you make a mistake or forget to include information on your Illinois individual income tax return?
If the answer is yes, don't worry. Filing an amended individual income tax return is a simple way to correct the situation and ensures you either pay what you owe or receive a refund of what you are due. |
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How to File an Amended Return:
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Use the Correct Form - Always file Form IL-1040-X to amend an individual income tax return.
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Include Supporting Documents - If you are amending due to a federal adjustment, wait until the Internal Revenue Service (IRS) finalizes it, and include supporting proof with your amended return.
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Provide a Clear Explanation - Use Step 11, Line D of Form IL-1040-X to clearly explain the reason for the amendment. Incomplete or unclear explanations may delay processing.
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Sign and Date the Form - Both taxpayers must sign and date the form if filing jointly.
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Submit the Completed Return – Taxpayers can file using the modernized-file system (MeF) starting with the 2021 tax year, tax preparation software, or by mailing completed forms and documents.
Note: Taxpayers do not need to file an amended return for changes to names, addresses, or Social Security numbers. These updates can be made through MyTax Illinois or by mail.
What if I need tax assistance?
If you have questions about filing an amended Illinois tax return (Form IL-1040-X), please give us a call.
- 1 800 732-8866 or 217 782-3336
- 1 800 544-5304 TTY
Over-the-phone translation services are available.
Resources
For complete instructions, taxpayers can refer to the Form IL-1040-X instructions, available on the IDOR website, tax.illinois.gov.
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