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Scam Alert: Fake Texts and Websites Impersonating IDOR

Be alert for fraudulent messages or websites attempting to steal your banking information, login credentials, or credit card details. The Illinois Department of Revenue (IDOR) will never request personal or financial information via text message. To confirm official communications or contact details, always visit https://tax.illinois.gov.

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When must I file an amended return?

Do not file another Form IL-1040 to make changes to a previously filed Form IL-1040. You must file Form IL-1040-X, Amended Individual Income Tax Return, if

  • you discover that you made an error on your Illinois return after it was filed, or
  • your federal return has been adjusted either by the Internal Revenue Service (IRS) or on a 1040-X, Amended U.S. Individual Income Tax Return, you filed; the change affects your Illinois income, additions, subtractions, exemptions, or credits; and the change is final.

NOTE: If the federal change results in a refund, do not file Form IL-1040-X until you receive notification that your change has been accepted by the IRS. You must submit this notification (federal finalization) when you submit your IL-1040-X.

For more information, see Form IL-1040-X instructions.

You may access additional information by searching the entire Illinois Department of Revenue website.

If you have additional inquiries, you may submit them on the Questions, Comments, or Requests form.