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File Form IL-1040-X, Amended Individual Income Tax Return, for tax years ending on December 31, 2021, and December 31, 2020, on MyTax Illinois

Use MyTax Illinois to electronically file your Amended Individual Income Tax Return. It’s fast, easy, and free.

DETERMINE YOUR ELIGIBILITY

You are eligible to file your IL-1040-X via MyTax Illinois if you

  • filed Form IL-1040 electronically for the tax year you want to amend; and
  • have created a MyTax Illinois account. Use the links in right-hand column to either create or access your MyTax Illinois account.

GATHER YOUR INFORMATION

Some common documents you may need to help you file are

  • a copy of your original IL-1040, including any departmental corrections, for the tax year you want to amend;
  • a copy of your U.S. 1040X or U.S. 1045;
  • proof of federal finalization for your U.S. 1040X or U.S. 1045;
  • a copy of any refund check and any other notification you received from the IRS stating they accepted the changes shown on your U.S. 1040X or U.S. 1045; and
  • account transcript from the IRS or examiner’s report.

FILE YOUR RETURN

CREATE a MyTax Illinois account to file your return

OR

ACCESS your MyTax Illinois account to file your return

Do I need to file Form IL-1040-X?

You should 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
  • you filed a U.S. 1040X or the Internal Revenue Service (IRS) adjusted your federal return and the change affects your Illinois return.

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.

Related topics

What about my refund?
You can check the status of your refund here: Where’s my refund?

I received a Return Correction Notice (RCN). What should I do?
Please respond to the RCN as directed.