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How do I correct an error on my electronically filed Form IL-1040 return?

You must file a paper Form IL-1040-X, Amended Individual Income Tax Return to correct any errors on your electronically filed Form IL-1040 return. 

If you are filing Form IL-1040-X due to a federal change, do not file until you receive notification from the IRS showing it was accepted. For more information, refer to the  Form IL-1040-X Instructions.

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