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

Form IL-1040-X, Amended Individual Income Tax Return. However, if you filed your IL-1040 through MyTax Illinois, you may also file Form IL-1040-X through MyTax Illinois. If you are filing Form IL-1040-X due to a federal change, do not file it 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 to the Questions, Comments, or Request form.