You may be able to e-file your state at File Form IL-1040-X, Amended Individual Income Tax Return. Otherwise, you need to mail all forms that have changed from the original filing along with any additional forms received, w2, etc. If you are filing a federal amended return, please be aware of the rules in Amending My Return - Filing Requirements - Illinois.gov which state:
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.
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