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How far back can I file an amended return to claim an overpayment based on changes to my federal return?
- How far back can I file an amended return to claim a refund based on a state change only?
- How long do I have to file an IL-1040-X to report a federal change?
- Can I file Form IL-1040-X if I have not received my refund from my federal amended return?
- How long do I have to file an amended individual income tax return for a state change?
- How do I make changes to my individual income tax return?
If your federal change decreases your Illinois tax and you want a refund, you must file an amended return (claim for refund) within two years plus 120 days of federal finalization.
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