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How far back can I file an amended return to claim an overpayment based on changes to my federal return?

Answer #729 -- ( Published 05/30/2008 08:46 AM | Updated 07/12/2017 10:41 AM )

How far back can I file an amended return to claim an overpayment based on changes to my federal 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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