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If my Illinois tax increases as a result of my federal change, how long do I have to amend and pay the additional liability?
- How long do I have to file an IL-1040-X to report a federal change?
- What is the difference between a federal and state change when filing Form IL-1040-X?
- 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 far back can I file an amended return to claim an overpayment based on changes to my federal return?
If your federal change increases your Illinois tax, you must file Form IL-1040-X and pay any additional tax within 120 days of the federal finalization date or you may be assessed a late-payment penalty.
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