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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?

Answer #730 -- ( Published 05/30/2008 08:49 AM | Updated 07/12/2017 10:41 AM )

If my Illinois tax liability increases as a result of my federal change, how long do I have to amend and pay the additional liability to the State of Illinois?

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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