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How long do I have to file an amended individual income tax return for a state change?

Answer #14 -- ( Published 07/29/2005 10:50 AM | Updated 07/12/2017 10:41 AM )

How long do I have to file an amended individual income tax return for a state change?

If your change decreases the tax due to Illinois and you want a refund, you must file Form IL-1040-X, Amended Individual Income Tax Return, within

  • three years after the extended due date, 
  • three years after the date your original return was filed, or 
  • one year after the date your Illinois tax was paid, whichever is latest.

If your change increases the tax you owe to Illinois, you should file Form IL-1040-X and pay the tax, penalty, and interest as soon as you realize that it is owed.

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