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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

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How long do I have to file an IL-1040-X to report a federal change?

If your federal change resulted in an overpayment or if you claimed a net operating loss (NOL) carryback, you should not file Form IL-1040-X until you receive a federal finalization notification from the IRS stating that they have accepted your change either by paying a refund or by final assessment, agreement, or judgment. If your federal change increases your Illinois tax, you must file a Form IL-1040-X, Amended Individual Income Tax Return 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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