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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.

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

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.

If you have additional inquiries, you may submit them on the Questions, Comments, or Requests form.