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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 do I make changes to my individual income tax return?

If you discover that you made an error on your return after it was filed or if your federal return was adjusted by the Internal Revenue Service (IRS), you should file an amended Illinois return using Form IL-1040-X, Amended Individual Income Tax Return. If you are filing Form IL-1040-X due to a federal change, do not file it until you receive notification from the IRS showing it was accepted. For more information, refer to the  Form IL-1040-X Instructions.

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