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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.

Welcome to the Illinois Department of Revenue

Committed to excellence and working together to fund Illinois' future

Important Notices

Have you received a letter or Final Notice of Tax Due assessing an Estimated Payment Penalty?

Learn why you received this letter from IDOR by visiting our webpage Letters and Notices for Individual income Tax (

Response Options for Identity Verification Letters

If you received an identity verification letter from the Illinois Department of Revenue, you can respond electronically by selecting the option that matches your letter: enter a code, take a quiz, or attach documents. No MyTax Illinois account is required. For more information, see Identity Verification Letters Information.

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