Illinois Department of Revenue

Scam Alert: Fake Texts and Websites Impersonating IDOR

Be alert for fraudulent messages or websites attempting to steal your banking information, login credentials, or credit card details. The Illinois Department of Revenue (IDOR) will never request personal or financial information via text message. To confirm official communications or contact details, always visit https://tax.illinois.gov.

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Important Notices

2026 Tax Filing Season

The deadline to file 2025 Illinois individual returns is Wednesday, April 15, 2026.

Extended telephone hours for the 2025 tax filing season:

Tuesday, April 14, 2026: 8:00 a.m. - 7:00 p.m.
Wednesday, April 15, 2026: 7:30 a.m. - 7:00 p.m.

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 (illinois.gov).

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.