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IDOR News & Updates -  July 2, 2024

What you need to know if you received a letter for Estimated Payment Penalty. 

An estimated payment penalty is assessed on your income tax amount if you did not make timely estimated tax payments. Estimated tax payments are required quarterly on your income if you will owe $1,000 or more in Illinois income tax at the end of the year, and you do not have enough tax withheld on your income.

Estimated Payment Due Dates 

Estimated payments are due on April 15, June 15, September 15, and January 15 of every year.

If any of the payments are late or less than the amount required, you may be assessed a penalty for late payment of estimated tax.

If you earn income from which there is no tax withheld, it is your responsibility to make quarterly estimated tax payments on this income. 

Contact Information

Email: ​REV.TA-IIT@illinois.gov.

Phone: 1 800 732-8866 or 217 782-3336. (TTY 1 800 544-5304). Over-the-phone translation services are available.

Website: tax.illinois.gov

Mailing address: Illinois Department of Revenue, PO BOX 19023, SPRINGFIELD, IL 62794-9023.

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