Find answers to your frequently asked tax questions with our Taxpayer Answer Center.
You must first make an effort to find a solution to your issue in the Taxpayer Answer Center before being allowed to contact our taxpayer support representatives by email. An email form linked to taxpayer support representatives that specialize in that category of issue will appear below each answer.
To receive assistance by phone, please call 800 732-8866 or 217 782-3336. Representatives are available Monday through Friday, 8 am - 5 pm. Our TDD (telecommunication device for the deaf) number is 800 544-5304.
IDOR also has a Business Hot Line that helps meet the needs of businesses and tax professionals. The Business Hot Line is available at 217 524-4772, Monday through Friday, 8 am - 5 pm.
When you come to one of the department's facilities, bring all available information with you. No appointments are necessary; however, if you have a complex issue, please contact the department ahead of time so they can be prepared to give you the help you may need.