The Illinois Department of Revenue (IDOR) offers assistance by phone at 1-800 732-8866 or 217-782-3336. Representatives are available Monday through Friday, 8 am - 5 pm.  Over-the-phone translation services are available. Their TDD (telecommunication device for the deaf) number is 1-800 544-5304. Receive assistance by email for Business Income Tax or Withholding Income Tax at REV.TA-BIT-WIT@illinois.gov. More information is available at: https://tax.illinois.gov/aboutidor/contactus.html

IDOR also provides in-person taxpayer assistance at its Regional Office Locations. 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. Translation services are available.