Tax Forms | ILLINOIS DEPARTMENT OF REVENUE - Taxpayer Assistance Services

555 West Monroe Street, Chicago, IL 60661

Open to all

Service Hours Monday: 8:00 AM - 5:00 PM Tuesday: 8:00 AM - 5:00 PM Wednesday: 8:00 AM - 5:00 PM Thursday: 8:00 AM - 5:00 PM Friday: 8:00 AM - 5:00 PM

Voice·

Alternate Program Phone

Voice·

Primary Program Phone

Interpreter services available

Call for assistance Documents Required: None

No fee

All ZIP Codes, IL

Online resource that helps taxpayers understand and meet tax responsibilities. Also offers hotline for tax questions.

04/17/2026

Lake County 211

What's Here

INTERNAL REVENUE SERVICE IRS

Government organization overseeing federal taxes.