Illinois State Unemployment Insurance
General administration:
Department of Employment Security
33 South State Street
Chicago, IL 60603
312-793-5700
http://www.ides.state.il.us/
Register as employer by filing Form UI-1 (Report to Determine Liability):
Department of Employment Security
33 South State Street
Chicago, IL 60603-2802
Report quarterly wages and contributions by filing Form UI-3/40 Employer's Contribution and Wage Report) by last day of month following end of quarter. Employers with more than 250 employees in the previous calendar year must file via magnetic media. Submit paper copies to:
IDES
P.O. Box 19300
Springfield, IL 62794
Experience rating formula, base,and rates
Wage base is $11,500 for 2007 and $12,000 for 2008
Rates range from 0.80% to 7.20%
New employers use 3.4% to 4.0% depending on industry classification
Rates include the 0.6% fund-building factor
