Small business events in your area
Doing business in the state
Registration, Licenses, and Permits
Step-by-Step Guide to Starting a Business in Illinois
Illinois Department of Commerce and Economic Opportunity
Taxation
Illinois Department of Revenue - Businesses
Employer links
Department of Employment Security
General
Small Business Administration - Illinois
Selling to the State of Illinois
SBA.gov's business licenses and permits search tool allows you to get a listing of federal, state and local permits, licenses, and registrations you'll need to run a business.