State resources / IL
Illinois tax and business resources
Official state links for individual filing, forms, business registration, employer reporting, and entity services.
Illinois
Individuals
Personal Filing
Payments, Refunds, and Online Services
Forms and Instructions
Illinois
Businesses
Business Registration and State Services
Business Tax and Withholding
Employer Payroll Reporting
These links open official or agency-designated external resources in a new tab. Requirements and online services may change over time.