Starting and registering a business in Illinois
Find business registration, startup instructions, and employer tax ID information.
SBA business registration and startup guide
Official startup guide covering business registration, business structure, and federal and state tax IDs.
About starting and registering a business
Find official business registration and startup information, state filing offices, and federal employer identification number instructions. Registration, tax accounts, and permits are separate steps. Check the agencies responsible for your business location and activity.