Where to register a business in Illinois?
Starting a business in Illinois requires registering with the correct state authorities to ensure full legal compliance. Whether you’re forming a local LLC, expanding a foreign corporation, or launching a new venture, registration must be completed through the appropriate agencies at both the state and, in some cases, local levels.
1. Illinois Secretary of State – Business Services Department
This is the primary state authority for registering LLCs, corporations, partnerships, and foreign entities (businesses formed in another state or country).
- Online registration portal: https://www.ilsos.gov
- For LLCs: File Articles of Organization (Form LLC-5.5)
- For Corporations: File Articles of Incorporation (Form BCA 2.10)
- Required for businesses that want legal recognition and limited liability protection
2. Illinois Department of Revenue (IDOR)
Businesses that plan to collect sales tax, hire employees, or file state taxes must register for a Business Tax Number (IBT Number) through the IDOR.
- Register online at: https://mytax.illinois.gov
- This registration is required for most businesses operating in the state
3. County Clerk or City Hall (for Sole Proprietorships or DBAs)
If you’re operating as a sole proprietorship or under a fictitious name (DBA), you may need to register your business name with your county clerk’s office, such as:
- Cook County Clerk (for businesses in Chicago and surrounding areas)
- Local municipalities may also require business licenses, zoning permits, or home occupation permits
At One IBC USA, we assist local and international entrepreneurs in registering businesses in Illinois efficiently and compliantly. From entity selection and name reservation to EIN registration and tax setup, we ensure your business is fully prepared to operate within the state.
Contact us today to start your Illinois business registration with professional guidance.
