How to Form an LLC in Illinois

Step 1: Choose and check your LLC name

Illinois LLC names must include “Limited Liability Company,” “LLC,” or “L.L.C.” Search availability via the Illinois Secretary of State business search.

Step 2: Appoint a registered agent

Your Illinois LLC needs a registered agent with a physical street address in the state who is available during normal business hours to receive service of process. You can serve as your own agent if you reside in Illinois.

Step 3: File Articles of Organization

File Articles of Organization with the Illinois Secretary of State. The filing fee is $150. Online filing is available and is typically faster than mail.

Step 4: Get an EIN from the IRS

Apply for a free Employer Identification Number through IRS.gov. EINs issue immediately for online applicants with a US Social Security Number or ITIN.

Step 5: Draft an Operating Agreement

Illinois does not require LLCs to file an Operating Agreement, but having one is essential to preserve liability protection — especially for single-member LLCs.

Step 6: Comply with annual obligations

Illinois requires an annual report (or equivalent) costing $75 on a annual basis. Set a calendar reminder; the late-filing penalty in most states is significant.

Step 7: Local licensing and permits

Check city and county requirements wherever your LLC operates in Illinois. Many municipalities require a local business license even for online businesses.

Illinois-specific notes

Illinois LLCs are subject to the Personal Property Replacement Tax of 1.5% on net income, in addition to flow-through state income tax on members.