LLC PathfinderHow to Start an LLC in Illinois
Forming an LLC in Illinois costs $150 in state filing fees. Here are the five steps, the ongoing costs, and the official links.
1Step 1: Choose your LLC name
Your name must be distinguishable from existing Illinois entities and include "LLC" or "Limited Liability Company". Search the Illinois business records before filing.
2Step 2: Appoint a registered agent
You need a registered agent with a physical street address in Illinois who can accept legal mail during business hours. If you don't live there, or want to keep your home address off public records, use a commercial agent. See our service comparison.
3Step 3: File your formation document
File with the state for $150. Most states accept online filings, which are usually the fastest. Prefer someone else to handle it?
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4Step 4: Write an operating agreement
Most states don't require you to file one, but banks often ask for it, and it protects your liability shield, especially for multi-member LLCs.
5Step 5: Get an EIN from the IRS
An EIN is free from the IRS. Read our EIN guide.
Staying compliant in Illinois
Annual report $75. Due: Before first day of anniversary month. See the full Illinois LLC cost breakdown.
FAQ
How much does it cost to start an LLC in Illinois?
The Illinois state filing fee is $150. Ongoing: Annual report $75.
Do I need a registered agent in Illinois?
Yes. Every Illinois LLC must keep a registered agent with a physical address in Illinois. You can be your own agent if you live there, or hire a commercial registered agent.
When is the Illinois LLC annual report due?
Before first day of anniversary month.
Last updated 2026-10-11.