Form an LLC by State › Illinois
Cheapest and fastest way to file an LLC in Illinois (2026)
Filing an LLC in Illinois costs $150 in state fees. The pages we read list no faster option and no turnaround. Mainstay Filing, our best overall pick, files it for you and keeps the registered agent.
- Official sources, checked October 20, 2026
Cheapest vs fastest in Illinois
| Route | What you get | State cost |
|---|---|---|
| Cheapest | Standard filing; turnaround not published | $150 |
| Fast, no extra fee | None listed | — |
Paid lanes are the filing fee plus the expedite fee. The yearly report is $75 afterwards.
Mainstay Filing
Our rating: 4.9 out of 5
$199 / year, same at renewal
- LLC formation, prepared and filed
- Registered agent, all year
- EIN application (with an SSN or ITIN)
- Annual report filed every year it is due where the state requires one
- Compliance reminders and stored documents
Price from the Mainstay Filing pricing and FAQ pages, checked October 21, 2026. State fees are passed through at cost and shown before you pay.
Questions
What is the cheapest way to file an LLC in Illinois?
The cheapest route is the plain filing at $150, with no turnaround published on the pages we read.
What is the fastest way to file an LLC in Illinois?
The pages we read list no faster option and no turnaround.
How much does it cost to expedite a Illinois LLC?
The pages we read list no expedite fee.
Sources
- 805 ILCS 180/5-5 (articles of organization); 805 ILCS 180/5-1 (filing with Secretary of State) (multira state research spine): www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=080501800K5-5, checked August 12, 2026
- Illinois formation fee: Filing fee, official source read 2026-10-01: www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=080501800K50-10, checked October 1, 2026
- Illinois formation fee: Filing fee, official source read 2026-10-01: www.ilsos.gov/publications/business-services/llc.html, checked October 1, 2026
- Illinois Secretary of State, Department of Business Services, Limited Liability Division (multira state research spine): www.ilsos.gov/departments/business-services/annual-reports/llc-instructions.html, checked August 12, 2026
- Illinois Secretary of State, Department of Business Services, Limited Liability Division (multira state research spine): www.ilsos.gov/departments/business-services/annual-reports.html, checked August 12, 2026
- Illinois registered agent statute (805 ILCS 180/1-35): www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=080501800K1-35, checked October 20, 2026
- Illinois Secretary of State: www.ilsos.gov/, checked October 20, 2026