LLC by state
Start an LLC in Illinois
The Illinois state filing fee is $150. FilingFox forms your Illinois LLC end-to-end — name check, state filing, registered agent and documents — from $535 all-in.
Start my Illinois LLC →Illinois how-to guides
Can I Be My Own Registered Agent in Illinois? Requirements, Pros & Cons
Learn how to be your own Registered Agent in Illinois, meet state’s requirements, and discover pros and cons to protect your LLC a…
GuideHow to Change Your LLC Name in Illinois: Step-by-Step Guide
Learn how to change your LLC name in Illinois with our step-by-step guide. File Articles of Amendment, update IRS and business lic…
GuideHow to File Illinois LLC Articles of Organization: Step-by-Step Guide
Learn how to file Illinois LLC Articles of Organization online or by mail. Discover filing fees, processing times, Registered Agen…
GuideHow to Form a General Partnership in Illinois: Guide to Legal Requirements, Advantages, and Differences
Learn how to form a General Partnership in Illinois with our comprehensive guide. Discover formation steps, legal requirements, pa…
GuideHow to Get a Free Illinois EIN Number for Your LLC: Step-by-Step Guide
Learn how to get a free Illinois EIN number for your LLC—step-by-step guide to IRS EIN application, requirements for Illinois LLC,…
GuideHow to Start a Sole Proprietorship in Illinois: A Step-by-Step Guide
Learn how to start a sole proprietorship in Illinois with our step-by-step guide. Discover DBA registration, EIN needs, licensing,…
GuideHow to Start a Sole Proprietorship in Illinois: Complete Guide to Legal Steps, Advantages, and Tax Tips
Learn how to start a sole proprietorship in Illinois, its advantages, disadvantages, and step-by-step guide on DBA registration, E…
GuideHow to Start an LLC in Illinois in 2025: Step-by-Step Guide to Formation, Costs, and Requirements
Learn how to start an LLC in Illinois in 2025 with our step-by-step guide. Discover costs, filing tips, registered agent options, …
GuideIllinois General Partnership Guide: How to Start, Tax, and Choose the Right Business Structure
Learn how to start a General Partnership in Illinois, including forming, tax requirements, advantages, and business structure opti…
GuideIllinois LLC Annual Report Guide: Deadlines, Fees, Filing Steps & Penalties
Learn how to file your Illinois LLC Annual Report online, understand deadlines, fees, penalties, and avoid costly late filing pena…
GuideIllinois LLC Business License Requirements: Your Complete Guide to State, Local, and Federal Permits
Learn Illinois LLC business license requirements, permits, and costs. Discover how to register for state, local, and industry-spec…
GuideIllinois LLC Costs in 2026: Formation, Fees, and Saving Tips
Discover the true LLC cost in Illinois for 2025, including formation fees, ongoing costs, and savings tips. Learn everything about…
GuideIllinois Business Entity Search & LLC Name Lookup
Discover how to perform an Illinois business name search in 2025, check LLC name availability, meet state rules, and avoid name co…
GuideIllinois LLC Operating Agreement: Free Template, Management Options & Legal Guide
Learn how to create a free Illinois LLC Operating Agreement with customizable templates, management options, and legal tips—essent…
GuideIllinois LLC Taxes: Complete Guide to State, Federal, and Local Obligations
Learn everything about Illinois LLC taxes including filing requirements, state taxes, sales tax, payroll taxes, S-Corp election, a…
GuideIllinois Registered Agent 2025 Guide: Requirements, Benefits, Costs & How to Choose
Discover how to choose and hire the best Illinois Registered Agent for LLC formation, legal document service, costs, and complianc…
GuideYour Complete Guide to General Partnerships in Illinois: Formation, Requirements, and Benefits
Learn how to form a General Partnership in Illinois. Discover formation steps, requirements, advantages, disadvantages, and essent…
Ready to form your Illinois LLC?
State filing, registered agent and documents from $535 — most orders submitted to the state within one business day.
Start my Illinois LLC →