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LLC Formation in Illinois: Cost, Steps & How to File

Every Illinois business owner eventually needs to answer the llc formation question: what does it cost, how long does it take, and where do I actually file? This page answers all three with the current Illinois numbers, plus the government link to start the application.

Typical cost

$50–$500

Timeline

1–20 days

Renewal

Annual or biennial report

Who needs it

anyone starting a business as a legal entity

Steps to form an LLC in Illinois

Step 1: Choose a unique business name and confirm it's available with the Secretary of State
Step 2: Designate a registered agent with a physical in-state address
Step 3: File Articles of Organization (paper or online) with the Secretary of State
Step 4: Pay the state filing fee
Step 5: Get an EIN from the IRS (free, online, immediate)
Step 6: Open a business bank account with the EIN and filed articles
Step 7: Draft an operating agreement (recommended, not required in most states)

Required documents

Government-issued ID
Business name
Registered agent info
Member/manager list

Where to file in Illinois

Business filings: https://www.ilsos.gov/departments/business_services/home.html
Secretary of State: https://www.ilsos.gov
Tax authority: https://tax.illinois.gov
Labor/workforce: https://ides.illinois.gov

Heads up: A common Illinois mistake: assuming this llc formation covers your city and county requirements too. It usually doesn't. Check your city's business division separately — most cities in Illinois require their own general business license on top of state filings.

Related permits in Illinois

Business License in Illinois Sales Tax Registration in Illinois Employer Registration in Illinois DBA Filing in Illinois

Frequently asked questions

How much does a llc formation cost in Illinois?

Typical cost ranges from $50–$500. The exact fee depends on your specific business type, city, and any expedited processing you choose.

How long does it take to get a llc formation in Illinois?

Most Illinois applications complete in 1–20 days. Same-day or next-day processing is often available for an added fee at the state level.

Do I need a llc formation if I'm just starting a home business in Illinois?

In most cases, yes — even home-based businesses in Illinois are subject to the same state filing rules. Local rules (city and county) may add a home occupation permit on top.

This page reflects general Illinois filing rules as of 2026. Fees and processing times change; verify the current amounts with the linked state agency before filing.