How to form an Illinois LLC (Limited Liability Company)

Initial Costs

$500 Filing Fee. $600 For Online Filings.

Filing Time

2 to 3 Weeks by Mail; 1 to 5 Days Online

Ways to File

Mail, In Person, Online

Organizing an Illinois LLC

An Illinois limited liability company is formed by submitting in duplicate the Certificate of Organization for Limited Liability Company, LLC-5.5 and paying the filing fee to Illinois Secretary of State, Department of Business Services. Submit the form in by mail, fax, in person or online. The filing fee is $500. Fax filing is allowed with a pre-paid account only. All LLCs processed online will be filed on an expedited basis with an additional $100. Expedited processing is reviewed in four or five days. Standard processing is finished in approximately three weeks.

Illinois Series LLC

Illinois permits the organization of “Series LLC,” which has the ability to create within itself separate cells that have their own interests, liabilities and members. An example would be a company that owns several rental properties. This can separate the various properties into separate series, thus segregating the liabilities. Submit in duplicate the completed Articles of Organization, LLC-5.5(S) with the $750 filing fee.

Qualification of a Foreign LLC in Illinois

Register your foreign LLC to do business in Illinois by filing in duplicate the Application for Admission to Transact Business with the Illinois Secretary of State, Department of Business Services by mail, in person or online with the $500 filing fee. Also, attach a certified copy of the articles of organization, any amendments and a certificate of good standing or existence, authenticated within 60 days, by an officer of the state wherein the LLC is formed.

Illinois Secretary of State


Check name availability:

Illinois LLC Law

Name: Illinois Limited Liability Company Act

Illinois Compiled Statutes – §§ (805ISCS 180) Limited Liability Act.

Series LLC: Yes

Filing Fee for Illinois LLC: Domestic $500; Foreign $500; LLC Series: $750.

Illinois LLC Fees

Articles of Amendment: $150
Registered Agent or Address Change: $25
Application for Reinstatement: $500
Articles of Dissolution: $100
Limited Liability Company Annual Report: $250
Application for Withdrawal Foreign: $100

Available LLC Formation Services in Illinois

LLC Center Publications recommends Northwest Registered Agent LLC to form your Illinois Limited Liability Company.

Secretary of State Information

Physical Address:

Springfield Office:
Department of Business Services
Limited Liability Division
501 S. Second Street, Rm 351
Springfield, IL 62756

Mailing Address:

Chicago Office:
69 W. Washington
Suite 1240
Chicago, IL 60602


(217) 524-8008 (Springfield)
(312) 793-3380 (Chicago)