How to Form an LLC in Illinois

This guide to starting an LLC in Illinois provides step-by-step instructions on filing formation documents, obtaining tax IDs, and setting up company records.


LLCs are the most popular business structure because they are inexpensive to form, provide flexibility to the owners, and are easy to run. Forming your LLC legally establishes your business, limits your personal liability, and gains tax flexibility. The following step-by-step will help you as you undertake this process.

Fast Facts: Your Budget and Timeline

Here is an overview of the total paperwork, cost, and time it takes to form an LLC in Illinois. Be sure to read the final step in this guide - "Ongoing Filings" - to understand your ongoing costs to maintain a compliant Illinois LLC.

  • Form LLC-5.5: Illinois Limited Liability Company Act Articles of Organization
  • Operating Agreement
  • IRS Form SS-4: Obtain an EIN
  • Form REG-1: Illinois Business Registration Application
  • Formation: $500 + optional $100 expedite fee
  • Illinois business registration: state fee varies depending on tax accounts needed
  • Formation: Immediately online. ~2 weeks by mail or fax. ~1 business days with $100 expedite fee.

Step-by-Step Illinois LLC Instructions


Illinois LLCs must pay a $250 Secretary of State annual report fee every year by the anniversary of their formation.

  1. Check Name Availability

    The legal name of your LLC may not conflict with any other registered name. Check availability of your desired name by conducting a name search.

    Name Search: Illinois Secretary of State - Business Services Department
    Name search
    Name Reservation: Optional

    Shall contain the terms "limited liability company", "L.L.C.", or "LLC", or, if organized as a low-profit limited liability company under Section 1-26 of this Act, shall contain the term "L3C". Shall consist of letters of the English alphabet, Arabic or Roman numerals, or symbols capable of being readily reproduced by the Office of the Secretary of State; shall be the name under which the limited liability company transacts business in this State unless the limited liability company also elects to adopt an assumed name or names as provided in this Act; shall contain the word "trust", if it is a limited liability company organized for the purpose of accepting and executing trusts. 
    805 ILCS §180/1-10

  2. Appoint a Registered Agent

    Before you officially file to create your Illinois LLC, you will need to decide who your Illinois registered agent will be. A registered agent is a business's legal appointee to receive notice of lawsuit and other legal or government notices.

    State law requires every LLC to have a registered agent. The registered agent is designated when you file Illinois articles of organization with the Illinois Secretary of State - Business Services Department.

    Our reliable registered agent service fulfills this requirement. You get:

    • Same-day documents from our local office in Springfield
    • Immediate online access to state forms with our address and, where required, our signature
    • Annual fees from $89 to $99 per state with no additional charges

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  3. File Illinois Certificate of Formation

    File the articles of organization to create your limited liability company.

    Agency:Illinois Secretary of State - Business Services Department

    Form LLC 5.5: Articles of Organization


    Pub c334: A Guide for Organizing Domestic Limited Liability Companies

    Filing Method:

    Mail, fax (only if you have a prepaid account), or online

    Agency Fee:

    $150 + optional $100 expedite fee. The expedite fee is required if you file online.


    ~2 weeks by mail or fax. ~1 business days with $100 expedite fee.


    805 ILCS 180

    • When you file by mail you must submit the original articles with signatures in black ink and one copy.
    • In addition to a traditional LLC, Illinois offer a Series LLC and L3C. They each have special formation requirements.
    • When you file online, you may return to the Secretary of State’s Web site after 24 hours and retrieve a copy of the document at no extra charge for a period of 30 days.
  4. Establish Company Records

    Your LLC must keep correct and complete books and records. Your filed articles of organization are the first documents for your LLC’s records. Your LLC will generate many other official records such as:

    • Meeting minutes
    • Operating agreement
    • EIN verification letter
    • Amendments and other filings made to the LLC throughout its lifetime

    Organizations need a secure, centralized tool for managing and accessing sensitive records. Our Records Manager software offers a simple, efficient way for LLCs to store records, track members and managers, and customize meeting notifications.

  5. Create the Operating Agreement

    Draft an Operating Agreement (potentially using a template) which is the governing document for the LLC. It defines the formalities of how the LLC will run itself such as holding an annual meeting. You will review and adopt the agreement at your organizational meeting.

  6. Hold the Organizational Meeting

    The first meeting of the members of the LLC is the organizational meeting. You will need your filed articles of organization and your operating agreement in order to conduct this meeting. Keep minutes of this meeting and store them in your company record book.

  7. Get a Federal Employer Identification Number (EIN)

    If your LLC has more than one member or will hire employees, it must obtain an EIN. An EIN is also often required to open a bank account.

    Agency:Internal Revenue Service (IRS)

    IRS Form SS-4

    Filing Method:

    Mail, phone, fax, or online.

    IRS fee:



    Immediately online or by phone. 4 business days by fax. 4-5 weeks by mail.


    The IRS website is only available during certain hours. Print your EIN before closing your session. For additional guidance, see IRS Pub 1635: Understanding Your EIN.

  8. Get Illinois State Tax Identification Numbers/Accounts

    Illinois offers a consolidated state tax registration application.

    Submit to:
    Illinois Department of Revenue
    Form REG-1: Illinois Business Registration Application
    Filing Method:
    Mail or online
    State fee varies depending on tax accounts needed
  9. Consider Electing S-Corp or C-Corp Taxation

    By default, your LLC receives pass-through taxation and the vast majority of LLCs keep this tax classification. Some LLCs benefit from electing S-Corp or C-Corp tax treatment:

    • S-Corp treatment can help owner-employees who earn more than ~$75,000 per year save on self-employment taxes. File Form 2553: S-Corp Election.
    • C-Corps suffer from double taxation: the corporation pays taxes on profits then members pay taxes on their distributions. If profits exceed $250,000 per owner, you provide employee benefits, or you will re-invest most of your profit in the business, you may benefit from the low tax rates on retained earnings under C-Corp treatment. File Form 8832: C-Corp Election.
  10. Obtain Business Licenses & Permits

    To run your business legally, you must obtain applicable licenses and permits. The easiest way to navigate the wide range of federal, state, and local requirements is to search by your business type and locality using the Small Business Administration Business License & Permit look-up tool.

    Illinois Business License

    Not required

    General Business License licensure is not required on the State level in Illinois.

    Illinois does not have a general business license at the state level, but local licenses are often required.

  11. Ongoing Filings to Maintain Your LLC

    You must file federal and state tax returns.

    Many states also require business entities to file an annual report to maintain good standing with the secretary of state. If an annual report is required for LLCs formed in Illinois, view the table below.

    Domestic Illinois Corporation Annual Report Requirements:

    Agency:Illinois Secretary of State - Business Services Department

    BCA 14.05 D: Domestic Corporation Annual Report

    Filing Method:

    Mail or online.

    Agency Fee:

    $75 annual report fee + franchise tax (varies) +$1.69 transaction fee


    Annually by the end of the month prior to the registration anniversary month. So if you incorporated on February 14th, then your annual report is due January 31.


    805 ILCS 5/14.05


    Late fee is calculated based on franchise tax due.

    • The report must be signed by an officer named in the report.
    • You must submit original signatures.
    • Changing your registered agent requires submitting a separate form.

    For more details, see our Illinois annual report information center page.

    As your LLC grows, you will need to demonstrate your company’s good standing to banks, customers, and other state agencies. After all the work involved in forming your Illinois LLC, don’t let a missed annual report filing cause your new business to fall out of compliance.

    Tracking and filing annual reports on your own can be time consuming and lead to accidental lapses. Protect your LLC’s good standing with Managed Annual Report Service, which tracks and automatically files reports on time, every time, so you can focus on your business.

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