How Do I Register an Out of State Business in Illinois?

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Registering a Foreign Business in Illinois

To register your foreign business in Illinois, you must file an Application for Admission to Transact Company with the Illinois Secretary of State (SOS). If you have a typical limited liability company (LLC), you will use Form LLC-45.5. If you have a series LLC, use Form LLC-45.5(S).

  1. Initial Steps

    • Choose a business idea and legal entity.
    • Choose a business name and form your business with the State of Illinois.
    • Register for business taxes.
    • Apply for relevant licenses and permits.

  2. Additional Requirements

    • If you conduct other business in Illinois, you will need to file for qualification.
    • You will need a recent certified copy of your incorporation documents and a Certificate of Good Standing.
    • You will also need an Illinois registered agent.

  3. Sales Tax Permit

    • Most businesses starting in Illinois selling products or services will need a sales tax permit from the Department of Revenue. This is required when a business has sales tax nexus.

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