Register an LLC in Another State

Register an LLC in Another State › Illinois

Register your LLC in Illinois

To register an LLC formed in another state in Illinois, file Form LLC-45.5, Application for Admission to Transact Business with the Illinois Secretary of State, Department of Business Services, Limited Liability Division and pay $150.

Before: at home

Illinois wants proof from the home state: certificate of Good Standing or Existence, no older than 60 days. Order it from the state where the LLC was formed before you file here.

During: in Illinois

File
Form LLC-45.5, Application for Admission to Transact Business
Fee
$150
Agent
A registered agent with a Illinois street address

Best 3 Foreign Registration Services in Illinois (2026)

Rather not file it yourself? For an existing LLC in Illinois these three do it.

1. Mainstay Filing

$199 + $150 state fee = $349

Registered agent free for the first year, then $149 a year.

2. IL Registered Agent.org

$199 + $150 state fee = $349

Registered agent included for the first year, then $99 a year.

3. Illinois Registered Agent.co

$199 + $150 state fee = $349

Registered agent included for the first year, then $99 a year.

Service prices read from each provider’s Illinois page on October 28, 2026. The state fee is the official figure below and is paid to the Illinois Secretary of State, Department of Business Services, Limited Liability Division.

After: staying registered

Annual report (Illinois Secretary of State), $75 (due: within the 60 days before your anniversary month). The services above include the agent for year one.

Illinois questions

Can my existing LLC operate in Illinois?

Yes, once it is registered there. You file Form LLC-45.5, Application for Admission to Transact Business with the Illinois Secretary of State, Department of Business Services, Limited Liability Division and pay $150; you do not form a new LLC.

What do I need from my home state?

Certificate of Good Standing or Existence, no older than 60 days.

What happens after I register in Illinois?

Annual report (Illinois Secretary of State), $75 (due: within the 60 days before your anniversary month), and a registered agent must stay in place.

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