Registering an out-of-state LLC in Illinois
An LLC formed in another state pays $150 to register in Illinois, then files the same recurring reports as a Illinois LLC.
Foreign LLC in Illinois
Partly unverifiedState fees only · retrieved 2026-10-20
Application for Admission to Transact Business (Form LLC-45.5)source$150
Annual Reportsource$75 / yr
Year one$150
Every year after (average)$75
5-year total$450
When you need to register
If your LLC was formed in another state but "transacts business" in Illinois — an office, employees, or regular in-state operations — Illinois generally requires you to register before you do business here. You file Application for Admission to Transact Business (Form LLC-45.5) with the Illinois Secretary of State, Department of Business Services; see the official fee.
Your home state keeps charging its own fees too, so the true cost is both states added together.