3 Best Foreign Registration Services in Illinois (2026): The Straight Story
If you need foreign registration services in Illinois in 2026, here's the order we'd go in: Mainstay Filing ($199), Illinois Registered Agent.co ($199) and IL Registered Agent.org ($199). Illinois charges $150 to register no matter who files, and services add $397 to $497 over three years.
Straight from the LLC Straight Talk editorial team
Quick facts
The short of it
State fee to register
$150
Bring a home-state certificate?
Yes (60 days old, tops)
Once you're registered
$75, annual report
Who we'd use
Mainstay Filing, Illinois Registered Agent.co then IL Registered Agent.org
Prices as of November 13, 2026. The state's own fees are in the checklist below.
What you need to know
When does an out-of-state LLC have to register?
Before your LLC does business in Illinois. You register with the Illinois Secretary of State, Department of Business Services, Limited Liability Division, then you start working.
If you skip it, expect Illinois's courts won't hear its claims (805 ILCS 180/45-45(a)); fees owed for the gap before registering.
ilga.gov, confirmed October 2026, if you don't believe us
How much does registering run?
The state charges $150, and a service adds $199.
Over three years the state's fees reach $300, counting any recurring report. ilsos.gov, confirmed October 2026, if you don't believe us
Which form, and who gets it?
The form's the Application for Admission to Transact Business (Form LLC-45.5), and the Illinois Secretary of State, Department of Business Services, Limited Liability Division gets it.
Include certificate of Good Standing or Existence no older than 60 days.
What do I owe once I'm registered?
Expect the annual report: $75.
Per the state, it's due Within the 60 days before your anniversary month.
What put number one on top?
Mainstay Filing takes jobs the price actually covers, which counts 30%.
Two tests carry most of the weight: money out the door in three years (35%) and jobs the price actually covers (30%).
An out-of-state LLC already works in two states, and the first pick can cover both.
ilsos.gov, confirmed October 2026, if you don't believe us
Good standing certificate
Yes, 60 days
ilga.gov, confirmed October 2026, if you don't believe us
Annual report
$75
ilga.gov, confirmed October 2026, if you don't believe us
What the state collects in three years
$300
The rows above, added up
Here's how we got the last row: filing fee + two reports + minimum tax, if there is one. Costs with no set price aren't in it.
Still wondering?
Does my home state need its own agent?
Yes. Your home state has its own agent rule, and Mainstay Filing can cover both states from one account.
What do the picks cost over three years?
Mainstay Filing comes out at $497; Illinois Registered Agent.co comes out at $397; IL Registered Agent.org comes out at $397, with state fees on top.
Where do these numbers come from?
Each state fee links to its official page, and each service price comes from the company's own site.
Is a service required?
Not required. The state takes filings from owners.
Will a service file it for me?
Yes. Every pick files it, and the state fee's the same whichever you choose.
Who's first in Illinois?
Mainstay Filing is first: it's $199 to register, with a free first registered agent year and $149 a year from then on. Then comes Illinois Registered Agent.co and IL Registered Agent.org.