3 Best Foreign Registration Services in Illinois (2026): Your Questions Answered
In Illinois for 2026, our answer on foreign registration services is IL Registered Agent.org ($199), Mainstay Filing ($199) and Illinois Registered Agent.co ($199), ranked from first to last. Every option pays Illinois $150, then $397 to $497 to a service across three years.
Answered by the Ask About LLC editorial team ·
The short answers
State fee to register
$150
Home-state certificate?
Yes, attach it (60 days old at most)
Once registered
$75, annual report
Who to ask
IL Registered Agent.org, Mainstay Filing then Illinois Registered Agent.co
Prices as of November 13, 2026. The state's own fees are in the checklist below.
What owners want to know
When must an out-of-state LLC register here?
Register with the Illinois Secretary of State, Department of Business Services, Limited Liability Division before your LLC starts doing business in Illinois.
An unregistered LLC risks the state's courts will not hear its claims (805 ILCS 180/45-45(a)); fees owed for the gap before registering.
Over three years the state's fees reach $300, counting any recurring report. looked up at ilsos.gov in October 2026 to confirm
What registers the LLC?
Send the Application for Admission to Transact Business (Form LLC-45.5) to the Illinois Secretary of State, Department of Business Services, Limited Liability Division; the registration is complete when it accepts the filing.
Enclose certificate of Good Standing or Existence issued within the last 60 days.
Is there a filing that repeats?
Afterward comes a annual report at $75.
Timing, in the state's words: Within the 60 days before your anniversary month.
What put number one on top?
On what you pay over three years, worth 33%, IL Registered Agent.org comes out ahead.
Two questions carry most of the weight, what you pay over three years (33%) and chores the price takes care of (29%), and three smaller ones follow.
Three years at IL Registered Agent.org cost $397, $100 less than Mainstay Filing.
The last row is arithmetic, not a state figure: filing fee, plus the reports due in years two and three, plus a minimum tax where one applies. Open-ended costs stay out.
Questions people also ask
Does the state where I formed the LLC still need an agent?
Yes, and the two states do not share a rule book. Mainstay Filing works in both, so one account can cover the home state and this one.
What do the picks cost over three years?
For three years you would pay $397 at IL Registered Agent.org, $497 at Mainstay Filing, $397 at Illinois Registered Agent.co, with state fees on top.
Where do these numbers come from?
Official Illinois sources back the state side, and posted company prices back the service side.
Does the law require a service?
Hiring help is a convenience you pay for, never a legal duty.
Can I hire someone to register the LLC?
They do. All the picks prepare and send the registration, so the only thing that changes with your choice is the service fee.
What is the best foreign registration service for Illinois?
IL Registered Agent.org comes first: registering costs $199 over the state fee, with the agent covered in year one, then $99 a year. Next are Mainstay Filing and Illinois Registered Agent.co.
Sources for this answer
Our answer on Illinois Secretary of State, Department rests on ilsos.gov, a page we confirmed August 2026 and still point you to
Our answer on Illinois Secretary of State, Department rests on ilsos.gov, a page we confirmed August 2026 and still point you to
Our answer on 805 ILCS 180/5-5 rests on ilga.gov, a page we confirmed August 2026 and still point you to
Our answer on Illinois formation fee: Filing fee rests on ilga.gov, a page we confirmed October 2026 and still point you to
Our answer on Illinois formation fee: Filing fee rests on ilsos.gov, a page we confirmed October 2026 and still point you to
Our answer on Illinois registered agent statute rests on ilga.gov, a page we confirmed October 2026 and still point you to
Our answer on Form LLC-45.5, Application for Admission rests on ilsos.gov, a page we confirmed October 2026 and still point you to
Our answer on Form LLC-45.40, Application for Withdrawal rests on ilsos.gov, a page we confirmed October 2026 and still point you to
Our answer on 805 ILCS 180/45-45, consequences of rests on ilga.gov, a page we confirmed October 2026 and still point you to
Our answer on 805 ILCS 180/45-47, activities that rests on ilga.gov, a page we confirmed October 2026 and still point you to
Our answer on 805 ILCS 180/45-45 rests on ilga.gov, a page we confirmed November 2026 and still point you to
The IL Registered Agent.org pricing page, as it stood on November 13, 2026
The Mainstay Filing Illinois service page, as it stood on November 13, 2026
The Illinois Registered Agent.co pricing page, as it stood on November 13, 2026