Class 3 · Illinois
Foreign LLC Registration in Illinois (2026): a 5-Step Lesson and the 3 Best Services
This lesson at a glance
Lesson goals
- When the rule applies
- The filing, its fee and its office
- The recurring filing
- How the graded picks compare
Our graded picks for Illinois
1. Illinois Registered Agent.co: best for a low yearly agent cost
First in the class in Illinois is Illinois Registered Agent.co: it files the Illinois registration for $199 and includes a year of agent service, then renews at $99.
Mainstay Filing costs more over three years, and that hands this service the top spot.
What the price covers
- The registration filing
- One year of agent service
Marks in its favor
- $199 to register
- No agent fee in year one
- $99 a year for the agent afterward
Where it loses points
- Your home state needs a separate agent
2. Mainstay Filing: best for a second state and beyond
Next on the report card comes Mainstay Filing, graded second: it files the Illinois registration for $199 plus the state fee and covers the first agent year.
Over three years it costs $100 more than Illinois Registered Agent.co, and cost makes up 32% of the grade.
After year one, the agent costs $149 a year.
What the price covers
- The registration filing
- The registered agent costs nothing in year one
- The same price in any state
Marks in its favor
- Any state at one fee
- Year-one agent included
- $199 on top of Illinois's fee
Where it loses points
- You pay $50 extra a year for the agent
3. IL Registered Agent.org: best for registering only in Illinois
For number 3 we picked IL Registered Agent.org: it files the Illinois registration for $199 and includes a year of agent service, then renews at $99.
On price it is level with Illinois Registered Agent.co.
What the price covers
- The registration filing
- One year of agent service
Marks in its favor
- $199 to register
- No agent fee in year one
- $99 a year for the agent afterward
Where it loses points
- Your home state needs a separate agent
Our Illinois picks side by side
| # | Service | First year | From year two | Three-year total | |
|---|---|---|---|---|---|
| 1 | Illinois Registered Agent.co | $199 | $99/yr | $397 | Visit Illinois Registered Agent.coPartner link. We may earn money if you buy. |
| 2 | Mainstay Filing | $199 | $149/yr | $497 | Visit Mainstay FilingPartner link. We may earn money if you buy. |
| 3 | IL Registered Agent.org | $199 | $99/yr | $397 | Visit IL Registered Agent.orgPartner link. We may earn money if you buy. |
The lesson, step by step
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Step
1Know when registration is needed
If your LLC was formed elsewhere and works in Illinois, it must first register there as a foreign LLC. If the LLC works there without registering: Its own claims cannot go to court in Illinois until the registration is made (805 ILCS 180/45-45(a)). Contracts it already signed are still good (805 ILCS 180/45-45(b)). Expect a bill for fees from before you registered.
Where this comes from: The official page is ilga.gov, last confirmed in October 2026
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Step
2Obtain your home state's certificate
Include certificate of Good Standing or Existence, issued within 60 days.
Time the order so the certificate is recent at filing.
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Step
3Choose the Illinois registered agent
Every LLC must name a registered agent with an in-state street address. The address has to be a registered office in Illinois that matches the agent's business office. A P.O. box alone is not accepted.
Our graded picks all serve as the registered agent.
Where this comes from: The official page is ilga.gov, last confirmed in October 2026
-
Step
4Turn in the Application for Admission to Transact Business
Pay $150 when you deliver the form to the Illinois Secretary of State, Department of Business Services, Limited Liability Division.
Where this comes from: The official page is ilsos.gov, last confirmed in October 2026
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Step
5Keep the registration active
What recurs is the annual report, $75, within the 60 days before your anniversary month.
Costs, step by step
| Item | Who you pay | Total |
|---|---|---|
| Registration fee | State office | $150 |
| Annual report | State office | $75 |
| Help from a service | Your service | $199 up front |
| State fees, years one to three | State office | $300 |
Behind the ranking
What settled it was tuition over three years, worth 32% of the grade.
Paying Illinois Registered Agent.co for three years adds up to $397, which is $100 below the Mainstay Filing total.
Test yourself on Illinois
Which fees come with a foreign LLC registration in Illinois?
$150 as the official fee. Our picks add $199.
Which form do I file to register?
Look for the Application for Admission to Transact Business (Form LLC-45.5); you deliver it to the Illinois Secretary of State, Department of Business Services, Limited Liability Division.
Do I need a certificate from my home state?
Yes: certificate of Good Standing or Existence, issued within 60 days of filing.
What if the LLC does business there without registering?
Its own claims cannot go to court in Illinois until the registration is made (805 ILCS 180/45-45(a)). Contracts it already signed are still good (805 ILCS 180/45-45(b)). Expect a bill for fees from before you registered.
What is due after registering?
Keep the registration alive by filing the annual report; the fee is $75.
Which service should handle the registration?
Illinois Registered Agent.co first, then Mainstay Filing and IL Registered Agent.org; Illinois Registered Agent.co leads on tuition over three years.
Class references
- Want to see Illinois Secretary of State, Department of Business Services for yourself? Open ilsos.gov. We confirmed that page in August 2026 before writing the lesson.
- Want to see Illinois Secretary of State, Department of Business Services for yourself? Open ilsos.gov. We confirmed that page in August 2026 before writing the lesson.
- Want to see 805 ILCS 180/5-5 for yourself? Open ilga.gov. We confirmed that page in August 2026 before writing the lesson.
- Want to see Illinois formation fee: Filing fee, official source for yourself? Open ilga.gov. We confirmed that page in October 2026 before writing the lesson.
- Want to see Illinois formation fee: Filing fee, official source for yourself? Open ilsos.gov. We confirmed that page in October 2026 before writing the lesson.
- Want to see Illinois registered agent statute for yourself? Open ilga.gov. We confirmed that page in October 2026 before writing the lesson.
- Want to see Form LLC-45.5, Application for Admission for yourself? Open ilsos.gov. We confirmed that page in October 2026 before writing the lesson.
- Want to see Form LLC-45.40, Application for Withdrawal for yourself? Open ilsos.gov. We confirmed that page in October 2026 before writing the lesson.
- Want to see 805 ILCS 180/45-45, consequences of transacting business without for yourself? Open ilga.gov. We confirmed that page in October 2026 before writing the lesson.
- Want to see 805 ILCS 180/45-47, activities that are not transacting for yourself? Open ilga.gov. We confirmed that page in October 2026 before writing the lesson.
- Want to see 805 ILCS 180/45-45 for yourself? Open ilga.gov. We confirmed that page in November 2026 before writing the lesson.
- Prices taken from the pricing page of Illinois Registered Agent.co on November 13, 2026
- Prices taken from the Illinois service page of Mainstay Filing on November 13, 2026
- Prices taken from the pricing page of IL Registered Agent.org on November 13, 2026