Explained · Illinois
3 Best Foreign Registration Services in Illinois (2026), Explained
The essentials
- What the state charges
- $150
- Certificate from your home state?
- Yes (60 days or newer)
- What comes next
- $75, annual report
- Our picks in order
- IL Registered Agent.org, Mainstay Filing then Illinois Registered Agent.co
Illinois: the ranked picks
The order comes from our method: three-year cost first, then how much work the price covers.1. IL Registered Agent.org: best for a budget registration
$199 to register, $99 for the agent later
IL Registered Agent.org is where we would start in Illinois. In short, you pay $199 above the state fee, and $99 every year after.
A lower three-year total than Mainstay Filing gives it the lead for a company that stays put.
Includes
- Registration filed for you
- Agent included for the first year
Points in its favor
- Includes a first year of agent service
- Registers for $199
- A modest renewal of $99
Where it falls short
- A separate agent is needed in the home state
2. Mainstay Filing: best for adding several states
$199 to register, $149 for the agent later
Mainstay Filing ranks second. In short, its $199 fee is the same in every state, and the first year of registered agent service is included.
It costs $100 more than IL Registered Agent.org across three years, and cost weighs the most in our ranking.
The registered agent costs $149 annually from year two onward, in every state.
Includes
- Registration paperwork done for you
- Registered agent, no charge in the first year
- Same service fee wherever you register
Points in its favor
- $199, with state fees extra
- Registered agent costs nothing in year one
- Identical fee in every state
Where it falls short
- IL Registered Agent.org charges $50 less to renew the agent
3. Illinois Registered Agent.co: best for another in-state filer
$199 to register, $99 for the agent later
Illinois Registered Agent.co ranks third. In short, you pay $199 above the state fee, and $99 every year after.
The prices match IL Registered Agent.org, so pick the one you prefer.
Includes
- Registration filed for you
- Agent included for the first year
Points in its favor
- Includes a first year of agent service
- Registers for $199
- A modest renewal of $99
Where it falls short
- A separate agent is needed in the home state
The picks compared
| # | Company | Year one | Each year after | Three-year total | Included in the price | |
|---|---|---|---|---|---|---|
| 1 | IL Registered Agent.org | $199 | $99/yr | $397 | registration filed for you; agent included for the first year | Check IL Registered Agent.orgPartner link. We may earn money if you buy. |
| 2 | Mainstay Filing | $199 | $149/yr | $497 | registration paperwork done for you; registered agent, no charge in the first year; same service fee wherever you register | Check Mainstay FilingPartner link. We may earn money if you buy. |
| 3 | Illinois Registered Agent.co | $199 | $99/yr | $397 | registration filed for you; agent included for the first year | Check Illinois Registered Agent.coPartner link. We may earn money if you buy. |
Explanations
Does my LLC from another state have to register?
If an LLC formed in another state wants to do business in Illinois, it registers beforehand.
The price of not registering includes it cannot sue as a plaintiff (805 ILCS 180/45-45(a)); the fees it would have paid.
ilga.gov, confirmed October 2026
What will registering set me back?
$150 in state fees, plus $199 for a service.
Total state fees across three years: $300. ilsos.gov, confirmed October 2026
What is the application called?
The Illinois Secretary of State, Department of Business Services, Limited Liability Division takes the Application for Admission to Transact Business (Form LLC-45.5) from LLCs formed in other states.
The filing needs certificate of Good Standing or Existence no more than 60 days.
Is there a recurring filing?
A recurring annual report ($75).
Filings come due Within the 60 days before your anniversary month.
Why is the order what it is?
The deciding factor is what three years cost (34% of the weight), where IL Registered Agent.org is strongest.
Our weighting leans on what three years cost first and how much work the price handles second, then three smaller factors.
Picking IL Registered Agent.org leaves $100 in your pocket after three years compared with Mainstay Filing.
Official Illinois requirements
| Item | Detail | Reference |
|---|---|---|
| Fee to register | $150 | ilsos.gov, confirmed October 2026 |
| Home-state certificate | Yes, 60 days | ilga.gov, confirmed October 2026 |
| Annual report | $75 | ilga.gov, confirmed October 2026 |
| Paid to the state in three years | $300 | Our total of the rows above |
Additional questions
Does my home state still require an agent?
Generally yes. A nationwide provider can serve both states, while a local one cannot.
How much is each one after three years?
IL Registered Agent.org at $397, Mainstay Filing at $497, Illinois Registered Agent.co at $397, not counting state fees.
Are the figures official?
Official schedules for state fees, company pricing for service fees, and every figure carries a date.
Is a service required?
No law demands one. A service is a convenience.
Do these services handle the filing?
Yes. Every pick files it for you, and the state fee is the same either way.
Who would you hire first in Illinois?
IL Registered Agent.org comes first: it charges $199 plus the state fee, with the agent included in year one, then $99 a year. After it come Mainstay Filing and Illinois Registered Agent.co.
References
- Reference: Illinois Secretary of State, Department at ilsos.gov, checked in August 2026
- Reference: Illinois Secretary of State, Department at ilsos.gov, checked in August 2026
- Reference: 805 ILCS 180/5-5 at ilga.gov, checked in August 2026
- Reference: Illinois formation fee: Filing fee at ilga.gov, checked in October 2026
- Reference: Illinois formation fee: Filing fee at ilsos.gov, checked in October 2026
- Reference: Illinois registered agent statute at ilga.gov, checked in October 2026
- Reference: Form LLC-45.5, Application for Admission at ilsos.gov, checked in October 2026
- Reference: Form LLC-45.40, Application for Withdrawal at ilsos.gov, checked in October 2026
- Reference: 805 ILCS 180/45-45, consequences of at ilga.gov, checked in October 2026
- Reference: 805 ILCS 180/45-47, activities that at ilga.gov, checked in October 2026
- Reference: 805 ILCS 180/45-45 at ilga.gov, checked in November 2026
- IL Registered Agent.org, pricing page, accessed November 13, 2026
- Mainstay Filing, Illinois service page, accessed November 13, 2026
- Illinois Registered Agent.co, pricing page, accessed November 13, 2026