The explanation · Illinois
3 Best Registered Agents in Illinois (2026), Compared
In brief
- Does the law demand one?
- Yes, by law
- Title used by the law
- Registered agent
- Price of a service
- $99 to $149 every year
- Our picks in order
- Mainstay Filing, IL Registered Agent.org then Illinois Registered Agent.co
Services we would pick in Illinois
The order comes from our method: three-year cost first, then how much work the price covers.1. Mainstay Filing: best for one price in any state
$149 a year, then $149 at renewal
Mainstay Filing is where we would start in Illinois. In short, the price is $149 a year wherever the LLC is registered.
IL Registered Agent.org would save $150 over three years but covers Illinois only.
Includes
- A street address in the state
- Up to three government mailings a year scanned for free
- Works for LLCs, corporations, LPs, LLPs and nonprofits
Points in its favor
- Usable wherever the LLC registers
- A fixed $149 each year
Where it falls short
- $50 more a year than IL Registered Agent.org
- Report filing requires the formation package
2. IL Registered Agent.org: best for one-state companies
$99 a year, then $99 at renewal
IL Registered Agent.org ranks second. In short, it charges $99 a year, renewing at $99, for an LLC that remains in Illinois.
Includes
- An in-state office address
- Document scans in your account
Points in its favor
- $99 per year
- Wins on yearly price against Mainstay Filing
Where it falls short
- Another state needs another agent
- The Limited Liability Company Annual Report is left to you to file
3. Illinois Registered Agent.co: best for a second local choice
$99 a year, then $99 at renewal
Illinois Registered Agent.co ranks third. In short, it charges $99 a year, renewing at $99, for an LLC that remains in Illinois.
With the same prices as IL Registered Agent.org, this is a near tie.
Includes
- An in-state office address
- Document scans in your account
Points in its favor
- $99 per year
- Wins on yearly price against Mainstay Filing
Where it falls short
- Another state needs another agent
- The Limited Liability Company Annual Report is left to you to file
How they stack up
| # | Company | First-year price | Each year after | Total, 3 years | Covers | |
|---|---|---|---|---|---|---|
| 1 | Mainstay Filing | $149 | $149/yr | $447 | A street address in the state; up to three government mailings a year scanned for free; Works for LLCs, corporations, LPs, LLPs and nonprofits | Open Mainstay FilingPartner link. We may earn money if you buy. |
| 2 | IL Registered Agent.org | $99 | $99/yr | $297 | An in-state office address; document scans in your account | Open IL Registered Agent.orgPartner link. We may earn money if you buy. |
| 3 | Illinois Registered Agent.co | $99 | $99/yr | $297 | An in-state office address; document scans in your account | Open Illinois Registered Agent.coPartner link. We may earn money if you buy. |
Explanations
Is naming a registered agent optional?
Every LLC must name a registered agent with an in-state street address.
The governing law: 805 ILCS 180/1-35. see ilga.gov, October 2026
Can just anyone act as agent?
An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent.
You can fill the role yourself for free if you qualify.
How much does an agent charge?
Between $99 to $149 per year; $297 to $447 over three years.
Choosing a different agent does not change any state fee.
What does the agent handle?
It receives legal documents for the LLC at an address in Illinois.
If papers arrive and nobody takes them, a case could proceed without you. What does service of process mean?
What does the LLC owe the state every year?
One filing repeats: the Limited Liability Company Annual Report, once a year, costing $75. Filings fall due before the first day of the entity's anniversary month, a date worth noting down.
see ilsos.gov, October 2026
What decided the ranking?
It is how much work the price handles, weighted at 28%, that puts Mainstay Filing first.
Most of the score, 62%, comes from what three years cost and how much work the price handles.
We weigh where a service can be used, and only the first pick can be used anywhere.
What Illinois requires
| Requirement | Fee or rule | Reference |
|---|---|---|
| Filing fee | $150 | see ilsos.gov, October 2026 |
| Registered agent | Yes, by law | see ilga.gov, October 2026 |
| Limited Liability Company Annual Report | $75 every year | see ilsos.gov, October 2026 |
| Paid to the state in three years | $300 | Added up from the rows above |
Other things people ask
May I be my own agent?
Yes, as long as your address and status match what the state demands.
What kind of address does the agent need?
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.
What are the three-year totals?
Mainstay Filing: $447 | IL Registered Agent.org: $297 | Illinois Registered Agent.co: $297
What are the figures based on?
State fees come from Illinois's official sources, cited by each figure. Service prices come from each company's own pricing page.
Is hiring anyone mandatory?
It is optional, and the state charges the same either way.
Which company ranks first in Illinois?
Mainstay Filing comes first: $149 a year covers an agent in this state and in any state you add. After it come IL Registered Agent.org and Illinois Registered Agent.co.
Official sources and price pages
- ilsos.gov: Illinois Secretary of State, Department (confirmed August 2026)
- ilsos.gov: Illinois Secretary of State, Department (confirmed August 2026)
- ilga.gov: 805 ILCS 180/5-5 (confirmed August 2026)
- ilga.gov: Illinois formation fee: Filing fee (confirmed October 2026)
- ilsos.gov: Illinois formation fee: Filing fee (confirmed October 2026)
- ilga.gov: Illinois registered agent statute (confirmed October 2026)
- Fetched November 13, 2026: the Mainstay Filing Illinois service page
- Fetched November 13, 2026: the IL Registered Agent.org pricing page
- Fetched November 13, 2026: the Illinois Registered Agent.co pricing page