Plain and short · Illinois
3 Best Registered Agents in Illinois (2026) and What Illinois Requires
The short version
- Must an LLC name one?
- Required: yes
- Statute's word
- Registered agent
- Typical price
- $99 to $149 per year
- Ranked first
- Mainstay Filing, Illinois Registered Agent.co then IL Registered Agent.org
Ranked in Illinois
Prices come from each company's own page. Method.1. Mainstay Filing: best for one price in every state
Year one $149. Later years $149
Mainstay Filing ranks first in Illinois. A single yearly price, $149, follows the LLC across state lines.
Illinois Registered Agent.co costs $150 less over three years. It works only in Illinois.
Includes
- An in-state street address
- Three government mailings a year scanned free
- Serves LLCs, corporations, LPs, LLPs and nonprofits
Good
- One account works in any state
- Just $149 a year
Against
- Illinois Registered Agent.co is $50 less each year
- You still file reports
2. Illinois Registered Agent.co: best for one-state companies
Year one $99. Later years $99
Illinois Registered Agent.co takes second place because the local price is $99 a year, $99 at renewal, for one state.
Includes
- A local address
- Scans of legal papers
Good
- $99 a year, flat at renewal
- A lower yearly bill than the national pick
Against
- Nothing outside the state
- Leaves the Limited Liability Company Annual Report on your desk
3. IL Registered Agent.org: best for another local option
Year one $99. Later years $99
IL Registered Agent.org takes third place because the local price is $99 a year, $99 at renewal, for one state.
It charges what Illinois Registered Agent.co charges.
Includes
- A local address
- Scans of legal papers
Good
- $99 a year, flat at renewal
- A lower yearly bill than the national pick
Against
- Nothing outside the state
- Leaves the Limited Liability Company Annual Report on your desk
Side by side
| # | Company | Start | After year one | Three years | Covers | |
|---|---|---|---|---|---|---|
| 1 | Mainstay Filing | $149 | $149/yr | $447 | An in-state street address; three government mailings a year scanned free; Serves LLCs, corporations, LPs, LLPs and nonprofits | Visit Mainstay FilingPartner link. We may earn money if you buy. |
| 2 | Illinois Registered Agent.co | $99 | $99/yr | $297 | A local address; scans of legal papers | Visit Illinois Registered Agent.coPartner link. We may earn money if you buy. |
| 3 | IL Registered Agent.org | $99 | $99/yr | $297 | A local address; scans of legal papers | Visit IL Registered Agent.orgPartner link. We may earn money if you buy. |
Key questions
Is a registered agent required?
Every LLC must name a registered agent with an in-state street address.
Law: 805 ILCS 180/1-35. from ilga.gov, October 2026, kept short
Who may be the agent?
An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent.
If you qualify, you can be your own agent at no cost.
What does an agent cost?
$99 to $149 a year with the services we rank. $297 to $447 over three years.
Whichever agent you name, the state's fees stay the same.
What does an agent do?
It receives lawsuits and official state mail for the LLC at an address in Illinois.
If papers arrive and nobody accepts them, a case can proceed without the LLC. Service of process, defined
What else is due each year?
Expect the Limited Liability Company Annual Report every year, $75. Its date, set by the state, reads before the first day of the entity's anniversary month, which you should keep in view.
from ilsos.gov, October 2026, kept short
Why this order?
Mainstay Filing wins on work included. That check carries 27%.
Five checks: three-year cost (38%), work included (27%), readable pricing (13%), renewal steadiness (11%) and state coverage (11%).
Illinois Registered Agent.co is the smaller bill. It serves Illinois alone.
Illinois agent rules, sourced
| Item | Detail | Confirm |
|---|---|---|
| LLC filing fee | $150 | from ilsos.gov, October 2026, kept short |
| Registered agent | Required: yes | from ilga.gov, October 2026, kept short |
| Limited Liability Company Annual Report | $75 every year | from ilsos.gov, October 2026, kept short |
| State fees, three years | $300 | The rows above, added |
Also asked
May I name myself?
Yes, if you meet the state's rules on who may serve and on the address.
What address does an 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?
Across three years: Mainstay Filing at $447, Illinois Registered Agent.co at $297, IL Registered Agent.org at $297
Are the fees official?
Official Illinois sources for the state side. Published prices for the service side.
Must I use a service?
No. Owners may file directly. A service saves time and can act as agent.
Which ranks first in Illinois?
Mainstay Filing, because $149 annually buys the same agent service in all fifty states. Then Illinois Registered Agent.co and IL Registered Agent.org.
Sources
- Charter Simple keeps Illinois Secretary of State, Department on file from ilsos.gov, confirmed August 2026, and nothing more
- Charter Simple keeps Illinois Secretary of State, Department on file from ilsos.gov, confirmed August 2026, and nothing more
- Charter Simple keeps 805 ILCS 180/5-5 on file from ilga.gov, confirmed August 2026, and nothing more
- Charter Simple keeps Illinois formation fee: Filing fee on file from ilga.gov, confirmed October 2026, and nothing more
- Charter Simple keeps Illinois formation fee: Filing fee on file from ilsos.gov, confirmed October 2026, and nothing more
- Charter Simple keeps Illinois registered agent statute on file from ilga.gov, confirmed October 2026, and nothing more
- Mainstay Filing Illinois service page, read November 13, 2026
- Illinois Registered Agent.co pricing page, read November 13, 2026
- IL Registered Agent.org pricing page, read November 13, 2026