3 Best Registered Agents in Illinois (2026): Your Questions Answered
Wondering about registered agents in Illinois, for 2026 our order is IL Registered Agent.org ($99 a year), Mainstay Filing ($149 a year) and Illinois Registered Agent.co ($99 a year). An agent costs $99 to $149 in the first year and $297 to $447 across three years.
Answered by the Ask About LLC editorial team ·
The short answers
Is an agent required?
Yes, the law says so
Title in the statute
Registered agent
Typical agent price
$99 to $149 a year
Who to ask
IL Registered Agent.org, Mainstay Filing then Illinois Registered Agent.co
Read on November 13, 2026; three years means year one plus two renewals.
What owners want to know
Do I have to name a registered agent?
Every LLC must name a registered agent with an in-state street address.
Statute: 805 ILCS 180/1-35. looked up at ilga.gov in October 2026 to confirm
Can I name anyone?
An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent.
A qualifying owner can serve at no cost.
What will I pay an agent each year?
$99 to $149 a year with the services we recommend, which works out to $297 to $447 over three years.
No state fee depends on which agent you name.
What does an agent do for the LLC?
The agent signs for lawsuits and state mail addressed to the LLC, using a street address in Illinois.
A good agent tells you quickly when something arrives, which is worth asking about before you sign up. What is service of process?
Is anything else due every year?
One filing keeps coming back: the Limited Liability Company Annual Report, each year, for $75. The state says it is due before the first day of the entity's anniversary month.
IL Registered Agent.org does best on what you pay over three years, which carries 33% of our score.
We weigh five questions: what you pay over three years (33%), chores the price takes care of (29%), answers on the price page (14%), what happens at renewal (13%) and room to add states (11%).
Pick IL Registered Agent.org over Mainstay Filing and keep $150 across three years.
How was the bottom line figured? Add the filing fee, the next two reports and the minimum tax if the state has one. Anything with no fixed price, a newspaper notice for instance, is described above and kept out of the sum.
Still wondering?
Is it allowed to name myself?
Often you can. If your address and status match what the state demands, nothing stands in the way.
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.
Official Illinois sources back the state side, and posted company prices back the service side.
Do I have to use a service?
No. What the law asks for is a filing, and it does not say who has to send it.
Who should I ask first about a registered agent in Illinois?
IL Registered Agent.org, because the service is $99 annually and puts a street address on file. After that, Mainstay Filing and Illinois Registered Agent.co.
Where did we look this up?
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
IL Registered Agent.org pricing page, read November 13, 2026
Mainstay Filing Illinois service page, read November 13, 2026
Illinois Registered Agent.co pricing page, read November 13, 2026