How to Get a Registered Agent in Illinois (2026): 6 Steps and the 3 Best Agents
Lesson answer for Illinois in 2026: if you want help with a registered agent, use Mainstay Filing ($149 a year), IL Registered Agent.org ($99 a year) and Illinois Registered Agent.co ($99 a year), in that order. After the picks, 6 steps explain the registered agent rule in plain words.
Prices from each company's own site, read November 12, 2026. State fees stay the same with any agent.
Step-by-step lesson
Step1
Step 1: Know the Illinois rule
Every LLC must name a registered agent with an in-state street address.
Official source: As listed on ilga.gov in October 2026
Step2
Step 2: Know who is allowed to act
An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent. Set by 805 ILCS 180/1-35.
Step3
Step 3: Use a qualifying 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.
TipUsing a service keeps your own address off the public record.
Step4
Step 4: Decide: yourself or a service
If you qualify under the rules above, you can be your own agent. Otherwise our picks charge $99 to $149 a year.
Step5
Step 5: Put the agent on record
Name the agent in the Articles of Organization (Form LLC-5.5); for an existing LLC, the change is filed with the Illinois Secretary of State.
Official source: As listed on ilsos.gov in October 2026
Step6
Step 6: Look after it each year
Each year, the Limited Liability Company Annual Report confirms your details for $75, by before the first day of the entity's anniversary month. Late filings cost $100.
Official source: As listed on ilsos.gov in October 2026
The cost of this lesson
Item
Who you pay
Cost
A professional agent
The service
$99 to $149 a year
Renewing the agent
The service
$99 to $149 a year
Limited Liability Company Annual Report
The state
$75 every year
The state rows are official figures; the service row uses each company's published price. The three-year total leaves service fees out.
Behind the ranking
The grade turned on lesson steps handled (35%), where Mainstay Filing came out ahead of IL Registered Agent.org.
IL Registered Agent.org costs less; coverage across states graded higher.
Quick answers
Do I need a registered agent in Illinois?
Yes. Every LLC must name a registered agent with an in-state street address.
Can I be my own registered agent?
Yes. Steps 2 and 3 set out who qualifies and the address you need.
Can I change my registered agent later?
Yes. An existing LLC files the change with the Illinois Secretary of State, as step 5 explains.
What does a registered agent cost in Illinois?
From $99 to $149 a year on this page.
What does the LLC pay the state each year?
The Limited Liability Company Annual Report, $75 every year.
Which registered agent would you choose?
Mainstay Filing, IL Registered Agent.org and Illinois Registered Agent.co, ranked in that order.