An Illinois LLC must continuously maintain a registered agent and registered office in Illinois. The agent can be an Illinois resident who is at least 18 or a business entity authorized to operate in Illinois, but not the LLC itself, and the registered office must match the agent’s business office (a P.O. box alone is not accepted). To change agents, file a Statement of Change of Registered Agent and/or Registered Office (LLC-1.36/1.37), which costs $25 with the Illinois Secretary of State as of October 2026.
That fee is modest, but Illinois also penalizes LLCs that let their records lapse. Our recommendation for most owners is Mainstay Filing at $149 a year; the rules, costs and filing steps follow.
Updated October 2026.
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Best Registered Agents in Illinois (2026)
Our ranked picks for registered agent service in Illinois are below, starting with Mainstay Filing. Each entry lists the yearly price and what the service covers.
| Rank | Provider | Best for | Price | What’s included |
|---|---|---|---|---|
| 1 | Mainstay Filing | Registered agent service with a flat renewal price | $149/year (renews at $149) | Registered agent service in all 50 states; switching from another agent included (state change fee at cost) |
| 2 | IL Registered Agent.org | Illinois registered agent service only | $99/year | $99 per year, flat; in-state street address for the registered office; legal documents served on the company are scanned and sent to the owner online |
| 3 | Illinois Registered Agent.co | Illinois registered agent service only | $99/year | in-state street address for the registered office; legal documents served on the company are scanned and sent to the owner online |
1. Mainstay Filing
Mainstay Filing is our top pick in Illinois. It costs $149/year (renews at $149) and covers registered agent service in all 50 states; switching from another agent included (state change fee at cost). The price stays the same every year, with no add-on menu.
2. IL Registered Agent.org
IL Registered Agent.org is a Illinois registered agent service at $99/year. It provides $99 per year, flat; in-state street address for the registered office; legal documents served on the company are scanned and sent to the owner online. It’s a fit if you only need a registered agent rather than full formation help.
3. Illinois Registered Agent.co
Illinois Registered Agent.co is a Illinois registered agent service at $99/year. It provides in-state street address for the registered office; legal documents served on the company are scanned and sent to the owner online. It’s a fit if you only need a registered agent rather than full formation help.
Illinois registered agent: key numbers and rules
| Topic | Illinois (October 2026) |
|---|---|
| Who can serve | An Illinois resident aged 18+, or a business entity authorized in Illinois |
| Can the LLC be its own agent? | No |
| Office rule | Registered office must be identical to the agent’s business office; P.O. box alone unacceptable |
| Change of agent (LLC-1.36/1.37) | $25, plus $50 optional expedite (SOS LLC forms) |
| Agent resignation (LLC-1.35) | $5 |
| Articles of Organization (LLC-5.5) | $150 ($400 for a series LLC) |
| LLC annual report | $75, due before the first day of the anniversary month |
| Late annual report | $100 penalty; administrative dissolution after 180 days delinquent |
What does an Illinois registered agent do?
The registered agent accepts service of process, the formal delivery of lawsuits and subpoenas, for your LLC. It also receives official notices from the Secretary of State. The agent’s name and the registered office address appear in the state’s public business records. Foreign LLCs registered to do business in Illinois need an Illinois agent too, under the same rules, so the role matters whether your company was formed in Illinois or in another state.
In Illinois the agent must be present at the registered office during normal business hours, which is what makes service reliable. If nobody is there when a process server arrives, the case does not simply stop; you risk learning about it late, after deadlines have started to run.
Illinois registered agent requirements
The rule is in the Illinois Limited Liability Company Act at 805 ILCS 180/1-35. In plain terms:
- Eligible agents. An individual Illinois resident who is at least 18, or another business entity authorized to transact business in Illinois and registered with the Secretary of State.
- No self-appointment. The LLC cannot act as its own registered agent. A member or manager can serve personally if they qualify as an individual.
- Matching addresses. The registered office address must be identical to the agent’s business office address.
- No P.O. box alone. A post office box by itself is unacceptable; the office needs a street address.
- Continuous maintenance. Under 805 ILCS 180/1-36, the LLC must change its agent if the office becomes vacant or the agent becomes disqualified or unable to act.
What it costs to change your Illinois registered agent
The Illinois Secretary of State charges $25 for LLC-1.36/1.37, the Statement of Change of Registered Agent and/or Registered Office, according to its LLC publications and forms page. Expedited handling costs an extra $50.
| Form | Purpose | Fee | Expedite |
|---|---|---|---|
| LLC-1.36/1.37 | Change registered agent and/or registered office | $25 | +$50 |
| LLC-1.35 | Resignation of registered agent | $5 | +$50 |
| LLC-5.5 | Articles of Organization | $150 | +$100 |
The paper form is submitted in duplicate. It also notes that a penalty can apply in some cases, so file promptly when your agent changes rather than waiting for the annual report.
Steps to change your registered agent in Illinois
- Pick an eligible agent and confirm the exact Illinois street address of its business office.
- File online through the Secretary of State’s LLC change of registered agent service, or complete LLC-1.36/1.37 on paper in duplicate.
- Enter the LLC’s file number and the agent and office currently on record, then the new agent and address.
- Sign the attestation as a manager or member with authority, under penalties of perjury.
- Pay $25, plus $50 if you need expedited handling.
- Check the record and notify your former agent.
Can you serve as your own registered agent in Illinois?
You personally can, if you are an Illinois resident aged 18 or older with a street address where you are present during business hours. Your LLC as an entity cannot. Before naming yourself, weigh these points:
Upsides
- No annual fee for agent service.
- Documents come straight to you.
Downsides
- Your address goes into the public business record, where anyone can look it up.
- You must be reachable at that address during business hours, which is hard for owners who work on the road or from multiple locations.
- Every move costs another $25 filing.
- Owners living in Indiana, Wisconsin, Missouri or elsewhere outside Illinois are not eligible.
Chicago-area owners who commute in from out of state are a common example: they run an Illinois LLC but cannot serve as its agent themselves.
Questions to ask a commercial agent
- Is your Illinois office a staffed street address that matches what you will list as our registered office?
- How will I see documents served on my company, and how quickly are they posted to my account?
- What does the service cost at renewal, not just in the first year?
- Will you file the LLC-1.36/1.37 change for me, and is the $25 state fee passed through at cost?
Illinois annual report and other next steps
Illinois LLCs file an annual report for $75 before the first day of their anniversary month, according to the Secretary of State’s annual report instructions. A late report draws a $100 penalty, and administrative dissolution can begin after 180 days of delinquency. Online filing through the LLC annual report service is available to LLCs with eight or fewer members.
For more Illinois help, see our guides to forming an LLC in Illinois and starting a business in Illinois, and check whether your preferred name is free with the Illinois business name search guide.
FAQs
How much does it cost to change a registered agent in Illinois?
The Illinois Secretary of State charges $25 for LLC-1.36/1.37, the Statement of Change of Registered Agent and/or Registered Office, as of October 2026. Expedited handling adds $50, and the change can also be filed online. A registered agent who resigns files LLC-1.35, which costs $5.
Who can be a registered agent in Illinois?
Under 805 ILCS 180/1-35, an Illinois LLC’s agent can be an Illinois resident who is at least 18 or a business entity authorized to transact business in Illinois. The registered office must match the agent’s business office, and a P.O. box alone is not acceptable.
Can my Illinois LLC be its own registered agent?
No. The Secretary of State’s forms state that the LLC may not act as its own registered agent. A member or manager can serve personally if they are an Illinois resident aged 18 or older with a qualifying street address, or the LLC can hire a commercial agent.
Can I change my Illinois registered agent online?
Yes. The Illinois Secretary of State offers an online service for changing an LLC’s registered agent and agent’s office address. The filer attests under penalties of perjury to having authority. The paper alternative is LLC-1.36/1.37, submitted in duplicate with the $25 fee.
When is the Illinois LLC annual report due?
The annual report is due before the first day of the LLC’s anniversary month each year, and the fee is $75. A late report triggers a $100 penalty, and administrative dissolution can begin after 180 days of delinquency. LLCs with eight or fewer members can file online.
Does an Illinois registered agent need to be available during business hours?
Yes. The agent should be present at the registered office during normal business hours so that legal papers can be served. That is the main reason owners who travel or work from several locations often hire a commercial registered agent instead of serving themselves.
What is the best registered agent in Illinois?
Our recommendation is Mainstay Filing at $149 per year with the same renewal price and the agent switch included. IL Registered Agent.org is an alternative at a flat $99 per year that provides an in-state street address and online access to scanned documents.
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