Registered agent ratings · Illinois
3 Best Registered Agents in Illinois (2026)
1. IL Registered Agent.org: best for the lowest yearly amount on this list
$99 a year, level on renewal
IL Registered Agent.org is rated first: an Illinois specialist at $99 a year, providing an in-state registered office street address.
IL Registered Agent.org supplies the state street address for the registered office and posts scans of served papers to your account.
Across three years it costs less than Mainstay Filing, and cost carries heavy weight in the rating.
What you get
- A street address in the state for the registered office
- Legal papers served on the company reach you as online scans
Pros
- Yearly amount $99, unchanged when it renews
- LLC formation offered, with year-one agent service
- Comes in under Mainstay Filing each year
Trade-offs
- The Limited Liability Company Annual Report remains your own filing
- Illinois only; other states need another agent
2. Illinois Registered Agent.co: best for businesses in Illinois
$99 a year, level on renewal
Illinois Registered Agent.co is rated second: an Illinois specialist at $99 a year, providing an in-state registered office street address.
The registered office is an in-state street address from Illinois Registered Agent.co; anything served on the company is scanned for your account.
IL Registered Agent.org and Illinois Registered Agent.co list identical amounts and plan features, so the ratings are close and either is a fair pick.
What you get
- A street address in the state for the registered office
- Legal papers served on the company reach you as online scans
Pros
- $99 annually, no renewal increase
- A lower yearly amount than Mainstay Filing
- Forms LLCs as well, first agent year included
Trade-offs
- The Limited Liability Company Annual Report remains your own filing
- Illinois only; other states need another agent
3. Mainstay Filing: best for any state
$149 a year, level on renewal
Mainstay Filing is rated third: $149 for a plan that applies in every state, $149 on renewal.
Company not formed yet? Mainstay's $199-a-year package puts the Illinois filing and the annual report on one line.
IL Registered Agent.org is $150 cheaper on the three-year sum, and that lowers Mainstay Filing's cost rating.
What you get
- A physical in-state address as the registered office
- Same-business-day scan and upload for any service of process, no fee
- Three government mailings a year scanned free
- Compliance reminders
Pros
- $149 a year, level on renewal
- Government mail scanned free, first three pieces a year
- Accepts LLCs, corporations, LPs, LLPs and nonprofits
- Same-business-day scans of service of process, no fee
Trade-offs
- Agent alone is $50 a year above IL Registered Agent.org
- On the agent plan you file your own annual report
The 3 ratings summarized
| Line | Service | Rating | Yearly amount | Renewal amount | Best for | Open |
|---|---|---|---|---|---|---|
| 1 | IL Registered Agent.org | 9.3 | $99 | $99/yr | The lowest yearly price we rank here | Visit IL Registered Agent.orgPartner link. We may earn money if you buy. |
| 2 | Illinois Registered Agent.co | 9.1 | $99 | $99/yr | The lowest yearly price we rank here | Visit Illinois Registered Agent.coPartner link. We may earn money if you buy. |
| 3 | Mainstay Filing | 9.0 | $149 | $149/yr | A single agent in any state | Visit Mainstay FilingPartner link. We may earn money if you buy. |
Illinois registered agent amounts for 2026: year one, renewal and three-year sum
| Service | Year one | Year two | Year three | Three-year sum | Same amount on renewal |
|---|---|---|---|---|---|
| IL Registered Agent.org | $99 | $99 | $99 | $297 | Yes |
| Illinois Registered Agent.co | $99 | $99 | $99 | $297 | Yes |
| Mainstay Filing | $149 | $149 | $149 | $447 | Yes |
Why the order looks like this
Weights: 27% cost over years one to three, 27% inclusions per price, 46% shared by renewal price and terms, fit with state rules and price clarity. Cost over years one to three decided Illinois.
IL Registered Agent.org sums to $297 across three years, $150 below Mainstay Filing. For a company that needs an agent in Illinois only, fifty-state coverage adds little, so the lower yearly amount decided the rating.
Each criterion and its weight is listed on How we rank.
Illinois registered agent requirements per Illinois Secretary of State (official)
Every LLC must name a registered agent with an in-state street 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. Authority cited: 805 ILCS 180/1-35.
The Illinois Limited Liability Company Annual Report: amount, date and agent
Illinois LLCs owe the Limited Liability Company Annual Report every year, due before the first day of the entity's anniversary month. Amount: $75. Late filing adds $100. The state sends notices about it to your registered agent.
Illinois registered agent: your questions
Does an Illinois LLC need to appoint a registered agent?
It does. Illinois treats a registered agent as a standing requirement, and the agent needs a street address within the state.
What is the yearly price of a registered agent in Illinois?
Yearly amounts run $99 to $149, and each holds on renewal.
Is it permitted to be your own registered agent?
Yes, when the state's conditions are met. An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent.
On what date is the Illinois Limited Liability Company Annual Report due?
Due before the first day of the entity's anniversary month. Fee: $75. Late penalty: $100.
Which registered agents are rated on this page?
IL Registered Agent.org ($99 a year), Illinois Registered Agent.co ($99 a year) and Mainstay Filing ($149 a year), highest rated first.
Which Illinois registered agent has the best value rating?
IL Registered Agent.org, as $99 a year, flat, with online scans of legal papers served.
Source lines
- Illinois Secretary of State, Department of Business Services, Limited Liability Division (ledger date August 2026)
- Illinois Secretary of State, Department of Business Services, Limited Liability Division (ledger date August 2026)
- 805 ILCS 180/5-5 (ledger date August 2026)
- Illinois formation fee: Filing fee, official source (ledger date October 2026)
- Illinois formation fee: Filing fee, official source (ledger date October 2026)
- Illinois registered agent statute (ledger date October 2026)
- IL Registered Agent.org, pricing and service pages: amounts read November 12, 2026
- Illinois Registered Agent.co, pricing and service pages: amounts read November 12, 2026
- Mainstay Filing, Illinois service page: amounts read November 12, 2026