Place1
Our top pick in IllinoisMainstay Filing
1. Mainstay Filing: best for growing companies
$149 a year, same at renewal
Our mark9.1out of 10
Mainstay Filing is number one here: one $149 agent price here and in every other state, renewing at $149.
For a new company, the $199-a-year package covers formation and the annual report too.
Over three years it costs $150 more than Illinois Registered Agent.co, and we think the extra coverage earns that here.
What you get
- A physical in-state address on the public record
- Service of process scanned the same business day, no fee
- First three government mailings a year scanned free
- Compliance reminders
Why pick it
- Works for LLCs, corporations, LPs, LLPs and nonprofits
- Flat $149 a year
- Service of process scanned the same business day, no fee
- First three government mailings a year scanned free
Less good
- Pricier than Illinois Registered Agent.co by $50 a year
- Agent-only plan: reports are not filed for you
Place2
Best for an Illinois-only companyIllinois Registered Agent.co
2. Illinois Registered Agent.co: best for price-first founders
$99 a year, same at renewal
Our mark8.6out of 10
Illinois Registered Agent.co ranks second: $99 a year with the same price at renewal, the lowest yearly price on this list.
The plan covers an in-state street address for your registered office, with legal documents scanned and sent to you online.
What you get
- In-state street address for the registered office
- Legal documents served on the company scanned and sent to you online
Why pick it
- Can form your LLC as well
- Lowest annual price on this list
- $99 yearly, same to renew
Less good
- No Limited Liability Company Annual Report filing
- Illinois only
Place3
Illinois-focusedIL Registered Agent.org
3. IL Registered Agent.org: best for an Illinois specialist
$99 a year, same at renewal
Our mark8.4out of 10
IL Registered Agent.org ranks third: $99 a year with the same price at renewal, the lowest yearly price on this list.
The plan covers an in-state street address for your registered office, with legal documents scanned and sent to you online.
Illinois Registered Agent.co and IL Registered Agent.org publish the same prices and the same plan features, so the gap between them is small and either is a sound choice.
What you get
- In-state street address for the registered office
- Legal documents served on the company scanned and sent to you online
Why pick it
- $99 yearly, same to renew
- Lowest annual price on this list
- Can form your LLC as well
Less good
- No Limited Liability Company Annual Report filing
- Illinois only
3 picks compared
| Rank | Service | Our score | Annual price | Renewal price | Best for | Link |
|---|
| 1 | Mainstay Filing | 9.1 | $149 | $149/yr | Agent plus fifty-state coverage | Visit Mainstay FilingPartner link. We may earn money if you buy. |
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| 2 | Illinois Registered Agent.co | 8.6 | $99 | $99/yr | Lowest yearly price on this list | Visit Illinois Registered Agent.coPartner link. We may earn money if you buy. |
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| 3 | IL Registered Agent.org | 8.4 | $99 | $99/yr | Lowest yearly price on this list | Visit IL Registered Agent.orgPartner link. We may earn money if you buy. |
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The Founders Review sets these scores itself from the five criteria on our method page; they are not user ratings.
Annual and renewal prices in Illinois, 2026
| Service | Year one | Year two | Year three | Three-year total | Same price at renewal |
|---|
| Mainstay Filing | $149 | $149 | $149 | $447 | Yes |
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| Illinois Registered Agent.co | $99 | $99 | $99 | $297 | Yes |
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| IL Registered Agent.org | $99 | $99 | $99 | $297 | Yes |
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Read from each provider's pricing page on November 12, 2026. Illinois charges the same state fees whichever service you pick.
Why this order
The Founders Review weighs five things, led by three-year cost and what one price covers at 30% each. For Illinois, what one price covers is what separated first place from second.
Coverage tipped it: Mainstay works in every state at one price, while Illinois Registered Agent.co wins only on cost.
See How we rank for every criterion and weight.
Illinois registered agent requirements (official, Illinois Secretary of State)
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. The rule is in 805 ILCS 180/1-35.
Your Limited Liability Company Annual Report in Illinois
$75 every year, due before the first day of the entity's anniversary month: that is the Limited Liability Company Annual Report. The late fee is $100. The state writes to your registered agent about it.
What Illinois founders ask
Does an Illinois LLC need a registered agent?
Yes. Every LLC must name a registered agent with an in-state street address.
How much does a registered agent cost in Illinois?
From $99 to $149 a year, the same at renewal.
Can I be my own registered agent?
Only when you meet the conditions. An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent.
When is the Illinois Limited Liability Company Annual Report due?
It is due before the first day of the entity's anniversary month and the state fee is $75. Late filings cost $100 more.
Which registered agents do you rank here?
Mainstay Filing ($149 a year), Illinois Registered Agent.co ($99 a year) and IL Registered Agent.org ($99 a year), ranked in that order.
Which Illinois registered agent is the best value?
On our method, Mainstay Filing: $149 a year for an agent that can follow the company into any state at the same price.
Sources
- Illinois Secretary of State, Department of Business Services, Limited Liability Division: www.ilsos.gov/departments/business-services/annual-reports/llc-instruc, checked August 2026
- Illinois Secretary of State, Department of Business Services, Limited Liability Division: www.ilsos.gov/departments/business-services/annual-reports.html, checked August 2026
- 805 ILCS 180/5-5: www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=080501800K5-5, checked August 2026
- Illinois formation fee: Filing fee, official source: www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=080501800K50-10, checked October 2026
- Illinois formation fee: Filing fee, official source: www.ilsos.gov/publications/business-services/llc.html, checked October 2026
- Illinois registered agent statute: www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=080501800K1-35, checked October 2026
- Illinois service page of Mainstay Filing, read November 12, 2026
- Pricing and service pages of Illinois Registered Agent.co, read November 12, 2026
- Pricing and service pages of IL Registered Agent.org, read November 12, 2026