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Filing Verdict

Rankings of registered agents, LLC formation and foreign registration services in all 50 states.

Registered agent verdict · Illinois

3 Best Registered Agents in Illinois (2026)

Filing Verdict's 2026 verdict on registered agents in Illinois: Mainstay Filing ($149 a year), Illinois Registered Agent.co ($99 a year) and IL Registered Agent.org ($99 a year), in that order. Mainstay Filing takes first place: one $149 agent plan that follows the company into every state, renewing at $149.
The Filing Verdict editorial team
Top pick on this page
Spot 1

1. Mainstay Filing: best for all fifty states

$149 per year, flat

9.4Editorial score
out of 10

Mainstay Filing wins here: $149 a year whether the company stays put or expands, and the first three government mailings each year are scanned free.

New company? Mainstay's formation package at $199 a year adds the Illinois filing and the annual report.

The three-year bill is $150 higher than Illinois Registered Agent.co's, and the wider coverage is worth that to us.

What you get

  • A street address in the state, on the public record
  • Papers served on the company scanned and uploaded the same business day, free
  • The first three government mailings each year scanned free
  • Compliance reminders

What we like

  • Three government mailings a year scanned free
  • Serves LLCs, corporations, LPs, LLPs and nonprofits
  • $149 a year, unchanged at renewal
  • Same-business-day scans of served papers, free

Cons

  • The agent alone runs $50 a year above Illinois Registered Agent.co
  • Report filing is a formation-package feature, not part of the agent plan
Visit Mainstay FilingPartner link. We may earn money if you buy. Our full Mainstay Filing verdict
Best local option
Spot 2

2. Illinois Registered Agent.co: best for the lowest yearly fee on this list

$99 per year, flat

9.0Editorial score
out of 10

Second place goes to Illinois Registered Agent.co: $99 a year, flat, with served legal papers scanned and sent to you online.

With Illinois Registered Agent.co, the registered office address sits in the state, and anything served on the company is scanned and sent to you online.

What you get

  • A physical in-state address for the registered office
  • Scans of any served legal papers, available in your online account

What we like

  • $99 annually, flat at renewal
  • Forms LLCs too, first agent year included
  • Undercuts Mainstay Filing each year

Cons

  • The Limited Liability Company Annual Report filing is yours to handle
  • Built for Illinois; other states need a separate agent
Visit Illinois Registered Agent.coPartner link. We may earn money if you buy. Our full Illinois Registered Agent.co verdict
Local Illinois agent
Spot 3

3. IL Registered Agent.org: best for Illinois specialists

$99 per year, flat

8.8Editorial score
out of 10

Third place goes to IL Registered Agent.org: $99 a year, flat, with served legal papers scanned and sent to you online.

IL Registered Agent.org supplies the registered office street address and scans served legal papers into your account.

Illinois Registered Agent.co and IL Registered Agent.org publish identical prices and plan features, so little separates them; either is a safe pick.

What you get

  • An in-state street address on the public record
  • Served documents are scanned and uploaded for you to read online

What we like

  • $99 per year, renewing at the same price
  • Also forms LLCs, with year-one agent service included
  • Yearly price under Mainstay Filing's

Cons

  • The Limited Liability Company Annual Report filing is yours to handle
  • Built for Illinois; other states need a separate agent
Visit IL Registered Agent.orgPartner link. We may earn money if you buy. Our full IL Registered Agent.org verdict

The 3 verdicts at a glance

No.ServiceVerdict scoreYearly priceRenewalBest forVisit
1Mainstay Filing9.4$149$149/yrAn agent that works in all fifty states Visit Mainstay FilingPartner link. We may earn money if you buy.
2Illinois Registered Agent.co9.0$99$99/yrThe lowest yearly price we rank here Visit Illinois Registered Agent.coPartner link. We may earn money if you buy.
3IL Registered Agent.org8.8$99$99/yrThe lowest yearly price we rank here Visit IL Registered Agent.orgPartner link. We may earn money if you buy.
Every score here is Filing Verdict's own editorial mark out of 10, set from the criteria on How we rank. No customer ratings are involved.

Illinois registered agent prices for 2026: year one, renewals and three years

ServiceYear 1Year 2Year 3Total, 3 yearsRenewal price unchanged
Mainstay Filing$149$149$149$447Yes
Illinois Registered Agent.co$99$99$99$297Yes
IL Registered Agent.org$99$99$99$297Yes
Prices were read from each company's own pages on November 12, 2026. Illinois's fees do not depend on which agent you choose.

Why this order

The method behind this ranking weighs total over three years at 35% and paperwork the price handles at 35%, with renewal behavior, match to the state and up-front pricing sharing the remaining 30%. For Illinois, paperwork the price handles decided the order.

Mainstay's agent plan covers more: papers served on the company are scanned the same business day at no fee, one price applies in all fifty states and three government mailings a year are scanned free. Illinois Registered Agent.co costs less, and the two finish close.

The full list of criteria and weights is on How we rank.

Illinois registered agent requirements, from 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. Citation: 805 ILCS 180/1-35.

Illinois Limited Liability Company Annual Report: what it costs and when it is due

Every Illinois LLC owes the Limited Liability Company Annual Report every year. The state fee is $75, due before the first day of the entity's anniversary month. A late filing adds $100. Notices about it go to your registered agent.

Illinois registered agent: questions answered

Must an Illinois LLC have a registered agent?

Yes. Illinois requires every LLC to keep a registered agent on file, and the agent needs a street address in the state.

What do Illinois registered agents charge each year?

The prices run $99 to $149 a year, and every service keeps its price at renewal.

May I act as my own registered agent?

Only if you meet the state's conditions. An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent.

What is the due date for the Illinois Limited Liability Company Annual Report?

Due before the first day of the entity's anniversary month; the state fee is $75. Filing late adds $100.

Which registered agents are ranked on this page?

Mainstay Filing ($149 a year), Illinois Registered Agent.co ($99 a year) and IL Registered Agent.org ($99 a year), from first place to last.

Which registered agent is the best value in Illinois?

Mainstay Filing, because $149 a year, unchanged at renewal, with papers served on the company scanned the same business day at no charge.

More from us

Sources and dates

  1. Illinois Secretary of State, Department of Business Services, Limited Liability Division, confirmed August 2026
  2. Illinois Secretary of State, Department of Business Services, Limited Liability Division, confirmed August 2026
  3. 805 ILCS 180/5-5, confirmed August 2026
  4. Illinois formation fee: Filing fee, official source, confirmed October 2026
  5. Illinois formation fee: Filing fee, official source, confirmed October 2026
  6. Illinois registered agent statute, confirmed October 2026
  7. Checked November 12, 2026: Mainstay Filing, Illinois service page
  8. Checked November 12, 2026: Illinois Registered Agent.co, pricing and service pages
  9. Checked November 12, 2026: IL Registered Agent.org, pricing and service pages