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The Formation Desk

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

Registered agent picks · Connecticut

3 Best Registered Agents in Connecticut (2026)

The The Formation Desk call for registered agents in Connecticut in 2026: Mainstay Filing ($149 a year), Connecticut Registered Agent.co ($99 a year) and CT Registered Agent.org ($99 a year), in that order. Mainstay Filing takes the call: $149 for a single agent plan that works in every state, $149 on renewal.
Written by The Formation Desk editorial team
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Our top pick

1. Mainstay Filing: best for every state

$149 a year, and it holds on renewal

Editorial score 9.6 out of 10

The desk picks Mainstay Filing: $149 a year for an agent that goes wherever the company does, plus the first three government mailings each year scanned free.

Haven't formed yet? Mainstay's $199-a-year package handles the Connecticut filing and the annual report.

Over three years Mainstay runs $150 more than Connecticut Registered Agent.co, and the desk thinks the wider coverage is worth it.

In the price

  • An in-state street address on the public record
  • Scanned service of process delivered the same business day at no cost
  • Your first three government mailings each year, scanned free
  • Compliance reminders

Strengths

  • Free scans of served papers on the same business day
  • First three government mailings each year, scanned free
  • Works for LLCs, corporations, LPs, LLPs and nonprofits alike
  • $149 a year and it holds on renewal

Cons

  • $50 a year more than Connecticut Registered Agent.co for agent service alone
  • Only the formation package files annual reports
Visit Mainstay FilingPartner link. We may earn money if you buy. Mainstay Filing up close
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Best for a Connecticut-only company

2. Connecticut Registered Agent.co: best for the lowest price per year on this list

$99 a year, and it holds on renewal

Editorial score 9.2 out of 10

Runner-up, Connecticut Registered Agent.co: a Connecticut specialist at $99 a year, with an in-state street address as the registered office.

Connecticut Registered Agent.co puts an in-state street address on file for the company and scans served legal papers into your account.

In the price

  • A registered office address inside the state
  • Papers served on the company arrive in your account as scans

Strengths

  • Yearly price below Mainstay Filing's
  • $99 a year and it holds on renewal
  • Also forms LLCs and includes the first agent year

Cons

  • The annual report is your job
  • Connecticut only; you need another agent elsewhere
Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy. Connecticut Registered Agent.co up close
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Local Connecticut agent

3. CT Registered Agent.org: best for Connecticut companies

$99 a year, and it holds on renewal

Editorial score 8.9 out of 10

Third, CT Registered Agent.org: a Connecticut specialist at $99 a year, with an in-state street address as the registered office.

CT Registered Agent.org puts an in-state street address on file for the company and scans served legal papers into your account.

The published prices and features do not separate Connecticut Registered Agent.co from CT Registered Agent.org; take whichever you like.

In the price

  • An in-state street address for the registered office
  • Everything served on the company is scanned for you

Strengths

  • Also forms LLCs and includes the first agent year
  • Yearly price below Mainstay Filing's
  • Costs $99 a year, the same each year

Cons

  • The annual report is your job
  • Connecticut only; you need another agent elsewhere
Visit CT Registered Agent.orgPartner link. We may earn money if you buy. CT Registered Agent.org up close

The desk's 3 picks in brief

Pick Service Desk score Price a year Renewal Good for Visit
1 Mainstay Filing 9.6 $149 $149/yr One agent that covers every state Visit Mainstay FilingPartner link. We may earn money if you buy.
2 Connecticut Registered Agent.co 9.2 $99 $99/yr The lowest yearly price we rank here Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy.
3 CT Registered Agent.org 8.9 $99 $99/yr The lowest yearly price we rank here Visit CT Registered Agent.orgPartner link. We may earn money if you buy.

A score out of 10 here is editorial judgment built on the criteria explained on How we rank, not an average of customer ratings.

What a Connecticut registered agent costs in 2026: year one, renewal and the three-year bill

Service Year one Year two Year three Bill over three years Price holds on renewal
Mainstay Filing $149 $149 $149 $447 Yes
Connecticut Registered Agent.co $99 $99 $99 $297 Yes
CT Registered Agent.org $99 $99 $99 $297 Yes

Every price here was read off the company's own pages on November 12, 2026. Connecticut charges the same state fees whichever agent you name.

Why it falls this way

Here is the weighting: 33% for spend over three years, 33% for work the price removes, 34% spread over what renewal looks like, fit with the state and plain price display. In Connecticut, work the price removes made the call.

Mainstay's agent plan brings more to the table: served papers are scanned the same business day for nothing, one price in all fifty states and three government mailings a year scanned free. Connecticut Registered Agent.co is cheaper, and it was close.

The full criteria and weights are on How we rank.

Connecticut registered agent rules straight from Connecticut Secretary of State (official)

Every LLC must name a registered agent with an in-state street address. The address has to be a Connecticut street address that is not a P.O. box, plus a Connecticut mailing address, which can be a P.O. box. The law behind it: Conn. Gen. Stat. § 34-243n.

Connecticut's annual report: what it costs, when it is due, who gets the notice

Connecticut LLCs send in the annual report every year, due on or before March 31. The state's fee is $80. Notices about it land with your registered agent.

Connecticut registered agent: reader questions

Do you need a registered agent to run a Connecticut LLC?

You do. Connecticut wants a registered agent on file for every LLC, and the agent must have a street address in the state.

What should you expect to pay a Connecticut registered agent?

Plan on $99 to $149 a year, and the price holds when it renews.

Could you serve as your own registered agent?

You can if the state's rules allow it. A Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment.

When does the Connecticut annual report have to go in?

Get it in by on or before March 31. The state's cut is $80.

Which registered agents did the desk rank here?

Mainstay Filing ($149 a year), Connecticut Registered Agent.co ($99 a year) and CT Registered Agent.org ($99 a year), best pick first.

Who is our pick for registered agent in Connecticut?

Mainstay Filing, since $149 a year, and it holds on renewal, with papers served on the company scanned the same business day for free.

Keep reading

Where the numbers came from

  1. Connecticut Secretary of the State, Business Services Division, last checked August 2026
  2. Connecticut Secretary of the State, Business Services Division, last checked August 2026
  3. Connecticut yearly filing: Annual report: fee, official source, last checked October 2026
  4. Connecticut report due date, last checked August 2026
  5. Connecticut formation fee: Filing fee, official source, last checked October 2026
  6. Connecticut formation fee: Filing fee, official source, last checked October 2026
  7. Mainstay Filing: Connecticut service page, as of November 12, 2026
  8. Connecticut Registered Agent.co: pricing and service pages, as of November 12, 2026
  9. CT Registered Agent.org: pricing and service pages, as of November 12, 2026