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Biz Formation Report

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

Registered agents report · Connecticut

3 Best Registered Agents in Connecticut (2026)

By the Biz Formation Report editorial team

Biz Formation Report ranks registered agents in Connecticut for 2026 as Mainstay Filing ($149 a year), CT Registered Agent.org ($99 a year) and Connecticut Registered Agent.co ($99 a year), in that order. Mainstay Filing earns the top grade: $149 a year, flat at renewal, with papers served on the company scanned the same business day at no charge.

No.1

Top pick on this page

1. Mainstay Filing: best for all fifty states

Score9.5out of 10
$149 a year, unchanged at renewal

Top grade, Mainstay Filing: a $149 yearly plan that works in every state, renewing at $149.

A company still to be formed can use Mainstay's $199-a-year package, which files the Connecticut paperwork and the annual report.

Over three years Mainstay costs $150 more than CT Registered Agent.org; our grading treats the broader coverage as worth that.

What you get

  • A physical address in the state on the public record
  • Same-business-day scanning of legal papers served, no fee
  • Scans of the first three government mailings each year, free
  • Compliance reminders

Good

  • Open to LLCs, corporations, LPs, LLPs and nonprofits
  • $149 a year, no renewal increase
  • Three government mailings a year scanned at no cost
  • Served papers scanned within the same business day, free

Weak spots

  • The agent alone costs $50 a year more than CT Registered Agent.org
  • You file annual reports yourself on the agent plan
Visit Mainstay FilingPartner link. We may earn money if you buy.
Read the Mainstay Filing review
No.2

Best yearly price

2. CT Registered Agent.org: best for the lowest annual price on this list

Score9.1out of 10
$99 a year, unchanged at renewal

Second grade, CT Registered Agent.org: $99 a year flat, with online scans of any legal papers served.

Served legal papers go to the in-state address CT Registered Agent.org provides, and you receive scans of them online.

What you get

  • An in-state street address as the registered office
  • Papers served on the company are scanned and delivered to your account

Good

  • Costs less per year than Mainstay Filing
  • Also forms LLCs and includes the first agent year
  • A flat $99 per year

Weak spots

  • The annual report filing is left to you
  • Serves Connecticut only; other states need a separate agent
Visit CT Registered Agent.orgPartner link. We may earn money if you buy.
Read the CT Registered Agent.org review
No.3

Connecticut only

3. Connecticut Registered Agent.co: best for companies based in Connecticut

Score8.8out of 10
$99 a year, unchanged at renewal

Third grade, Connecticut Registered Agent.co: $99 a year flat, with online scans of any legal papers served.

Served legal papers go to the in-state address Connecticut Registered Agent.co provides, and you receive scans of them online.

Prices and features do not separate CT Registered Agent.org from Connecticut Registered Agent.co; either works.

What you get

  • The state street address required for the registered office
  • Every legal paper served is scanned for you to read online

Good

  • Costs less per year than Mainstay Filing
  • Also forms LLCs and includes the first agent year
  • $99 a year, unchanged at renewal

Weak spots

  • The annual report filing is left to you
  • Serves Connecticut only; other states need a separate agent
Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy.
Read the Connecticut Registered Agent.co review

Summary of the 3 grades

RankProviderGradePrice per yearRenewal priceBest fitSite
1Mainstay Filing9.5$149$149/yrOne agent across fifty statesVisit Mainstay FilingPartner link. We may earn money if you buy.
2CT Registered Agent.org9.1$99$99/yrThe lowest yearly price we rank hereVisit CT Registered Agent.orgPartner link. We may earn money if you buy.
3Connecticut Registered Agent.co8.8$99$99/yrThe lowest yearly price we rank hereVisit Connecticut Registered Agent.coPartner link. We may earn money if you buy.

The grades are editorial: Biz Formation Report assigns every mark out of 10 using the criteria on How we rank, not customer ratings.

Connecticut registered agent prices, 2026: year one, renewal and three-year outlay

ProviderYear 1Year 2Year 3Three-year outlayRenewal at the same price
Mainstay Filing$149$149$149$447Yes
CT Registered Agent.org$99$99$99$297Yes
Connecticut Registered Agent.co$99$99$99$297Yes

All prices were taken from the companies' own websites on November 12, 2026. Connecticut's own fees are the same whichever agent is named.

How the grades were set

Of the grade, 32% rests on three-year bill and 32% on what the money buys; renewal handling, local rules match and pricing openness share the remaining 36%. What the money buys decided Connecticut.

Mainstay's agent plan grades higher on coverage: served papers are scanned the same business day at no fee, the price is identical in all fifty states and three government mailings a year are scanned free. CT Registered Agent.org wins on cost, and the margin is thin.

Every criterion and weight is listed on How we rank.

Connecticut registered agent rules according to 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. Authority: Conn. Gen. Stat. § 34-243n.

Connecticut's annual report: cost, deadline and your agent

The annual report is due from every Connecticut LLC every year, by on or before March 31. The state charges $80. Related notices are mailed to your registered agent.

Connecticut registered agent: common questions

Does a Connecticut LLC have to maintain a registered agent?

Yes. The state expects every LLC to keep a registered agent on record, and Connecticut requires that agent to have a street address inside its borders.

How much do Connecticut registered agents charge per year?

Annual charges run from $99 to $149, and prices are unchanged at renewal.

Can the owner be the company's own registered agent?

Yes, provided you meet the state's requirements. A Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment.

What is the filing deadline for the Connecticut annual report?

The deadline: on or before March 31. The state charges $80.

Which registered agents does this report rank?

Mainstay Filing ($149 a year), CT Registered Agent.org ($99 a year) and Connecticut Registered Agent.co ($99 a year), in descending order of grade.

What is the best-value registered agent in Connecticut?

Mainstay Filing: $149 per year for an agent that goes wherever the company goes, plus free scans of the first three government mailings each year.

Keep reading

Source notes

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