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Biz Formation Report

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

LLC formation report · Connecticut

3 Best LLC Services in Connecticut (2026)

By the Biz Formation Report editorial team

Biz Formation Report ranks LLC services in Connecticut for 2026 as Connecticut Registered Agent.co ($199), CT Registered Agent.org ($199) and Mainstay Filing ($199), in that order. Connecticut Registered Agent.co earns the top grade: forming in Connecticut costs $199 beyond the state's fee, with the first agent year included, and keeping the agent runs $99 a year.

No.1

Our top pick in Connecticut

1. Connecticut Registered Agent.co: best for a Connecticut LLC that expects to stay put

Score9.5out of 10
$199 for formation, then $99 a year for the agent, plus the state fee

Top grade, Connecticut Registered Agent.co: $199 for formation on top of the state fee, then $99 a year for the agent.

The plan seats the company at an in-state street address and posts scans of papers served there to your online account.

The annual report is outside its published prices, so you submit it to Connecticut yourself every year.

Over three years it costs less than Mainstay Filing, and cost is one of our two heaviest criteria.

What you get

  • The formation filing
  • Year-one registered agent service

Good

  • $199 for formation, plus the state fee
  • The first year as your registered agent is included
  • $99 a year for the agent from year two

Weak spots

  • Does not handle the annual report
  • The EIN application costs $99 extra
Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy.
Read the Connecticut Registered Agent.co review
No.2

Lower renewal than Mainstay

2. CT Registered Agent.org: best for local Connecticut formation

Score9.1out of 10
$199 for formation, then $99 a year for the agent, plus the state fee

Second grade, CT Registered Agent.org: $199 for formation on top of the state fee, then $99 a year for the agent.

The plan seats the company at an in-state street address and posts scans of papers served there to your online account.

The annual report is outside its published prices, so you submit it to Connecticut yourself every year.

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

What you get

  • The formation filing
  • Year-one registered agent service

Good

  • The first year as your registered agent is included
  • Agent renewal of $99
  • $199 service fee, state fee added

Weak spots

  • Does not handle the annual report
  • The EIN application costs $99 extra
Visit CT Registered Agent.orgPartner link. We may earn money if you buy.
Read the CT Registered Agent.org review
No.3

Formation, agent and report

3. Mainstay Filing: best for formation, agent and annual report on one invoice

Score8.8out of 10
$199 a year plus the state fee, $319 due at checkout

Third grade, Mainstay Filing: the formation filing, the registered agent and the annual report come to $199 a year, renewing at $199.

The renewal covers the annual report, which Mainstay files for you. Connecticut collects $80 every year, with a deadline of on or before March 31; Mainstay passes the state's fee through at cost.

Connecticut Registered Agent.co is $200 cheaper across three years, and that difference lowers Mainstay Filing's cost grade.

What you get

  • The LLC formation, done for you
  • Registered agent service all year
  • The annual report prepared and filed
  • The EIN application

Good

  • Renewal is $199 with no add-ons
  • Includes the EIN application
  • Connecticut's state fee is passed through at cost
  • A single $199 yearly price, including the annual report

Weak spots

  • Its agent renews at $100 a year more than Connecticut Registered Agent.co's
Visit Mainstay FilingPartner link. We may earn money if you buy.
Read the Mainstay Filing review

Summary of the 3 grades

RankProviderGradeService feeYear twoBest fitSite
1Connecticut Registered Agent.co9.5$199$99/yrA Connecticut-only LLC keeping costs downVisit Connecticut Registered Agent.coPartner link. We may earn money if you buy.
2CT Registered Agent.org9.1$199$99/yrA Connecticut-only LLC keeping costs downVisit CT Registered Agent.orgPartner link. We may earn money if you buy.
3Mainstay Filing8.8$199$199/yrFormation, agent and annual report on one invoiceVisit Mainstay FilingPartner 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 LLC service prices, 2026: year one, renewal and three-year outlay

ProviderYear 1Year 2Year 3Three-year outlayAnnual report done for you
Connecticut Registered Agent.co$199$99$99$397No
CT Registered Agent.org$199$99$99$397No
Mainstay Filing$199$199$199$597Yes

All prices were taken from the companies' own websites on November 12, 2026. Connecticut's $120 filing fee is payable on top of each row and is not part of these totals.

The basis for the order

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%. Three-year bill decided Connecticut.

Total outlay with Connecticut Registered Agent.co over three years: $397, $200 less than Mainstay Filing. Mainstay would add the annual report filing, but owners can file it alone for the state fee, so the lower price decided the grade.

Every criterion and weight is listed on How we rank.

Connecticut LLC filing fee and form, from official sources

The Connecticut Secretary of State charges $120 for the Certificate of Organization. Each provider here adds that fee at cost on top of its own.

Processing time at the state: Most online filings automatically accepted.

What a Connecticut LLC owes after formation

Expect the annual report every year, with a deadline of on or before March 31. It costs $80. Every LLC must name a registered agent with an in-state street address.

Connecticut LLC service: common questions

What does Connecticut charge to start an LLC, all in?

$120 goes to the state and $199 to the service.

Which document starts the LLC?

the Connecticut Secretary of State accepts the Certificate of Organization.

What is the processing time for a Connecticut LLC filing?

According to the filing office: Most online filings automatically accepted.

Is a registered agent mandatory for a Connecticut LLC?

Yes. Connecticut requires one, with a physical street address in the state, from the day the LLC exists.

What recurring paperwork follows an LLC in Connecticut?

A single item: the annual report, filed every year (on or before March 31) for $80.

Does the service price cover the EIN?

The Mainstay Filing yearly price covers it. Connecticut Registered Agent.co and CT Registered Agent.org list it at $99. The IRS does not charge for issuing an EIN.

What is the best LLC service in Connecticut, by our report?

Connecticut Registered Agent.co: $199 plus the Connecticut filing fee, year-one registered agent service included, then $99 a 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. Processing and expedite, official source (verified October 2026)
  8. Pulled November 12, 2026: Connecticut Registered Agent.co, pricing and service pages
  9. Pulled November 12, 2026: CT Registered Agent.org, pricing and service pages
  10. Pulled November 12, 2026: Mainstay Filing, Connecticut service page