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Biz Formation Report

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

Foreign registration report · Connecticut

3 Best Foreign Registration Services in Connecticut (2026)

By the Biz Formation Report editorial team

Biz Formation Report ranks foreign registration services in Connecticut for 2026 as Mainstay Filing ($199), CT Registered Agent.org ($199) and Connecticut Registered Agent.co ($199), in that order. Mainstay Filing earns the top grade: the Connecticut registration is filed for $199, and the registered agent is free in year one, then $149 a year.

No.1

Top pick on this page

1. Mainstay Filing: best for companies registered in several states

Score9.6out of 10
$199 service fee, $319 due at checkout with the state fee; the agent is $149 annually from year two

Top grade, Mainstay Filing: $199 added to the state fee in any state, with a year of registered agent service included.

Beyond the free first year, agent service is $149 annually in any state.

Over three years Mainstay costs $100 more than CT Registered Agent.org; our grading treats the broader coverage as worth that.

What you get

  • Registration prepared and filed on your behalf
  • A free first registered agent year
  • Legal papers served on the company scanned free, the same business day

Good

  • Registered agent at no cost in year one
  • One price across all fifty states
  • $199 service fee plus the state's fee
  • Served papers scanned within the same business day, free

Weak spots

  • The agent renews at $149, $50 more than CT Registered Agent.org
Visit Mainstay FilingPartner link. We may earn money if you buy.
Read the Mainstay Filing review
No.2

Best for a Connecticut-only company

2. CT Registered Agent.org: best for companies adding Connecticut alone

Score9.2out of 10
$199 service fee and the state fee on top; the agent is $99 annually from year two

Second grade, CT Registered Agent.org: $199 plus the state fee, one year of registered agent service included, 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.

What you get

  • The registration filing
  • The first year as your registered agent

Good

  • Registration costs $199 before the state fee
  • Agent at $99 a year after year one
  • First-year registered agent service is part of the price

Weak spots

  • Serves Connecticut only; the home state still needs its own agent
  • 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

Low renewal

3. Connecticut Registered Agent.co: best for registering in Connecticut only

Score9.0out of 10
$199 service fee and the state fee on top; the agent is $99 annually from year two

Third grade, Connecticut Registered Agent.co: $199 plus the state fee, one year of registered agent service included, 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 two state services, CT Registered Agent.org and Connecticut Registered Agent.co, match on price and features, and the order between them is a narrow call.

What you get

  • The registration filing
  • The first year as your registered agent

Good

  • Then $99 per year for the agent
  • $199 for registration, plus the state fee
  • Year-one registered agent service is covered

Weak spots

  • Serves Connecticut only; the home state still needs its own agent
  • 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

Summary of the 3 grades

RankProviderGradeService feeYear twoBest fitSite
1Mainstay Filing9.6$199$149/yrCompanies with a presence in several statesVisit Mainstay FilingPartner link. We may earn money if you buy.
2CT Registered Agent.org9.2$199$99/yrThe lowest agent renewal we rank hereVisit CT Registered Agent.orgPartner link. We may earn money if you buy.
3Connecticut Registered Agent.co9.0$199$99/yrThe lowest agent renewal we rank hereVisit Connecticut Registered Agent.coPartner link. We may earn money if you buy.

Each grade out of 10 comes from Biz Formation Report's editors and the weighted criteria on How we rank; no customer ratings are involved.

Connecticut foreign registration service prices, 2026: year one, renewal and three-year outlay

ProviderYear 1Year 2Year 3Three-year outlayYear-one agent covered
Mainstay Filing$199$149$149$497Free
CT Registered Agent.org$199$99$99$397Included
Connecticut Registered Agent.co$199$99$99$397Included

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

Why Mainstay Filing ranks first

Biz Formation Report grades three-year bill and what the money buys at 32% each, leaving 36% for renewal handling, local rules match and pricing openness. In Connecticut, what the money buys settled the order.

Foreign registration always involves two states, and one provider with one price in both graded best on coverage, ahead of CT Registered Agent.org.

Every criterion and weight is listed on How we rank.

Connecticut foreign LLC registration: fee, document and filing office

To register, the outside company submits the Foreign Registration Statement, Limited Liability to the Connecticut Secretary of the State, Business Services Division, with a state fee of $120. Connecticut also wants certificate of existence (certificate of good standing) from the state of formation, dated within 90 days of the filing.

After registration the company owes the annual report ($80), due between January 1 and March 31.

Documents to have on hand

  • Certificate of existence (certificate of good standing) from the state of formation, dated within 90 days of filing.
  • The legal name as recorded in the home state, and the date of formation.
  • An in-state registered agent; any provider in this report can serve.
  • Payment of the $120 state fee with the filing.
  • The due date of the annual report and its $80 fee, noted in your calendar.

The cost of skipping Connecticut registration

Fees owed for the unregistered period are collected as well.

Connecticut foreign registration service: common questions

Must an LLC from another state register with Connecticut?

Yes, as soon as it transacts business there.

How much does Connecticut foreign registration cost?

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

Does Connecticut demand proof of good standing from the home state?

Yes. The filing needs certificate of existence (certificate of good standing) from the state of formation, issued no more than 90 days ago.

Is a registered agent still needed after foreign registration?

Yes. A registered agent with a street address in the state has to remain on file.

Which foreign registration services does this report rank?

Mainstay Filing ($199), CT Registered Agent.org ($199) and Connecticut Registered Agent.co ($199), in descending order of grade.

What is the best foreign registration service for Connecticut?

Mainstay Filing: $199 plus the state's fee, with the registered agent free for year one and one price in every state.

Read next

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. Foreign LLC forms and fees, Business.CT.gov (verified October 2026)
  8. Foreign Registration Statement form (verified October 2026)
  9. Foreign investigations penalties (verified October 2026)
  10. Who can be an agent (verified October 2026)
  11. Foreign annual report forms and fees (verified October 2026)
  12. Pulled November 12, 2026: Mainstay Filing, Connecticut service page
  13. Pulled November 12, 2026: CT Registered Agent.org, pricing and service pages
  14. Pulled November 12, 2026: Connecticut Registered Agent.co, pricing and service pages