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

Foreign registration verdict · Connecticut

3 Best Foreign Registration Services in Connecticut (2026)

Filing Verdict's 2026 verdict on foreign registration services in Connecticut: Mainstay Filing ($199), Connecticut Registered Agent.co ($199) and CT Registered Agent.org ($199), in that order. Mainstay Filing takes first place: $199 on top of the state fee, the same in any state, with the first year of registered agent service included.
The Filing Verdict editorial team
Our top pick in Connecticut
Spot 1

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

Service fee $199, $319 due at checkout with the state fee; agent $149 yearly after year one

9.5Editorial score
out of 10

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

After the free first year the agent is $149 a year, whichever state you register in.

The three-year bill is $100 higher than Connecticut Registered Agent.co's, and the wider coverage is worth that to us.

What you get

  • The registration, prepared and submitted for you
  • Free registered agent service for the first year
  • Free same-business-day scans of service of process

What we like

  • Service fee of $199, plus the state's fee
  • One price in all fifty states
  • Same-business-day scans of served papers, free
  • Registered agent service free in year one

Cons

  • After year one its agent runs $149 a year, $50 above Connecticut Registered Agent.co
Visit Mainstay FilingPartner link. We may earn money if you buy. Our full Mainstay Filing verdict
Best local option
Spot 2

2. Connecticut Registered Agent.co: best for companies adding only Connecticut

Service fee $199, state fee extra; agent $99 yearly after year one

9.3Editorial score
out of 10

Second place goes to Connecticut Registered Agent.co: $199 plus the state fee, with a year of registered agent service included, then $99 a year for the agent.

The plan gives the company an in-state street address as its registered office, and papers served on the company are scanned to your online account.

What you get

  • Registration prepared and filed
  • Year-one registered agent service

What we like

  • Then $99 a year for agent service
  • First-year registered agent service comes with it
  • Service fee $199, state fee extra

Cons

  • Covers Connecticut only; your home state needs its own agent
  • The EIN application is billed separately ($99)
Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy. Our full Connecticut Registered Agent.co verdict
Best value here
Spot 3

3. CT Registered Agent.org: best for Connecticut registrations only

Service fee $199, state fee extra; agent $99 yearly after year one

9.1Editorial score
out of 10

Third place goes to CT Registered Agent.org: $199 plus the state fee, with a year of registered agent service included, then $99 a year for the agent.

The plan gives the company an in-state street address as its registered office, and papers served on the company are scanned to your online account.

On price and features Connecticut Registered Agent.co and CT Registered Agent.org match line for line, which makes this a close call between safe choices.

What you get

  • Registration prepared and filed
  • Year-one registered agent service

What we like

  • Includes the first year as your registered agent
  • $199 to register, plus the state's fee
  • $99 a year for the agent from year two

Cons

  • Covers Connecticut only; your home state needs its own agent
  • The EIN application is billed separately ($99)
Visit CT Registered Agent.orgPartner link. We may earn money if you buy. Our full CT Registered Agent.org verdict

The 3 verdicts at a glance

No.ServiceVerdict scoreService feeYear twoBest forVisit
1Mainstay Filing9.5$199$149/yrCompanies registered in several states Visit Mainstay FilingPartner link. We may earn money if you buy.
2Connecticut Registered Agent.co9.3$199$99/yrThe lowest agent renewal here Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy.
3CT Registered Agent.org9.1$199$99/yrThe lowest agent renewal here Visit CT Registered Agent.orgPartner link. We may earn money if you buy.
The marks out of 10 are editorial: Filing Verdict sets them from the criteria on How we rank, and customers do not rate anything here.

Connecticut foreign registration service prices for 2026: year one, renewals and three years

ServiceYear 1Year 2Year 3Total, 3 yearsAgent covered in year one
Mainstay Filing$199$149$149$497Free
Connecticut Registered Agent.co$199$99$99$397Included
CT Registered Agent.org$199$99$99$397Included
Prices were read from each company's own pages on November 12, 2026. Connecticut's $120 registration fee goes on top of every row and is not counted in these totals.

The reasoning behind the order

Filing Verdict gives total over three years and paperwork the price handles 35% each, and renewal behavior, match to the state and up-front pricing split the rest. In Connecticut the order was settled by paperwork the price handles.

Registering in a second state involves two states, so one provider with one price in both scored best on coverage, ahead of Connecticut Registered Agent.co.

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

Connecticut foreign LLC registration: the fee, the form and the filing office

The company registers with the Connecticut Secretary of the State, Business Services Division by filing the Foreign Registration Statement, Limited Liability. The state fee is $120. Connecticut also asks for certificate of existence (certificate of good standing) from the state of formation, issued within 90 days of filing.

Afterwards the company files the annual report ($80), due between January 1 and March 31.

Before you file: a checklist

  • Certificate of existence (certificate of good standing) from the state of formation, issued within 90 days before you file.
  • The exact legal name from the home state, and the date the company was formed there.
  • A registered agent with a street address in the state; each service on this page can act in that role.
  • The $120 state fee, paid with the filing.
  • A calendar entry for the annual report and its $80 fee.

What skipping Connecticut registration can cost

Back fees for the period it operated unregistered are also due.

Connecticut foreign registration service: questions answered

Does Connecticut require an out-of-state LLC to register?

Yes, once it transacts business there.

What does foreign registration cost in Connecticut?

The state fee is $120, and the service fee is $199.

Does Connecticut want a certificate from my home state?

Yes. It asks for certificate of existence (certificate of good standing) from the state of formation, issued within 90 days of filing.

Is a registered agent required once I have registered?

Yes. The company still needs a registered agent here, with a street address in the state.

Which foreign registration services are ranked on this page?

Mainstay Filing ($199), Connecticut Registered Agent.co ($199) and CT Registered Agent.org ($199), from first place to last.

Which foreign registration service is the best pick in Connecticut?

Mainstay Filing, because it prepares the Connecticut registration for $199 and serves as your registered agent, free in year one, then $149 a year.

Keep reading

Sources and dates

  1. Connecticut Secretary of the State, Business Services Division, confirmed August 2026
  2. Connecticut Secretary of the State, Business Services Division, confirmed August 2026
  3. Connecticut yearly filing: Annual report: fee, official source, confirmed October 2026
  4. Connecticut report due date, confirmed August 2026
  5. Connecticut formation fee: Filing fee, official source, confirmed October 2026
  6. Connecticut formation fee: Filing fee, official source, confirmed October 2026
  7. Foreign LLC forms and fees, Business.CT.gov, confirmed October 2026
  8. Foreign Registration Statement form, confirmed October 2026
  9. Foreign investigations penalties, confirmed October 2026
  10. Who can be an agent, confirmed October 2026
  11. Foreign annual report forms and fees, confirmed October 2026
  12. Checked November 12, 2026: Mainstay Filing, Connecticut service page
  13. Checked November 12, 2026: Connecticut Registered Agent.co, pricing and service pages
  14. Checked November 12, 2026: CT Registered Agent.org, pricing and service pages