Place1
Best hereConnecticut Registered Agent.co
1. Connecticut Registered Agent.co: best for companies adding only Connecticut
$199 to register, $99 yearly after
Our mark9.6out of 10
Top of our list: Connecticut Registered Agent.co, for a $199 service fee for the Connecticut registration and a $99 agent renewal.
Served documents are scanned and shared online, and the registered office is a Connecticut street address.
Its edge over Mainstay Filing is cost, which carries the most weight in our scoring.
What you get
- Foreign registration done for you
- A year of registered agent service
Why pick it
- A year of registered agent service included
- $199 to register
- Then $99 a year
Less good
- No help outside Connecticut
- EIN costs $99 more
Place2
One price, any stateMainstay Filing
2. Mainstay Filing: best for companies registered in several states
$199 to register, $149 yearly after
Our mark9.3out of 10
In second place, Mainstay Filing: it prepares and files the Connecticut registration for $199 and names itself your registered agent, free for year one.
Its agent renews at $149 a year after the free first year, and the same price applies in every state you register in.
It costs $100 more than Connecticut Registered Agent.co over three years, which is why it sits below it on our cost score.
What you get
- Registration prepared and filed
- Your registered agent, free for the first year
- Service of process scanned the same business day, no fee
Why pick it
- Same price in all fifty states
- Registered agent free for the first year
- Service of process scanned the same business day, no fee
- $199 over the state fee
Less good
- Connecticut Registered Agent.co's agent renews for $50 less
Place3
Lower renewal than MainstayCT Registered Agent.org
3. CT Registered Agent.org: best for a Connecticut-only registration
$199 to register, $99 yearly after
Our mark9.1out of 10
Number 3 is CT Registered Agent.org: a $199 service fee for the Connecticut registration and a $99 agent renewal.
Served documents are scanned and shared online, and the registered office is a Connecticut street address.
With identical published prices, Connecticut Registered Agent.co and CT Registered Agent.org are separated only narrowly.
What you get
- Foreign registration done for you
- A year of registered agent service
Why pick it
- Then $99 a year
- $199 to register
- A year of registered agent service included
Less good
- No help outside Connecticut
- EIN costs $99 more
Shortlist at a glance
| Rank | Service | Our score | Service fee | Year two | Best for | Link |
|---|
| 1 | Connecticut Registered Agent.co | 9.6 | $199 | $99/yr | Lowest agent renewal on this list | Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy. |
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| 2 | Mainstay Filing | 9.3 | $199 | $149/yr | Companies registered in several states | Visit Mainstay FilingPartner link. We may earn money if you buy. |
|---|
| 3 | CT Registered Agent.org | 9.1 | $199 | $99/yr | Lowest agent renewal on this list | Visit CT Registered Agent.orgPartner link. We may earn money if you buy. |
|---|
Editorial scores out of 10 from The Founders Review, using the criteria explained on How we rank. No customer ratings are involved.
Connecticut pricing for 2026: what each service costs
| Service | Year one | Year two | Year three | Three-year total | Agent in year one |
|---|
| Connecticut Registered Agent.co | $199 | $99 | $99 | $397 | Included |
|---|
| Mainstay Filing | $199 | $149 | $149 | $497 | Free |
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| CT Registered Agent.org | $199 | $99 | $99 | $397 | Included |
|---|
We read these prices on the companies' own sites on November 12, 2026. Connecticut's registration fee ($120) is paid on top with every service and is left out of these totals.
What decided the ranking
The Founders Review weighs five things, led by three-year cost and what one price covers at 30% each. For Connecticut, three-year cost is what separated first place from second.
Connecticut Registered Agent.co's three-year total is $397 ($100 below Mainstay Filing). Both include the first agent year, so the renewal price after that decided it.
More on the criteria: How we rank.
Connecticut foreign LLC registration (2026)
Registering costs $120 at the Connecticut Secretary of the State, Business Services Division, using the Foreign Registration Statement, Limited Liability. Connecticut also wants certificate of existence (certificate of good standing) from the state of formation, dated within 90 days.
After registering, the company files the annual report ($80), due between January 1 and March 31.
Before you file
- Certificate of existence (certificate of good standing) from the state of formation, issued no more than 90 days before you file.
- The company's home-state name and formation date.
- A registered agent with a street address in the state; every service ranked here names itself in that role.
- The $120 state fee, paid with the filing.
- A date in your calendar for the annual report and its $80 fee.
Risks of skipping registration
Back fees for the time it operated without registering are due as well.
Connecticut foreign registration service questions
Do I need to register my out-of-state LLC in Connecticut?
Yes, if the company transacts business there.
How much does foreign registration cost in Connecticut?
Budget $120 for the state and $199 for the service.
Do I need a certificate from my home state?
Yes: certificate of existence (certificate of good standing) from the state of formation, dated within 90 days of filing.
Do I need a registered agent after registering?
Yes. Every LLC must name a registered agent with an in-state street address.
Which foreign registration services do you rank here?
Connecticut Registered Agent.co ($199), Mainstay Filing ($199) and CT Registered Agent.org ($199), in the order shown.
Which foreign registration service is best in Connecticut?
Connecticut Registered Agent.co ranks first on our method: Connecticut registration at $199 plus state fees, agent included for year one.
Official sources and price pages
- August 2026 check of Connecticut Secretary of the State, Business Services Division: business.ct.gov/business-services/file-annual-report
- August 2026 check of Connecticut Secretary of the State, Business Services Division: business.ct.gov/knowledge-base/articles/annual-report/file-an-annual-r
- October 2026 check of Connecticut yearly filing: Annual report: fee, official source: business.ct.gov/knowledge-base/articles/domestic-annual-report-forms-a
- August 2026 check of Connecticut report due date: www.cga.ct.gov/current/pub/chap_613a.htm
- October 2026 check of Connecticut formation fee: Filing fee, official source: business.ct.gov/knowledge-base/articles/domestic-limited-liability-com
- October 2026 check of Connecticut formation fee: Filing fee, official source: business.ct.gov/-/media/businessonestop/fee-schedule-revised-712020.pd
- October 2026 check of Foreign LLC forms and fees, Business.CT.gov: business.ct.gov/knowledge-base/articles/foreign-limited-liability-comp
- October 2026 check of Foreign Registration Statement form: business.ct.gov/-/media/sots/business-services/bsd-forms/limited-liabi
- October 2026 check of Foreign investigations penalties: business.ct.gov/knowledge-base/articles/foreign-investigations-penalti
- October 2026 check of Who can be an agent: business.ct.gov/knowledge-base/articles/who-can-be-an-agent
- October 2026 check of Foreign annual report forms and fees: business.ct.gov/knowledge-base/articles/foreign-annual-report-forms-an
- Connecticut Registered Agent.co: pricing and service pages, read November 12, 2026
- Mainstay Filing: Connecticut service page, read November 12, 2026
- CT Registered Agent.org: pricing and service pages, read November 12, 2026