Foreign registration ratings · Connecticut
3 Best Foreign Registration Services in Connecticut (2026)
1. Mainstay Filing: best for companies registered in more than one state
Service fee $199, with $319 due at checkout including the state fee; agent $149 a year after that
Mainstay Filing is rated first: $199 plus state fees in any state, first-year registered agent service included.
The agent line is $149 a year from year two, identical across states, after a free first year.
On three-year sums Mainstay is $100 above Connecticut Registered Agent.co; the wider coverage justifies that gap in the rating.
What you get
- The registration, prepared and filed for you
- A free first year of registered agent service
- No-fee scans of service of process on the day it is received
Pros
- $199 service fee, state fee separate
- Registered agent, no charge in year one
- The same amount in all fifty states
- Same-business-day scans of service of process, no fee
Trade-offs
- Agent renewal of $149 is $50 over Connecticut Registered Agent.co
2. Connecticut Registered Agent.co: best for adding Connecticut and nothing else
Service fee $199, state fee on top; agent $99 a year after that
Connecticut Registered Agent.co is rated second: $199 plus the state fee, year-one registered agent service included, then $99 a year for the agent.
The plan lists an in-state street address as the registered office and scans papers served there into your account.
What you get
- Filing with the state
- The first year as your registered agent
Pros
- Year-two agent amount: $99
- Includes year one as your registered agent
- $199 to register, state fee on top
Trade-offs
- Connecticut only; your home state needs its own agent
- EIN application billed at $99
3. CT Registered Agent.org: best for Connecticut registrations only
Service fee $199, state fee on top; agent $99 a year after that
CT Registered Agent.org is rated third: $199 plus the state fee, year-one registered agent service included, then $99 a year for the agent.
The plan lists an in-state street address as the registered office and scans papers served there into your account.
On amounts and features alone, Connecticut Registered Agent.co and CT Registered Agent.org are the same, which makes the order between them a close call.
What you get
- Filing with the state
- The first year as your registered agent
Pros
- $99 a year for the agent after year one
- The first registered agent year is covered
- Registration line of $199, plus the state's fee
Trade-offs
- Connecticut only; your home state needs its own agent
- EIN application billed at $99
The 3 ratings summarized
| Line | Service | Rating | Service fee | Year two | Best for | Open |
|---|---|---|---|---|---|---|
| 1 | Mainstay Filing | 9.5 | $199 | $149/yr | Companies that register in several states | Visit Mainstay FilingPartner link. We may earn money if you buy. |
| 2 | Connecticut Registered Agent.co | 9.2 | $199 | $99/yr | The lowest agent renewal we rank here | Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy. |
| 3 | CT Registered Agent.org | 8.9 | $199 | $99/yr | The lowest agent renewal we rank here | Visit CT Registered Agent.orgPartner link. We may earn money if you buy. |
Connecticut foreign registration service amounts for 2026: year one, renewal and three-year sum
| Service | Year one | Year two | Year three | Three-year sum | Agent paid for year one |
|---|---|---|---|---|---|
| Mainstay Filing | $199 | $149 | $149 | $497 | Free |
| Connecticut Registered Agent.co | $199 | $99 | $99 | $397 | Included |
| CT Registered Agent.org | $199 | $99 | $99 | $397 | Included |
Reasoning behind the order
Formation Rated puts 27% on cost over years one to three, 27% on inclusions per price and the other 46% on renewal price and terms, fit with state rules and price clarity. In Connecticut the order came down to inclusions per price.
A foreign registration involves two states, and one provider with one amount in both rated highest on coverage, ahead of Connecticut Registered Agent.co.
Each criterion and its weight is listed on How we rank.
Connecticut foreign LLC registration: amount, form and office
A company from another state registers by lodging the Foreign Registration Statement, Limited Liability with the Connecticut Secretary of the State, Business Services Division; the state amount is $120. Connecticut also needs certificate of existence (certificate of good standing) from the state of formation, issued inside 90 days of the filing.
Registration adds one recurring line: the annual report ($80), due between January 1 and March 31.
Have these ready
- Certificate of existence (certificate of good standing) from the state of formation, issued within 90 days before the filing.
- Home-state legal name, spelled exactly, and the formation date.
- An in-state registered agent; every service rated here can fill the role.
- $120 to the state, paid with the filing.
- The date of the annual report and its $80 fee on your calendar.
What skipping Connecticut registration costs
Fees for the unregistered years are also owed.
Connecticut foreign registration service: your questions
Is registration compulsory for an outside LLC doing business in Connecticut?
Yes, once it does business there.
What are the costs of foreign registration in Connecticut?
$120 to the state plus $199 to the service.
Must the filing include a home-state certificate for Connecticut?
Yes: certificate of existence (certificate of good standing) from the state of formation, with an issue date within 90 days.
Must a registered agent stay on file after registering?
Yes. A registered agent with a street address in the state stays on record.
Which foreign registration services are rated on this page?
Mainstay Filing ($199), Connecticut Registered Agent.co ($199) and CT Registered Agent.org ($199), highest rated first.
Which foreign registration service holds the top rating in Connecticut?
Mainstay Filing, as $199 on top of the state's fee, with year one as registered agent free and the same amount in every state.
Source lines
- Connecticut Secretary of the State, Business Services Division (ledger date August 2026)
- Connecticut Secretary of the State, Business Services Division (ledger date August 2026)
- Connecticut yearly filing: Annual report: fee, official source (ledger date October 2026)
- Connecticut report due date (ledger date August 2026)
- Connecticut formation fee: Filing fee, official source (ledger date October 2026)
- Connecticut formation fee: Filing fee, official source (ledger date October 2026)
- Foreign LLC forms and fees, Business.CT.gov (ledger date October 2026)
- Foreign Registration Statement form (ledger date October 2026)
- Foreign investigations penalties (ledger date October 2026)
- Who can be an agent (ledger date October 2026)
- Foreign annual report forms and fees (ledger date October 2026)
- Mainstay Filing, Connecticut service page: amounts read November 12, 2026
- Connecticut Registered Agent.co, pricing and service pages: amounts read November 12, 2026
- CT Registered Agent.org, pricing and service pages: amounts read November 12, 2026