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Short reply · Connecticut

3 Best Foreign Registration Services in Connecticut (2026), Ranked

Connecticut 2026 ranking of foreign registration services: Mainstay Filing ($199), Connecticut Registered Agent.co ($199) and CT Registered Agent.org ($199). Registering costs $120 at Connecticut, whoever files, plus $397 to $497 to a service over three years.

LLC Q and A editorial team ·

Quick answers

Fee to the state
$120
Home-state certificate?
Required (90 day age limit)
After registering
$80, annual report
Pick
Mainstay Filing, Connecticut Registered Agent.co then CT Registered Agent.org

Best in Connecticut, in order

Prices come from each company's own page. See the method.
1#1 pick

1. Mainstay Filing: best for a growing LLC

Service $199 plus $120 to the state; agent renewal $149

#1 in Connecticut: Mainstay Filing, because you pay $199 plus Connecticut's fee, nothing for the registered agent in year one, then $149 a year.

Not the lowest bill: Connecticut Registered Agent.co is $100 less over three years, in Connecticut only.

Registered agent: free in year one, $149 a year after, in any state.

Price covers

  • Registration filing
  • Registered agent, free first year
  • One fee for all fifty states

For

  • $199 plus Connecticut's fee
  • Same fee in every state
  • First agent year covered

Against

  • Renewal $50 over Connecticut Registered Agent.co
Mainstay Filing sitePartner link. We may earn money if you buy.
2Connecticut only

2. Connecticut Registered Agent.co: best for registering in just this state

Service $199 plus $120 to the state; agent renewal $99

Why Connecticut Registered Agent.co is second: $199 files the registration and the agent renews at $99.

Price covers

  • Foreign filing handled
  • First-year agent included

For

  • $199 plus state fee
  • Then $99 a year
  • Year-one agent included

Against

  • Nothing outside this state
Connecticut Registered Agent.co sitePartner link. We may earn money if you buy.
3Connecticut only

3. CT Registered Agent.org: best for one more state only

Service $199 plus $120 to the state; agent renewal $99

Why CT Registered Agent.org is third: $199 files the registration and the agent renews at $99.

Same published prices as Connecticut Registered Agent.co, so the order between them is close.

Price covers

  • Foreign filing handled
  • First-year agent included

For

  • Then $99 a year
  • Year-one agent included
  • $199 plus state fee

Against

  • Nothing outside this state
CT Registered Agent.org sitePartner link. We may earn money if you buy.

Side by side

#ServiceFirst yearRenewalTotal, 3 yearsIncludes
1Mainstay Filing$199$149/yr$497registration filing; registered agent, free first year; one fee for all fifty statesMainstay Filing sitePartner link. We may earn money if you buy.
2Connecticut Registered Agent.co$199$99/yr$397foreign filing handled; First-year agent includedConnecticut Registered Agent.co sitePartner link. We may earn money if you buy.
3CT Registered Agent.org$199$99/yr$397foreign filing handled; First-year agent includedCT Registered Agent.org sitePartner link. We may earn money if you buy.
Read November 13, 2026; three years = year one + two renewals.

Key questions

When must an out-of-state LLC register?

Before it does business in Connecticut, with the Connecticut Secretary of the State, Business Services Division.

Unregistered, an LLC may face fees owed for the time before registering.

business.ct.gov (October 2026) is the source of record

What does registering cost?

$120 at the state. A service adds $199.

State fees reach $280 over three years, counting any recurring report. business.ct.gov (October 2026) is the source of record

Which form, filed where?

Lodge the Foreign Registration Statement, Limited Liability at the Connecticut Secretary of the State, Business Services Division; one filing registers the LLC.

Attach certificate of existence (certificate of good standing) from the state of formation issued in the last 90 days.

What is due after registering?

Expect the annual report ($80).

Deadline per the state: Between January 1 and March 31.

What decided #1?

Mainstay Filing scores best on chores removed from your list, which is 26% of the total.

62% of the total is three-year price plus chores removed from your list.

An out-of-state LLC works in two states; the first pick serves both.

The five criteria

What Connecticut requires of a foreign LLC

ItemDetailSource
Fee to register$120business.ct.gov (October 2026) is the source of record
Good standing certificateRequired, 90 daysbusiness.ct.gov (October 2026) is the source of record
Annual report$80business.ct.gov (October 2026) is the source of record
State fees, 3 years$280Sum of the rows above
To verify the total: filing fee, two later reports, minimum tax if one applies. Costs without a set amount are excluded.

Also asked

Is an agent needed at home too?

Yes. Each state has its own rule. Mainstay Filing serves both from one account.

What do the picks cost over three years?

Totals over three years: Mainstay Filing at $497, Connecticut Registered Agent.co at $397, CT Registered Agent.org at $397, services only.

Where do the numbers come from?

State fees come from Connecticut's official documents. Service prices come from each company's price page. Both are dated here.

Is a service required?

No law requires a service; it is a paid convenience.

Does a service file it?

All of them do; only the service fee differs.

Best foreign registration service in Connecticut?

Mainstay Filing: registration is $199 and the registered agent costs nothing until year two. Behind it: Connecticut Registered Agent.co and CT Registered Agent.org.

Sources

  1. Q and A source note covering Connecticut Secretary of the State, found at business.ct.gov and dated August 2026, kept on file
  2. Q and A source note covering Connecticut Secretary of the State, found at business.ct.gov and dated August 2026, kept on file
  3. Q and A source note covering Connecticut yearly filing: Annual report, found at business.ct.gov and dated October 2026, kept on file
  4. Q and A source note covering Connecticut report due date, found at cga.ct.gov and dated August 2026, kept on file
  5. Q and A source note covering Connecticut formation fee: Filing fee, found at business.ct.gov and dated October 2026, kept on file
  6. Q and A source note covering Connecticut formation fee: Filing fee, found at business.ct.gov and dated October 2026, kept on file
  7. Q and A source note covering Foreign LLC forms and fees, found at business.ct.gov and dated October 2026, kept on file
  8. Q and A source note covering Foreign Registration Statement form, found at business.ct.gov and dated October 2026, kept on file
  9. Q and A source note covering Foreign investigations penalties, found at business.ct.gov and dated October 2026, kept on file
  10. Q and A source note covering Who can be an agent, found at business.ct.gov and dated October 2026, kept on file
  11. Q and A source note covering Foreign annual report forms and, found at business.ct.gov and dated October 2026, kept on file
  12. Mainstay Filing Connecticut service page, read November 13, 2026
  13. Connecticut Registered Agent.co pricing page, read November 13, 2026
  14. CT Registered Agent.org pricing page, read November 13, 2026