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3 Best Foreign Registration Services in Connecticut (2026) and What to Check

For foreign registration services in Connecticut, we recommend Connecticut Registered Agent.co ($199), Mainstay Filing ($199) and CT Registered Agent.org ($199) in 2026, ranked from first to last. Registration at the state costs $120 for every filer, and three years of service fees add $397 to $497.
Written by the Simple Filing Guide editorial team

Do this first

Fee at the state
$120
Proof from home?
Yes (90 days maximum age)
Afterward
$80, annual report
Recommended
Connecticut Registered Agent.co, Mainstay Filing then CT Registered Agent.org

Recommended in Connecticut

The order follows our five checks: three-year cost first, then what the price covers.

#1 Start here

1. Connecticut Registered Agent.co: best for a budget registration

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

Start with Connecticut Registered Agent.co in Connecticut: $199 files the registration, and the agent renews at $99 each year.

Its three-year total is below Mainstay Filing, which puts it first for a company that stays in one state.

Checklist: what is included
  • Registration handled
  • No agent charge in year one
What works
  • A free agent year at the start
  • Then $99 annually
  • Registers you for $199
Gaps
  • Covers Connecticut only, so your home state needs its own agent
Go to Connecticut Registered Agent.co Partner link. We may earn money if you buy.
#2 Nationwide

2. Mainstay Filing: best for registering in many states

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

Mainstay Filing follows since you pay $199 plus Connecticut's fee, get a free first registered agent year and then pay $149 a year.

Connecticut Registered Agent.co is $100 lower across three years, which is enough to rank above it.

Every state charges the same $149 a year for the registered agent after year one.

Checklist: what is included
  • Out-of-state registration handled
  • Registered agent, free for year one
  • Fifty states, one fee
What works
  • One fee for any state
  • A free first year of agent service
  • Adds $199 to the state fee
Gaps
  • Pay $50 more a year for the agent
Go to Mainstay Filing Partner link. We may earn money if you buy.
#3 One-state pick

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

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

Next, consider CT Registered Agent.org: $199 files the registration, and the agent renews at $99 each year.

Both publish identical prices, so pick whichever you like better.

Checklist: what is included
  • Registration handled
  • No agent charge in year one
What works
  • Then $99 annually
  • A free agent year at the start
  • Registers you for $199
Gaps
  • Covers Connecticut only, so your home state needs its own agent
Go to CT Registered Agent.org Partner link. We may earn money if you buy.

Price comparison

#CompanyFirst-year priceYearly afterThree-year costIncluded
1 Connecticut Registered Agent.co $199$99/yr$397registration handled; no agent charge in year one Go to Connecticut Registered Agent.co Partner link. We may earn money if you buy.
2 Mainstay Filing $199$149/yr$497Out-of-state registration handled; registered agent, free for year one; fifty states, one fee Go to Mainstay Filing Partner link. We may earn money if you buy.
3 CT Registered Agent.org $199$99/yr$397registration handled; no agent charge in year one Go to CT Registered Agent.org Partner link. We may earn money if you buy.

These are service fees only, taken from each company's prices on November 13, 2026. State fees stay the same with every pick.

Questions to settle

When must an out-of-state LLC register here?

Before an LLC formed elsewhere starts business in Connecticut, it registers.

Without registration, expect fees owed for the gap before registering.

business.ct.gov / October 2026 / confirmed

How much should I budget to register?

Plan on $120 for the state; a service adds $199.

Over three years the state's fees reach $280, counting any recurring report. business.ct.gov / October 2026 / confirmed

Which form do I file, and with whom?

The Connecticut Secretary of the State, Business Services Division handles registrations, and the Foreign Registration Statement, Limited Liability is the one to file.

The filing needs certificate of existence (certificate of good standing) from the state of formation issued within the last 90 days.

What do I owe once registered?

The state wants a annual report later, priced at $80.

The state sets the deadline at Between January 1 and March 31.

Why is the list in this order?

Connecticut Registered Agent.co wins on total for three years, a 37% check.

Five checks set the order: total for three years (37%), filing jobs included (27%), clear price information (13%), year-two price (12%) and state coverage (11%).

$397 for three years at Connecticut Registered Agent.co is $100 under Mainstay Filing.

See the scoring

What Connecticut requires to register

ItemDetailsVerify
Registration fee $120business.ct.gov / October 2026 / confirmed
Home-state certificate Yes, 90 daysbusiness.ct.gov / October 2026 / confirmed
Annual report $80business.ct.gov / October 2026 / confirmed
State total, years one to three $280Added from the rows

To check the three-year number, add the formation filing, the next two reports and any minimum tax; costs with no fixed price are not counted.

Related questions

What about the state where I formed the LLC?

Both states apply their own rules, so keep an agent at home too. A provider active in every state, such as Mainstay Filing, can cover both.

What do the picks cost over three years?

Totals to compare: Connecticut Registered Agent.co at $397, Mainstay Filing at $497, CT Registered Agent.org at $397 (services only).

Are the fees official?

State-set fees come from Connecticut's publications; what services charge comes from the prices they post.

Does the state require a service?

No. A service charges for labor and the agent role, not for anything the state demands.

Do these companies handle the filing?

Each company on this page files it for you; the state charges the same regardless.

Who ranks first in Connecticut?

Connecticut Registered Agent.co comes first: the fee is $199 with the first year of agent service included, then $99 annually. Next, Mainstay Filing and CT Registered Agent.org.

Verify these facts

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