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Straight talk · Connecticut

3 Best Foreign Registration Services in Connecticut (2026), No Jargon

If you need foreign registration services in Connecticut in 2026, we'd go with Mainstay Filing ($199), Connecticut Registered Agent.co ($199) and CT Registered Agent.org ($199), in that order. Connecticut charges $120 to register, and the services add $397 to $497 over three years.
From the LLC Plainly editorial team

Quick take

You pay the state
$120
Home-state paper needed?
Needed (90 days old, tops)
What comes next
$80, annual report
Who we like
Mainstay Filing, Connecticut Registered Agent.co then CT Registered Agent.org

Who we like in Connecticut

The scoring is spelled out on this page.
Best overall

1. Mainstay Filing: best for adding several states

First year $199 (state's $120 separate); $149 after

We'd use Mainstay Filing in Connecticut. Its $199 fee is the same in every state, and the first registered agent year comes with it.

You'd save $100 over three years with Connecticut Registered Agent.co. The catch is it doesn't work outside Connecticut.

Expect $149 a year for the registered agent after the first year, wherever you are.

Your money buys

  • The registration filing
  • Registered agent, included the first year
  • No change in price by state

The good

  • $199 on top of Connecticut's fee
  • Fifty states covered
  • A free first year of agent service

Trade-offs

  • Connecticut Registered Agent.co charges $50 less to renew the agent
One-state pick

2. Connecticut Registered Agent.co: best for adding just this one state

First year $199 (state's $120 separate); $99 after

Connecticut Registered Agent.co takes second, because registering costs $199 above the state fee and the agent is covered in year one, then $99 a year.

Your money buys

  • The foreign filing, submitted
  • No agent charge in year one

The good

  • You don't pay for an agent in year one
  • A small renewal of $99
  • Starts at $199 plus the state fee

Trade-offs

  • Only one state covered
One-state pick

3. CT Registered Agent.org: best for another local choice

First year $199 (state's $120 separate); $99 after

CT Registered Agent.org takes third, because registering costs $199 above the state fee and the agent is covered in year one, then $99 a year.

Price for price, it ties Connecticut Registered Agent.co.

Your money buys

  • The foreign filing, submitted
  • No agent charge in year one

The good

  • You don't pay for an agent in year one
  • A small renewal of $99
  • Starts at $199 plus the state fee

Trade-offs

  • Only one state covered

How they compare

#WhoYear oneRenews atThree-year totalWhat you get
1Mainstay Filing$199$149/yr$497the registration filing; registered agent, included the first year; no change in price by stateCheck out Mainstay FilingPartner link. We may earn money if you buy.
2Connecticut Registered Agent.co$199$99/yr$397the foreign filing, submitted; no agent charge in year oneCheck out Connecticut Registered Agent.coPartner link. We may earn money if you buy.
3CT Registered Agent.org$199$99/yr$397the foreign filing, submitted; no agent charge in year oneCheck out CT Registered Agent.orgPartner link. We may earn money if you buy.
Each company's listed prices on November 13, 2026. State fees come on top and don't change by pick.

Your questions, answered

Is registering required for my out-of-state LLC?

Register first, then do business in Connecticut, if your LLC came from another state.

Doing business unregistered can bring back fees owed for the gap before registering.

official: business.ct.gov, October 2026

What should I expect to pay to register?

Budget $120 for the state and $199 for help.

Three years of state charges: $280. official: business.ct.gov, October 2026

What gets submitted?

The Connecticut Secretary of the State, Business Services Division is the office, and the Foreign Registration Statement, Limited Liability is what it wants.

Attach certificate of existence (certificate of good standing) from the state of formation from the past 90 days.

Is there anything to file once I'm registered?

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

Mark the date: Between January 1 and March 31.

Why is the list in this order?

Work taken off your hands, worth 31%, put Mainstay Filing first.

Together, cost across three years and work taken off your hands make up 64% of the score.

Two states, one company: that's what puts it first.

How we pick

Connecticut checklist

ItemDetailsCheck it
What you pay to register$120official: business.ct.gov, October 2026
Home-state certificateNeeded, 90 daysofficial: business.ct.gov, October 2026
Annual report$80official: business.ct.gov, October 2026
Paid to the state by year three$280Sum of the figures above
Each figure above links to the state's official page. The final line is our addition of the filing, two reports and any minimum tax, and it leaves out variable costs.

Also worth knowing

Do I still need an agent where I formed the LLC?

Yes. The state where you formed the LLC keeps its own agent rule, and Mainstay Filing can handle both states on one account.

What does each one cost over three years?

Mainstay Filing will cost you $497, Connecticut Registered Agent.co will cost you $397, CT Registered Agent.org will cost you $397, and state fees are separate.

How official are these figures?

Every state fee links to its official page. Every service price is read from the company's own site.

Does the state make me use a service?

You can skip it. The state's fee is the same whichever way you file.

Will a company file this for me?

All of them do. The state fee doesn't change.

Who would you go with in Connecticut?

Mainstay Filing, because you pay $199 plus Connecticut's fee, skip the registered agent charge in year one and then pay $149 a year. After that, Connecticut Registered Agent.co and CT Registered Agent.org.

Where we got this

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