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Plain CharterLLC questions, short answers.

Short answers · Connecticut

3 Best Foreign Registration Services in Connecticut (2026), Plainly Answered

Asked who to hire in Connecticut in 2026, we'd say Mainstay Filing ($199), Connecticut Registered Agent.co ($199) and CT Registered Agent.org ($199), in that order. On top of the $120 state fee, service fees come to $397 to $497 over three years.

By the Plain Charter editorial team ·

Short version

Cost to file
$120
Certificate required?
Yes (90 days old at most)
After registering
$80, annual report
Best picks
Mainstay Filing, Connecticut Registered Agent.co then CT Registered Agent.org

Who we'd hire in Connecticut

Prices come from each company's own pricing. How we choose.
1Best overall

1. Mainstay Filing: best for registering in several states

Service $199, agent renewal $149

Start with Mainstay Filing: you pay $199 to register and nothing for the registered agent until year two.

Three years cost $100 more than Connecticut Registered Agent.co; reach across states decides it here.

The registered agent renews at $149 a year in every state.

The price covers

  • Application prepared and sent
  • Registered agent, no charge in year one
  • Fifty-state coverage

Upsides

  • Registered agent free in year one
  • Ready for the next state
  • Service fee $199

What to weigh

  • Higher agent renewal ($149)
Visit Mainstay FilingPartner link. We may earn money if you buy.
2Connecticut only

2. Connecticut Registered Agent.co: best for a low yearly agent cost

Service $199, agent renewal $99

Connecticut Registered Agent.co is next: it charges $199 to register with a first year of agent service, then $99 a year.

The price covers

  • Application prepared and sent
  • Agent service for year one

Upsides

  • Agent service, year one
  • Registers for $199
  • $99 a year for the agent after

What to weigh

  • Home state needs a separate agent
Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy.
3Connecticut only

3. CT Registered Agent.org: best for a second in-state filer

Service $199, agent renewal $99

CT Registered Agent.org is next: it charges $199 to register with a first year of agent service, then $99 a year.

Connecticut Registered Agent.co charges the same, so this one is a close second.

The price covers

  • Application prepared and sent
  • Agent service for year one

Upsides

  • Registers for $199
  • $99 a year for the agent after
  • Agent service, year one

What to weigh

  • Home state needs a separate agent
Visit CT Registered Agent.orgPartner link. We may earn money if you buy.

How the picks compare

#CompanyYear oneRenewalOver three yearsIn the price
1Mainstay Filing$199$149/yr$497application prepared and sent; registered agent, no charge in year one; Fifty-state coverageVisit Mainstay FilingPartner link. We may earn money if you buy.
2Connecticut Registered Agent.co$199$99/yr$397application prepared and sent; agent service for year oneVisit Connecticut Registered Agent.coPartner link. We may earn money if you buy.
3CT Registered Agent.org$199$99/yr$397application prepared and sent; agent service for year oneVisit CT Registered Agent.orgPartner link. We may earn money if you buy.
Prices as published on November 12, 2026. The state's own fees are listed in the requirements below.

Common questions

Does my out-of-state LLC need to register?

Before it does business in Connecticut, an LLC formed elsewhere registers with the Connecticut Secretary of the State, Business Services Division.

The cost of not registering: back fees.

from business.ct.gov · October 2026

What are the fees?

The state charges $120; a service adds $199.

Three years of state fees, registration included: $280. from business.ct.gov · October 2026

What gets filed?

Your LLC is registered once the Connecticut Secretary of the State, Business Services Division accepts the Foreign Registration Statement, Limited Liability.

Send along certificate of existence (certificate of good standing) from the state of formation no older than 90 days.

What does staying registered cost?

The annual report, at $80.

When: Between January 1 and March 31.

Why this order?

It comes down to what the price takes off your plate, where Mainstay Filing is strongest.

Three-year cost counts for 35% and what the price takes off your plate for 30%; the other three criteria are smaller.

Two states, one provider: that is why it ranks first.

Our full method

The official requirements

RequirementDetailSource
State filing fee$120from business.ct.gov · October 2026
Certificate from home stateYes, 90 daysfrom business.ct.gov · October 2026
Annual report$80from business.ct.gov · October 2026
State fees, first three years$280Total of these fees
Filing fee, the reports in years two and three, then any minimum tax: that is the three-year line.

A few more questions

Does the home state still need an agent?

Yes, each state follows its own rule. A one-state service covers only this state.

What do the picks cost over three years?

Mainstay Filing $497, Connecticut Registered Agent.co $397 and CT Registered Agent.org $397, before state fees.

Where do these figures come from?

Official schedules for state fees, company pricing for service fees, all dated on this page.

Do I have to use a service?

No. The state accepts filings from owners; a service saves time and handles the agent role.

Will these services file it?

Any of the picks can file it for you at the same state fee.

Which foreign registration service would you pick in Connecticut?

First Mainstay Filing, then Connecticut Registered Agent.co and CT Registered Agent.org.

Official sources and prices

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