Skip to content
The Formation Desk

Rankings of registered agents, LLC formation and foreign registration services in all 50 states.

LLC service picks · Connecticut

3 Best LLC Services in Connecticut (2026)

The The Formation Desk call for LLC services in Connecticut in 2026: Connecticut Registered Agent.co ($199), CT Registered Agent.org ($199) and Mainstay Filing ($199), in that order. Connecticut Registered Agent.co takes the call: $199 plus the Connecticut filing fee, first-year registered agent service included, then $99 a year.
Written by The Formation Desk editorial team
1
Our top pick

1. Connecticut Registered Agent.co: best for a Connecticut LLC with no plans to expand

Form for $199; the agent is $99 a year after that, plus the state fee

Editorial score 9.1 out of 10

The desk picks Connecticut Registered Agent.co: Connecticut formation for $199 on top of the state's fee, year-one agent included, then $99 a year to keep the agent.

You get an in-state street address as the registered office, and papers served there are scanned into your account.

It leaves the annual report out of its prices, so you send that filing to Connecticut yourself every year.

Add up three years and it undercuts Mainstay Filing, and cost is one of our two heaviest criteria.

In the price

  • Articles prepared and filed
  • The first year as your registered agent

Strengths

  • Year-one registered agent service is in the price
  • $199 to form, state fee extra
  • The agent costs $99 after year one

Cons

  • No annual report filing included
  • EIN application will cost you $99 more
Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy. Connecticut Registered Agent.co up close
2
Best local option

2. CT Registered Agent.org: best for keeping it local in Connecticut

Form for $199; the agent is $99 a year after that, plus the state fee

Editorial score 8.6 out of 10

Runner-up, CT Registered Agent.org: Connecticut formation for $199 on top of the state's fee, year-one agent included, then $99 a year to keep the agent.

You get an in-state street address as the registered office, and papers served there are scanned into your account.

It leaves the annual report out of its prices, so you send that filing to Connecticut yourself every year.

The published prices and features do not separate Connecticut Registered Agent.co from CT Registered Agent.org; take whichever you like.

In the price

  • Articles prepared and filed
  • The first year as your registered agent

Strengths

  • Then $99 a year for agent service
  • A $199 formation price, state fee on top
  • Year-one registered agent service is in the price

Cons

  • No annual report filing included
  • EIN application will cost you $99 more
Visit CT Registered Agent.orgPartner link. We may earn money if you buy. CT Registered Agent.org up close
3
Formation, agent and report

3. Mainstay Filing: best for formation, agent and annual report in a single price

$199 a year plus the state fee, $319 due at checkout

Editorial score 8.3 out of 10

Third, Mainstay Filing: one $199 yearly bill covers the Connecticut formation filing, the registered agent and the annual report.

Mainstay files the annual report for you when you renew. Connecticut wants $80 every year, by on or before March 31; Mainstay hands the state's fee through at cost.

Connecticut Registered Agent.co undercuts Mainstay Filing by $200 over three years, and that is why Mainstay sits lower on cost.

In the price

  • Your LLC formation, handled
  • Registered agent service for the full year
  • Annual report, filed by Mainstay
  • EIN application handled

Strengths

  • EIN application comes with the package
  • One $199 yearly price that takes in the annual report
  • $199 on renewal, nothing extra
  • Connecticut's fee passes through at cost

Cons

  • Its agent renews at $100 a year more than Connecticut Registered Agent.co
Visit Mainstay FilingPartner link. We may earn money if you buy. Mainstay Filing up close

The desk's 3 picks in brief

Pick Service Desk score Service fee Year two Good for Visit
1 Connecticut Registered Agent.co 9.1 $199 $99/yr A Connecticut-only LLC on a shoestring Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy.
2 CT Registered Agent.org 8.6 $199 $99/yr A Connecticut-only LLC on a shoestring Visit CT Registered Agent.orgPartner link. We may earn money if you buy.
3 Mainstay Filing 8.3 $199 $199/yr Formation, agent and annual report in a single price Visit Mainstay FilingPartner link. We may earn money if you buy.

A score out of 10 here is editorial judgment built on the criteria explained on How we rank, not an average of customer ratings.

What a Connecticut LLC service costs in 2026: year one, renewal and the three-year bill

Service Year one Year two Year three Bill over three years Annual report filed on your behalf
Connecticut Registered Agent.co $199 $99 $99 $397 No
CT Registered Agent.org $199 $99 $99 $397 No
Mainstay Filing $199 $199 $199 $597 Yes

Every price here was read off the company's own pages on November 12, 2026. Connecticut's $120 filing fee comes on top of every row and is left out of these totals.

Behind the order

Here is the weighting: 33% for spend over three years, 33% for work the price removes, 34% spread over what renewal looks like, fit with the state and plain price display. In Connecticut, spend over three years made the call.

Connecticut Registered Agent.co comes to $397 over three years, $200 less than Mainstay Filing. Mainstay would file the annual report too, but an owner can do that alone for just the state fee, so the lower price won.

The full criteria and weights are on How we rank.

Connecticut LLC filing fee and form: the official numbers

It takes $120 to file the Certificate of Organization with the Connecticut Secretary of State. Every service here adds that fee at cost on top of its own price.

How long the state takes: Most online filings automatically accepted.

After you form: keeping the Connecticut LLC in order

Send in the annual report every year, by on or before March 31. It costs $80. Every LLC must name a registered agent with an in-state street address.

Connecticut LLC service: reader questions

What will setting up an LLC in Connecticut cost you?

$120 goes to the state and $199 to the service.

What do you file to create the LLC?

The Certificate of Organization, sent to the Connecticut Secretary of State.

How fast does Connecticut turn a new LLC around?

The state says: Most online filings automatically accepted.

Does a Connecticut LLC have to line up a registered agent on day one?

Yes. Connecticut expects a registered agent from the start, with a street address inside the state.

What keeps coming due once a Connecticut LLC exists?

One filing: the annual report, every year, due on or before March 31, costing $80.

Does the service price take care of the EIN?

Mainstay Filing builds it into the yearly price. Connecticut Registered Agent.co and CT Registered Agent.org tack on $99. The IRS never charges for an EIN.

Who is our pick for an LLC service in Connecticut?

Connecticut Registered Agent.co, since $199 to form, state fee extra, then $99 a year for the agent.

More from us

Where the numbers came from

  1. Connecticut Secretary of the State, Business Services Division, last checked August 2026
  2. Connecticut Secretary of the State, Business Services Division, last checked August 2026
  3. Connecticut yearly filing: Annual report: fee, official source, last checked October 2026
  4. Connecticut report due date, last checked August 2026
  5. Connecticut formation fee: Filing fee, official source, last checked October 2026
  6. Connecticut formation fee: Filing fee, official source, last checked October 2026
  7. Processing and expedite, official source, last checked October 2026
  8. Connecticut Registered Agent.co: pricing and service pages, as of November 12, 2026
  9. CT Registered Agent.org: pricing and service pages, as of November 12, 2026
  10. Mainstay Filing: Connecticut service page, as of November 12, 2026