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3 Best LLC Services in Connecticut (2026), Step by Step

In Connecticut for 2026, compare Connecticut Registered Agent.co ($199), Mainstay Filing ($199) and CT Registered Agent.org ($199), ranked best first. Every option pays the same $120 filing fee, and three years of service cost $397 to $597.
Written by the Simple Filing Guide editorial team

Quick guide

Cost to file
$120, at filing
What comes next
$80 per year
Registered agent
Yes, by law
Where to start
Connecticut Registered Agent.co, Mainstay Filing then CT Registered Agent.org

Where to start in Connecticut

Prices come from each company's own page. Read how we rank for the method.

#1 Start here

1. Connecticut Registered Agent.co: best for a one-state LLC

$199 at the start, then $99 yearly

Start with Connecticut Registered Agent.co in Connecticut: the opening price is $199 with the first agent year included, then $99 annually.

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

The annual report is excluded from the price.

Checklist: what is included
  • Formation handled
  • A year of agent service to start
What works
  • A modest renewal of $99
  • A free agent year at the start
  • $199 to get started
Gaps
  • Not included: the annual report
  • The EIN application costs $99 more
Visit Connecticut Registered Agent.co to begin Partner link. We may earn money if you buy.
#2 Nationwide

2. Mainstay Filing: best for staying out of the paperwork

$199 a year, with the $120 state fee added

Mainstay Filing is second, because $199 a year gets the formation, the registered agent and the annual report done.

A $200 three-year difference to Connecticut Registered Agent.co explains the lower rank.

You skip the annual report; Connecticut still charges $80, billed to you at cost.

Checklist: what is included
  • The formation filing, done
  • Registered agent all year
  • Annual report looked after for you
  • Help with your EIN
  • No markup on state fees
What works
  • Single yearly fee: $199
  • No extra fee to get your EIN
  • No jump at renewal ($199)
Gaps
  • A $100 annual premium compared with Connecticut Registered Agent.co
Visit Mainstay Filing to begin Partner link. We may earn money if you buy.
#3 Connecticut only

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

$199 at the start, then $99 yearly

Next, consider CT Registered Agent.org: the opening price is $199 with the first agent year included, then $99 annually.

The annual report is excluded from the price.

It charges the same as Connecticut Registered Agent.co, so the order between them is a close call.

Checklist: what is included
  • Formation handled
  • A year of agent service to start
What works
  • $199 to get started
  • A free agent year at the start
  • A modest renewal of $99
Gaps
  • Not included: the annual report
  • The EIN application costs $99 more
Visit CT Registered Agent.org to begin Partner link. We may earn money if you buy.

Compare the picks

#CompanyStartYearly afterTotal for 3 yearsWhat is covered
1 Connecticut Registered Agent.co $199$99/yr$397formation handled; A year of agent service to start Visit Connecticut Registered Agent.co to begin Partner link. We may earn money if you buy.
2 Mainstay Filing $199$199/yr$597the formation filing, done; registered agent all year; annual report looked after for you Visit Mainstay Filing to begin Partner link. We may earn money if you buy.
3 CT Registered Agent.org $199$99/yr$397formation handled; A year of agent service to start Visit CT Registered Agent.org to begin Partner link. We may earn money if you buy.

Prices as of November 13, 2026; the state's own fees are listed in the checklist below.

What to know before you file

How much money do I need to set aside?

$120 goes to the state, and a service adds $199.

By the end of year three, you will have paid the state $280. verify at business.ct.gov, as of October 2026

What exactly do I submit?

File the Certificate of Organization with the Connecticut Secretary of State; that single filing creates the LLC.

Check the law: Conn. Gen. Stat. § 34-247. How long the state takes: most online filings automatically accepted. verify at business.ct.gov, as of October 2026

Is naming a registered agent a legal duty?

Every LLC must name a registered agent with an in-state street address.

A Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment.

verify at cga.ct.gov, as of October 2026

What keeps the LLC in good standing?

Set aside $80 each year for the annual report. Write down the state's date, on or before March 31.

verify at business.ct.gov, as of October 2026

Can I file it myself instead of hiring a service?

Yes, you can. On your own, the three-year bill is just the state's fees: $280.

Expect to pay $397 to $597 over three years if you hire.

What put the first pick on top?

Total for three years, at 37%, puts Connecticut Registered Agent.co first.

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%).

Choose Connecticut Registered Agent.co over Mainstay Filing and keep $200 across three years.

Our method in full

Connecticut checklist, with sources

StepWhat to knowOfficial source
Fee to file the LLC $120verify at business.ct.gov, as of October 2026
Registered agent Yes, by lawverify at cga.ct.gov, as of October 2026
Annual report $80 every yearverify at business.ct.gov, as of October 2026
What the state collects in three years $280Rows above, added up

Add the filing fee, the reports for years two and three and any minimum tax to reproduce the last row. Costs with no set amount, such as a newspaper notice, are left out.

Also asked

How long until the LLC exists?

Most online filings automatically accepted.

Do they apply for the EIN?

Budget $99 for Connecticut Registered Agent.co or $99 for CT Registered Agent.org to get an EIN, and nothing extra at Mainstay Filing.

What do the picks cost over three years?

$397 for Connecticut Registered Agent.co, $597 for Mainstay Filing, $397 for CT Registered Agent.org, with state fees on top.

Where do you get the fees?

Official Connecticut documents supply the state fees, and the companies' own pricing pages supply the service fees. Both carry dates on this page.

Do I need to hire a service?

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

Who is your first choice in Connecticut?

Connecticut Registered Agent.co leads on total for three years, ahead of Mainstay Filing and CT Registered Agent.org.

References

  1. August 2026 check of Connecticut Secretary of the State, via business.ct.gov
  2. August 2026 check of Connecticut Secretary of the State, via business.ct.gov
  3. October 2026 check of Connecticut yearly filing: Annual report, via business.ct.gov
  4. August 2026 check of Connecticut report due date, via cga.ct.gov
  5. October 2026 check of Connecticut formation fee: Filing fee, via business.ct.gov
  6. October 2026 check of Connecticut formation fee: Filing fee, via business.ct.gov
  7. October 2026 check of Processing and expedite, official source, via business.ct.gov
  8. Pricing from the Connecticut Registered Agent.co pricing page, November 13, 2026
  9. Pricing from the Mainstay Filing Connecticut service page, November 13, 2026
  10. Pricing from the CT Registered Agent.org pricing page, November 13, 2026