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State reply · Connecticut

3 Best LLC Services in Connecticut (2026) and the Facts Behind Them

Best LLC formation services in Connecticut for 2026: Mainstay Filing ($199), Connecticut Registered Agent.co ($199) and CT Registered Agent.org ($199), ranked in that order. Any pick pays the same $120 state filing fee; service fees come to $397 to $597 in three years.

LLC Q and A editorial team ·

At a glance

State filing fee
$120, one time
Then
$80 annually
Registered agent
Yes, the statute demands one
Our pick
Mainstay Filing, Connecticut Registered Agent.co then CT Registered Agent.org

Best in Connecticut, in order

Scoring is explained on the method page.
1Top pick

1. Mainstay Filing: best for handing off upkeep

$199 a year, $120 to the state

#1 in Connecticut: Mainstay Filing, because $199 a year covers three jobs: formation, the registered agent and the annual report.

$200 more than Connecticut Registered Agent.co across three years, in exchange for more filings handled.

You skip the annual report, and pay Connecticut its $80 through the service.

Price covers

  • Formation filed with the state
  • Registered agent for a year
  • Annual report filed
  • EIN application
  • State fees at cost

For

  • Renews at $199
  • $199 a year, all-in
  • No fee for the EIN application

Against

  • $100/yr above Connecticut Registered Agent.co after year one
Go to Mainstay FilingPartner link. We may earn money if you buy.
2Connecticut specialist

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

Form for $199; renew at $99 a year

Connecticut Registered Agent.co ranks second since three years total $397 with its $99 renewal.

The annual report is excluded, so you file it.

Price covers

  • LLC filed for you
  • Agent for year one

For

  • Year-one agent included
  • Formation fee $199
  • Renewal $99

Against

  • Annual report is on your list
  • EIN help: $99 more
Go to Connecticut Registered Agent.coPartner link. We may earn money if you buy.
3Connecticut specialist

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

Form for $199; renew at $99 a year

CT Registered Agent.org ranks third since three years total $397 with its $99 renewal.

The annual report is excluded, so you file it.

Price for price a tie with Connecticut Registered Agent.co.

Price covers

  • LLC filed for you
  • Agent for year one

For

  • Renewal $99
  • Formation fee $199
  • Year-one agent included

Against

  • Annual report is on your list
  • EIN help: $99 more
Go to CT Registered Agent.orgPartner link. We may earn money if you buy.

Comparison

#CompanyYear 1Renewal3-year costCovers
1Mainstay Filing$199$199/yr$597formation filed with the state; registered agent for a year; annual report filedGo to Mainstay FilingPartner link. We may earn money if you buy.
2Connecticut Registered Agent.co$199$99/yr$397LLC filed for you; agent for year oneGo to Connecticut Registered Agent.coPartner link. We may earn money if you buy.
3CT Registered Agent.org$199$99/yr$397LLC filed for you; agent for year oneGo to CT Registered Agent.orgPartner link. We may earn money if you buy.
Prices as of November 13, 2026. State fees are in the checklist below.

Questions and replies

Cost to form an LLC here?

$120 to the state, plus $199 if a service files in year one.

State fees across three years, filing included: $280. business.ct.gov (October 2026) is the source of record

What starts the LLC?

Your filing is the Certificate of Organization, and it is sent to the Connecticut Secretary of State.

Statute: Conn. Gen. Stat. § 34-247. Turnaround: most online filings automatically accepted. business.ct.gov (October 2026) is the source of record

Must the LLC name a registered agent?

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.

cga.ct.gov (October 2026) is the source of record

What is due after formation?

Annual report: every year, $80. For timing, the state's own calendar reads: on or before March 31, so plan ahead of it.

business.ct.gov (October 2026) is the source of record

Is a service required?

Yes. Self-filing costs the state's fees only: $280 over three years.

A service adds $397 to $597 over three years; with Mainstay Filing the reports are in that price.

What decided #1?

Mainstay Filing scores best on chores removed from your list, which is 26% of the total.

62% of the total is three-year price plus chores removed from your list.

Connecticut's annual report is due every year; only the first pick files it.

The five criteria

Connecticut: formation requirements, sourced

ItemDetailSource
LLC filing fee$120business.ct.gov (October 2026) is the source of record
Registered agentYes, the statute demands onecga.ct.gov (October 2026) is the source of record
Annual report$80 every yearbusiness.ct.gov (October 2026) is the source of record
State fees, 3 years$280Sum of the rows above
Rows link to official sources; the final row is our own addition of filing, two reports and any minimum tax.

More replies

How long does the state take?

Most online filings automatically accepted.

Who files the EIN application?

Only Mainstay Filing includes it. Elsewhere: Connecticut Registered Agent.co $99, CT Registered Agent.org $99.

What do the picks cost over three years?

Totals over three years: Mainstay Filing at $597, Connecticut Registered Agent.co at $397, CT Registered Agent.org at $397, before state fees.

Are the fees official?

State fees come from Connecticut's official documents. Service prices come from each company's price page. Both are dated here.

Do I have to hire one?

No law requires a service; it is a paid convenience.

Best LLC service in Connecticut?

Mainstay Filing: $199 a year pays for formation, the registered agent and every annual report, then renews at $199. Behind it: Connecticut Registered Agent.co and CT Registered Agent.org.

Source list

  1. Reference line for Connecticut Secretary of the State, drawn from business.ct.gov and confirmed August 2026, as noted by our editors
  2. Reference line for Connecticut Secretary of the State, drawn from business.ct.gov and confirmed August 2026, as noted by our editors
  3. Reference line for Connecticut yearly filing: Annual report, drawn from business.ct.gov and confirmed October 2026, as noted by our editors
  4. Reference line for Connecticut report due date, drawn from cga.ct.gov and confirmed August 2026, as noted by our editors
  5. Reference line for Connecticut formation fee: Filing fee, drawn from business.ct.gov and confirmed October 2026, as noted by our editors
  6. Reference line for Connecticut formation fee: Filing fee, drawn from business.ct.gov and confirmed October 2026, as noted by our editors
  7. Reference line for Processing and expedite, official source, drawn from business.ct.gov and confirmed October 2026, as noted by our editors
  8. Price page: Mainstay Filing Connecticut service page, accessed November 13, 2026
  9. Price page: Connecticut Registered Agent.co pricing page, accessed November 13, 2026
  10. Price page: CT Registered Agent.org pricing page, accessed November 13, 2026