Connecticut LLC Costs (2026): Official Fees and the 3 Best LLC Services
In 2026 we'd hire CT Registered Agent.org ($199), Mainstay Filing ($199) and Connecticut Registered Agent.co ($199) for forming an LLC in Connecticut, in that order. Connecticut charges $120 to form and $80 for the annual report every year; on our three-year measure it ranks 32nd of 50.
Deadline: on or before March 31. October 2026: business.ct.gov
Three-year state fees
$280
Years one to three, state fees only
Our Connecticut shortlist
Scored on five weighted criteria (methodology). Biggest weights: three-year service fees and filings covered.
Number one
1. CT Registered Agent.org: best for a budget Connecticut LLC
Formation $199, renewal $99 a year
CT Registered Agent.org is where we'd go first: the Connecticut filing for $199 and a free first agent year, then $99 yearly for the agent.
It beats Mainstay Filing on three-year cost, which is the biggest single weight in our method.
The annual report is not part of its price.
What you pay for
Connecticut formation prepared and filed
First year of agent service
For
Year one of agent service in the price
$99 yearly from year two
$199 + state fee
Against
Annual report left to you
EIN application not included ($99)
Widest coverage
2. Mainstay Filing: best for a single yearly bill
$199 a year, renewing at $199
Mainstay Filing slots in second. What it offers: its $199 yearly price takes care of the Connecticut filing, the registered agent and the annual report, and it renews at $199.
On three-year service fees it trails CT Registered Agent.org by $200.
Renewals include the annual report filing (state fee $80, billed at cost).
What you pay for
Formation prepared and filed
Registered agent, all year
Annual report prepared and filed
EIN application
State fee at cost, no markup
For
$199 a year covers formation and agent and report
Same $199 at renewal
EIN application at no extra charge
Against
Renews $100 above CT Registered Agent.org
Local option
3. Connecticut Registered Agent.co: best for local formation
Formation $199, renewal $99 a year
Connecticut Registered Agent.co slots in third. What it offers: the Connecticut filing for $199 and a free first agent year, then $99 yearly for the agent.
To form the LLC you file the Certificate of Organization with the Connecticut Secretary of State and pay $120. No service on this page marks it up. Processing time: Most online filings automatically accepted.
Annual report: what it costs
Each year the LLC files the annual report and pays $80; the deadline is on or before March 31.
The reasoning
Service fees over three years is worth 35% of the score, and it put CT Registered Agent.org ahead of Mainstay Filing here.
CT Registered Agent.org totals $397 over three years, $200 less than Mainstay Filing.
FAQ
How much does it cost to start an LLC in Connecticut?
$120 to the state. Add $199 if a service files it.
How much is the Connecticut annual report?
$80, every year, due on or before March 31.
Where does Connecticut rank on LLC costs?
32nd of 50 on three-year state fees, at $280, counting from the least expensive state.
How long does approval take?
Usual processing: Most online filings automatically accepted.
Is a registered agent required?
Every LLC must name a registered agent with an in-state street address.
Which LLC service would you use?
We'd use CT Registered Agent.org: a $199 formation fee and a $99 yearly agent renewal. Mainstay Filing and Connecticut Registered Agent.co follow.