LLC Review Desk's 2026 picks for LLC services in Connecticut, favorite first, are CT Registered Agent.org ($199), Mainstay Filing ($199) and Connecticut Registered Agent.co ($199). CT Registered Agent.org is our favorite, because the Connecticut formation costs $199 over the state's fee, with the registered agent free the first year, and keeping the agent is $99 a year.
By the LLC Review Desk editorial team
Position 1
Our top pick
1. CT Registered Agent.org: best for a Connecticut LLC that will stay put
$199 to form, then $99 a year for the agent, with the state fee on top
Our score
9.3out of 10
9.3 out of 10
Our favorite is CT Registered Agent.org, because $199 for formation on top of the state fee, then $99 a year for the agent.
You get a street address in the state for your registered office, and any papers served on the company are scanned into your online account.
The annual report isn't part of its published price, so you send it to Connecticut yourself every year.
Over three years it costs less than Mainstay Filing, and cost is one of our two biggest criteria.
2. Mainstay Filing: best for formation, agent and annual report in one simple price
$199 a year, and the state fee goes on top ($319 at checkout)
Our score
8.9out of 10
8.9 out of 10
Coming in second is Mainstay Filing, because for one yearly price of $199 you get the Connecticut filing, registered agent service and the annual report, then $199 at renewal.
When your plan renews, Mainstay files the annual report for you. Connecticut charges $80 every year for it, and the date is on or before March 31. Mainstay passes the state's fee along at cost.
CT Registered Agent.org is $200 cheaper over three years, so Mainstay Filing comes second on cost.
In the price
Formation paperwork prepared and sent in
A full year as your registered agent
Your annual report, prepared and filed for you
Your EIN application, taken care of
What we like
The EIN application is included
Renews at $199, no add-ons
One yearly price of $199 that includes the annual report
Connecticut's fee is passed through at cost
Trade-offs
After year one, its agent costs $100 a year more than CT Registered Agent.org's
Every score out of 10 is our editors' call, made with the weighted criteria on How we rank, not a customer rating.
What Connecticut LLC services cost in 2026: year one, renewals and three years
Service
First year
Second year
Third year
Three-year total
Handles the annual report too
CT Registered Agent.org
$199
$99
$99
$397
No
Mainstay Filing
$199
$199
$199
$597
Yes
Connecticut Registered Agent.co
$199
$99
$99
$397
No
We took each price from the company's own pages on November 12, 2026. On top of every row, Connecticut charges a $120 filing fee, which isn't in these totals.
How we scored these
LLC Review Desk gives three-year cost 29% and filings in the price 29%, then divides 42% among renewal price, state fit and up-front totals. For Connecticut, it came down to three-year cost.
CT Registered Agent.org comes to $397 over three years, which is $200 less than Mainstay Filing. Mainstay would file the annual report too, but you can do it yourself for the state fee, so the lower price won here.
You can read every criterion and weight on How we rank.
The Connecticut LLC filing fee and form, from the state
Heads up: the Connecticut Secretary of State takes $120 when you file the Certificate of Organization. Every service below adds that fee at cost.
How long the state says it takes: Most online filings automatically accepted.
What a Connecticut LLC needs after it is formed
There's one recurring item: the annual report, every year, by on or before March 31. The state asks for $80. Every LLC must name a registered agent with an in-state street address.
Your questions about Connecticut LLC services
How much does forming an LLC in Connecticut set you back?
The state charges $120 to file, and services charge $199.
What paperwork makes the LLC official?
You send the Certificate of Organization to the Connecticut Secretary of State.
Does Connecticut approve LLCs quickly?
The state's own estimate is Most online filings automatically accepted.
Does the Connecticut formation form ask me to name a registered agent?
Yes. You list a registered agent when you file and keep one on record, using a street address in Connecticut.
Is there paperwork after the LLC is formed?
Yes, one item: the annual report. It comes every year, by on or before March 31, and the state asks $80.
Is the EIN included in the price?
With Mainstay Filing, yes; it comes with the yearly price. CT Registered Agent.org and Connecticut Registered Agent.co tack on $99 for it. You can also ask the IRS for an EIN yourself, free of charge.
Who should I use to form my Connecticut LLC?
CT Registered Agent.org, because forming in Connecticut is $199 plus the state fee, and your first year as registered agent is included, then $99 a year.