LLC Review Desk's 2026 picks for registered agents in Connecticut, favorite first, are Connecticut Registered Agent.co ($99 a year), CT Registered Agent.org ($99 a year) and Mainstay Filing ($149 a year). Connecticut Registered Agent.co is our favorite, because you pay a flat $99 a year, and papers served on the company are scanned into your account.
By the LLC Review Desk editorial team
Position 1
Our top pick in Connecticut
1. Connecticut Registered Agent.co: best for the smallest yearly price on this list
$99 a year, the same each year
Our score
9.1out of 10
9.1 out of 10
Our favorite is Connecticut Registered Agent.co, because it's $99 a year, and the price stays put at renewal, the smallest yearly price among these picks.
Connecticut Registered Agent.co takes care of the registered office with a street address in the state and scans everything served there.
Over three years it costs less than Mainstay Filing, and cost is one of our two biggest criteria.
In the price
An in-state address on the public record
Every legal paper served on the company is scanned and stored in your account
What we like
Costs less a year than Mainstay Filing
LLC formation with year-one agent service included
$99 a year, and it stays the same at renewal
Trade-offs
The annual report is a job that stays with you
Built for Connecticut; other states need another agent
In third place is Mainstay Filing, because you pay $149 a year whether you stay in one state or grow, and your first three government letters each year are scanned free.
Starting from scratch? The $199 yearly package adds the Connecticut filing and the annual report.
Connecticut Registered Agent.co is $150 cheaper over three years, so Mainstay Filing comes second on cost.
In the price
A registered office street address wherever you need one
No-charge scans of served papers on the day they arrive
Free scans of your first three government letters each year
Compliance reminders
What we like
Fine for LLCs, corporations, LPs, LLPs and nonprofits
Your first three government letters each year, scanned for free
$149 a year and it stays flat
Same-business-day scans of papers served on the company, no charge
Trade-offs
The agent plan alone is $50 a year more than Connecticut Registered Agent.co
Report filing comes with the formation package, not the agent plan
Every score out of 10 is our editors' call, made with the weighted criteria on How we rank, not a customer rating.
What Connecticut registered agents cost in 2026: year one, renewals and three years
Service
First year
Second year
Third year
Three-year total
Same price when you renew
Connecticut Registered Agent.co
$99
$99
$99
$297
Yes
CT Registered Agent.org
$99
$99
$99
$297
Yes
Mainstay Filing
$149
$149
$149
$447
Yes
We took each price from the company's own pages on November 12, 2026. Connecticut's own fees stay the same no matter which agent you choose.
How the order came together
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.
Connecticut Registered Agent.co comes to $297 over three years, which is $150 less than Mainstay Filing. If you only need an agent in Connecticut, fifty-state reach doesn't help much, so the lower yearly price won.
You can read every criterion and weight on How we rank.
What Connecticut says about the registered agent (via Connecticut Secretary of State)
Every LLC must name a registered agent with an in-state street address. The address has to be a Connecticut street address that is not a P.O. box, plus a Connecticut mailing address, which can be a P.O. box. The law: Conn. Gen. Stat. § 34-243n.
The Connecticut annual report: when and how much
Here's the schedule: the annual report is due every year in Connecticut, by on or before March 31. It costs $80. Reminders from the state go to your registered agent.
Your questions about Connecticut registered agents
Do I really need a registered agent for a Connecticut LLC?
You do. Connecticut won't accept an LLC without a registered agent who has a street address in the state, and that name goes on the public record.
What do Connecticut registered agents usually cost per year?
Plan on $99 to $149 a year, and each service keeps its price when you renew.
Can I be my own registered agent?
Sometimes, if you meet the state's rules. A Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment.
When do I have to send in the Connecticut annual report?
Mark on or before March 31 on your calendar. The state's charge is $80.
Which registered agents did we review here?
Connecticut Registered Agent.co ($99 a year), CT Registered Agent.org ($99 a year) and Mainstay Filing ($149 a year), with our favorite first.
Who is the best registered agent for Connecticut?
Connecticut Registered Agent.co, because it focuses on Connecticut at $99 a year and gives you an in-state street address for the registered office.