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LLC UnpackedEvery filing, unpacked: the fee, the form, the catch.

Open it up · Connecticut

3 Best Registered Agents in Connecticut (2026): Unpacked

In Connecticut for 2026, unpack registered agents in this order: CT Registered Agent.org ($99 a year), Mainstay Filing ($149 a year) and Connecticut Registered Agent.co ($99 a year). An agent opens at $99 to $149 in the first year and totals $297 to $447 by year three.
Unpacked by the LLC Unpacked editorial team

Top layer

Required to name one?
Yes, by law
Label in the statute
Registered agent
What agents charge
$99 to $149 per year
Our pick
CT Registered Agent.org, Mainstay Filing then Connecticut Registered Agent.co

Our Connecticut picks, opened up

The order follows our five layers: three-year cost first, then what the price covers.
Top of the stack

1. CT Registered Agent.org: best for an LLC that stays in the state

$99 a year, then $99 at renewal

CT Registered Agent.org sits on top in Connecticut because three years for a Connecticut-only company come to $297.

Three years cost less here than at Mainstay Filing, and cost counts most in our weighing.

Inside the price

  • An in-state street address
  • Scans of legal papers online

Inside, the good

  • $99 a year, flat at renewal
  • Costs less a year than Mainstay Filing

Inside, the catch

  • Connecticut only
  • You carry the annual report yourself
All fifty states

2. Mainstay Filing: best for one price in every state

$149 a year, then $149 at renewal

Mainstay Filing lands second, and $149 a year moves with the company into a new state.

Why not higher? Three years cost $150 more than CT Registered Agent.org, and cost is the heaviest layer.

Inside the price

  • A street address inside the state
  • Three government mailings a year, scanned for free
  • Also covers corporations, LPs, LLPs and nonprofits

Inside, the good

  • One price in all fifty states
  • Annual price $149, renewal price $149

Inside, the catch

  • CT Registered Agent.org charges $50 less each year
  • The yearly report stays with you
Connecticut only

3. Connecticut Registered Agent.co: best for another in-state option

$99 a year, then $99 at renewal

What puts Connecticut Registered Agent.co third: three years for a Connecticut-only company come to $297.

It charges what CT Registered Agent.org charges.

Inside the price

  • An in-state street address
  • Scans of legal papers online

Inside, the good

  • Costs less a year than Mainstay Filing
  • $99 a year, flat at renewal

Inside, the catch

  • Connecticut only
  • You carry the annual report yourself

Side by side

#PickOpening priceRenewalTotal, 3 yearsWhat is inside
1CT Registered Agent.org$99$99/yr$297An in-state street address; scans of legal papers onlineOpen CT Registered Agent.orgPartner link. We may earn money if you buy.
2Mainstay Filing$149$149/yr$447A street address inside the state; three government mailings a year, scanned for free; Also covers corporations, LPs, LLPs and nonprofitsOpen Mainstay FilingPartner link. We may earn money if you buy.
3Connecticut Registered Agent.co$99$99/yr$297An in-state street address; scans of legal papers onlineOpen Connecticut Registered Agent.coPartner link. We may earn money if you buy.
Prices as of November 13, 2026. The state's own fees are in the checklist below.

Opened up, question by question

Is a registered agent required?

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

Statute: Conn. Gen. Stat. § 34-243n. peek at cga.ct.gov, confirmed October 2026

Who qualifies?

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

If you qualify, you can serve yourself at no cost.

What is inside an agent's price?

$99 to $149 annually, $297 to $447 in total across three years.

No state fee depends on the agent you name.

Why does the state want an agent?

Whatever legal paper is meant for the LLC in Connecticut goes to the agent, who passes it along.

What matters is that nothing important sits unnoticed while you are away. Service of process, unpacked

What does the LLC owe the state each year?

Underneath it all, one filing repeats: the annual report, every year, at $80 each time. The state phrases its deadline like this: on or before March 31.

peek at business.ct.gov, confirmed October 2026

Why is the stack in this order?

On total across three years (34%), CT Registered Agent.org comes out ahead.

Five layers set the order: total across three years (34%), what is inside the price (29%), price laid out in the open (14%), how the renewal behaves (12%) and how far it reaches (11%).

CT Registered Agent.org stacks up to $297 over three years, $150 under Mainstay Filing.

How we open it up

What Connecticut requires of an agent

PartWhat is insideOfficial source
LLC filing fee$120peek at business.ct.gov, confirmed October 2026
Registered agentYes, by lawpeek at cga.ct.gov, confirmed October 2026
Annual report$80 every yearpeek at business.ct.gov, confirmed October 2026
State fees, years one to three$280The rows above, stacked
To check the total yourself, add the filing fee, the next two reports and any minimum tax. Costs without a set amount are left out.

Also worth asking

May an owner serve as agent?

Yes, if you meet the state's rules on who may serve and on the address, both shown above.

Which addresses does the state accept?

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.

How do the three-year totals compare?

CT Registered Agent.org stacks up to $297, Mainstay Filing stacks up to $447, Connecticut Registered Agent.co stacks up to $297

What do these numbers rest on?

Official Connecticut paperwork stands behind every state fee here, and every service price traces back to the company's own pricing.

Does the law require one?

No law requires a service. It is a paid convenience.

What is the best registered agent for Connecticut?

CT Registered Agent.org, because $99 a year, then $99, fits an LLC that stays in Connecticut. Then Mainstay Filing and Connecticut Registered Agent.co.

What the page rests on

  1. Unpacking Connecticut Secretary of the State led us to business.ct.gov, confirmed August 2026, which you can open yourself
  2. Unpacking Connecticut Secretary of the State led us to business.ct.gov, confirmed August 2026, which you can open yourself
  3. Unpacking Connecticut yearly filing: Annual report led us to business.ct.gov, confirmed October 2026, which you can open yourself
  4. Unpacking Connecticut report due date led us to cga.ct.gov, confirmed August 2026, which you can open yourself
  5. Unpacking Connecticut formation fee: Filing fee led us to business.ct.gov, confirmed October 2026, which you can open yourself
  6. Unpacking Connecticut formation fee: Filing fee led us to business.ct.gov, confirmed October 2026, which you can open yourself
  7. CT Registered Agent.org pricing page, read November 13, 2026
  8. Mainstay Filing Connecticut service page, read November 13, 2026
  9. Connecticut Registered Agent.co pricing page, read November 13, 2026