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Plain answers · Connecticut

3 Best Registered Agents in Connecticut (2026), Plainly Answered

In Connecticut for 2026, we would use Mainstay Filing ($149 a year), CT Registered Agent.org ($99 a year) and Connecticut Registered Agent.co ($99 a year), in that order. The first year costs $99 to $149; three years cost $297 to $447.

By the Plain Charter editorial team ·

Quick answer

Required?
Must have one
Official name
Registered agent
Agent price
$99 to $149 each year
Best picks
Mainstay Filing, CT Registered Agent.org then Connecticut Registered Agent.co

Who we'd hire in Connecticut

Ranked by how we choose: three-year cost first, then what the price covers.
1Our first pick

1. Mainstay Filing: best for owners planning to grow

Costs $149 yearly; renewal $149

Start with Mainstay Filing: its $149 yearly price does not change from state to state.

CT Registered Agent.org saves $150 over three years but works in Connecticut only.

The price covers

  • A street address in the state
  • Three government mailings a year scanned free
  • Covers LLCs, corporations, LPs, LLPs and nonprofits

Upsides

  • Works in every state
  • $149 a year

What to weigh

  • CT Registered Agent.org is $50 a year less
  • Does not file the yearly report
Visit Mainstay FilingPartner link. We may earn money if you buy.
2Connecticut only

2. CT Registered Agent.org: best for a low yearly price

Costs $99 yearly; renewal $99

CT Registered Agent.org comes second: its agent service costs $99 a year with a street address on file.

The price covers

  • An office address in the state
  • Legal papers posted online

Upsides

  • $99 yearly
  • Smaller yearly bill than Mainstay Filing

What to weigh

  • One-state service
  • The annual report stays on your desk
Visit CT Registered Agent.orgPartner link. We may earn money if you buy.
3Connecticut only

3. Connecticut Registered Agent.co: best for local service

Costs $99 yearly; renewal $99

Connecticut Registered Agent.co comes third: its agent service costs $99 a year with a street address on file.

It charges the same as CT Registered Agent.org; the order between them is a close call.

The price covers

  • An office address in the state
  • Legal papers posted online

Upsides

  • $99 yearly
  • Smaller yearly bill than Mainstay Filing

What to weigh

  • One-state service
  • The annual report stays on your desk
Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy.

Prices together

#PickYear 1RenewalThree yearsYou get
1Mainstay Filing$149$149/yr$447A street address in the state; three government mailings a year scanned free; Covers LLCs, corporations, LPs, LLPs and nonprofitsVisit Mainstay FilingPartner link. We may earn money if you buy.
2CT Registered Agent.org$99$99/yr$297an office address in the state; legal papers posted onlineVisit CT Registered Agent.orgPartner link. We may earn money if you buy.
3Connecticut Registered Agent.co$99$99/yr$297an office address in the state; legal papers posted onlineVisit Connecticut Registered Agent.coPartner link. We may earn money if you buy.
Read from company pricing on November 12, 2026; three years means the first year plus two renewals.

What owners ask

Does the law require a registered agent?

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

Under Conn. Gen. Stat. § 34-243n. October 2026 · cga.ct.gov

Who qualifies?

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

Qualify, and you can fill the role yourself for free.

How much per year?

$99 to $149 yearly. Over three years, $297 to $447.

State fees stay the same whichever agent you name.

What will the agent handle?

It gives the LLC an address in Connecticut for legal papers and government mail.

That is why the address must be staffed in business hours. Service of process in plain words

What else comes due each year?

One recurring filing: the annual report ($80, yearly). It falls due on or before March 31.

October 2026 · business.ct.gov

Why this order?

It comes down to what the price takes off your plate, where Mainstay Filing is strongest.

The two biggest criteria are three-year cost and what the price takes off your plate, at 35% and 30%.

CT Registered Agent.org is the smaller bill here, yet it serves Connecticut only.

The criteria in full

Connecticut requirements checklist

RuleAnswerOfficial source
Cost to file$120October 2026 · business.ct.gov
Registered agentMust have oneOctober 2026 · cga.ct.gov
Annual report$80 every yearOctober 2026 · business.ct.gov
Paid to the state by year 3$280Computed from the rows
Three-year state total = filing + reports in years 2 and 3 + any minimum tax; variable costs are not added.

FAQ

Can I be my own agent?

Usually yes: check the two rules above, who qualifies and the address.

Where must the agent be located?

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.

What is the three-year cost of each?

Mainstay Filing $447, CT Registered Agent.org $297 and Connecticut Registered Agent.co $297

Where do you get the fees?

Official Connecticut sources for state fees, company price pages for service fees.

Do I have to use a service?

Not required. Services charge for doing the paperwork for you.

Which registered agent would you pick in Connecticut?

Mainstay Filing first: it costs $149 a year, $149 at renewal, and one account covers any state. CT Registered Agent.org and Connecticut Registered Agent.co follow.

Official sources and prices

  1. August 2026: Connecticut Secretary of the State, business.ct.gov
  2. August 2026: Connecticut Secretary of the State, business.ct.gov
  3. October 2026: Connecticut yearly filing: Annual report, business.ct.gov
  4. August 2026: Connecticut report due date, cga.ct.gov
  5. October 2026: Connecticut formation fee: Filing fee, business.ct.gov
  6. October 2026: Connecticut formation fee: Filing fee, business.ct.gov
  7. Mainstay Filing Connecticut service page (prices on November 12, 2026)
  8. CT Registered Agent.org pricing page (prices on November 12, 2026)
  9. Connecticut Registered Agent.co pricing page (prices on November 12, 2026)