Skip to content
LLC PlainlyThe LLC stuff, in words you actually use.

Straight talk · Connecticut

3 Best LLC Services in Connecticut (2026): Our Honest Take

For LLC formation services in Connecticut, here is our 2026 ranking: Connecticut Registered Agent.co ($199), Mainstay Filing ($199) and CT Registered Agent.org ($199). Plan on $120 for the state plus $397 to $597 in service fees over three years.
From the LLC Plainly editorial team

Quick take

Cost at the state
$120, when you file
Ongoing
$80 a year
Registered agent
Yes, you must
Who we like
Connecticut Registered Agent.co, Mainstay Filing then CT Registered Agent.org

Our Connecticut picks

Prices come from each company's own pricing. Here's how we pick.
Best overall

1. Connecticut Registered Agent.co: best for a small first-year bill

$199 to start and $99 to keep going each year

We'd use Connecticut Registered Agent.co in Connecticut. It starts at $199 with the first agent year included and runs $99 a year after that.

Over three years it costs less than Mainstay Filing, which counts most with us.

Expect to file the annual report on your own.

Your money buys

  • Articles filed on your behalf
  • First-year agent comes with it

The good

  • A free agent year at the start
  • Just $199 to get formed
  • The agent renews at $99

Trade-offs

  • You'll have to remember the annual report on your own
  • The EIN isn't included ($99)
All 50 states

2. Mainstay Filing: best for knowing next year's bill

$199 per year, renewing at $199

Second place goes to Mainstay Filing, where it's the only pick that files the annual report for you, and that's all inside $199 a year.

Connecticut Registered Agent.co is $200 less across three years, which is enough to rank higher.

It files your annual report for you and passes the state's $80 along at cost.

Your money buys

  • Articles prepared and submitted
  • Registered agent the whole year
  • Annual report handled when it comes due
  • We apply for your EIN
  • State fees billed at cost

The good

  • Year two is $199
  • The EIN application is part of the deal
  • A single yearly price of $199

Trade-offs

  • $100 a year more than Connecticut Registered Agent.co once you renew
Connecticut only

3. CT Registered Agent.org: best for a low agent renewal

$199 to start and $99 to keep going each year

CT Registered Agent.org takes third, because it starts at $199 with the first agent year included and runs $99 a year after that.

Expect to file the annual report on your own.

Its prices match Connecticut Registered Agent.co exactly, so either one works.

Your money buys

  • Articles filed on your behalf
  • First-year agent comes with it

The good

  • A free agent year at the start
  • The agent renews at $99
  • Just $199 to get formed

Trade-offs

  • You'll have to remember the annual report on your own
  • The EIN isn't included ($99)

At a glance

#WhoYear oneRenews at3 yearsCovers
1Connecticut Registered Agent.co$199$99/yr$397articles filed on your behalf; First-year agent comes with itSee what Connecticut Registered Agent.co offersPartner link. We may earn money if you buy.
2Mainstay Filing$199$199/yr$597articles prepared and submitted; registered agent the whole year; annual report handled when it comes dueSee what Mainstay Filing offersPartner link. We may earn money if you buy.
3CT Registered Agent.org$199$99/yr$397articles filed on your behalf; First-year agent comes with itSee what CT Registered Agent.org offersPartner link. We may earn money if you buy.
These are service fees only, from each company's prices on November 13, 2026. The state's fees are the same whoever you pick.

Straight answers

How much should I set aside to form it?

Expect the state to take $120, plus $199 for a service in the first year.

Three years of state fees will cost you $280. business.ct.gov · October 2026 · checked

What goes to the state to form the LLC?

Your LLC exists once the Connecticut Secretary of State approves the Certificate of Organization.

Cited law: Conn. Gen. Stat. § 34-247. Processing time: most online filings automatically accepted. business.ct.gov · October 2026 · checked

Do I have to name a registered agent?

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

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

cga.ct.gov · October 2026 · checked

What comes due in later years?

Keep the annual report current. You file it every year for $80. The state lists the due date as on or before March 31, so don't let it slide.

business.ct.gov · October 2026 · checked

Do I have to pay a service at all?

Sure. Skip the service and you'd pay the state $280 over three years.

Services bill $397 to $597 over three years for taking this off your hands.

Why did the first pick win?

Cost across three years, worth 33%, put Connecticut Registered Agent.co first.

Together, cost across three years and work taken off your hands make up 64% of the score.

On cost, Connecticut Registered Agent.co takes it at $397, a saving of $200 against Mainstay Filing.

Read the method

Connecticut rules at a glance

ItemDetailsWhere we found it
Cost to form the LLC$120business.ct.gov · October 2026 · checked
Registered agentYes, you mustcga.ct.gov · October 2026 · checked
Annual report$80 every yearbusiness.ct.gov · October 2026 · checked
Three-year state total$280Rows above, totaled
The bottom row isn't a state figure. It's our total of the filing fee, the next two reports and the minimum tax, if the state has one.

Other things people ask

How fast does the state process this?

Most online filings automatically accepted.

Will they apply for my EIN?

You'd pay $99 at Connecticut Registered Agent.co or $99 at CT Registered Agent.org, and nothing extra at Mainstay Filing.

What's each pick's bill across three years?

Connecticut Registered Agent.co: $397 / Mainstay Filing: $597 / CT Registered Agent.org: $397, not counting state fees.

Can I check these fees?

Official Connecticut sources on the state side and company pricing on the service side, all dated.

Can I just do this myself?

You can skip it. The state's fee is the same whichever way you file.

Which LLC service would you hire in Connecticut?

Connecticut Registered Agent.co wins on cost across three years, ahead of Mainstay Filing and CT Registered Agent.org.

What we used for this page

  1. Connecticut Secretary of the State, business.ct.gov (confirmed August 2026)
  2. Connecticut Secretary of the State, business.ct.gov (confirmed August 2026)
  3. Connecticut yearly filing: Annual report, business.ct.gov (confirmed October 2026)
  4. Connecticut report due date, cga.ct.gov (confirmed August 2026)
  5. Connecticut formation fee: Filing fee, business.ct.gov (confirmed October 2026)
  6. Connecticut formation fee: Filing fee, business.ct.gov (confirmed October 2026)
  7. Processing and expedite, official source, business.ct.gov (confirmed October 2026)
  8. We read the Connecticut Registered Agent.co pricing page on November 13, 2026
  9. We read the Mainstay Filing Connecticut service page on November 13, 2026
  10. We read the CT Registered Agent.org pricing page on November 13, 2026