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Plain CharterLLC questions, short answers.

Short answers · Connecticut

3 Best LLC Services in Connecticut (2026), Plainly Answered

We'd pick Mainstay Filing ($199), CT Registered Agent.org ($199) and Connecticut Registered Agent.co ($199) in Connecticut for 2026, in that order. Count on $120 for the filing itself and $397 to $597 in service fees over three years.

By the Plain Charter editorial team ·

Quick answer

Fee to form
$120, at filing
Ongoing state fees
$80 a year
Registered agent
Must have one
Who we'd use
Mainstay Filing, CT Registered Agent.org then Connecticut Registered Agent.co

Who to use in Connecticut

Prices come from each company's own pricing. How we choose.
1Best overall

1. Mainstay Filing: best for having the annual report filed for you

Annual price $199, renewal price $199, state fee extra

First choice: Mainstay Filing. The reason is simple: the annual report is part of its $199 yearly price, along with formation and the registered agent.

The extra $200 over three years, compared with CT Registered Agent.org, pays for work you would otherwise do yourself.

You never file the annual report yourself; only the state's $80 is added.

The price covers

  • State filing handled
  • Registered agent every month of the year
  • Annual report filed on time for you
  • EIN request filed
  • Official fee, no markup

Upsides

  • Renews at $199
  • Handles the EIN application
  • One yearly price of $199

What to weigh

  • A $100 yearly premium over CT Registered Agent.org
Visit Mainstay FilingPartner link. We may earn money if you buy.
2Connecticut only

2. CT Registered Agent.org: best for a low three-year cost

$199 plus the state fee, then $99 a year

CT Registered Agent.org is next: it costs $199 up front with the first agent year, then $99 each year after.

Budget time for the annual report; it is not included.

The price covers

  • State filing handled
  • A year of agent service

Upsides

  • No agent fee in year one
  • Low $99 renewal
  • $199 plus the state fee

What to weigh

  • No help with the annual report
  • $99 add-on for the EIN
Visit CT Registered Agent.orgPartner link. We may earn money if you buy.
3Connecticut only

3. Connecticut Registered Agent.co: best for owners who file their own reports

$199 plus the state fee, then $99 a year

Connecticut Registered Agent.co is next: it costs $199 up front with the first agent year, then $99 each year after.

Budget time for the annual report; it is not included.

Price for price it ties CT Registered Agent.org.

The price covers

  • State filing handled
  • A year of agent service

Upsides

  • $199 plus the state fee
  • Low $99 renewal
  • No agent fee in year one

What to weigh

  • No help with the annual report
  • $99 add-on for the EIN
Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy.

Compare at a glance

#CompanyFirst-year priceRenewalBy year threeIncludes
1Mainstay Filing$199$199/yr$597state filing handled; registered agent every month of the year; annual report filed on time for youVisit Mainstay FilingPartner link. We may earn money if you buy.
2CT Registered Agent.org$199$99/yr$397state filing handled; A year of agent serviceVisit CT Registered Agent.orgPartner link. We may earn money if you buy.
3Connecticut Registered Agent.co$199$99/yr$397state filing handled; A year of agent serviceVisit 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.

The plain answers

What does it cost to form an LLC here?

Filing yourself costs $120. With a service, add $199.

Three years of state fees, from filing onward, come to $280. October 2026 · business.ct.gov

Who receives the filing?

The Connecticut Secretary of State accepts the Certificate of Organization, and that filing creates the LLC.

Statute: Conn. Gen. Stat. § 34-247. How long the state takes: most online filings automatically accepted. October 2026 · business.ct.gov

Does the law require 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.

October 2026 · cga.ct.gov

What do I owe each year after that?

Mainly the annual report, once a year. Fee: $80. Deadline: on or before March 31.

October 2026 · business.ct.gov

Can I do it without a service?

You can. Without a service you pay just the state: $280 across three years.

The trade-off is $397 to $597 over three years against doing every form yourself.

Why this order?

What the price takes off your plate (30% of our weighting) put Mainstay Filing first.

Three-year cost counts for 35% and what the price takes off your plate for 30%; the other three criteria are smaller.

CT Registered Agent.org is the lower bill, but the annual report stays your job there.

How we choose

Connecticut requirements checklist

ItemAnswerFrom
Fee to form$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$280Total of these fees
Three-year state total = filing + reports in years 2 and 3 + any minimum tax; variable costs are not added.

FAQ

What is the processing time?

Most online filings automatically accepted.

Who handles the EIN?

EIN help costs $99 with CT Registered Agent.org or $99 with Connecticut Registered Agent.co, and nothing extra with Mainstay Filing.

How do the three-year costs compare?

Mainstay Filing $597, CT Registered Agent.org $397 and Connecticut Registered Agent.co $397 in service fees.

Are the fees official?

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

Does the state require a service?

No. The state accepts filings from owners; a service saves time and handles the agent role.

What is the best LLC service for Connecticut?

We rank Mainstay Filing first on what the price takes off your plate, with CT Registered Agent.org and Connecticut Registered Agent.co behind it.

Where these answers come from

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