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Biz Formation Academy

A plain textbook on LLC paperwork, one state per chapter.

Chapter 1 · Connecticut

Connecticut LLC Formation Chapter (2026): 7 Sections and the 3 Best LLC Services

For forming an LLC in Connecticut in 2026, this chapter recommends Mainstay Filing ($199), Connecticut Registered Agent.co ($199) and CT Registered Agent.org ($199), ranked from first to last. Formation in Connecticut comes to 7 sections and a $120 state fee, plus $80 for the annual report.
Written by the Biz Formation Academy editorial board

Key points

Fee paid to the state to file $120 Source text at business.ct.gov, October 2026
Annual report $80 a year Date due: on or before March 31
Three-year state cost $280 Formation, reports and any minimum tax
Sections in this chapter 7 First to last

You will be able to explain

  • What Connecticut charges to form an LLC and where the filing goes
  • How to satisfy the registered agent rule
  • Recurring obligations
  • How the recommended services compare

Connecticut: the ranked services

Ranked by the grading page: three-year cost (34%), paperwork completed (30%), second-year price, fit with Connecticut rules and clarity of the price list.

1. Mainstay Filing: best for one bill for filing and upkeep

Highest ranked
$199 annually and the $120 state fee

In Connecticut, Mainstay Filing heads the list: one annual payment, $199, completes the filing, the registered agent and the annual report; renewal is $199.

Three years cost $200 more than Connecticut Registered Agent.co, yet this service completes more of the paperwork, and the ranking weighs that.

The annual report is part of the service, and Connecticut's $80 fee is billed at cost.

Price covers

  • Filing delivered to the state
  • Registered agent for the full year
  • Annual report prepared and filed
  • The EIN application is part of the price
  • No markup on the state fee

Advantages

  • Renews at $199
  • The EIN application is filed for you
  • A flat $199 each year

Limitations

  • After year one it costs $100 more annually
Visit Mainstay Filing Partner link. We may earn money if you buy.

2. Connecticut Registered Agent.co: best for a small first payment

Connecticut specialist
$199 in year one, $99 afterward

Second place is held by Connecticut Registered Agent.co, since $199 to start with the first agent year paid, followed by $99 annually.

The annual report remains the owner's task every year.

Price covers

  • The filing is made for you
  • One year of agent service is built into the price

Advantages

  • A modest $99 renewal
  • $199 plus the state fee
  • The first agent year is free

Limitations

  • The annual report remains the owner's responsibility
  • The EIN application is not included ($99)
Visit Connecticut Registered Agent.co Partner link. We may earn money if you buy.

3. CT Registered Agent.org: best for a local filer

Connecticut specialist
$199 in year one, $99 afterward

Third place is held by CT Registered Agent.org, since $199 to start with the first agent year paid, followed by $99 annually.

The annual report remains the owner's task every year.

Connecticut Registered Agent.co and this service cost the same.

Price covers

  • The filing is made for you
  • One year of agent service is built into the price

Advantages

  • A modest $99 renewal
  • The first agent year is free
  • $199 plus the state fee

Limitations

  • The annual report remains the owner's responsibility
  • The EIN application is not included ($99)
Visit CT Registered Agent.org Partner link. We may earn money if you buy.

The Connecticut rankings compared

#ServiceFirst yearFrom year twoThree-year total
1 Mainstay Filing $199$199/yr$597 Visit Mainstay Filing Partner link. We may earn money if you buy.
2 Connecticut Registered Agent.co $199$99/yr$397 Visit Connecticut Registered Agent.co Partner link. We may earn money if you buy.
3 CT Registered Agent.org $199$99/yr$397 Visit CT Registered Agent.org Partner link. We may earn money if you buy.

Listed prices, consulted November 13, 2026. No row includes the $120 state fee.

Formation in sequence

  1. Section 1

    Select and check the company name

    The records at the Connecticut Secretary of State show every name in use. Look yours up before preparing any forms, because Connecticut can refuse a duplicate.

    Write down an alternate name in case the first is taken.

  2. Section 2

    Name your 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.

    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.

    Providing the registered agent is part of what each recommended service sells.

    Reference: Source text at cga.ct.gov, October 2026

  3. Section 3

    Who prepares the filing

    Filing yourself costs $120. Hiring one of the recommended services adds $199 for preparing the paperwork.

  4. Section 4

    Section four is the Certificate of Organization

    This section is the legal act that creates the company: the Certificate of Organization goes to the Connecticut Secretary of State, accompanied by $120 (Conn. Gen. Stat. § 34-247). Per the state, processing takes Most online filings automatically accepted.

    Reference: Source text at business.ct.gov, October 2026

  5. Section 5

    Obtain an EIN

    Approval comes first and the IRS number second. With Mainstay Filing this section is completed for you.

  6. Section 6

    Draft the members' agreement

    Definition: the operating agreement sets out shares, voting and what happens when a member leaves. It is private.

  7. Section 7

    Prepare for the second year

    Calendar entry for the owner: the annual report, at $80, every year, due on or before March 31.

    Reference: Source text at business.ct.gov, October 2026

What each section costs in Connecticut

ItemGoes toCost
Forming the LLC State agency$120
Annual report State agency$80 every year
Optional service The service$199 at the start
State fees for the first three years State agency$280

Anything paid to Connecticut is an official fee that can be verified in the bibliography. The three-year row combines the filing, two later reports and a minimum tax where one exists; service prices are not part of it.

Why the list is in this order

Chapters the price completes accounts for 30% of the ranking, and led on it in Connecticut.

Taking over the annual report tipped the ranking toward the package.

What readers ask

What does Connecticut charge to form an LLC?

Connecticut charges $120. Hiring one of them costs $199 extra.

Which form creates the LLC?

The Certificate of Organization creates the company, and the Connecticut Secretary of State is the recipient.

Is a registered agent required?

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

How long does Connecticut take to process the filing?

Stated processing time: Most online filings automatically accepted.

What does Connecticut require each year?

The recurring obligation is the annual report ($80, every year, due on or before March 31).

Can I form the LLC without a service?

Permitted. File personally for $120 and arrange a registered agent.

Which LLC service should a first-time founder use?

Mainstay Filing, Connecticut Registered Agent.co and CT Registered Agent.org, from the highest ranking to the lowest.

More chapters

Bibliography and primary texts

  1. Bibliography entry for the Connecticut Secretary of the State, Business Services Division chapter: business.ct.gov, consulted August 2026.
  2. Bibliography entry for the Connecticut Secretary of the State, Business Services Division chapter: business.ct.gov, consulted August 2026.
  3. Bibliography entry for the Connecticut yearly filing: Annual report: fee, official source chapter: business.ct.gov, consulted October 2026.
  4. Bibliography entry for the Connecticut report due date chapter: cga.ct.gov, consulted August 2026.
  5. Bibliography entry for the Connecticut formation fee: Filing fee, official source chapter: business.ct.gov, consulted October 2026.
  6. Bibliography entry for the Connecticut formation fee: Filing fee, official source chapter: business.ct.gov, consulted October 2026.
  7. Bibliography entry for the Processing and expedite, official source chapter: business.ct.gov, consulted October 2026.
  8. Prices quoted from the Connecticut service page at Mainstay Filing on November 13, 2026
  9. Prices quoted from the pricing page at Connecticut Registered Agent.co on November 13, 2026
  10. Prices quoted from the pricing page at CT Registered Agent.org on November 13, 2026