LLC Filing Guide › Connecticut
How to file an LLC in Connecticut (2026)
File the Certificate of Organization with the Connecticut Secretary of State to create a Connecticut LLC. The filing fee is $120. Connecticut LLCs file an Annual Report every year, due on or before March 31, for $80. Every Connecticut LLC must keep a registered agent with a Connecticut street address.
- Official sources, checked October 20, 2026
- Prices verified October 2026
How to form an LLC in Connecticut
- Pick a name with “LLC” or “Limited Liability Company” in it, and check that it’s free on the Connecticut Secretary of State business records.
- Name a registered agent: a Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment.
- File the Certificate of Organization with the Connecticut Secretary of State and pay $120.
- Get an EIN from the IRS. It is free and comes after the LLC is formed.
- Sign an operating agreement among the members. It sets ownership and voting rules and stays with your records.
- File the yearly report. Connecticut LLCs file an Annual Report every year, due on or before March 31, for $80.
Mainstay Filing takes care of the agent, the filing, the EIN application and each annual report for $199 a year plus Connecticut’s fees.
Connecticut LLC fees and rules
- State filing fee
- $120
- Formation document
- Certificate of Organization
- Filed with
- Connecticut Secretary of State
- Yearly filing
- Annual Report, every year, $80
- Due
- On or before March 31
- Registered agent
- Required. A Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment.
- Agent address
- 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.
- Filing fee rank
- 30th lowest of 50 (29 states charge less, 20 charge more)
Connecticut compared with neighboring states
| State | Filing fee | Yearly filing |
|---|---|---|
| Connecticut | $120 | $80 / yr |
| Massachusetts | $500 | $500 / yr |
| New York | $200 | $9 / 2 yrs |
| Rhode Island | $150 | $50 / yr |
Mainstay Filing
$199 / year, all-in, plus state fees
$199 a year plus Connecticut’s $120 filing fee, which is passed through at cost.
- LLC formation, prepared and filed
- Registered agent, all year
- EIN application (with an SSN or ITIN)
- Annual report, prepared and filed every year it’s due
- Compliance reminders
The same $199 at renewal. Already have an LLC and only need an agent? Mainstay Filing’s registered agent service alone is $149 a year.
Prices verified October 21, 2026 on Mainstay Filing’s pricing and FAQ pages.
Connecticut LLC questions
How much does it cost to start an LLC in Connecticut?
$120 to the state to file. Connecticut LLCs file an Annual Report every year, due on or before March 31, for $80. With Mainstay Filing, the formation filing, registered agent, EIN application and annual reports are $199 a year on top of the state fees.
Does Connecticut require an annual report for LLCs?
Yes. Connecticut LLCs file an Annual Report every year, due on or before March 31, for $80.
Do I need a registered agent in Connecticut?
Yes. A Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment.
Can I form a Connecticut LLC myself?
Yes. You can file the Certificate of Organization directly with the Connecticut Secretary of State and pay the $120 fee. A service such as Mainstay Filing files it for you and adds the registered agent, EIN application and annual reports for $199 a year.
Other formation services
- Northwest Registered Agent: $39 plus the state fee, with its registered agent service included the first year, then $125 a year; annual report filing is an extra $100 plus the state fee.
- ZenBusiness: Starter package $0 plus the state fee; Pro is $199 a year with the EIN and annual-report filing, and its registered agent is a separate $199 a year that no package includes.
- Bizee: Basic package $0 plus the state fee (Standard $199, Premium $299), with one free year of its registered agent, which is $149 a year after that.
- LegalZoom: Basic package $0 plus the state fee (Pro $249, Premium $299); its registered agent is $249 a year for first-time agent customers.
Prices from each company’s own pages, checked October 20, 2026. Plus the state fee in every case.
Sources
- Conn. Gen. Stat. § 34-247 (Formation of limited liability company; certificate of organization); fee set by § 34-243u(a)(3) (multira state research spine): www.cga.ct.gov/current/pub/chap_613a.htm, checked August 12, 2026
- Connecticut formation fee: Filing fee, official source read 2026-10-01: business.ct.gov/knowledge-base/articles/domestic-limited-liability-companies-forms-and-fees, checked October 1, 2026
- Connecticut formation fee: Filing fee, official source read 2026-10-01: business.ct.gov/-/media/businessonestop/fee-schedule-revised-712020.pdf, checked October 1, 2026
- Connecticut Secretary of the State, Business Services Division (multira state research spine): business.ct.gov/business-services/file-annual-report, checked August 12, 2026
- Connecticut Secretary of the State, Business Services Division (multira state research spine): business.ct.gov/knowledge-base/articles/annual-report/file-an-annual-report, checked August 12, 2026
- Connecticut yearly filing: Annual report: fee, official source read 2026-10-01: business.ct.gov/knowledge-base/articles/domestic-annual-report-forms-and-fees, checked October 1, 2026