First LLC Guide › Connecticut

Starting an LLC in Connecticut: what you should know first

Filing a Connecticut LLC costs $120. The Annual Report costs $80 a year. Our pick is Mainstay Filing; $877 covers three years.

By kind of owner

Side hustle: Quiet-year cost: $279 in year 2 with Mainstay Filing, including the $80 state report in that year.
Online business: Required registered agent. 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.
Startup: Filing: Certificate of Organization with the Connecticut Secretary of State. Write the operating agreement before you open the bank account.
First-time owner: Report due: On or before March 31.

Best LLC formation service in Connecticut for a first-time owner?

Mainstay Filing: $319 in year 1 including the $120 filing fee, $279 in year 2.

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