Vendor setup
Register a business in Connecticut
The filing office, forms, steps and next stops for registering a business in Connecticut. Every line shows the official page it came from, and the day we read it.
The order to do it in
Choose a business type and get your EIN first. Then file with the state filing office below, and check your city and county before you start work.
Filing office
- Connecticut entities are formed with the Secretary of the State, Business Services Division, mostly online through the Business.CT.gov account. Connecticut Secretary of the State, as of
Forming an LLC
- A Connecticut LLC is formed by a Certificate of Organization (including a statutory agent), filed online. Connecticut Secretary of the State, as of
- Certificate of Organization filing fee: $120 (as of Oct 6, 2026) Connecticut Secretary of the State, as of
Forming a corporation
- A Connecticut stock corporation is formed by a Certificate of Incorporation, filed online. Connecticut Secretary of the State, as of
- Certificate of Incorporation filing fee: $250 (as of Oct 6, 2026) Connecticut Secretary of the State, as of
Annual or biennial report
- Connecticut LLCs file annual reports online between January 1 and March 31. Connecticut Secretary of the State, as of
- LLC annual report: $80 (as of Oct 6, 2026) Connecticut Secretary of the State, as of
- Domestic stock corporation annual report: $150 (as of Oct 6, 2026) Connecticut Secretary of the State, as of
Assumed name (DBA)
- In Connecticut a trade name certificate is filed with the town clerk where the business is transacted, not the Secretary of the State. New forms apply from October 1, 2026, and must be notarized. Connecticut Secretary of the State, as of
- Trade name certificate, payable to the town clerk: $20 (as of Oct 6, 2026) Connecticut Secretary of the State, as of
State tax registration
- Connecticut businesses register for state taxes through myconneCT with the Department of Revenue Services, using the FEIN (or sole proprietor SSN). Connecticut Department of Revenue Services, as of
State rules for pool, lifeguard and contractor work
These lines point to the state’s own rules. Whether one applies to your work is for the state to say, so confirm with the agency named in each line.
- Connecticut public pools follow RCSA 19-13-B33b and the DPH Public Pool Design Manual. DPH approves plans and inspects before opening. Connecticut Department of Public Health, as of
City and county licences
City and county licences vary by place. Check with your city hall or county clerk before you start work.
Sources
- Domestic Limited Liability Companies Forms and Fees Connecticut Secretary of the State. As of .
- Domestic Stock Corporation Fees in Connecticut Connecticut Secretary of the State. As of .
- Trade Names Connecticut Secretary of the State. As of .
- Registering with DRS Connecticut Department of Revenue Services. As of .
- Public Pools Connecticut Department of Public Health. As of .
Official pages change. Each line shows the day we last read it.
Last checked