Connecticut Business Filing Deadlines & Ongoing Requirements

Connecticut ongoing requirements

(LLCs): every year by March 31; fee $80.
(corporations and nonprofits): every year around the formation anniversary; fee $150.
State tax returns and payments (sales, withholding, unemployment) follow the schedule your agency assigns when you register.

Register for state taxes with Connecticut Department of Revenue Services. Official page
Business-level tax: Corporation Business Tax; optional Pass-Through Entity Tax.
Sales tax: get a Sales and use tax permit from Connecticut Department of Revenue Services before you sell taxable goods. Official page
Remote sellers must register once sales into the state pass $100,000 a year.
There are no local sales taxes.
If you have employees, withhold Connecticut income tax from wages and register for withholding. Official page

Register for unemployment insurance with Connecticut Department of Labor. The 2026 taxable wage base is $27,000 per employee; experience-rated rates run from 0.1% to 10%. Official page
New employers start at 1.9%.
Workers' compensation through Connecticut Workers' Compensation Commission and private insurers. Required when: 1 employee
CT Paid Leave contributions (Connecticut Paid Leave Authority). Applies from 1 employee.
Paid sick leave is required statewide from 25 employees.
Post the required labor notices at your workplace. Official page

Form your LLC or corporation with Connecticut Secretary of the State. Official page
A trade name (DBA) is registered with the Town clerk.
Registered entities also file assumed names locally, not with the state.

Business filings and annual reports: Connecticut Secretary of the State. Official page
Taxes: Connecticut Department of Revenue Services. Official page
Unemployment insurance and labor rules: Connecticut Department of Labor. Official page
Workers' compensation: Connecticut Workers' Compensation Commission.
Contractor licensing: Connecticut Department of Consumer Protection (home improvement contractor registration).
Real estate licensing: Connecticut Department of Consumer Protection.
Alcohol licensing: Connecticut DCP Liquor Control Division.
Child care licensing: Connecticut Office of Early Childhood.
Health facility licensing: Connecticut Department of Public Health.

Town zoning/occupancy approvals (Town clerk / zoning office): Connecticut has no general local business license; trade names are registered with the town clerk.
Cannabis: adult-use licensing, regulated by Connecticut Department of Consumer Protection.

Checked against official sources on October 13, 2026. Rules change; confirm each item with its agency.

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