Connecticut
Connecticut business compliance calendar
What Connecticut asks of a company or a nonprofit registered or doing business there, beyond the federal filings every organization owes. Pick your entity type for the full calendar with dates.
LLC 2026LLC 2027C corporation 2026C corporation 2027S corporation 2026S corporation 2027partnership 2026partnership 2027sole proprietorship 2026sole proprietorship 2027nonprofit 2026nonprofit 2027
Registration and franchise filings
| Entity | Filing | Fee | If missed |
|---|---|---|---|
| Corporations | Annual report, by the last day of the anniversary month of its formation, with the Connecticut Secretary of the State | $150 | Administrative dissolution after continued failure |
| LLCs | Annual report, by March 31 each year, with the Connecticut Secretary of the State | $80 | Administrative dissolution after continued failure |
| Partnerships | Annual report, by March 31 each year, with the Connecticut Secretary of the State | $80 | Administrative dissolution after continued failure |
| Nonprofits | Annual report, on the anniversary date of its formation, with the Connecticut Secretary of the State | $50 | Administrative dissolution after continued failure |
Taxes and employers
- Corporate income tax
- Yes. C corporations file a Connecticut return by the 15th day of the fourth month after the year ends, with the Connecticut Department of Revenue Services.
- Personal income tax
- Yes. S corporations and partnerships file a Connecticut information return, and employers withhold state income tax.
- Employers
- Register for unemployment insurance and file wage reports every quarter. Reconcile income tax withholding after year end.
- Sources
- Connecticut Secretary of the State, Connecticut Department of Revenue Services
All Connecticut rules in the pack
- Connecticut annual reportby the last day of the anniversary month of its formation
- Connecticut annual reportby March 31 each year
- Connecticut annual reportby March 31 each year
- Connecticut nonprofit annual reporton the anniversary date of its formation
- Connecticut charitable organization registration renewalby the last day of the 11th month after the fiscal year ends (the last day of November for a calendar year)
- Connecticut corporate income tax returnby the 1st day of the 5th month after the fiscal year ends (May 1 for a calendar year)
- Connecticut corporate estimated tax paymenton the 15th day of the 4th, 6th, 9th, 12th months of the fiscal year (April 15, June 15, September 15, December 15 for a calendar year)
- Connecticut pass through entity returnby the 15th day of the 3rd month after the fiscal year ends (March 15 for a calendar year)
- Connecticut personal income tax return with business incomeby April 15 each year
- Connecticut unemployment insurance wage reportby the last day of the 1st month after each quarter
- Connecticut annual withholding reconciliationby January 31 each year
- Connecticut Paid Leave contributionsby the last day of the 1st month after each quarter
- Connecticut harassment prevention training (3 or more employees)by January 31 each year
- Connecticut retirement savings mandate (MyCTSavings, 5 or more employees)with no fixed date
- Connecticut sales tax returnby the last day of the 1st month after each quarter