Monthly filing due dates are the last day of the month following the end of the filing period.
Quarterly filing due dates are the last day of January, April, July and October.
Annual filing due dates are the last day of January.
If the due date falls on a Saturday, Sunday, or legal holiday, the next business day is the due date. To find the form or further instructions, click here.
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TSC - Simplified Paperless Filing for your Connecticut Withholding Tax, Sales and Use Taxes, Disaggregated Sales Tax Report, Business Entity Tax, Corporation Business Tax, Room Occupancy Tax, Attorney Occupational Tax, Admissions and Dues Tax, Trust and Estate, Composite Income Tax, and Nursing Home User Fee
The Nursing Home User Fee and the Disaggregated Sales Tax Report can only be filed through the TSC.