Connecticut Sales Tax Due Dates — 2026
Exact Connecticut sales tax filing deadlines for 2026 and 2027 — every period, already adjusted for weekends and holidays. Find your filing frequency, see the dates, and add them to your calendar.
Connecticut Monthly Sales Tax Due Dates — 2026
| Filing period | Due date |
|---|---|
| December 2025 | Mon, February 2, 2026moved off weekend/holiday |
| January 2026 | Mon, March 2, 2026moved off weekend/holiday |
| February 2026 | Tue, March 31, 2026 |
| March 2026 | Thu, April 30, 2026 |
| April 2026 | Mon, June 1, 2026moved off weekend/holiday |
| May 2026 | Tue, June 30, 2026 |
| June 2026 | Fri, July 31, 2026 |
| July 2026 | Mon, August 31, 2026 |
| August 2026 | Wed, September 30, 2026 |
| September 2026 | Mon, November 2, 2026moved off weekend/holiday |
| October 2026 | Mon, November 30, 2026 |
| November 2026 | Thu, December 31, 2026 |
Dates are adjusted for weekends and U.S. federal holidays. Some states observe additional state holidays — always confirm the exact date with the Connecticut Department of Revenue Services.
Connecticut sales tax filing rules
Good to know
Connecticut returns are due the last day of the month following the reporting period.
Filing Connecticut sales tax late
Connecticut charges a late-filing and late-payment penalty plus interest on any unpaid tax, and most states apply a minimum penalty even on a zero return. File on time — even a return with no tax due must be filed. Confirm current penalty amounts with the Connecticut Department of Revenue Services.
Never miss a Connecticut deadline
Jupid keeps your books current all year, so when a sales tax or income tax deadline lands, your numbers are already done.
Connect your bank
Jupid connects to your business bank account and auto-categorizes transactions for sales tax and income tax.
Right on WhatsApp & iMessage
Ask about deadlines, deductions, or filing from the messaging apps you already use.
95.9% categorization accuracy
AI bookkeeping that learns your business so your numbers are filing-ready, not a year-end scramble.
Frequently Asked Questions
Official sources
Last verified 2026-05-30 against state revenue references. This page is for general information, not tax advice — confirm your specific due dates with the Connecticut Department of Revenue Services.
Keep your books filing-ready
Jupid does your bookkeeping automatically — connect your bank, and your sales tax and income tax numbers stay current all year.
Try Jupid