NOTICE: Taxpayers are strongly encouraged to visit the DRS website for answers to many questions. You may also email DRS at drs@po.state.ct.us. If contacting DRS by phone, please plan for wait times that may be longer than usual. See DRS FAQ's, which now include important information regarding Connecticut sales tax. Frequently Asked Questions

Business Tax Return and Payment Due Dates


To avoid possible penalty and interest charges, ACH Debit taxpayers must initiate their transaction no later than midnight on the actual due dates below for the tax to be considered paid timely.  Sign-up to receive monthly tax filing and payment due date reminders via our Filing Reminders e-alerts.

2020 Due Dates

For Period Ending:  EFT Due Date: 
December 31, 2019  Friday, January 31, 2020 
January 31, 2020  Monday, March 2, 2020
February 29, 2020  Tuesday, March 31, 2020 
March 31, 2020  Thursday, April 30, 2020 
April 30, 2020  Monday, June 1, 2020 
May 31, 2020  Tuesday, June 30, 2020 
June 30, 2020  Friday, July 31, 2020 
July 31, 2020  Monday, August 31, 2020
August 31, 2020
Wednesday, September 30, 2020
September 30, 2020
Monday, November 2, 2020
October 31, 2020
Monday, November 30, 2020
November 30, 2020 Thursday, December 31, 2020
December 31, 2020 Monday, February 1, 2021

All Other Filers...

Quarterly Calendar Listing of Return and Due Dates

When it's time to file, please File Online. The Taxpayer Service Center (TSC) is free, fast, easy, and a secure way to conduct business with DRS.

Connecticut business taxpayers must electronically file and pay most Connecticut business tax returns using the Taxpayer Service Center.