Connecticut State Department of Revenue Services

Walk-in services at all DRS branch office locations remain suspended. Email DRS at drs@po.state.ct.us. Email the Priority One Taxpayer Assistance Program: DRSPriorityOne_CollectionsAssist@po.state.ct.us. Please check our Frequently Asked Questions page.

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.