IMPORTANT INFORMATION - the following tax types are now available in myconneCT: Individual Income Tax, Attorney Occupational Tax, Unified Gift and Estate Tax, Controlling Interest Transfer Tax, and Alcoholic Beverage Tax. - Click here for the latest information.


  1. Pay electronically using the TSC-IND
  2. Pay by Credit Card using ACI Payments formerly Official Payments
  3. 2021 CT-1040ES

PLEASE NOTE:  Estimates printed using a tax software have a different PO BOX than the one on the DRS Website.  You must use PO BOX 5053 for software printed versions.


April 15, 2021 - should equal 25% of required annual payment

June 15, 2021 - should equal 25% of required annual payment - Total of 50% should be paid by this date

Sept. 15, 2021 - should equal 25% of required annual payment - Total of 75% should be paid by this date

Jan. 15, 2022 - should equal 25% of required annual payment - Total of 100% should be paid by this date

An estimate will be considered timely filed if received on or before the due date, or if the date shown by the U.S. Postal Service cancellation mark is on or before the due date.  Taxpayers who report on other than a calendar year basis should use their federal estimated tax installment due dates.  If the due date falls on a Saturday, Sunday, or legal holiday, the next business day is the due date.  For more information on estimated income tax, please review IP 2018(16), Estimated Connecticut Income Taxes; and IP 2018(11), A Guide to Calculating Your Estimated Income Tax Installments.
Where to mail

Department of Revenue Services
PO Box 2932
Hartford CT 06104-2932 

Check on the Amount of Estimated Payments Made
  • Online anytime:  Log into the TSC-IND to view the payments that you made. After you log in, select "View Processed Payments" on the Main Menu.
  • Telephone DRS during business hours:  For telephone assistance, call DRS at 860-297-5962, Monday - Friday between 8:30 a.m. and 4:30 p.m., Eastern Time.