Connecticut | Personal Tax Extension | Form CT-1040 EXT | Application for Extension of Time to File Connecticut Income Tax Return for Individuals

Modified on Tue, 14 Jan at 1:15 PM

State Abbreviation	CT
State Name	Connecticut
Extension Status	Approved with Federal Extension
Return Due Date	April 15, 2025
Extended Due Date	October 15, 2025
Other Information	Connecticut grants an automatic 6-month extension provided you have been approved for a federal extension by the IRS. You will be subject to interest and may be subject to a penalty on any amount of tax not paid on or before the original due date of your return.
Online Payment	Connecticut \| Online Tax Extension Payment
Payment Voucher Title	Form CT-1040 EXT \| Application for Extension of Time to File Connecticut Income Tax Return for Individuals
State Payment Agency	Department of Revenue Services, State of Connecticut
Mailing Address with Payment	No payment included: Department of Revenue Services, State of Connecticut P.O. Box 2976 Hartford, CT 06104-2976. With payment included: Department of Revenue Services, State of Connecticut P.O. Box 2977 Hartford, CT 06104-2977
Online Payment Options \| Credit Card	Visit www.acipayonline.com and select “state payments.” A convenience fee will be charged by the service provider.
Online Payment Options \| ACH Debit	To make direct payment from a bank account, visit the TSC at https://portal.ct.gov/TSC and follow the prompts or visit https://drsindtax.ct.gov to make a payment without logging into the TSC.
Failure to File Penalties	Greater of $50 or 10% of unpaid tax.
Failure to Pay Penalties	10% of unpaid tax.