Connecticut Personal Tax Extension Guide
Connecticut’s Automatic Extension with Federal Approval
The Connecticut Department of Revenue Services (DRS) aligns with the federal tax extension system. If you’ve received an extension from the IRS by filing Form 4868, you are automatically granted a six-month extension to file your Connecticut state tax return. Your new extended due date becomes October 15, 2025.
Important Caveats on Payment Obligations
Although Connecticut honors the federal extension for filing, it does not grant more time to pay. Interest will be charged on unpaid tax after April 15, 2025, and penalties may apply. Estimate your tax liability and submit payment before the deadline to avoid charges.
How to Make Extension Payments
Connecticut offers several payment methods:
- Credit Card: Use www.acipayonline.com and select “state payments.” A convenience fee applies.
- ACH Debit: Pay via the Taxpayer Service Center at portal.ct.gov/TSC, or go to drsindtax.ct.gov for no-login payments.
Using Form CT-1040 EXT
To pay by mail, use Form CT-1040 EXT. It ensures your payment is credited properly. You must still file your return by October 15, 2025.
Mailing Addresses for Extension Payments
- No PaymentDepartment of Revenue Services
P.O. Box 2976
Hartford, CT 06104-2976
- With Payment:Department of Revenue Services
P.O. Box 2977
Hartford, CT 06104-2977
Late Payment and Filing Penalties
A penalty of the greater of $50 or 10% of unpaid tax applies for failing to file. A 10% penalty applies for late payment. Interest is charged from the original due date.
Best Practices
- Pay as much as you can by April 15 to reduce charges.
- Use secure online portals for confirmation.
- Save confirmation numbers and payment records.
Final Thoughts
By aligning with the IRS, Connecticut simplifies the extension process. However, payment is still due on time. File accurately, pay promptly, and use digital tools for the smoothest experience.
Quick Reference Table
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 |
|
Online Payment | Connecticut | Online Tax Extension Payment |
Payment Voucher Title | Form CT-1040 EXT |
State Payment Agency | Connecticut Department of Revenue Services |
Mailing Address with Payment | No payment: Department of Revenue Services P.O. Box 2976 Hartford, CT 06104-2976 With payment: Department of Revenue Services P.O. Box 2977 Hartford, CT 06104-2977 |
Online Payment Options | Credit Card | Visit www.acipayonline.com and select “state payments.” A convenience fee applies. |
Online Payment Options | ACH Debit | Use portal.ct.gov/TSC or drsindtax.ct.gov to pay without login. |
Failure to File Penalties | Greater of $50 or 10% of unpaid tax. |
Failure to Pay Penalties | 10% of unpaid tax. |
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