| State Name | Connecticut |
| Business Entity Type | LLCs / Partnerships |
| Extension Status | Approved with Federal Extension |
| Return Due Date | March 17, 2025 |
| Extended Due Date | September 15, 2025 |
| Other Information | * Connecticut grants your business an automatic 6-month extension provided you have obtained an approved IRS extension. * The extension is NOT an extension to pay any taxes you may have due. * Tax payments are due by the original return due date. |
| Online Payment | Connecticut | Online Tax Extension Payment |
| Payment Voucher Form | Form CT-1065/CT-1120SI EXT | Application for Extension of Time to File Connecticut Pass-Through Entity Tax Return |
| State Payment Agency | Connecticut | Department of Revenue Services |
| Mailing Address with Payment | N/A |
| Failure to File Penalties | $50 penalty, or 10% of the tax due, whichever is greater. |
| Failure to Pay Penalties | $50 penalty, or 10% of the tax due, whichever is greater. |
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