CT-1065/CT-1120SI EXT: Application for Extension of Time to File Connecticut Composite Income Tax Return (2024)
Connecticut · Connecticut DRS · Used for tax years 2024
Form CT-1065/CT-1120SI EXT requests a six-month extension to file the 2024 Connecticut Composite Income Tax Return and furnish Schedule CT K-1 to members. It reports the pass-through entity’s Connecticut composite income tax liability, which may be estimated. The extension does n
Who files this form
Partnerships and S corporations use Form CT-1065/CT-1120SI EXT to request a six-month extension to file their Connecticut Composite Income Tax Return, Form CT-1065/CT-1120SI. It also requests the same extension to furnish Schedule CT K-1 to members.
A federal extension does not automatically extend the Connecticut filing deadline. The pass-through entity must file this Connecticut extension form to request additional time.
When it's due
- 2024 calendar-year extension request: File on or before March 15, 2025, the date printed in the form instructions. If the due date falls on a Saturday, Sunday, or legal holiday, filing by the next business day is considered timely.
- 2024 calendar-year extended filing date: The form requests an extension to September 15, 2025, to file the return and furnish Schedule CT K-1 to members.
The extension does not extend the time to pay. Pay the amount shown on Line 1 by the original return due date.
What you'll need
Have the following information ready:
- The pass-through entity’s name, address, entity type, Federal Employer ID Number (FEIN), and Connecticut Tax Registration Number.
- The entity’s 2024 Connecticut composite income tax liability. You may estimate it.
- Whether a federal extension was requested on Form 7004. If it was not, an explanation of why you are requesting the Connecticut extension.
- Taxable-year dates and the requested extension date, if filing for a year other than the calendar year.
- The general partner’s or corporate officer’s signature, title, date, and telephone number, plus paid preparer details if applicable.
- Bank account or card information for an electronic payment, if tax is due.
How to file
File and pay electronically. Do not mail a paper return to DRS.
To use myconneCT:
- Go to portal.ct.gov/DRS-myconneCT and log in.
- Find your tax account on the Summary screen.
- Select File an Extension.
- Choose your payment method and file Form CT-1065/CT-1120SI EXT. If tax is due, make the electronic payment when filing.
You can pay by direct withdrawal from a checking or savings account, with a withdrawal date you select up to the due date. You can also pay by credit card or comparable debit card. Card payments carry a convenience fee, which is disclosed before you complete the transaction, and are effective on the date of the charge.
Keep the confirmation number and a copy of the form for your records.
Common mistakes
- Leaving Line 1 blank. An amount is required. Enter zero “0” if no tax is due.
- Using the wrong year’s form. Forms are year specific. Use the 2024 form for the 2024 tax year to avoid processing delays.
- Treating the filing extension as a payment extension. Tax not paid by the original due date may be subject to interest and penalties.
- Relying only on a federal extension. An IRS extension does not automatically extend the Connecticut filing date.
- Mailing the form or paying by check. Electronic filing and payment are required. If using your financial institution’s online banking system, verify that it sends an electronic funds transfer (EFT), not a check.
Questions people ask
Do I need to explain why I want an extension?
Not if the entity has already filed federal Form 7004 with the IRS. If it has not, the entity may request the Connecticut extension for reasonable cause and must explain the reason.
Will DRS confirm that my extension was approved?
DRS will notify you only if the extension request is denied.
Does this form give me more time to pay?
No. To request an extension of the payment due date, you must file Form CT-1127, Application for Extension of Time for Payment of Income Tax.
What happens if I pay late?
In general, unpaid tax accrues interest at 1% per month or fraction of a month until paid in full. The late payment penalty is 10% of the tax not paid by the original return due date.
Can a late filing penalty apply if no tax is due?
Yes. If no tax is due, the Commissioner of Revenue Services may impose a $50 penalty for late filing of a return or report required by law.