Connecticut
State of Connecticut Business Income Tax Extensions
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IRS Form 7004
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General Instructions
Choose your state from the list below to access detailed instructions for both business and personal tax extensions.
Corporation business tax returns are due on the 15th day of the month following the due date of the equivalent Federal return (for fiscal year filers) or May 15th for C-corps and April 15th for S-corps.
Connecticut offers a 6-month extension, which moves the filing deadline to October 1 (for calendar year filers).
Use Form CT-1120 to apply for a Connecticut extension. This form can be filed by paper mail or online via Connecticut’s Taxpayer Service Center (TSC).
An extension of time to file is not an extension of time to pay. If you owe Connecticut tax, it must be paid by the original due date to avoid penalties and interest. You can mail your extension payment with Form CT-1120, or you can pay electronically through the Taxpayer Service Center (TSC).
If you have filed a Federal tax extension, you do not have to give a reason for needing the Connecticut tax extension. But if you don’t have a valid Federal extension, you are required to provide “reasonable cause” for requesting an extension for your Connecticut return.
Connecticut State Income Tax Extension Forms
Extend your business tax return due date by 6 months in minutes! Use FileLater to e-file Form 7004 for IRS Forms 1120, 1120S, 1065, and more.
Website: Connecticut Department of Revenue Services
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Form CT-1120 EXT