Connecticut

State of Connecticut Business Income Tax Extensions

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General Instructions

Connecticut corporation business tax returns are due by the 15th day of the month following the deadline for the corresponding Federal tax return or May 15th for calendar year C-corp filers and April 15th for S corp filers. If you cannot file by that date, you can request a state tax extension. A Connecticut business extension will give you 6 more months to file, which moves the filing deadline to November 15th for calendar year C-corp's and October 15th for calendar year S-corps.

To request a Connecticut extension, file Form CT-1120 (Application for Extension of Time to File Corporation Business Tax Return) by the original due date of your return (April 1). If you’d rather file your state tax extension online, you can go to the Connecticut Taxpayer Service Center (TSC)

Remember that a tax extension only gives you more time to file your return. It does not extend the time you have to pay Connecticut business tax. All corporations are expected to pay their state tax liability by the original filing deadline (April 1), or else penalties will apply. You can make a payment online using the TSC (see above link), or mail a payment with your Connecticut extension request (Form CT-1120).

Connecticut requires the filing of Form CT-1120 for all business tax extensions however if you have filed a Federal tax extension, you are not required to provide a reason for requesting a Connecticut extension. However, if you do not have a Federal extension, you will need to give reasonable cause for your Connecticut tax extension request.

For more information, please visit the Connecticut Department of Revenue Services website: www.ct.gov/drs

Connecticut State Income Tax Extension Forms

Form CT-1120 EXT (Application for Extension of Time to File Corporation Business Tax Return):

Mail with payment to the following address:

Department of Revenue Services

State of Connecticut

P.O. Box 2974

Hartford, CT  06104-2974

Mail without payment to the following address:

Department of Revenue Services

State of Connecticut

P.O. Box 150406

Hartford, CT  06115-0406