Connecticut

State of Connecticut Business Income Tax Extensions

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General Instructions

Connecticut corporation business tax returns are due by the 1st day of the month following the deadline for the corresponding Federal tax return, or April 1 for calendar year 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 October 1 (for calendar year taxpayers).

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): www.ct.gov/drs/cwp

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).

If you have a valid Federal tax extension (IRS Form 7004), 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):

www.ct.gov/drs/lib/drs/forms/2014forms/corp/ct-1120_ext.pdf

 

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