Search Department of Revenue Services Filtered Topic Search

Filing for an Extension of Time to File

Requesting a six-month Extension of Time to File: Use Form CT-1040 EXT to request a six-month extension to file your Connecticut income tax return for individuals. This form also extends the time to file your individual use tax. It is not necessary to include a reason for the Connecticut extension request if you have already filed an extension request on federal Form 4868 with the Internal Revenue Service. If you did not file federal Form 4868, you can apply for a six-month extension to file your Connecticut income tax return provided you have good cause for your request. You can file electronically following the steps below under How to File or on paper.

Extension Request Not Required if No Additional Tax is Due and You filed a Federal Extension:

If you expect to owe no additional Connecticut income tax for the taxable year, after taking into account any Connecticut income tax withheld from your wages or any estimated Connecticut income tax payments you have made (or both), and you have requested an extension of time to file your federal income tax return, you are not required to file Form CT-1040 EXT.

How to File: 

  • Use TSC-IND:  You can file your extension request electronically, using WebFile.  Payment of any tax due can be made by direct payment from your checking or savings account or by check. (If you mail your payment, be sure that it is received or U. S. post marked by April 15) 
  • Mail in Form CT-1040EXT:  Fill out the form and mail it with payment of tax due to the address on the form.
To be timely, it must be received or bear a U. S. post mark date on or before April 15.