DRS: CT-1065 1120SI EXT


CT-1065/CT-1120SI EXT, Application for Extension of Time to File Connecticut Composite Income Tax Return.  If you are filing a calendar-year Form CT-1065/CT-1120SI, file Form CT-1065/CT-1120SI EXT on or before April 15.  If the due date falls on a Saturday, Sunday, or legal holiday, the next business day is the due date. If you are filing Form CT-1065/CT-1120SI for a taxable year other than the calendar year, file Form CT-1065/CT-1120SI EXT on or before the fifteenth day of the fourth month following the close of the taxable year.  To find the form or further instructions, click here.


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Connecticut business taxpayers can electronically file most Connecticut business tax returns using the Taxpayer Service Center (TSC-BUS). The TSC is an interactive tool that provides a free, fast, easy, and secure way to conduct business with DRS.  Click here for more information.