DRS: CT-1065 1120SI

Form CT-1065/CT-1120SI, Connecticut Composite Income Tax Return, is due on or before April 15th for calendar year filers. For fiscal year filers, the due date is on or before the fifteenth day of the fourth month following the close of the taxable year.  If the due date falls on a Saturday, Sunday or legal holiday, the next business day is the due date.  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.