CT-W3, Connecticut Annual Reconciliation of Withholding Tax Return Form CT-W3 is due the last day of January and will be completed as part of the electronic filing process when you upload Copy 1 of federal Forms W-2. Do not mail in Form CT-W3. 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.