What returns can be filed using TSC?
You may use the TSC to file the following returns on the Internet or by telephone: • Form OS-114, Sales and Use Tax Return; • OP-210, Room Occupancy Tax Return; • Form CT-WH, Connecticut Withholding Tax Payment; and • Form CT-941, Connecticut Quarterly Reconciliation of Withholding. You may electronically file the following returns on the Internet only: • Form CT-945, Connecticut Annual Reconciliation of Withholding for Nonpayroll Amounts; • Form CT-8109, Connecticut Withholding Tax Payment Form for Nonpayroll Amounts; • Form CT-W3, Annual Reconciliation of Withholding, along with corresponding W-2 forms; • Form CT-1096, Connecticut Annual Summary and Transmittal of Information Return, along with corresponding 1099 forms; • Form CT-941X, Amended Connecticut Reconciliation of Withholding; • Form OP-424, Business Entity Tax Return; • Form 472, Attorney Occupational Tax Return; • OP-336, Nursing Home User Fee; • O-372, Admissions and Dues Tax Return; • Form 1120ES, Estimated Corporation B
