Paper: Letter (8.5in x 11in)
Payable to "Commissioner of Revenue Services"
on or before January 31st of the succeeding calendar year.
If the due date falls on a Saturday, Sunday or legal holiday, it must be submitted on the first working day AFTER.
To report a reconciliation of tax withheld during the year.
Connecticut Department of Revenue Services
CT State Tax Information: (860) 297-5962
CT State Tax Information: (800) 382-9463 (Within CT)