NOTICE: Taxpayers are strongly encouraged to visit the DRS website for answers to many questions. You may also email DRS at If contacting DRS by phone, please plan for wait times that may be longer than usual. See DRS FAQ's, which now include important information regarding Connecticut sales tax. Frequently Asked Questions

Prior Years Sales Tax Return

Name  Type Description
Due Date
OS-114 Form  Sales and Use Tax Return 11/2017 varies
O-88 Instructions  Instructions for OS-114 11/2017 N/A