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You do not need to login to the Taxpayer Services Center (TSC) to access the following services. File Form CT-1096 and associated 1099-MISC Forms File/Pay Form CT-1065/CT-1120SI File/Pay Form CT-472, Attorney Occupational Tax Return File/Pay Form OP-424, Business Entity Tax Return File/Pay Form CT-1041, Income Tax Return for Trusts and Estates Register New Business Review FAQs SSL Welcome to the Connecticut Department of Revenue Services (DRS) Taxpayer Service Center ( TSC )! ATTENTION: My Secure Mailbox Users, effective January 16, 2020, the “My Secure Mailbox” feature will be disabled. If you need to contact DRS, click here to see the other options. NOTE TO TAXPAYERS: Effective for tax periods ending on or after December 31, 2019, the late payment penalty for electronic filers has been changed from a graduated rate to a flat percentage. The late payment penalty is 10% for all tax types other than Sales and Use Taxes, which is at 15%. Click here for more information on the legislative updates for 2019. You will need your Connecticut Tax Registration Number (CT REG) to log into the Connecticut Taxpayer Service Center. Enter your Connecticut Tax Registration Number (CT REG): CT REG: What is my CT REG (Do not include hyphens.) DRS Home CT.gov home Feedback/Questions State of Connecticut Disclaimer and Privacy Policy . Copyright © 2002-2022 State of Connecticut...