CONNECTICUT Tax Forms and Instructions
Below are the relevant links for CT State Tax information.
Connecticut State Mandate Tax preparers who have been approved by the IRS are automatically approved to submit Connecticut returns electronically. There is no separate approval process for Connecticut. Electronic filing is required for those tax practitioners who prepared more than 50 returns for the previous filing season .



CONNECTICUT Tax Forms and Instructions Information
Online Credit Card Payments
  • Offical Payments
    Or call 1-800-2PAY-TAX (Offical payments charges a nominal fee for this service)(Use Jurisdiction Code 2000 for Individual and Jurisdiction Code 2006 for Business Taxes)
Mailing Addresses
  • Return Mailing Address:
    Department of Revenue Services State of Connecticut
    PO BOX 2976
    Hartford CT 06104-2976

  • Return Mailing Address without Refund:
    Department of Revenue Services State of Connecticut
    PO BOX 2977
    Hartford CT 06104-2977

  • Estimates Mailing Address:
    Department of Revenue services
    PO Box 2932
    Hartford, CT 06104-2921

  • Amended Return Mailing Address:
    Department of Revenue Services
    PO Box 2978
    Hartford, CT 06104-2978

  • Extension Mailing Address:
    You do not have to file Form CT-1040EXT if you do not owe any additional CT income tax and you filed a request for extension to file with the Internal Revenue Service. If you did not file an extension to file with the Internal Revenue Service, you need to file form CT-1040EXT and mail to the appropriate address:

    Department of Revenue Services State of Connecticut
    PO BOX 2977
    Hartford CT 06104-2977

  • Electronic Filing:
    Connecticut accepts Resident, Nonresident, and Part-year returns electronically. They can be transmitted with the Federal return or transmitted as a State only return.
Federal Tax Information