Connecticut State Department of Revenue Services

NOTICE: Taxpayers are strongly encouraged to visit the DRS website for answers to many questions. You may also email DRS at drs@po.state.ct.us. 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

Information for Businesses

  1. Starting a Business?
  2. File & Pay Online
  3. Reset/Change Admin Business Password
  4. Business Tax Help
  5. Sales & Use Tax
  6. Corporation Business Tax
  7. Withholding Tax

More for Businesses

  1. Amend a business return
  2. Business Tax Payment Options
  3. Calendar of Due Dates
  4. CERC - CT Economic Resource Center
  5. Change Business Address
  6. Change Business Name
  7. Change Business Structure
  8. Close a business
  9. e-Services Information
  10. File a protest
  11. Forms & Instructions
  12. Obtain tax clearance - business only
  13. Obtain status letter
  14. Attorney Occupational Tax
  15. Report a lost or stolen check
  16. Sales & Use Tax Filing information