Connecticut State Department of Revenue Services

For Businesses

1. Starting a Business?
2. File & Pay Online
3. Business Information Website
4. Sales & Use Tax
5. Corporation Business Tax
6. Business Entity 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
    • IP 2018(10), Successor Liability and Request for Tax Clearance
    • AU-866, Form used to request a clearance
13. Obtain status letter
14. Occupational Filers
15. Report a lost or stolen check
16. Sales & Use Tax Filing information