CT State Tax Registration (2024)

Connecticut State Tax Registration
What Tax Identification Numbers do I need in the state of Connecticut?
You need two separate Tax Identification Numbers in the state of Connecticut:
How do I get my Income Tax Identification Number?
You can register online at the CT Department of Revenue (DOR) website. Contact the agency directly at 1-860-297-5962 for registration assistance or to check if a tax identification number is already assigned for your business.

Generally, this Tax ID is a number ending in -000.

How do I get my Unemployment Tax Identification Number?
You can register online at the CT Department of Labor (DOL) website. Contact the agency directly at 1-860-263-6550 for registration assistance or to check if a tax identification number is already assigned for your business.

This Tax ID is a 7-digit number formatted as XX-XXX-XX.

What Tax Rates do I need in the state of Connecticut?
You only need to know one tax rate assigned for the current year:
  • State Unemployment Contribution Rate
Your contribution rate will be assigned when you register and will be updated on an annual basis from the Department of Labor. Contact the agency directly at 1-860-263-6550 to verify your current rate.
How do I update my payroll account?
Send any tax identification number or tax rate updates to your Account Executive or email [emailprotected].
CT State Tax Registration (2024)
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