Connecticut

 

Last Updated June 17, 2026

Connecticut businesses must comply with state withholding, unemployment insurance, and payroll tax reporting rules. Use these resources to find employer registration links, tax information, and state agency contacts.

State Tax Guidelines

Connecticut Department of Revenue Services – Withholding Tax

Agency Information

Add to existing company setup

Submit a request to your service team to add CT (withholding) and/or CTSUI  (unemployment) to your company setup.  Please include the below with your request:

  • Withholding – Deposit Frequency and Account number.  If you’re unsure of your deposit frequency or account number, you can call the agency at 860-297-5962
  • Power of Attorney – POA is required, please obtain the prefilled form from your client service representative.

Register a new company

Register online at https://portal.ct.gov/drs/withholding-taxes/new-employer-information. Select Register a New Business Online, and follow the prompts. You will receive a temporary account number, please Do Not provide this number to your service team. You will receive your permanent CT Tax Registration Number and tax deposit frequency within 7 – 10 business days.

Power of Attorney

Power of Attorney is required, please obtain the prefilled form from your client service representative.

Connecticut Department of Labor, Employment Security Division – Unemployment tax

Agency Information

Add to existing company setup

Submit a request to your service team to add CTSUI  (unemployment) to your company setup. Please include the below with your request:

  • Unemployment – Tax rate and Account number.  This can be found on a Tax Rate Notice or the Quarterly contribution report.  If you’re unsure of your tax rate or account number, you can call the agency at 860-263-6550.
  • Power of Attorney – POA is required, please obtain the prefilled form from your client service representative.

Register a new company

Register online at https://reemploycttax.dol.ct.gov/accessct/faces/tax… and follow the prompts. You should receive your CT Unemployment Number instantly, followed by a confirmation letter in the mail within 7 days.

Power of Attorney

Power of Attorney upon request, please obtain the prefilled form from your client service representative.

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