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Connecticut Employer Tax Information

To sign up for Square Payroll in Connecticut, you must be registered with the Connecticut Department of Revenue Services and the Connecticut Department of Labor.

Agency Tax ID Tax ID Format
Connecticut Department of Revenue Services Connecticut Tax Registration Number (X)XXXXXXXX XXX (typically 9 digits with a 3 digit location code)
Connecticut Department of Labor Connecticut Department of Labor Employer Registration Number XX-XXX-XX (7 digits)

Connecticut New Employer Registration

Connecticut Department of Revenue Services

  1. Register online.

  2. Allow approximately 10 business days to receive your Connecticut Tax Registration Number.

  3. If you need to speak with the Department of Revenue Services, call: 860-297-5962

Connecticut Department of Labor

  1. Register online.

  2. Upon successful completion of online registration, you will receive your Department of Labor Employer Registration Number.

  3. If you have issues, call the Department of Labor: 860-263-6000

Connecticut Contribution Rate

Your rate is the sum of the Employer Tax Rate and the Connecticut Fund Solvency Tax Rate. Follow additional instructions below if you are unsure of your rate or if you need to apply for one.

Find Your Connecticut Tax ID Numbers and Rate

Connecticut Tax Registration Number

  1. Locate your twelve-digit (XXXXXXXXX XXX) registration number on any previously filed state tax return (Form CT-941) or correspondence from CT Department of Revenue Services.

  2. Call the Department of Revenue Services: 860-297-5962

Connecticut Department of Labor Employer Registration Number

  1. Locate your seven-digit (XX-XXX-XXX) registration number on any previously filed quarterly report (Form UC-5A / UC-2R) or correspondence from the Department of Labor.

  2. If you can’t find your locate your Department of Labor Employer Registration Number, you may fax a request to the Employer Status Unit at (860) 263-6567. See specific fax requirements here.

  3. If you have issues, call the Department of Labor: 860-263-6000

Connecticut Contribution Rate

  1. Your rate is the sum of the Employer Tax Rate and the Connecticut Fund Solvency Tax Rate.

  2. If you have an online account, look up your rate online.

  3. Locate your rate on any previously filed quarterly report (Form UC-5A/UC-2R) or on the Merit Rating Notice that the CT Department of Labor mails each December.

  4. Call the Department of Labor: 860-263-6000

You are responsible for ensuring Square Payroll has the correct Contribution Rate on file for your business. If you need to update your rate, you can do so from the Tax Info tab in your online Square Dashboard.

Connecticut State Tax Details

Square Payroll processes the following per the frequency below to the listed state agencies:

Note: Note: Square Payroll remits CT withholding tax payments at the more frequent semi-weekly deposit schedule.
Agency Name Frequency
Department of Revenue Services Withholding Tax Payment Per Pay Run
Quarterly Reconciliation of Withholding (CT-941) Quarterly
Annual Reconciliation of Withholding (CT-W3) Annually
Annual Wage and Tax Statements (CT-W2) Annually
Department of Labor Employer Contribution Return and Employee Quarterly Earnings Report (UC-5A / UC-2) Quarterly
Unemployment Insurance Tax Payment Quarterly
New Hire Report Per New Employee

Additional Connecticut Specific Information

  • Connecticut Tax Registration Number: Your Connecticut Tax Registration Number may be either 10 or 11 digits.

Learn how to locate or obtain an EIN.