To sign up for Square’s online payroll services in Massachusetts, you must be registered with the Massachusetts Department of Revenue (DOR) and Massachusetts Department of Unemployment Assistance (DUA) so we can pay and file your state taxes.

Agency Required Tax Information Format
Massachusetts Department of Revenue (DOR) Massachusetts Withholding Account Number WTH-00000000-000 (11 digits)
Massachusetts Deposit Frequency Depository (Weekly), Monthly, Quarterly, or Annual
Massachusetts Department of Unemployment Assistance (DUA) Massachusetts Employer Account Number 00000000 (8 digits)
Massachusetts Contribution Rate X%
Massachusetts Employer Medical Assistance Contribution (EMAC) Rate X%

Massachusetts New Employer Registration

Massachusetts Withholding Account Number & Deposit Frequency

  1. Register online as a new business.
  2. You will receive your Withholding Account Number and Deposit Frequency immediately after completing the registration online.

Massachusetts Employer Account Number

  1. Register online as a new business.
  2. You will receive your Employer Account Number immediately after completing the registration online.

Massachusetts Unemployment Insurance Contribution Rate

Most new employers are assigned a Contribution Rate of 1.87%. If you are unsure, contact the agency at 617-626-5075 or visit www.mass.gov.

Massachusetts Employer Medical Assistance Contribution (EMAC) Rate

  • Most new employers are exempt from Employer Medical Assistance Contributions for two years.
  • If you’re unsure, contact the agency at 617-626-5075 or visit www.mass.gov.

Find Your Massachusetts Tax ID Numbers and Rates

Massachusetts Withholding Account Number & Deposit Frequency

  • You can look this up online or on any previous correspondence from the MA Department of Revenue.
  • If you’re unsure, contact the agency at 617-887-6367.

Massachusetts Employer Account Number

  • Look this up online or on previous Rate Notices received from the agency.
  • If you’re unsure, contact the agency at 617-626-5075 or by visiting www.mass.gov.

Massachusetts Unemployment Insurance Contribution Rate

  • Look this up online or on the Rate Notice mailed by the MA Department of Unemployment Assistance each year.
  • If you’re unsure, contact the agency at 617-626-5075 or visit www.mass.gov.

Massachusetts Employer Medical Assistance Contribution (EMAC) Rate

  • Most employers are exempt from Employer Medical Assistance Contributions for two years. After that, employers are assigned a rate based on the number of years they have been in business. If you are liable, you can look up your rate online or on the Rate Notice mailed by the MA Department of Unemployment Assistance each year.
  • If you’re unsure, contact the agency at 617-626-5075 or visit www.mass.gov.

Massachusetts Payroll Tax Details

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

Agency Filing Frequency
Massachusetts Department of Revenue (DOR) Withholding Tax Payment After Every Pay Run
Employer’s Return of Income Taxes Withheld (M-941) Monthly / Quarterly / Annually
Wage and Tax Statement (W-2) Annually
New Hire Report As Needed
Massachusetts Department of Unemployment Assistance (DUA) Unemployment Insurance Payment Quarterly
Employment and Wage Detail Report Quarterly

Adding Square Payroll as your Unemployment Insurance (UI) Tax Administrator

In order to file and pay your Massachusetts unemployment insurance taxes, Square Payroll needs to be authorized as your Third Party Administrator (TPA).

Please follow these instructions from the MA Department of Unemployment Assistance to authorize us.

The whole process can be completed online and you will need the following information:

  • Square Payroll’s Massachusetts UI TPA ID: 105349
  • Roles to assign to Square Payroll:
    • Account Maintenance Update and Submit
    • Payments Update and Submit
    • Employment and Wage Detail Update and Submit

Please note that you will need to unauthorize any previous agents/payroll providers who had the above roles.

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