Massachusetts Employer Tax Information

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.

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 (UI) Contribution Rate

If you are unsure of your rate, contact the agency at 617-626-5075 or visit the MA Department of Unemployment Assistance website. See additional instructions below on how to locate your rate. 

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 the MA Department of Unemployment Assistance website.

Massachusetts Covid-19 Recovery Assessment Rate

• The Covid-19 Recovery Assessment rate is assigned to employers based on the business' UI contribution rate. Once you receive your UI rate, you can look up your Covid-19 Recovery Assessment rate by logging in to your UI online account. Learn more on the MA Department of Unemployment Assistance website.

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 the MA Department of Unemployment Assistance website.

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 the MA Department of Unemployment Assistance website.

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 the MA Department of Unemployment Assistance website.

Massachusetts Covid-19 Recovery Assessment Rate

• The Covid-19 Recovery Assessment rate is assigned to employers based on the business' UI contribution rate. You can look up your Covid-19 Recovery Assessment rate by logging in to your UI online account. Learn more on the MA Department of Unemployment Assistance website.

Massachusetts Payroll Tax Details

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

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

  • 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.

Massachusetts Paid Family Medical Leave

Square Payroll supports MA Paid Family and Medical Leave (MA PFML) premium calculations, withholdings, payments, and reporting. Learn more about the the Square Payroll settings for MA Paid Family Medical Leave.