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Massachusetts Employer Tax Information

To sign up for Square’s servicios de nómina en línea 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 Covid-19 Recovery Assessment X%

Massachusetts New Employer Registration

Massachusetts Withholding Account Number & Deposit Frequency

  1. Regístrese en línea 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. Regístrese en línea 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 buscar en línea 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

Massachusetts Unemployment Insurance Contribution Rate

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 en línea 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

Massachusetts Payroll Tax Details

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

Agencia Declaración Frecuencia
Departamento de Hacienda (DOR) de Massachusetts Pago de impuestos retenidos Después de cada proceso de pago
Declaración del impuesto sobre la renta retenido del empleador (M-941) Mensual/trimestral/anual
Reintegro de licencia médica y familiar paga Trimestral
Declaración de salarios e impuestos (W-2) Anual
Informe de nueva contratación Según sea necesario
Departamento de Asistencia por Desempleo (DUA) de Massachusetts Pago de seguro de desempleo Trimestral
Informe de detalles de empleo y salario Trimestral

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 estas instrucciones from the MA Department of Unemployment Assistance to authorize us.

The whole process can be completed en línea 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 Programa pago de licencia médica familiar de MA.

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