Massachusetts

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Agency Information

Massachusetts Department of Revenue – Withholding Tax
Massachusetts Department of Unemployment Assistance – Unemployment tax

Add to existing company setup

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

  • Withholding – Withholding account number and Deposit Frequency.  If you’re unsure of your deposit frequency or account number you can call the agency at 617-887-6367.
  • Unemployment – Account Number and Tax rate.  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 617-626-5075.
  • Third Party Access – All clients are required to add permissions in order for us to file and pay taxes on your behalf.  Please review the Third Party Registration and/or Power of Attorney Instruction section below.

 

Register a new company

Massachusetts Department of Revenue 

Employers can register online at https://mtc.dor.state.ma.us/mtc/_/.  Under the Quick Links section select Register a new taxpayer.  Then select Register a business.  Follow the prompts to register your business.  Once completed you will receive your account number and deposit frequency.

 

Massachusetts Department of Unemployment Assistance

Register online at http://www.mass.gov/lwd/unemployment-insur/employers/.  Select Employer Login at the bottom of the page to begin.  Then select Employer Registration at the top left of the page.  Once completed you will receive your account number and rate.

Third Party Registration and/or Power of Attorney Instructions

Massachusetts Department of Revenue

  1. Go to: https://mtc.dor.state.ma.us/mtc/_/#3
  2. Click on Settings.
  3. Under I want to: Select Assign Access Rights to a Third Party.
  4. Search/Type the company name provide by your service team.

Massachusetts Department of Unemployment Assistance

  1. Go to: www.mass.gov/uima
  2. Scroll down and select Employer Login.  Login to your account – any issues contact (617) 626-5075 for assistance.
  3. Select Account Maintenance.
  4. Select Third Party Administrator (TPA) Authorization.
  5. Select New.
  6. Enter TPA ID provided to you from your service team.
  7. Enter Start dates.
  8. Check ONLY the boxes below for the following Roles:
    • Account Maintenance Update and Submit
    • Payments Update and Submit
    • Employment & Wage Detail Update and Submit
  9. Save.