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New company registration in Massachusetts

Income tax withholding

Go to the MassTax Connect website and do the following:

  1. Click on Register a new taxpayer.  
  2. Click on Register a business.
  3. Click Next.
  4. Select I am registering a business, organization, or other entity.
  5. Click Next, and follow the remaining instructions to register for employer withholding.

After you register with the DOR, you will receive an account ID and deposit schedule. The DOR accepts both your FEIN and another format (WTH-000...). Gusto will use your FEIN. If you have questions about this process, contact the DOR at (617) 887-6367.

Troubleshooting withholding registration issues

If you've signed up for an account on MassTaxConnect but haven’t yet registered for withholding or been assigned a WTH account ID:

  1.  Log in to your MassTaxConnect account.
  2. Click the Add an account type/new location hyperlink under the 'I Want To' section.
  3. All tax types available will be listed, select Employer Withholding tax

If you already have a Massachusetts withholding account number that starts with a “WTH,” but you haven't had active payrolls in Massachusetts recently, you may need to call the DOR at (617) 887-6367, Option 4, to reactivate your WTH Account ID. 

If you have questions about this process or if you’re unsure if someone from your company has already registered for a withholding account number, please contact the DOR at (617) 887-6367, Option 4, for assistance.

Unemployment tax

Go to the DUA website, click on Employer UI Online login and then Employer Registration on the top left. Once you have registered, you should instantly receive a UI Account Number and a UI Contribution Rate. When entering your UI Contribution Rate, please do not include the Workforce Training Rate.

For more guidance, follow the DUA’s step-by-step instruction guide. For 2018, the rate ranges from 2.946%–7.116% with a wage base of $15,000. If you're unsure about your rate, it is best to call the agency at (617) 626-5075.

Add Gusto as a Third Party Administrator (TPA)

This step is required for all Gusto clients, and gives us the permission to file and pay taxes on your behalf. It only takes a few minutes and is completed 100% online. Please follow the instructions:

  1. Go to the DUA online system.
  2. Click on Log In to UI Online for Employers. Log in with your User ID and password.

  3. Click on the Third Party Administrator (TPA) Authorization link on the bottom right corner of the screen.

  4. Click New at the bottom of the screen, and input Gusto’s TPA ID: 102976.
  5. Choose today’s day as the "Beginning Date", and leave "End Date" blank.
  6. Click Add Roles and select:
    • Account Maintenance, Update and Submit
    • Payments, Update and Submit
    • Employment and Wage Detail, Update and Submit
    • EMAC Supplement View Only 
    • Please DO NOT select Gusto for any of the following roles: 
    • Benefit Charges Protest Submission
    • Wage and Separation Mailing
    • Any View Only Roles Account Maintenance, Update and Submit

For further details, follow the DUA’s step-by-step instruction guide. To contact the DUA call (617) 626-5075. 

Troubleshoot Labor and Workforce Development authorization issues 

Some agencies require special authorization for Gusto to pay or file your taxes.

To ensure successful authorization, please verify that the following information you have entered into Gusto matches what is on file with the Massachusetts Labor and Workforce Development:

  • Official company name/address
  • FEIN - Federal Employment Identification Number
  • Unemployment Account Number

Please make sure you have also assigned us the necessary roles as a Third Party Administrator. See step 5 of "Add Gusto as a TPA" above. If Gusto is having trouble gaining access to your account, please verify that the above information matches exactly what the agency has on file by giving them a call at (617) 626-5075.

Massachusetts Employer Medical Assistance Contribution (EMAC)

Massachusetts (EMAC) is an additional contribution that some Massachusetts employers must pay. Learn if your company is subject to EMAC here.

EMAC Supplement

Effective 1/1/2018, Massachusetts created an supplemental EMAC tax. This is an employer-paid tax that is assessed after quarterly Massachusetts unemployment tax returns for SUI/EMAC have been filed.

Massachusetts employers may be liable for the EMAC supplement if they meet the following criteria:

  • Have more than 5 employees AND
  • Have any non-disabled employees who obtain health insurance from MassHealth (excluding the premium assistance program) OR
  • Have any non-disabled employees who receive subsidized coverage through the Massachusetts ConnectorCare program

The supplemental tax equals 5 percent of wages for affected employees, up to a maximum of $750 per employee, per year. You can log in to the DUA Quest system to view your quarterly account balance, including the EMAC Supplement (if applicable).