Michigan TPA + POA needed

Important
To effectively communicate with tax offices on your behalf, you must grant us Third Party Administrator access and/or Power of Attorney. Each tax office has its own authorization process, and may require different actions for you to take.

Third-Party Agent (TPA) access for the Michigan Department of Treasury

To file and pay your Michigan withholding taxes, it's essential that we have third-party access to your tax account. Submit a request to initiate TPA access, and include the following information:

• Your business name and FEIN as registered with the State of Michigan
• Filing Frequency (Monthly, Quarterly, or Annually)
• Ownership Type (as determined when you registered)
• Registered Taxes for Business (Withholding, sales/use tax, etc.)

• Individual Owner Husband/Wife Proprietorship Partnership Limited Partnership Trust or Estate Investment Club Fraternal Organization Other

  LLC - Sole Proprietor (Form 1040) LLC - Partnership (Form 1065) LLC - C Corporation (Form 1120) LLC - S Corporation (Form 1120-S) LLC - Wholly owned by another entity Michigan C Corporation  Michigan Corporation - Subchapter S Foreign C Corporation Foreign C Corporation - Subchapter S

Power of Attorney (POA) for the Michigan Department of Treasury

1. Download the Michigan DOT POA
2. Complete the following information:
   • Part 1: Taxpayer Information
   • Part 6: Taxpayer Signature
3. Provide OnPay with a copy of your completed form

Download the POA form: 

Michigan DOT POA

Third-Party Access (TPA) for the Michigan Department of Unemployment Insurance

To file and pay your Michigan unemployment taxes, it's essential that you grant us third-party access to your MiUI tax account. 

1. Log into your MiUI account
2. On the Employer Homepage, look for "Associated TPA(s)", and select TPA Authorization
3. Under "Third Party Administrator (TPA) Authorization", select New at the bottom right, leaving all other fields blank
4. Under "Assign Third Party Administrator (TPA)", enter the TPA ID: 50003704, and click Next
5. For "Third Party Administrator (TPA) Information", under "TPA Services Begin
   Date", enter 01/01, and the current year, leaving the end date blank
6. In the "Unassigned Roles" section, select the checkbox for the following roles, and click Save:
   • View Employment and Wage Detail
   • Submit Employment and Wage Detail
   • View Rate Notice and Voluntary Contribution
   • Edit Rate Notice and Voluntary Contribution
   • View Tax Payments
   • Edit Tax Payments and Update and Submit

Providing account information & completed forms

Submit a request and attach completed forms

To provide the information detailed in this article, click Submit a request, and log in using your OnPay credentials. The "Submit a request" form is the most secure way to transmit your company information and documents to us. 

Submit a request

Note: You will need your OnPay login credentials.

You can also submit a request anytime you need help

Requests can also be submitted by clicking the link at the bottom of any help article, or by starting a chat when logged into OnPay. Submitting a support request is the fastest and most secure way to get help with tax matters, technical advice, or any other support you may need from OnPay. 

POA forms to return:

• Michigan DOT POA 500 KB
• Michigan SUI POA 800 KB