Michigan TPA and Power of Attorney required

 Required for OnPay to pay on your behalf 

Third-Party Agent 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

 Required for OnPay to pay on your behalf 

Third-Party Access for the 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. In the left navigation menu, select Account Maintenance
3. Select Maintain Third-Party Administrator (TPA) Authorization
4. Select New at the bottom right, leaving all other fields blank
5. Under "Assign Third Party Administrator (TPA)", enter the TPA ID: 50003704, and click Next
6. For "Third Party Administrator (TPA) Information", under "TPA Services Begin
   Date", enter 01/01, and the current year, leaving the end date blank
7. In the "Unassigned Roles" section, select the checkbox for the following roles:
   • Submit Employment and Wage Detail
   • Edit Tax Payments Update and Submit
   • Edit Rate Notice and Voluntary Contribution
8. Click Save

Reminder
OnPay also needs you to enter your state tax IDs and tax rates in order to properly calculate and remit all state taxes. See all Michigan tax guides→

Forms you may need to complete upon request

You may be asked to take these steps in order for OnPay to communicate with tax offices.

Power of Attorney for the Michigan Department of Treasury

1. Download the Michigan DOT Power of Attorney form
2. Complete the following information:
   • Part 1: Taxpayer Information
   • Part 6: Taxpayer Signature
3. Submit a request and attach a copy of your form

Note: You'll need your OnPay login credentials to submit a request. Trouble logging in?

All forms

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