MiUI Resources for Employers and TPAs

Maintaining the Same Employer Account

With the launch of MiUI, a new process will exist for maintaining employer accounts as they switch between reimbursing and contributing status. Unlike previous processes, employers will utilize one account regardless of any changes to their reporting method. All functions—whether reimbursing or contributing—will be completed within the same account. A new account number will not be assigned.

The Two System Transition period refers to the time when both MiWAM and MiUI systems will be in use.

Between December 15, 2025 and Summer 2026, tax functionalities will be available in MiUI while benefit functionalities will continue to be accessed in MiWAM.

When to Use MiUI:

• Reports and Payments
  • Manage Reports and Payments
  • Make a Voluntary Payment
  • View Yearly Wage Evaluation
• Account Maintenance
  • View Tax Rate History
  • Request IRS Certification
  • Request Disclosure of Account
  • Submit Notice of Change
  • File Acquisition of Business
  • Apply for Seasonal Designation
• Tax Issues and Assessments
  • Submit Tax Protest or Appeal
  • Request for Waiver
  • Request Clearance of Account

When to Use MiWAM:

• Account Maintenance
  • Request Employment Decision
• Benefit Services
  • View Benefit Charges & Credits
  • Report Employee Payments
  • View Determinations and Decisions
  • Request Seeking Work Waiver
  • Request Waiver Extension
  • Report Refusal of Offer to Work

Retired Functionality:

• Account Maintenance
  • Apply for Michigan Tax Credit

Additional details can be found on our resource guide webpage.

Changes to quarterly wage reporting file formats

There are now four file formats that will be accepted in MiUI. Employers may need to update existing processes to reflect acceptable file formats.

1. Delimited (i.e., CSV Comma Delimited)
   
   • File extensions: .txt or .csv
2. ICESA (NASWA Standard File Format)
   
   • File extensions: .txt
3. EFW2 (Formerly MMREF-SSA)
   
   • File extension: .txt
4. XML (Standard XML Format)
   
   • File extension: .xml

The MiWAM file format will no longer be accepted, employers and / or third-party administrators (TPAs) will need to update existing processes to reflect acceptable file formats. Detailed instructions for each file format can be found linked above or on our resource guide webpage.

Key to the transition is setting up a MiLogin for Business account, which will be required to access MiUI. All users (Employers and Third-Party Administrators (TPAs)) will need a MiLogin for Business account to use MiUI.

• MiLogin for Business is the State of Michigan’s secure portal that lets users access multiple state services using a single User ID and password. Employers and TPAs will be required to use MiLogin for Business to access MiUI.
• After setting up a MiLogin for Business account, employers and TPAs will be able to add MiUI as a service to the account. Note that, while MiUI is a single system, there are two distinct services for MiUI: one for employers and one for TPAs.
• Some employers may already have a MiLogin for Business account if they have interactions with other state departments, such as the Michigan Department of Treasury.
• Understanding MiLogin is crucial as it will be the gateway to the new MiUI system, streamlining access and enhancing security.

At this time, all employers and TPAs should either create a MiLogin for Business account or confirm that they are able to log into their existing account. If an employer or TPA already has a MiLogin for Business account, they do not need to create a new one for MiUI. After logging into MiLogin, employers and TPAs should add MiUI as a service to the account (employers will add the MiUI Employer Portal and TPAs will add the MiUI Agent Portal).

• To log in or create an account, visit the MiLogin for Business website.
• Additional information on MiLogin for Business can be found in the Step-By-Step Guide posted on MiUI University. 
• For questions regarding MiLogin for Business, visit the MiLogin for Business Help page or contact the Office of Employer Ombudsman at MiUIEmployerSupport@Michigan.gov or call 1-855-484-2636 and select Option

TPA Roles and Access: Third-Party Administrators (TPAs) can be Professional Employer Organizations (PEOs), Fiscal Intermediaries (FIs), Employer Representatives, Reimbursing Employer Groups or Work Opportunity Tax Credit (WOTC) representatives. TPAs are authorized by employers to perform specific unemployment insurance tasks.

Employer Control: MiUI gives employers complete control over their accounts and TPA relationships. Employers can add, update, or remove TPAs and assign specific roles to limit access to only the necessary information and tasks. 

• Employers may add a TPA at any time; however, both the start and end dates of the TPA’s role must align with the beginning of a new quarter.

TPA Roles: TPAs are authorized by employers to perform specific unemployment insurance tasks. The available TPA roles in MiUI include:

• Edit Account Maintenance 
• View Account Maintenance 
• Edit Benefit Charges 
• View Benefit Charges 
• Edit Claims Forms Mailing 
• Edit Tax Payments Update and Submit 
• View Tax Payment 
• Submit Employment and Wage Detail 
• View Employment and Wage Detail 
• Edit Rate Notice and Voluntary Contribution 
• View Rate Notice and Voluntary Contribution 
• WOTC Update and Submit 
• WOTC View Only