Though UIA will not provide you a sample acknowledgement file, UIA is in the process of building a tool to help Employers and TPAs test file formats, which will be available prior to the launch of MiUI on MiUI University.
In November, UIA will launch a file format validator tool on MiUI University, that allows Employers and TPAs to test whether their quarterly wage reporting files meet MiUI’s file specifications.
The tool will support validation for the four file formats accepted by MiUI:
For more information regarding these file formats please view MiUI University.
After MiUI launches, employers and TPAs will file Wage and Tax Reports in MiUI using their MiUI accounts, and all e-files and data exchange files will be handled within MiUI.
Please see the Quarterly Wage Report Quick Reference Guide on MiUI University for more information.
Please note that, ACH Credit will continue to be available through the e-lockbox, and ACH Debit will continue to be available through CEPAS.
There are four new file formats that will be accepted in MiUI. Detailed information was previously shared in June 2025 and through MiUI University. Employers may need to update existing processes to reflect acceptable file formats. There is no paper form included with e-filing.
Per MCL 4141.4 (2015): All employers shall file quarterly by an electronic method approved by the unemployment agency. An employer that complies with the reporting requirements of this subsection by filing electronically a quarterly wage report using a method approved by the unemployment agency is not required to file periodically to disclose contributions under this act.
There are also new filing methods available within MiUI.
When trying to upload larger files, MiUI will display a message saying, "The uploaded file is larger than the online file upload limit and shall be processed through the overnight batch process. Please check View Submission History the next Business day for results."
For file(s) processed overnight, you will be able to view a confirmation number by 8:00 A.M. EST the next business day on the View Submission History screen, in the Confirmation column.
If the confirmation number is selected, the confirmation file will be automatically downloaded to your computer.
The confirmation file will show results at both the record level and file level and display the number of successfully processed employers. If the file is unable to be processed due to errors, results will only be displayed at the record level. For a TPA who submitted on behalf of multiple Employers, the file will include a breakdown of errors by Employer.
Any file greater than 1,000 records and/or has 5 or more employers will be directed to overnight processing.
For example:
You can test your wage report files via the Wage Report File Validation Tool. This tool will allow you to upload a wage report in your preferred file format and will inform you of any identified issues associated with your submission. If your file is formatted correctly, you will receive a message indicating that you have submitted a valid file.
Users should not upload real employer or employee information to this tool, as internet communication may not be secure.
