Emergency-related state tax relief available for taxpayers located in twelve northern Michigan counties impacted by March 2025 storms.
EFW2 Error Codes
EFW2 Error Codes
If you have received an error code in Michigan Treasury Online (MTO), enter it into the search bar below to receive an explanation of the error.
Error Codes
| Error Code | Explanation of Error |
|---|---|
| W3500 | The file you are trying to upload is too small to include a wage record or is empty. |
| W3510 | The document you are trying to upload is not in ".txt" format. Documents uploaded in other formats may be re-saved in ".txt" file format and then re-uploaded. |
| W3520 | The file size you are trying to upload is too large. The system is unable to upload a single file larger than 10MB. Try reducing the size by splitting data into multiple files. You can save and upload multiple files. |
| W3530 | The system is unable to upload the file. The system's security is compromised due to infected or unrepaired file. |
| W3540 | An unexpected error occurred during file upload. Please submit your request again. If you continue to receive this message, see "Troubleshooting MTO Error Messages" below. |
| W3550 | An unexpected error occurred during file upload. Please submit your request again. If you continue to receive this message, see "Troubleshooting MTO Error Messages" below. |
| W3560 | An unexpected error occurred during file upload. Please submit your request again. If you continue to receive this message, see "Troubleshooting MTO Error Messages" below. |
| W3570 | Unable to retrieve W2 records data. Please submit your request again. If you continue to receive this message, see "Troubleshooting MTO Error Messages" below. |
Troubleshooting MTO Error Messages
If you repeatedly receive an MTO error message, complete all of the following steps. Be sure to reattempt your MTO transaction after each step:
- Verify you are using an MTO supported web browser: Chrome, Edge, Firefox, Safari
- Log out of the MTO session and exit the browser completely
- Shutdown computer and restart
- Clear browser cache
- Switch web browsers and/or computers if possible
If you continue to receive the error message after completing the steps referenced above, please contact the Treasury Customer Service Center during normal business hours (Monday - Friday, 8:00 am - 4:30 pm EST):
- ESA: 517-241-0310
- Registration and SUW: 517-636-6925