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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, Samsung Internet
  • 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 am - 4:30 pm EST):

  • ESA: 517-241-0310
  • Registration and SUW: 517-636-6925