Media Specifications

W-2 Bulk Upload Application

The Maryland Revenue Administration Division's W-2 Bulk Upload Application allows users (employers/payroll providers) to log in to our bFile system and upload a text file or zipped file in the required EFW2 format. The data can contain W-2 and MW508 information for multiple employers. There are header and footer records that delineate each employer.

The application validates the data in the file using the same rules as required on current magnetic media submissions. Upon successful validation, all of the valid records are accepted. If the validation of the file fails, then records are rejected. The application will then provide an acknowledgment of those records that validated successfully and a listing of all the validation errors for those records that failed validation.

Withholding Reconciliation Application

The Maryland Revenue Administration Division's Withholding Reconciliation Application allows users (employers/payroll providers) to log in to our bFile system and data enter their W-2s and their MW508. This is ideal for companies who have less than 250 W-2s to report.

Diskettes and CDs

All CDs and diskettes must be in EFW2 format, the same as W-2 Bulk Upload. We encourage use of the Bulk Upload Testing Application. This application will allow users to test their ability to upload and transmit their W-2s and MW508s using a text or ZIP file.

  • The Comptroller of Maryland accepts 3½-inch diskettes. Diskettes must be double-sided, double-density or high-density, MS-DOS version or compatible operating system.
  • All diskettes and CDs must be scanned for viruses before submission.
  • Only one file name is allowed. The file name must be W2REPORT for W-2 wage data or IRSTAX for 1099 data. Do not add an extension (e.g., ".dat", ".bak").
  • Data must be in uppercase letters in ASCII.
  • Files may be compressed using PKZIP or WinZip.
  • Please indicate the following information on the external labels:
    • Company name.
    • Federal Employer Identification Number (FEIN).
    • Proper sequence (e.g., Volume 2 of 3).
    • Type of data (W-2 or 1099).
    • If the file is compressed.


Maryland no longer accepts cartridges, tapes or thumb/flash drives.