Property Assessment Data XML File

January 23, 2024

To: Certified Assessors, Public Assessor List
County Real Property Listers, Treasurers, Clerks, Registers of Deeds
Municipal Clerks and Treasurers

The Wisconsin Department of Revenue (DOR) recently expanded our XML assessment and tax roll web page to include an XML standard data file for property assessment information.

Property Assessment Information

XML Property Assessment Data File (Schema) Development

  • Assessors, municipalities and counties have requested DOR provide a standard statewide assessment data file
  • XML is the nonproprietary format of the property assessment data file
    • XML format satisfies the requirement for assessors to provide municipalities with a non-proprietary format of the municipality's assessment data
    • XML format is consistent with the XML property assessment and property tax roll schema currently used by Wisconsin local governments and Wisconsin property assessment and taxation software vendors
  • Property assessment data file schema was developed in coordination with assessment software vendors that provide services to assessors in Wisconsin. The schema applies the:
    • Standards and codes found in the Wisconsin Property Assessment Manual Vol I and Vol II
    • Recommendations from Wisconsin assessment software vendors


  • Short term – obtain XML schema complaint property assessment data files from Wisconsin assessment software vendors
  • Long term – assessors, municipalities and counties are able to exchange parcel data in a standard non-proprietary format

Steps – DOR: