The Wisconsin Department of Revenue provides files containing the data necessary for persons to determine the proper Wisconsin state, county, and stadium sales and use taxes that are due on a particular transaction. These files are designed for use in the user's own system. The files are in the format and layout required by the Streamlined Sales Tax Governing Board (SSTGB), as explained in the
Rate and Boundary Database Instructional paper, that was approved by the members of the Streamlined Sales Tax Project (SSTP).
The rate files contain the Wisconsin state, county, and stadium sales and use tax rates that are applicable to a particular taxing jurisdiction, based on each taxing jurisdiction's Federal Information Processing Standards (FIPS) code and the boundary files identify the FIPS code for each 5 and 9-digit zip code.
Wisconsin updates its rate and boundary files on a monthly basis to give persons as much notice as possible of upcoming changes. However, retailers are only required to update their rate and boundary files on a quarterly basis. The last 4 months of Wisconsin's rate and boundary files, along with their effective dates, are available below.
The current Wisconsin rate and boundary database files are also available on the
Streamlined Sales Tax Governing Board's website.