Withholding Tax Tables Revised. Under authority of Governor Scott Walker, the Wisconsin Department of Revenue has revised the withholding tax tables for payroll periods beginning on or After April 1, 2014. The updated withholding tables are found in the Wisconsin Withholding Tax Guide: http://www.revenue.wi.gov/pubs/pb166.pdf. It is important to note, individuals can adjust their withholding levels by filling out a Form WT-4 and/or a WT-4A and submit that to their employer for payroll.