n 2003, Wisconsin state income taxes paid by filers with incomes in the $35,000-$75,000 range were higher than in many other states. For single filers with incomes in this range, Wisconsin’s income taxes were among the top 10 nationally. For married, joint filers, Wisconsin ranked from 11th to 15th, depending on income. These are several of the findings in a detailed new study of income taxes nationwide published by the Wisconsin Taxpayers Alliance (WISTAX).