The Wisconsin Department of Revenue has recently released some summary statistics from Wisconsin state income tax returns, covering the years 2014-2019. These data provide insight on the distribution of income and income taxes in the state. In particular, I find that:
1. Reported incomes in Wisconsin have grown across the income distribution from 2014-2019, but the increases have been largest at the low end of the distribution.
2. The state’s income tax is progressive, with a large share of taxes paid by the highest income groups. The degree of progressivity has remained relatively constant since 2014.