WASHINGTON -- One of the most important tools for taxing the wealthiest sliver of Americans is a levy they don't pay with a personal check to the government: the corporate income tax. A new study estimates that nearly 40% of the taxes paid by the 400 wealthiest Americans from 2018 to 2020 came from corporate taxes. The study, conducted with access to anonymized Internal Revenue Service data, attempts to create a comprehensive estimate of income and taxes for the very small group of people on the Forbes 400 list of the wealthiest Americans.