NBER: Matching the Forbes 400 to tax data finds that they pay a total tax rate of 24 percent of economic income, lower than the 30 percent tax rate paid on average in the US, from Akcan S. Balkir, Emmanuel Saez, Danny Yagan, and Gabriel Zucman https://www.nber.org/papers/w34170

Matching the Forbes 400 to tax data finds that they pay a total tax rate of 24 percent of economic income, lower than the 30 percent tax rate paid on average in the US, from Akcan S. Balkir, Emmanuel Saez, Danny Yagan, and Gabriel Zucman nber.org/papers/w34170