I can't figure out why, but it seems to have been a standard for a long time: https://www.irs.gov/statistics/soi-tax-stats-top-400-individual-income-tax-returns

I can't figure out why, but it seems to have been a standard for a long time: https://www.irs.gov/statistics/soi-tax-stats-top-400-individual-income-tax-returns-with-the-largest-adjusted-gross-incomes https://www.irs.gov/statistics/soi-tax-stats-top-400-individ...