Historical highest marginal personal income tax rates, 1913 to 2020.

Historical itemized charitable contributions as total amount (constant dollars), percent of AGI, and percent of GDP, 1917-2017.

Percent of total returns in each tax bracket.

Adjusted gross income, exemptions, deductions, and tax items.

Marginal tax rate and each rate at which the tax is computed.

Average federal tax rates for nonelderly childless households, by comprehensive household income quintile, 1979 to 2016.

Number of households, average pretax and after-tax income, shares of pretax and after-tax income, and income category minimums for nonelderly childless households, by household income category,1979-2016.

Average federal tax rates for households with children, by comprehensive household income quintile, 1979 to 2016.

Historical percentage of individual income tax returns, classified by the highest applicable statutory marginal rate, 1958-2016.