Average effective tax rates, number of tax returns, total adjusted gross income, and total tax after credits, for highest AGI groups, 1945 to 2020.

Number of households, average pretax and after-tax income, shares of pretax and after-tax income, and income category minimums for households with children, by comprehensive household income quintile.

Amounts of realized capital gains, taxes paid, average effective tax rates, and maximum tax rate on long-term capital gains, for tax years 1954 to 2014. Data unavailable for recent years.

Number of households, average pretax and after-tax income, shares of pretax and after-tax income, for elderly headed households, by comprehensive household income quintile.

Number of households, average pretax and after-tax income, shares of pretax and after-tax income, for nonelderly childless households, by comprehensive household income quintile.

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

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

Historical itemized charitable contributions (nominal amounts) and adjusted gross income, 1917-2017.

Sources of income, adjustments, and itemized deductions for returns with itemized deductions, by size of adjusted gross income.