Average and marginal employee Social Security and Medicare (FICA) tax rates for two-parent families of four at the same relative positions in the income distribution from 1955 to 2015.
Average effective tax rates for the 400 individual income tax returns reporting the highest adjusted gross income (AGI) each year. The IRS discontinued this data series after tax year 2014.
Marginal tax rates for the 400 individual income tax returns reporting the highest adjusted gross income (AGI) each year. The IRS discontinued this data series after tax year 2014.