HI revenue and tax rates as a percentage of OASDI from 1966 to 2009.
share of wages paid in income and payroll taxes for selected years from 1970 to 2011.
historical combined income and employee tax rates for two-parent families of four, also including employer tax rates, 1955-2014.
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 2014.
benefits included in gross income, by filing status and income.