US Tax Revenue Chart
Current US Tax Revenue: 11.42% GDP
US Tax Revenue for Dec 2015
Mean: 10.86% GDP
Median: 10.83% GDP
Min: 7.94% GDP (Dec 2009)
Max: 12.93% GDP (Dec 2000)

US tax revenue (percent of GDP). Excludes most social security contributions.

Source: World Bank > US > US Tax Revenue