World Tax Revenue Chart
Current World Tax Revenue: 14.94% GDP
World Tax Revenue for Dec 2016
Mean: 14.19% GDP
Median: 14.16% GDP
Min: 13.16% GDP (Dec 1975)
Max: 15.62% GDP (Dec 2000)

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

Source: World Bank > World > World Tax Revenue