Tax revenues in advanced economies plateaued in 2018, with almost no change seen since 2017, according to the OECD.

This ends the trend of annual increases in the tax-to-GDP ratio seen since the 2008 financial crisis.

The 2019 edition of the OECD’s annual revenue statistics publication shows the OECD average tax-to-GDP ratio was 34.3 percent in 2018, practically unchanged since the 34.2 percent reported in 2017.

Reforms to personal and corporate taxes in the US prompted a significant drop in tax revenues, which fell from 26.8 percent of GDP in 2017 to 24.3 percent in 2018. This led to corporate income tax re...