The 2016 edition of the OECD’s annual Revenue Statistics publication shows that the OECD average tax-to-GDP ratio rose slightly in 2015, to 34.3%, compared to 34.2% in 2014. This is the highest level since the Revenue Statistics series began in 1965. An increase in tax-to-GDP levels was seen in 25 of the 32 OECD countries that provided preliminary data in 2015, while tax-to-GDP levels fell in the remaining seven countries.
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Data Source: OECD Revenue Statistics 2016