Here's the documentation on the corporate-tax-as-a-%-of-GDP info:
http://www.oecd.org/dataoecd/48/27/41498733.pdf [[see page 2)
I want to make clear that I realize there is more than one way to look at the corporate tax burden, and this one may not be the fairest/most appropriate either. However, because so many tricks can be played with corporate income, it isn't easy to figure out what a fair comparison is. There are a number of ways in which the US system is messed up--for instance we are the only significant country that taxes our corporations' overseas earnings. Most countries tax operations in their own territory, but ignore income from other countries, which is why a lot of companies with major foreign income domicile in other countries.
Just like the personal income tax, the corporate income tax could use some serious reform.
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