Earlier quoted context omitted.
If your marginal tax rate is approximately constant, then it will also approximately equal your overall ratio of tax/income. So even though the article doesn't seem to be particularly careful with the difference, it doesn't really matter in this case.
The numbers don't add up to the macro numbers, though--- the governments at all levels added together pull in about 25-30% of U.S. GDP in taxes, not 40%. One thing throwing off his numbers is that he assumes all income to be ordinary income, whereas a large proportion of Americans' income, especially at the high end, get classified as capital gains or qualified dividends, which are taxed at lower rates. I believe War…
Warren really like to talk that crap up about how he pays less taxes than his secretary. To me his secretary just needs a better tax guy.