The top 1 % of taxpayers paid 40.4 % of the total income taxes collected by the federal government in 2007. That is still the most recent data we have on this subject.
The share of the tax burden borne by the top 1 % exceeds the share paid by the bottom 95 % of taxpayers combined.
That means that 1.4 million taxpayers pay a larger share of the income tax burden than the bottom 134 million taxpayers.
This data means the United States relies more heavily on the top 10 percent of taxpayers than does any nation and our poor people have the lowest tax burden of those in any other nation.