TAXING THE RICH: THE FACTS:

The top 5%, top 1% and top 0.1% of Americans have been getting a bigger slice of all the income and paying a growing share of federal taxes.
Average tax rates have come down for everyone. On average, the tax bite on the rich is bigger—except for those whose income mainly comes from capital gains and dividends.
The share of taxes paid by the bottom 40% of the population has been shrinking along with their share of income.
The tax system narrows the gap between economic winners and losers, but not enough to stop the gap from widening.

Much more at the link.