IRS data on the tax shares of the top 1% and the bottom 95% from 1980 to 2015. In the most recent year available (2015), the top 1% of US taxpayers (N = 1.4 million) reported about $2 trillion in adjusted gross income (AGI), which was 20.6% of total taxable income that year, and that group paid $568 billion in federal income taxes or 39% of total taxes collected. The bottom 95% of taxpayers (N = 134 million) earned 64% of total AGI ($6.5 trillion) and paid $588 billion in income taxes (and 40.4% of total taxes paid), which was just slightly more than the taxes paid by the top 1%.
Via AEI