A closer look at who does (and doesn’t) pay U.S. income tax -- Pew Research Center

As Congress and the White House pivot from trying to repeal the Affordable Care Act to overhauling the U.S. tax code, it's helpful to take a closer look at how the tax system works presently in the context of its recent history. Individual income taxes are the federal government's single biggest revenue source. ....
http://www.pewresearch.org/fact-tank/2017/10/06/a-closer-look-at-who-does-and-doesnt-pay-u-s-income-tax/