Billionaires like Jeff Bezos, Warren Buffett, Elon Musk and George Soros benefit from a complex web of loopholes in tax code. The 25 richest Americans, including Jeff Bezos, Michael Bloomberg and Elon Musk, paid relatively little — and sometimes nothing — in federal income taxes between 2014 and 2018, according to an analysis from the news organization ProPublica that was based on a trove of Internal Revenue Service tax data. The analysis showed that the nation’s richest executives paid just a fraction of their wealth in taxes — $13.6 billion in federal income taxes during a time period when their collective net worth increased by $401 billion, according to a tabulation by Forbes. The documents reveal the stark inequity in the American tax system, as plutocrats like Mr. Bezos, Mr. Bloomberg, Warren Buffett , Mr. Musk and George Soros were able to benefit from a complex web of loopholes in the tax code and the fact that the United States puts its emphasis on taxing labor inc...