Credit: Lisa Larson-Walker/ProPublica. Photos: Elon Musk (Tristar Media/Getty Images), Jeff Bezos (Mandel Ngan/AFP via Getty Images), Michael Bloomberg (Joshua Lott/AFP via Getty Images), Warren Buffett (Taylor Hill/FilmMagic/Getty Images) Regulation The Secret IRS Files: Trove of Never-Before-Seen Records Reveal How the Wealthiest Avoid Income Tax