ProPublica is a nonprofit newsroom that investigates abuses of power. The Secret IRS Files is an ongoing reporting project. Sign up to be notified when the next installment publishes. In 2007, Jeff Bezos, then a multibillionaire and now the world’s richest man, did not pay a penny in federal income taxes. He achieved the feat again in 2011. In 2018, Tesla founder Elon Musk, the second-richest person in the world, also paid no federal income taxes. Michael Bloomberg managed to do the same in recent years. Billionaire investor Carl Icahn did it twice.