Today, ProPublica is launching the first in a series of stories based on the private tax data of some of our nation’s richest citizens. We obtained the information from an anonymous source who provided us with large amounts of information on the ultrawealthy, everything from the taxes they paid to the income they reported to the profits from their stock trades... Tax experts have long understood that the wealthiest Americans reap outsized benefits from the federal tax code’s emphasis on taxing income rather than assets like stock holdings and property. Yet, when The New York Times disclosed in 2020 that President Donald Trump had amassed so many deductions he paid no taxes in 11 of 18 years, it was assumed that his case was an anomaly, reflecting the unique breaks real estate developers receive under our tax system. It is now clear that there isn’t just one such taxpayer — there are many, in multiple industries. We believe that disclosing the identities of billionaires who paid little to no taxes in years their fortunes grew by billions of dollars will help readers understand the magnitude of the tax advantages the ultrarich enjoy. We also believe that disclosure of specific figures about the tax returns of people like Jeff Bezos, Michael Bloomberg, Warren Buffett and Elon Musk will deepen readers’ interest and understanding of this complex and arcane subject.