Bolstering demands for a global minimum tax to rein in corporations’ evasive tactics, a new analysis released Monday showed that a half dozen companies based in the United States paid almost $100 billion less in taxes over the past decade than stated in their annual reports.

Between 2011 and 2020, Amazon, Facebook, Alphabet (the owner of Google), Netflix, Apple, and Microsoft—known as the “Silicon Six”—paid roughly $219 billion in income taxes, which amounts to just 3.6% of their more than $6 trillion in total revenue, according to the Fair Tax Foundation. Income tax is paid on profits, not total revenue, and researchers said these tech giants are adept at reducing their tax liabilities by shifting profits to offshore tax havens.

Had the “Silicon Six” paid the prevailing tax rates in the countries in which they operate, they would have given global tax authorities over $149 billion more than they did over […]