There's 2 problems with that. #1: In order to raise enough revenue to support the gov't, the tax rate would be so prohibitively high on the low wage earners that they couldn't survive, and #2: What a person pays into society should be proportional to what they take out of society. Someone who earns cash by the truckload should pay more than someone who earns cash by cupful. Aside from musicians and athletes, no one really gets rich in a vacuum. For everyone else, success is dependent on a good public education system to train employees, infrastructure like roads, rails and airports to ship products, police and fire dept protections for their property and employees, etc. For the 1% to pay the same tax rate as a guy who bags groceries for a living and is just barely getting buy is not a reasonable or equitable solution.