But most adults who pay no income tax do work, and the plan makes no distinctions. “All Americans should pay some income tax to have skin in the game, even if a small amount. Currently over half of Americans pay no income tax,” it states.

Last year, 57 percent of U.S. households paid no income tax, but that was by design. Successive Republican tax cuts, including President Donald J. Trump’s tax cut of 2017, which greatly expanded the standard deduction, took tens of millions of workers off the income tax rolls, though virtually all of them pay Social Security, Medicare and sales taxes.

And for all of Mr. Scott’s evasions, the criticism is not coming just from the “militant left” that he denounced. The nonpartisan Tax Policy Center estimated that ensuring all households pay at least $100 in income taxes would leave families making about $54,000 or less with more than 80 percent of the tax increase. Those making less than about $100,000 would shoulder 97 percent of the cost.