Those making $50,000 to $100,000 for example, paid just three-fourths of 1 percentage point less of their incomes to our federal government. People making $2 million to $2.5 million saw their effective tax rate fall by about three times that much.

Now let's compare two groups, those making $50,000 to $100,000 and those declaring $500,000 to $1 million. The second group averaged nine times as much income as the first group in 2018.

Under the Trump tax law, the first group's annual income taxes declined on average by $143, while the second group's tax reduction averaged $17,800. Advertisement:

Put another way, a group that made nine times as much money enjoyed about 125 times as much in income tax savings.

This disparity helps explain Trump's support among money-conscious high-income Americans. But given the tiny tax benefits for most Americans, along with cuts in government services, it is surprising Trump enjoys significant support among people making less than $200,000.