Alternative Minimum Tax, though your suggestion works too. It was devised many years ago to hit high-income people who take a lot of deductions. The dollar amounts defining "high income" and "a lot of deductions" have stayed the same through decades of inflation, to the point that many Americans have to pay the higher rate.
no subject
Date: 2018-04-12 06:15 am (UTC)sounds like!
no subject
Date: 2018-04-12 09:53 am (UTC)no subject
Date: 2018-04-13 03:33 am (UTC)But Gary's explanation is correct.