Before the Internal Revenue Code was changed, the full amount that Americans paid in property taxes, sales taxes and income taxes to localities and states was deductible on their 1040s. But in 2017, Trump and the GOP-controlled Congress, to help pay for their tax cuts, targeted this SALT deduction.

At first, it was going to be totally wiped out, punishing people in higher-taxed states like New York, California, New Jersey and Illinois (all states that favor Democrats).