The giant flaw in Trump’s tax plan

To cut taxes on businesses, middle-class families and the wealthy, President Donald Trump’s tax plan relies on the elimination of key deductions that cost the federal Treasury many billions of dollars each year. Getting rid of those giveaways, in theory, will provide new federal revenue that will help offset the revenue loss that will come from lowering rates.

In principle, tax experts support the idea of a cleaner tax code with lower rates and fewer ways for people to reduce what they owe. But tax breaks tend to be popular and notoriously hard to roll back once they’re in place. And the biggest tax break Trump wants to kill — the deduction for state and local taxes, known as the SALT deduction — might just be impossible to kill.

Republicans have targeted the SALT deduction for elimination for a couple key reasons. First, it costs Washington roughly $100 billion per year in foregone revenue — a large sum that would provide a lot of headroom for other tax cuts if captured. Second, the SALT deduction disproportionately benefits residents of blue states that tend to vote Democrat. So taking it away would affect Dems more than Republicans. That supposedly makes it one of the safest ways Republicans who control Congress and the White House can effectively raise taxes on some voters, while suffering minimal electoral harm.

President Donald Trump speaks to the National Association of Manufactures at the Mandarin Oriental hotel, Friday, Sept. 29, 2017, in Washington. (AP Photo/Evan Vucci)

This is lousy logic, however, and a closer look at the numbers reveals a giant flaw in the strategy of placing the burden of tax reform disproportionately on residents of Democratic states. The SALT deduction doesn’t benefit Democratic states more just because they’re blue. It’s simply more popular in states with higher incomes and higher taxes, because it makes more sense to claim the deduction in such states. Those states tend to vote Democrat, but tax filers claim the SALT deduction in every state — including swing states that will be key to winning future elections.

Who claims SALT

In eight of 11 swing states, more than 20% of filers claim the SALT deduction, according to Internal Revenue Service data analyzed by Yahoo Finance. In two of those states — Colorado and Virginia, the portion of filers claiming the SALT deduction is higher than it is in true-blue New York. Here’s 2015 data showing the portion of filers claiming the SALT deduction in the 11 states generally considered up for grabs in presidential elections, with New York and California as a basis for comparison.