Politicians who preach class warfare repeatedly assert that we need higher taxes on “the rich.”

Indeed, that’s been the biggest political issue (and oftentimes biggest economic issue) in every recent tax fight (the Trump tax reform and Obama’s fiscal cliff), as well as the issue that generates the most controversy when discussing tax reform.

So it seems almost inconceivable that the class-warfare crowd would support a change to the tax code that would only benefit the top 10 percent, right?

Yet, that’s exactly what’s happening in the fight over the deduction for state and local taxes.

Democrats want to restore an unlimited deduction, thereby enabling people to shield more of their income from tax. But, as the Tax Foundation notes, that change only produces benefits for upper-income taxpayers.

Itemized deductions such as the SALT deduction are mostly utilized by higher-income individuals. As such, any change to the SALT deduction will chiefly impact them. In addition, the value of a deduction increases as a taxpayer’s statutory tax rate increases. A deduction against the top rate of 37 percent is more valuable than a deduction against the 32 percent tax rate. We estimate that eliminating the SALT deduction cap would have no impact on taxpayers in the bottom two income quintiles and a negligible impact on taxpayers in the third and fourth quintiles. …However, taxpayers in the top 5 and 1 percent of income earners would see an increase in after-tax income of 1.6 percent and 3.7 percent respectively.

And if restoring the deduction is “paid for” by raising the corporate tax rate, the net effect is to raise taxes on the bottom 90 percent in order to give a tax to top 10 percent.

Or, to be more precise, to give a tax cut to the top 1 percent.

Some of you may be thinking that the Tax Foundation leans right and therefore can’t be trusted.

So let’s look at some research from the Tax Policy Center, which is a joint project of the left-leaning Urban Institute and left-leaning Brookings Institution.

Only about 9 percent of households would benefit from repeal of the Tax Cuts and Jobs Act’s (TCJA) $10,000 cap on the state and local property tax (SALT) deduction, and more than 96 percent of the tax cut would go to the highest-income 20 percent of households… For all middle-income taxpayers, the average tax cut would be $10. Those in the top 1 percent would pay an average of $31,000, or 2 percent of after-tax income, less.

And here’s the TPC chart showing how almost all the tax relief goes to upper-income taxpayers.

So what’s going on? Why are Democrats fighting for an idea that would give the rich a $31,000 tax cut while only providing $10 of relief for middle-class taxpayers?

The simple answer is that they think the loophole is a very valuable way of facilitating higher taxes and bigger government at the state and local level. And they’re right, so I don’t blame them.

But it’s nonetheless very revealing that they are willing to jettison their tax-the-rich rhetoric when it interferes with their make-government-bigger agenda.

P.S. This “SALT” debate strikes me as being similar to the Laffer-Curve debate, which requires folks on the left to choose whether it’s more important to punish rich people or to get more revenue to spend.

This article is reprinted with permission from International Liberty.