Yesterday morning, my wife came upstairs and told me that NPR had a story about taxes. She also mentioned that it would probably annoy me. (She gets me.) But I decided to turn it on just to see who would be guesting.

One of the guests was Professor Dorothy Brown. Prof. Brown is a friend and a mentor, so I left it on and I’m glad I did. The episode of 1A focused on the racial wealth gap and, to my interests, the place of the federal income tax in causing and exacerbating the wealth gap.

That the tax law treats Black and white taxpayers different isn’t immediately obvious. After all, it’s written in race-neutral language (or, better, it doesn’t mention race at all). And, in fact, it has taken at least two decades of pioneering work by Prof. Brown (and others) to highlight the ways in which the tax law, while facially neutral, has a disparate impact that benefits white taxpayers and harms Black and brown taxpayers.[fn1]

Figuring out ways in which the tax law affects Black taxpayers differently from the ways it affects white taxpayers is no easy task, though. Among other things, the IRS doesn’t collect taxpayers’ races. So Prof. Brown’s research truly requires detective work.