Earlier quoted context omitted.
https://fred.stlouisfed.org/series/FYFRGDA188S Federal Receipts as a Percent of GDP measures total government revenue relative to the size of the economy, serving as a standardized way to track the federal tax burden over time. Although the top marginal tax rate in the 1950s indeed exceeded 90%, federal receipts hovered around 17% of GDP; this was nearly identical to current levels, because loopholes and high income…
The total tax intake is fairly unambiguous. Personal tax bill for the vast majority of people is also quite clear. But when you get to the top 0.1% or whatever it is, things like "income" and "tax" get ambiguous. I suppose a lot of the ultra rich don't have much earnings, at best cap gains, and even that can be offset, boxed and off-shored ad nauseam. Maybe instead of looking at the ultra rich we could look at what G…
But the denominator isn't "income", it's GDP. That's far harder to "offset, boxed and off-shored ad nauseam".