"While average effective tax rates barely changed in the US from 1945 to 2015, the average tax rates of high-income households fell sharply—from about 50 percent to 25 percent for the highest income 0.01 percent and from about 40 percent to about 25 percent for the top 1 percent."
What was the effective tax rate?
"While average effective tax rates barely changed in the US from 1945 to 2015, the average tax rates of high-income households fell sharply—from about 50 percent to 25 percent for the highest income 0.01 percent and from about 40 percent to about 25 percent for the top 1 percent."
https://taxpolicycenter.org/taxvox/effective-income-tax-rate...
For the top 1% and 0.01% the effective tax has been halved from ~50% to ~25%, which is perhaps not very surprising.