“Contrary to common perceptions, the CBO data indicate that: (1) income earned after taxes and transfers has increased over the past several decades for all income groups, (2) the federal tax system is progressive and has become more progressive over the past three decades, and (3) the federal system relies heavily on higher earners to raise revenue for government services and means-tested transfers.”
https://www.forbes.com/sites/timworstall/2015/01/08/the-us-t...
I can’t find data before 1980.