"Congress re-adopted the [first modern] income tax in 1913, levying a 1% tax on net personal incomes above $3,000, with a 6% surtax on incomes above $500,000." https://en.wikipedia.org/wiki/History_of_taxation_in_the_Uni...

(1913 $3k -> roughly $80k 2020 in standard inflation adjustments. At a time when a recent-graduate civil engineer made ~$1k, or with 10 years experience in the low $2k's, according to https://libraryguides.missouri.edu/pricesandwages/1910-1919. A person making $3k was loaded.)