Lex Anteinternet: The History of Income Tax Brackets.: Early cartoon view of the restored income tax. Federal Individual Income Tax Rates History Really interesting history of income tax ...Yes, Tax Day!
The income tax was brought back (we had in during the Civil War as well) during the Great War, as wars are expensive, although in all fairness its hard to see how it could have been postponed indefinitely.
It's April 18 this year due a holiday that fell on Monday, April 17, in Washington D. C.
World War One may have brought the tax in, but frankly the modern state had clearly been coming in at the same time. There would have been no other easily discernible way to pay for that without an income tax.