This Day in History – August 5, 1861 Tags: 19th century American history, 3 percent tax, Abraham Lincoln, Abraham Lincoln portrait, American Civil War, August 5 1861, August 5 1861 history, Civil War era, Civil War finance, economic history, federal taxation, First Federal Income Tax, first income tax law, historical legislation, historical presidential acts, internal revenue, Revenue Act history, Revenue Act of 1861, this day in history, this day in history 1861, This Day in History August 5, US Department of the Treasury, US government history, US history 1861, wartime emergency measures, Share on: Share: This is where the text will go.View our photo collection! View Collection