The United States federal government and most state governments impose an income tax. They are determined by applying a tax rate, which may increase as income increases, to taxable income, which is th
Total U.S. tax revenue as a % of GDP and income tax revenue as a % of GDP, 1945–2011, from Office of Management and Budget historicals
The U.S. federal effective corporate tax rate has become much lower than the nominal rate because of various special tax provisions.
People filing tax forms in 1920.
President Abraham Lincoln and the United States Congress introduced in 1861 the first personal income tax in the United States.
The Sixteenth Amendment to the United States Constitution allows Congress to levy an income tax without apportioning it among the states on the basis of population. It was passed by Congress in 1909 i
Income tax in the United States
…limits, and an Alternative Minimum Tax (AMT) applies at the federal and some state levels. The federal government has imposed an income tax since the Sixteenth Amendment to the U.S. Constitution was ratified in 1913, and 42 U.S. states impose state income taxes. Income taxes are levied on wages as well as on capital gains, and fund federal and…
The Sixteenth Amendment in the National Archives
Comic depicting the ratification of the Sixteenth Amendment