- The first income taxes in the United States were passed during the Civil War but were repealed soon after. The 16th Amendment made it constitutional to pass a federal income tax and the first permanent income tax was passed in 1913.
- The federal income tax system taxes both earned income, such as wages and salaries, and unearned income, such as interest and dividends.
- The federal income tax system is a progressive tax, meaning that the more taxable income you have the greater percentage of your earnings you pay in income taxes.
- The 1913 income tax had a maximum tax bracket of 7 percent. As of 2009 the largest tax bracket is 35 percent. During World War II, the largest tax bracket was 94 percent.
- In 1913, only 1 percent of Americans paid federal income taxes. According to CNN, 53 percent of households in the United States will have to pay income taxes in 2009.














