A tax that takes a larger percentage from the income of high-income earners than it does from low-income individuals. The United States income tax is considered progressive: in 2010, individuals who earned up to $8,375 fell into the 10% tax bracket, while individuals earning $373,650 or more fell into the 35% tax bracket. Basically, taxpayers are broken down into categories based on taxable income; the more one earns, the more taxes they will have to pay once they cross the benchmark cut-off points between the different tax bracket levels.