Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Content Historical Inflation This calculator shows how inflation over the years has impacted purchasing power. Bull & Bear Markets: A Timeline This helpful infographic will define bull and bear markets, as well as give a historical overview. Tax Freedom Day Assess how many days you'll work to pay your federal tax liability.