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 The Average American Budget Learn about the average American budget in this fun and interactive piece. Estimating the Cost of College This worksheet can help you estimate the costs of a four-year college program. Consider Keeping Your Life Insurance When You Retire Reasons to retain your coverage into your retirement years.