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 Message Thank you! Oops! Related Content A Penny Saved is Two Pennies Earned Here are some simple and inexpensive energy-saving tips that may help you save money. Choosing a Business Structure Entrepreneurs all face the same question, “Which business structure should I adopt?” Debt Stress There’s a link between debt and stress.