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 Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work. Silver Sneakers 101 Medicare’s popular program, offering free gym membership and health education. How to Retire Early Retiring early sounds like a dream come true, but it’s important to take a look at the cold, hard facts.