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 Where Will Your Retirement Money Come From? Retirement income may come from a variety of sources. Here's an overview of the six main sources. Saving Early & Letting Time Work For You The earlier you start pursuing financial goals, the better your outcome may be. Social Security: By the Numbers Here are five facts about Social Security that might surprise you.