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 Lowdown on Those Free Credit Scores What’s the deal with your yearly free credit report? Retirement Questions That Have Nothing to Do With Money Things to consider before retirement. Global and International Funds Investors seeking world investments can choose between global and international funds. What's the difference?