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 Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax. What to Look for in Personal Finance Apps An increasing number have been developed to help individuals with their personal finances. Required Reading: The Economic Report of the President The Economic Report of the President can help identify the forces driving — or dragging — the economy.