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 Living Trust Primer Living trusts are popular, but their appropriateness will depend upon your individual needs and objectives. Bull and Bear Go To Market Learn about the difference between bulls and bears—markets, that is! The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you.