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 When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Filing Final Tax Returns for the Deceased The federal government requires deceased individuals to file a final income tax return. How Women Can Prepare For Retirement Are women prepared for a 20-year retirement?