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 Choosing a Retirement Plan that Fits Your Business To choose a plan, it’s important to ask yourself four key questions. Acres of Diamonds In life it often happens that the answers to our most pressing questions are right in our own backyards. Filing Final Tax Returns for the Deceased The federal government requires deceased individuals to file a final income tax return.