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 Assess Life Insurance Needs How to help determine life insurance needs to provide for your family after you pass away. Filing Final Tax Returns for the Deceased The federal government requires deceased individuals to file a final income tax return. Good Health is Good Business Good employee health can be great for the company’s bottom line.