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 Managing an Inheritance A windfall from a loved one can be both rewarding and complicated. How Will Working Affect Social Security Benefits? Knowing the rules may help you decide when to start benefits. When Do You Need a Will? When do you need a will? The answer is easy: Right Now.