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 Coaches Coaches have helped you your whole life, in ways big and small. We'd like to be one of them. Deciding When to Take Social Security One of the most common questions people ask about Social Security is when they should start taking benefits. Separating the Signal From the Noise A good professional provides important guidance and insight through the years.