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 Where Will Your Retirement Money Come From? Retirement income may come from a variety of sources. Here's an overview of the six main sources. Critical Estate Documents Sound estate management includes creating financial and healthcare documents. Here's an inside look. Financial Aid for Students 101 Help your college-bound child explore scholarships, grants, and more with this article on paying for higher education.