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 The Average American Budget Learn about the average American budget in this fun and interactive piece. From Boats to Brokers From the Dutch East India Company to Wall Street, the stock market has a long and storied history. Exploring the Federal Student Grant Program In this article, explore the benefits of the Federal Student Grant Program.