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 Anatomy of an Index The S&P 500 represents a large portion of the value of the U.S. equity market, it may be worth understanding. How Big is Money? Learn a little about worldwide currency in this fun infographic A Primer on Dividends A company's profits can be reinvested or paid out to the company’s shareholders as “dividends."