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 9 Facts About Social Security There are things about Social Security that might surprise you. Tax Freedom Day Assess how many days you'll work to pay your federal tax liability. Investing with Your Heart For some, the social impact of investing is just as important as the return, perhaps more important.