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 Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Tax Freedom Day Assess how many days you'll work to pay your federal tax liability. Acres of Diamonds In life it often happens that the answers to our most pressing questions are right in our own backyards.