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 The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you. Diversification, Patience, and Consistency Three important factors when it comes to your financial life. Leaving Your Lasting Legacy Want to do more with your wealth? You might want to consider creating a charitable foundation.