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 Richest Man in Babylon In good times and bad, consistently saving a percentage of your income is a sound financial practice. Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process. Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit.