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 Where Will Your Retirement Money Come From? Retirement income may come from a variety of sources. Here's an overview of the six main sources. What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement. Leaving Your Lasting Legacy Want to do more with your wealth? You might want to consider creating a charitable foundation.