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. The Wild West of Data Theft Learn about cyber liability insurance in this entertaining video. Tax Rules When Selling Your Home The tax rules governing profits you realize from the sale of your home have changed in recent years.