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 Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process. Put It in a Letter A letter of instruction provides additional and more personal information regarding your estate. Are Alternative Investments Right for You? With alternative investments, it’s critical to sort through the complexity.