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 When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Retiree Health Care Coverage Overseas Retirees traveling abroad need to know that their health insurance travels with them. Retirement Questions That Have Nothing to Do With Money Things to consider before retirement.