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 Question Thank you! Oops! Related Content Inflation & Retirement Estimate how much income may be needed at retirement to maintain your standard of living. Deciding When to Take Social Security One of the most common questions people ask about Social Security is when they should start taking benefits. Estate Management 101 A will may be only one of the documents you need—and one factor to consider—when it comes to managing your estate.