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 Helpful Retirement Strategies for Women Learn how to address the challenges that women face when planning for retirement. Password Protection Strategies Simple steps may help you foil hackers and protect your privacy. Choosing a Retirement Plan that Fits Your Business To choose a plan, it’s important to ask yourself four key questions.