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 Important Birthdays Over 50 Here's a look at several birthdays and “half-birthdays” that have implications regarding your retirement income. How Financial Professionals Are Compensated Read this overview to learn how financial advisors are compensated. Choosing a Retirement Plan that Fits Your Business To choose a plan, it’s important to ask yourself four key questions.