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 Choose Your Own Retirement Adventure Retirement is one of the greatest adventures you’ll have. Which retirement adventure will you choose? Deciding When to Take Social Security One of the most common questions people ask about Social Security is when they should start taking benefits. Choices for Your 401(k) at a Former Employer Individuals have three basic choices with the 401(k) account they accrued at a previous employer.