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 How to Retire Early Retiring early sounds like a dream come true, but it’s important to take a look at the cold, hard facts. How Income Taxes Work A quick look at how federal income taxes work. Retirement and Quality of Life Asking the right questions about how you can save money for retirement without sacrificing your quality of life.