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 How Income Taxes Work A quick look at how federal income taxes work. A Meal for All Generations When it comes to generational differences, knowing the facts can be difficult. The Fed and How It Got That Way Here is a quick history of the Federal Reserve and an overview of what it does.