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 When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Why Everyone Needs an Estate Strategy Do you have an estate strategy? You should. What Do Your Taxes Pay For? Here's a breakdown of how the federal government spends your tax money.