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 What Do Your Taxes Pay For? Here's a breakdown of how the federal government spends your tax money. Life and Death of a Twenty Dollar Bill How long does a $20 bill last? The Financial Literacy Crisis Many Americans are operating their personal finances with only the barest minimum of knowledge.