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 The Cycle of Investing Understanding the cycle of investing may help you avoid easy pitfalls. Making Sense Of A Home Warranty Understanding the value of a home warranty. Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit.