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 Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit. Roth IRA for Kids Learn about the benefits and requirements of opening a Roth IRA for kids. Diversification, Patience, and Consistency Three important factors when it comes to your financial life.