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 Insurance Needs Assessment: When You're Young and Single Even if you’re young and single, you should still consider protecting yourself. How Financial Professionals Are Compensated Read this overview to learn how financial advisors are compensated. Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit.