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 Saving for College 101 Here’s a crash course on saving for college. Retiring the 4% Rule A portfolio created with your long-term objectives in mind is crucial as you pursue your dream retirement. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government.