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 When Life Insurance Becomes Taxable Life insurance proceeds are generally tax-free. But not in all cases. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government. Social Security: Maximizing Benefits There are other ways to maximize Social Security benefits, in addition to waiting to claim them.