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 A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government. When Life Insurance Becomes Taxable Life insurance proceeds are generally tax-free. But not in all cases. Tuning Your Social Security Benefit When should you take your Social Security benefit?