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 Should I Pay Off Debt or Invest? This calculator will help determine whether you should invest funds or pay down debt. Succeeding at Business Succession There are a number of reasons for business owners to consider a business succession plan sooner rather than later. When Life Insurance Becomes Taxable Life insurance proceeds are generally tax-free. But not in all cases.