Tax Freedom Day Assess how many days you'll work to pay your federal tax liability. 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 Question Thank you! Oops! Related Content Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. Saving for Retirement This calculator can help you estimate how much you may need to save for retirement. What is the Value of Your Business? Ascertaining the value of your business is important for a variety of reasons.