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 Question Thank you! Oops! Related Content Self-Employed Retirement Plans Estimate the maximum contribution amount for a Self-Employed 401(k), SIMPLE IRA, or SEP. 5 Benefits of Working in Retirement Here are 5 reason why you may consider working through retirement. Investing with Your Heart For some, the social impact of investing is just as important as the return, perhaps more important.