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 Four Really Good Reasons to Invest There are four very good reasons to start investing. Do you know what they are? Data Thieves from Outer Space Learn about the dangers of internet fraud with this highly educational and fun “pulp” comic. Creative Ways to Motivate Your Employees Five creative (and inexpensive) ideas for motivating your employees.