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 Four Really Good Reasons to Invest There are four very good reasons to start investing. Do you know what they are? Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement.