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 Dreaming Up an Active Retirement When you retire, how will you treat your next chapter? Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government.