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 Saving for Retirement This calculator can help you estimate how much you may need to save for retirement. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government. Diversification, Patience, and Consistency Three important factors when it comes to your financial life.