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 When Should You Take Social Security Monthly Social Security payments differ substantially depending on when you start receiving benefits. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government. Critical Estate Documents Sound estate management includes creating financial and healthcare documents. Here's an inside look.