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 8 Financial Milestone Birthdays Get ready to celebrate your financial birthdays in this informative infographic. Trends in Charitable Giving Some people may want a more advanced gifting strategy that can maximize their gift and generate potential tax benefits. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government.