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 My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates. Safeguard Your Digital Estate If you died, what would happen to your email archives, social profiles and online accounts? Volunteering in Retirement For many, retirement includes contributing their time and talents to an organization in need.