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. Related Content Dreaming Up an Active Retirement When you retire, how will you treat your next chapter? The Great Debate Continues: Active vs. Passive In investments, one great debate asks the question, “Active or Passive Investing: Which Is Better?” Contributing to an IRA? Determine if you are eligible to contribute to a traditional or Roth IRA.