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 Medicare Advantage 101 Overview of Medicare Advantage, what’s in them, special rules, and more. Catch-Up Contributions Workers 50+ may make contributions to their qualified retirement plans above the limits imposed on younger workers. Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process.