Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Share | Related Content Your Cash Flow Statement A presentation about managing money: using it, saving it, and even getting credit. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. What's New for Social Security? There have been a number of changes to Social Security that may affect you, especially if you are nearing retirement.