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 Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable. Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates.