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 Will You Pay the AMT? Despite recent tax-law changes, many Americans are expected to pay the AMT this year. How Income Taxes Work A quick look at how federal income taxes work. Tax Management Strategies Learn more about taxes, tax-favored investing, and tax strategies.