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 The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you. Six Most Overlooked Tax Deductions Six overlooked tax deductions to help manage your tax bill. Tax Management Strategies Learn more about taxes, tax-favored investing, and tax strategies.