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 | Have A Question About This Topic? Name Email Address Message Thank you! Oops! 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. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable.