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. Understanding the net investment income tax Did you earn income from your investments this year? If so, you may have to pay the net investment income tax. Tax Management Strategies Learn more about taxes, tax-favored investing, and tax strategies.