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 Question Thank you! Oops! Related Content What is Guaranteed Retirement Income? Get the facts about guaranteed retirement income. A Decision Not Made Is Still a Decision Investors who put off important investment decisions may face potential consequence to their future financial security. Self-Employed Retirement Plans Estimate the maximum contribution amount for a Self-Employed 401(k), SIMPLE IRA, or SEP.