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. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content Retirement Redefined Around the country, attitudes about retirement are shifting. Understanding the Alternate Valuation Date Executors can value the estate on the date of death, or on its six-month anniversary —the “Alternate Valuation Date." How to Make the Tax Code Work for You When you take the time to learn more about how it works, you may be able to put the tax code to work for you.