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 The Pre-Retirement Checklist This checklist can give you a quick snapshot of how prepared you are. Gap Insurance for Leased Cars If you’re thinking of leasing a new car, then you shouldn’t forget about gap insurance. 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."