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 How Will Working Affect Social Security Benefits? Knowing the rules may help you decide when to start benefits. What Do Your Taxes Pay For? Here's a breakdown of how the federal government spends your tax money. Retirement Traps to Avoid Beware of these traps that could upend your retirement.