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 Should You Borrow from Your 401(k)? Does it make sense to borrow from my 401(k) to pay off debt or to make a major purchase? Insurance Needs Assessment: For Empty Nesters and Retirees Do your insurance needs stay the same when the nest empties? The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you.