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 Question Thank you! Oops! Related Content IRA Withdrawals that Escape the 10% Tax Penalty The list of IRA withdrawals that may be taken without incurring a 10% early penalty has grown. Put It in a Letter A letter of instruction provides additional and more personal information regarding your estate. Eight Mistakes That Can Upend Your Retirement There are common mistakes you can avoid when saving for retirement.