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. Share | Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content Defining Your Priorities Achieving a long-term goal, like retirement, starts by taking small actions today. Tax Efficiency in Retirement What role would taxes play in your investment decisions? Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit.