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 Net Unrealized Appreciation (NUA) Explained Have you considered the special tax treatment on company stock held in a 401(k) plan? Potential Income from an IRA Estimate your monthly and annual income from various IRA types. Catch-Up Contributions Workers 50+ may make contributions to their qualified retirement plans above the limits imposed on younger workers.