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 Question Thank you! Oops! Related Contents Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one. Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit. Tax Management Strategies Learn more about taxes, tax-favored investing, and tax strategies.