Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable. 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? Address Thank you! Oops! Related Contents Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax. Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit. Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one.