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 | Related Content Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax. Do You Owe The AMT? If you want to avoid potential surprises at tax time, it may make sense to know where you stand when it comes to the AMT. Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one.