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 The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you. What the New Tax Bill Means for You What does the Tax Reform and Jobs Act mean for you? Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax.