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? Name Email Address Question Thank you! Oops! Related Content My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates. From Boats to Brokers From the Dutch East India Company to Wall Street, the stock market has a long and storied history. Retirement Planning With Your Special Needs Child in Mind Having a special needs child adds another layer of complexity to retirement planning. A special needs trust may help.