590 Appendix B is the life expectancy table used to calculate RMD's.
The calculation of your taxable Social Security can be found in the Online version after you've paid or in the Forms mode in the Desktop version. It is listed as the Social Security Benefit Worksheet (It may be abbreviated in TurboTax).
This link gives the instructions and examples of the calculation worksheet.
IRS Social Security Worksheet
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
