Is there a worksheet or instructions for Social Security Recipients Who Contribute to a Traditional IRA?

TurboTax does do the calculations from Appendix B of Pub 590-A when required.  This is implemented in Worksheets 1, 2 and 3 of TurboTax's Social Security Recipients Who Contribute to a Traditional IRA Worksheet ("IRA SS Wks" in the forms list).

Thank you! This led me to the right solution, but with this difference:

Searching forms for "IRA SS Wks" doesn't yield a result, and this form didn't appear independently anywhere (at least so far) in Turbotax Home & Business 2020.

The button on IRA Contribution worksheet, Line 13 "Worksheet for social security recipients" opens the calculation, and then shows the form at the very bottom of the  "Forms in My Return" list. Until I clicked that button, I couldn't find this worksheet and it's calculation.

Thanks again.

If the result on this worksheet indicates that factoring in the Social Security income makes no difference in the amount of the IRA contribution that is deductible, it's possible that TurboTax simply omits the worksheet from the forms list.