Thanks for your reply. That is actually the problem -- line 11 from form 1040 does not agree with line 1 in Worksheet 1 of the "IRA SS Wks" in TurboTax, which is adapted from Appendix B of 590-A. The data source is supposed to be the worksheet from Appendix C, but this is not shown in TurboTax so I can't see how that calculation is done. It is supposed to take line 11 and subtract a few simple things -- in my case, Social Security and the IRA deduction itself. But when I do this computation manually by filling out the worksheet in Appendix C, I get a much different number. In my case I have also taken an IRA distribution so I apparently fall into the "special calculation" handling mentioned in the data source pop-up, but I can't figure out what that calculation might be and I can't seem to find it anywhere in TT.
(I've also tried printing out the pdf with all supporting records and searching for that number, but it doesn't show up anywhere except this one line item in the IRA SS Worksheet.)
