I think I may have discovered my problem with the IRA Contribution interview not asking for IRA Year-End values. I failed to answer one of the Interview questions correctly when adding the 1099-R for an IRA Distribution that was actually a conversion to a Roth IRA. When it asked what I did with money, I answered something like I kept it (cash out) instead of moving the money to another retirement account. When I corrected that, it then asked about moving the money to a Roth vs another account or returning it to the same account, and then asked about 2019 basis and 2020 Year-End value. The Form 8606 and IRA Tax Worksheet then seemed to fill out and calculated correctly. I see now that while my income is above the limit for contribution deductibility, TurboTax seems to be accounting for how much of a distribution is taxable when making a non-deductible contribution with after-tax money. This also points out that you have to be extremely careful during the Interview. If you answer incorrectly, the program won't know, thus error check won't find it, and you can file an incorrect return. Thanks to everyone who contributed to this discussion, as I was eventually able to find my mistake. I really couldn't believe TurboTax was wrong after all these years. But, I sure got fooled by my mistake for a while.
