@fanfare, thanks again for the quick response. I remember thinking it was odd that there wasn't a Schedule D -- seems like an error in Turbo Tax. I didn't import the info from my broker because they aren't one Turbo tax is set up to automatically import. I typed in the data, just not certain whether I did aggregates or individual transactions (based on IRS data, I suspect I entered individual data).
The IRS isn't complaining about the lack of Schedule D, but rather that the cost basis was entered as both the cost basis and the proceeds for every single transaction (although how I have any capital gains at all in that instance is curious). I just started a dummy return and entered the details from a few transactions from my brokerage statement. I do not see how I could have made that mistake on all lines -- would be hard enough on a single line. Such a mistake would certainly be possible a time or two, but not on the ~36 lines of transactions (assuming I entered them individually, not in aggregate).
Based on your comments I am really starting to think this was a Turbo Tax mistake, but I agree with your assessment of the challenge in pursuing that path. But if, as it appears, that the information was calculated based off the incorrect data (however that came to be), I do owe the IRS a fairly significant sum. And I probably need to recalculate for 2022 as well.
Thanks for your help.
