@tobias_funke
As to where the problem lies, I can't be 100% certain (who can?) but there's obviously been exhaustive discussion here and it appears TurboTax is correctly including in returns - and correctly filling in - Form 8960 for anyone "Who Must File" according to the 2022 Form 8960 instructions.
Add to that, the IRS's website page for "Known Issues" sure seems to describe this issue exactly, saying that the error in their systems causes e-filings to be "erroneously rejected." In short, they updated the instructions for the form but neglected to update the "business rules" in their systems which screen incoming e-filings. So when you do what the IRS tells you to do, the IRS systems reject the e-filing as incorrect. SNAFU.
As I'm sure you're already aware, the IRS says late-February to mid-March for a fix. I've already contacted the offices of my Congressperson and both Senators to see if they can get this issue prioritized. Not much else to do but wait? Seems to me that Occam's Razor is useful here: if the IRS says their systems are the problem with this error, then their systems are the problem.
As I summarized in a reply somewhere above regarding other tax prep options, at first a bunch of people filed via HRB but it sounded like HRB was not actually following the 2022 instructions (i.e., not attaching an 8960 with Sc. C on Lines 4a/4b). Then, after a few days, people started reporting that HRB *was* attaching an 8960. And users of some of the other tax prep sites are getting the same error we are (with 8960's filled in the same way).
There are also posts from folks here who say they "solved" the problem by not reporting income that should be on Form 8960, with the intention of first receiving an incorrect refund (or making an underpayment) and then amending later. Doesn't seem like a good idea, but that's not my business...
