I too filed for an extension and patiently waited for TurboTax to release a fix for the K-3 issue.
However, as time is rapidly approaching for the extension filing deadline, it has become clear to me that TurboTax has punted on this issue for the 2021 tax filing season. Perhaps I'm wrong and they'll still come through before the deadline, but they've had five additional months and still nothing.
So, yesterday I decided not to wait any longer. I printed my TurboTax return as is, attached the K-1 and associated K-3 from my REIT and mailed it all in to the IRS. In my case, the printed return did not include a TurboTax version of the K-1 (or bits of the K-3 I was able to enter), merely entries from it on the appropriate line items on the 1040 and associated forms. The details from the REIT K-3 also didn't appear to impact anything else in the return, merely adding details for the IRS to track. However, given the complexity of the forms, I can't be 100% certain of that. That was the whole point of waiting for the TurboTax fix, to have confidence all the numbers would be entered correctly and carry through appropriately.
Bottomline: This solution is hardly ideal and as I stated I'm not entirely satisfied with the result, but at the moment it's seems to be the only option available using TurboTax. Hopefully, the IRS will be satisfied and accept the result as a good faith effort to comply with the tax regulations.
Keep in mind that I'm not a tax professional, just another person trying to get their taxes done. Looking back, perhaps taking it all to a tax pro would have been a better option. I'll definitely consider that next year given how poorly TurboTax handled this issue. Maybe sooner if I get audited.
Good luck.
