I don't understand why TurboTax doesn't support Form 8990 for individual filers. It does seem necessary to file it when a K-1 includes amounts on line 13K.
Note that TaxAct does provide the ability to attach a PDF of Form 8990 to an E-filed return:
https://www.taxact.com/support/[removed]/form-8990-not-supported
For some reason, TurboTax can't even do that. Very disappointing!
