The testing that I've done with the latest release (R14, 1/24/2019) seems to show that the functionality is there and that TurboTax is calculating QBI for all three types of pass-through entities. However, TurboTax is still treating any tax return with a Schedule K-1 entry as not yet ready for filing.
Previous releases of 2018 TurboTax did not create all of the linkages necessary to calculate QBI, so if you entered self-employment income or a Schedule K-1 using an earlier version of 2018 TurboTax, you likely need to go back through all sections related to the entry of the information regarding the pass-through entity so that the proper linkages will be established.
