Schedules K-1 are typically one of the last things that TurboTax developers finalize because calendar-year entities (which are the majority of entities that issue Schedules K-1) generally do not send Schedules K-1 until at least March because those entities have to prepare their tax returns first. Other aspects of TurboTax receive higher priority for finalization because they affect more users. The TurboTax and IRS resources involved in finalizing TurboTax's forms is finite, so it takes several months into tax filing season to get everything finalized.
