Well, back when dinosaurs roamed the US and I prepared a return on paper I filed before a received one of my W-2s. I was told by the IRS that if you can file another return before the due date. They will accept the most recent one filed. I added a note with the return that I'd received the W-2 after I'd filed which was the reason for the change. No 1040X was needed. How that works in the electronic filing age I don't know. I would contact the IRS or Tubrotax.
