You have to wait. The IRS will start processing returns on Jan. 28. Your return will be accepted or rejected soon after that. If it is rejected, you can add the W-2, fix the reason for rejection and resubmit your efile.
If it is accepted, you must wait until your return is processed by the IRS and you receive the refund. You can then begin the amending process to prepare, print, sign and mail an amended return form 1040X. Do not add you W-2 or make any changes to your original tax return until you start the amended return with the 1040X. The 1040X is estimated to be available in TurboTax on 1/25/19. The amended return must be mailed. It can't be efiled. It takes the IRS about 16 weeks to process and amended return.
