How can I add a W2 after I’ve already filed

The IRS will start processing returns on Feb 12. Until then TurboTax will hold your pending e-filed return. Pending returns can not be changed. If the return is accepted you will get an email. If the return is rejected the e-mail will tell you what to correct and you can make changes before

e-filing again

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Amend to change an accepted return

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Unfortunately, if you have already e-filed your return, you would not be able to add another W-2. You would need to wait until your return is either accepted or rejected. If it's rejected, you can simply go in and fix the error, add the W-2 and re-submit your return. If it's accepted, you would want to wait until you receive your refund and then use the link provided below to amend your return:

How do I amend my 2020 TurboTax Online return?