You can’t add another W-2 (nor another type of tax document: 1099, 1098, etc.) if you have already filed your tax return. You must wait for the IRS to process your initial return
The IRS may either Accept or Reject your filed federal tax return.
If the return is rejected you can open your return again, make the necessary changes and e-file again.
If the return is accepted you will have to amend your original tax return using Form 1040-X. If you e-filed your original return, then you can go back online to make the necessary changes and then e-file the amended return.
Also, before you start to amend the tax return, you should wait for the original tax refund to be received (or the taxes due to be paid).
However, if you paper-filed (mailed) your original return, you will need to paper-file (mail) your amended return.
The IRS may take up to 20 weeks or longer to process an amended tax return.
For more information, please see TurboTax FAQ: How do I amend my federal tax return for this year?
The tentative date that the 1040-X form to amend your original tax return may be 2/25/26.
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