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Glad to see you again, @laura-shelly.
When there's a mistake on an already-filed W-2 form, you can still amend it by filing a Form W-2 c. However, since you'll only change the DOB, it'd be best to consult the IRS first to check if they can correct this information.
If the IRS confirmed that you'll need to file an amendment form, you can refer to this article for the outlined steps: Correct or amend W-2 forms.
Leave a comment if you have further clarifications. I'm here to help. Take care.
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