While I recommend filing an amended return, if you don't, then the IRS will recalculate your tax return based upon the information on the additional W-2 and either issue you a refund, or bill you for additional tax due (plus penalty and interest). This could happen right way, or it could take them a while to get around to it.
To amend your Online return, click on: How do I amend my 2019 TurboTAx Online Return
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