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@Jen5 wrote:

The other kink is the check to reimburse the third party disability payer was dated 1/29/21

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The W-2 is correct.  That is what was paid in 2020.

You may be able to get some benefit on the 2021 tax return due to the repayment in 2021.  You should look up and research "claim of right" for repayments.