Per IRS, employers will meet the furnish requirement if the form is properly addressed and mailed on or before the due date of January 31.
You generally need to amend your income tax return if the W-2 affects your refund or amount due. Please see Do I need to Amend? for additional information.
Note: the 2021 amendment form 1040-X hasn't been released by the IRS so you won't be able to amend your tax return until then. See When will my forms be ready?
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