If you have already filed your returns and they have been accepted, you will need to wait for them to complete processing (refund deposited or letter from the IRS notifying you of inconsistent W2 information). The IRS will normally catch W2 errors and notify you with instructions on how to correct.
Should you need to amend. The amendment forms are projected to be available in TurboTax around 25 March. You will need to sign in to your account and select the "Amend" option. Follow the prompts to make the corrections and then print, sign and mail in the amended returns.
If you have not filed yet then revisit the "Job (W2)" topic in the "Wages & Income" tab and make the corrections.
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