You can't correct your W-2 on your own. It won't match what your Employer reported to the IRS
Per IRS:
If your W-2 is incorrect
Ask your employer to correct the error. If your employer doesn't correct it by the end of February, you should either:
We'll send your employer a letter asking them to give you a corrected W-2 within 10 days.
We'll also send you instructions for Form 4852, Substitute for Form W-2. You can use it to estimate your earnings.
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