It depends.
Did you already file your original tax return and then had a corrected Form W-2 issued?
If so, you will need to amend your tax return using a Form 1040X to reflect the most recent W-2 Form. Please see the links below to determine if this applies to you as well as for steps on how to prepare the amended return.
Do I need to amend?
How to amend my return?
If however, you were issued a substitute W-2 Form, you can use the Form 4852 and mail your tax return in.
Substitute W-2 with Form 4852
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