What if my social security number is wrong on my w2 and I already filed my taxes?

If your  Form W-2 ...aren't available to you by January 31, 2017, or if your information is incorrect on these forms,  contact your employer/payer . If by the end of February you still haven't received the missing or corrected form, you may call the IRS at 800-829-1040 for assistance. When you call, please have the following information available:

• Your name, address (including ZIP code), phone number, and social security number,
• Your employer/payer's name, address (including ZIP code), and phone number,
• If known, your employer/payer's identification number (EIN)."

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