Your best bet is to ask your employer or payroll department for another copy of your W-2.

Here are some more options:

• Order a copy from the Social Security Administration. It's free if you need it for Social Security-related reasons; otherwise, it's $86 per request.
• Order a full copy of your return from the IRS for $50, which will also include your W-2.
• Wage and income transcripts are available from the IRS free of charge. 
• They're not exact copies, but they contain everything on your W-2 except the state and local information.

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What if I still don't have my W-2?

https://ttlc.intuit.com/community/income/help/what-if-it-s-february-but-i-still-don-t-have-my-w-2/00...