If you have not received or lost your W-2,
then see the TurboTax FAQ below for information on what you can do to either
get your W-2, or file using a substitute W-2.
However, if you file using Form 4852 for a substitute W-2, you can't e-file your return.
https://ttlc.intuit.com/replies/3301808
https://ttlc.intuit.com/replies/5451995
