Form 4852 serves as a substitute for Forms W-2, W-2c, and 1099-R (original or corrected).
You complete it when your employer or payer hasn't issued you a Form W-2 or Form 1099-R, or the employer or payer has issued you an incorrect Form W-2 or Form 1099-R.
If you need to file a Form 4852, please see the TurboTax Help article How do I file a substitute W-2 using Form 4852? for guidance.
Since employers have only until January 31st to mail out W-2s, also see the Help article What if it's February but I still don't have my W-2? for guidance.
Returns that include Form 4852 can't be e-filed, but must be printed and mailed instead.
