Form 4852 Instructions state: "You should always attempt to get Form W-2 or Form 1099-R from your employer or payer before contacting the IRS or filing Form 4852.

I've had 4 jobs recently and none of them will give me my W-2’s to file my taxes. That's a sticky place to be, but there are ways to get around it. The IRS has Form 4852 for you to fill out. It ...

The IRS can send you a “Substitute for Form W-2 or Form 1099-R,” which is a Form 4852, so that you can file your taxes. You’ll need to estimate your income or wages on Form 4852.

Form 4852 requires you to estimate the items that would be in your W-2 form. Again, if you have your last pay stub, this should be relatively easy.To use Form 4852, you must have notified the IRS ...

If you file your return and attach Form 4852 to support the withholding amount claimed instead of a Form W-2, your refund can be delayed while the information you gave us is verified.

The IRS will contact the employer/payer for you and request the missing form. IRS will also send you a Form 4852, Substitute for Form W-2 or Form 1099-R. Hope that helps.