If you have not received a W-2 form by now, it is time to get the IRS involved. The instructions below will give directions on how to contact the IRS and how to complete a substitute W-2 form.
Do you know for certain that the IRS has not received the W-2 form?
IRS takes until Sept-Oct to process all the information documents. So they could have it, just their system in not ready yet, so they have some folks to call employers on certain returns. Did you receive an IRS letter?
If so, use the contact information on the letter to inquire if you can send in paystubs to verify.