Form W-2 Box d is a Control Number. It is usually located below the
Employer's Name and Address.
Box D: Is a Control Number. This is a code that identifies
this unique Form W-2 document in your employer's records. This number is
assigned by the company's payroll processing software.
NOTE: Not all W-2's (or employer) will include a Box-D.
If you choose, you do not have to enter anything from Box
D.
