I can't find box 'd' in my W2. can you assist me for find this number?

Box D of your W-2 is used as a control number.

https://ttlc.intuit.com/replies/4417180

Sorry that wasn't helpful. Is there something specific I can help you with?

Box D is on the left side of your W-2:

Box A:  Employee's SSN

Box B:  Employer Identification Number

Box C: Employer's Name and Address

Box D: Control Number