Related Clues:

• ID with dashes
• Form W-9 datum: Abbr.
• Common form datum: Abbr.
• Tax ID
• Govt.-issued ID
• ID for the I.R.S.
• Lifelong assignment, briefly?
• One form of ID
• Paycheck ID, perhaps
• ID theft target
• Box "d" on the IRS W-2
• IRS W-4 info
• Hirer's request: Abbr.
• Identity thief's target: Abbr.
• Fig. issued at birth