Related Clues:

• Certain ID info
• Important ID
• W-4 datum: Abbr.
• ID to guard from identity theft
• W-4 fig.
• IRS requirement
• 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