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A Control Number (Box D) is used by many payroll departments to uniquely identify a W-2 in their system.

• If your W-2 doesn't have one, it's no big deal – you can simply leave it blank.

• If you get errors when attempting to e-file with an empty Box D, just enter any number in this format:
  
• 5 digits, space, 5 digits (for example, 12345 67890).
  

• If you're trying to import your W-2 and you're persistently being asked to enter something in Box D, click skip import to get past this screen and manually enter your W-2 (which should only take a few minutes anyway).