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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).
The IRS doesn't care what's in Box D because its use by payroll departments is optional.
Now, 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).
FAQ: https://ttlc.intuit.com/questions/2669624-i-have-no-box-d-or-control-number-on-my-w-2?jump_to=answer...
