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June 1, 2019

For the Control Number, 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.

Control Number is used by companies internally.  You really don't need it

On the other hand, if you're trying to import your W-2 and you are asked for a Control Box D, and you don’t have one, click skip import and then manually enter your W-2. You won't be able to import using the 5 digit + space + 5 digit solution for e-filing.