The control number on a W2 is not used for your tax return in any way, so you can leave this input blank. However, if you get an error message requiring the control number, you must enter it as 5 numbers followed by a space and then 5 more numbers. Since this information is not used on your tax return, you can use any combination of numbers you choose. If you are getting this error message while importing your W2, you will need to manually enter it.
Please see this TurboTax Help Article for more information: I have no Box D or Control Number on my W2
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