The format of the ID number you are looking for is XX-XXXXXXX. If there is not a number with this format on your W-2 contact your employer and notify them that you do not have their tax ID number on your W-2. Not having taxes withheld will not be a problem with the IRS when you file your return. By not having taxes withheld you may incur an underpayment penalty depending on your tax liability.
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