27 CFR § 40.170 - Application for employer identification number.
Every manufacturer of tobacco products who has neither secured an employer identification number nor made application therefor shall file an application on Form SS-4. Form SS-4 may be obtained from any service center director or from any district director. Such application shall be filed on or before the seventh day after the date on which any tax return under this part is filed. Each manufacturer shall make application for and shall be assigned only one employer identification number for all internal revenue tax purposes.
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