27 CFR § 40.360 - Application for employer identification number.
Each manufacturer of cigarette papers and tubes who has neither secured an EIN nor made application therefor shall file an application on IRS Form SS-4. IRS 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 subpart is filed. Each manufacturer shall make application for and shall be assigned only one EIN for all internal revenue purposes.