Section 479.35 - Employer identification number(a)Requirement. The employer identification number (defined in 26 CFR 301.7701-12 ) of the taxpayer who has been assigned such a number shall be shown on each special tax return, including amended returns, filed under this subpart. Failure of the taxpayer to include the employer identification number may result in the imposition of the penalty specified in §70.113 of this chapter.(b)Application for employer identification number. Each taxpayer who files a special tax return, who has not already been assigned an employer identification number, shall file IRS Form SS-4 to apply for one. The taxpayer shall apply for and be assigned only one employer identification number, regardless of the number of places of business for which the taxpayer is required to file a special tax return. The employer identification number shall be applied for no later than 7 days after the filing of the taxpayer's first special tax return. IRS Form SS-4 may be obtained from the director of an IRS service center or from any IRS district director.(c)Preparation and filing of IRS Form SS-4. The taxpayer shall prepare and file IRS Form SS-4, together with any supplementary statement, in accordance with the instructions on the form or issued in respect to it.T.D. ATF-271, 53 FR 17551, 5/17/1988; as amended by T.D. ATF-301, 55 FR 47657, 11/14/1990