Form SS-4 pev. 1.2010 EFTA00549995 rum ss•4 (net 1.2010) arca 2 Do I Need an EIN? File Form SS-4 if the applicant entity does not already have en EIN but is required to show an FIN on any return. statement, a Other document.' See also the separate instrue0One for each line on Form S.S.4. F the ap