CFR›Title 27›Chapter I›Part 17›Subpart C ContainsSections 17.21–17.23CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart C—Registration Sections 17.21 § 17.21 Registration. 17.22 § 17.22 Employer identification number. 17.23 § 17.23 Application for employer identification number. SourceT.D. TTB-79, 74 FR 37402, July 28, 2009, unless otherwise noted. Previous B Subpart B—Definitions Next E Subpart E—Bonds and Consents of Sureties