[Code of Federal Regulations] [Title 31, Volume 2] [Revised as of July 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 31CFR359.28] [Page 453] TITLE 31--MONEY AND FINANCE: TREASURY CHAPTER II--FISCAL SERVICE, DEPARTMENT OF THE TREASURY PART 359_OFFERING OF UNITED STATES SAVINGS BONDS, SERIES I--Table of Contents Subpart B_Definitive Series I Savings Bonds Sec. 359.28 Are taxpayer identification numbers (TINs) required for the registration of definitive Series I savings bonds? The inscription of a definitive bond must include the TIN of the owner or first-named co-owner. If the bond is being purchased as a gift or award and the owner's TIN is not known, the TIN of the purchaser must be included in the inscription on the bond.