U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
(a) The regulations in 31 CFR part 360 apply to definitive (paper) Series I savings bonds that have not been converted to book-entry bonds through New Treasury Direct.
(b) The regulations in 31 CFR part 363 apply to:
(1) book-entry Series I savings bonds that were originally issued as book-entry bonds in New Treasury Direct; and
(2) definitive Series I savings bonds that have been converted to book-entry bonds through New Treasury Direct.
(c) We expressly disclaim any representations or warranties regarding Series I savings bonds that in any way conflict with these regulations and other applicable law.