[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: 31CFR359.5] [Page 451] 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 A_General Information Sec. 359.5 What is the maturity period of a Series I savings bonds? Series I savings bonds have a total maturity period of 30 years from the issue date, consisting of an original maturity period of 20 years and an extension period of 10 years.