[Code of Federal Regulations] [Title 31, Volume 2] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 31CFR363.131] [Page 495] TITLE 31--MONEY AND FINANCE: TREASURY CHAPTER II--FISCAL SERVICE, DEPARTMENT OF THE TREASURY PART 363_REGULATIONS GOVERNING SECURITIES HELD IN TREASURYDIRECT--Table of Contents Subpart D_Certificate of Indebtedness Sec. 363.131 What is a TreasuryDirect[supreg] certificate of indebtedness? A TreasuryDirect certificate of indebtedness (certificate of indebtedness) is a security held within your primary or linked account, including a minor account for which you are the custodian, that is issued daily, with a one-day maturity, that automatically rolls over at maturity until you request redemption. A certificate of indebtedness has a minimum purchase amount of one cent. The only purpose of a certificate of indebtedness is to accumulate funds for the purchase of another eligible security in the TreasuryDirect system. A certificate of indebtedness within a minor's account is the property of the minor alone.