31 C.F.R. § 363.54 What is the minimum amount of a book-entry savings bond that I must hold in my account?
Title 31 - Money and Finance: Treasury
Each bond held in your account must have a redemption value of at least $25. If you request a transaction that would reduce the remaining redemption value of the bond to an amount less than $25, we will not permit the transaction to occur.
Title 31: Money and Finance: Treasury
PART 363—REGULATIONS GOVERNING SECURITIES HELD IN TREASURYDIRECT
Subpart C—Book-Entry Savings Bonds Purchased Through TreasuryDirect
General
§ 363.54 What is the minimum amount of a book-entry savings bond that I must hold in my account?

