31 C.F.R. § 363.56

What is the minimum amount of book-entry savings bonds that I may transfer in any one transaction?

Read at: eCFRecfr.gov CornellLII GovInfogovinfo.gov CasesGoogle Scholar

Each transfer must be in a minimum amount of $25 redemption value, with additional one-cent increments above that amount, in any one transaction. For example, you may transfer $25.00, $25.01, $25.02, or $25.03, and so forth. Transfers will be comprised of principal and proportionate interest.