{"data":{"id":"us/31-cfr-359.19","jurisdiction":"us","citation":"31 CFR 359.19","heading":"How is interest calculated?","body":"We base all calculations of interest on a $25 unit. We use the value of this unit to determine the value of bonds in higher denominations. The effect of rounding off the value of the $25 unit increases at higher denominations. This can work to your slight advantage or disadvantage, depending on whether we round the value up or down. 3","path":["Title 31—Money and Finance: Treasury","Subtitle B—Regulations Relating to Money and Finance","CHAPTER II—FISCAL SERVICE, DEPARTMENT OF THE TREASURY","SUBCHAPTER A—BUREAU OF THE FISCAL SERVICE","PART 359—OFFERING OF UNITED STATES SAVINGS BONDS, SERIES I","Subpart A—General Information"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-31.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:25Z","sha256":"999b13fab029f2f4fe1798c48e10f2c0f43e15eb344949af71843605768ec6ad","source_id":"us-cfr","stale":true,"prev":"us/31-cfr-359.18","next":"us/31-cfr-359.20-359.24"},"notice":"GroundRules: Original legal text. Not legal advice."}