View all text of Subpart A [§ 359.0 - § 359.24]
§ 359.16 - When does interest accrue on Series I savings bonds?
(a) Interest, if any, accrues on the first day of each month; that is, we add the interest earned on a bond during any given month to its value at the beginning of the following month.
(b) The accrued interest compounds semiannually.