Section 359.9 - When are interest rates for Series I savings bonds announced?(a) The Secretary will furnish fixed rates, semiannual inflation rates, and composite rates for Series I savings bonds in announcements published each May 1 and November 1.(b) If the regularly scheduled date for the announcement is a day when the Treasury is not open for business, then the Secretary will make the announcement on the next business day. However, the effective date of the rates remains the first day of the month of the announcement.(c) The Secretary may announce rates at any other time.