31 CFR §359.39

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We determine the redemption value of a definitive savings bonds for the accrual date (the first day of each month) by first determining the composite rate as defined in § 359.13. If the result of the composite rate calculation is a negative value, zero will be the assumed composite rate in the redemption value calculation. Redemption values are calculated using the following formula (For examples of the calculation, see appendix A to part 359):