31 C.F.R. § 359.56

How can I find out what my book-entry Series I savings bonds are worth?

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(a) Redemption values. You may access redemption values for your book-entry bonds through your New Treasury Direct account.

(b) Redemption penalty. Redemption values shown in your New Treasury Direct account reflect the three-month interest penalty applied to bonds redeemed prior to five years from the date of issue.