Treasury Department announces new Series I bond rate of 5.51% for the next six months

The U.S. Department of the Treasury set the Series I bond composite rate at 5.51% for the period from May 2026 through October 2026. Series I bonds are government savings bonds that earn interest in two components: a fixed rate and an inflation-adjusted rate that changes every six months. The new rate applies to bonds purchased during the May-October 2026 period.

• CNBC — Treasury Department announces new Series I bond rate of 5.51% for the next six months

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