Treasury Lifts Series I Savings Bond Rate to 5.51% for Upcoming Six Months

Original summary · What happened

The United States Department of the Treasury announced that newly issued Series I savings bonds will carry a composite interest rate of 5.51% for purchases completed between November 1 and April 30. This marks an increase from the 4.26% annualized yield available through October. The newly determined rate incorporates a variable inflation-linked calculation of 4.08% alongside a fixed component of 1.40%, which represents the highest fixed base on the instrument since 2006.

The adjustment follows recent government price readings showing the headline consumer price index advancing 3.7% annually in September 2026, an acceleration from the 3.4% rate registered in August. As elevated consumer price metrics drive higher variable returns on government-backed inflation-protected debt, analysts suggest the higher yields may rekindle investor retail demand for low-risk Treasury assets.