I Bond Rates Slip to 4.26% as Inflation Runs Hot Again

Gas up 3.8% in a year. Groceries up 3.2%. Those are the numbers driving people back to the Treasury's savings bond calculator this week, and the timing lines up almost too neatly with a fresh rate reset.

The Bureau of Labor Statistics reported that the consumer price index rose 3.8% over the twelve months through April, up from 3.3% in March, with the monthly gain marking the fastest pace since January 2025. Strip out food and energy and core CPI still ran at 2.8% annually, nowhere near the Fed's 2% target. That backdrop matters because Series I savings bonds exist for exactly this moment: a security whose return moves with the cost of living rather than sitting fixed while prices erode it.

The mechanics reset every six months, and the new numbers are out. Bonds issued from May through October carry a composite rate of 4.26%, according to TreasuryDirect, built from a 0.90% fixed-rate component that stays locked for the life of the bond plus a semiannual inflation adjustment recalculated from CPI-U data. That's actually a step up from the 4.03% rate that applied to bonds bought between last November and April, even though headline inflation has cooled from its recent peak in the interim, a reminder that the fixed piece and the inflation piece move somewhat independently.

The catch, as always, is liquidity. Money put into I bonds is locked up for a full year with no exceptions, and cashing out before five years costs the most recent three months of interest. There's also a hard ceiling: $10,000 per person, per calendar year, in electronic bonds through TreasuryDirect, which puts a low ceiling on how much of a portfolio this can realistically cover.

That combination, decent yield, government backing, but real friction on access, is why financial planners tend to frame I bonds as a supplement to an emergency fund rather than a substitute for one. High-yield savings accounts and short-term CDs remain more flexible, even if their rates now sit close to or below the I bond's composite yield. For someone with idle cash they won't need for at least a year, and ideally longer, the current rate offers a genuine hedge against a inflation print that just came in hotter than expected. For anyone who might need the money sooner, the lockup probably settles the question before the rate does. </body>