I Bond Holders: Your Rate Is Going Up—Here’s How Much and When

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Inflation isn’t usually welcome news—but if you own I bonds, the latest surge brings a modest upside.

The latest Consumer Price Index report shows inflation jumping to 3.3% in March after holding at 2.4% the previous two months, fueled largely by a surge in oil and gas prices tied to the Iran conflict. Because I bond yields are linked directly to inflation, that increase is set to push your next rate higher.

With the latest CPI data now in hand, it’s possible to calculate the new variable rate that will be announced by the Treasury on May 1. The inflation component is expected to rise from 3.12% to about 3.34%, reflecting the recent uptick in consumer prices.

That increase translates to roughly a quarter-percentage-point boost in the composite rate for existing I bonds over the next six months.

Those who already own an I bond will enjoy a modest boost in earnings for six months. Beyond that, future gains will hinge on where inflation go from here—especially energy costs.

As a refresher, every I bond earns a composite rate made up of two parts: a fixed rate, which is locked in when you buy your bond, and a variable rate, which adjusts every six months based on inflation—hence the “I” in I bonds. While the fixed rate on your existing bond never changes, the new inflation component will be added to it to determine your updated yield.

Below, we’ve broken down the estimated new six-month rates for I bonds issued in recent years, so you can see exactly how your return is expected to change.

You can find every six-month rate for all I bond issue dates going back to 1998 in the U.S. Treasury’s I Bond Rate Chart.

When the Treasury announces new I bond rates on May 1, not everyone will start earning that rate right away. Instead, the timing depends on when you originally purchased your bond.

I bond rates reset every six months, based on your bond’s issue date. That means only bonds issued in May or November will begin earning the new rate immediately on May 1. For all other issue months, the updated rate will take effect on a delayed schedule over the following months.

The chart below shows exactly when your next rate change will kick in, based on your bond’s purchase month.

Put another way, every I bond earns each rate for a full six months before moving to the next one—the only difference is when your next rate period begins.

While the next I bond rate is now essentially locked in, what happens after that is far less certain.

The Treasury’s Nov. 1 rate will be based on inflation readings from April through September—data that won’t be fully known until mid-October. Until then, it’s impossible to say with confidence whether I bond rates will rise again, fall back, or hold steady.

A major wildcard is the ongoing conflict with Iran, which has already pushed oil and gas prices sharply higher and driven March’s inflation surge. Economists warn that continued disruptions to global energy supplies could keep inflation elevated, while a resolution could just as quickly ease price pressures.

That leaves I bond holders in a wait-and-see position. If inflation readings remain elevated in the coming months, another rate increase could be on the table in November. But if energy prices stabilize or decline, the next adjustment could move lower instead.

New bonds issued after May 1 are expected to offer a similar overall rate to those purchased in the past six months, but we’ll break down what that means for buyers in a separate analysis.

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