The last time the U.S. Treasury attached a fixed rate this generous to a Series I savings bond, Bear Stearns was still in business. On May 1, 2026, the Treasury set the I bond fixed rate at 0.90%, the highest guaranteed real return on these inflation-protected securities since November 2007, when the fixed rate was 1.20%. Combined with the current semiannual inflation adjustment, new I bonds carry a composite annual rate of 4.26%, according to the Treasury’s official rate announcement.
That 0.90% is permanently embedded in every bond purchased between now and October 31, 2026. It stays for the bond’s entire 30-year life. And for savers who have watched fixed rates sit at or near zero for most of the past decade, it represents a meaningful shift in what the government is willing to pay people to park their cash.
How the 4.26% rate breaks down
Every I bond rate has two components. The fixed rate (0.90% for this window) is locked in at purchase and never changes. The variable inflation component (currently 1.67% on a semiannual basis) resets every six months based on changes in the Consumer Price Index for All Urban Consumers (CPI-U). The Treasury’s composite formula roughly doubles the semiannual inflation figure and adds the fixed rate, producing the 4.26% annualized yield that applies for the first six months a new bond is held.
The fixed rate is the number long-term holders should focus on. When inflation cools, the composite rate drops, but owners still collect that 0.90% floor above whatever inflation turns out to be. When prices surge, the inflation component stacks on top of it. And if deflation ever takes hold, the composite rate can fall to zero but never below it, so the bond’s face value is protected regardless.
For comparison, Series EE savings bonds, the Treasury’s other major retail product, were set at a 2.40% fixed rate for the same May-through-October period, per the same Treasury announcement. EE bonds don’t adjust for inflation, but they do guarantee to double in value if held for 20 years.
Why 0.90% stands out: the historical picture
The historical rate table on TreasuryDirect tells the story clearly. Between November 2007 and April 2026, no I bond fixed rate reached 0.90%. During the pandemic-era buying frenzy of 2021 and 2022, when composite rates briefly topped 9% on surging inflation, the fixed rate was 0.00%. Bondholders from that era earned nothing beyond the inflation adjustment itself.
The May 2007 period, documented in the Treasury’s archived press release, carried a 1.30% fixed rate alongside a 3.74% composite. Today’s 4.26% composite actually exceeds that figure, even though the fixed rate was higher back then. The difference: the inflation component is doing more of the heavy lifting now. But for a buyer evaluating the next six months in isolation, the stated yield is higher than what was available during that earlier peak.
What matters more for long-term holders is the fixed rate’s staying power. Someone who bought at 1.30% in May 2007 has earned that real return above inflation for 19 years and counting. A buyer locking in 0.90% today is making a similar bet that a guaranteed real yield, backed by the U.S. government, is worth holding for years or decades.
How I bonds compare to bank accounts, CDs, and TIPS
High-yield savings accounts and short-term certificates of deposit have been competitive in recent years. As of May 2026, top-paying online savings accounts are advertising annual percentage yields in the range of 3.8% to 4.1%, according to rate trackers at DepositAccounts.com. One-year CDs from online banks are clustered in a similar range. Those are nominal rates, though, not inflation-adjusted, and banks can cut savings rates at any time. A CD locks a rate only until maturity, typically one to five years.
I bonds differ in several structural ways. The 0.90% fixed rate is a 30-year lock. The inflation adjustment resets automatically every six months, so purchasing power is protected without the saver needing to shop for a new product when a CD matures. I bond interest is exempt from state and local income taxes, and federal tax is deferred until the bond is redeemed (or reaches final maturity). If the proceeds are used for qualified higher education expenses, the interest may be entirely tax-free, a benefit no bank deposit matches.
Treasury Inflation-Protected Securities (TIPS), sold on the secondary market and at auction, also guard against inflation. As of late May 2026, the 5-year TIPS was yielding a real return of roughly 1.6% to 1.8%, according to Treasury yield curve data. That is a higher real yield than the I bond’s 0.90% fixed rate, but TIPS come with price volatility if sold before maturity, require a brokerage account, and pay interest that is taxable annually at the federal level. I bonds, purchased directly through TreasuryDirect.gov at face value, never lose principal and defer taxes until redemption.
Purchase limits, lockups, and the TreasuryDirect experience
I bonds come with constraints that savers need to weigh. The annual purchase limit is $10,000 per person in electronic bonds bought through TreasuryDirect. An additional $5,000 in paper I bonds can be purchased using a federal income tax refund, bringing the effective maximum to $15,000 per individual per calendar year. Married couples can each buy their own allocation, and bonds can also be purchased for children or registered as gifts (though gift bonds count against the recipient’s annual limit in the year they are delivered).
Liquidity is the main tradeoff. I bonds cannot be redeemed during the first 12 months after purchase. Cashing out between one and five years forfeits the last three months of interest. After five years, there is no penalty. For money that might be needed on short notice, a savings account remains more practical.
Then there is TreasuryDirect itself. The platform’s interface has been widely criticized for years. Navigation is clunky, the login process involves a virtual keyboard and security image, and the site occasionally goes down during high-traffic periods. The Treasury has acknowledged plans to modernize the system, but as of June 2026, buyers should expect a process that feels closer to a government form than a fintech app. It works, but patience helps.
To put the yield in dollar terms: a $10,000 I bond purchased in May 2026 at the current 4.26% composite rate would earn roughly $213 in its first six months, before the inflation component resets. The actual return over a full year depends on the next inflation adjustment, but the 0.90% fixed rate guarantees at least $90 per year in real return on that $10,000 regardless of where consumer prices go.
Why the window between May and October 2026 matters for long-term savers
The 0.90% fixed rate applies only to bonds purchased between May 1 and October 31, 2026. In November, the Treasury will announce a new fixed rate, and there is no guarantee it will be as high. Fixed rates have historically moved in both directions between announcement periods, sometimes sharply. The jump from 0.50% (November 2024) to 0.90% was itself a surprise to many rate watchers.
The case for buying in this window is strongest for savers who have at least $1,000 they won’t need for a year or more, who want inflation protection without market risk, and who haven’t already maxed out their 2026 purchase limit. For households already holding I bonds purchased during the zero-fixed-rate years of 2020 and 2021, the contrast is stark: those older bonds earn only the inflation adjustment with no fixed-rate cushion. New bonds bought before October 31 will outperform them in every inflation scenario.
No single savings product covers every need, and the $10,000 electronic purchase cap means I bonds alone won’t fund most households’ entire emergency reserves. But a 30-year guaranteed real yield of 0.90%, backed by the full faith and credit of the United States, with automatic inflation indexing and state tax exemption on top, is an offer the Treasury hasn’t made in nearly 19 years. The data on that is unambiguous. Whether the government will be this generous again in November is anyone’s guess.
