The U.S. Treasury just gave savers a reason to log into TreasuryDirect. As of May 1, 2026, newly purchased Series I savings bonds earn a composite annual rate of 4.26%, the highest yield the government has offered on I bonds since the 5.27% rate set in November 2023. That rate applies to any bond bought between now and October 31, 2026, and each person can purchase up to $10,000 in electronic I bonds per calendar year.
For anyone sitting on cash in a savings account and wondering whether rates will hold, I bonds offer something most bank products cannot: a guaranteed floor that lasts up to 30 years, plus built-in inflation protection that adjusts every six months.
Where the 4.26% rate comes from
The Bureau of the Fiscal Service spelled out the new composite in its May 2026 rate announcement. Two pieces make up the number: a fixed rate of 0.90% and a semiannual inflation rate calculated from changes in the Consumer Price Index for All Urban Consumers (CPI-U). The Treasury used the percentage change in CPI-U between September 2025 and March 2026 to set the inflation component.
Combining those two pieces is not straightforward addition. Under 31 CFR 359.14, the composite formula blends the fixed rate with twice the semiannual inflation rate, plus a small cross-product of the two. Interest accrues monthly and compounds every six months, so returns build gradually rather than arriving as a lump sum.
The fixed rate deserves extra attention. Once you buy a bond, that 0.90% base stays with it for up to 30 years, even as the inflation component resets every May and November. By comparison, the November 2023 bonds locked in a 1.30% fixed rate, while bonds issued during parts of 2020 and 2021 carried a fixed rate of zero. Today’s 0.90% is lower than the late-2023 peak, which means a larger share of the current 4.26% composite depends on inflation staying elevated. But that permanent floor still guarantees your bond keeps earning something meaningful even if consumer prices flatten out entirely.
What $10,000 actually earns
A buyer who invests the full $10,000 electronic limit in May 2026 would earn approximately $426 in interest over the first 12 months if the composite rate held steady for both six-month periods. In practice, the inflation component will reset on November 1, 2026, so the second half of that first year could be higher or lower. The fixed portion, however, stays at 0.90% regardless.
Liquidity is the main trade-off. I bonds cannot be redeemed at all during the first 12 months. After that, you can cash out, but redeeming before five years triggers a penalty equal to the last three months of accrued interest. On a $10,000 bond earning around 4.26%, that penalty would be roughly $106 in the early years. After five years, the penalty disappears and you collect every dollar of accrued interest.
There are also ways to stretch beyond the $10,000 electronic cap. You can purchase an additional $5,000 in paper I bonds by directing a federal tax refund through IRS Form 8888. Married couples filing jointly can each buy $10,000 electronically. Parents can open TreasuryDirect accounts for minor children, each with its own $10,000 annual limit. Gift bonds can be purchased now for delivery in a future calendar year, effectively front-loading purchases.
I bonds vs. savings accounts and CDs
As of late May 2026, top-paying online savings accounts and one-year certificates of deposit are advertising annual percentage yields in the mid-4% range, according to rate trackers like FDIC national rate data and Bankrate. On the surface, those products look competitive with the 4.26% I bond composite. But the comparison shifts once you account for rate risk and taxes.
Bank savings rates can drop at any time. A high-yield account paying 4.30% today could slip to 3.50% by autumn if the Federal Reserve cuts its benchmark rate. The I bond composite, by contrast, is locked for six months from the date of purchase, and the 0.90% fixed rate is locked for the life of the bond. That structure gives I bond holders a degree of rate certainty that no variable-rate bank product can match.
Tax treatment widens the gap. I bond interest is exempt from state and local income taxes, and federal tax can be deferred until you redeem the bond or it reaches final maturity at 30 years. If the proceeds are used for qualified higher-education expenses and the bondholder meets income limits, the interest may be excluded from federal tax entirely. Interest earned in a bank savings account or CD is typically taxable at both the federal and state level in the year it is credited. For a saver in a state with a 5% income tax rate, that difference alone can add meaningful after-tax yield to the I bond.
The flip side is access. A savings account lets you withdraw funds the same day. A one-year CD ties up money for 12 months but usually charges only a modest early-withdrawal penalty. An I bond locks your principal for a full year with zero access, then imposes the three-month interest penalty for the next four years. If there is any chance you will need the cash within 12 months, I bonds are the wrong vehicle.
How I bonds stack up against TIPS and Series EE bonds
Investors focused on inflation protection may also consider Treasury Inflation-Protected Securities, commonly known as TIPS. Like I bonds, TIPS adjust for changes in CPI-U, but the two products work differently. TIPS trade on the secondary market, so their prices fluctuate with interest rates, and they pay semiannual coupon interest that is taxable in the year it is received. I bonds, by contrast, cannot lose nominal value, do not trade on any market, and allow federal tax deferral until redemption. TIPS also have no annual purchase cap, making them more practical for larger allocations, while I bonds are capped at $10,000 in electronic purchases per person per year. For smaller savers who want simplicity, no market risk, and state tax exemption, I bonds hold a clear edge. For investors with larger portfolios who need liquidity or want to hold inflation protection inside a brokerage account, TIPS fill a different role.
The same May 2026 announcement set the Series EE bond rate at 2.40%, roughly half the I bond composite. EE bonds do not adjust for inflation, so that 2.40% is the rate for the life of the bond unless the Treasury’s 20-year doubling guarantee kicks in. If held for a full 20 years, an EE bond is guaranteed to at least double in value, which works out to a minimum effective annual return of about 3.5%. For savers with a very long time horizon and a specific goal like funding education, EE bonds fill a niche. For anyone focused on near- to medium-term purchasing-power protection, the I bond is the stronger choice right now.
Why locking in 0.90% fixed before November could pay off for years
The biggest question mark is what happens at the next rate reset on November 1, 2026. The inflation component will be recalculated using CPI-U data from March through September 2026, numbers that will not be fully available until mid-October. If consumer prices cool over the summer, the next composite could fall well below 4.26%. If inflation accelerates, it could rise. The fixed rate is even harder to forecast: the Treasury sets it as a policy decision, not a formula output, and has never publicly explained how it arrives at the number.
Buying now locks in the 0.90% fixed rate permanently. Waiting until November preserves the option to act on a potentially higher fixed rate, but it also risks a lower composite if inflation eases and the fixed rate stays flat or drops.
For savers who have already decided they want I bonds in 2026, every month of delay is a month of 4.26% interest foregone, and the 0.90% fixed rate is not guaranteed to appear again. Purchases are made through TreasuryDirect.gov, the Treasury’s online portal. First-time buyers should allow a few business days for account verification before they can complete a purchase.
Vince Coyner is a serial entrepreneur with an MBA from Florida State. Business, finance and entrepreneurship have never been far from his mind, from starting a financial education program for middle and high school students twenty years ago to writing about American business titans more recently. Beyond business he writes about politics, culture and history.
