EE Bonds vs. I Bonds: What's the Difference?
Both sit in the same family of savings bonds, both get bought through the same kind of account, and both still manage to grow money in fundamentally different ways.
The short answer
EE bonds carry a fixed interest rate for their life and come with a specific government provision stating that their value will double over a set number of years, regardless of how that fixed rate alone would perform. I bonds carry a composite rate made up of a fixed portion plus an inflation-adjusted portion that changes periodically, designed to track rising prices rather than promise a specific multiple of the original purchase. The core difference is that one is built around a fixed, doubling-by-design structure and the other around ongoing inflation tracking.
How EE bonds are designed to grow
An EE bond earns a fixed rate set at purchase, and if held for the specified number of years required by that provision, the government makes up the difference so the bond’s value has doubled by that point even if the stated rate alone wouldn’t have gotten there. This gives an EE bond a knowable, calculable outcome at a specific horizon, which is part of what makes it attractive for a goal with a known target date far enough in the future to reach that horizon.
How I bonds are designed to grow
An I bond doesn’t carry a doubling provision. Instead, its return combines a fixed-rate component locked in at purchase with an inflation-adjusted rate that’s recalculated periodically based on measured price changes. This structure means an I bond’s total return isn’t a knowable, fixed multiple over any set period — it moves with actual inflation, for better or worse, which makes it a fundamentally different kind of design than what an EE bond offers.
Redemption rules and holding periods
Both bond types share a similar basic framework: neither can be redeemed within a short initial period after purchase, and redeeming either one within the first several years results in forfeiting a portion of recent interest as an early-redemption penalty. Held past that early window, both become freely redeemable, though — as with any matured savings bond — there’s no requirement to redeem right away, and value doesn’t erode simply from sitting unredeemed after the bond stops earning further interest.
Purchase limits and taxes
Both EE and I bonds are typically capped at modest annual purchase amounts per person, which places them firmly in the category of a savings tool rather than a way to hold a large portfolio. Interest on both types is generally not taxed until the bond is redeemed or reaches final maturity, deferring the tax event to a single point in the future rather than taxing interest annually as it accrues. These purchase limits and tax rules are set by policy and can change over time, so it’s worth checking current figures rather than relying on older numbers.
Which structure fits which goal
An EE bond’s appeal is its predictability for a specific future horizon — a known outcome reached by holding for the required period, useful for a goal with a fixed, distant target date. An I bond’s appeal is protecting purchasing power against inflation in the meantime, which suits money that needs to at least keep pace with rising costs without necessarily doubling by any particular date. Neither is a substitute for the other; they’re solving somewhat different problems even though they sit side by side as the two main types of savings bonds available today.
A practical habit
Because the two bond types reward patience differently — one through a fixed, set-horizon outcome, the other through ongoing inflation tracking — it helps to be clear about the actual goal and time frame before choosing between them, rather than assuming one is simply the newer or better version of the other. They’re better understood as two different tools built for two different jobs.