I Bond (Series I Savings Bond)
Quick Definition
A U.S. government savings bond with inflation protection, combining a fixed rate with a variable rate that adjusts every 6 months based on CPI.
What Is I Bond (Series I Savings Bond)?
Series I Savings Bonds (I Bonds) are U.S. government-issued savings bonds designed to protect investors from inflation. Their interest rate has two components: a fixed rate (set at purchase and lasting for the bond's life) and an inflation rate (reset every 6 months based on the Consumer Price Index for All Urban Consumers, CPI-U). These rates are combined to calculate the composite rate. I Bonds gained massive popularity in 2022 when inflation surged and the composite rate hit 9.62% — the highest since their introduction in 1998. Purchase limits are $10,000 per person per year electronically (via TreasuryDirect) plus $5,000 in paper form using tax refunds. I Bonds earn interest for 30 years, but can be redeemed after 12 months (with a 3-month interest penalty if redeemed within 5 years). They are exempt from state and local income taxes, and federal taxes can be deferred until redemption. I Bonds are virtually risk-free, backed by the U.S. government, making them an ideal inflation hedge for conservative investors.
I Bond (Series I Savings Bond) Example
- 1In November 2022, I Bonds offered 6.89% composite rate (0% fixed + 6.89% inflation) — far exceeding savings account rates
- 2Buying $10,000 in I Bonds annually for 5 years builds a $50,000+ inflation-protected savings reserve earning competitive real returns
Related Terms
TIPS (Treasury Inflation-Protected Securities)
U.S. Treasury bonds whose principal adjusts with inflation (CPI), protecting investors from the erosion of purchasing power.
Inflation-Protected Bond
A bond whose principal or coupon adjusts with inflation, preserving the investor's purchasing power regardless of price level changes.
Treasury Bond (T-Bond)
A long-term U.S. government debt security with a maturity of 20 or 30 years, paying semiannual coupon interest.
Real Yield
The return on a bond after adjusting for inflation, representing the actual increase in purchasing power for the investor.
Bond
A fixed-income debt security where investors loan money to an issuer in exchange for regular interest payments and return of principal at maturity.
Yield Curve
A graphical representation of interest rates across different maturities for bonds of similar credit quality, typically U.S. Treasuries.
Expand Your Financial Vocabulary
Explore 130+ financial terms with definitions, examples, and formulas
Browse Bonds & Fixed Income Terms