When inflation hit 9% in 2022, I-bonds went from obscure government instruments to the most talked-about savings vehicle in America. And then, when rates dropped, most people forgot about them. That was a mistake.
I-bonds are still one of the safest ways to beat inflation on a portion of your savings — if you understand how they work, when they make sense, and when they don't.
What Are I-Bonds?
I-bonds (Series I Savings Bonds) are government-backed savings bonds issued by the U.S. Treasury. They're designed specifically to protect against inflation. The "I" stands for inflation.
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Unlike most bonds, I-bonds don't fluctuate in value. You will never lose principal. The bond earns interest, and that interest is adjusted based on inflation every six months.
How the I-Bond Interest Rate Works
- Fixed rate: Set at purchase, stays with the bond forever.
- Inflation rate: Adjusts every 6 months based on CPI. This is what makes I-bonds inflation-indexed.
These two rates combine to create your composite rate. When inflation is high, your I-bond rate is high. When inflation falls, the rate falls too — but the principal never decreases.
Rates adjust every May 1 and November 1. The new rate applies for 6 months from your bond's purchase anniversary — not the announcement date.
I-Bond Purchase Limits
- $10,000 per person per year in electronic form via TreasuryDirect
- Additional $5,000 per year in paper bonds via your tax refund (IRS Form 8888)
- Married couple: up to $20,000/year ($10k each)
- No secondary market — you buy directly from the Treasury
Lock-Up Period and Penalties
12-Month Lock-Up
You cannot redeem an I-bond within the first 12 months. If you might need this money sooner, compare to a high-yield savings account instead.
3-Month Interest Penalty (Months 12–60)
Redeem before 5 years and you forfeit the last 3 months of interest. On $10,000 that's typically $150–$300.
After 5 Years: No Penalty
Hold up to 30 years with no penalties after the 5-year mark.
Taxes on I-Bonds
- Federal income tax: Deferred until you redeem — nothing owed each year while holding
- State and local taxes: Exempt — meaningful if you're in California, New York, or other high-tax states
- Education use: Potentially tax-free if used for qualified education expenses (income limits apply)
How to Buy I-Bonds
- Go to TreasuryDirect.gov
- Open an account (SSN, bank account, email required)
- Navigate to "BuyDirect" → Series I
- Enter amount and confirm
- Bond appears in your account within 1 business day
When I-Bonds Make Sense
- Inflation is elevated and the rate is competitive
- You have cash you won't need for 12+ months
- You want guaranteed principal protection with zero market risk
- Building a reserve for something 1-5 years out (house down payment, career transition fund)
- High state-tax bracket — the exemption adds real after-tax value
When I-Bonds Don't Make Sense
- Money you might need within 12 months
- As your primary investment vehicle — the cap limits total impact
- When inflation is low and HYSA rates are competitive on liquidity
- Instead of long-term equity investing for wealth building
I-Bonds vs. TIPS vs. HYSA
| Feature | I-Bonds | TIPS | HYSA |
|---|---|---|---|
| Inflation protection | Direct (indexed) | Direct (indexed) | Indirect |
| Principal at risk | No | Yes (price moves) | No (FDIC) |
| Liquidity | 12-month lock-up | Tradeable daily | Instant |
| Annual limit | $10,000 | Unlimited | Unlimited |
| State taxes | Exempt | Not exempt | Not exempt |
The Practical Use Case
The clearest use case: $10,000 earmarked for something 2-4 years away. You don't want market risk, but you don't want inflation eroding your purchasing power either. I-bonds solve that directly — federal backing, inflation indexing, state tax exemption. Worth pairing with a CD ladder strategy as part of a broader safe-money allocation.
The Bottom Line
I-bonds aren't glamorous. They won't make you rich. But for a $10,000 slice of your savings earmarked for 1-5 years out, they offer principal safety with a built-in inflation hedge. In a world where most "safe" savings vehicles lose to inflation over time, that's worth knowing about.
Frequently Asked Questions
What are I-Bonds and how do they work?
I-Bonds are US government savings bonds that earn interest tied to inflation (CPI). The interest rate adjusts every 6 months. You buy them at TreasuryDirect.gov for as little as $25. They protect your savings from inflation and are exempt from state and local income tax. Interest is deferred until redemption.
What are the limits and restrictions on I-Bonds?
You can buy up to $10,000 in electronic I-Bonds per person per year (plus $5,000 in paper bonds via a tax refund). You must hold them for at least 12 months before redeeming. If you redeem within 5 years, you forfeit the last 3 months of interest. After 5 years, you can redeem with no penalty.
Are I-Bonds better than a high-yield savings account?
When inflation is high (as in 2022–2023), I-Bonds significantly outperform HYSAs. When inflation falls, HYSA rates often catch up or exceed I-Bond rates. I-Bonds are less liquid (12-month lock-up), so they work best for money you will not need for at least a year but want protected from inflation.
Related: CD ladders for guaranteed returns.
