I Bonds Explained: Are They Still Worth Buying?

In 2022, I bonds paid a record 9.62% and Americans poured billions into them. Then rates fell and many investors lost interest. Now, in 2026, I bonds are paying 4.26% with a 0.90% fixed rate that lasts for 30 years. That fixed rate guarantees a return 0.90% above inflation for three decades. With CPI jumping to 3.3% in March 2026, the highest in nearly three years, I bonds are back on the radar for anyone looking for a safe, inflation-protected place to park cash.

I bonds are not a replacement for stocks or a get-rich-quick scheme. They are a safe, government-backed savings vehicle that protects against inflation. They have strict rules: a $10,000 annual purchase limit, a one-year lockup, and a three-month interest penalty if redeemed within five years. Understanding these rules is essential before buying.

This post covers what I bonds are, how the rate works, the current 2026 rate, the rules and restrictions, how I bonds compare to other safe savings options, and whether they are worth buying.

What Are I Bonds?

Series I Savings Bonds are debt instruments issued by the US Treasury. They are backed by the full faith and credit of the US government, which means zero credit risk. They are designed to protect against inflation and have an interest-earning life of 30 years.

I bonds are purchased through TreasuryDirect.gov (electronic) or with your tax refund (paper, up to $5,000). The minimum purchase is $25 for electronic bonds. The annual purchase limit is $10,000 per person in electronic bonds plus $5,000 in paper bonds via tax refund, for a total of $15,000 per person per year. A married couple can buy $30,000 per year combined.

How the Rate Works

The I bond rate has two components. The fixed rate is set at purchase and stays the same for the 30-year life of the bond. The current fixed rate is 0.90% as of May 2026. The inflation rate adjusts every 6 months based on CPI-U data. The current semiannual inflation rate is 1.67%.

The composite rate formula is: fixed rate plus (2 times semiannual inflation rate) plus (fixed rate times semiannual inflation rate). For May 2026, this works out to 0.90% plus 3.34% plus 0.015%, equaling a composite rate of 4.26%.

The composite rate applies for 6 months from the purchase date, then adjusts to the next inflation rate. The fixed rate is permanent. If you buy in May 2026, your fixed rate of 0.90% lasts for 30 years.

The Rules and Restrictions

The One-Year Lockup

You cannot redeem I bonds for at least 12 months after purchase. No exceptions, except for specific emergency scenarios like federal disaster declarations. This makes I bonds unsuitable for your primary emergency fund.

The Three-Month Interest Penalty

If you redeem within 5 years, you forfeit the last 3 months of interest. After 5 years, there is no penalty. If you buy in May 2026 and redeem in May 2029, you lose the interest earned in February, March, and April 2029. This makes I bonds best for money you will not need for at least 1 year, and ideally 5 or more years.

The Purchase Limit

$10,000 per person per year in electronic bonds via TreasuryDirect. $5,000 per person per year in paper bonds via tax refund overpayment. Total: $15,000 per person per year. A married couple can buy $30,000 combined. You can also buy for children, trusts, and businesses, effectively increasing the limit. According to CNBC's rate analysis, the purchase limit is the main constraint for investors who want to allocate more to inflation-protected savings.

Tax Treatment

Interest is exempt from state and local income tax, which is an advantage over CDs and savings accounts in high-tax states. Federal income tax on interest can be deferred until redemption or reported annually. If used for qualified education expenses (income limits apply), interest may be entirely tax-free. According to Kiplinger's I bond analysis, the state tax exemption makes I bonds particularly attractive in states like California and New York.

I Bonds vs Other Safe Savings Options

I Bonds vs High-Yield Savings Accounts

I bonds offer 4.26% (May through October 2026), inflation protection, a 30-year fixed component, a 1-year lockup, a $10,000 limit, and state tax exemption. High-yield savings accounts offer 4.25 to 5.25% APY in 2026, full liquidity, no limit, and both state and federal tax on interest. The HYSA wins on liquidity and flexibility. The I bond wins on inflation protection and long-term safety.

I Bonds vs CDs

I bonds have a variable rate that adjusts every 6 months, inflation protection, a 30-year term, state tax exemption, and a $10,000 limit. CDs offer a fixed rate for the term (3 to 60 months), with 2026 rates ranging from 4.0 to 5.5%, an early withdrawal penalty of 3 to 6 months interest, no purchase limit, and both state and federal tax. CDs win on guaranteed rates and no purchase limit. I bonds win on inflation protection and tax advantages.

I Bonds vs Treasury Bills

I bonds have a $10,000 limit, 1-year lockup, inflation protection, state tax exemption, and a 30-year term. Treasury bills have no purchase limit, terms from 4 weeks to 52 weeks, state and local tax exemption, are sold at a discount, and are liquid at maturity. T-bills win on flexibility and no limit. I bonds win on long-term inflation protection and the fixed rate component.

I Bonds vs TIPS

I bonds have a $10,000 limit, are savings bonds, have a 1-year lockup, a 3-month penalty under 5 years, and tax deferral. TIPS (Treasury Inflation-Protected Securities) have no purchase limit, are marketable securities, can be sold anytime, have principal that adjusts with CPI, and have no fixed rate above inflation (the real yield is determined by the market). TIPS win for larger amounts and liquidity. I bonds win for simplicity, the fixed rate floor, and tax deferral.

The Fixed Rate Strategy

The fixed rate is the most important component for long-term investors. The current 0.90% fixed rate means your I bond will earn 0.90% above inflation for 30 years, guaranteed.

Historical fixed rates show why timing matters. In May 2022, the fixed rate was 0.00%, but the composite rate was 9.62% due to high inflation. In November 2022, it rose to 0.40%. In May 2023, it jumped to 0.90%. In November 2023, it peaked at 1.30%. In May 2024, it was 1.10%. In November 2024, 1.20%. In May 2025, 1.10%. In November 2025, it dropped back to 0.90%. In May 2026, it remained at 0.90%.

The strategy: buy I bonds when the fixed rate is high (1.0% or above). The fixed rate is permanent for 30 years. A 1.30% fixed rate from November 2023 guarantees 1.30% above inflation for 30 years. The Treasury adjusts the fixed rate every May 1 and November 1. Watch these dates.

I Bonds vs Other Safe Savings Options (2026)

Real-World Examples

Example: Aisha, 30, buying I bonds in May 2026

Situation: Aisha buys $10,000 in I bonds in May 2026 at the 4.26% composite rate with a 0.90% fixed rate. After 1 year, she has earned approximately $426. The rate adjusts every 6 months based on inflation.

Result: If inflation averages 3% over the next 10 years, her I bonds earn approximately 3.9% annually (0.90% fixed plus approximately 3% inflation). After 10 years, the $10,000 grows to approximately $14,700, state tax-free, federally tax-deferred. If she had put the same $10,000 in a savings account averaging 3.5%, she would have approximately $14,100, but owed state and federal tax each year.

Example: Marcus and Jen, 35, married couple buying I bonds over 3 years

Situation: Marcus and Jen buy $20,000 in I bonds per year ($10,000 each) for 3 years starting in 2026. Total invested: $60,000. They also buy $5,000 each via tax refund overpayment (paper bonds), adding $10,000 per year. Total over 3 years: $90,000.

Result: They plan to hold for 10 or more years as a secondary emergency fund. The 0.90% fixed rate guarantees a real return above inflation for 30 years. If they need the money after 5 years, there is no penalty. If they need it between 1 and 5 years, they lose 3 months of interest. The TreasuryDirect website interface is clunky and frustrating, but the inflation protection is worth the hassle.

Common Mistakes

Buying I bonds with your emergency fund. You cannot access the money for 12 months. Keep your primary emergency fund in a high-yield savings account. I bonds work as a secondary layer for money you are confident you will not need for at least a year.

Not understanding the rate composition. The 4.26% composite rate changes every 6 months. Only the 0.90% fixed rate is permanent. Do not assume the current composite rate will last.

Ignoring the fixed rate. The fixed rate is what makes I bonds valuable long-term. Buy when the fixed rate is high (1.0% or above). The November 2023 fixed rate of 1.30% was the best in years.

Forgetting the 3-month penalty. If you redeem within 5 years, you lose the last 3 months of interest. Plan to hold for at least 5 years.

Not using the tax refund trick. You can buy an additional $5,000 in paper I bonds by overpaying your taxes and requesting the refund as I bonds. This increases your annual limit from $10,000 to $15,000.

Comparing I bonds to stocks. I bonds are a safe savings vehicle, not an investment. They protect against inflation, not against opportunity cost. For long-term growth, see our guide on the three-fund portfolio.

I bonds are worth buying in 2026 if you want a safe, inflation-protected, government-backed savings vehicle. The 0.90% fixed rate guarantees a real return above inflation for 30 years. The 4.26% composite rate is competitive with HYSAs and CDs, with the added benefits of state tax exemption and inflation protection. The drawbacks are the $10,000 annual limit, the 1-year lockup, and the 3-month penalty under 5 years.

I bonds are not a replacement for your emergency fund or your investment portfolio. They are a complement. Use them for money you will not need for 1 to 5 years, as a secondary safety net that protects against inflation. The fixed rate is the key. Buy when it is high.

If you have $10,000 you will not need for at least a year, buy I bonds at TreasuryDirect.gov. The 0.90% fixed rate is locked in for 30 years. Then read our guide on Treasury bills for another government-backed savings option, and our overview of Treasury bonds for the full picture. For understanding where I bonds fit in your overall portfolio, see our guide on asset allocation. And if you are building an emergency fund, read our guide on how to build an emergency fund to see how I bonds fit as a secondary layer.

This post is for informational purposes only and does not constitute financial or investment advice. I bond rates change every six months. Verify current rates at [TreasuryDirect.gov](https://treasurydirect.gov) before purchasing.