What Are I Bonds and How Do They Work?
I Bonds are savings bonds issued by the U.S. Department of the Treasury. The "I" stands for "inflation," which is the main reason these bonds exist. When you buy an I Bond, you're lending money to the federal government, and in return, the government pays you interest over time. This interest rate changes every six months based on inflation rates in the United States.
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The way I Bonds earn money is different from regular savings accounts. Instead of earning a fixed interest rate that stays the same, I Bond rates adjust twice yearly—in May and November. The interest rate has two parts: a fixed rate that never changes during the life of your bond, and an inflation rate that adjusts based on the Consumer Price Index (CPI). The total of these two rates is what you earn.
For example, if you bought an I Bond in May 2024, you would receive whatever composite rate was announced for that period. In recent years, I Bond rates have been notably higher than many traditional savings options. In May 2024, the rate was 5.27 percent. In May 2023, it was 4.30 percent. These rates reflect the inflation environment at the time bonds are purchased.
I Bonds must be held for at least one year before you can redeem them. If you cash in your bond within the first five years, you'll lose the last three months of interest as a penalty. After five years, you can redeem without this penalty. Bonds continue earning interest for up to 30 years, though most people cash them in well before that time.
Practical takeaway: I Bonds are inflation-protected savings tools where your interest rate adjusts twice per year based on the economy. Understanding how the two-part interest rate works helps you see why I Bonds can be valuable when inflation is high.
Understanding the Costs Associated with I Bonds
One of the primary costs to understand with I Bonds is the early redemption penalty. If you redeem an I Bond within the first five years of ownership, you lose the last three months of interest. This is not a fee taken out—it's a reduction in the total interest you've earned. For example, if you bought a bond, held it for two years, and earned $50 in interest, you would lose the interest from the most recent three months, potentially reducing your return by $10 to $15 depending on the rates at that time.
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The second cost to consider is opportunity cost. I Bonds have a one-year holding requirement, meaning you cannot access your money for at least twelve months without penalty. During that year, your money is locked in this investment. If you need the money for an emergency within that period, you cannot get it without losing money. Additionally, after the first year, you can redeem anytime, but you still face the three-month interest penalty if you sell within five years.
Inflation risk is another consideration, though it works differently than traditional costs. Since I Bond rates change every six months, if inflation drops significantly, your interest rate drops too. The fixed portion of your rate stays constant, but the inflation portion adjusts downward. In periods of low inflation, I Bonds may earn less than other investments. For instance, if the inflation component becomes negative (which happened in 2022), your overall rate could drop to just the fixed rate, which might be lower than alternatives like high-yield savings accounts.
There are also practical costs related to how I Bonds are purchased. They are only sold through TreasuryDirect.gov, the official government website. You cannot buy them through a bank or broker. This means you need to set up and manage an account online yourself. There is no cost to set up the account, but it does require some effort and an understanding of how to navigate the website.
Tax considerations represent another financial factor. Interest earned from I Bonds is subject to federal income tax but exempt from state and local taxes. You don't pay taxes yearly on the interest—you pay when you redeem the bond or when it matures. For some people, this deferral of taxes is an advantage. For others who want annual tax deductions, it's not helpful.
Practical takeaway: The main costs of I Bonds are the early redemption penalty (three months of interest if cashed within five years), the one-year lockup period, the risk that inflation drops and your returns decrease, and the requirement to manage them through an online account. Understanding these costs helps you decide if I Bonds fit your financial situation.
Purchase Limits and How Much You Can Invest
The U.S. Treasury sets annual purchase limits on I Bonds to prevent any single person from buying too many. In 2024, you can purchase up to $10,000 in I Bonds per calendar year through TreasuryDirect. This is the standard limit for electronic I Bond purchases. However, there is an additional way to purchase up to $5,000 more per year using your federal income tax refund, bringing the total annual maximum to $15,000.
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The $10,000 limit is per person, not per household. This means if you're married, both spouses can each purchase $10,000 separately, for a total of $20,000 per year for the household. Similarly, if you have minor children, you can purchase bonds on their behalf up to the same limits. This family structure allows larger household investments in I Bonds while respecting individual limits.
The tax refund option works differently. When you file your federal income tax return, you can choose to use part of your refund to purchase I Bonds. You can purchase up to $5,000 of I Bonds this way each year, but only if you're receiving a refund. If you owe taxes instead of receiving a refund, this option isn't available to you. The I Bonds purchased this way are paper bonds delivered by mail, which is different from electronic bonds purchased through TreasuryDirect.
Once you've purchased your I Bonds, the limits reset on January 1st each year. If you bought $10,000 worth in March, you could purchase another $10,000 on January 1st of the following year. However, bonds purchased in different years are tracked separately and mature at different times based on when they were issued.
The minimum purchase amount is $25 for electronic I Bonds, and you can purchase in $25 increments. This means you could buy $25, $50, $75, or any amount up to the $10,000 annual limit, as long as it's in increments of $25. For tax refund bonds, the minimum is $50 and they go up in $50 increments.
Practical takeaway: You can purchase up to $10,000 per person per year in I Bonds online, plus up to $5,000 more using a tax refund. Understanding these limits helps you plan how much you might want to invest and whether involving family members makes sense for your savings goals.
Comparing I Bond Costs to Other Savings Options
To understand whether I Bond costs are reasonable, it helps to compare them to other common savings products. High-yield savings accounts (HYSA) offered by online banks currently pay interest rates ranging from 4 to 5 percent annually as of 2024. These accounts have no lockup period—you can withdraw money anytime without penalty. They also have FDIC insurance up to $250,000, meaning your money is protected by the federal government if the bank fails. However, high-yield savings accounts are fully taxable, meaning you pay federal income tax on the interest every year.
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Regular savings accounts at traditional banks typically pay 0.01 to 0.50 percent interest annually. This is far lower than both I Bonds and high-yield savings accounts. The advantage is complete liquidity—you can withdraw anytime without any penalty. These accounts also offer FDIC insurance and physical branch access if that matters to you.
Money market accounts are similar to savings accounts but sometimes offer slightly higher rates, typically 0.5 to 2 percent. Like savings accounts, they offer FDIC insurance and liquidity, but the rates are still generally lower than current I Bond rates.
Certificates of Deposit (CDs) are another comparison point. CDs typically offer fixed rates ranging from 4 to 5 percent for one-year terms. Like I Bonds, CDs have an early withdrawal penalty if you take money out before maturity. However, CDs have a major advantage: you know exactly what interest rate you'll earn for