Series I Bonds: Are They Still Worth Buying?

In 2022, Series I Savings Bonds became the hottest investment in America. With inflation soaring, these government-backed bonds offered a staggering 9.62% annualized return. Headlines were everywhere, and the TreasuryDirect website even crashed due to the traffic. But the economic climate has shifted dramatically as we move through 2024. Inflation has cooled, and interest rates on other safe assets have risen. This leaves many investors asking a critical question: Do I-Bonds still belong in your portfolio?

The Current Numbers: November 2024 Rates Explained

To understand the value of an I-Bond, you have to look at how the interest is calculated. The Treasury Department sets a new rate every six months, specifically on May 1 and November 1.

The composite rate (the money you actually earn) is a combination of two distinct numbers:

  1. The Fixed Rate: This rate stays the same for the entire 30-year life of the bond.
  2. The Inflation Rate: This changes every six months based on the Consumer Price Index (CPI-U).

As of November 1, 2024, the composite rate for new I-Bonds is 3.11%.

At first glance, 3.11% looks disappointing compared to the 9.62% peak of yesteryear. However, you need to look closer at the Fixed Rate. For bonds bought between November 2024 and April 2025, the fixed rate is 1.20%.

This is historically significant. During the high-yield craze of 2022, the fixed rate was 0.00%. That meant those bonds only paid out based on inflation. If inflation dropped to zero, those bonds would earn zero. The current 1.20% fixed rate guarantees that your money will always grow by 1.20% above the rate of inflation. This makes the current tranche of I-Bonds a much stronger long-term hold than the viral bonds of 2022.

Comparison: I-Bonds vs. High-Yield Savings and CDs

To decide if I-Bonds are competitive, we must compare them to other “safe” places to park your cash in late 2024.

High-Yield Savings Accounts (HYSAs)

Online banks are currently fighting for deposits. As of late 2024, many competitive accounts are offering APYs between 4.00% and 5.00%.

  • Wealthfront: Offers roughly 5.00%.
  • Marcus by Goldman Sachs: Offers around 4.10% to 4.40% (depending on bonuses).
  • Ally Bank: Consistently hovers near the 4.00% mark.

Verdict: For pure current income, a HYSA wins. You get a higher rate immediately, and your money is liquid. You can withdraw it tomorrow if you need it.

Certificates of Deposit (CDs)

If you are willing to lock your money away, 1-year CDs are currently paying in the 4.00% to 4.50% range at institutions like Barclays or Capital One 360.

Verdict: CDs currently beat the 3.11% I-Bond rate for short-term growth (12-18 months).

The “Real Return” Factor

While HYSAs and CDs have higher nominal numbers right now, they do not guarantee purchasing power. If inflation spikes back up to 5% next year, your 4.5% CD is actually losing value in real terms. The I-Bond, with its 1.20% fixed component, guarantees you will beat inflation regardless of how high it goes.

The Liquidity Trap: When Can You Access Your Money?

I-Bonds are not for your emergency fund if you might need the cash next week. They come with strict liquidity rules that distinguish them from a savings account.

  1. The 1-Year Lock: You strictly cannot cash out your I-Bond for one year after purchase. The money is frozen.
  2. The 5-Year Penalty: If you sell the bond before holding it for five years, you forfeit the last three months of interest.

For example, if you sell after 18 months, you only keep the interest earned during the first 15 months. This penalty makes I-Bonds a poor choice for money you plan to use for a vacation next summer.

The Tax Superpower

One area where I-Bonds destroy the competition is taxation. Interest earned on savings accounts and CDs is fully taxable at both the federal and state levels.

I-Bonds offer two distinct tax advantages:

  • State and Local Tax Exemption: You pay zero state or local income tax on I-Bond interest. If you live in a high-tax state like California, New York, or Oregon, this creates a massive difference in your “effective” return. A 4.5% bank rate in New York City might effectively be closer to 4.0% after state and city taxes are removed. The I-Bond keeps its full value.
  • Federal Tax Deferral: You do not have to pay federal taxes on the interest until you cash the bond or it matures (30 years). This allows your interest to compound tax-free for decades. With a bank CD, you must pay taxes on the interest every single year.

Education Savings Usage

There is a specific scenario where I-Bonds become unbeatable. If you use the proceeds for qualified higher education expenses, the interest may be completely tax-free at the federal level as well.

To qualify for this exclusion:

  • You must be at least 24 years old on the first day of the month in which you bought the bond.
  • Your modified adjusted gross income (MAGI) must be below certain thresholds (check IRS Form 8815 for the current year’s limits).

This effectively turns the I-Bond into a tax-free investment vehicle similar to a 529 plan but with principal protection backed by the US Treasury.

Conclusion: Who Should Buy in 2024?

The days of the “get rich quick” 9.62% I-Bond are over. The 3.11% headline rate is underwhelming compared to a 5.00% savings account. However, smart investors look past the headline.

You should buy I-Bonds now if:

  • You are building a long-term tier of your emergency fund (money you won’t touch for 5+ years).
  • You want insurance against future inflation spikes. The 1.20% fixed rate is a valuable safety net.
  • You live in a high-tax state where the tax-equivalent yield makes the bond competitive with bank CDs.

You should skip I-Bonds now if:

  • You need the money for a down payment in 6 to 12 months.
  • You prioritize maximum current yield over inflation protection.
  • You have not yet maxed out tax-advantaged accounts like 401(k)s or IRAs.

Frequently Asked Questions

How much can I buy? You are limited to purchasing $10,000 in electronic I-Bonds per calendar year per Social Security Number. You can purchase an additional $5,000 using your federal tax refund, bringing the total theoretical limit to $15,000.

Where do I buy I-Bonds? You can only buy electronic I-Bonds directly from the U.S. government through the TreasuryDirect website. You cannot buy them through a brokerage like Fidelity, Vanguard, or Schwab.

Do I lose money if the rate goes down? No. The combined rate for an I-Bond can never go below zero. Even if we hit a period of deflation (negative inflation), the redemption value of your bond will simply remain the same; it will not decrease.

Is the interest compounded? Yes. Interest is earned monthly and compounded semiannually. This means every six months, the interest you earned is added to the principal value of the bond, and future interest is calculated on that new, higher amount.