May 2023 fixed rate will be 0.90%, total composite rate is 4.30% for next 6 months. For Savings I bonds bought from May 1, 2023 through October 31, 2023, the fixed rate will be 0.90% and the total composite rate will be 4.30%. The semi-annual inflation rate is 1.69% as predicted (3.38% annually), but the full composite rate is dependent on the fixed rate for each specific savings bond and so it is a little bit higher.

Every single I bond will earn this inflation rate of ~3.40% eventually for 6 months, depending on the initial purchase month. The fixed rate was higher than I predicted, although still a bit lower than short-term TIPS yields. You may wish to wait until October if you don’t like what you see right now. See you again in mid-October for the next early prediction for November 2022.

Original post from 4/12/23:

Savings I Bonds are a unique, low-risk investment backed by the US Treasury that pay out a variable interest rate linked to inflation. With a holding period from 12 months to 30 years, you could own them as an alternative to bank certificates of deposit (they are liquid after 12 months) or bonds in your portfolio.

New inflation numbers were just announced at, which allows us to make an early prediction of the May 2023 savings bond rates a couple of weeks before the official announcement on the 1st. This also allows the opportunity to know exactly what a April 2023 savings bond purchase will yield over the next 12 months, instead of just 6 months. You can then compare this against a May 2023 purchase.

New inflation rate prediction. September 2022 CPI-U was 296.808. March 2023 CPI-U was 301.836, for a semi-annual increase of 1.69%. Using the official formula, the variable component of interest rate for the next 6 month cycle will be ~3.38%. You add the fixed and variable rates to get the total interest rate. The fixed rate hasn’t been above 0.50% in over a decade, but if you have an older savings bond, your fixed rate may be up to 3.60%.

Tips on purchase and redemption. You can’t redeem until after 12 months of ownership, and any redemptions within 5 years incur an interest penalty of the last 3 months of interest. A simple “trick” with I-Bonds is that if you buy at the end of the month, you’ll still get all the interest for the entire month – same as if you bought it in the beginning of the month. It’s best to give yourself a few business days of buffer time. If you miss the cutoff, your effective purchase date will be bumped into the next month.

Buying in April 2023. If you buy before the end of April, the fixed rate portion of I-Bonds will be 0.40%. You will be guaranteed a total interest rate of 0.40 + 6.49 = 6.89% for the next 6 months. For the 6 months after that, the total rate will be 0.40 + 3.39 = 3.79%.

Let’s look at a worst-case scenario, where you hold for the minimum of one year and pay the 3-month interest penalty. If you theoretically buy on April 30th, 2023 and sell on April 1st, 2024, I estimate that you’ll earn a ~4.48% annualized return for an 11-month holding period, for which the interest is also exempt from state income taxes. If you theoretically buy on April 30th, 2023 and sell on July 1, 2024, you’ll earn a ~5.07% annualized return for an 14-month holding period. Comparing with the best interest rates as of April 2023, these short-term rates are roughly on par on what is available via regular nominal Treasury bonds and other deposit accounts.

Buying in May 2023. If you buy in May 2023, you will get 3.38% plus a newly-set fixed rate for the first 6 months. The new fixed rate is officially unknown, but is loosely linked to the real yield of short-term TIPS. My rough guess is somewhere between 0.2% and 0.5%. The current real yield on short-term TIPS is lower than it was during the last reset, when the fixed rate was set at 0.4%. Every six months after your purchase, your rate will adjust to your fixed rate (set at purchase) plus a variable rate based on inflation.

If you have an existing I-Bond, the rates reset every 6 months depending on your purchase month. Your bond rate = your specific fixed rate (based on purchase month, look it up here) + variable rate (total bond rate has a minimum floor of 0%). So if your fixed rate was 1%, you’ll be earning a 1.00 + 3.38 = 4.38% rate for six months.

Buy now or wait? If you buy in April, you will get the remnants of the last period of higher inflation, and a fixed rate that won’t change much for May. If you wait until May, there may be a small possibility that the fixed rate might go up, but even if it does, it will take a while for that to breakeven due to the lower initial inflation rate. Therefore, my opinion is that I would purchase now in April. Note that the real yields on TIPS are currently about 1.2% for a 5-year term, higher than the fixed rate for I bonds.

Unique features. I have a separate post on reasons to own Series I Savings Bonds, including inflation protection, tax deferral, exemption from state income taxes, and educational tax benefits.

Over the years, I have accumulated a nice pile of I-Bonds and consider it part of the inflation-linked bond allocation inside my long-term investment portfolio.

Annual purchase limits. The annual purchase limit is now $10,000 in online I-bonds per Social Security Number. For a couple, that’s $20,000 per year. You can only buy online at, after making sure you’re okay with their security protocols and user-friendliness. You can also buy an additional $5,000 in paper I bonds using your tax refund with IRS Form 8888. If you have children, you may be able to buy additional savings bonds by using a minor’s Social Security Number. TheFinanceBuff has a nice post on gifting options if you are a couple and want to frontload your purchases now. TreasuryDirect also allows trust accounts to purchase savings bonds.

Note: Opening a TreasuryDirect account can sometimes be a hassle as they may ask for a medallion signature guarantee which requires a visit to a physical bank or credit union and snail mail. This doesn’t apply to everyone and seems to have gotten better recently, but the takeaway is don’t wait until the last minute.

Bottom line. Savings I bonds are a unique, low-risk investment that are linked to inflation and only available to individual investors. You can only purchase them online at, with the exception of paper bonds via tax refund. For more background, see the rest of my posts on savings bonds.

[Image: 1950 Savings Bond poster from US Treasury – source]

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Savings I Bonds May 2023 Inflation Rate: 0.90% Fixed, 4.30% Total Composite Rates from My Money Blog.

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