By David Enna, Tipswatch.com
While the news was expected, the May inflation report issued today by the Bureau of Labor Statistics is disturbing: U.S. all-items inflation rose 0.5% for the month on a seasonally-adjusted basis, rising to an annual rate of 4.2%, the highest since April 2023.
Core inflation, which strips out food and energy, was a bit tamer with a rise of 0.2% for the month and 2.9% for the year, up from 2.8% in April. The monthly core rate was below expectations — the one sliver of good news this morning.
In just over three months since the beginning of the Iran conflict, U.S. annual inflation has increased from 2.4% in February to 4.2% in May. The rate of increase may ease going forward, but U.S. inflation is likely to linger above 4.0% for many months.
The BLS noted that the energy index rose 3.9% in May, accounting for about 60% of the increase in all-items inflation. Gasoline prices were up 7.0% in May and are now up 40.5% over the last 12 months. Also from the report:
- Food at home prices rose a moderate 0.1% for the month and are now up 2.7% for the year. These costs could rise as higher transportation costs are passed through.
- Beef prices fell 1.6% for the month, but are up 12.9% for the year.
- Egg prices rose a surprising 4.0% for the month but are down 35.2% for the year.
- Shelter costs rose 0.3% for the month and 3.4% for the year.
- Apparel prices rose 0.3% for the month and 4.8% for the year.
- Airline fares rose 2.7% for the month and are now up 26.7% for the year.
- Costs for new vehicles fell 0.3% in May and are up only 0.2% for the year.
- Prices for used vehicles rose 0.1% for the month and were down 0.2% for the year.
The report shows the huge effect gasoline prices are having on U.S. inflation, which could be causing some deflationary pressures for other categories as consumers deal with higher commuting costs. The gas-price effect could ease if the conflict with Iran is resolved, but benefits could be many months away.
Meanwhile, inflation expectations will be rising, a dangerous trend. Here is the 12-month trend for all-items and core inflation, showing the burst higher since the war began on Feb. 28. Notice, however, that core inflation continues to inch higher even without the effect of higher gas prices.
What this means for TIPS and I Bonds
Investors in Treasury Inflation-Protected Securities and Series I Savings Bonds are also interested in non-seasonally-adjusted inflation, which is used to adjust principal balances on TIPS and set future interest rates for I Bonds.
The BLS set May’s CPI index at 335.123, an increase of 0.63% for the month, following an increase of 0.85% in April. These increases are higher than “headline” inflation because of the effects of seasonal adjustments. Later in the year, this trend will reverse.
For TIPS. The May report means principal balances for all TIPS will increase 0.63% in July, after rising 0.85% in June. Over the last year, principal balances will have increased 4.2% at the end of July. Here are the new July Inflation Indexes for all TIPS.
For I Bonds. The May report was the second of a six-month string that will determine the I Bond’s new variable rate, to be reset November 1 based on inflation for the months of April to September. So far, after just two months, inflation has increased 1.49%, which translates to a variable rate of 2.98%. But there are four months left to go. Prediction: I Bonds are going to get very popular later this year.
What this means for future interest rates
Here is a key point: The U.S. inflation rate at 4.2% is now well above the effective Federal Funds rate of 3.61%. This can’t be tolerated for long. So either inflation needs to start trending lower, or the Federal Reserve will have to signal the possibility of higher rates.
This is complex. Gas prices could be causing a “transitory” spike, and actually causing some deflation in other economic areas. It will take time to see the end result.
The Fed’s Open Market Committee will meet next week under the leadership of new Chairman Kevin Warsh. Prediction: the Fed will stand pat on rates, but will need to signal that rate increases are under consideration. Warsh will be walking a tightrope.
On the positive side, core inflation has not yet surged higher. That would be a dangerous trend. From Bloomberg Economics this morning:
Overall, the CPI report sent a clear signal that consumers are pulling back on nonessential spending, pushing back against business attempt at price hikes. This should ease fears of Fed rate hikes following the blowout May payrolls report. We still expect policymakers to cut rates by 25 basis points in the fourth quarter of the year.
This is from Olu Sonola, head of U.S. economics at Fitch Ratings:
Headline inflation is hot — and getting hotter — an unwelcome handoff as the new Fed Chair takes the wheel. But this is not yet a panic-hike story. Core inflation remains relatively contained, giving the Fed room to stay on hold for a while longer. The burden now falls on the next few core readings and inflation-expectations data: if they stay contained, the Fed can look through the headline heat; if they crack, the rate-hike debate moves front and center.
From Seema Shah, chief global strategist for Principal Asset Management:
Inflation remains uncomfortably high at 4%, but the softer-than-expected core reading takes some of the pressure off. With energy driving much of the increase and shelter easing, we’re not yet seeing clear sign of broader second-round effects. This should allow the Fed to remain patient.
From this analysis, and because of the political pressures involved, I think we won’t see any change in the federal funds rate for several months. Longer-term interest rates could continue rising, however.
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Treasury Inflation-Protected Securities 
So what does this mean for the 10 year TIPS auction next month? I’m building out my ladder now with $5000 purchases in both January and July. I already have rungs 2046-55 in place, so now I’m filling in the earlier years.
At this point, the 10-year auction is looking good, with an estimated yield of 2.20%, per the Treasury. Things can change in a month, of course.
Iran conflict —> *Iran War
We still expect policymakers to cut rates by 25 basis points in the fourth quarter of the year. —> On what basis is Bloomberg asserting this expectation? The data doesn’t seem to support it.
So far, after just two months, inflation has increased 1.49%, which translates to a variable rate of 2.98%. But there are four months left to go. Prediction: I Bonds are going to get very popular later this year. —> That’s a safe prediction. With four months to go, we are looking at a historically high variable rate for the I Bond (perhaps not as high as it hit in 2022 but very high). Everyone holding I Bonds will benefit, and if you own an EV or commute by train or drive only locally, you aren’t absorbing the brunt of the inflatiom (although the price of oil does affect many other sectors). It’s hard to believe the fixed rate will only increase by a modest 0.1% given the overall situation. One benefit of the timing is that if the next reset is a high point, those interested in buying I Bonds who have held off in 2026 so far can buy the next reset twice, once at the end of 2026 and again at the beginning of 2027. That is my plan.
Thank you for your focus on … words. I too was intrigued by the semantic downgrade from “War” to “Conflict”. And don’t get me started on the reemergence of “transitory”, lol. Let the mockery begin – oh, wait, I guess it’s different when it’s a self-induced phenomenon of choice? Whatever the framing, you can’t trust BLS statistics anyway: our current POTUS has repeatedly told us so.
Marce & MLS, I appreciate the feedback on the word “conflict.” At this point, we are in a tense ceasefire with a couple of shooting incidents a week. Israel and Lebanon? Worse. In past posts I have used “war” more than conflict, even in a headline. But right now this leans more toward conflict than war. In a day or a week or a month, it could be a war.
Okay, fine. I thought it was worth noting. But what about Bloomberg still predicting a rate cut later in the year. Based on what data?
Im not a wait and see person, I found I missed the move or worse left holding the bag. https://markets.financialcontent.com/wral/article/marketminute-2025-12-10-federal-reserve-unveils-t-bill-buying-spree-signals-new-era-for-market-liquidity Next year Stable Coin has to be backed the treasuries more demand lower rates. Of course Inflation will go through the roof. Long term is different, global is dumping our bonds and demand will be lower demanding higher rates. Doesn’t matter the fixed rate on IBonds your gonna clean up on the inflation kicker. Yes I’ll eventually need to make a decision or not to move my money market funds to something that might track inflation, like those TIP funds. Of course a higher fixed rate ibond cushions the blow if wrong. Also the outcome of the IRAN war could signal the end of the Petro Dollar. Stable Coin back by YUAN Id definitely take a look at.
5-Year TIPS real yields are hovering around a 1.8%, which would mean a 1.2% fixed rate in November if this holds. Would you care to speculate on the direction of the next fixed rate?
I agree that the fixed rate looks likely to rise to at least 1.0%, and could be higher. The key question is how long these elevated real yields will continue. Way too early to say.
David – I don’t mean to put you on the spot, but if someone hasn’t purchased their 2026 I Bond allotment yet, would it make sense to wait at this point?
Yes, it definitely makes sense to wait at least until mid-October.