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Inflation just hit a 3-year peak — the Fed may have to raise rates despite Wall Street concerns

June 26, 2026 · 5 min

David Sterling & Megan Skiendel

The May 2026 PCE inflation report showed headline PCE rising 4.1% year-over-year — a three-year high driven significantly by energy prices tied to the Iran conflict. Core PCE hit 3.4%. CME FedWatch repriced to 64% cumulative probability of a Fed rate hike by September, putting new Fed Chair Kevin Warsh in an immediate credibility bind.

The Federal Reserve's preferred inflation gauge, the Personal Consumption Expenditures (PCE) price index, rose to 4.1% year-over-year in May 2026—its highest level since April 2023 and a three-year high. Core PCE, which strips out volatile food and energy prices, climbed to 3.4% year-over-year, its highest reading since October 2023.

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About this episode

May's PCE inflation report landed at 4.1% year-over-year — the fastest pace since April 2023 and a three-year high for the Fed's preferred price gauge. Core PCE came in at 3.4%. On paper, it looks like a straightforward case for tighter policy. This episode argues it's considerably more complicated than that. The episode digs into why the headline number is probably misleading: energy prices linked to the Iran conflict are doing most of the heavy lifting, and rate hikes can't resolve a geopolitical supply shock. It also examines why the current Fed Funds Rate is, by at least one neutral rate model, still running accommodative — which makes the hawkish market reaction harder to square with the underlying mechanics. There's a sharper story running underneath all of this. New Fed Chair Kevin Warsh is barely 30 days into the job, having announced a facts-only, no-forward-guidance philosophy. The episode traces how that stance, whatever its merits, turns every data release into a high-stakes market event — and how the resulting credibility pressure could push policy in a direction the inflation structure doesn't actually demand. South Korea's KOSPI triggering two circuit breakers in a single month adds a real-world cost to the abstraction: capital is already moving before a single rate is touched.

Frequently asked

What did the May 2026 PCE inflation report show?

The May 2026 PCE report showed headline inflation at 4.1% year-over-year, a three-year high and the fastest pace since April 2023, according to Bureau of Economic Analysis data. Core PCE, which excludes food and energy, came in at 3.4%. Energy prices tied to the Iran conflict drove a significant portion of the headline increase.

Will the Fed raise interest rates in 2026 after the May PCE report?

After the May 2026 PCE report showed 4.1% inflation, CME FedWatch repriced to roughly 64% cumulative probability of a Fed rate hike by September 2026. Markets still showed 65%-plus probability of holding in July, meaning traders are pricing September optionality rather than an imminent move.

Why does the Fed use PCE instead of CPI to measure inflation?

The Federal Reserve formally adopted the PCE index as its preferred inflation gauge in 2012 because PCE adjusts for consumer substitution behavior — when prices rise, it reflects that shoppers swap to cheaper alternatives. CPI uses a fixed basket. This makes PCE a more dynamic measure of actual spending patterns.

Who is Kevin Warsh and why is he under pressure over inflation?

Kevin Warsh became Federal Reserve chair roughly 30 days before the May 2026 PCE report was released. He adopted a 'facts-only, no forward guidance' communication stance at the outset, which means every major data release now directly drives market rate expectations — leaving him with little room to manage expectations without a track record to draw on.

Can the Fed fix inflation caused by an oil supply shock?

The May 2026 PCE spike to 4.1% was driven significantly by energy prices tied to the Iran conflict — a geopolitical supply shock. Rate hikes cannot increase oil supply, so monetary tightening is a poor tool for this specific inflation source. If energy prices peak on their own, the headline PCE number could fall regardless of Fed action.

Grounded in 12 sources
Inflation jumps again with gas prices running higher than in past years | AP News · apnews.com
The Warsh Fed could usher in an era of market yips - Axios · axios.com
Fed Faces Rising Rate Hike Expectations, Schwab Center's Martin Says - Bloomberg · bloomberg.com
Citadel Says Fed’s New Regime Could Stabilize Treasury Long End - Bloomberg.com · bloomberg.com
The Fed's preferred inflation gauge shows prices rising at fastest pace in 3 years - CBS News · cbsnews.com
The Fed's preferred inflation gauge shows prices rising at fastest pace ... · cbsnews.com
PCE inflation report May 2026: - CNBC · cnbc.com
Dollar rides high on Fed rate-hike bets - CNBC · cnbc.com
The Fed's Warsh era clearly has a new vibe — and that's not all bad for investors - Yahoo Finance · finance.yahoo.com
PCE report: Fed's preferred inflation measure hits 3-year high, keeping talk of possible rate hike in play - Yahoo Finance · finance.yahoo.com
Key inflation gauge jumps to 3-year high in latest sign of affordability challenges | PBS News · pbs.org
Inflation hits 3-year high, pressuring Fed to raise rates as election nears - Politico · politico.com
Read transcript

David Sterling: The May PCE report is out. Four point one percent year-over-year.

Megan Skiendel: Three-year high.

David Sterling: Fastest since April 2023. Core PCE, 3.4. And here's the point — I want your read before I give mine.

Megan Skiendel: Honestly? My read is that Kevin Warsh is already cornered and he's been chair for thirty days. Here's what happened — he debuts May 22nd, announces this facts-only, no forward guidance stance, which I actually think is a coherent philosophy. But the immediate consequence of abandoning forward guidance is you make every data release a trigger. So when the BEA drops 4.1% PCE, CME FedWatch immediately reprices to 64% cumulative probability of a hike by September. Warsh didn't set that expectation. The data did. Which is technically what he asked for — and that is the trap.

David Sterling: So your claim is the trap is self-inflicted.

Megan Skiendel: Completely self-inflicted. He built the mechanism himself.

David Sterling: Well, here's what I want to pump the brakes on. The mechanism is self-inflicted, fine. But the actual policy stance — the math — is dovish. As of June 24th, TMC Research, James Picerno's neutral rate model, has the effective Fed Funds Rate sitting roughly 40 basis points *below* neutral. Below. That's not hawkish. That's accommodative on the mechanics.

Megan Skiendel: Wait — below neutral while he's talking like he might hike?

David Sterling: Correct. And then layer on the inflation source. The May PCE spike — 4.1%, driven significantly by energy prices tied to the Iran conflict. Rate hikes don't drill oil wells. They don't resolve a geopolitical supply shock. The tool doesn't fit the problem.

Megan Skiendel: Megan Skiendel: The shopping cart — I mean, PCE adjusts when prices rise, right? It's not a fixed list like CPI. So it's actually catching substitution behavior. Which means the 4.1% is the *honest* number, and the honest number is still being distorted by Iran.

David Sterling: That's exactly it. PCE is the shopping cart that swaps cheaper items automatically — that's why the Fed formally adopted it in 2012. More honest than CPI. And the honest read says: energy is doing the heavy lifting. Core PCE, 3.4%. Still elevated, but the breadth story is less alarming than the headline.

Megan Skiendel: And CME FedWatch shows 65-plus percent probability of *holding* in July. So markets aren't even pricing an imminent move — just September optionality. Which means Warsh is fighting a rhetorical war against an inflation print the FOMC literally cannot fix.

Megan Skiendel: But here's where I think the hot take actually holds — June 23rd. KOSPI triggers its second circuit breaker of the month. Second. In June alone. That's not US sentiment bleeding overseas. That's EM carry trade managers hitting the exit because they're repricing refinancing risk in real time.

David Sterling: The KOSPI breaks. I'll admit that genuinely surprised me.

Megan Skiendel: It should. Because that's not noise — that's capital preservation kicking in. When South Korea breaks, the carry trade unwind is already happening. The tightening consequences are live before Warsh touches a single rate.

David Sterling: I want to push on the false-alarm objection, though, because — look, bond futures priced hikes in 2015, 2018, neither materialized. But actually... a new chair's first 90 days is categorically different. Warsh's credibility isn't established yet. He has no track record to borrow against. So the market isn't crying wolf — it's testing whether the philosophy survives contact with a 4.1% print.

Megan Skiendel: And Politico lands the election-cycle piece right on top of that. Three-year-high inflation, Trump wanting cheap money — that friction doesn't reduce Warsh's incentive to hike. It increases it. If he folds, he's Powell's shadow forever.

David Sterling: That's the credibility trap closing. The communication vacuum he built — the facts-only stance — markets fill silence with worst-case. The Hill flagged June 25th that the breadth of May price increases beyond energy actually alarmed economists. So even stripping Iran, the core structure gives him political cover to move.

David Sterling: Fine. The credibility trap is real. I'll grant you that. But what that actually means — wait, let me back up — what that means structurally is that Warsh may be about to fight a geopolitical fire with a monetary hose. The Bureau of Economic Analysis prints a number, Warsh has to respond to it. That's the mechanics. That's the box he's in.

Megan Skiendel: And energy prices have probably peaked. So the 4.1 likely comes down on its own.

David Sterling: Probably, yes. Which is the sharp edge of this. If he hikes in September primarily to prove he's not Trump's Fed — not because the inflation structure actually demands it — the inflation number likely falls anyway. But you've still got a rate hike landing into a supply shock, with KOSPI already breaking circuit breakers and EM credit conditions tightening. History won't remember the independence. It'll remember what broke.

Inflation just hit a 3-year peak — the Fed may have to raise rates despite Wall Street concerns · Onpode