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Inflation Report Breakdown: Latest CPI and PCE Numbers Explained

Inflation Report Breakdown: Latest CPI and PCE Numbers Explained

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Inflation Report Breakdown: Latest CPI and PCE Numbers Explained

October 8, 2026 | ATN Trade & Finance

Two inflation reports have landed since the last Fed meeting, and they are telling somewhat different stories depending on which measure you look at — and how carefully you read the methodology footnotes.

August CPI (Released September 11): Energy Is the Whole Story

The August Consumer Price Index came in at +3.4% year-over-year (+0.4% month-over-month), unchanged from July's pace. Strip out food and energy, and the picture is substantially more benign: core CPI was +2.4% YoY (+0.3% MoM), its slowest annual pace since March 2021.

The gap between the headline and core rates is almost entirely explained by energy. Energy rose +16.3% year-over-year, with gasoline up +27.4% YoY and +3.9% in August alone as the Iran conflict and Hormuz disruptions pushed pump prices to record seasonal highs. Airline fares followed suit at +23.4% YoY — a direct energy pass-through. Outside the energy complex, the picture was quiet: food rose only +2.7% YoY (+0.1% MoM), shelter eased to +3.0% YoY (+0.3% MoM), and motor vehicle insurance actually fell -5.1% YoY after years of outsized increases. Services ex-energy, the Fed's most-watched underlying indicator, rose +3.0% YoY.

August PCE (Released September 30): Cooler — But Read the Footnotes

The Fed's preferred gauge, the Personal Consumption Expenditures price index, came in notably below expectations when the Bureau of Economic Analysis released it on September 30. Headline PCE was +3.4% YoY (+0.3% MoM), against a forecast of 3.7%. Core PCE was +3.0% YoY (+0.2% MoM) — a significant miss versus the consensus 3.3%, and down from 3.3% in July.

There is an important asterisk. The BEA's annual methodology revision — changing how it measures prices for portfolio management fees, software, and legal services — cut roughly 0.18 to 0.2 percentage points from the core PCE reading. RBC and the Wichita Liberty analysis both describe this as a measurement fix applied retroactively, not evidence that prices actually fell. On the old methodology, July's core PCE would have read 3.3% rather than the revised 3.0%, and August's "beat" against consensus largely reflects forecasters who had not yet incorporated the revision.

That caveat aside, the monthly core reading of +0.2% MoM was still softer than expected even on the new basis. Personal spending rose +0.9% MoM (real: +0.6%), and the personal saving rate ticked up to 4.1%. New York Fed President John Williams cited the data in saying there is "no need for urgency" on an October hike, though he still sees one more hike "late this year." Markets moved swiftly: the probability of an October hike fell from roughly 70% to 35% on the day of the report.

What Comes Next: September CPI Due October 14

The next CPI release, covering September, is scheduled for October 14 — six days away. Forecasters expect the headline to jump back to 3.7% YoY (+0.6% MoM), driven by a roughly 5.5% surge in gasoline prices as September pump prices hit their highest level since the early spring shock. Core CPI is expected to ease slightly on a monthly basis to +0.2% MoM, holding the annual rate near 2.4% YoY. The Cleveland Fed's nowcast puts headline at 3.60% and core at 2.39%. If those numbers hold, October 14 will deepen the narrative of energy-driven headline inflation running well above a core that is already approaching the Fed's zone — while making December the live rate decision rather than October 27-28.

What this means for businesses and borrowers: The August data combination — CPI headline at 3.4% driven by energy, core PCE at 3.0% after a methodology revision that flattered the number — gives the Fed cover to pause in October without abandoning its tightening posture. The problem is that the energy component is not a Fed problem: it is a Hormuz problem. Until the strait reopens or demand destruction sets in, headline inflation will remain elevated, complicating the Fed's communication even as underlying services inflation edges lower. For businesses with fuel cost exposure, the October 14 print is the next concrete data point to watch.

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