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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 27, 2026 | ATN Trade & Finance

The two most closely watched inflation gauges — the Consumer Price Index and the Personal Consumption Expenditures price index — both moved in the same direction over the past month: up from August, driven by energy, services, and shelter, but diverging in ways that carry real meaning for the Federal Reserve's rate path. The September CPI arrived hotter than expected on October 14; the August PCE, released September 30, came in softer than forecast. September PCE is due tomorrow, Thursday, October 29, at 8:30 a.m. ET — the day after the Fed's rate decision — and is the single number that will most directly shape the December meeting.

September CPI: Energy Drove the Headline, Services Drove the Concern

The Bureau of Labor Statistics reported September CPI on October 14. Headline inflation rose 0.6% month-over-month, the largest monthly gain in five months and up from 0.4% in August, pushing the year-over-year rate to 3.7% — above the 3.6% consensus estimate and up from 3.4% in August. Core CPI, which excludes food and energy, rose 0.3% month-over-month and 2.6% year-over-year, both a tick above expectations and up from 2.4% the prior month.

The headline surge is largely explained by one line: gasoline. Gasoline prices rose 9.1% in September on a monthly basis and are up 34.2% year-over-year. Fuel oil jumped 15.3% for the month and 74.2% year-over-year. Energy overall was up 5.2% for the month and 20.4% over the prior year, accounting for more than half of the monthly headline increase. Electricity (+0.2% MoM) and natural gas (-0.3% MoM) were less dramatic.

The core picture is where the analysis becomes more complicated. Shelter rose 0.4% in September, accelerating from 0.3% in August, with owners' equivalent rent up 0.3% and primary rent up 0.2%. Shelter is now running at 3.2% year-over-year. Services excluding energy rose 0.4% month-over-month and 3.1% year-over-year — a measure closely watched as a proxy for labor market-driven inflation, since services prices tend to track wages more directly than goods. On a three-month annualized basis, core CPI ran at approximately 3.4% to 3.7%, well above the Fed's 2% target.

Food prices offered the one piece of relief: the overall food index was flat in September (unchanged month-over-month), with grocery prices down 0.1% — beef fell 1.0%, dairy 0.9%, and milk 2.0%. Food away from home rose a modest 0.2% for the month but remains up 3.5% year-over-year. Airline fares rose 1.2% in September and are up 22.4% over the past year. Used vehicles rose 0.7% for the month but are still down 1.5% year-over-year, continuing to provide modest offset to goods inflation. The September CPI data also set the 2027 Social Security cost-of-living adjustment at 3.6%, based on CPI-W's 3.9% year-over-year reading.

August PCE: The Fed's Preferred Gauge Came In Softer

The Bureau of Economic Analysis released August 2026 Personal Income and Outlays on September 30. Headline PCE inflation rose 0.3% month-over-month and 3.4% year-over-year — down from 3.7% in July and softer than economists had projected. Core PCE, which the Fed formally targets at 2%, rose 0.2% month-over-month and 3.0% year-over-year. Both readings came in below consensus, and the deceleration from July's 3.7% headline provided a brief cooling of hike expectations after the summer.

Personal spending was notably strong in August: personal consumption expenditures rose $190.8 billion in nominal terms, or 0.9% for the month, with real PCE up 0.6%. Goods spending drove most of that — real spending on goods rose 1.33%, while real services spending rose 0.20%. The strong spending figure alongside softer inflation represents the clearest sign of the consumer resilience that has kept GDP growth positive; Q2 2026 GDP came in at 2.22% annualized growth in its third estimate, with current-dollar GDP at $32.563 trillion. The personal savings rate was 4.1% in August — a level that is not alarming but suggests consumers are drawing down savings at a moderate pace to support spending above income growth. Real disposable personal income per capita rose just 0.05% in August.

September PCE: Due Tomorrow, Markets Watching Closely

September PCE releases Thursday morning. The consensus forecast is core PCE at +0.3% month-over-month and +3.1% year-over-year — a modest acceleration from August's 3.0% core reading. The September CPI's hotter-than-expected services and shelter readings provide the basis for that expectation: PCE and CPI use similar underlying data for many categories, and services inflation has not moderated. Headline PCE is expected to rise on the energy pass-through that drove the CPI headline, though the PCE's different category weighting typically produces a lower headline figure than CPI for the same month.

The timing of the release — one day after the October 28 Fed decision — means it will not influence tomorrow's hold or hike outcome, but it will arrive while markets are still parsing Chair Warsh's press conference language. A September PCE core reading at 3.1% or above would reinforce the case for a December hike; a reading at or below 3.0% would suggest August's deceleration was more than a one-month phenomenon.

How CPI and PCE Differ — and Why Both Matter

The two measures track inflation using different methodologies and weights. CPI measures what consumers actually pay, using a fixed basket of goods and services with shelter making up roughly 35% of the index. PCE uses a broader spending basket, adjusts for substitution as consumers shift away from expensive items, and weights shelter at approximately 15%. Because PCE captures substitution effects and covers a wider range of spending, it tends to run 0.3 to 0.5 percentage points below CPI in most environments. The Fed formally targets 2% PCE inflation, not CPI — which is why the August PCE reading of 3.0% core was more significant to the rate path than CPI's 2.6% core.

The current gap between the two measures is narrower than usual: CPI core ran 2.6% in September while August PCE core was 3.0%. That inversion from the typical pattern — where PCE runs lower — reflects differences in category weights. Services inflation, which is heavier in PCE, has been more persistent than goods inflation, which drives more of CPI's composition.

What this means: The September CPI's 3.7% headline was a reminder that energy prices — themselves linked to geopolitical risk — can move the inflation picture quickly in either direction. The more durable signal is in core services and shelter, both of which are running above the Fed's comfort zone and neither of which shows a clear deceleration trend. August PCE's softer reading provided some relief, but the September PCE out tomorrow will clarify whether that was a turning point or a one-month dip. Core PCE is expected to re-accelerate to 3.1%. At the Fed, the operative question for December is not whether inflation is above target — it clearly is, at 3.0% to 3.4% core depending on the measure — but whether the trajectory is moving toward 2% fast enough to justify a pause. The answer that both measures are giving right now is: not yet.

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