The Bureau of Labor Statistics will publish its September Consumer Price Index on Wednesday 14 October at 8:30 a.m. Eastern, the agency said in its August release. A street consensus compiled for a preview by the broker Admirals puts headline inflation at about 3.7 per cent over 12 months, up from 3.4 per cent in August, with core expectations clustered around 2.4 per cent.
The headline number will draw the attention. The gap underneath it is the story. If those forecasts are right, prices excluding food and energy will be rising more than a point more slowly than prices overall. That points to petrol.
What the forecasters expect
The Cleveland Fed's nowcast, updated on 9 October, puts September CPI up 0.53 per cent on the month and 3.60 per cent on the year, with core up 0.20 per cent on the month and 2.39 per cent on the year.
RBC Economics is a little higher. It forecasts headline CPI up 0.6 per cent on the month and 3.7 per cent on the year, and core up 0.2 per cent on the month, a figure it describes as rounding down, and 2.5 per cent on the year. RBC said headline inflation "remains an oil price story." It also noted that "supercore" inflation, which strips shelter out of core services, "has consistently printed at or above 3% since March and has begun to reaccelerate."
The spread is narrow: 3.6 to 3.7 per cent on headline and 2.4 to 2.5 per cent on core. That is our reading of the forecasts, not a statement from any of them: a surprise is more likely to come from core, where RBC is already leaning on rounding, than from headline.
Where the gap comes from
The BLS August report showed all items up 0.4 per cent on the month and 3.4 per cent on the year. Core rose 0.3 per cent on the month and 2.4 per cent on the year. The gasoline index rose 3.9 per cent in August and accounted for over one third of the monthly increase in the all-items index, and the energy index was up 16.3 per cent over 12 months, the BLS said.
By this publication's arithmetic, headline minus core was 1.0 point in August. On the street consensus it would be 1.3 points in September. On the Cleveland Fed's figures it would be about 1.2.
September made the petrol problem worse. Admirals attributes most of the expected jump to record September petrol prices. Energy Information Administration data, as published by FRED, bear that out in nominal terms: by this publication's arithmetic, regular petrol averaged about $4.36 a gallon across the four weekly September readings, against $4.06 in August and $3.17 in September 2025. That is the highest September average in the series, which begins in 1990. Crude is the reason. The EIA's spot price for West Texas Intermediate was $96.24 a barrel on 6 October, according to FRED, against $62.49 a year earlier.
What it means for budgets
Gasoline, heating and electricity are bills most households cannot defer. A household that spent $250 a month on energy a year ago and faced the 16.3 per cent annual rise in the energy index would pay about $41 more a month. That is an illustration, not a BLS figure, and actual bills depend on driving, climate and local utility rates.
That is why a calm core reading offers limited comfort. Core inflation strips out the items that have risen fastest. It is a better guide to underlying price momentum than to what a family's bank balance feels. The Fed's own gauge is also less calm than core CPI. Bureau of Economic Analysis data published by FRED show core personal consumption expenditures prices up 3.0 per cent over the 12 months to August, and headline PCE up 3.4 per cent. The Fed's 2 per cent target is set in PCE terms.
What happens next
The report arrives two weeks before the Fed's next decision. The Federal Open Market Committee meets on 27 and 28 October, according to the Fed's calendar. It raised rates to 3.75 to 4 per cent in September, and the minutes of that meeting showed most officials expect another increase by year end, as this publication reported. Admirals, citing the CME FedWatch tool in early October, put the market-implied chance of an October hike at about 20 per cent and of at least one hike by December at about 81 per cent. Those are one week's market prices, not a forecast from the Fed.
The bond market is not waiting. The 10-year Treasury yield closed at 5.24 per cent on Friday 9 October, according to Treasury data.
The test is narrow. If core comes in at 0.2 per cent on the month, the argument that petrol alone is lifting inflation holds, and the Fed has room to wait until December. If it comes in at 0.3 per cent or more, or supercore keeps climbing, the energy explanation stops being enough. Either way, the gap between headline and core will tell households and the Fed which kind of inflation they are dealing with.
The 14 October release date and time, and all August CPI figures (all items 0.4 per cent monthly and 3.4 per cent annual, core 0.3 and 2.4 per cent, gasoline up 3.9 per cent and over one third of the monthly increase, energy up 2.1 per cent monthly and 16.3 per cent annual), come from the BLS CPI release of 11 September 2026. The nowcast figures are from the Cleveland Fed's inflation nowcasting page, updated 9 October 2026. The street consensus of about 3.7 per cent, the claim about record September petrol prices and the CME FedWatch odds are from an Admirals preview dated 8 October 2026. RBC's forecasts and quotations are from RBC Economics' U.S. Week Ahead of 9 October 2026. Weekly regular gasoline prices and WTI spot prices are Energy Information Administration data as published by FRED; August PCE and core PCE inflation are Bureau of Economic Analysis data as published by FRED. The 27-28 October meeting date is from the Federal Reserve's calendar; the 10-year yield is from the Treasury's daily yield curve. The monthly petrol averages, the year-on-year comparisons, the headline-core gaps and the $41 household illustration are this publication's arithmetic. The analysis is our own.
Topics moneyinflationFederal Reserveenergy pricesgasoline
