Inflation Hit 3.7% Today and Half of It Was Gasoline. The Fed's Next Hike Just Got Harder to Dodge.
Two days ago we wrote that this morning's inflation report was the one to watch before the Fed meets again. It was, and it went the wrong way.
The Bureau of Labor Statistics said consumer prices rose 0.6% in September, putting the annual rate at 3.7%. Economists surveyed by Dow Jones had expected 3.6%. Core inflation, which strips out food and energy, rose 0.3% in the month and 2.6% over the year, against estimates of 0.2% and 2.5%. Both headline and core accelerated from August, when they were 3.4% and 2.4%.
Inflation has now been above the Fed's 2% target since March 2021. A quarter-point hike at the October 27–28 meeting went from a coin flip to the slight favorite within minutes of the release.
Where the number came from
Energy did most of the damage. The energy index jumped 5.2% in September. Gasoline alone rose 9.1% and accounted for about half of the increase in the whole index. Over the past twelve months gasoline is up 34.2% and fuel oil is up 74.2%.
The cause is not mysterious. The war the U.S. and Israel launched against Iran in late February has crimped oil moving through the Strait of Hormuz and damaged refining capacity in the region. Mark Zandi, chief economist at Moody's, put it bluntly: "The war's fingerprints are all over the report." Michael Reid at RBC called inflation "an oil story" and said it would stay one "for a few more months."
But the report was not only fuel. Shelter rose 0.4%. Used cars and trucks rose 0.7%. Apparel, which is sensitive to tariffs, rose 0.3% and is up 3.4% on the year. Food was flat on the month and up 2.5% annually. Sonu Varghese at Carson Group noted that core inflation ran at a 3.7% annualized pace in September. "The only surprise," he said, "is that investors keep getting surprised by broad-based inflation."
Economists also pointed to two pressures that are not going away: tariffs, and demand for materials and power from the construction of AI data centers.
What the market did with it
Stock futures turned negative and bond yields rose sharply. By CME FedWatch, the odds of a rate hike at the October meeting moved to about 54%. The odds of at least one hike before the end of the year rose above 96%, with roughly even odds that the Fed adds a full half point by December.
This was the last CPI print the Fed will see before it meets. The producer price index comes tomorrow. Wells Fargo Investment Institute wrote on Tuesday that inflation pressures will likely push the Fed to keep hiking into spring 2027, and market pricing now implies at least two more increases next year.
The U.S. is not alone. The IMF's Global Financial Stability Report, published yesterday, counts 14 of 33 major central banks that have raised policy rates since the second quarter, up from two in the first quarter, in response to the energy shock.
Supply shock or something stickier
The textbook says central banks should look through supply shocks. Oil goes up, oil comes down, and raising rates does nothing to reopen a shipping lane.
The Fed is not following the textbook, and in our piece on Monday's Nobel we explained why. After more than five years above target, the Fed's concern is no longer the price of gas. It is whether businesses and households have stopped believing 2% is the goal. Once that belief goes, every supplier builds 3–4% into next year's contract and the shock becomes permanent.
Today's report feeds that fear from both ends. Headline inflation is high enough to shape expectations, and core is firm enough to suggest the energy spike is already leaking into everything else.
The public mood makes the politics worse. The University of Michigan's consumer sentiment index posted its second-lowest reading on record in September. The Social Security Administration announced a 3.6% cost-of-living adjustment for 2027 this morning, and an AARP survey found that three quarters of recipients think a number around that size is not enough. The midterm elections are less than a month away, with affordability the central issue.
What founders should do
Find the fuel in your cost structure. Any business that ships, travels, or runs physical operations has been absorbing a 34% rise in gasoline and a 74% rise in fuel oil. Look at your vendor invoices from the last ninety days, not the last year, and find out who has already passed those costs to you and who is about to.
Reprice before your customers lock their 2027 budgets. Q4 is budget season. A price change that lands in November gets built into next year's plan. The same change in February gets fought line by line. If your contracts run more than a year, this is the moment to add escalators, because your customers' other vendors are doing exactly that.
Build the plan for a 4.5% Fed, not a 3.5% one. Market pricing now has two more hikes in 2027 on top of what comes this year. Anything in your model that depends on cheaper money, from a debt facility to a hiring plan that assumes a recovery, should be re-run at today's rates plus seventy-five basis points.
If you sell to consumers, assume they are stretched. Sentiment near record lows and a 3.6% cost-of-living adjustment that recipients say is too small are not the backdrop for discretionary spending. Subscription products in particular should expect more churn at renewal and should be ready to earn it back with value, not discounts.
Separate the oil story from the demand story in your own numbers. If your costs are rising because of energy, that is a supply problem that may reverse. If your sales are slowing because customers are spending less, that is a demand problem that rate hikes will deepen. They require different responses, and the mistake is treating one as the other.
The honest version
If the war ends and oil falls, headline inflation could drop quickly, and the Fed would get room to stop. That is the optimistic case and it is a real one.
The number that will decide whether the Fed stops at one more hike or several is core, and core moved the wrong way today. Plan for the version where it keeps moving.
Sources
- CNBC, Consumer prices rose 3.7% annually in September as gas prices skyrocket, October 14, 2026
- CNBC, Here's the inflation breakdown for September 2026 — in one chart, October 14, 2026
- International Monetary Fund, Global Financial Stability Report, October 2026: Resilience, Risk, and Transformation, October 13, 2026
- CNBC, Fed officials see another hike coming, but no sign as to when, minutes show, October 7, 2026
