U.S. September CPI Beats Expectations, Fed October Rate Hike Probability Rises to 50%, Treasuries Fall as Dollar Hits Year-High
nashnova research
U.S. September CPI rose 3.7% year-on-year and core CPI hit 2.6%, both above forecasts — the first year-on-year reacceleration since May. Markets repriced October rate-hike odds from 22% to roughly 50%, Treasuries sold off across the curve, and the dollar hit a 2025 high, as the inflation print reshapes the rate path and asset prices.
How much did inflation overshoot?
September headline CPI came in at 3.7% year-on-year, above the 3.6% consensus and August's 3.4%. Month-on-month it rose 0.6% — the largest single-month gain in five months.
Core CPI — stripping out food and energy — rose 0.3% month-on-month, topping the 0.2% forecast; year-on-year it hit 2.6%, the highest since June.
This means → both headline and core beat expectations. This is the first year-on-year reacceleration since May, breaking the "inflation is cooling" narrative.
How did rate-hike odds jump to 50%?
Before the data, implied odds for a hike at the Oct 27–28 meeting stood at roughly 22%. Within hours they surged to about 40%, then climbed further to near 50% — a "coin flip," per Bloomberg.
Markets also ramped bets on three more hikes by end-2027, pricing in over 90 basis points of additional tightening.
In plain terms = one inflation print flipped the market from "probably no hike" to "even odds." The prior optimism was fragile.
How did bonds and the dollar react?
The policy-sensitive 2-year Treasury yield jumped 12 basis points to 4.90%. The 10-year rose to 5.318%; the 30-year climbed in tandem. The short end moved most, reflecting repriced near-term hike expectations.
The Bloomberg dollar spot index gained as much as 0.4%, breaking its November high to reach the strongest level since May 2025. Speculative long-dollar positions topped $35 billion — a recent peak.
This means → bonds and the dollar delivered the same message: rates will stay higher for longer, squeezing the window for meaningful rate cuts this year.
What is driving this inflation wave?
The biggest driver was gasoline: up 9.1% month-on-month, far above August's 3.9%. Energy inflation ran at 20.4% year-on-year. The Middle East conflict is widely seen as the trigger; diesel briefly hit an all-time high.
Shelter rose 0.4% month-on-month, up from August. Services excluding energy and rent climbed 0.5% — the most since January. Used-car prices rose 0.7%, the biggest gain since last October.
This reflects something broader than an energy spike — housing, services, and used cars are all rising. Price stickiness is proving stronger than markets assumed. Inflation-adjusted average hourly earnings have now fallen year-on-year for six straight months, squeezing real purchasing power.
What has the government done — and what are the political stakes?
The Trump administration took unconventional steps: temporarily easing tax-exempt diesel restrictions and lifting some sanctions on Russian fuel to boost global diesel supply.
A Reuters/Ipsos poll found roughly 78% of Americans blame rising prices on tariff policy and the U.S.–Israel–Iran conflict. Inflation is feeding directly into the November midterm election narrative.
In plain terms = inflation is no longer just an economic issue — it is becoming a ballot-box issue.
Where does the Fed stand — and what is the October meeting wild card?
Cleveland Fed President Beth Hammack warned that inflation pressure extends well beyond energy — tariffs, AI investment, and services prices all add sustained upward force.
New York Fed President John Williams said one more hike this year is possible, but 2027 may need none. Fed Governor Christopher Waller argued that elevated Treasury yields are already restraining the economy, potentially reducing the urgency for an October hike.
This means → a genuine split inside the Fed on whether to hike. Adding to the uncertainty: the Fed targets PCE inflation, not CPI. The official September PCE reading won't be published until October 30 — two days after the policy meeting ends. Policymakers will decide with incomplete information. Whether upcoming PPI and PCE data confirm this CPI signal is the key checkpoint for October hike expectations.
We had already penciled in an October hike — this print opens the door wider.
Robert Sockin
Chief U.S. Economist, PGIM
(Bloomberg TV interview, post-CPI release)
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