The number is out. August CPI came in at +0.4% month over month, holding the annual rate at 3.4%, exactly in line with the Dow Jones consensus. That part of the report gave markets nothing new. The problem was underneath it. Core CPI, which strips out food and energy, printed at 0.3% for the month, a full tenth above the 0.2% forecast. Shelter re-accelerated from 0.1% to 0.3%. Gasoline jumped 3.9% and accounted for more than a third of the headline gain. The Fed votes on September 16. Warsh now has less cover to hold than he did at 8:29 a.m.

Bullet Summary

• Headline CPI: +0.4% m/m, +3.4% y/y. Both matched consensus.
• Core CPI: +0.3% m/m, above the 0.2% forecast. Annual core eased to 2.4%.
• Shelter re-accelerated to +0.3% m/m after two months of moderation at 0.1%.
• Energy index rose 2.1% on the month, up 16.3% year over year. Gasoline alone: +3.9%.
• Transportation services climbed 0.5%. Used cars and trucks up 0.4%. New vehicles up 0.3%.
• Pre-release, markets were pricing roughly 70% odds of a September hike. That figure is moving higher.
• The Fed funds rate sits at 3.50%–3.75%, unchanged all year. The FOMC votes in five days.

Market Context

Coming into today’s print, the macro setup was already tilted hawkish. The July FOMC vote was 9-3, with three members already wanting a hike that meeting. Jackson Hole shifted expectations sharply: Warsh’s remarks pushed markets from pricing little chance of a September move to a better-than-even probability within hours. Then August payrolls printed 162,000 jobs added with unemployment holding at 4.1%, well above expectations, removing any labor market excuse for a hold. The 10-year Treasury yield has been pressing the 4.95% area this week. TLT has been trading near $81–82, levels not seen since 2004.

Thursday’s PPI added to the pressure: wholesale inflation came in at +0.4% m/m, with the 12-month reading hitting 5.4%, the highest of 2026. Diesel fuel surged 24.1% over the past year. The pipeline was clearly building. Today’s CPI confirmed the pressure has not dissipated at the consumer level. Kathy Bostjancic, chief economist at Nationwide, was direct: Warsh and others had signaled rates could hold only if disinflation continued, and August did not deliver that. Nationwide now expects a quarter-point hike next week.

What the Numbers Actually Show

The annual core rate easing from 2.5% to 2.4% looks like progress on paper. The monthly trajectory tells a less comfortable story. Core CPI ran at 0.0% in June, 0.2% in July, and 0.3% in August. That is three consecutive months of re-acceleration in the monthly run-rate, which annualizes to something well above the Fed’s 2% target. Shelter, which had moderated sharply in July, came back at 0.3%. Services excluding energy also rose 0.3%. Airline fares jumped 2.7% and lodging away from home rose 2.4%. The breadth of the monthly gains is the detail that matters most for policymakers who have been on hold all year despite a divided committee.

Energy’s role is worth isolating. Gasoline at +3.9% and a broad energy index up 2.1% inflated the headline reading. Traders who focus only on core will note the annual rate is still declining. The committee members who wanted to hike in July will focus on the monthly acceleration and the shelter reversal. Both camps now have data to argue from, which is exactly why the September 16 vote is not a foregone conclusion even with hike odds well above 60%.

Scenario Modeling

Bull Case: The FOMC reads the annual core decline from 2.5% to 2.4% as evidence that disinflation is intact, treats the monthly re-acceleration as transitory energy pass-through, and votes to hold at 3.50%–3.75%. Front-end yields pull back as markets unwind hike pricing. TLT recovers toward $84–85. The S&P, recently trading in the 7,600s, reclaims the 7,650–7,700 area. This outcome requires Warsh to publicly frame the hold as data-conditional rather than policy retreat.

Base Case: The committee hikes 25 basis points to 3.75%–4.00% on September 16, framing it as a one-time insurance move rather than the start of a tightening campaign. The statement would likely retain optionality language. The 10-year consolidates near 4.90%–5.10%. Equities absorb a modest selloff concentrated in rate-sensitive growth and long-duration names. Dollar holds its bid. This is now the modal outcome given the monthly core beat, shelter re-acceleration, and the existing three-member dissent from July.

Bear Case: The hike comes with hawkish forward guidance rather than a one-and-done signal. Markets price additional tightening. The 10-year breaks 5.00% decisively and holds. TLT tests $79–80. SPY sells toward its 200-day moving average. High-multiple technology names take the sharpest hit as the discount rate re-rates higher. This scenario requires Warsh to explicitly tie future decisions to further inflation data, leaving September as the beginning of a campaign rather than the end of one.

Active Trader Framework

The first 30 minutes of post-release price action is the most informative signal available right now. A TLT bid holding above $82.50 alongside SPY maintaining key support suggests markets are still pricing a hold or a dovish hike. A TLT break toward $80 with the 10-year piercing 5.00% on volume confirms the base case is fully priced and the bear case is being opened. Rate-sensitive sectors, specifically utilities, REITs, and long-duration growth, are the primary expression of whichever scenario markets settle on today.

University of Michigan consumer sentiment follows at 10:00 a.m. ET. A soft reading compounds equity pressure in the hike scenario. A firm reading, combined with today’s hot core print, reinforces the case that the consumer can absorb higher rates, which is precisely the argument the three July dissenters will make next week.

The data has spoken. The committee decides in five days. Know your levels before the vote, not after it.