CPI Preview: Friday’s Inflation Report Could Decide Whether the Fed Hikes Next Week

Friday morning's Consumer Price Index may be the most consequential inflation report of the year. With Treasury yields surging, energy prices elevated and the Federal Reserve increasingly concerned about persistent inflation, the August CPI report could provide the deciding vote on whether Chairman Kevin Warsh's Fed raises rates at its September 15–16 meeting.

The Bureau of Labor Statistics releases CPI at 8:30 a.m. ET Friday. The prevailing consensus calls for headline inflation to rise 0.4% month over month and 3.4% year over year, with core CPI, excluding food and energy, expected to increase 0.2% monthly and 2.4% annually.

Those numbers would ordinarily look reasonably benign underneath the headline. But this isn't an ordinary setup.

The 10-year Treasury yield surged as high as 4.91% Thursday, while Fed funds futures briefly pushed the probability of a September rate hike to approximately 74% following PPI before cooling back toward 67%. With markets essentially pricing a two-in-three chance of tightening, CPI could determine whether the Fed follows through.

Energy Should Drive the Headline

The largest upward force on headline CPI should be energy.

Goldman Sachs expects energy prices to rise roughly 2.3%, contributing to its forecast for a 0.39% headline CPI increase, while Morgan Stanley is slightly hotter at 0.41%. Airfares are another potential pressure point, with Goldman forecasting a roughly 4% increase as higher jet-fuel costs work through the system.

That matters because the energy backdrop has deteriorated further since the August measurement period. Brent crude has moved above $100 amid the continuing Middle East conflict, while food prices face additional geopolitical pressures.

Thursday's PPI report provided a preview. Headline producer prices increased 0.4% in August and 5.4% year over year, with final-demand goods prices jumping 1.1%. More than three-quarters of that goods increase came from energy, which rose 4.2%, including a remarkable 24.1% increase in diesel prices.

PPI wasn't materially hotter than expected, but the bond market's reaction showed that “in line” may no longer be good enough.

Sticky Inflation Is the Bigger Problem

Energy will dominate the headline, but sticky inflation underneath the surface may ultimately determine the Fed's decision.

Shelter remains particularly important because of its large weight in CPI and tendency to adjust slowly. Goldman expects owners' equivalent rent to increase around 0.22% and primary rent around 0.23%, suggesting housing inflation continues to normalize.

Services outside housing deserve even closer attention.

Morgan Stanley expects core services excluding housing to accelerate approximately 0.33%, partly because of higher hotel prices. Airfares, medical services, insurance-related categories and other labor-intensive services will help determine whether underlying inflation is actually converging toward the Fed's target.

Goods inflation is another area to monitor. Earlier tariff effects have complicated the disinflation story, while higher producer costs can eventually migrate into consumer prices.

The problem for the Fed is that inflation doesn't necessarily need to reaccelerate dramatically to justify another hike. It simply needs to remain sticky enough that policymakers lose confidence it is returning to target quickly enough.

The Core Number Could Decide the Fed Meeting

That makes the unrounded monthly core CPI number potentially more important than the headline.

Natixis expects headline CPI of 0.4% but core CPI of just 0.2%, with its precise core estimate at 0.19%. Economist Christopher Hodge argues that something below 0.20% may be necessary to prevent a September hike. If core CPI exceeds that threshold, Natixis believes the Fed will likely raise rates next week.

Other strategists have drawn a similar line.

A core reading that rounds to 0.3% would be particularly problematic because it would suggest the disinflation process isn't progressing rapidly enough. Fed Governor Christopher Waller has indicated that encouraging inflation data could justify allowing disinflation more time, but that he would be prepared to hike if the incoming numbers aren't sufficiently reassuring.

That creates a fairly straightforward framework for Friday.

A genuinely soft core reading around 0.1% or below could materially reduce September hike expectations. Something around 0.2% leaves a debate, particularly depending on the unrounded figure and composition. A 0.3% reading or hotter would make a hike substantially more difficult for the Fed to avoid.

The Bond Market Is Already Delivering Its Verdict

CPI also arrives amid an increasingly uncomfortable Treasury-market backdrop.

Thursday's broadly in-line PPI report failed to calm bonds, with the 10-year yield reaching 4.91%. That followed Treasury Secretary Scott Bessent's announcement Wednesday that Treasury would purchase up to $6 billion of 10- to 20-year securities through its liquidity-support buyback program.

Instead of falling, yields rose.

The intervention was larger than Treasury's previous $2 billion ceiling, but markets had increasingly positioned for something closer to $8 billion–$10 billion. More importantly, investors appear skeptical that Treasury liquidity operations can overcome the larger combination of inflation risk, enormous government borrowing requirements and rising term premiums.

Europe reinforced that message Thursday.

The European Central Bank raised rates by 25 basis points, lifting its deposit rate to 2.50%, and explicitly cited inflation pressures associated with the Middle East conflict. Eurozone inflation reached 3.3% in August, while the ECB said inflation should remain above target for an extended period.

Central banks are confronting the same dilemma: energy inflation is returning before underlying inflation has been completely extinguished.

Could a Fed Hike Actually Lower the 10-Year Yield?

That sets up an unusual possibility.

If CPI is in line or hotter and the 10-year approaches 5%, a Fed hike next week could eventually become bullish for longer-duration Treasuries.

The reason is credibility.

Long-term yields aren't determined solely by expectations for the overnight Fed funds rate. They also contain compensation for expected inflation, fiscal risk and term premium. If investors believe the Fed is reluctant to tighten despite persistent inflation, they can demand greater compensation for owning 10- and 30-year debt.

A 25-basis-point hike could therefore push short-term yields higher while pulling long-term yields lower, particularly if investors interpret the move as restoring confidence in the Fed's commitment to price stability.

That would produce the counterintuitive outcome of a Fed hike potentially becoming the catalyst that finally stops the Treasury selloff.

Friday Is the Decision Point

The setup heading into CPI is unusually binary.

Headline CPI at 0.4% and core around 0.2% would keep a September hike firmly alive. A core reading of 0.3% or hotter would likely strengthen the case considerably. Only a convincingly soft report appears capable of materially shifting expectations back toward a hold.

For equities, the first reaction to a hot CPI would probably be negative as yields and tightening expectations rise. Technology and other long-duration growth stocks remain particularly vulnerable with the 10-year pressing toward 5%.

But investors should also watch the yield curve, not simply the headline level of rates. If hot CPI pushes short rates higher while the 10- and 30-year yields begin falling, the bond market may be signaling that tighter Fed policy is finally restoring credibility.

Thursday's PPI couldn't stop the rise in yields. Bessent's $6 billion Treasury buyback couldn't do it either. The ECB responded to its own inflation problem by hiking rates.

Now CPI gets its turn.

If Friday's inflation report comes in at or above expectations, the Fed may have little choice but to follow—and a September rate hike could ultimately prove to be the medicine the increasingly unruly Treasury market has been demanding.