With the Federal Reserve's September rate hike odds sitting at a coin flip, a slight deviation in July CPI from expectations could tip the scales. The market's focus has shifted from whether inflation is falling to whether it can return to the 2% target without further rate hikes. The pivotal moment may come down to a single data point.
July's unexpectedly weak employment data was not enough to fully eliminate the possibility of a near-term rate hike from the Fed. However, if Wednesday's July Consumer Price Index (CPI) report shows a second consecutive month of moderation, it could deliver a decisive blow to rate hike expectations. Consequently, the significance of the July CPI reading has risen sharply: if inflation continues to cool, the Fed may hold steady at least until October; if core inflation re-accelerates, expectations for a September rate hike could quickly heat up.
Under the Surface of Cooling CPI, Core Inflation is Key
Markets anticipate that the US July CPI will rise by just 0.1% month-over-month, following June's first decline in six years. The year-over-year increase is forecast to moderate to 3.4% from June's 3.5%, a further retreat from May's three-year high of 4.2%. Looking solely at headline CPI, the Fed appears to have little reason to rush into a rate hike. However, a sharp drop in gasoline prices during the first half of July may have artificially depressed the headline figure, making the core CPI, which excludes food and energy prices, the true metric to watch. Core CPI is expected to rise 0.2% month-over-month, with the annual rate easing from 2.6% to 2.5%. This suggests inflation is slowly improving but remains significantly above the Fed's 2% target, marking the sixth consecutive year it has exceeded that goal. Bob Edwards, Chief Investment Officer at Edwards Asset Management, noted that a 2.5% inflation rate is "not that far" from the 2% target. While not a victory, it represents progress. Of course, this improvement may not be enough to ease the concerns of the Fed's hawkish officials.
Services Inflation Emerges as the Biggest Concern
What Fed officials truly need to find in the CPI report is whether inflation is forming a new layer of stickiness, with particular attention on prices for services like rent and transportation. Services inflation has risen 3.2% over the past 12 months, up from 2.9% in early 2026, and has become a major reason why US inflation has struggled to return to the 2% target. For example, UBS Global Research economist Jonathan Pingle expects the indicator to firm up after June's surprisingly soft core inflation reading, driven by a rebound in core non-housing services, with prices for transportation, healthcare, and communication services likely returning to their normal pace of increase. The current rise in inflation does not necessarily signal a new wave of broad-based inflation. Some of this year's price pressures stem from rising oil prices and the lingering effects of tariffs from the Trump administration. With the end of the US-Iran conflict, energy prices could still fall further. The truly challenging issue is that after stripping out these temporary factors, underlying US inflation appears to be stuck at 2.5% or even higher, with no clear sign of a self-sustaining decline. This is why the Fed's decision last month saw a rare three dissenting votes in favor of a rate hike, with the final vote being 9-3 to hold rates steady. Thierry Wizman, Global Currency and Interest Rate Strategist at Macquarie Group, pointed out that even a benign CPI reading may not be enough to allay the concerns of Fed hawks about inflation running above target for years. Meanwhile, Fed Chair Kevin Warsh, while consistently emphasizing the need to push inflation back to target, has yet to back up his stance through concrete action.
September Rate Hike Decision Hangs in the Balance
Jeffry Bartash, a senior correspondent and economics analyst in MarketWatch's Washington bureau, believes Wednesday's CPI could be the decisive data point shaping expectations for September's rate policy. If core CPI rises by around 0.2% month-over-month, or even less, and against the backdrop of July's first drop in employment in six months, the Fed may have reason to continue its wait-and-see approach, further cooling September rate hike expectations. However, if core CPI rises to 0.3%, especially at or above 0.4%, market bets on a September rate hike could surge rapidly. Currently, Wall Street estimates the probability of a September rate hike at roughly 48%. This means that the July CPI does not need to produce an extreme result to change the market's view of the September meeting. Bartash also noted that this week's Producer Price Index (PPI) report is worth watching. While CPI and PPI may not directly determine the Fed's next move, the two data points will together form a crucial basis for the next policy decision. For the Fed, the question is no longer just whether inflation is falling, but whether it can sustainably converge towards 2% without additional rate hikes. If the answer is no, a September rate hike could become a reality. But if inflation remains moderate and the labor market shows further weakness, a hasty rate hike could further damage the already sluggish housing market and increase financing pressures for consumers and businesses. In short, the true focal point of this CPI report may come down to a single number: whether core CPI month-over-month can fall below the 0.2% threshold.
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