A fresh inflation update is intensifying concerns that the Federal Reserve may face less room to cut interest rates and could even consider additional hikes. According to the Kobeissi Letter, new data for May shows headline CPI inflation rising to 4.2%, the highest level since April 2023. The report also indicates that core CPI inflation increased to 2.9%, marking the highest reading since September 2025. Together, these figures suggest that price pressures are re-accelerating rather than continuing to cool.
The headline number—now above the psychologically important 4% threshold—signals that overall inflation in the United States has officially returned to levels not seen for more than a year. This is important for markets and policymakers because it challenges the narrative that inflation is steadily converging back toward the Fed’s goals. When inflation reappears above levels considered acceptable, it becomes harder for the central bank to justify rapid easing. That is especially true if the broader trend suggests that the recent slowdown may be fading.
Equally notable is the core CPI increase. Core inflation excludes food and energy and is often viewed as a more reliable measure of underlying inflation trends. The Kobeissi Letter notes that core CPI inflation has climbed to 2.9%, the highest since September 2025. This matters because it implies that even the more stable components of inflation are not fully under control. In practical terms, investors typically interpret rising core inflation as a sign that wage and demand pressures—along with pricing power—may still be present.
The Kobeissi Letter frames these developments as a significant divergence from the Fed’s stated target. It notes that inflation is more than double the Fed’s target. The Fed’s policy goal is widely understood to be around 2% inflation; moving further away from that benchmark suggests the central bank is not yet operating in a sufficiently low-inflation environment to feel confident that restrictions can be reduced. If both headline and core measures are rising, the Fed would likely perceive a higher risk of inflation sticking at elevated levels.
The immediate implication highlighted in the message is that the odds of Fed rate hikes are increasing. When inflation data comes in hotter than expected, rate-hike probabilities often rise because policymakers may need to keep borrowing costs higher to cool demand, slow wage growth, and reduce inflation momentum. Even if the Fed eventually wants to lower rates, it generally requires convincing evidence that inflation is trending down sustainably. A CPI acceleration can therefore delay or even reverse expectations for rate cuts.
This shift in expectations can also affect financial markets broadly, since interest-rate expectations influence bond yields, the dollar, equity valuations, and mortgage rates. Higher expected policy rates can translate into tighter financial conditions even without the Fed actually raising the fed funds rate immediately. In other words, a hotter inflation report can cause markets to reprice risk and adjust discount rates, leading to ripple effects across many asset classes.
The Kobeissi Letter’s emphasis on the time markers—headline CPI at a highest level since April 2023 and core CPI at a highest level since September 2025—underscores that these are not minor fluctuations. They point to a meaningful change in inflation momentum. For the Fed, the question is not only the latest print, but also whether it reflects a temporary bump or a broader re-acceleration. If the data pattern continues, the central bank’s reaction function typically becomes more hawkish.
Overall, the story centers on the idea that US inflation is back above 4% and that underlying inflation pressures, as measured by core CPI, have also climbed. With inflation reported to be more than double the Fed’s target, the message argues that policy uncertainty is increasing and that the probability of additional restrictive action is rising. As investors and policymakers digest the new CPI results, future inflation prints and other indicators—such as employment, wages, and consumer demand—will likely become even more scrutinized to determine whether the recent increases are the start of a sustained trend or a one-off deviation.
Source: Kobeissi Letter
The Kobeissi Letter: BREAKING: May CPI inflation rises to 4.2%, the highest level since April 2023. Core CPI inflation also rises to 2.9%, the highest since September 2025. Inflation in the US is officially back above 4% and more than double the Fed’s target. Odds of Fed rate hikes are rising.. #breaking
— @KobeissiLetter May 1, 2026
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