The May Consumer Price Index release on Wednesday will almost certainly show headline inflation crossing 4% for the first time since mid-2023, according to consensus forecasts from major Wall Street banks. The culprit is no mystery. Energy prices have surged following the escalation of hostilities between Iran and Israel, and those costs are now bleeding into everything from food transport to airline tickets.

The Federal Reserve, which had been inching toward rate cuts as recently as April, now faces the uncomfortable reality that its next move may be in the opposite direction. Futures markets are pricing in a 65% probability of a rate hike by September, a dramatic reversal from the 80% cut probability that prevailed just six weeks ago.

The energy transmission mechanism

Oil prices have climbed roughly 28% since early May, when Iranian-backed attacks on shipping in the Strait of Hormuz intensified. Brent crude is trading near $112 per barrel, a level not seen since the immediate aftermath of Russia's invasion of Ukraine in 2022. But the damage extends well beyond gasoline. Jet fuel costs are forcing airlines to add surcharges. Fertilizer prices—heavily dependent on natural gas—are rising again, threatening the autumn harvest economics. Trucking companies are passing through diesel costs to retailers, who are passing them to consumers.

The Cleveland Fed's inflation nowcast, which synthesizes real-time price data, suggests core CPI may also surprise to the upside, potentially hitting 3.6% versus the 3.4% consensus. That would represent the first acceleration in core inflation in eleven months.

The Fed's impossible position

Chair Jerome Powell has spent the past year carefully managing expectations around a soft landing. The narrative was elegant: inflation would drift toward target while employment remained robust, allowing for gradual easing. That story now reads like fiction.

A rate hike in the current environment would inflict real pain on an economy already showing signs of strain. Consumer credit delinquencies are rising. Housing affordability is at its worst level in four decades. Small business optimism surveys have turned sharply negative. Yet failing to respond to a genuine inflation resurgence risks unanchoring expectations—the one outcome central bankers fear above all others.

The bond market is already voting with its feet. The 10-year Treasury yield has climbed to 4.82%, its highest level since October 2023. The 2-year yield, more sensitive to near-term Fed policy, has punched through 5.1%.

Our take

This is the scenario that monetary policymakers spent three years hoping to avoid: a supply shock arriving precisely when demand-side inflation had nearly been vanquished. The Fed will likely hold steady in June while signaling hawkish vigilance, but that posture cannot last if energy prices remain elevated through summer. The uncomfortable truth is that geopolitics has handed the central bank a problem it cannot solve with interest rates alone. Higher prices are coming regardless of what Powell does next. The only question is whether he adds a recession to the bill.