The U.S. consumer price index (CPI) for May is set to be released Wednesday morning, with Wall Street consensus projecting a 4.2% annual inflation rate following an anticipated 0.5% monthly gain. This would mark the first time since May 2023 that the CPI has surpassed 4%, and it would be the highest reading since April of that year [1]. The headline inflation rate was just 2.4% a year ago, highlighting the significant acceleration in price increases [1].
A major driver of the rising headline number is the surge in energy costs attributed to the Iran war. However, core inflation—which excludes food and energy—is also expected to rise, with projections indicating a 2.9% annual rate after a 0.3% increase in May, according to Dow Jones [1]. In April, annual headline inflation stood at 3.8%, while the core rate was 2.8% [1].
Market participants are increasingly concerned that inflation is broadening beyond energy, as higher oil prices begin to impact the wider economy and raise expectations that inflation will remain persistent. Liz Ann Sonders, chief investment strategist at Charles Schwab, noted, "It's not just an oil story, it's a money supply story, and it's increasingly an AI story. So this is a broader inflation problem than just energy, meaning that we probably still have somewhat sticky inflation" [1]. Sonders also warned that worse-than-expected inflation data could negatively affect the equity market, given current investor skittishness [1].
While the Trump administration argues that inflation will quickly subside once the Middle East conflict resolves, Sonders cautioned that significant supply disruptions mean oil prices are unlikely to return to previous lows even with a swift end to the war. She emphasized that the damage to production cannot be reversed instantly [1]. The Bureau of Labor Statistics will release the official CPI reading at 8:30 a.m. ET on Wednesday [1].
CONCLUSION
May's CPI is expected to show a significant acceleration in U.S. inflation, driven by energy costs and broader economic pressures. Market sentiment is cautious, with concerns that persistent inflation could weigh on equities. The official data release is highly anticipated and could have a substantial market impact.