The May inflation numbers are due out Wednesday morning. Here's what to expect

• Headline CPI is forecast at 4.2% year-over-year (up from 2.4% a year ago) with a 0.5% monthly gain; core inflation expected at 2.9% annually after a 0.3% monthly increase
• Analysts warn the inflation problem extends beyond oil prices to include money supply growth and AI-related pressures, making it 'stickier' than purely energy-driven
• Even if the Middle East conflict resolves quickly, oil prices may not return to prior lows due to significant supply chain disruption that cannot be quickly reversed

Summary:

The Bureau of Labor Statistics is set to release May's Consumer Price Index (CPI) data Wednesday at 8:30 a.m. ET, with economists expecting unwelcome results. Wall Street consensus forecasts headline inflation at 4.2% annually (0.5% monthly gain), marking the first time CPI exceeds 4% since May 2023 and the highest reading since April 2023. This represents a significant jump from 2.4% a year ago and 3.8% in April.

Core inflation, excluding food and energy, is projected at 2.9% annually (0.3% monthly), up from April's 2.8%.

Key Drivers:

Much of the headline increase stems from surging oil prices linked to the Iran war. However, analysts warn the inflation burst is broadening beyond energy, with concerns that higher oil costs are spreading throughout the economy and becoming entrenched in expectations.

Market Implications:

Liz Ann Sonders, Chief Investment Strategist at Charles Schwab, characterized this as "a broader inflation problem than just energy," citing money supply and AI-related factors contributing to persistent "sticky inflation." She warned that worse-than-expected numbers could negatively impact equity markets, as investor anxiety centers on inflation concerns.

The Trump administration maintains inflation will decline once Middle East conflicts resolve. However, Sonders cautioned against optimism, noting substantial supply chain damage means oil prices likely won't return to previous lows even after a peace resolution, as production disruptions can't be quickly reversed.

The data will be critical for traders assessing Fed policy direction and market positioning amid growing concerns about persistent inflationary pressures.