US inflation accelerated for the third consecutive month in May, with consumer prices rising 4.2% year-over-year, as the ongoing conflict in Iran continues to exert pressure on energy costs and the broader economy.
Analysis of Key Report Details
The latest data from the US Bureau of Labor Statistics shows the Consumer Price Index rose 4.2% in May compared to a year ago, marking the highest level since April 2023. Before the outbreak of conflict in the Middle East in February, the inflation rate was just 2.4%. Prices increased 0.5% on a monthly basis.
Energy prices were the primary driver of the increase, surging 3.9% from April. Excluding the volatile food and energy categories, the core CPI rose 2.9% year-over-year. Core prices increased 0.2% month-over-month, a deceleration from the 0.4% rise seen in April.
The rise in energy costs has spilled over into sectors heavily reliant on fuel, affecting airfares and food. Airline ticket prices jumped 2.7% in May and are up 26.7% over the past year. Hotel lodging prices increased 0.5%, potentially boosted by World Cup events, though actual room demand fell short of industry expectations.
The Federal Reserve will meet next week to decide on interest rates. Policymakers are closely watching whether the inflationary shock has spread to sticky components of core inflation, such as industrial goods and services. The slightly lower-than-expected core reading may reassure officials to hold rates steady for now, even as the labor market shows strength.
The conflict is not the only factor pushing prices higher. A global boom in AI data center construction has boosted demand for memory chips, reversing a long-term trend of falling tech product prices. Persistent droughts have also reduced output for some crops and livestock, creating particular tightness in beef supplies.
A key factor currently preventing a more severe price spiral is consumer spending power. Tax refunds have been spent, and recent wage growth has narrowed. Average hourly earnings have now grown slower than inflation for two consecutive months. The slowing price increases for some goods may stem from consumers' inability to afford higher costs.
Moody’s Chief Credit Officer Atsi Sheth noted, "Weakening corporate pricing power reflects businesses' assessment of end-consumer purchasing power and signals pressure on economic growth momentum. Despite a relatively low unemployment rate, household spending capacity is continuously shrinking."
Food price increases were significantly lower than feared, rising just 0.2% in May compared to a 0.5% increase in April. Grocery store food prices held down the overall figure, while prices for food away from home, such as at restaurants and bars, rose a modest 0.3%.
The Fed focuses on the core inflation measure, which excludes food and energy, as the best gauge of underlying price trends. The 0.2% monthly increase in core prices was seen as a positive sign, suggesting inflationary pressure has not yet spread broadly from energy-related categories across the entire economy. Broad-based diffusion would force the Fed to consider raising rates more quickly.
While economists expected the overall inflation figure to be high given recent energy price moves, the report contained several positive details: grocery food prices rose only 0.1%, new car prices declined, and housing-related inflation was relatively moderate. As previously indicated, the Fed's key core inflation metric came in below market expectations. These signs suggest high oil prices have not yet broadly fueled inflation across all goods, at least for now.
The White House has not yet responded to the data but has previously downplayed the worsening inflation, calling it a temporary side effect of the Iran conflict that will subside once hostilities end. However, recent escalations suggest a ceasefire agreement remains distant.
No Fed officials have publicly called for rate hikes, but policymakers acknowledge that the inflation rebound linked to the Iran conflict will likely delay the timing of any future rate cuts. This inflation report may further cement that view.
As expected, the overall inflation increase was almost entirely driven by energy, which rose 3.9% in May and is up 23.5% over the past year. Fuel was the main contributor, while electricity prices, boosted by data center demand and grid investment, rose 5.9% year-over-year.
Airline ticket prices surged 2.7% in May, up nearly 27% over the past year, directly due to higher global jet fuel prices stemming from the conflict.
Investor sentiment eased slightly as the inflation increase did not exceed worst-case fears and pressure remained concentrated in categories directly affected by oil. S&P 500 index futures recovered somewhat from session lows but still closed down 0.5%.
According to AAA, the national average for a gallon of regular gasoline was $4.15 on Wednesday, about $1 higher than a year ago. Even without sharp increases in other goods, high fuel costs continue to squeeze household disposable income.
Inflation this year has been almost entirely driven by energy. Excluding energy, prices over the past 12 months are up 2.9%, only slightly above the 2.7% level at the end of last year. Notably, this figure remains above the Fed's long-term 2% target, indicating an underlying inflation problem existed even before the Middle East conflict erupted.
Following the report, investor expectations for the Fed's next rate move saw little change. Markets are pricing in a high probability that the central bank will hold its benchmark rate steady in the 3.5%–3.75% range in July and September. The two-year Treasury yield, which reflects short-term Fed rate expectations, held steady around 4.1%.
Goldman Sachs Asset Management strategist Tim Urbanowicz stated, "Despite the recent sharp rise in both headline and core inflation, which poses headwinds for the macroeconomy and cyclical sectors, the AI investment cycle, potential benefits from the 'Magnificent Good Act', and the lagged effects of prior Fed rate cuts continue to provide substantial support for the economy."
This inflation rebound means price growth is once again outpacing wage gains. Inflation-adjusted average hourly earnings have fallen 0.7% over the past year, completely erasing the wage gains made early in the previous administration. In real terms, workers' incomes are now back to where they were when the current administration took office.
Grocery store prices continue to burden consumers, particularly those planning summer barbecues. Ground beef prices are up 12.1% from a year ago, hot dogs are up 7.7%, and lettuce and tomato prices are also significantly higher.
Egg prices may become a talking point in the midterm election campaigns: current prices are down over 35% from a year ago, though they rose 4% in May alone.
In other economic news, a separate report showed US foreign direct investment rebounded sharply in 2025 after four years of decline. Foreign investors deployed $232.2 billion last year, a 49.5% increase, primarily to acquire US businesses. This data may indicate multinational corporations are hedging against risks from new tariffs.
Prices for other goods showed mixed trends, with tariffs creating a complex picture. Household furnishings prices have declined in recent months and are up only 2.4% for the year, while apparel prices have climbed, rising 4.8% year-over-year. Prices for medical commodities, including prescription drugs, fell 1.8% compared to last year.
The White House attempted to frame the inflation report as evidence that the administration's economic agenda is delivering real benefits. A spokesperson acknowledged the conflict caused a "transitory disruption" but highlighted several positive indicators in the data, stating, "Thanks to this administration's policies, prices are falling for prescription drugs, dairy, cars, and health and auto insurance."
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