Key Takeaways

• Headline CPI accelerates: Annual consumer prices rose 4.2% in May — up from 3.8% in April and the hottest reading since April 2023.
• In line with expectations: The print matched forecasts, offering no major surprise to markets.
• Monthly CPI cools slightly: Month-on-month inflation eased to 0.5% from 0.6% in April, meeting estimates.
• Core CPI at 2.9%: The annual underlying figure crept slightly above the prior month, also matching forecasts.
• Core monthly surprise: Month-on-month core CPI came in at 0.2% — below the 0.3% expected and down from 0.4% in April.
• Gasoline the culprit: Pump prices surged 7% month-on-month and a staggering 40.5% on a 12-month unadjusted basis.
• Hormuz closure driving the shock: The strait has remained effectively shut to tanker traffic for four months, draining global oil supplies.
• Rate cut bets all but dead: Expectations of a 2026 Fed cutting cycle have been effectively wiped out.
• December rate hike firmly priced: Hot inflation plus a resilient labor market keeps Fed tightening bets alive.
• Fed to hold next week: The June 16-17 meeting is widely expected to result in no change, per CME’s FedWatch Tool.
• New Fed Chair Kevin Warsh: The recently installed chair will preside over next week’s pivotal meeting.
• Capital Economics: “As good as doves could hope for”: Core goods fell 0.1% monthly; medical care commodities and new vehicle prices also declined.
• Trump policy helping core: Tariff-related price pressures eased; drug cost initiatives also helped cool medical prices.

U.S. consumer price growth accelerated on an annualized basis in May, driven by an uptick in gasoline prices, in the latest sign of inflationary pressures stemming from the Iran war.

Headline consumer prices rose 4.2% in the twelve months to May — accelerating from 3.8% in the preceding month and in line with expectations. It was the hottest such reading since April 2023.

Month-on-month, the key inflation gauge stood at 0.5%, cooling from 0.6% in April and also meeting estimates.

Stripping out volatile items like food and fuel, the Labor Department’s so-called “core” consumer price index came in at 2.9% year-on-year — slightly faster than the prior month and matching forecasts. On a monthly basis, the underlying figure eased to 0.2%, compared to 0.4% in April and projections of 0.3%.

Hormuz Closure Drives the Energy Shock

Investors have been keeping close tabs on incoming inflation data, particularly as the conflict in Iran drags on into its fourth month. Despite diplomatic efforts to end the fighting, a shaky ceasefire has taken hold. Crucially, the Strait of Hormuz has remained effectively closed to tanker traffic — depriving the world of key oil supplies and pushing up crude prices.

Worries have abounded that an energy shock caused by the war will, in turn, spark a burst of inflation. In the United States, Americans have been particularly feeling this impact at the gas pump.

Month-on-month, gasoline prices jumped 7% in May. On an unadjusted 12-month basis, the figure has surged by 40.5%.

Fed Rate Hike Bets Solidify

Markets have increasingly bet that hotter U.S. inflation — coupled with data showing a resilient labor market — will persuade the Federal Reserve to hike interest rates this year. Wagers at the beginning of 2026 that the Fed would embark on a rate-cutting cycle have been all but eradicated.

Now helmed by new Chair Kevin Warsh, the Fed is anticipated to keep rates steady at the conclusion of its upcoming two-day policy meeting next week, according to CME’s FedWatch Tool.

Silver Lining for the Doves

Still, the details of the May consumer price index were “about as good as” the more dovish members of the rate-setting Federal Open Market Committee could have hoped for, said Stephen Brown, Chief North America Economist at Capital Economics. Core goods prices fell 0.1% month-on-month, largely because of declines in categories that had been previously elevated by President Donald Trump’s sweeping tariff agenda.

Medical care commodities prices decreased as well — which analysts suggested were connected to the Trump administration’s push to lower drug costs. New vehicle prices also decreased, as did transportation services costs, despite a gain in airfares.