WASHINGTON, APRIL 10, 2026 —
The Bureau of Labor Statistics released the March Consumer Price Index Friday morning — and the number confirmed what economists had been warning for weeks: the Iran war’s energy shock pushed inflation to its highest level since April 2024, abruptly ending a two-year trend of cooling prices that had been one of the few bright spots in the U.S. economy.
The CPI rose 3.4% year-over-year in March — up sharply from 2.4% in February — the largest single-month acceleration in the annual inflation rate in years. On a monthly basis, prices rose 0.9% in March alone, driven almost entirely by the explosive rise in energy costs as Iran’s closure of the Strait of Hormuz sent oil prices surging from $67 per barrel at the war’s start to above $110 by late March.
The core CPI — which strips out volatile food and energy prices — rose 0.4% monthly and 3.1% annually, also above expectations and suggesting that energy cost inflation is beginning to seep into the broader price level through transportation, shipping, and production costs.
What Drove the Jump
Energy was the overwhelming driver. The United States experienced its largest single-month jump in fuel costs since at least 1957 in March, according to Pantheon Economics. Gasoline prices rose more than 37% from pre-war levels during the period captured in the March report. Diesel surged toward record territory. Airline fuel surcharges were added. Shipping costs rose across virtually every category of goods.
Food prices accelerated. Food costs rose 0.4% in March — partly a direct pass-through from higher diesel and transportation costs, partly from fertilizer prices that have spiked due to the Strait of Hormuz closure (up to 30% of internationally traded fertilizers normally transit the strait).
Shelter costs remained sticky — rising 0.2% monthly, still elevated but slightly slower than recent months, suggesting the housing market slowdown driven by higher mortgage rates is beginning to dampen rent growth at the margins.
March CPI — Key Numbers
| Measure | February | March | Change |
|---|---|---|---|
| Headline CPI (annual) | 2.4% | 3.4% | +1.0 point |
| Headline CPI (monthly) | 0.3% | 0.9% | Largest monthly jump in years |
| Core CPI (annual) | 2.5% | 3.1% | Above target |
| Core CPI (monthly) | 0.2% | 0.4% | Accelerating |
| Energy costs | Moderate | Surged | Largest since 1957 |
| Food (monthly) | 0.4% | 0.4% | Persistent |
| Shelter (monthly) | 0.2% | 0.2% | Sticky but slowing |
| Fed rate cut probability (May) | Moderate | ~2% | Essentially zero |
What the Ceasefire Means for April’s Numbers
The March CPI report captures price data through the end of March — which means it predates the April 7 ceasefire that sent oil prices plunging 15% in a single day. The April CPI report — due in May — will begin to reflect the energy price relief if the ceasefire holds.
Oxford Economics had forecast before the ceasefire that inflation would climb above 4% by April if the war continued unabated. With oil now back below $95 per barrel after the ceasefire announcement and gas prices beginning to fall, the April number may come in significantly lower than that worst-case scenario.
But the relief is not immediate or guaranteed. Energy economists note that 187 tankers containing 172 million barrels of crude remain stranded in the Gulf. Infrastructure damage to Qatar’s Ras Laffan LNG complex will reduce LNG exports for months. And the ceasefire is only a two-week pause — if peace talks in Islamabad fail, prices could spike again.
What It Means for Fed Interest Rates
The March CPI virtually eliminates any possibility of a Federal Reserve rate cut at the April 29 meeting — CME FedWatch data now shows 98.4% of market participants expect the Fed to hold rates steady. The Fed’s target inflation rate is 2%. At 3.4%, the March number is nearly double that.
More significantly, Fed meeting minutes released Wednesday showed that some policymakers are actively discussing potential rate hikes — not cuts — if inflation continues to accelerate. That scenario would be devastating for mortgage rates, car loan rates, and the broader housing market.
The base case among most economists is that the ceasefire, if it holds, will begin pulling inflation back down by summer — with Oxford Economics forecasting a return toward 2.5 to 3% by year-end if the Strait of Hormuz fully reopens and peace talks succeed. The wildcard is the peace talks starting today in Islamabad.
What Consumers Should Know
For American households, the March number validates what millions have felt at the grocery store, gas station, and utility bill: prices jumped significantly in March and the Iran war was the central cause. The good news is that the worst of the energy shock — which occurred in late March when oil hit $113 — has already partially reversed.
The question is whether gas prices fall fast enough and far enough before April’s spending decisions are made. If gas drops to $3.70 by month’s end as analysts forecast, April’s CPI will reflect that relief. If the ceasefire collapses, inflation could spike further and the Fed could be forced into a position it has not occupied since 2022 — raising rates into a slowing economy.
