March Inflation Surges as Iran Conflict Drives Gasoline Prices Higher

Gasoline prices recorded their steepest monthly climb since the series began in 1967 last month, driving annual consumer inflation to 3.3% in March, the highest reading in nearly two years and a stark reminder of how quickly a military conflict half a world away can reach the American pump.

The Bureau of Labor Statistics reported Friday that the Consumer Price Index rose a seasonally adjusted 0.9% in March, triple the 0.3% pace recorded in February, when the annual rate stood at 2.4%. Gasoline alone surged 21.2% for the month and accounted for nearly three-quarters of the entire monthly increase. The broader energy index climbed 10.9%, its largest monthly gain since September 2005, pushing energy costs 12.5% above year-ago levels. Fuel oil is up 44.2% over the past 12 months.

The transmission channel from the Middle East to the American gas station runs directly through the Strait of Hormuz. The conflict, which began February 28 with U.S. and Israeli strikes on Iran, escalated sharply when Iran effectively closed the strait on March 4. The waterway handles roughly a fifth of the world's oil supply. Brent crude, which had been trading near $70 a barrel before fighting began, spiked to $118 by the end of March. As of Friday it had retreated to around $96, following a tenuous two-week ceasefire, though the Hormuz blockade appeared largely intact. The supply disruption also cut Gulf oil production by at least 10 million barrels per day by mid-March, according to reports from Kuwait, Iraq, Saudi Arabia, and the UAE combined.

Shipping costs amplified the damage. Vessel owners have grown reluctant to transit the region regardless of ceasefire status, and as one analyst noted, "shipping confidence, insurance costs, and logistical bottlenecks tend to persist well after hostilities ease." Airline fares, reflecting surging jet fuel costs, rose 2.7% in March, picking up from February's 1.4% increase. Food prices were flat for the month, though farmers and food manufacturers have already warned about fertilizer shortages tied to the conflict. Shelter costs rose 0.3% in March and 3% over the past year, tied for the lowest annual reading since August 2021, providing one of the few offsets in an otherwise punishing report.

The one piece of data that will determine the Federal Reserve's next move is core CPI, which strips out food and energy. Core prices rose just 0.2% in March and 2.6% year-over-year, both coming in 0.1 percentage point below analyst forecasts. The Fed is currently holding its benchmark rate in the 3.5%-to-3.75% range and had penciled in one rate cut for all of 2026. Raymond James chief economist Eugenio Aleman framed the calculus plainly: "As long as the increase in gasoline prices is not translating into an increase in the core measures of inflation, then the Fed is probably not going to react to the noise in the headline measures of inflation." The Federal Open Market Committee meets April 28 to 29.

LPL Financial chief economist Jeffrey Roach warned that the Hormuz closure's effects are still working through the system. "We should expect another one or two hot inflation prints, driven by transportation services and some durable goods categories," he said, projecting the second-order effects would add roughly 0.2 percentage points over the coming months and that "the Fed is clearly on hold for the next several meetings." EY-Parthenon chief economist Gregory Daco raised his December 2026 headline CPI forecast to 3.0% and sees core inflation around 2.6% year-over-year by year-end, with a possible spike toward 2.9% in core as recently as May or June.

For households already navigating consumer prices roughly 26% above pre-pandemic levels, the March shock lands unevenly. Lower-income families, who spend a larger share of their budgets on gasoline and food, face a proportionally heavier burden from energy-led inflation even as the core numbers suggest restraint elsewhere. The April report, due next month, will be the first test of whether jet fuel and goods costs have begun seeping into core categories; economists are specifically watching transportation services and durable goods for signs of second-wave pass-through. J.P. Morgan Private Bank senior markets economist Joe Seydl put the stakes in sharp relief: "Otherwise we're looking at the largest oil supply shock in post-World War II history.