March CPI Rise Tied to Oil Shock

March CPI accelerated in March 2026, the Bureau of Labor Statistics said, after energy costs surged following the Iran war, lifting headline inflation and adding near-term uncertainty for markets and monetary policy.

Inflation Trends and Energy Impact

The Bureau of Labor Statistics reported on April 10 that the Consumer Price Index for All Urban Consumers rose 3.3% year-over-year for the 12 months ending March 2026, up from 2.4% in February. Seasonally adjusted, the index climbed 0.9% from February to March after a 0.3% gain the prior month. This marked the largest annual increase in two years, driven mainly by a sharp monthly rise in energy prices.

Core CPI, which excludes food and energy, increased 0.2% month-over-month and 2.6% year-over-year, slightly above the previous 2.5%. The food index was unchanged in March but rose 2.7% annually. Shelter costs increased 0.3% month-over-month, continuing to contribute to underlying inflation. By comparison, the personal-consumption-expenditures price index, a different inflation gauge, ran at about 2.8% year-over-year in February, above the Federal Reserve’s 2% target.

The energy index jumped 10.9% in March and 12.5% year-over-year. Gasoline alone rose 21.2% month-over-month, accounting for nearly three-quarters of the monthly increase in the overall index. This concentration shows the headline inflation surge was driven primarily by fuel prices rather than broad-based price gains.

Oil Prices and Market Implications

Brent crude traded near $73 per barrel before the Iran conflict, peaked above $100 on March 12, and stood at $95.88 on April 10. Front-month futures closed the first quarter at $118 per barrel. The Brent-WTI spread widened to about $25 per barrel late in March. U.S. gasoline prices averaged $3.98 per gallon on March 27 and $4.15 per gallon by April 10, a roughly 40% increase since February 28, directly raising household energy costs.

The Iran war began February 28 with U.S.-Israeli military action and disruptions to traffic through the Strait of Hormuz. A ceasefire was announced April 8, after the March data collection period. BLS price collectors recorded data throughout March, covering 31 of the conflict’s first 32 days and capturing the early oil shock in the official inflation figures.

Analysts had anticipated elevated energy readings before the release, and the actual data matched forecasts. Because energy accounted for most of March’s inflation increase, the surge could complicate the Federal Reserve’s near-term policy easing and will be closely watched as investors reassess rate-cut prospects. The ceasefire’s impact on oil prices will be a key factor in coming weeks.