Iran war intensifies pressure on US inflation

The Iran war has led to the closure of the Strait of Hormuz, a critical chokepoint that handles about 20% of the world’s oil trade. This disruption has tightened global oil supplies and driven energy prices higher across major markets.

With flows through the strait curtailed, supply concerns have intensified and contributed to broad-based price increases. Projections cited in recent analyses suggest oil prices could reach $100 per barrel if the disruptions persist, amplifying inflationary pressures worldwide.

The supply shock has fed directly into U.S. fuel markets. By April 30, average U.S. gas prices per gallon had climbed to $4.30 for regular, $5.16 for premium, and $5.50 for diesel. These levels underscore how quickly energy costs have adjusted to the conflict-driven constraints.

Compared with conditions before the Iran war began on February 28, these averages represent sharp increases, with regular gasoline up $1.32 per gallon, premium up $1.30, and diesel up $1.74. The acceleration in fuel costs has become a central channel through which the conflict is affecting U.S. consumers and businesses.

Higher gasoline and diesel prices are raising transportation and logistics costs, which tend to filter through to a wide range of goods and services. This dynamic is a key reason policymakers and economists are closely tracking the energy shock’s impact on the broader inflation outlook.

Reflecting the energy-driven price pressures, the Federal Reserve has revised its near term inflation expectations. Its forecast for May inflation has been raised to 3.89%, compared with 3.56% in April. This marks a cumulative increase of nearly 150 basis points over the past three months.

Officials attribute much of this upward revision to the Iran war’s impact on oil supply and the knock-on effects on fuel and transportation costs. The updated forecast highlights how geopolitical supply shocks are feeding into the central bank’s assessment of price stability risks.

Beyond the immediate outlook, economists have also raised their longer term projections for U.S. inflation. Forecasts for 2026 inflation now stand at 4.2%, which is 1.2 percentage points higher than previous predictions.

Analysts link this revision largely to the ongoing war and its effects on energy markets. Persistently higher oil and fuel prices, if sustained, are seen as key drivers behind the expectation that inflation will remain elevated further into the decade.

These revised estimates underscore concerns that the current energy shock may not be confined to a short term spike but could shape the inflation path over several years, depending on how long the conflict and associated supply disruptions last.

The closure of the Strait of Hormuz and resulting oil supply disruption are not only a U.S. issue but a global one. With a fifth of global oil trade affected, energy importers worldwide are facing higher costs that may feed into their domestic inflation rates.

Analysts warn that if the conflict and disruptions persist, further escalation in oil prices could intensify inflationary pressures across both advanced and emerging economies. The situation remains fluid, with energy markets and inflation forecasts closely tied to developments in the region.