US inflation surged to 3.8% in April 2026, the highest level since May 2023, as the Iran war triggered a global energy shock that pushed up gasoline, transport and grocery prices.

The Consumer Price Index (CPI) rose 0.6% month‑on‑month, with energy accounting for over 40% of the total increase. Gasoline prices are now 28.4% higher than a year ago, reaching more than $4.50 per gallon, their highest level since July 2022.

Why Inflation Spiked in April

1. Energy Shock from the Iran War

The 10‑week conflict has disrupted oil flows through the Strait of Hormuz, a key route for one‑fifth of global oil and LNG shipments. This has driven up fuel prices worldwide and sharply increased US gasoline and jet‑fuel costs.

2. Rising Transportation Costs

Airline fares jumped 20.7% year‑on‑year, reflecting the surge in jet fuel prices.

3. Higher Grocery Prices

Grocery prices rose 0.7% month‑on‑month, with meat prices rebounding after a brief decline.

4. Core Inflation Still Elevated

Core CPI (excluding food and energy) increased 2.8% year‑on‑year, indicating that inflation pressures are broadening beyond fuel.

Impact on Households

Economists warn that the energy shock is squeezing household budgets:

• The typical US household is paying $75 more per month due to higher fuel costs.
• Real wages fell 0.3% year‑on‑year, marking the first decline in three years.
• Inflation is now rising faster than wages, intensifying affordability pressures.

Government and Market Reaction

White House Response

President Donald Trump announced a temporary suspension of the federal gas tax (18.4¢ per gallon), though experts say the relief will be limited. He also rejected calls for airline bailouts despite soaring jet‑fuel costs.

Market Movement

• US stocks slipped as investors priced in prolonged inflation.
• European markets fell amid geopolitical uncertainty.
• Energy stocks supported UK markets despite broader declines.

Global Ripple Effects

The energy shock is affecting economies worldwide:

• Ghana faces renewed fuel‑price pressures as global crude rises above $105 per barrel.
• Switzerland has seen fuel, heating oil and air‑travel costs jump sharply.
• Bangladesh is experiencing fuel shortages, lost income and rising inflation.

What Happens Next?

We expect inflation to remain elevated through the summer, even if the conflict eases as the tailwind knock-on of higher oil prices continues to filter down the down. Some forecasts suggest CPI could fall back toward 3.3% by year‑end, but only if energy markets stabilise.

The Federal Reserve is now expected to delay interest‑rate cuts until it sees clear evidence that energy‑driven inflation is easing.

FAQs

Why did US inflation rise to 3.8%?

Because the Iran war disrupted global oil supplies, driving up gasoline, jet fuel and transport costs, which accounted for over 40% of the CPI increase.

How much have gasoline prices increased?

Gasoline prices are up more than 28% year‑on‑year, averaging over $4.50 per gallon.

Are grocery prices rising too?

Yes. Grocery prices rose 0.7% in April, driven by higher transport and meat costs.

Will the Federal Reserve cut interest rates soon?

Unlikely. The Fed has turned cautious due to the energy shock and is waiting to see whether inflation spreads further.

How are households being affected?

Higher fuel costs are adding about $75 per month to household expenses, and real wages have turned negative.

UK Inflation Preview – 20 May 2026

UK inflation is expected to remain elevated when the Office for National Statistics publishes April’s figures on 20 May 2026. The most recent data shows CPI rising to 3.3% in March, up from 3.0% in February, driven largely by higher transport and energy costs. Office for National Statistics

Key Drivers to Watch

• Motor fuel costs: Petrol and diesel prices rose sharply in March, with petrol up 8.6p per litre and diesel up 17.6p, largely due to the Iran‑related energy shock. This remains the biggest upward pressure heading into April.
• Energy bills: Domestic heating oil prices surged 95.3% year‑on‑year, the fastest rise since 2022, and may continue to feed into April’s data.
• Food and services inflation: Food inflation accelerated to 3.7%, while services inflation rose to 4.5%, suggesting broad‑based price pressures.

Market Expectations

Trading Economics models forecast UK inflation to edge up toward 3.6% for April, reflecting continued energy‑driven pressures.

Policy Implications

KPMG notes that the Middle East conflict has created an energy price shock that could push UK inflation above 3.5% in Q3, potentially limiting the Bank of England to one rate cut in 2026, with further easing delayed to 2027.