Bank of Japan data released Friday showed the corporate goods price index (CGPI), which measures prices companies charge each other for goods and services, rose 4.9% in April from a year earlier, sharply exceeding market forecasts for a 3.0% increase.
The annual increase was the fastest since May 2023 and accelerated significantly from March’s 2.9% rise.

The figures underscored the growing impact of higher import costs on Japan’s economy following disruptions to oil shipments through the Strait of Hormuz amid the Iran conflict. Japan remains heavily dependent on imported energy, particularly crude oil from the Middle East.

The yen-denominated import price index jumped 17.5% in April from a year earlier, marking the steepest increase since December 2022 and reflecting both elevated global energy prices and the weaker yen’s effect on import costs.

On a monthly basis, wholesale prices rose 2.3% in April after increasing 1.0% in March, the data showed.
Petroleum and coal product prices climbed 5.3% from a year earlier as crude oil and jet fuel costs rose, while chemical goods prices surged 9.2%, the strongest increase since September 2022. Naphtha prices soared 79.4%, according to the report.

The data came a day after a Bank of Japan policymaker called for raising interest rates “at the earliest stage possible” to contain inflationary pressures stemming from higher fuel costs and supply disruptions linked to the Middle East conflict.

Economists said the breadth of price increases would be closely monitored by policymakers assessing whether inflation pressures are becoming more entrenched across the broader economy.

“If price rises are contained to oil-related goods, there is little need for the BOJ to respond,” said Masato Koike, senior economist at Sompo Institute Plus.
“But if they broaden to a wide range of goods, the BOJ will likely have to raise rates,” he said.

The inflation surge adds to pressure on the central bank as it seeks to normalize monetary policy after years of ultra-low interest rates and stimulus measures aimed at reviving growth and inflation.