Bank of America projects that a renewed rise in oil prices, linked to tensions in the Middle East, will probably lift Japan's core consumer price inflation above 3% in early 2027 and could lead the Bank of Japan to take a more hawkish policy stance.
The firm describes the mechanism by which higher crude costs filter into consumer prices as occurring through three principal channels over roughly a year. First, retail gasoline prices tend to adjust quickly following oil-price moves. Second, electricity tariffs typically respond with a lag of about six months, the result of Japan's fuel cost adjustment rule. Third, cost pass-through into non-energy items accumulates more slowly and reaches its peak roughly a year after the initial shock.
At present, core consumer price inflation in Japan sits below 2%, but Bank of America expects that as cost pressures spread from energy into a wider set of goods and services, core inflation will return above the 3% threshold in early 2027. The bank also notes near-term factors that are moderating headline inflation: government subsidies are restraining energy inflation for now, and unfavorable base effects in food prices should cause headline year-over-year inflation to decelerate through the summer.
Bank of America judges the balance of risks around a renewed inflation acceleration to be tilted to the upside. It highlights that petrochemical-related input costs - including naphtha - have already climbed past levels seen in 2022, which suggests a quicker and larger pass-through of costs from upstream producers to midstream firms. The bank also observes that companies are increasingly passing on higher costs to customers as inflation expectations rise.
The central question the firm poses is whether what begins as a temporary supply shock will generate second-round effects that embed themselves in underlying inflation. With inflation expectations already close to 2%, there is a heightened risk that expectations could overshoot and remain elevated. Should those second-round dynamics materialize, Bank of America says the Bank of Japan could respond by tightening policy further - potentially through a faster pace of rate increases, a higher terminal rate, and a more hawkish communications strategy.
This analysis focuses on the transmission of energy price shocks into consumer inflation and the potential policy reaction from Japan's central bank. It underscores the interplay between upstream commodity price moves, midstream cost pass-through, and firms' pricing behavior as inflation expectations shift.