Bank of Japan Expected to Raise Rates to 1% as Oil-Driven Inflation Reaches 28-Year Highs

Japan's central bank has been navigating its most consequential monetary policy period in decades, driven by an oil-fueled inflation shock that has pushed price pressures to multi-decade highs. The Bank of Japan (BOJ) had kept its policy rate at 0.75% — already the highest since September 1995 — through its March and April 2026 meetings, but markets had priced in an approximately 80% probability of a 25-basis-point hike to 1% at its mid-June meeting, which would represent borrowing costs not seen in Japan since the mid-1990s.

The catalyst is Japan's heavy dependence on imported crude oil from the Middle East. The ongoing conflict involving Iran has driven Dubai crude oil prices sharply higher, directly worsening Japan's terms of trade, squeezing corporate profits, and eroding household purchasing power through higher energy and goods prices. The BOJ's April 2026 Outlook Report revised the bank's core inflation forecast for fiscal 2026 sharply upward to the range of 2.5%–3.0%, from an earlier 1.9% projection, while simultaneously cutting its fiscal 2026 GDP growth forecast to 0.5%, down from 1%.

The pressure for tightening has been reflected in Japanese bond markets. The 10-year government bond yield climbed above 2.4% earlier this year — its highest level since the late 1990s — driven by expectations of BOJ rate hikes and a weak yen that amplifies imported inflation. The International Monetary Fund has urged the BOJ to continue gradually raising its policy rate toward a neutral level to contain underlying inflation. The April policy meeting featured an 8-1 vote to hold, with one member dissenting in favor of an immediate hike, signaling growing internal momentum for tightening.

The situation has been described by analysts, including Oxford Economics' head of Japan economics Shigeto Nagai, as a 'very light stagflation-like scenario,' with stagnant growth and inflation running above 2%. A move to 1% has significant implications for Japanese life insurers — among the world's largest institutional bond investors — whose government bond portfolios lose value as yields rise. Higher Japanese rates also tend to strengthen the yen, which could unwind global carry trades and affect financial markets across Asia, Europe, and North America.