Mitsubishi UFJ warns Bank of Japan may need jumbo rate hike to support yen

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Japan’s central bank might need to go bigger than anyone expected. Masayuki Koguchi, executive chief fund manager at Mitsubishi UFJ Asset Management, warned on June 5 that the Bank of Japan may need to deliver a larger-than-anticipated rate hike to arrest the yen’s slide and ease mounting pressure on Japanese government bonds.

The message is blunt: a conventional 25 basis point increase won’t be enough. Koguchi suggested that if inflation accelerates, the BOJ could potentially raise rates by 50 or even 75 basis points in a single meeting.

The BOJ’s policy rate sits at approximately 0.75% as of mid-2026, which is already the highest level in roughly 30 years. Market expectations already point toward a rate increase that would lift the BOJ’s policy rate to approximately 1.0% by the end of June 2026. Around 65% of economists anticipate a policy rate increase from the BOJ by month’s end.

To understand why this matters, you need to appreciate how unusual Japan’s monetary environment has been. The BOJ spent the better part of three decades keeping rates at or below zero, a policy designed to stimulate wage growth and consumer demand in an economy plagued by deflation.

Look at what happened in late July and early August 2024 when the BOJ delivered a modest rate increase. Global equity markets, including crypto, sold off sharply as carry trade unwinds cascaded through risk assets. A 50 or 75 basis point move would amplify that dynamic considerably.

For institutional investors with Japanese asset exposure, the MUFG warning represents a clear signal that the era of predictable, gradual BOJ normalization may be over. The risk-reward calculus around Japanese assets just shifted materially, and the next BOJ meeting carries more weight than any in recent memory.

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