Limited account data discrepancies: Did the Bank of Japan not actually intervene in the yen last week?

The latest current account data released by the Bank of Japan does not show clear signs indicating that Tokyo authorities intervened to buy yen last Friday, despite significant market volatility that day. This marks the first potential intervention window since July 2024. Although the data does not confirm any action, the authorities' tough rhetoric has heightened market vigilance over a potential policy shift.

The Bank of Japan's Monday release showed that, due to fiscal factors, the current account balance is expected to decrease by 630 billion yen on Tuesday. Although this figure exceeds the average forecast of approximately 167 billion yen by currency brokers, the gap between the two is much less than the minimum single-intervention amount of 729 billion yen since 2022. This relatively small difference makes it difficult for the market to judge whether the authorities conducted a small-scale “probing” purchase or did not step in at all.

Although there is a lack of definitive evidence in the data, the yen continued to rally, with USD/JPY dropping more than 1% to 154.01 on Monday. This is mainly due to a series of tough statements recently made by Japanese Prime Minister Sanae Takaichi and finance officials. Takaichi warned of crackdowns on market speculation and promised to take action when necessary. In addition, market speculation arose that a rare “price inquiry” by the New York Fed could be a precursor to intervention, even sparking discussion about the possibility of a “Plaza Accord 2.0”.

This series of developments comes at a sensitive period ahead of Japan’s February 8th general election. Takaichi made it clear that she will resign if the ruling coalition fails to win a majority, adding a layer of political uncertainty to the markets. Meanwhile, the yen’s rebound has eased pressure on Japan’s super-long-term government bond market. This policy-driven “controlled reset” is reshaping investor expectations for Japanese assets.

Ambiguous Data, Difficult to Prove Intervention

According to Bank of Japan data released Monday, the estimated decrease of 630 billion yen in the current account balance due to fiscal factors, although higher than the average forecasted drop of about 167 billion yen from Central Tanshi, Ueda Yagi Tanshi, and Tokyo Tanshi Research, does not constitute “hard evidence” of substantial intervention by authorities last Friday.

The gap between the data and estimates is significantly narrower than the lower bound of intervention seen since 2022. Statistics show the smallest intervention since then was 729 billion yen (about $4.7 billion USD). This ambiguity makes it impossible for analysts to confirm whether the authorities implemented a very small-scale covert intervention, or merely relied on “verbal intervention” to guide market expectations.

Officials Take a More Hawkish Stance

Although actual intervention remains a mystery, the intensity of Japan’s official verbal warnings is clearly escalating. On Monday, Prime Minister Takaichi reiterated she would closely monitor speculative movements and act when necessary. Previously, she had pledged to use “all necessary measures” to address abnormal volatility. Discussing market moves, she noted various factors behind the fluctuations and emphasized that Japan’s primary budget has turned positive for the first time in 28 years, and the government will continue to focus on fiscal sustainability.

Meanwhile, close communication between Finance Minister Katsuki Katayama and U.S. Treasury Secretary Bessent, along with reports that the New York Fed has contacted financial institutions to inquire about the yen’s exchange rate, have further fueled market speculation about joint action. State Street Global Advisors senior fixed-income strategist Masahiko Loo said historical experience shows that price inquiries by the Ministry of Finance are often a precursor to action. Without follow-up, this might even fuel speculative pressure, prompting markets to test the official bottom line.

Market Speculation Over “Plaza Accord 2.0”

With signs of U.S.-Japan coordination emerging, some traders are beginning to recall the 1985 “Plaza Accord.” Pinnacle Investment Management chief investment strategist Anthony Doyle believes that Japan cannot solve its yen problem alone without risking domestic backlash or global spillover. Thus, the idea of a “Plaza Accord 2.0” — a coordinated intervention — no longer seems far-fetched. He noted that when the U.S. Treasury starts to get involved, it usually means the situation has gone beyond normal currency fluctuations.

Lombard Odier senior macro strategist Homin Lee commented that, if stabilizing the USD/JPY exchange rate is truly the goal, Tokyo will ultimately have to resort to actual intervention. He believes joint market intervention by the U.S. and Japan would be an “unusually public display of bilateral coordination.” According to public records, the U.S. has only intervened in the FX market three times since 1996, the most recent being after the 2011 Japanese earthquake.

Asset Prices Face Reset

The yen’s rebound is triggering a repricing of Japanese financial assets. As short positions on the yen reach their highest levels in over a decade, the current rally may force mass short-covering. This has led to volatility in Japan’s government bond market. On Monday, the benchmark 10-year JGB yield dropped three basis points to 2.225%.

More critically, a stronger yen is providing breathing space for Japanese bond issuance. The key 40-year JGB yield, which previously surged past 4%, has retreated. Bloomberg strategists note that for the upcoming 40-year bond auction this Wednesday, a firmer yen will be a significant relief, making the sale appear set for success. This marks a policy-driven market reset, as one-way bets on a weaker yen and selling Japanese bonds are rapidly losing appeal.

Policy Maneuvering Ahead of the Election

Aside from market dynamics, political factors have also become a key variable affecting the yen. Facing the snap election scheduled for February 8th, Takaichi is tying her political fate to the election outcome, vowing to resign as Prime Minister if the ruling coalition loses.

On policy, Takaichi revealed hopes to submit a bill to delay the food tax in fiscal 2026 and continues to support companies in achieving wage growth. These policy pledges, intertwined with currency stabilization measures, together form a complex macro backdrop ahead of the election. Reviewing 2024, the Japanese government spent nearly $100 billion to support the yen, with all four interventions occurring near the 160 level. Now, as the yen again nears critical levels, expectations for further action remain high.

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