Yen Hits 40-Year Low! USD/JPY Breaks 163 as Japan's Intervention Risk Rises

The US dollar surged past the 163 level against the yen on Tuesday (21st), marking the first time since 1986 that this level has been reached. As the yen continues to weaken to a 40-year low, speculation over potential Japanese government intervention in the currency market has resurged.

The US dollar strengthened for the fourth consecutive trading day, driven by ongoing tensions in the Middle East, rising international oil prices, and renewed market bets on further tightening by the US Federal Reserve (Fed). The USD/JPY pair briefly broke through 163, hitting a 40-year high (equivalent to the yen's weakest level in four decades), reigniting market speculation about potential intervention by Japanese authorities.

The Japanese government has previously emphasized that it is closely monitoring exchange rate movements and will take appropriate action when necessary. As USD/JPY continues to set new records, traders widely believe that the authorities' tolerance for further sharp yen depreciation is shrinking.

Japan has already taken action several times this year in response to yen weakness. At the end of June, when USD/JPY broke through 162, Reuters reported that Japanese officials reiterated their readiness to respond to abnormal exchange rate fluctuations, keeping markets highly alert to the timing of intervention.

In early July, market rumors emerged that Japanese authorities conducted a 'rate check' with traders—a move typically seen as a precursor to formal intervention—prompting a sharp short-term rebound in the yen.

Meanwhile, markets are also concerned that another intervention by Japan could trigger a global repricing of assets.

MarketWatch noted that the current market environment bears many similarities to the period before Japan's currency intervention in 2024, when the yen sharply rebounded, forcing unwinding of carry trades and negatively impacting risk assets such as technology stocks.

However, most analysts believe that without further monetary tightening by the Bank of Japan or a dovish shift by the Fed, the supportive effect of foreign exchange intervention on the yen may remain temporary.