Amid geopolitical tensions sparked by the Iran conflict, the Japanese yen has weakened instead of following the traditional pattern of strengthening as a safe-haven asset, indicating a shift in how investors are pricing its protective function. Since last Friday, the yen has depreciated approximately 1% against the U.S. dollar, reaching around 157.5 yen per dollar. This movement diverges from past trends where the yen typically rose during periods of geopolitical stress due to buying surges and rapid unwinding of carry trades.

Following a sharp decline on Tuesday, Japan’s Finance Minister Satsuki Katayama stated that the government is monitoring market fluctuations with a strong sense of urgency and is prepared to take all necessary measures, including direct intervention. Analysts suggest that while this statement has temporarily provided a floor for the yen’s decline, downward pressure remains. Bank of Japan Governor Kazuo Ueda noted on Wednesday that the central bank is closely watching how exchange rates influence prices, emphasizing that exchange rates are increasingly affecting corporate behavior and that maintaining trust in the government’s fiscal health is crucial.

Several strategists and economists attribute the yen’s weakness to uncertainty surrounding Japan’s domestic policies and interest rate outlook, reduced hedging functionality due to rising volatility, and a reassessment of Japan’s inflation and monetary policy path as the Iran conflict drives up energy prices.

The logic behind the yen’s safe-haven appeal has shifted, as Japanese corporations are no longer repatriating overseas earnings on a large scale. Astris Advisory Japan strategist Neil Newman stated plainly, "The yen is no longer a safe-haven asset." He explained that one key reason the yen strengthened during past crises was market expectations that Japanese firms would quickly bring overseas profits back home. However, this behavior has changed. Newman noted that companies have not engaged in such repatriation for about four years. Instead, in Japan’s current economic environment, there is little incentive to bring funds back; corporations face pressure to invest abroad and continue to make significant overseas investments. The breakdown of the traditional "crisis-repatriation-yen appreciation" chain has weakened the yen’s response to geopolitical shocks.

Policy uncertainties are also weighing on the yen, with increased volatility reducing its appeal as a hedging tool. The yen’s weakness did not begin with the Iran conflict; over the past 12 months, it has fallen nearly 5%. Key factors influencing the market include Prime Minister Sanae Takaichi's expansionary spending plans and her resistance to further interest rate hikes by the Bank of Japan. J.P. Morgan's Chief Asia-Pacific Market Strategist Tai Hui believes that heightened volatility has significantly diminished the yen's attractiveness as a hedge. When assessing the Iran situation, investors consider how to hedge risks without introducing unexpected complications. In his view, Japan is at multiple policy crossroads with a new government, making the calculation for using the yen to hedge geopolitical risks unclear.

The Iran conflict amplifies energy and inflation risks, reinforcing expectations that interest rate hikes will be delayed. Japan is highly dependent on imported crude oil and natural gas, and rising energy prices due to the conflict increase upside risks to inflation. Nomura Research Institute economist Takahide Kiuchi stated that higher commodity prices would make the Bank of Japan "more cautious" about raising rates. He added that growing expectations for delayed rate hikes could further pressure the yen. Additionally, as part of a trade agreement with the Trump administration, Japan committed to investing $550 billion in the U.S. over the next three years in exchange for tariff reductions, an arrangement that may also influence the yen’s trajectory.

Despite increased expectations of official intervention, the market has not seen the typical rapid unwinding of carry trades that previously caused the yen to surge sharply. Amova Asset Management Chief Global Strategist Naomi Fink noted that the absence of clear carry-trade reversal suggests that "risk aversion is not extremely high," and the market’s reaction to the situation’s severity is less pronounced than in physical markets, such as Baltic freight rates and war risk insurance. Regarding exchange rates, Morgan Stanley MUFG Securities Japan Macro Strategist Koichi Sugisaki indicated that the Japanese government is becoming increasingly vocal about the possibility of intervention. Should the yen approach the 160 level against the dollar, market caution would rise noticeably.

For investors, this means the yen may experience short-term volatility, caught between fundamental downward pressures and the threshold for policy verbal intervention, as its safe-haven pricing is being recalibrated.