Japan and the US have restated their agreement to refrain from manipulating foreign exchange (FX) rates. The finance ministers from both nations reaffirmed G7 commitments, emphasising that exchange rates should be dictated by the market.
They agreed to limit interventions to chaotic market situations and will disclose FX operations monthly. Their joint statement underscores their partnership, focusing on macroeconomic and exchange rate consultations. Both nations reiterated that exchange rates should be determined by the market, cautioning that excessive volatility and erratic movements can harm economic stability.
Commitment to IMF Rules
They confirmed commitments under IMF rules to avoid manipulating FX rates or the international monetary system for unfair benefits. The G7 pledge was restated, asserting that fiscal and monetary policy should focus on domestic goals with domestic tools, not on exchange rates.
The ministers also agreed that macroprudential or capital flow measures should not target exchange rates. They confirmed that government investment vehicles, like pension funds, invest abroad for returns and diversification, not to influence exchange rates. FX intervention will only occur to address extreme volatility, with a promise to disclose interventions monthly. The importance of transparent exchange-rate policies and practices was emphasised.
This joint statement signals that fundamental economic factors, not government action, will guide the USD/JPY exchange rate. Given that the pair has been testing the 168 level, this reaffirmation suggests a high tolerance for further yen weakness. We should therefore place greater emphasis on macroeconomic data releases from both nations in the coming weeks.
The primary driver remains the significant interest rate differential between the two countries. With the Federal Reserve holding rates at 4.75% following the August 2025 inflation print of 3.1%, and the Bank of Japan’s policy rate at a mere 0.25%, the incentive to hold dollars over yen is substantial. This wide gap continues to fuel the carry trade, putting persistent upward pressure on the pair.
Impact on Derivative Traders
For derivative traders, this statement should translate into lower implied volatility for USD/JPY options in the near term. The reduced threat of a sudden, surprise intervention removes a major source of uncertainty from the market. This environment could make strategies like selling out-of-the-money puts or calls more attractive.
We must remember the landscape from just a few years ago in late 2022, when Japanese authorities intervened heavily as the pair crossed the 150 mark. That historical precedent shows that while the bar for intervention is high, it is not infinite. The current statement defines that bar as “disorderly markets,” a deliberately vague term that still leaves room for action.
This joint agreement could be interpreted as a green light to test higher levels, as the explicit threat is now tied to the *speed* of the move rather than a specific price. We should be watching for rapid, one-directional moves of over 2 yen within a single trading day, as this could be classified as a “disorderly” market. Such a scenario, rather than a slow grind towards 170, would be the most likely trigger for official action.
The commitment to disclose any intervention monthly reinforces a focus on transparency, removing after-the-fact guesswork. It means we will have clear data on past actions, but it does not help predict future ones. Therefore, our focus should be on the upcoming US jobs report and CPI data, as these will have a more direct impact on the rate differential and the currency’s path.
