Unconfirmed reports and unofficial signals suggested the Ministry of Finance and the Bank of Japan intervened on Friday to support the Japanese yen. The focus is on how long the yen’s rise can last.
Future moves in the yen are linked to the duration of the war in Iran and related inflation worries, as well as Bank of Japan policy action. Recent yen weakness has been tied to market doubts that Japanese policymakers will respond strongly to inflation.
Yen Outlook And Policy Signals
With no clear shift in official messaging, the yen may stay the weakest of the G10 currencies. If energy market tensions rise again, the yen could face renewed downward pressure.
Lower interest rate expectations in Japan mean there is less for the Bank of Japan to exceed. If the blockade of the Strait of Hormuz ends within the next few months, markets may reduce the higher rate expectations currently priced for the ECB and the Fed.
By contrast, markets are pricing in two Bank of Japan rate rises by year-end. The article notes that the Bank of Japan may still deliver these two rises even if conditions in the Gulf region improve soon.
We are now looking back at the official “final warning” and suspected intervention that occurred around this time last year, in April 2025. At the time, there was doubt about whether the yen’s strength would last, as markets did not trust the Bank of Japan to act forcefully. The core issue was skepticism over the BoJ’s willingness to tackle inflation compared to other central banks.
Derivatives Positioning And Volatility
That skepticism proved to be a powerful trading signal for those who looked closer at market expectations. While the U.S. Federal Reserve has since cut its key interest rate to 5.0% as inflation cooled from its 2025 peak, the BoJ followed through on its modest promises. The resolution of the blockade in the Strait of Hormuz in late 2025 allowed energy prices to fall, removing the upward pressure on global inflation that had everyone so worried.
As predicted, the BoJ delivered the two rate hikes that were priced in, bringing its policy rate to 0.6% by the end of 2025, where it remains today. This follow-through, combined with the Fed’s pivot to a more dovish stance, helped drive the dollar-yen exchange rate down from its highs above 162 to the 145 level we saw earlier this year. This confirmed that the market’s low expectations for the BoJ were indeed easier to meet than the very hawkish outlook for the Fed.
Currently, with the CBOE Volatility Index (VIX) trading near a low of 13, complacency seems to be returning to the market. This has put renewed, gentle pressure on the yen as traders are once again drawn to the interest rate difference between Japan and other G10 nations. The dollar-yen has drifted back towards 149 in the past few weeks.
This environment suggests that derivative traders should consider positions that benefit from another potential surprise from the BoJ. With implied volatility low, buying JPY call options or USD/JPY put options with expirations in the next three to six months could be an inexpensive way to position for a shift. The market is once again underestimating the BoJ’s capacity to act, creating an opportunity similar to the one we saw back in 2025.
