The 160 Threshold Under Threat Again! Yen Nears "Intervention Red Line," Tokyo May Spend Money Again to Rescue the Currency

According to Zhihu Finance APP, the yen is nearing the critical 160 yen per US dollar level, putting renewed pressure on Tokyo policymakers to step in and support the local currency.

The yen at one point overnight fell 0.8% to 159.94 per US dollar before stabilizing, breaking out of its narrow trading range seen in recent weeks. This movement comes against the backdrop of US inflation data exceeding expectations, strengthening market bets that the Federal Reserve may hike rates further, leading to a stronger dollar.

Junko Mimura, Japan’s top official in charge of foreign exchange, said she strongly feels that the yen's movement in recent days has been “too fast” and stressed that it is far too soon to forget about this summer’s interventions. After her comments, the yen rose 0.1% on Thursday to 159.63.

Bank of Japan Governor Kazuo Ueda left room for additional rate hikes after keeping rates unchanged at the Bank’s October meeting. However, the prospect of further tightening by the Federal Reserve could once again widen the US-Japan interest rate gap and increase downward pressure on the yen. This recent bout of weakening also marks a reversal from recent weeks—earlier, during several rounds of market turbulence, the yen had regained some of its traditional appeal as a safe haven currency.

Carol Kong, strategist at Commonwealth Bank of Australia, said, “The recent rise in USD/JPY highlights how much the yen remains at the mercy of shifting Fed expectations. Even if the Bank of Japan speeds up its rate hikes, it is still difficult to be more ‘hawkish’ than the Fed.”

“If the 160 level is quickly breached, the alarms will go off in Tokyo. We will almost certainly see Japanese officials step up warnings against yen weakness very soon,” she added.

Although government officials have repeatedly emphasized that what triggers intervention is the speed and disorder of exchange rate moves, rather than a specific level, a break of 160 could still test their tolerance. Market watchers have long viewed this level as the possible “bottom line” for Japanese authorities—earlier this year, the yen breached this point and intervention followed.

In late July, Tokyo and Washington conducted their first joint intervention since 1998 to support the yen—after it had fallen to its lowest levels since the 1980s, raising the risks of shorting the currency. This summer, Japan intervened in the foreign exchange market three times to shore up the yen, spending a total of 15.4 trillion yen ($96.4 billion).

In September, US President Trump expressed concern about the weak yen during a meeting in New York with Japanese Prime Minister Sanae Takaichi. Japanese Finance Minister Satsuki Katayama and US Treasury Secretary Bessent have both signaled their willingness to step in again if necessary.

Bessent has repeatedly voiced support for a stronger yen and has effectively challenged traders to test her resolve; meanwhile, Katayama has warned speculators that she is prepared to act in the foreign exchange market again if needed.