Yen nears 162 per dollar as Japan warns of intervention

Japan's top currency officials have signaled an increasing willingness to intervene in foreign exchange markets as the yen approaches its weakest level in four decades.

The yen slid to 161.80 per dollar Thursday, its weakest since July 2024, as Japanese officials escalated warnings of intervention to stem a decline that has persisted despite more than $70 billion in prior action.

"Japan is prepared to take decisive action on speculative moves," Finance Minister Satsuki Katayama said at a G7 meeting, according to reports. Bank of Japan Deputy Governor Ryozo Himino separately told parliament the central bank was closely monitoring currency movements because of their impact on the economy and inflation.

The currency has weakened beyond the 161 level despite more than $70 billion in interventions by the finance ministry in May and a BoJ rate hike in January that lifted borrowing costs to 0.5 percent, their highest level since 1995. A move beyond 161.96 would leave the yen at its weakest since 1986, when the currency traded at 162 per dollar during the Plaza Accord era. Elevated U.S. Treasury yields continue to support the dollar, with the 10-year yield near 4.3 percent, widening the rate differential that has driven the yen's decline. The Nikkei 225 has gained about 12 percent this year, benefiting from the weaker yen that boosts exporter earnings.

The weakening yen has boosted Japan's exports and economic growth but raised concerns about imported inflation and the erosion of household purchasing power. Japan's import costs have risen sharply, with energy and food prices climbing as the yen falls. The government faces a policy dilemma: a weaker yen supports corporate profits and the export-driven economy, but it also squeezes consumers and small businesses that cannot pass on higher costs. Structural factors — including the U.S.-Japan rate gap and Prime Minister Sanae Takaichi's growth-focused policies favoring relatively accommodative monetary conditions — suggest any intervention may provide only temporary relief, analysts said. Experts told CNBC that intervention efforts were largely ineffective because the factors affecting the currency were structural rather than speculative.

Intervention's Limited Track Record

The finance ministry's May interventions, totaling more than $70 billion, failed to establish a durable floor under the yen. The last time Japan intervened at a similar scale was in October 2022, when the yen weakened past 150 per dollar. On that occasion, intervention temporarily strengthened the currency by about 5 percent before the trend resumed within weeks, according to BoJ data. The pattern suggests that without a narrowing of the U.S.-Japan interest rate differential, intervention alone is unlikely to reverse the yen's trajectory. The BoJ's January rate hike to 0.5 percent has done little to close the gap with U.S. rates above 5 percent.

The 162 Threshold

Markets are now watching the 161.96 level — a break above which would put the yen at levels not seen since 1986. USD/JPY options skew has shifted, reflecting demand for protection against a sudden yen strengthening if Tokyo acts. The next key event is the BoJ's July policy meeting, where another rate hike could provide some support. However, with the Federal Reserve holding rates at 5.25 percent to 5.5 percent, the interest rate differential remains the dominant force driving the yen lower. Traders are pricing an elevated risk of intervention before the BoJ's next decision, with the 162 level seen as a potential trigger for action. If Tokyo does intervene, the impact may be measured in days rather than weeks, based on the 2022 precedent.

This article is for informational purposes only and does not constitute investment advice.