Yen slides past 163 mark to fresh 40-year low against US dollar

The yen slid past 163 per dollar for the first time since 1986, extending its decline and increasingly testing Japanese authorities’ resolve to intervene.

Japan’s currency fell as much as 0.5% to 163.24 per dollar overnight as the greenback strengthened alongside US Treasury yields after renewed tensions in the US-Iran conflict drove oil prices higher.

The move underscores how geopolitical tensions, Japan’s fiscal outlook and wide interest-rate differentials continue to overwhelm efforts to stabilize the currency. Authorities spent ¥11.73 trillion ($71.9 billion) intervening between April 28 and May 27, yet the yen remains at its weakest level in four decades. 

Finance Minister Satsuki Katayama last week used her strongest language in weeks to warn of possible currency intervention.

“Rising oil prices, the prospect of US rate hikes, and stimulatory fiscal and monetary policy conditions in Japan are fueling the trend — one that’s unlikely to end without a material course correction from Japanese authorities,” said Kyle Rodda, an analyst at Capital.com. “As a result, the markets will be on intervention watch.”

What Bloomberg strategists say...

USD/JPY’s rally is developing a momentum of its own, suggesting traders would treat any official intervention as an opportunity to reload yen shorts rather than abandon the trade.

Japanese officials have threatened decisive action so often without following through forcefully that intervention warnings no longer trigger the knee-jerk dollar selling they once did.

At this point, it may take something more substantial to turn the tide: persuading GPIF to repatriate funds, or a sudden collapse in US yields that crushes the carry trade. The latter hardly looks imminent while oil prices are pushing higher and keeping inflation risks alive.

— Mark Cranfield, Markets Live Strategist

Investors have largely shrugged off a series of policy initiatives that, in theory, should support the currency. Earlier this week, Japan’s cabinet approved an economic and fiscal policy plan with a footnote stating that it leaves specific monetary policy decisions to the Bank of Japan while respecting its autonomy, a move seen as helping ease concerns that political pressure could delay further interest-rate increases.

Officials have also floated proposals to encourage more domestic investment, including asking the Government Pension Investment Fund to review its asset allocation and considering allowing Japanese government bonds to be held in tax-free NISA accounts. While such measures could support the yen over time by encouraging repatriation, many investors see them as unlikely to offset the currency’s near-term headwinds.

Katayama has also stressed she has no authority to step into the fund’s investment decisions. By law, the GPIF must manage assets solely in the interests of pension beneficiaries rather than to support government policy.

Some strategists argue the gradual nature of the yen’s decline reduces the urgency for intervention.

“Although USD/JPY has now broken above 163, the move has been exceptionally gradual. My base case is still that the authorities will refrain from intervening,” said Rinto Maruyama, senior FX and rates strategist at SMBC Nikko Securities Inc. “Absent any intervention, 165 appears to be the next major level the market will focus on.”

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Published on July 22, 2026