Japan and U.S. Stay Aligned on Yen Policy — But the Currency’s Sudden Surge Is Changing the Game

TOKYO — Japan and the United States remain closely aligned on foreign-exchange policy and are continuing to communicate on how to keep currency markets orderly, Japanese Finance Minister Satsuki Katayama said Tuesday.

Katayama said Tokyo’s position has not changed since Japan and the United States coordinated to support the yen in late July, signaling that Japanese authorities remain prepared to respond if currency movements become excessively volatile or disorderly.

“We remain in close communication with the U.S. Treasury,” Katayama said, pointing to discussions with U.S. Treasury Secretary Scott Bessent during recent Group of 20 meetings and other occasions.

The renewed warning comes at a striking moment for the yen.

After sinking toward the ¥160-per-dollar level in late August, the Japanese currency has staged a powerful rebound. The yen climbed to around ¥153.53 per U.S. dollar on Tuesday, reaching its strongest level in about seven months and gaining roughly 4% from its recent lows.

Why the yen is suddenly surging

The rally reflects a dramatic shift in expectations surrounding Japanese monetary policy.

Investors are increasingly betting that the Bank of Japan will raise interest rates as inflationary pressures persist and economic conditions provide greater room for tighter policy. Japan's second-quarter GDP was also revised upward to an annualized 1.4%, strengthening expectations that the central bank could continue moving away from its ultra-loose monetary-policy era.

At the same time, traders are reassessing Japanese investors’ overseas holdings, with expectations that some funds could eventually be repatriated into yen-denominated assets.

The unwinding of yen-funded carry trades — in which investors borrow cheaply in yen to invest in higher-yielding assets elsewhere — is another factor capable of accelerating the currency's gains.

Japan is still watching the currency closely

Tokyo’s concern is not simply whether the yen is weak or strong.

Japanese officials have repeatedly stressed the importance of avoiding rapid and disorderly exchange-rate movements because extreme volatility can destabilize financial markets and raise costs for businesses and households.

Japan and the United States carried out a rare coordinated yen-buying intervention in late July after the currency approached a 40-year low near ¥164 to the dollar. The intervention helped push the yen higher, although it initially failed to establish a lasting floor for the currency.

Japan’s top currency diplomat, Atsushi Mimura, subsequently said Tokyo remained on alert and continued to maintain contact with U.S. authorities.

The latest comments therefore carry an important message for financial markets: Tokyo and Washington have not abandoned their coordinated approach to currency stability.

But another intervention may not be imminent

Despite the warnings, the recent yen rally does not automatically mean Japan and the United States are preparing another intervention.

The key question is whether market movements are considered disorderly rather than simply reflecting changes in economic fundamentals.

Bessent previously indicated that recent yen movements were relatively contained, suggesting Washington did not necessarily view the latest fluctuations as sufficient grounds for another joint market operation.

That distinction is becoming increasingly important as the yen strengthens.

A rapidly rising yen could help reduce the cost of imported goods and energy for Japan, potentially easing some inflationary pressure. But an excessively fast appreciation could also create challenges for exporters and companies whose overseas earnings are converted back into yen.

All eyes now turn to the Bank of Japan

The next major catalyst could come from the Bank of Japan.

Markets are closely watching the central bank for signals about whether it will raise its policy rate from its current level. Expectations of additional tightening have already helped fuel the yen's recent rally.

Meanwhile, investors are also watching U.S. inflation data and Federal Reserve policy expectations, which could alter the interest-rate gap between the two economies — one of the most important drivers of the dollar-yen exchange rate.

For now, Katayama's message is clear: Japan and the United States remain committed to close coordination.

But with the yen moving sharply in the opposite direction from where it stood only weeks ago, markets are now asking a bigger question:

If the yen's rally accelerates, will Tokyo and Washington still see the need to intervene — or will they allow the market to take the currency higher?

WWC ONE MEDIA M.J.E