The United States and Japan carried out coordinated foreign-exchange intervention on July 31, 2026, after the yen weakened beyond 163 to the dollar, its lowest level against the US currency since 1986. Japan bought yen, while the US Treasury used the New York Federal Reserve to sell euros and buy yen.
The intervention briefly strengthened the Japanese currency, with the dollar falling toward 155 yen before moving back into the mid-150s. The immediate goal was to slow an unusually rapid and disorderly decline, not to set a permanent exchange-rate target.
At a glance:
- The yen fell beyond 163 to the dollar before the intervention.
- Japan bought yen; the US Treasury sold euros to buy yen.
- The dollar later fell toward 155 yen before settling in the mid-150s.
- The Bank of Japan’s policy rate remained at 1 percent.
| Before July 31 | After the intervention | |
|---|---|---|
| Dollar-yen exchange rate | Above 163 yen per dollar, a level not seen since 1986 | The dollar fell toward 155 yen before trading in the mid-150s |
| Official market action | Japan was acting alone or preparing to act | Japan and the United States conducted coordinated purchases of yen |
| Immediate policy effect | The yen was under sustained downward pressure | The yen received short-term support, but its longer-term direction remained uncertain |
What the intervention involved
Currency intervention means a government or central bank buys or sells large quantities of foreign currency to influence its own currency’s value. To support the yen, Japanese authorities bought yen. The United States used Treasury resources in a less typical way, selling euros and purchasing yen through the New York Fed.
The coordinated action followed a sharp move in foreign-exchange markets. The US Treasury had alerted banks that it might intervene, and officials later confirmed that Washington had joined Tokyo. The New York Fed’s description of intervention operations says the trading desk can buy a foreign currency when the aim is to reduce the dollar’s value against it.
Why Washington had a stake
Japan’s weak currency has raised the cost of imported goods and energy for households, while also benefiting exporters and attracting foreign visitors. For Washington, however, the concern was broader: a disorderly yen decline could unsettle Treasury markets, funding conditions and investors’ willingness to hold Japanese assets.
Japan is a major holder of US Treasury securities, so a prolonged currency defense could create pressure to sell some dollar assets. A large, rapid sale could push US bond yields higher and increase government borrowing costs. That risk helps explain why the US supported a close ally even though it was not directly defending the dollar.
Why the yen weakened
The yen’s decline reflects a persistent interest-rate gap. The Bank of Japan’s benchmark rate stood at 1 percent after its July 30–31 meeting, while US rates remained substantially higher. That difference encourages investors to borrow or hold yen-linked positions while seeking better returns in dollar assets, adding pressure to Japan’s currency.
Japan also faces longer-running economic and policy challenges. Years of very low interest rates helped support growth but weighed on the yen, while a weak currency made imports more expensive. Expansionary fiscal plans and higher energy costs added to concern that inflation could remain politically difficult even as the government sought stronger growth.
What happens next
Intervention can change market expectations quickly, especially when two governments act together, but it does not remove the forces driving exchange rates. The yen’s improvement after July 31 showed that official buying could halt the immediate slide. It did not establish that the currency had entered a lasting recovery.
A durable strengthening would likely require a narrower US-Japan interest-rate gap or a clearer shift in Japan’s monetary policy. The Bank of Japan has raised rates from near-zero levels, but the 1 percent rate remains comparatively low. Unless fundamentals change, repeated intervention could provide temporary relief rather than a permanent solution.
Questions readers ask
Does the intervention guarantee that the yen will keep rising?
No. Buying yen can slow a rapid decline and discourage speculative selling, but exchange rates are also shaped by interest rates, inflation, trade flows and investor expectations. Without changes to those fundamentals, the yen could weaken again after the initial market reaction fades.
Why did the United States sell euros instead of dollars?
Selling euros to buy yen supports the yen without directly selling dollars. That gives Washington a way to influence the dollar-yen rate while limiting the appearance that it is deliberately weakening the US currency or changing its broader dollar policy.
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