Coordinated Yen‑Buying Intervention Overview
On 31 July 2026, Japan and the United States carried out a coordinated currency‑buying operation aimed at pushing the USD/JPY exchange rate below the 155 level, which had become a perceived floor after earlier Japanese interventions failed to break it. The immediate objective was to create sufficient market demand for the Japanese yen and signal that multiple authorities were prepared to commit reserves.
Japan’s Reserve Position and Liquidity Capacity
Japan’s foreign‑exchange reserve portfolio totals approximately $1.3 trillion. At the end of June, the composition was $162 billion in deposits and $929 billion in securities, the majority of which are believed to be held in U.S. Treasury securities. About $283 billion of these securities are estimated to mature within the next year. Combined with interest income, the reserve holdings could generate roughly $27 billion of monthly liquidity without the need to sell assets outright.
Scale of the Recent Intervention and Funding Options
The July intervention is reported to have exceeded ¥10 trillion over three trading days. At that magnitude, the Ministry of Finance would likely need to supplement the purchase by either selling securities, borrowing against its Treasury holdings through the Federal Reserve’s Foreign‑and‑International‑Monetary‑Authority (FIMA) repo facility, or a combination of both approaches. The FIMA facility allows foreign monetary authorities to temporarily exchange Treasury securities for dollars, thereby reducing the necessity for outright bond sales. Japan currently faces a $60 billion counter‑party limit under the FIMA arrangement, and the relatively high cost of the facility may constrain its usage.
United States Funding Mechanisms
The U.S. Treasury can finance its portion of the intervention through the Exchange Stabilization Fund, which holds a mix of dollars, Special Drawing Rights, and foreign currencies. The Federal Reserve also has the capacity to match Treasury operations, although such matching is not mandatory. During the July action, Washington reportedly sold euros rather than dollars to acquire yen, indicating a reliance on euro reserves for the purchase.
Potential Follow‑On Actions and Market Impact
Future coordinated operations may require direct USD/JPY selling once the available euro reserves become limiting. The cooperation between the two governments expands the perceived firepower beyond Japan’s own reserves and signals the possibility of further policy moves, such as faster Bank of Japan rate hikes or fiscal adjustments. Following the intervention, analysts lowered their year‑end USD/JPY forecast from 152 to 149, reflecting the market’s expectation of a weaker dollar relative to the yen.