Japan’s foreign exchange reserves recorded their largest monthly decline on record in August as authorities carried out a major currency intervention to support the weakening yen.
The country’s foreign reserves fell by $79.6 billion during the month, reaching $1.208 trillion. The decline was mainly driven by Japan’s efforts to strengthen the yen through large-scale sales of U.S. dollars and purchases of the Japanese currency.
Between July 30 and August 26, Japan spent approximately $98.7 billion to support the yen, marking one of the largest currency interventions in the country’s history.
The intervention helped push the dollar-yen exchange rate lower, with the dollar declining from around 164 yen toward the 155 yen range. However, markets remain focused on whether the move can create a lasting recovery for the yen or only provide temporary support.
Japan’s authorities have been under pressure as yen weakness has increased the cost of imported energy and raw materials, creating additional challenges for inflation and household spending.
The decline in foreign reserves reflects the cost of defending the currency. Japan holds a large amount of foreign assets, including U.S. dollar-denominated securities, which can be used during periods of market stress to influence exchange rates.
The latest move highlights the difficult balance facing Japanese policymakers as they attempt to stabilize the yen while supporting economic growth. A prolonged period of currency weakness could increase inflation pressures, while aggressive intervention carries the risk of reducing available reserves.
For global markets, Japan’s currency actions could have broader consequences. Changes in Japanese dollar holdings and yen movements can affect bond markets, global liquidity, and investor positioning across major asset classes.
The yen is also closely watched in risk markets because of its role in global carry trades, where investors borrow in low-interest currencies to invest in higher-risk assets. A sharp change in yen conditions could increase volatility across equities, commodities, and cryptocurrencies.
The key question now is whether Japan will need additional intervention if yen weakness returns or whether monetary policy changes will become the main tool for supporting the currency.
