US Treasury flags excessive yen volatility in semi-annual currency report

The US Treasury Department published its semi-annual report on the exchange rate policies of major trading partners on 23 July 2026, issuing a direct warning regarding the stability of the Japanese yen. The report, which analyses the currency policies of key economic partners, stated that excessive fluctuations in the yen exchange rate are undesirable.

This policy commentary emerges as the yen approaches 164 yen to the dollar, a depreciation level not seen in 39 years and 8 months. The Treasury’s intervention in the narrative aligns with broader market anxieties regarding the speed and magnitude of the currency’s decline against the US dollar.

The US Treasury conducts this bi-annual analysis to monitor the currency policies of major trading partners, assessing whether exchange rate movements align with fundamental economic conditions. By characterising excessive volatility as undesirable, the department signals a preference for stability over rapid directional shifts, a stance that carries significant weight in international financial markets.

The report’s release coincides with a complex macroeconomic backdrop. Concurrently, the Federal Reserve has maintained a hawkish stance on interest rates, while the European Central Bank kept rates steady. These monetary policy divergences have contributed to market turbulence, with the Nasdaq index falling by over 2% amid concerns over artificial intelligence investment sustainability and rising borrowing costs.

Geopolitical tensions further complicate the economic landscape. The Trump administration is preparing to implement new tariffs, with Japan facing an existing combined rate of 12.5 percent, while US military operations against Iran have continued for 13 consecutive days. These factors collectively influence investor sentiment and currency valuations, underscoring the interconnected nature of trade policy, monetary strategy, and global security.