Why the Japanese Yen is Weakening vs USD: Iran Tensions, Rate Gaps & Carry Trade Explained (2026)

The recent geopolitical tensions between the US and Iran have sent ripples through the global financial markets, with a particular impact on the Japanese Yen. As I delve into this topic, it becomes evident that the interplay between international relations, energy markets, and monetary policies creates a complex web of influences on currency values.

Geopolitical Tensions and Energy Markets

The escalating conflict between the US and Iran has led to a series of military strikes and counterattacks, with Iran's announcement to close the Strait of Hormuz sending shockwaves through global energy markets. Given Japan's heavy reliance on this critical waterway for its crude oil imports, the situation raises significant concerns about the country's economic stability. This development adds a layer of complexity to the already volatile currency markets.

US-Japan Rate Differential and Carry Trade

The persistently wide interest rate differential between the US and Japan has been a key factor in the Japanese Yen's relative weakness. With the US Federal Reserve expected to maintain its benchmark rate at a higher level than the Bank of Japan, the so-called carry trade, where investors borrow in low-interest currencies like the JPY to invest in higher-yielding currencies like the USD, remains active. This dynamic further undermines the JPY and supports the USD/JPY pair.

Safe-Haven Flows and Inflationary Concerns

The escalating tensions between the US and Iran have also triggered safe-haven flows into the USD, adding to the currency's strength. Additionally, rising crude oil prices have revived inflationary concerns, leading to expectations of at least one interest rate hike by the Fed in 2026. These factors collectively bolster the USD and contribute to the USD/JPY pair's intraday move higher.

Bank of Japan's Role and Currency Control

The Bank of Japan (BoJ) plays a crucial role in determining the Yen's value through its monetary policy decisions. While the BoJ has directly intervened in currency markets in the past, generally to lower the Yen's value, it refrains from frequent interventions due to political sensitivities with its main trading partners. The BoJ's ultra-loose monetary policy between 2013 and 2024 caused the Yen to depreciate against major currencies, but the gradual unwinding of this policy in recent years has provided some support to the Yen.

Policy Divergence and Bond Yields

Over the last decade, the BoJ's ultra-loose monetary policy stance has led to a widening policy divergence with other central banks, particularly the US Federal Reserve. This divergence has supported a widening differential between US and Japanese bond yields, favoring the USD against the JPY. However, the BoJ's decision in 2024 to gradually abandon its ultra-loose policy, coupled with interest rate cuts in other major central banks, is narrowing this differential, which could impact the USD/JPY pair's dynamics.

Safe-Haven Status of the Japanese Yen

The Japanese Yen is often considered a safe-haven investment, attracting investors during times of market stress due to its perceived reliability and stability. This characteristic means that the Yen's value tends to strengthen against other currencies deemed riskier during turbulent periods. As such, the current geopolitical tensions and market uncertainties could further bolster the Yen's safe-haven appeal.

Conclusion

In conclusion, the Japanese Yen's value is influenced by a multitude of factors, including the performance of the Japanese economy, the Bank of Japan's policy decisions, the differential between Japanese and US bond yields, and global risk sentiment. The ongoing geopolitical tensions and their impact on energy markets, coupled with the US-Japan rate differential and the safe-haven status of the Yen, create a complex landscape for currency traders. As the situation unfolds, it will be interesting to observe how these factors interplay and shape the future trajectory of the Japanese Yen.

Why the Japanese Yen is Weakening vs USD: Iran Tensions, Rate Gaps & Carry Trade Explained (2026)

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