Why did Japan and the United States intervene to support the yen?

On 31 July 2026, Japan and the United States jointly entered the foreign-exchange market to buy yen. The operation followed a fall to nearly JPY 164 per US dollar, close to the currency’s weakest level in about 40 years. USD/JPY then moved back towards 157 over two days as Japan acted and US support became clear.

What happened during the joint yen intervention?

A currency intervention occurs when a government or monetary authority buys or sells currencies to influence an exchange rate. Buying yen increased immediate demand for the currency and signalled that both governments were prepared to resist depreciation.

Intervention changes supply and demand directly in the FX market. This is different from monetary policy. Bank of Japan interest-rate decisions affect returns on yen assets and wider financial conditions.

Why had the yen fallen towards a 40-year low?

Four main factors have kept pressure on the yen:

1. Low Japanese interest rates. Japan kept rates at or below zero for years to combat the low growth and deflation associated with its “Lost Decades”. Although the Bank of Japan rate was around 1% on 31 July 2026, the US range remained at 3.50–3.75%. This gap made dollar assets more attractive, supporting demand for dollars over yen.

   
   

2. Structural pressures and imported energy. Japan’s shrinking working-age population and periods of weak productivity growth have constrained growth. Japan also imports much of its energy and generally pays in foreign currencies. Higher prices increase demand for dollars, while a weaker yen makes those imports more expensive.
   
   

3. Japanese earnings kept overseas. Japanese companies invest heavily abroad. When their overseas profits are reinvested rather than converted into yen, they do not create demand for the currency.
   
   

4. Concerns about fiscal policy and government debt. Investors may become more cautious about the yen when new spending could add to Japan’s already high public debt.

These factors help explain the pressure on the yen, but they do not mean that Japan’s economy is “weak”. In April 2026, the IMF highlighted Japan’s current-account surplus and large stock of net foreign assets.

Why did the United States join Japan?

US participation was unusual: it last joined an operation to strengthen the yen in 1998. In its official statement, Japan said the joint action aimed to counter excessive volatility and disorderly movements. Washington did not publish a detailed explanation of its broader motivations.

1. Limiting wider instability in Asian markets. A disorderly yen fall could pressure other Asian currencies, including the South Korean won, and sharpen concerns about the relative undervaluation of the Chinese yuan. Some analysts see regional stability as one possible motive.
   
   

2. Supporting a major partner. Japan is an important US economic and strategic partner. Helping it stabilise the yen may have served a broader bilateral interest.
   
   

3. Reducing pressure on US Treasury markets. Japan may need to sell US Treasury securities to finance repeated yen purchases. Analysts suggest that direct US support could reduce the amount Japan needs to sell.

These are possible explanations rather than confirmed policy motives. A lasting effect will depend on Japanese monetary and fiscal policy and the forces still affecting the yen. Businesses should watch future Bank of Japan and Federal Reserve decisions, energy prices and whether more overseas income is converted back into yen.

What could a stronger yen mean for Swiss businesses?

The operation took place mainly through USD/JPY, but a Swiss company should focus on the exchange rate affecting its own cash flow. A stronger yen against the dollar does not automatically imply the same move against the Swiss franc.

• Swiss importers paying suppliers in yen may face a higher CHF cost if JPY also strengthens against CHF before payment.
  
  

• Swiss exporters billing Japanese customers in francs may benefit from stronger Japanese purchasing power, although demand depends on more than exchange rates.
  
  

• Companies invoiced in dollars for Japanese goods remain directly exposed to USD/CHF and should not assume that a yen move will change the supplier’s USD price.

Check the current CHF/JPY exchange rate

Use the SwissFx currency calculator to view the latest indicative CHF/JPY rate and estimate a conversion.

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Send

CHF

Receive

EUR

You could save up to*

EUR

*Currency rates used are indicative based on the mid-market rate with example spreads used to demonstrate the difference between an average for Swiss banks vs one typically offered by SwissFx.

This is for informational purposes only and you may get a different rate when exchanging money.

Please contact us for an exact price.

Send

CHF

Receive

EUR

You could save up to*

EUR

*Currency rates used are indicative based on the mid-market rate with example spreads used to demonstrate the difference between an average for Swiss banks vs one typically offered by SwissFx.

This is for informational purposes only and you may get a different rate when exchanging money.

Please contact us for an exact price.

How can a business manage JPY exposure?

 A multi-currency account can help a company hold available yen and separate payment timing from conversion timing. It does not remove exchange-rate risk when JPY must ultimately be converted into CHF.

Where a future amount and date are sufficiently clear, an eligible business may also review an FX risk-management strategy such as a forward contract. This can provide greater certainty, but the agreed rate remains binding if the market later moves favourably. Availability and suitability depend on the client and the underlying commercial exposure.

The objective is not to predict whether intervention will succeed. It is to understand where JPY/CHF movements affect the business and decide how much uncertainty to retain.

This article is for informational purposes only and does not constitute investment, financial or risk-management advice.