In early August 2026, the United States and Japan carried out a rare joint currency intervention, the first such action since 1998. U.S. Treasury Secretary Scott Bessent said the United States sold euros and bought yen, while Japan’s Ministry of Finance sold dollars for yen. The coordinated action was aimed at stemming the yen’s sharp decline.
The yen had weakened significantly, losing about 59 per cent of its value against the U.S. dollar since 2017 and at one point nearing 163 yen per dollar, its lowest level in 40 years. Analysts have attributed much of the decline to the wide interest rate gap between Japan and the United States. The Bank of Japan held its policy rate around 1.0 per cent, compared with 3.5 to 3.75 per cent for the Federal Reserve. The gap encouraged investors to borrow yen at relatively low rates and invest in higher-yielding assets elsewhere, a practice known as the carry trade.
Estimates of the intervention’s size vary widely. Some reports put the total near $35 billion, while others estimate that Japan alone spent about $75 billion, with the United States contributing a smaller amount. The yen strengthened following the intervention, moving from about 163 to below 157 per U.S. dollar before drifting back toward 158.
Experts called the intervention unusual. The United States rarely participates directly in currency operations. Previous interventions in 2000 and 2011 involved broader coordination with the Group of Seven nations and the Federal Reserve. This time, the Fed was not directly involved. Analysts at the Council on Foreign Relations suggested that the United States acted partly to protect its own economic interests. A weak yen can divert investment toward Asia and away from U.S. manufacturing, while a potential increase in Japanese interest rates could prompt Japanese investors to sell U.S. Treasuries and repatriate their funds.
What was unusual was the Bank of Japan’s use of the Federal Reserve’s Foreign and International Monetary Authorities Repo Facility. The facility allows foreign central banks to use U.S. Treasury holdings as collateral to access dollars rather than selling them on the open market, which would push U.S. Treasury yields higher. Japan holds more than $1.1 trillion in U.S. Treasury securities. If Japan had sold large amounts of Treasuries to buy yen, it could have put significant upward pressure on U.S. yields. The joint action likely helped ease that pressure.
Outlook for U.S. Bond Yields
Looking ahead, most analysts expect the intervention’s effects to fade. Without a meaningful increase in the Bank of Japan’s policy rate, the yen could weaken again, potentially toward 170 per U.S. dollar by 2027. Renewed yen weakness could encourage Japanese investors to shift capital and, if that leads to further selling of U.S. Treasuries, put upward pressure on U.S. bond yields.
That matters for Canada because global bond markets are interconnected. Higher U.S. yields can put upward pressure on Canadian bond yields, which influence fixed mortgage rates. Higher mortgage rates increase borrowing costs and reduce purchasing power, adding to the affordability challenges facing Canadian homebuyers.
For investors, borrowers and analysts focused on housing affordability, the key question is whether Japan’s monetary policy and capital flows create sustained pressure on global bond yields — specifically, whether Japan raises interest rates and continues to hold, rather than sell, its U.S. Treasuries. What begins with the yen can ultimately work its way through global bond markets, putting pressure on Canadian bond yields and fixed mortgage rates and, ultimately, affecting the cost of borrowing for Canadian households.
Independent Opinion
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