Recently, I’ve been looking at the trend chart for the Japanese yen exchange rate and noticed a pretty interesting phenomenon. Ten years ago, the yen was still seen as a safe haven—but now it has fallen to a historical low. So what exactly is going on behind the scenes?

Speaking of which, the end of 2012 was a turning point. Back then, the yen against the U.S. dollar was still holding around the 80 level. But the moment Shinzo Abe came to power, he started playing the economic playbook, and the Bank of Japan followed suit by going all in—launching large-scale purchases of bonds and ETFs, pouring in a currency amount equivalent to $1.4 trillion within two years. On the surface, the stock market rose, but during this process, the yen depreciated by nearly 30%.

By 2016, the yen’s exchange rate saw a rebound, briefly reaching around 100-101. That year, the Bank of Japan implemented negative interest rates, and the global economy looked less than great—Brexit happened, and everyone rushed into the yen, a traditional safe-haven asset—giving the yen a chance to catch its breath.

But that was just a fleeting moment. The real story began after 2021. The Federal Reserve started tightening policy, with U.S. interest rates rising, while the Bank of Japan kept insisting on an easing stance—causing the interest rate differential to widen further and further. Investors realized that borrowing yen was extremely cheap, and they could use it to buy dollar-denominated assets to earn the interest-rate spread. Once these arbitrage trades piled in, the yen had no way to fight back.

2024 became a watershed. In March and July, the Bank of Japan raised interest rates twice, bringing them up to 0.25%, which looked like it might be heading toward normalization. So what happened? The yen’s exchange rate didn’t reverse—it instead fell to a new historical low of 161-162 in July. Why? Because the Federal Reserve’s interest rates are still above 5%, and with that spread in place, the yen can’t really turn around. On top of that, the Russia-Ukraine war pushed up energy prices, and as a major resource-importing country, Japan’s trade deficit kept growing—adding even more pressure on the yen to weaken.

By 2025, things became even more complicated. Early in the year, the Bank of Japan raised rates to 0.5%, while the Federal Reserve started cutting rates—at one point, this led to a sharp yen rebound, with the U.S. dollar to yen falling from 158 to around 140. But this move higher was essentially a short-term reaction to the “narrowing interest differential,” not a sign that Japan’s economy had truly improved.

Then things flipped again in the second half of the year. The new U.S. administration’s tariff policy, tax cuts, and fiscal expansion were interpreted by the market as measures that would push inflation higher, which helped support the U.S. dollar index. At the same time, Japan’s new prime minister continued the big-spending approach, and the market began to worry about Japan’s fiscal sustainability. Even though the Bank of Japan raised rates to 0.75% in December—its highest level since 1995—the market’s response was lukewarm. Instead, it felt like the central bank was switching between the accelerator and the brake. In the end, the yen’s exchange rate returned to the 155-158 range, and it even hit a ten-year low.

To be honest, the yen’s problems aren’t just about monetary policy. Structural issues—high debt, low growth, population aging, and heavy reliance on imported energy—are all still there. The market has remained bearish on the yen over the long term. Now that the yen is at a historical low, there may be trading opportunities in theory, but it depends on how the central banks of the U.S. and Japan move next. If U.S. inflation keeps heating up and the Fed has to keep raising rates, the room for a yen rebound is limited. Conversely, if the U.S. economy slows down and the Bank of Japan remains steadfast in raising rates, the yen might have a chance to turn things around.

Overall, the future direction of the yen exchange rate hinges on how much the U.S. and Japan policies diverge. Right now, at historical lows, there really could be some trading opportunities—but the risks are also not small. Forex trading is inherently volatile, so risk management is still essential.