The Japanese yen is the weakest performer of 16 major currencies over the past 12 months, down about 9.7% in the 2026 strength ranking. The short answer for why: Japan's interest rate is still the lowest in the basket, and the yen has spent years funding other countries' carry trades instead of attracting them.
It's a rate story, not a Japan-crisis story
As of mid-2026, the Bank of Japan's policy rate sits at 0.75% - up from years near zero, but still far below the Federal Reserve (3.50-3.75%), the Reserve Bank of Australia (4.35%), or Hungary's central bank (6.00%). A currency that pays almost nothing to hold gets sold to fund positions in currencies that pay more. That's structurally different from a currency in crisis: nobody is dumping yen because they've lost confidence in Japan, they're borrowing yen because it's cheap, and cheap money gets sold, not bought.
That's exactly the mirror image of the Hungarian forint's run to the top of the ranking (+12.3%) - both moves trace back to the same interest-rate gap, from opposite ends.
The gap is narrowing, slowly
The BOJ raised its policy rate again in June 2026 - part of a slow, multi-year process of moving off near-zero rates. Every hike narrows the gap with the Fed and other majors, which is a headwind for carry trades funded in yen.
This isn't new. The same setup drove August 2024's sharp, brief yen unwind, when a BOJ hike combined with other central banks pausing narrowed the gap fast enough that crowded carry trades had to close all at once, and the yen spiked. The 2026 pattern is similar in direction but slower: the BOJ is still hiking, the Fed is holding rather than cutting, but the gap remains wide enough that carry trades keep getting rebuilt in the yen even as it periodically firms up on hike days.
What would actually turn the yen around
A sustained yen recovery needs the rate gap to close meaningfully, not just narrow at the margins. That means either the BOJ hiking faster than markets currently expect, or the Fed and other high-rate central banks cutting while Japan holds or keeps raising. Until one of those happens, the structural incentive - borrow yen, invest in something that pays more - stays in place, and the yen tends to drift down between the occasional hike-driven bounce.
None of this is a signal to trade anything - carry-trade unwinds are exactly the kind of move that's obvious in hindsight and dangerous to time. Treat the rate gap as context for why the yen moves the way it does, not a trading strategy.
How to watch it
- Track the BOJ-Fed rate gap, not just USD/JPY. The gap is the actual driver; the exchange rate is the symptom.
- Watch for a sharp, fast yen move rather than a gradual one - that's the signature of a carry-trade unwind, not a fundamental shift.
- Compare the yen against the whole basket on the worldwide dashboard, not just the dollar - a JPY move that's isolated to USD/JPY tells a different story than one that shows up against all 16 currencies at once.
Compare the yen directly: USD vs JPY, EUR vs JPY, or HUF vs JPY.
This article is informational, not investment advice.