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Tokyo, September 19, 2026 – The Japanese yen weakened to nearly 158 against the U.S. dollar this week, even after the Bank of Japan raised its policy rate to 1.25 percent the highest level in 31 years.
The move, intended to stabilize the currency and signal confidence in Japan’s economy, has instead highlighted the difficulty of narrowing the wide gap between Japanese and American interest rates.
On September 18, the BOJ lifted its benchmark rate by 25 basis points.
The decision was not unanimous, with two board members dissenting, underscoring internal divisions over tightening policy amid fragile domestic demand.
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Inflation remained modest at 1.7 percent in August, still below the central bank’s 2 percent target.
Markets responded with skepticism. The yen fell 1.2 percent to 157.98 per dollar, its weakest in two weeks.
Japanese equities rallied, with the Nikkei 225 climbing 1.5 percent, as investors interpreted the hike as a sign of confidence in corporate earnings.
Bond yields slipped, reflecting doubts that the BOJ will sustain a faster pace of tightening.
Analysts argue the rate hike was largely anticipated, offering little support to the currency.
The U.S. Federal Reserve’s benchmark rate remains in the 3.75 to 4 percent range, leaving a wide gap that continues to favor dollar assets.
“Unless the BOJ signals a more aggressive path, the yen will remain under pressure,” said one Tokyo based strategist.
The credibility of the BOJ’s stance is also in question.
The split vote has raised doubts about policy unity, weakening investor confidence.
Japan’s Finance Ministry has hinted at possible intervention should the yen’s slide deepen, though such measures are typically short lived without fundamental shifts in monetary policy.
Global factors compound the challenge. Elevated U.S. bond yields continue to draw capital away from Japan, while rising oil prices threaten to erode Japan’s trade balance.
For now, traders remain cautious, watching BOJ signals and U.S. economic data for direction.
The bottom line Japan’s historic rate hike has failed to meaningfully support its currency.
Analysts stress that only faster tightening or a narrowing of the U.S. Japan interest rate gap could reverse the yen’s weakness.
Until then, the yen’s vulnerability underscores the limits of monetary policy in the face of global financial currents.
