Why the Yen Keeps Falling Even as the Bank of Japan Turns Hawkish

The Yen recently touched its weakest level against the Dollar in roughly 40 years, even as the Bank of Japan holds its policy rate at 1.00% and signals more hikes are coming. That combination — a central bank tightening while its currency keeps sliding — is the story of a fiscal and monetary policy tug-of-war playing out in Tokyo right now, one directly connected to the joint US-Japan intervention covered in our earlier FIMA and ESF pieces.

Table of Contents

• The BOJ's Hawkish Hold
• Fiscal Policy Pulling the Other Direction
• A Board Split Between Hawks and Doves
• Why Intervention Alone Hasn't Been Enough
• Implications for Korea
• Bottom Line

The BOJ's Hawkish Hold

At its July 31, 2026 meeting, the Bank of Japan held its policy rate steady at 1.00%, a decision widely expected by markets. What mattered more was Governor Kazuo Ueda's language afterward: Ueda stated the BOJ "will not fall behind the curve" on rate policy, and warned that delaying necessary tightening could let inflation risks materialize and damage the economy. The BOJ's quarterly Outlook Report projected core CPI inflation accelerating to a level "clearly above" 2% starting in the second half of fiscal 2026. Board member Hajime Takata dissented, calling for an immediate hike to 1.25%. Market pricing currently points to at least one additional 25 basis point hike before year-end, with expectations split between the October and December meetings — though a September 17-18 meeting is also on the calendar and being watched closely.

A 40-Year Low: Inside the BOJ's Fiscal-Monetary Tug-of-War

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Fiscal Policy Pulling the Other Direction

While the BOJ leans hawkish, Japan's fiscal policy stance under Prime Minister Sanae Takaichi has generally been read by markets as supportive of continued economic stimulus — a policy mix that tends to work against currency strength even as interest rates rise. This fiscal-monetary tension is a familiar dynamic in Japan: tighter monetary policy alone has historically struggled to support the Yen when fiscal policy simultaneously pushes in the opposite direction, since looser fiscal policy raises the risk of sustained twin deficits and long-run currency depreciation pressure, even in the face of higher rates.

A Board Split Between Hawks and Doves

The BOJ's policy board itself reflects this tension. Newer board member Ayano Sato, an appointee aligned with the Takaichi government, has signaled a more accommodative tilt, stating Japan's inflation picture isn't yet strong enough to justify aggressive tightening. This creates a genuinely divided board — hawks like Takata pushing for faster hikes against inflation risk, and more dovish appointees favoring caution — leaving Ueda's public communication as the key signal markets watch at each meeting, since a single word choice can move the Yen sharply within minutes.

Why Intervention Alone Hasn't Been Enough

As covered in our earlier pieces on the FIMA Repo Facility and the Exchange Stabilization Fund, Japan and the US conducted a joint Yen-buying intervention in late July 2026. The results have been mixed: the intervention provided only temporary relief, with the Yen's underlying weakening trend resuming within days — a pattern that also followed a previous intervention attempt in April. US Treasury Secretary Scott Bessent has since suggested part of Japan's inflation problem traces directly to Yen weakness and elevated energy prices, and has pushed publicly for BOJ rate hikes, remarks that market participants read as raising the odds of tightening at the September meeting. Bessent has also noted that several other Asian currencies, including the Korean Won, tend to track Yen weakness — meaning Japan's currency dynamics carry direct spillover effects across the region.

Implications for Korea

A structurally weak Yen creates two-sided pressure for Korean markets. On one hand, as our earlier coverage of the Won's rally noted, a narrowing US-Korea rate differential has been a Won-supportive factor independent of Japan. On the other, persistent Yen weakness pulls on the Won directly through regional currency correlation, and creates competitive pressure for Korean exporters competing with Japanese manufacturers on price. Whether the BOJ's hawkish signaling translates into actual sustained Yen strength — or gets undercut again by fiscal policy and dovish board dissent — is likely to remain a recurring variable for Won direction through the rest of 2026.

Bottom Line

The Yen's slide to a roughly 40-year low against the Dollar, even as the Bank of Japan signals further tightening, reflects a genuine tug-of-war between hawkish monetary policy and a more accommodative fiscal stance, playing out on a policy board itself split between hawks and dovish new appointees. A late-July joint US-Japan intervention offered only temporary relief. Because several regional currencies, including the Korean Won, tend to track Yen direction, this tension is likely to remain a factor Korean market watchers need to track through the BOJ's next meetings.

This article is for informational purposes only and does not constitute investment, tax, or legal advice. Readers should consult a licensed professional before making investment decisions.