Why is the yen so sensitive to US yields?

With Japanese rates near zero for years, USD/JPY has been driven largely by the gap between US and Japanese interest rates. When US yields rise, the dollar's carry advantage over the yen widens.

What is a carry trade?

Borrowing in a low-yield currency like the yen to invest in higher-yielding assets. Large yen-funded carry trades make the yen sensitive to risk sentiment and rate differentials.

Does Japan intervene in the yen?

Japan's Ministry of Finance can direct the BoJ to buy or sell yen in the market. The risk of intervention tends to cap sharp yen weakness.

Bank of Japan

BoJ · Japan · JPY

The Bank of Japan sets Japanese monetary policy and is pivotal for the yen and global carry trades.

The Bank of Japan (BoJ) spent decades fighting deflation with ultra-loose policy, including negative interest rates and yield-curve control. Its gradual normalization away from those tools has been one of the most consequential macro stories for the yen and for global carry trades that funded in cheap yen to invest in higher-yielding assets elsewhere.

Because Japanese rates sat near zero for so long, the yen's value has been dominated by the interest-rate differential against the US dollar and other higher-yielders. Shifts in BoJ guidance — and the risk of foreign-exchange intervention by Japan's Ministry of Finance when the yen weakens sharply — make the yen unusually sensitive to policy signals.

Policy rate

Policy Rate (uncollateralised overnight call rate)

Meeting cadence

The Policy Board holds eight monetary policy meetings a year, with an Outlook Report (quarterly) and a press conference.

Decision-making

The Policy Board consists of the Governor, two deputy governors, and six other members. Decisions are by majority vote.

Currency

JPY

Mandate

Price stability — a 2% inflation target
Contributing to the sound development of the national economy and financial-system stability

How it moves JPY

Any step in policy normalization repriced the yen sharply after years of near-zero rates.
The US–Japan rate differential is the dominant driver of USD/JPY.
Yen funding makes the currency central to global carry trades and risk sentiment.
MoF intervention risk caps extreme yen weakness and adds two-way volatility.

What to watch

Policy rate & guidance
Steps away from ultra-loose policy move the yen disproportionately.
Outlook Report
Quarterly inflation and growth projections framing normalization.
Intervention signals
Verbal warnings from Japanese officials when the yen weakens quickly.
US Treasury yields
The other side of the USD/JPY rate differential.

BoJ FAQ

Why is the yen so sensitive to US yields?: With Japanese rates near zero for years, USD/JPY has been driven largely by the gap between US and Japanese interest rates. When US yields rise, the dollar's carry advantage over the yen widens.
What is a carry trade?: Borrowing in a low-yield currency like the yen to invest in higher-yielding assets. Large yen-funded carry trades make the yen sensitive to risk sentiment and rate differentials.
Does Japan intervene in the yen?: Japan's Ministry of Finance can direct the BoJ to buy or sell yen in the market. The risk of intervention tends to cap sharp yen weakness.

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