Macro & Central BanksBoJNichigin
Bank of Japan
Japan's central bank, long associated with ultra-loose monetary policy, large-scale asset purchases and yield curve control.
What Bank of Japan means
The Bank of Japan is Japan's central bank, with monetary policy set by its Policy Board at scheduled meetings through the year. After decades of weak growth and persistent deflationary pressure it became the pioneer of unconventional policy, running very low and at times negative short-term rates, buying government bonds and other assets on a large scale, and operating yield curve control, a framework in which the bank commits to keeping a target maturity of government bond yields within a stated range by buying whatever quantity is required to defend it.
This history made the yen the classic funding currency: when Japanese rates sit far below rates elsewhere, investors borrow yen cheaply to buy higher-yielding assets, which weakens the yen while the trade is popular and can unwind violently when it is not. Any hint that yield curve control or the policy rate is being adjusted therefore has outsized effects on USD/JPY and yen crosses. A separate caveat is that currency intervention in Japan is decided by the Ministry of Finance, with the Bank acting as its agent in the market.
Worked example
If the Policy Board widens or abandons a yield curve control band, Japanese long-term yields jump and the yen can strengthen abruptly, with USD/JPY falling from around 152.40 to 148.00 in a session. Illustrative hypothetical.
Related terms
- Interest RateThe price of borrowing money, expressed as a percentage per year, with the central bank's policy rate anchoring the whole structure.
- Carry TradeA strategy of holding a higher-yielding currency against a lower-yielding one to earn the interest differential.
- Currency InterventionOfficial buying or selling of a currency by a central bank or finance ministry to influence its exchange rate.
- Yield CurveA plot of government bond yields across maturities, whose shape summarises market expectations for growth, inflation and policy rates.
- Safe-Haven CurrencyA currency that tends to appreciate during periods of market stress as investors seek to preserve capital.
Frequently asked questions
What does Bank of Japan mean in forex trading?
Japan's central bank, long associated with ultra-loose monetary policy, large-scale asset purchases and yield curve control.
How does Bank of Japan work in practice?
This history made the yen the classic funding currency: when Japanese rates sit far below rates elsewhere, investors borrow yen cheaply to buy higher-yielding assets, which weakens the yen while the trade is popular and can unwind violently when it is not. Any hint that yield curve control or the policy rate is being adjusted therefore has outsized effects on USD/JPY and yen crosses. A separate caveat is that currency intervention in Japan is decided by the Ministry of Finance, with the Bank acting as its agent in the market.
What is an example of Bank of Japan?
If the Policy Board widens or abandons a yield curve control band, Japanese long-term yields jump and the yen can strengthen abruptly, with USD/JPY falling from around 152.40 to 148.00 in a session. Illustrative hypothetical.
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