Bank of Japan meetings and the overnight yen jump
Posted: Fri Oct 30, 2026 2:47 pm
Bank of Japan meetings and the overnight yen jump
When the Bank of Japan holds its policy meetings, the decision lands in the Tokyo midday, which can be the late evening or the middle of the night elsewhere. The yen's reaction is often more extreme than the headline justifies.
The reason is positioning. The yen is heavily traded as a funding currency, and many participants hold large positions that depend on the BoJ staying patient. A small change in tone can trigger a rush to unwind them.
A 100 pip move in USDJPY within minutes is not unusual. And because the decision falls during a thin market for many traders, the move can extend well beyond what the news would suggest.
Another feature is the delay. The BoJ decision isn't released at a fixed time, because it depends on when the meeting ends. The market waits in a nervous silence, spreads widening, until the headline hits.
Scalping around it is dangerous. The wait can last an hour, with no way to know when the release will come, and the danger of being in the wrong position when it does.
A practical way to prepare is to read the meeting schedule published by the Bank of Japan a year in advance, note the two-day meeting dates, and set a calendar alert for the period when the announcement is likely. The announcement tends to come between late morning and mid-afternoon Tokyo time on the second day, with the wide window explaining the nervous waiting.
Past meetings also show that the biggest moves come when expectations were firm and the outcome departed from them, such as an unexpected adjustment to yield curve policy. A scalper can examine the last few meetings' tick data to see how spreads behaved in the hour before and after. The shapes usually look more alarming than the daily candles suggest.
How does the strategy cope with not knowing when the BoJ announcement will land?
When the Bank of Japan holds its policy meetings, the decision lands in the Tokyo midday, which can be the late evening or the middle of the night elsewhere. The yen's reaction is often more extreme than the headline justifies.
The reason is positioning. The yen is heavily traded as a funding currency, and many participants hold large positions that depend on the BoJ staying patient. A small change in tone can trigger a rush to unwind them.
A 100 pip move in USDJPY within minutes is not unusual. And because the decision falls during a thin market for many traders, the move can extend well beyond what the news would suggest.
Another feature is the delay. The BoJ decision isn't released at a fixed time, because it depends on when the meeting ends. The market waits in a nervous silence, spreads widening, until the headline hits.
Scalping around it is dangerous. The wait can last an hour, with no way to know when the release will come, and the danger of being in the wrong position when it does.
A practical way to prepare is to read the meeting schedule published by the Bank of Japan a year in advance, note the two-day meeting dates, and set a calendar alert for the period when the announcement is likely. The announcement tends to come between late morning and mid-afternoon Tokyo time on the second day, with the wide window explaining the nervous waiting.
Past meetings also show that the biggest moves come when expectations were firm and the outcome departed from them, such as an unexpected adjustment to yield curve policy. A scalper can examine the last few meetings' tick data to see how spreads behaved in the hour before and after. The shapes usually look more alarming than the daily candles suggest.
How does the strategy cope with not knowing when the BoJ announcement will land?