Break of Structure and Market Shift Signals
A break of structure (BOS) is the market's way of telegraphing a potential shift in control between buyers and sellers.
What Is a Break of Structure?
In an uptrend (sequence of HH/HL), a break of structure occurs when price breaks and closes below the most recent higher low. This is the market's first signal that the prevailing trend may be changing. It does not confirm a reversal, but it demands caution and shifts the probability assessment.
Internal vs External Structure Breaks
Not all BOS signals are equal. An internal structure break occurs on a minor swing point — a pullback low within the trend that may be a liquidity grab rather than a genuine shift. An external structure break occurs at a major swing low — the kind of level that, if broken, signals a genuine change in market character.
Change of Character (ChoCh)
A Change of Character (ChoCh) is confirmed when: (1) a structural break occurs, and (2) price then fails to make a new high in the direction of the prior trend. For example, in a prior uptrend, price breaks below the last HL (BOS), then makes a new swing high that fails to exceed the last HH. This double confirmation suggests the trend has genuinely reversed.
Trading BOS Signals
BOS signals are not direct trade entries — they are contextual signals that tell you to look for entries in the new direction. After a bearish BOS, traders wait for a corrective pullback (retracement) before entering short. The pullback into a former support-turned-resistance is where the short entry is sought, not at the BOS candle itself.