Before you can identify an order block, spot a liquidity sweep, or use a Fair Value Gap as an entry — you need to understand market structure. Market structure tells you the direction of the trend and when that trend may be reversing. Without it, every other ICT concept loses its context.
Two concepts define ICT market structure: Break of Structure (BOS) and Change of Character (CHoCH). They sound similar but serve completely different purposes. Confusing the two is one of the most common reasons traders take setups in the wrong direction.
What is market structure?
Market structure describes how price moves in a series of swing highs and swing lows. A bullish market structure consists of higher highs (HH) and higher lows (HL) — each new high is higher than the previous one, and each pullback finds support above the last low. A bearish market structure consists of lower lows (LL) and lower highs (LH).
- Bullish: HH → HL → HH → HL — trend is up
- Bearish: LH → LL → LH → LL — trend is down
- Ranging: equal highs and equal lows — no clear direction, liquidity is accumulating
Always determine the HTF market structure first — on the 4H or 1H chart. This gives you the bias (bullish or bearish) for the day. Only then drop to a lower timeframe to look for entries in that direction. Never trade a 5m CHoCH against a 4H bullish structure.
What is a Break of Structure (BOS)?
A Break of Structure is a continuation signal. It occurs when price breaks through a previous swing high (in a bullish trend) or a previous swing low (in a bearish trend) — confirming that the current trend is still intact.
- Bullish BOS: price closes above a previous HH → trend confirmed upward
- Bearish BOS: price closes below a previous LL → trend confirmed downward
A BOS tells you: the trend is continuing. It does not signal a reversal. In a bullish run with multiple BOS signals, you are looking for longs on pullbacks — not shorts.
What is a Change of Character (CHoCH)?
A Change of Character is a reversal signal. In a bullish trend, a CHoCH occurs when price for the first time breaks below a previous swing low — the first sign that the uptrend may be ending. In a bearish trend, a CHoCH is the first break above a previous swing high.
- Bullish CHoCH: in a bearish trend, price breaks above a previous LH → potential reversal upward
- Bearish CHoCH: in a bullish trend, price breaks below a previous HL → potential reversal downward
The CHoCH is the earliest signal of a potential trend reversal. It doesn't mean the trend has definitively changed — it means you should start paying attention to potential reversal setups.
BOS vs CHoCH — the key difference
| Aspect | BOS | CHoCH |
|---|---|---|
| Meaning | Trend continuation | Potential trend reversal |
| In bullish trend | Breaks above previous HH | Breaks below previous HL (first time) |
| In bearish trend | Breaks below previous LL | Breaks above previous LH (first time) |
| Signal type | Look for continuation entries | Start watching for reversal setups |
| Reliability | High — trend is confirmed | Medium — first sign, wait for confirmation |
Multi-timeframe use
The strength of BOS and CHoCH depends heavily on the timeframe. A CHoCH on the 4H is a much stronger signal than one on the 5m. The classic ICT multi-timeframe approach:
- 4H: determine overall trend (BOS sequence = higher highs and higher lows)
- 1H: find where the 4H correction ends — look for a CHoCH that marks the end of the pullback
- 5m: refine entry — look for a smaller CHoCH as the precise entry trigger after a liquidity sweep
BOS/CHoCH in a complete ICT setup
Common mistakes
- Treating every CHoCH as a definitive reversal: a CHoCH is the first sign, not confirmation. Wait for a displacement candle and structure shift before entering.
- Trading CHoCH without HTF context: a 5m CHoCH against the 4H trend is noise, not a setup. HTF structure always wins.
- Confusing BOS with CHoCH: if price is making higher highs and breaks above a previous high — that's a BOS, not a CHoCH. It means continuation, not reversal.
- Entering at the CHoCH candle itself: the entry is at the OB or FVG after the CHoCH, not at the CHoCH candle. Entering at the CHoCH gives you a poor risk-reward and no buffer.
Read also: What is ICT Trading? · What is a Liquidity Sweep? · What is an Order Block?