Why structure comes first
Before a Fair Value Gap, an order block, or a liquidity sweep, there's market structure. It's the skeleton the whole of SMC trading is built on. Read structure wrong and everything else fails: you trade order blocks in the wrong direction and sweeps that aren't sweeps. Mastering BOS and CHoCH is the prerequisite.
How structure is defined
Structure is built with highs and lows:
- Uptrend: higher highs (HH) and higher lows (HL).
- Downtrend: lower highs (LH) and lower lows (LL).
As long as that sequence holds, the trend is intact. The two events that matter are when that sequence is confirmed (BOS) or broken (CHoCH).
BOS — Break of Structure
A Break of Structure is the continuation of the trend: price breaks the last relevant high (in an uptrend) or the last low (in a downtrend), confirming flow continues in the same direction.
Uptrend: price breaks the last HH → bullish BOS (keeps rising)
Downtrend: price breaks the last LL → bearish BOS (keeps falling)BOS tells you: "the trend continues, look for entries with it".
CHoCH — Change of Character
A Change of Character is the first sign of a reversal: price breaks structure against the prevailing trend. In an uptrend, CHoCH happens when price breaks the last higher low (HL). It's the first warning flow may be changing.
In uptrend: price breaks the last HL → bearish CHoCH (possible reversal)
In downtrend: price breaks the last LH → bullish CHoCH (possible reversal)CHoCH tells you: "watch out, market character has changed, get ready to trade the other side".
The difference in one sentence
BOS = continuation. CHoCH = first reversal. BOS confirms the trend; CHoCH warns it's ending. Confusing them is the costliest mistake in SMC.
How to use them in your trading
- Define bias on a high timeframe (H4/H1) with the sequence of highs and lows.
- Wait for a CHoCH after a liquidity sweep: the sweep + CHoCH combo is the highest-quality reversal signal.
- Trade the order block that originates the new impulse after the CHoCH.
- Use subsequent BOS to manage: each BOS in your favor confirms you're right and you can trail the stop.
The complete SMC flow
Liquidity sweep → CHoCH (reversal) → Order Block + FVG (entry) → BOS (continuation)Each piece links to the next. Go deeper on each: liquidity and sweeps, order blocks, Fair Value Gaps, and the pillar guide on Smart Money Concepts.
Detect them on TradingView
Our BOS + CHoCH indicator automatically detects and labels structure breaks in real time, so you don't have to mark highs and lows by hand. Free on indicators.
Conclusion
Structure is the map; BOS and CHoCH are the traffic signs. BOS = continue, CHoCH = reverse. Master this before any other SMC tool, because everything else — order blocks, FVG, sweeps — only works when you read it on the correct side of structure.