Break of Structure and Change of Character: Reading Market Shifts
BOS and CHoCH are how SMC traders define trend continuation and trend reversal. They replace subjective terms like 'the trend looks like it's turning' with specific, objective events in price structure — a break of a defined level.
Price does not move in a straight line. It swings — making peaks and troughs as buyers and sellers battle for control. These peaks and troughs are not random. They tell a story. When price makes a higher peak than the last one, buyers are in control. When it makes a lower trough, sellers are pushing. Break of Structure and Change of Character are the SMC tools for reading this story precisely — without guesswork.
BOS: each new Higher High breaks prior structure — trend continues. CHoCH: first Lower Low in an uptrend — potential reversal.
Market Structure: The Foundation
Before understanding BOS and CHoCH, you need to understand the basic building blocks of market structure:
- Swing High (SH) — a candle with a higher high than both the candle before it and the candle after it. A local peak.
- Swing Low (SL) — a candle with a lower low than both the candle before it and the candle after it. A local trough.
- Uptrend — a series of Higher Highs (HH) and Higher Lows (HL). Each peak exceeds the last. Each trough stays above the last.
- Downtrend — a series of Lower Highs (LH) and Lower Lows (LL). Each peak is lower than the last. Each trough is lower too.
Structure Is Just Swing Highs and Swing Lows
Strip away every indicator and overlay. What remains are the swing highs and lows price has printed. These are the only reference points BOS and CHoCH use. Mark your last significant swing high and swing low — those are your structural levels.
Break of Structure (BOS)
A BOS confirms that the current trend is intact and continuing. It happens when price breaks through a swing point in the direction of the prevailing trend.
- In an uptrend: a BOS occurs when price breaks above the most recent swing high. Higher High confirmed. Trend continues.
- In a downtrend: a BOS occurs when price breaks below the most recent swing low. Lower Low confirmed. Trend continues.
BOS in an Uptrend
Price is in an uptrend, making higher highs and higher lows. The last swing high was $110. Price pulls back to $104 (forming a higher low), then rallies again. When price closes above $110, that is a BOS — trend continuation confirmed. The next move is expected to push higher. Traders use the pullback to $104 as an entry opportunity.
Change of Character (CHoCH)
A CHoCH is the first signal that the market's character is changing — that the prevailing trend may be ending. It is a break in the opposite direction to the trend.
- In an uptrend: a CHoCH occurs when price breaks below the most recent Higher Low — the opposite structural point. This is the first sign buyers are losing control.
- In a downtrend: a CHoCH occurs when price breaks above the most recent Lower High — the first sign sellers are losing control.
CHoCH in an Uptrend
Price has been making higher highs and higher lows. The last higher low was at $104. Price makes another high at $112 but then starts falling — and breaks below $104. That is a CHoCH. The uptrend's structure has been violated. The market has changed character. Traders watch for a new lower high to form, which would confirm the reversal into a downtrend.
BOS vs CHoCH: The Core Difference
| Break of Structure (BOS) | Change of Character (CHoCH) | |
|---|---|---|
| What breaks | A swing point in the direction of the trend | A swing point against the direction of the trend |
| Signal | Trend continuation | Potential trend reversal |
| In an uptrend | Price breaks above the last swing high | Price breaks below the last higher low |
| In a downtrend | Price breaks below the last swing low | Price breaks above the last lower high |
| Trader response | Look for pullback entries in trend direction | Stop looking for trend trades — watch for reversal setup |
| Confirmation needed? | BOS alone confirms continuation | CHoCH is warning — wait for new structure to confirm |
From CHoCH to New Trend: The Full Sequence
A full trend reversal follows a predictable sequence in SMC:
- Uptrend in place — series of HH and HL
- A CHoCH forms — price breaks below the last HL
- Price rallies but fails to make a new HH — forms a Lower High instead
- Price then breaks below the CHoCH low — first BOS of the new downtrend
- Downtrend is now confirmed — new series of LH and LL begins
The CHoCH Is Your Early Warning. The BOS Is Your Confirmation.
Many traders enter on a CHoCH anticipating the reversal. This is aggressive — the move may only be a retracement, not a full reversal. A more conservative approach: wait for the CHoCH to form, then wait for the first BOS of the new structure. You miss the very first part of the reversal but you trade with far more confirmation.
Identifying the Best BOS and CHoCH Levels
Not every swing high and low carries equal weight. The strongest BOS and CHoCH events involve:
- Significant swing points — peaks and troughs that held for multiple sessions, not minor intraday wiggles
- Clean, impulsive breaks — a strong candle closing decisively through the level, not a slow grind
- Confluence with other SMC elements — the break aligns with a liquidity sweep, an order block, or an FVG
- Higher timeframe alignment — a CHoCH on the 4H chart carries far more weight than one on the 5M chart
Minor Swing Points Create False BOS Signals Constantly
If you mark every tiny peak and trough, you will see BOS signals every few candles and CHoCH signals almost as often. The key is to focus on significant structural swings — the ones that represent a meaningful move, not a single candle's fluctuation. Use the 1H or 4H chart to identify the structure you actually care about.
Key Takeaways
- Market structure is defined by swing highs and swing lows — the peaks and troughs price creates as it moves.
- A Break of Structure (BOS) is when price breaks a previous swing high (in an uptrend) or swing low (in a downtrend) — confirming trend continuation.
- A Change of Character (CHoCH) is when price breaks the opposing swing — a swing low in an uptrend, or a swing high in a downtrend — signalling a potential reversal.
- BOS = continuation. CHoCH = reversal warning.
- Every new trend begins with a CHoCH. Every trend continuation is marked by a BOS.