Break of Structure vs Change of Character (BOS vs CHoCH)

Once you can mark swing highs and lows, the next skill is telling apart the two kinds of breaks you will see every day. Some breaks say the trend is alive and well. Others are the first crack in it. Mixing them up is one of the fastest ways to flip your bias at the wrong moment.

This lesson builds on ICT Market Structure and focuses on one question: is this break a break of structure (BOS) or a change of character (CHoCH)?

What it is

Break of structure (BOS)

A BOS is a break of a swing point in the direction of the existing trend.

• In an uptrend, price takes out the most recent swing high and makes a higher high.
• In a downtrend, price takes out the most recent swing low and makes a lower low.

A BOS is a continuation signal. It does not tell you to enter; it tells you the current leg is still working and that the swing which produced the break is now worth watching.

Change of character (CHoCH)

A CHoCH is the first break against the trend.

• In an uptrend, price breaks below the last higher low, the low that "protected" the move up.
• In a downtrend, price breaks above the last lower high.

A CHoCH is an early reversal signal. It does not prove the trend is over. It says the pattern of higher lows (or lower highs) has been interrupted for the first time.

Where MSS fits

The term CHoCH is most common in smart-money concepts (SMC) teaching. Many ICT traders use market structure shift (MSS) for the same event, and some reserve MSS specifically for a CHoCH made with strong displacement. This course treats them as close relatives; the Displacement and Market Structure Shift lesson covers why the quality of the move matters.

Close or wick?

Educators disagree about what confirms a break. A body-close rule requires a candle to close beyond the swing point. A wick rule accepts any trade beyond it. Body closes filter out many false breaks but confirm later. Wicks confirm sooner but often catch liquidity sweeps that reverse immediately. Neither is correct by default. Choose one, write it down and test it.

How to identify it

1. Pick one timeframe and say it out loud. "On the 1-hour chart" matters, because a CHoCH on the 5-minute chart may be a normal pullback on the 4-hour chart.
2. Label the swings. Mark each swing high and low as HH, HL, LH or LL.
3. Define the trend. Higher highs and higher lows is bullish; lower highs and lower lows is bearish.
4. Mark two lines. One at the swing the trend needs to break to continue (the BOS line) and one at the swing that protects the trend (the CHoCH line).
5. Apply your confirmation rule. Close or wick, the same rule every time.
6. Label the break. With the trend is a BOS; against the trend is a CHoCH.
7. Check the context. Was liquidity taken before the CHoCH? Was the move made with displacement? Both add weight.
8. Update both lines after every new swing.

Worked example: a CHoCH on EUR/USD

Prices are illustrative, on a 1-hour EUR/USD chart.

Price falls from 1.0960 to 1.0900, retraces to 1.0935 (a lower high) and then closes at 1.0892, 8 pips below the 1.0900 low. That is a BOS: the downtrend continues. It extends to 1.0870 and pulls back to 1.0915, the new lower high.

Next, price dips to 1.0864, 6 pips under the 1.0870 low, but the candle closes at 1.0874, back above it. Under a body-close rule this is not a BOS; it looks more like a sweep of the sell stops below 1.0870. Under a wick rule it would have been labelled a BOS, which shows why the rule matters.

Price then rallies hard and closes at 1.0922, 7 pips above the 1.0915 lower high. That is the CHoCH: the first time the downtrend has failed to protect a lower high. Because it came straight after the sweep and with large-bodied candles, many ICT traders would also call it an MSS.

The rally leaves a bullish fair value gap between 1.0889 and 1.0898. A trader who wants to act on the CHoCH might place a buy limit at 1.0895, with a stop-loss at 1.0859, 5 pips below the sweep low. That is 36 pips of risk. A first target at the 1.0935 lower high is 40 pips away, and the 1.0960 swing high is 65 pips away, about 1:1.8.

Position size on a $10,000 account risking 1% ($100), at roughly $10 per pip per standard lot: $100 ÷ (36 × $10) ≈ 0.28 lots. The Position Size Calculator handles this for you. If price closes back below 1.0864, the CHoCH has failed and the stop does its job.

How traders use it

• BOS for continuation trades. After a BOS, traders wait for a pullback into a discount (or premium) area and trade with the trend rather than chasing the break.
• CHoCH as a warning first, a trigger second. A CHoCH against a strong higher-timeframe trend is often used to stop adding to positions or to tighten management, not to reverse immediately.
• CHoCH plus context as an entry. A CHoCH after a liquidity sweep, made with displacement and in line with the higher-timeframe bias, is the core trigger in many ICT models.
• Earlier signals. Some traders watch a change in state of delivery (CISD), which can appear before the CHoCH.

Any break can fail. Keep risk per trade small and know in advance which price proves the idea wrong.

Common mistakes

• Labeling the wrong swing. A CHoCH breaks the swing that protected the trend, not just any small internal low.
• Mixing timeframes. Calling a 5-minute CHoCH a reversal of the daily trend.
• Switching rules mid-trade. Using wicks when it suits you and closes when it does not.
• Treating every CHoCH as a reversal. Many are just deeper pullbacks; the next BOS in the old direction can come quickly.
• Forgetting to update lines. After each new swing, the BOS and CHoCH levels move.

Summary

A BOS breaks a swing in the direction of the trend and signals continuation. A CHoCH is the first break against the trend and is an early, unconfirmed sign of reversal; many ICT traders call it an MSS, especially when it comes with displacement. Mark the BOS line and the protecting swing on one named timeframe, use a single close-or-wick rule, and give more weight to a CHoCH that follows a sweep and aligns with higher-timeframe bias. Then define your stop and size before acting on either signal.