Two phrases appear constantly in Smart Money Concepts material: break of structure (BOS) and change of character (CHoCH). Beginners often use them as if they meant the same thing. They do not. This article defines both, shows how they differ, and explains why neither one is a guarantee.

Break of structure (BOS)

A break of structure happens when price closes beyond a swing point in the direction of the existing trend. In an uptrend, a BOS occurs when price closes above the previous swing high. In a downtrend, it occurs when price closes below the previous swing low.

A BOS is read as continuation: the trend made a new extreme and the structure remains intact.

Change of character (CHoCH)

A change of character is the first break against the existing trend. In an uptrend, it is a close below the most recent higher low, the swing that was supporting the sequence. In a downtrend, it is a close above the most recent lower high.

A CHoCH is read as a warning that the pattern may be changing. It does not confirm a reversal. It only says that the sequence of higher lows (or lower highs) has been interrupted.

Side by side

  • Direction: BOS is with the trend. CHoCH is against it.
  • Message: BOS suggests continuation. CHoCH suggests the trend is being challenged.
  • Reference swing: BOS uses the swing high or low that the trend just made. CHoCH uses the swing that was protecting the trend.

Wick or close?

Traders disagree on whether a wick through a level counts. Many require a candle close beyond the level, because wicks are frequently the result of liquidity being taken rather than a genuine shift. Whichever rule you choose, write it down and apply it the same way every time, including when testing.

Why context matters

A CHoCH on a one-minute chart inside a strong daily uptrend is often just a pullback. The same CHoCH on the daily chart carries much more weight. Always ask which timeframe's structure you are describing and what the higher timeframe is doing.

A worked reading

Imagine price in an uptrend: it rises to a high, pulls back to a low, then rises to a new high (a BOS). It pulls back again to a higher low. Later, it closes below that higher low. That close is a CHoCH. From there, a careful reader waits to see whether price forms a lower high and a lower low, which would begin a downtrend, or whether it recovers and resumes the uptrend.

What not to conclude

  • A CHoCH is not an entry signal on its own.
  • A BOS is not a promise that price will keep going.
  • Both can fail, and failed breaks are common, especially around news and session opens.

Practical habits

  1. Mark the higher-timeframe trend before labelling anything on a lower timeframe.
  2. Use one consistent rule for wicks versus closes.
  3. Record every BOS and CHoCH you label in a journal, along with what happened next. After fifty examples you will see how often each one followed through.

This article is educational and is not investment advice. Trading carries a risk of loss.