Market structure is how ICT traders read the underlying trend of a chart — whether price is making higher highs and higher lows (bullish), lower highs and lower lows (bearish), or breaking that pattern altogether. Two events define almost every structural read: a Break of Structure (BOS), which confirms the current trend is continuing, and a Change of Character (CHoCH), which is the first warning sign that it might be reversing.
Every ICT entry model depends on reading structure correctly first — a liquidity sweep or fair value gap taken with the trend is a very different trade than the same pattern taken against it. Structure is the filter that tells you which direction you’re allowed to be looking for setups in.
Break of Structure (BOS)
A BOS occurs when price breaks a previous swing high (in an uptrend) or swing low (in a downtrend) in the direction of the existing trend. It is a continuation signal — confirmation that the trend that was already in place is still intact and likely to keep going. If price has been making higher highs and higher lows, and it breaks above the most recent high, that’s a bullish BOS.
Change of Character (CHoCH)
A CHoCH is the first break of structure against the prevailing trend — the earliest technical warning that the trend may be reversing. In an uptrend, a CHoCH happens when price breaks below the most recent higher low (rather than making a new higher high). This doesn’t confirm a reversal on its own, but it is the signal that shifts a trader’s bias from continuation to watching for a potential reversal setup.
A simple way to remember the difference: BOS confirms the trend you’re already in. CHoCH questions it. A CHoCH followed by a further break in the new direction is what ICT traders call a Market Structure Shift (MSS) — the point where the reversal is considered confirmed rather than just suspected.
Market Structure Shift (MSS)
An MSS is essentially a confirmed CHoCH — the first break of structure against the trend, ideally accompanied by displacement (a strong, fast, wide-ranging candle) rather than a slow grind through the level. Displacement is what separates a genuine institutional shift from a level simply being tested and holding. Many ICT entry models wait specifically for the MSS with displacement before looking for an entry, rather than acting on the CHoCH alone.
Premium and discount
Once a directional range is established, ICT traders divide it at the 50% midpoint — known as equilibrium. The upper half of the range is the premium zone (expensive — where you look to sell), and the lower half is the discount zone (cheap — where you look to buy). A bullish setup taken in the discount half of a range has a structurally sound reason to work; the same setup taken deep in premium is fighting the more favourable pricing zone.
| Signal | What it means | What it does NOT mean |
|---|
| BOS (Break of Structure) | Trend is continuing — a new high/low formed in the existing direction | Does not indicate a reversal is coming |
| CHoCH (Change of Character) | First break against the trend — an early reversal warning | Does not confirm the reversal on its own |
| MSS (Market Structure Shift) | A CHoCH confirmed with displacement — the reversal is now considered valid | Does not guarantee price won’t retest the old range first |
Common mistakes
Treating every CHoCH as a confirmed reversal. A CHoCH is a warning sign, not an entry signal by itself — many CHoCHs fail and price resumes the original trend. Wait for the MSS with displacement, or for a liquidity sweep plus FVG in the new direction, before entering.
Ignoring the higher-timeframe structure. A bullish CHoCH on the 5-minute chart inside a strongly bearish daily trend is a much lower-probability reversal than the same CHoCH forming when the daily structure already supports a shift.
Buying in premium or selling in discount out of impatience. Taking a long entry in the upper half of a range, simply because a bullish pattern appeared there, ignores that the more favourable buying zone was the discount half — the trade may still work, but the risk:reward is structurally worse.
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