Trading term

What is Break of structure (BOS)?

A break of structure is when price closes beyond the most recent swing point in the trend's own direction — a new higher high in an uptrend. It confirms that the existing trend is continuing rather than reversing, and its mirror image in a downtrend is a new lower low.

Market structure is a sequence of swing points. A break of structure, usually shortened to BOS, is the moment price takes out the last one in the trend's own direction. In an uptrend that means clearing the previous swing high; in a downtrend it means undercutting the previous swing low. Traders treat it as the trend renewing its lease: buyers were strong enough to make a new high, so the bullish read stands.

The detail that separates a real BOS from a false one is the close. Price wicking a cent through the old high and snapping straight back is not a break — that is far more likely a liquidity sweep, where the market grabbed the orders sitting above the high and reversed. Most traders require a candle to actually close beyond the level, and many wait for price to come back and hold the broken level before acting.

BOS has a sibling worth keeping straight. A BOS continues the trend; a change of character (CHoCH) breaks it in the opposite direction and warns of a reversal. Same mechanic, opposite meaning.

The trend renewing its lease
Prior swing high · $66Higher low · $60 — must holdBOScloses above $66swing highHLA body CLOSING beyond the level is the break — a wick through it is not.

Price closes at $68, clearing the $66 swing high — that close is the break of structure. The $60 higher low is now the level that has to hold for the read to stay bullish.

For example

In an uptrend the last swing high was $66 and the last swing low was $58. Price pulls back to $60, turns up, and closes at $68 — above $66. That close is the break of structure: the uptrend has confirmed itself, and $60 is now the higher low that has to hold.

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Why it matters to you

A BOS is the cleanest objective 'the trend is still on' signal available, and it requires no indicator — just a horizontal line at the last swing point and a close beyond it. That objectivity is the value: it replaces 'this looks strong' with a specific price that either trades or doesn't, which is what lets you plan an entry and a stop before the candle prints rather than after.

⚠ A wick through the level is not a break

The single most common way traders lose money on this concept is treating any poke above the old high as a break. Stop orders cluster just beyond obvious swing points, so price is frequently pulled through them for a moment and then reversed hard — that's a sweep, not a break. Wait for the close, and be extra sceptical when the poke happens on a long wick with no follow-through.

Frequently asked questions

What does break of structure (BOS) mean?

It means price has closed beyond the most recent swing point in the direction of the existing trend — a new higher high in an uptrend or a new lower low in a downtrend. It confirms the trend is continuing rather than turning.

What's the difference between BOS and CHoCH?

A BOS breaks structure in the trend's own direction and signals continuation. A change of character (CHoCH) breaks it against the trend — the first lower low in an uptrend, or first higher high in a downtrend — and signals a possible reversal. BOS says 'still going'; CHoCH says 'something changed'.

How do you confirm a break of structure?

Most traders require a candle body to close beyond the swing point rather than just a wick through it, and many want to see price retest the broken level and hold. A close-plus-retest filters out a large share of the false breaks caused by stop runs.

Is break of structure the same as a breakout?

They're closely related but not identical. A breakout is the general idea of price clearing any significant level, including range boundaries and pattern rails. A BOS specifically means clearing the last swing point in the direction of the trend, so it's a narrower, structure-based version of the same concept.

Related terms

Anchored VWAPAnchored VWAP is a volume-weighted average price that starts from one candle you choose, rather than resetting at the start of each session. You anchor it to a meaningful event — an earnings gap, a major low, a breakout — and it tracks the average price everyone has paid since.Ascending triangleAn ascending triangle is a bullish continuation pattern: a flat horizontal resistance line on top, with a rising trendline of higher lows beneath it. As the higher lows squeeze price against the ceiling, pressure builds — and it usually resolves with a breakout up through the resistance.ATR (Average True Range)ATR (Average True Range) measures how much a security typically moves in a period — its volatility — as an average of recent trading ranges. It doesn't say which direction price is heading, only how far it tends to travel, which makes it a core tool for stop-losses and position size.Bearish engulfingA bearish engulfing is a two-candle reversal pattern in which an up candle is followed by a down candle whose body completely covers it. The second candle opens above the previous close and closes below the previous open.
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