What it means
Break of structure (BOS) is the SMC/ICT term for price closing beyond the most recent swing high (in an uptrend) or swing low (in a downtrend). It confirms TREND CONTINUATION — the existing trend is intact and has produced a new structural extreme. BOS contrasts with Change of Character (CHoCH), which marks a trend REVERSAL by breaking the opposite-direction swing.
Why it matters
BOS provides objective structural confirmation that a trend is alive and progressing. Without BOS, traders rely on subjective trend assessment; with BOS, the trend status is mechanical. The framework lets you stay aligned with the dominant flow and avoid counter-trend trades that are based on premature reversal expectations.
How to use it
Identify swing highs and lows on your trading timeframe. In an uptrend: BOS confirmed when price closes ABOVE the most recent swing high. In a downtrend: BOS confirmed when price closes BELOW the most recent swing low. Use BOS as continuation entry signal or as confirmation to hold existing trend-aligned positions. Stop typically beyond the opposite swing extreme.
NVDA July 2024: prior swing high $135 (July 10). Subsequent decline to $97 (Aug 5), rally back up. Close above $135 on Aug 22 = BOS, confirming reversal-to-uptrend. Rally continued to $146 over next 3 weeks.
BOS confirmation rules — close vs wick
Strict definition: price must CLOSE beyond the prior swing extreme. Wicks that pierce without close are NOT a BOS. The close requirement filters out intra-session manipulation that pokes through the level briefly to grab stops without sustaining the move. Some SMC practitioners use a stricter definition: candle BODY must close beyond the level (not just close-of-day) — even tighter filter.
Identifying the relevant swing for BOS
The relevant swing high/low is typically the MOST RECENT material pivot on your trading timeframe. 'Material' = the swing that produced ≥1 ATR of move from the prior pivot. Minor wiggles that produce sub-ATR swings don't count as structural pivots. Some traders use a fractal approach (e.g., a swing high requires the high candle to be higher than the 2 candles before and 2 after).
Frequently asked
What's the difference between BOS and breakout?
Same concept, different framing. 'Breakout' is the broader chart-pattern term (close beyond any defined level — trendline, range, pattern). 'Break of structure' is the SMC-specific term for closing beyond a swing high/low in the trend's direction. BOS is a specific subset of breakouts.
Does BOS confirm a NEW trend or continue the existing one?
Confirms continuation of the EXISTING trend. To confirm a new trend (reversal), you need Change of Character (CHoCH) — breaking the opposite-direction swing. BOS = continuation; CHoCH = reversal.
How does BOS relate to liquidity sweep?
A liquidity sweep often PRECEDES a BOS — price wicks beyond a minor swing to grab stops, then closes back inside, then the actual BOS happens on a subsequent move. The pattern is: liquidity sweep (manipulation) → reversal → BOS (confirmation).
Can BOS fail?
Yes — about 30-40% of BOS events are followed by reversal back through the broken level within 5-15 sessions. This is why SMC practitioners wait for FOLLOW-THROUGH (e.g., a continuation BOS on the next swing) before treating the trend as confirmed.
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