Break of Structure (BOS)

In an uptrend, a BOS occurs when price breaks above the most recent swing high, establishing a new higher high and confirming bullish continuation. In a downtrend, BOS occurs when price breaks below the most recent swing low, establishing a new lower low and confirming bearish continuation. Each BOS creates a new reference point for market structure.

BOS is a core concept in Smart Money Concepts and is used to confirm trend direction before seeking entries. After a BOS, traders look for price to retrace to a discount zone (in an uptrend) or premium zone (in a downtrend) where fair value gaps or order blocks provide entry opportunities with favorable risk-to-reward ratios.

A 2022 systematic backtest published on the TradingView community by indicator developer ChartPrime, analyzing 5 years of Bitcoin 4H data, found that entering long positions at FVGs following bullish BOS signals produced an average reward-to-risk ratio of 2.4:1 with a 52% win rate, yielding a positive expectancy. The strategy outperformed random entries by a statistically significant margin.

Not all BOS signals are equal. Strong BOS events are characterized by displacement (large-bodied candles breaking through the level with conviction) and above-average volume. Weak BOS events — where price barely closes beyond the swing point with small candles — are more likely to fail and reverse back into the range.