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A break of structure (BOS) is a continuation event. In Scalping Hub's framework, a BOS happens when price takes the relevant inducement and then breaks the relevant structural level in the direction of the existing structure. Price crossing a high or low is not enough on its own. If the inducement didn't come first, it isn't a BOS.
This guide covers:
- what a break of structure is, and what BOS means in trading;
- which structure a BOS breaks;
- what does not count as a BOS, and why;
- why inducement comes before the break;
- the bearish and bullish BOS sequences;
- wick vs body, and why no candle close is required;
- how a BOS works across timeframes;
- how BOS differs from reversal, and the mistakes to avoid.
Every chart here is an illustrative diagram, not a real trade, and nothing here is a trading signal.
What is a break of structure in trading?
A break of structure in trading is price breaking a relevant structural high or low after the relevant inducement has been taken, continuing the direction the structure is already moving in. BOS stands for break of structure. You'll see it in price-action, SMC and ICT-style content, where it is often defined as any new high or low. Scalping Hub uses a stricter definition:
Existing structure → relevant inducement → break of the relevant level = BOS
Three things have to be true together:
- There is existing directional structure. Price is already making higher highs and higher lows, or lower highs and lower lows.
- The relevant inducement has been taken. Price has induced or swept the relevant external liquidity first.
- The relevant structural level is then broken in the existing direction.
The classification is simple: it is either a BOS or it is not a BOS. There is no partial version of it.
Which structure does a BOS break?
A chart is full of small swings, and treating every one as structure is how traders end up reacting to noise. The useful question is: which highs and lows define the structure right now?
- External structure is made by the swing points at the boundaries of the range. A swing becomes external because it broke the previous relevant structure.
- Internal structure is the smaller swings that develop inside that range. They happen constantly and price trades through them, but they are not what a BOS is read against.
The same priority applies to liquidity. Price works toward external liquidity, the liquidity resting at the boundaries of the structure. Movement inside the range is described as internal movement; it is never promoted to a BOS.
What is not a break of structure?
A lot of what gets called a BOS isn't one. In Scalping Hub's framework, the following are not a break of structure:
- A new high or low with no inducement before it. Price is extending, nothing more.
- A break of a small swing inside the range. That is internal movement, not the relevant structure.
- A break where the relevant liquidity is still untaken. The level gave way, but the sequence is incomplete.
| BOS | Not a BOS | |
|---|---|---|
| Relevant inducement first? | Yes, it has been taken | No, or not the relevant one |
| Level broken | The relevant external structural level | Any swing, including minor ones |
| How to read it | Continuation of the existing structure | Price extending, with nothing confirmed |
None of this means a break without inducement is unimportant. Price still moved. It just doesn't earn the label, and treating it as a BOS is the most common mistake in this topic.
A break tells you a level gave way. The inducement before it tells you whether it was a BOS.
Why inducement comes before a BOS
Liquidity tends to build through repeated interaction around a level: equal highs, equal lows, buildup or compression. It doesn't build around every random swing. Inducement is price taking that liquidity at the relevant external level. In Scalping Hub's framework, inducement and a liquidity sweep describe essentially the same liquidity event, and we use both terms.
The order matters:
- Inducement first. The liquidity that was resting at the relevant level has been taken.
- Then the structural break. Price breaks the relevant level in the existing direction, and that break is the BOS.
If price breaks a level while the relevant liquidity is still sitting untaken, the sequence isn't there yet. The inducement is what gives the break its meaning. Which inducement is relevant, and how Scalping Hub weighs it, is taught inside our programs and isn't covered here.
Bearish BOS sequence
A bearish BOS continues an existing downtrend in structure:
- Existing bearish structure. Price is making lower highs and lower lows.
- Relevant inducement. Price induces or sweeps the relevant external high, taking the liquidity built up around it.
- Break lower. Price breaks the relevant structural low, by wick or by body.
- Bearish BOS. That break of the relevant low, after the inducement, is a bearish continuation BOS.
Bearish structure → inducement of the relevant external high → break of the relevant low = bearish BOS
Then the cycle repeats. A new relevant external high forms, price induces it, and the next relevant low breaks. That repetition is what clean bearish delivery looks like: induce → continue lower → induce → continue lower.
Bullish BOS sequence
The bullish sequence is the inverse:
- Existing bullish structure. Price is making higher highs and higher lows.
- Relevant inducement. Price induces or sweeps the relevant external low, taking the liquidity built up beneath it.
- Break higher. Price breaks the relevant structural high, by wick or by body.
- Bullish BOS. That break of the relevant high, after the inducement, is a bullish continuation BOS.
Bullish structure → inducement of the relevant external low → break of the relevant high = bullish BOS
In the diagram, the relevant external low is induced first. Only after that does the break of the structural high earn the BOS label, and the same pattern can then repeat.
Wick or body: is a candle close required?
No. Scalping Hub doesn't require a candle close beyond the level for a BOS. Once the required context is in place, meaning there is existing structure and the relevant inducement has been taken, a wick beyond the relevant structural level is enough:
- a wick beyond the relevant level counts as the break;
- a body beyond the relevant level counts as the break.
Neither is the deciding rule. The context is. A wick through a level with no inducement behind it still isn't a BOS, and a body that closes through a level doesn't turn a break without inducement into one. That's why wick = not a BOS and body close = BOS are both shortcuts we don't use.
It also helps to mark the structural level being broken, the horizontal high or low, rather than the candle that crossed it. If you label candles, it's easy to start calling any big move a BOS. If you label levels, you have to ask which level was broken and whether the inducement came first.
BOS across timeframes
Every timeframe owns its own structure. A BOS is read on one timeframe: the existing structure, the inducement and the break all belong to the chart you're analyzing.
- If you're reading the 1-hour chart, the structure, inducement and break are all on the 1-hour chart.
- If you're reading the 15-minute chart, they're all on the 15-minute chart.
Don't stitch timeframes together. An inducement on one timeframe and a break on another isn't one sequence.
Timeframes also affect significance. A BOS on the 1-minute chart built on same-day inducement is a minor BOS. It's a real structural event on that timeframe, but it isn't a major one. A BOS that follows meaningful higher-timeframe inducement carries more weight. There's no single best timeframe: choose the one you're analyzing and keep the sequence complete on it.
A lower timeframe can also move against a higher one for a while. That is local structure on the lower chart, and it doesn't rewrite the structure on the higher one. For how scalpers give each timeframe a fixed job, see our guide to scalping trading.
BOS vs reversal
A break of structure describes continuation: price continues in the direction of the existing structure after the relevant inducement and the structural break. A reversal is a different concept with its own sequence and its own terminology. If you're looking for how structure changes direction, read our guide to Change of Character (CHoCH), which covers it in full, including the market structure shift.
A simple way to keep them apart: a BOS keeps the existing structure going, while a reversal is about the structure changing. Don't use one label for the other.
How to identify a break of structure, step by step
- Choose your timeframe and stay on it. The whole sequence is read there.
- Mark the existing structure. Is price making higher highs and higher lows, or lower highs and lower lows?
- Mark the relevant external levels. Find the external high and low that define the range, and set the smaller swings inside it aside.
- Look at where liquidity has built up. Equal highs or lows and repeated interaction at the relevant external level show what price may need to take.
- Confirm the inducement came first. Has price taken the relevant external liquidity?
- Then look for the break. If price breaks the relevant structural level in the existing direction, by wick or by body, that's the BOS. If not, it isn't one.
- Weigh the significance. Note the timeframe and how meaningful the inducement was.
There is no one-candle shortcut. The sequence is what you're reading.
Common BOS mistakes
- Calling every high or low break a BOS. Without the relevant inducement first, it's price extending.
- Ignoring inducement. The inducement is part of the definition, not an optional extra.
- Requiring a candle close. A wick or a body can break the level once the context is there.
- Confusing reversal with continuation. A BOS continues the existing structure. A change in direction is a different concept.
- Promoting small swings inside the range to BOS. Movement inside the external range isn't what a BOS is read against.
- Labeling the candle instead of the level. The BOS is the structural level being broken.
- Stitching timeframes into one sequence. Each sequence belongs on one timeframe.
- Treating every BOS as equally significant. A 1-minute BOS on same-day inducement is minor.
Frequently asked questions
What is a break of structure in trading?
A break of structure is price breaking a relevant structural high or low in the direction of the existing structure after the relevant inducement has been taken. In Scalping Hub's framework it is a continuation event, and a break without that inducement is not a BOS.
What does BOS mean in trading?
BOS stands for break of structure. It's widely used in price-action, SMC and ICT-style content. Scalping Hub uses it for continuation: existing structure, then relevant inducement, then the structural break.
What counts as a valid break of structure?
A break of the relevant structural level, in the direction of the existing structure, after the relevant inducement has been taken. If the inducement didn't come first, it isn't a BOS.
Is every new high or low a BOS?
No. A new high or low on its own is just price extending. It becomes a BOS only when the relevant inducement came first and the relevant structural level is broken.
Does a wick count as a break of structure?
Yes, once the required context exists. A wick beyond the relevant structural level counts as the break, and so does a body.
Is a candle close required for a BOS?
No. Scalping Hub doesn't require a candle close beyond the level. What matters is the relevant structural level and the inducement before it.
Is a break of structure a continuation or a reversal?
A continuation. A BOS keeps the existing structure going. Reversal is a separate concept, covered in our Change of Character guide.
Which timeframe is best for a break of structure?
There isn't a single best one. Read each sequence completely on one timeframe. Significance grows with the timeframe and with how meaningful the inducement was, so a 1-minute BOS on same-day inducement is minor.
How is a BOS related to an order block?
A BOS shows that a move carried through the relevant structure. An order block is the transition candle at the origin of the move. They're separate concepts that are often read together.
Conclusion
A break of structure isn't just price crossing a line. In Scalping Hub's framework it is continuation, built from three parts in order: existing structure, the relevant inducement, then the break of the relevant level. If the inducement didn't come first, it isn't a BOS. A wick or a body can make the break, no candle close is required, and each sequence is read on one timeframe.
Next step: see how inducement forms in our Liquidity Sweep guide.
Trading involves risk. This article is for education only and is not financial advice. Scalping Hub does not provide signals or manage money.
