What is market structure in forex trading?

How to spot it

Price never moves in a straight line. It pushes, pauses, pulls back and pushes again, and every turn leaves a peak or a trough behind. Market structure is what you get when you mark those turning points and compare each one with the one before it. Nothing else is needed: no indicator, no volume, only highs and lows.

The comparison is always like against like. A swing high is compared with the previous swing high, a swing low with the previous swing low. If both are stepping up, the chart is making higher highs (HH) and higher lows (HL), and SMC traders call that bullish structure. If both are stepping down, it is making lower highs (LH) and lower lows (LL): bearish structure. A mix, such as a higher high followed by a lower low, is a chart in transition or in a range.

Structure only means something if the turning points are chosen by a rule rather than by eye. Two people who pick swings by feel will label the same chart differently, and both will find the trend they hoped for. That is why the first step is a fixed definition of a swing high and swing low.

Step by step

1. Mark every confirmed swing high and swing low using one fixed rule.
2. Keep them alternating: between two swing highs there is exactly one swing low, the lowest one.
3. Label each swing high against the previous swing high: HH if it is higher, LH if it is lower.
4. Label each swing low against the previous swing low: HL if it is higher, LL if it is lower.
5. Read the last few labels together. HH with HL is an uptrend, LH with LL is a downtrend, anything else is undecided.
6. Note the most recent unbroken swing high and swing low. Those two levels are where the next structural event will happen.

The three states of structure

• Bullish structure: higher highs and higher lows. Each pullback stops above the last one, and each push exceeds the last peak. The level that matters most is the latest higher low, because the trend is intact while it holds.
• Bearish structure: lower highs and lower lows. Each bounce fails below the last one. The level that matters most is the latest lower high.
• Range or transition: the labels disagree, for example a lower high followed by a higher low. Price is contained between a swing high and a swing low, which SMC traders frame as a dealing range with a premium half and a discount half.

When structure breaks

Labels describe the trend so far. Two named events describe what happens at its edges. A break of structure (BOS) is a candle closing beyond the last swing in the direction of the trend, which is read as continuation. A change of character (CHoCH) is a candle closing beyond the last swing against the trend, which is read as the first sign of a possible turn.

Both events are defined by a candle close, not by a wick. A wick that pokes through a swing and comes back has not broken structure. SMC traders give that a different name, a liquidity sweep, and read it very differently.

Worked example

The chart below is a generated, simulated price series with a known set of turning points planted in it. Look at it first without the Lens and try to find the swings yourself: every peak that stands clear of the two candles on each side, and every trough that does the same.

Then open the Lens. It marks the swings the rule kept and gives each one its label. Follow them left to right. The useful habit is to say the comparison out loud: this high against that high, this low against that low. Where your eye chose a different candle, check the two candles on each side of it. Usually one of them was equal or higher, so the rule did not count it.

Reading the chart, step by step

1. The rule keeps 8 swings on this chart. Read left to right, the labelled ones are HH at 0.64080 (candle 17), HL at 0.63836 (candle 21), HH at 0.64349 (candle 28), HL at 0.64097 (candle 31), HH at 0.64574 (candle 37), and HL at 0.64279 (candle 41).
2. Highs and lows are stepping up, so the structure is read as bullish.
3. Candle 17 closes at 0.64063, beyond the swing high at 0.63963 (candle 8): a break of structure (BOS).
4. Candle 25 closes at 0.64103, beyond the swing high at 0.64080 (candle 17): a break of structure (BOS).
5. Candle 35 closes at 0.64399, beyond the swing high at 0.64349 (candle 28): a break of structure (BOS).

These numbers come from the generated chart above. Change the seed and the prices change; the rule does not.

Takeaway: Structure is a comparison of each swing with the previous swing of the same kind, and it is only as reliable as the rule that picks the swings.

Common mistakes

• Picking swings by eye. If the turning points are chosen by feel, the labels will follow your bias. Use one fixed rule for a swing and accept what it gives you, including the swings you would rather ignore.
• Comparing a high with a low. A higher low is higher than the previous low, not higher than some earlier high. Mixing the two comparisons is the most common labelling error on a fast chart.
• Treating every small wiggle as structure. On a low timeframe almost every third candle is a minor turn. Decide which timeframe your structure comes from and do not let a one-minute pullback overrule a one-hour trend. See multi-timeframe alignment.
• Reading a label as a forecast. A higher high tells you what price did. It does not tell you there will be another one. Structure describes; it does not predict.