Not Every Gap Is an Entry
Gold leaves imbalances on the chart every session. Traders who learn the fair value gap quickly begin marking every one of them, then discover that many fail. The problem is rarely the identification. It is the absence of rules that decide when a gap is still valid and when it has been absorbed. This guide separates the fair value gap from the liquidity void and sets out the invalidation rules a disciplined desk applies before risk is committed.
FVG and Liquidity Void: The Structural Difference
Fair value gap
A fair value gap is a three candle pattern in which the wicks of the first and third candles do not overlap, leaving a price range that the middle candle crossed with only one side of the market participating. It is compact, defined by exact boundaries, and created by a single displacement candle.
Liquidity void
A liquidity void is wider and built from several consecutive one sided candles. It records a period in which resting orders were thin across a broad range, typically during a news repricing or a session open. Price often moves back through a void quickly because there is little opposing interest inside it. Treating a void as a precise entry zone is therefore a common error.
| Feature | Fair value gap | Liquidity void |
|---|---|---|
| Construction | Three candles, one displacement | Several one sided candles |
| Width | Compact, exact boundaries | Wide, often multiple dollars per ounce |
| Typical behaviour | Partial rebalance, reaction near CE | Rapid refill, weak reaction inside |
| Execution use | Refinement zone with confirmation | Target or context, rarely an entry |
Institutional Invalidation Rules
Rule 1: Body close, not wick
A wick through the far boundary is liquidity interaction. A candle body closing beyond it means the imbalance has been fully absorbed. Only the body close invalidates the zone. This mirrors the structure doctrine applied to BOS and CHoCH.
Rule 2: Respect consequent encroachment
Consequent encroachment (CE) is the 50% level of the gap. Strong gaps usually react in their upper half. A body close beyond CE does not invalidate the zone, but it downgrades it: the imbalance is weaker than expected and the remaining room before invalidation is small.
Rule 3: One test only
A gap that has been traded into and reacted once is mitigated. Second and third tests carry lower quality because the orders that created the reaction have already been used.
Rule 4: Context outranks the gap
A gap that opposes higher timeframe structure, or sits in the wrong half of the dealing range, is a lower probability zone regardless of its shape. Check premium and discount before treating any gap as a refinement zone.
Rule 5: Inversion requires confirmation
After a body close invalidation, the zone can act from the other side as an inversion FVG (IFVG). That reversal of role is a hypothesis, not a signal. It requires displacement and a structure shift in the new direction.
Interactive Invalidation Calculator
Enter the boundaries of a gap and the current price. The calculator returns the CE level, the exact invalidation condition and the zone status at each stage of the test.
FVG Invalidation and CE Calculator
Educational model- Gap size
- $12.00
- 50% CE level
- 4,124.00
- Invalidation close
- Below 4,118.00
- Fill depth
- 66.67%
Beyond 50% CE. Price has traded through consequent encroachment. The gap is weakening. A body close beyond the far boundary would invalidate it, so risk must already be defined.
This calculator classifies a zone. It is not a trade signal. Size any position from the stop distance with the position size calculator.
Session and News Context
Gaps formed during thin hours or around scheduled data behave differently from gaps formed during active London and New York liquidity. A void created by a CPI or NFP repricing is often refilled the same session, and spreads at that moment can fill orders inside the zone at poor prices. Review the slippage and liquidity blackout manual and the sessions and liquidity windows guide before trading any gap near a release. The live session clock and the CPI dashboard show when those windows are open.
Pre-Execution Checklist
- Classify the zone: compact FVG or wide liquidity void.
- Confirm it was created by displacement that broke structure.
- Confirm alignment with H1 and H4 structure and the correct premium or discount half.
- Mark the CE level and the invalidation close before price arrives.
- Check that the zone is untested and not inside a news window.
- Require a lower timeframe shift inside the zone before execution.
- Size from the distance to the invalidation level, never from the target.
Conclusion
A gap is a record of imbalance, not a promise of reaction. The fair value gap offers precision when context and displacement agree. The liquidity void offers direction and targets but rarely a clean entry. The difference between the two, and the discipline to retire a zone after a body close, removes a large share of avoidable losses.