Fair Value Gap vs Imbalance vs Liquidity Void

FVG vs imbalance is mostly a question of vocabulary, and liquidity void is a question of scale. A fair value gap (FVG) is a precise three-candle pattern: the wicks of candle one and candle three do not overlap. "Imbalance" is a looser word, and in smart money material it is usually used as another name for the same gap. A liquidity void is the large version: a one-sided run of candles that often contains several FVGs stacked inside it.

This guide separates the three terms, adds the fourth one people mix in (volume imbalance), and shows a real BTCUSDT 1h example where one sell-off leaves three FVGs in a row. Definitions differ between authors. This article states which version it uses, and where sources disagree, it says so. For the basic pattern, start with the fair value gap guide.

The short answer

• Fair value gap (FVG): three candles, and the first candle's wick and the third candle's wick leave an untraded span between them.
• Imbalance: a loose label for one-sided price action. Many traders use it as a synonym for FVG, but the word can describe any stretch where one side dominated.
• Volume imbalance: a gap between two candle bodies where the wicks still overlap. Thinner than an FVG, because price did trade there.
• Liquidity void: a long one-sided run, many candles, with very little two-way trading across a wide price range. It often holds several FVGs.

All four describe the same underlying idea: price moved so fast in one direction that buyers and sellers never traded evenly along the way. They differ in size and in how strictly they are defined.

FVG vs imbalance: usually the same thing

A bullish FVG needs three candles. The low of candle three sits above the high of candle one, and the span between those two prices is the gap. A bearish FVG is the mirror: the high of candle three sits below the low of candle one. The middle candle is normally a wide-range displacement candle. LuxAlgo's FVG reference uses exactly this rule, and the displacement guide explains what makes the middle candle count.

Imbalance and the related word "inefficiency" are the same family. The Writo Finance ICT module describes an imbalance as a stretch of price delivery where buyers and sellers were not evenly matched. FXOpen equates an FVG with an imbalance in smart money concepts, but also notes that "imbalance" can refer to any zone of one-sided price action.

So the practical rule is simple:

• If someone says "imbalance" and points at a three-candle gap, they mean an FVG.
• If they point at a long leg, they mean a wider one-sided area, and the word is doing the job of "void".
• If you need a precise term, say FVG and give the candle rule.

The SMC and ICT communities share this vocabulary but not always the same strictness, which is covered in SMC vs ICT.

Volume imbalance: the thinner cousin

A volume imbalance is the term most often confused with an FVG. In LuxAlgo's wording it is a gap between candle bodies whose wicks still overlap. The wicks mean price did trade through that span, just briefly. In an FVG the wicks do not overlap, so the span has no trading at all on that chart.

Writo Finance describes it as an untraded gap between two candle bodies, without the three-candle structure that an FVG needs. The two descriptions are close but not identical, so check how your charting tool or teacher defines it before you rely on it. This article uses the LuxAlgo version.

Because it is thinner, a volume imbalance is a weaker mark than an FVG on the same chart. Treat it as a minor reference point, not a zone with the same weight.

Liquidity void: the large version

A liquidity void is what you get when a one-sided move keeps going. TradingFinder calls it a larger pattern that encompasses several fair value gaps, formed by large candles with no retracement after a break from consolidation. Writo Finance describes it as a large stretch of the chart with almost no meaningful trading activity across a wide price range.

Three differences matter:

1. Scale. An FVG is three candles. A void spans many candles and can hold two, three or more FVGs.
2. Cause. An FVG appears after one strong candle. A void usually needs a sustained run, such as a reaction to a news release or a liquidity sweep. FXOpen links voids to macro data, central bank decisions and liquidity sweeps.
3. Fill behaviour. FXOpen says FVGs often fill quickly and voids can stay open longer, while TradingFinder says there is no guaranteed time or fill for a void. Both sources agree that neither type is guaranteed to fill.

That last point is a claim from trader-education sites, not a law of the market, and the next section tests it on one real example.

The three terms side by side

The first figure shows all three on made-up candles. Panel 1 is a plain FVG. Panel 2 is a volume imbalance: the bodies of candle one and candle three do not touch, but the wicks do. Panel 3 is a void: five strong candles in a row, with three FVGs inside the run.

The table sums up the rules.

How it looks on a real chart

The data below is from Binance spot klines, fetched on 18 Oct 2026, with all times in UTC (add 3 hours for MSK). The chart is BTCUSDT on the 1h timeframe, 12 to 13 Oct 2026.

The numbers match the figure:

1. A one-sided leg with three FVGs. After a high of 83,147.95 at 20:00 UTC (23:00 MSK), four consecutive 1h candles close lower, from 21:00 to 00:00 UTC. Three overlapping three-candle groups each leave a gap between the outer wicks. The gaps are 82,781.61 to 82,861.81, then 82,270.87 to 82,431.44, then 81,959.53 to 82,101.65. They are about 0.10%, 0.19% and 0.17% of price. Taken together, these four candles are the kind of run that sources call a liquidity void.
2. The low. The 00:00 UTC candle (03:00 MSK on 13 Oct) reaches 81,033.66. From the 83,096.61 open of the first leg candle to the 81,442.56 close of the last, that is about 2.0% down.
3. The refill. The next candle, 01:00 UTC, trades from 81,432.44 to 82,471.18, which takes out the two lower gaps entirely. The 02:00 UTC candle reaches 83,100, which covers the top gap too. By 03:00 UTC the high is 83,600, above the 83,147.95 start of the leg.

Is this a "void"? It meets the loose description: a short run of one-sided candles with three FVGs inside. It does not meet the strict version in TradingFinder's article, which expects no wicks back into the previous candles' range. Here the wicks overlap a little. That is the practical lesson: the label depends on the author, so write down your own rule.

This example also shows a single case of quick fills, nothing more. FXOpen and TradingFinder both state that a fill is not guaranteed, and one retracement is not evidence about how often it happens. For live BTC context, see the Bitcoin market page.

How traders use the difference

Traders who work with these terms usually treat them as levels to watch, not signals:

• FVG. The common plan is to wait for price to return into the gap and look for a reaction, with the stop beyond the gap. The IFVG guide covers what happens when a gap fails and the zone changes role.
• Volume imbalance. A minor reference point. It carries less weight than an FVG on the same chart.
• Liquidity void. FXOpen describes voids as transit zones: price may fill part of one, or treat it as continuation. TradingFinder says price often returns at least to the midpoint, and that voids look clearer on H1, H4 and Daily than on lower timeframes. Both are descriptions from those sites, not tested rules.

Whatever you mark, check the risk first. The risk reward calculator shows what a stop beyond the gap does to the trade before you take it.

Common mistakes

• Using the words as if they were different tools. In most SMC material FVG and imbalance point at the same gap. Argue about the candle rule, not the name.
• Calling every 3-candle gap important. LuxAlgo notes that three-candle gaps are common, which is why tools often add a minimum size or require structure confluence.
• Assuming a fill. A gap is a scenario to plan around. Some fill partly, some never fill.
• Trading the gap without the context. FVGs are rarely traded alone. Check structure and liquidity first; the liquidity sweep guide shows one common context.
• Skipping the timeframe. A void on a 1h chart is a minor wiggle on the daily. Say which timeframe you mean every time. More lessons like this are in the Learn ICT hub.

FAQ

What is the difference between an FVG and an imbalance? In most smart money material they are the same thing: a three-candle gap where the wicks of candles one and three do not overlap. "Imbalance" is the looser word and can also describe any one-sided stretch of price action.

What is a liquidity void in ICT? It is a large one-sided run of candles with very little two-way trading across a wide price range. It is bigger than an FVG and often contains several of them.

Is a volume imbalance the same as an FVG? No. A volume imbalance is a gap between candle bodies where the wicks still overlap, so price did trade there. In an FVG the wicks do not overlap.

Do fair value gaps and liquidity voids always get filled? No. Sources that teach these concepts say a fill is not guaranteed, and some gaps fill only partly or never. Treat a fill as a scenario, not a rule.