Isolated margin assigns collateral to an individual futures position; cross margin shares eligible collateral within a specified account, wallet, or product pool. Isolated margin can limit which collateral supports a position, while cross margin can use spare eligible funds to support positions—but that same pool may absorb more of their losses. Neither mode is inherently safer, and “cross” does not automatically put every asset at an exchange at risk.
How the two margin modes allocate collateral
Isolated margin: collateral assigned to a position
With isolated margin, collateral is allocated to an individual position or trading pair. Its liquidation risk is assessed using the margin assigned to that position. If the position deteriorates, that allocated collateral is the pool supporting it; unrelated account funds are not necessarily added automatically. Some platforms let traders add margin manually or offer automatic replenishment features, so the boundary depends on the platform and settings.
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For example, Bybit says its Auto-Margin Replenishment (AMR) feature can use available account balance when triggered. That means isolated margin should not be treated as an absolute firewall if a feature can transfer additional funds to the position. See Bybit’s FAQ — USDT Perpetual and Expiry Contracts.
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Cross margin: eligible collateral shared within a defined pool
Cross margin can draw on eligible collateral shared within the relevant account, wallet, or product scope. This may give a position support from spare collateral in that pool, rather than only from an amount assigned to that position. But eligibility and boundaries are exchange-specific: a balance outside the relevant pool may not count.
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Binance’s COIN-M futures documentation, for instance, says BTC held in the COIN-M Futures Wallet can support BTC-based perpetual and delivery contracts in Cross Margin Mode. That is a specific wallet-and-product example, not evidence that all Binance assets or wallets are pooled. See Binance’s COIN-M Futures Cross Margin guide.
What happens to collateral when a position loses value?
The central trade-off is containment versus pooling. With isolated margin, losses on a position are generally supported by the collateral assigned to it, subject to any platform features that add funds. With cross margin, available eligible collateral can help support positions as a group, which may reduce the chance that one position is liquidated while spare collateral remains in the pool. But losses can also consume more of that shared pool.
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A cross-margin liquidation price may change as other positions, eligible balances, or market marks change. It is therefore an account- or pool-level risk picture, not necessarily a fixed position-only boundary. A displayed price should be interpreted in the context of the account’s current positions and collateral.
Liquidation triggers depend on the exchange and product
There is no single liquidation rule that applies to every crypto futures platform. Bybit’s Unified Trading Account (UTA) documentation distinguishes the modes this way: isolated liquidation is triggered when Mark Price reaches the position’s liquidation price; for cross and portfolio margin, account risk is evaluated across positions and liquidation is triggered when the maintenance margin rate (MMR) reaches 100%. These are Bybit UTA rules, not universal thresholds or mechanics. See Bybit’s UTA Trading Rules.
Liquidation rules and displayed risk indicators can depend on the contract, account mode, collateral eligibility, and platform procedures. Check the current documentation for the exact futures product you trade rather than assuming that a rule from a spot-margin account or another futures wallet applies.
Comparison at a glance
| Question | Isolated margin | Cross margin |
|---|---|---|
| What collateral supports the position? | Margin allocated to the individual position or trading pair. | Eligible collateral shared within the defined account, wallet, or product pool. |
| Where can losses draw collateral from? | Generally from the position’s allocated margin; manual additions or platform features such as auto-replenishment can change the boundary. | From the shared eligible pool supporting positions, within that platform’s rules. |
| How is liquidation risk assessed? | Often position-focused. Bybit UTA triggers isolated liquidation when Mark Price reaches the position’s liquidation price. | Pool or account risk can depend on multiple positions and balances. Bybit UTA triggers cross liquidation when MMR reaches 100%. |
| What is the operational trade-off? | Collateral is not automatically shared from unrelated funds, so the position may need margin added to it. | Shared funds can support positions, but a loss can draw on a broader eligible pool. |
| What defines the boundary? | Position, pair, and any enabled features that can add margin. | Exchange rules for the account mode, asset, wallet, contract, and eligible collateral. |
How to choose a mode to evaluate
- Understand the loss boundary you want. Isolated margin makes the position’s assigned collateral easier to distinguish from funds elsewhere, while cross margin pools eligible funds within its defined scope.
- Check what the platform can add or share. Review whether isolated positions have automatic replenishment and exactly which balances count toward cross margin.
- Read the product-specific liquidation rule. Confirm whether the contract uses a position liquidation price, an account maintenance-margin test, or another documented procedure.
- Consider the full risk setup. Margin mode alone does not determine potential losses; position size, leverage, maintenance-margin tiers, mark-price movements, collateral haircuts, and platform procedures may also matter.
Keep portfolio margin distinct
Portfolio margin is not another name for cross margin. Bybit UTA lists isolated, cross, and portfolio margin as three separate modes; portfolio margin uses portfolio-level risk assessment. Do not assume its collateral treatment or liquidation behavior is identical to cross margin.
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What to verify before opening a futures position
- Identify the exact contract and account mode. Confirm whether you are looking at futures documentation for the contract you plan to trade, rather than spot margin or another product.
- Find the collateral boundary. Check which asset balances, wallet, and account are eligible to support the position in the selected mode.
- Check margin-management settings. For isolated margin, see whether margin can be added manually or replenished automatically; for cross margin, identify the full eligible pool.
- Read the liquidation conditions. Note the platform’s trigger and the risk metric it uses, and how other positions or balances can affect it.
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