What is isolated margin and cross margin? The trading minute

Every man for himself, or all for one: the two currencies of the margin trader. On most leveraged crypto trading platforms, a margin mode is chosen before even opening a position. Two options are available to the trader: isolated margin, which limits risk to a single position, and cross margin, which pools the entire account balance as collateral (the guarantee deposited to cover a position). The choice may seem trivial, almost a technical detail that one checks without thinking. It is not. In the event of a market downturn, isolated margin limits the damage to what has been put on the table. Cross margin, on the other hand, engages the entire account, sometimes without the trader realizing it until it is too late.

Isolated margin, cross margin: two philosophies of risk

With isolated margin, you allocate a specific amount to a position, and only that money is at stake. Open a position of $200 with 10x leverage on Bitcoin using isolated margin, and the maximum loss remains capped at that $200, regardless of what happens to the rest of the account. The liquidation price depends solely on this margin, the chosen leverage, and the maintenance rate set by the platform.

Cross margin works the opposite way: it draws from the entire available balance to avoid the liquidation of a struggling position. On paper, this is reassuring: a losing position can be supported by the rest of the account, including gains from another position. However, if multiple positions plunge at the same time, or if the asset used as collateral itself loses value, the entire account can go up in smoke at once. Not just one line of the portfolio.

October 10, 2025: when cross margin took everything away

This risk is not theoretical; as usual, let’s take a real example. On October 10, 2025, Donald Trump’s announcement of a 100% tariff on Chinese imports triggered a massive sell-off in global markets, including crypto.

The price of Bitcoin fell to $106,560. More than $19 billion in leveraged positions were liquidated within 24 hours, according to an analysis by CoinDesk Research published on October 17, 2025, an unprecedented event in the history of the crypto market.

On Binance, the stablecoin USDe collapsed to as low as $0.65. This was no trivial matter: for users with a unified account (cross margin at the account level), this stablecoin also served as collateral. Its drop melted the value of the shared collateral, forcing the liquidation of Bitcoin or Ethereum positions that, taken in isolation, had not asked for anything. The price cascaded through stacked liquidation zones, a mechanism that reading the order book helps to anticipate. In short: cross margin turned an isolated accident on a stablecoin into a widespread liquidation of the account. A trader using isolated margin on these same positions would have, at worst, lost the stake engaged on each. Not the whole.

Isolated by default, cross in full knowledge

For an individual trader, the rule is simple to state, but less simple to follow when the account shows gains on several lines at the same time. By default, prefer isolated margin on any position you do not have a solid conviction about: the worst-case scenario remains capped, known in advance. Reserve cross margin for strategies where multiple positions genuinely hedge each other, not for a stack of disjointed bets hoping not to fall on the same day.

Before choosing a mode, also check the exact composition of your collateral. A cross margin account guaranteed by a stablecoin or a liquid staking token carries a hidden risk. If this collateral depreciates, the entire account suffers. Not just the concerned position. Real-time liquidation data, such as those published by Coinglass, provide an idea of the scale of these cascades with each market shake. A reflex to integrate into one’s overall risk management, alongside position size or stop-loss.