Cross-margin uses your entire account balance as collateral for all open positions simultaneously. If one position needs more margin to stay above the liquidation threshold, it draws from your total balance automatically. Isolated margin assigns a fixed amount of collateral to each individual position; if that position is liquidated, only the allocated margin is lost and the rest of your account is unaffected. The choice between them changes your maximum loss per trade and your liquidation behavior under adverse price moves.
How cross-margin and isolated margin work
In cross-margin mode on Binance or Bybit, your full available balance in the margin wallet backs all positions. A 5x long BTC and a 3x short ETH both draw from the same pool. If BTC moves against you, the margin wallet absorbs the unrealized loss from its full balance rather than triggering an early liquidation. Profits on the short ETH position offset the loss on the long BTC position in real time. The effective leverage on your total balance is determined by the sum of all exposures.
In isolated margin mode, you specify upfront how much margin backs each position. A $2,000 isolated position on BTC at 5x can lose at most $2,000 regardless of what else is in your account. The liquidation price is set by the specific margin allocated, not by your total balance. You can add margin to an isolated position to push the liquidation price further away, or reduce it to take margin back.
What this means for traders
Cross-margin is more capital-efficient when running hedged or correlated positions: the longs and shorts offset each other’s margin requirements. It suits traders who run a book of positions and manage risk at the portfolio level. The danger is that a single runaway position can drain your entire account balance, not just the allocated margin. A highly leveraged trade that goes wrong in cross-margin can wipe the full wallet.
Isolated margin limits blowup risk. A speculative position on a volatile altcoin should almost always be isolated: define exactly how much you are willing to lose, allocate that amount, and the rest of your capital is safe regardless of the outcome. Most professional advice defaults to isolated margin for directional trades on individual assets. Cross-margin is better reserved for hedging operations. See: perpetual futures explained and funding rate explained for the full cost structure of leveraged positions.
A concrete example
Account balance: $10,000. Cross-margin: you open a 10x long on $1,000 notional and a 10x long on $2,000 notional. Both share the $10,000 as collateral. If both positions move 8% against you, the combined $2,400 loss is absorbed by the total balance; you have $7,600 left and no liquidation. Isolated margin: same positions, $1,000 isolated to position A and $2,000 isolated to position B. Each position’s liquidation is determined only by its allocated margin. Position A is liquidated at exactly 9% adverse movement (losing the $1,000 allocated). Position B liquidates at roughly 8% adverse movement. Losses cap at the isolated amounts. Cross-margin survived both moves but consumed more implied collateral per position.
Frequently asked questions
Can you switch between cross and isolated margin on an open position?
On most exchanges, you cannot switch margin mode while a position is open. You must close the position, change the margin mode setting, then reopen. Some platforms (Bybit, OKX) allow switching modes but require no open positions in that pair to do so. Always check the exchange’s specific mechanics before assuming this is possible mid-trade.
Which mode do market makers use?
Professional market makers and arbitrageurs typically use cross-margin because they run offsetting positions simultaneously and need the efficiency of shared collateral. Their risk management happens at the system level, not at the per-position level. For traders who do not run fully hedged books, that logic does not apply directly.
Does isolated margin prevent all loss beyond the allocated amount?
Yes, with one caveat: in extreme market conditions (gap moves, insufficient liquidation bot coverage), a position can go through its liquidation price so quickly that the protocol takes a loss. The exchange’s insurance fund covers this shortfall; you are not charged beyond your isolated margin. This is called auto-deleveraging (ADL) and is a documented edge case on all major perp exchanges.
