Isolated vs cross margin: what's the difference and which to choose

Isolated vs cross margin: what's the difference and which to choose

Before you open a futures position, the exchange asks which margin mode you want: isolated or cross. Many traders leave the default and only learn the difference at their first liquidation.

Let's go through both modes with a simple example and see which one to choose for an arbitrage trade.

What isolated margin is

In isolated mode, each position gets its own separate collateral. If the price moves against you, the position can only lose that amount.

The rest of your account balance is untouched. Liquidation of one position does not drag others down with it.

What cross margin is

In cross mode, the entire free balance of the account serves as shared collateral for all positions. A loss on one position is covered with money from the whole account.

Liquidation comes later because the buffer is larger. But if it does happen, you can lose much more than you allocated to the trade.

How isolated margin differs from cross margin

What this looks like in a hypothetical example

A textbook scenario with hypothetical numbers. You have 1,000 USDT in your account and open a position with 200 USDT of collateral.

• Isolated mode: if the price moves badly, you lose no more than 200 USDT, and 800 USDT stays in the account.
• Cross mode: the position holds out longer because all 1,000 USDT support it, but on a strong move the loss can eat the entire balance.
• If the account holds a second, profitable position, in cross mode its unrealized profit also works as collateral.

Both sides of the example are fair. The choice depends on which is worse for you: an early liquidation of one trade or risk to the whole account.

When cross margin saves a position

Cross mode works well when positions in the same account hedge each other. A loss on one is balanced by a profit on the other, and the shared collateral prevents the losing leg from being liquidated prematurely.

It also helps during short, sharp price wicks. An isolated position might get closed on the spike, while a cross position survives it thanks to the free balance.

When cross margin sinks the whole account

If the account holds a single directional position with high leverage, cross mode turns it into a bet with your entire balance. The price moves against you, and every free dollar goes into the loss.

From what we see, this is exactly how beginners suffer their most painful losses. The trade is opened "just for a bit", and the whole deposit ends up at risk.

Which margin mode to choose for an arbitrage trade

In a typical trade, the legs sit on different exchanges: spot on one and a perp on another, or two perps on two venues. There is no shared cross margin between exchanges, so each leg has to protect itself.

In our view, it is sensible to keep the margin buffer on the futures leg well above the minimum, whichever mode is set. A sharp price rally hits the short even if the spot on the other exchange is gaining value at the same moment.

• Isolated mode suits you if only one leg of the trade sits on the exchange and you want to know exactly how much is at risk.
• Cross mode is convenient if both legs are on the same exchange and one hedges the other.
• In either mode, keep a reserve for topping up margin and watch the liquidation price.

We believe the right mode is the one where you know the liquidation price of each leg in advance. If you cannot name it, the trade is worth recalculating.

Our tools

The margin buffer for each leg depends on which exchanges the positions are on and what the spread is there, so it is easier to see all venues in one window. Our arbitrage screener keeps dozens of venues in one window, refreshes quotes every second and shows each gap together with the volume actually behind it. The spread calculator helps you check what survives fees, network costs and slippage at your size. The bot is fully manual. It never connects to your exchange API keys.

To test the tools on a live market, ArbitrageScanner offers one day of free access to the whole ecosystem.

FAQ (Frequently Asked Questions)

1. What is the difference between isolated and cross margin?

In isolated mode, each position has its own collateral and can only lose that. In cross mode, the entire account balance serves as shared collateral, so liquidation comes later but affects more money.

2. Which margin is better for a beginner: isolated or cross?

Isolated is easier to control because the maximum loss per trade is known in advance. Cross margin requires understanding how the positions in your account affect each other.

3. Can you lose your entire deposit on cross margin?

Yes. If a position goes deep into loss, cross mode uses the entire free balance to support it, and a liquidation wipes out a large part of the account or all of it.

4. Can you change the margin mode on an open position?

It depends on the exchange. On many venues, the mode can only be changed before the position is opened or when there are no open orders on the contract, so it is better to choose in advance.

5. Which margin mode should I choose for arbitrage?

If the legs of the trade are on different exchanges, each is protected separately, and for the futures leg the margin buffer matters more than the mode. Cross is useful when both legs are on the same exchange and hedge each other.

Conclusion

Isolated margin limits a trade's loss to its collateral, while cross margin gives positions a shared safety buffer at the cost of risk to the whole account. There is no universally better mode.

For an arbitrage trade, what matters is not the name of the mode but the margin buffer on each leg and knowing the liquidation price. Work this out before entry, not after a sharp move.

IMPORTANT! We are software developers. We do not give recommendations or promises of earnings and we do not advise you to invest your money anywhere. Our software is fully manual, all your money stays under your own control. We show examples of how our clients have earned on arbitrage in the past, but we do not advise repeating those actions one to one. Your earnings depend solely on your own actions and on market factors.