Why cross margin can reach your whole balance, and how Australians can fence it off

A common story goes like this: someone moves a few thousand dollars of USDT into a futures wallet to have it ready, opens a small position, and is surprised when a sharp move wipes out far more than they planned. The position was in cross margin, so the exchange treated the whole wallet as collateral for that one trade. Cross margin is not a flaw; it reduces the chance of liquidation by sharing collateral. But it changes the question from how much is this trade worth to how much am I willing to lose in total, and many beginners never ask it.

Cross and isolated, in plain terms

In isolated margin, a position can only lose the margin you assigned to it. If that margin runs out, the position is liquidated and the rest of your futures balance is untouched. In cross margin, the available balance in the account backs every open position, so a losing trade keeps borrowing from it until the balance itself runs low. Binance, OKX, Bybit and Bitget all offer both modes, although account structures differ; unified or multi-currency accounts on some platforms can even count spot holdings as collateral.

Checking which mode you are actually in

On the futures order panel, look near the leverage selector for a label reading Cross or Isolated. Tap it to see and change the setting; on most platforms you cannot switch while a position is open in that contract. Then check the account level: on exchanges with unified accounts, open the account mode settings and read which balances count as margin. If spot coins are included, a futures loss could force sales of holdings you thought were separate. The help centre article on margin modes for each exchange explains current behaviour.

Fencing off what one trade can lose

The simplest fence is isolated margin with a fixed amount you can afford to lose on that idea. Another is to keep only the money you intend to risk in the futures account and leave the rest in spot or a funding wallet, moving more only by deliberate choice. On platforms that support subaccounts, a dedicated futures subaccount separates risk further. Whatever you choose, write down the maximum loss for the day before you open anything, and set a stop on every position rather than relying on the margin buffer.

When cross margin can be reasonable

Experienced traders use cross margin for hedged positions, where gains on one leg offset losses on another, or when they actively monitor and manage the account. If you are new, trading in the evening after work or holding positions overnight while Sydney or Perth sleeps, that monitoring is unlikely. Start with isolated margin, low leverage and a small futures balance. Once you have a record of how your trades behave, you can decide whether shared collateral suits your style.

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Scenario checkpoint

• Check the Cross or Isolated label beside the leverage selector before opening any futures position.
• Read the account mode settings to see whether spot holdings count as futures collateral.
• Keep only the amount you are prepared to lose in the futures account or a dedicated subaccount.
• Write a daily loss limit and place a stop on each position instead of relying on shared margin.