Risk management

Cross Margin vs. Isolated Margin: Which to Choose in Each Situation

Astron Team · 09/24/2026 · 6 min read

Anyone trading with margin, especially in markets like derivatives and cryptocurrencies, needs to make a decision that goes unnoticed by many beginners: use cross margin or isolated margin. This choice doesn't change the entry strategy itself, but it completely changes how risk behaves across different trades open at the same time.

Understanding the difference between the two models avoids unpleasant surprises, like losing more capital than expected on a single trade, or, on the other hand, closing a position too early due to lack of available margin.

What isolated margin is

With isolated margin, each trade receives a specific amount of margin, separate from the rest of the account's capital. If that trade goes against the trader and the price hits the margin limit allocated to it, only that amount is lost — the rest of the capital in the account remains intact and protected from that specific trade.

What cross margin is

With cross margin, the entire available account balance backs the open trades. That means a losing position can draw on capital from other parts of the account to stay open longer, avoiding a premature forced closure, but also exposing the entire account balance to that trade's risk, if the move keeps going unfavorably.

A numerical example comparing the two models

Imagine a trader with R$ 10,000.00 in the account, who opens a trade allocating R$ 1,000.00 in isolated margin. If the market moves strongly against the position, the maximum loss on that trade is capped at R$ 1,000.00 — the remaining R$ 9,000.00 stays available and protected, even if the trade gets liquidated.

Now imagine the same trader using cross margin, with the same trade. If the market moves against the position, the system can use part of the remaining R$ 9,000.00 to avoid automatic liquidation, keeping the trade open longer. That can be positive if the price reverses afterward, but it also means that, in a continuous, strong move against the position, the loss can go beyond the initial R$ 1,000.00, eating into a larger share of the account's total capital.

When each model makes more sense

• Isolated margin is usually better suited for those testing a new strategy, wanting to clearly cap the maximum risk of each trade, or trading several positions at once and not wanting one to hurt the others.
• Cross margin can make sense for more experienced traders who manage the risk of the portfolio as a whole, accepting that an individual position gets more room to breathe at the expense of the total available capital.

Risks of unknowingly choosing the wrong model

A common mistake is trading on cross margin without understanding that a single poorly sized trade can put the entire account balance at risk, not just the amount that seemed to be allocated to that position. On the other hand, trading everything on isolated margin without adjusting the amount allocated to each trade can also lead to premature liquidations on short-term moves that would otherwise resolve in the trader's favor.

How to decide in practice

Before choosing between the two models, it's worth simulating scenarios: how much you're willing to lose on a single trade, and what would happen to the rest of the account under each model if that trade went wrong. Beginner traders tend to benefit more from the predictability of isolated margin, since it clearly caps the worst possible scenario per trade, which makes both emotional control and per-trade risk calculation easier — one of the pillars of any consistent capital management plan.

How each model behaves with multiple open trades

The difference between cross margin and isolated margin becomes even more evident when there are several trades open at the same time. With isolated margin, each position has its own loss limit, so one bad trade doesn't affect the performance of the others. With cross margin, one heavily losing trade can eat up margin that would be used to sustain other positions, creating a chain effect: one trade getting worse can force the closure of another that, on its own, was still within a manageable scenario.

Because of that, anyone trading multiple simultaneous positions on cross margin needs to calculate the combined risk of the whole portfolio, not just each isolated trade, something that requires more attention and discipline than trading position by position. With isolated margin, on the other hand, this analysis becomes naturally simpler, since the worst-case scenario for each trade is capped from the start, regardless of what happens to the other positions open on the same account.