Cross Margin vs Isolated Margin: Which Should You Use?

Every perpetual futures position has collateral behind it, and venues make you choose how that collateral is organized: isolated, where each position gets its own allocation, or cross, where your whole account balance stands behind every position. The setting determines how much of the account is available to absorb a loss.

This article assumes you know what margin and liquidation are. If perps are new territory, spot trading vs perpetual futures covers both.

The one-sentence versions

Isolated margin caps each position’s loss at the collateral you assigned to it. The position can be liquidated more easily because only its own allocation defends it, but the rest of the account is protected.

Cross margin lets every position draw on your full available balance. Each position is much harder to liquidate, because your whole account absorbs its drawdown, but a position that does go down can take the account with it.

The trade is symmetric: isolated converts account risk into per-position fragility; cross converts per-position resilience into account risk.

The same trade, both ways

You have $5,000 on the venue and open a $10,000 BTC long at $100,000 with $1,000 of initial margin (10x).

Isolated ($1,000 assigned): the position can absorb roughly $1,000 of adverse movement, about a 10% drop, so liquidation sits near $90,000. BTC falls 12%? You lose $1,000, and the other $4,000 never noticed. Your maximum loss was decided the moment you opened the trade.

Cross: all $5,000 backs the position, so it survives until losses approach $5,000, roughly a 50% drop, liquidation near $50,000. Far more breathing room. But the number you put at risk is now $5,000, and you decided that implicitly, by mode selection, rather than explicitly by sizing.

Same entry, same size, same leverage, same market. The difference is how much collateral can be consumed before liquidation.

When to use each mode

Isolated suits positions that should be allowed to fail. Directional bets, experiments, anything high-leverage, anything you’d describe as “a punt.” The mode forces explicit sizing: deciding the allocation is deciding your max loss. Most traders running independent, uncorrelated positions are better served here, because one thesis being wrong shouldn’t bill the other ones.

Cross suits positions that belong together. Hedged structures, long spot and short perp, or offsetting pairs can benefit when one leg’s gain supports the other leg’s loss. It also suits actively managed books where someone monitors margin across the whole account.

The failure mode to avoid is picking cross casually, because liquidation feels further away, without registering that the extra breathing room is collateralized by everything you have. Funding drag compounds this on long-held positions: payments come out of the same shared pool that’s defending every trade (what funding does over time).

A decision rule

Ask one question per position: “If this trade goes maximally wrong, what am I willing to have lost?”

• If the answer is “the amount I put in it” → isolated, and the allocation is your answer.
• If the answer is “it can’t go maximally wrong, because the other leg offsets it” → cross, with active monitoring.
• If the answer is “it won’t go maximally wrong” → that’s not an answer; that’s the assumption liquidation engines are built on. Use isolated.

The deeper mechanics, initial vs maintenance margin and exactly when liquidation triggers, are in our help center: margin and liquidation.

Where grids fit in this picture

None of this machinery applies to Anello’s grid bots, which run on Hyperliquid spot markets with no margin mode or liquidation price. A grid can end up holding inventory below the range while waiting for price to recover (how grids work); spot prevents that inventory from being force-closed. Margin modes only apply to perp positions.

Nothing in this article is financial advice. Leveraged positions can be liquidated; both margin modes can lose money.