Cross vs Isolated Margin: Which Should You Use?
Margin mode determines how your collateral is shared — or isolated — across positions. The choice affects liquidation behavior, capital efficiency, and risk bleed between trades. This guide explains each mode with concrete examples and offers a decision framework based on your trading style.
Cross margin: shared collateral, shared fate
Under cross margin, every position in your trading account shares a single collateral pool. If you have $10,000 of USDC and open three different perpetual positions, all three draw from that same $10,000. A losing trade's drawdown reduces the buffer for your other positions, pushing their liquidation prices closer.
The benefit is capital efficiency. You don't have to pre-allocate funds to each position; winning trades can subsidize losing ones, and positions partially hedge each other automatically. If you're long ETH and short SOL, their unrealized PnLs offset partially — your account sees the net exposure, not the gross, and margin requirements reflect that.
The risk is correlation-day blowup. In a sudden broad market crash, most crypto assets move together. Your 'diversified' cross-margin book can experience simultaneous losses that together exceed the collateral pool, leading to cascading liquidations across all positions. Cross margin rewards disciplined portfolio construction and punishes careless stacking of correlated trades.
Isolated margin: ring-fenced positions
Isolated margin dedicates a fixed amount of collateral to a single position. The position can only use that allocated amount; a total loss affects only that margin, leaving the rest of your account untouched. This is the risk-management equivalent of sealing off watertight compartments in a ship.
The tradeoff is lower capital efficiency. If you allocate $1,000 to a 10x long on SOL, the full $1,000 sits locked in that position even if it's profitable. You can't automatically deploy unrealized gains elsewhere; you have to actively close or reduce to free them. Multiple isolated positions require multiple collateral allocations, increasing total capital committed.
Isolated margin also has a closer liquidation price for any given leverage because the buffer is smaller. With $1,000 isolated at 10x, you have just $1,000 against losses. In cross margin, the same 10x position could draw from your entire account if needed (assuming no other drawdown), tolerating larger temporary drawdowns before liquidation.
A concrete example
You have $5,000 in your trading account. You open a 10x long on ETH worth $10,000 position size, requiring $1,000 margin. ETH drops sharply.
Under cross margin, your $1,000 loss is absorbed by the full $5,000 pool. Your remaining equity is $4,000; the position continues with more than enough buffer. No liquidation, no additional action needed.
Under isolated margin at $1,000 allocation, that same $1,000 loss consumes most of your isolated margin. You're close to liquidation on this position even though the rest of your account is untouched. A small further move liquidates the position for the full $1,000, but your remaining $4,000 is safe and available.
Both outcomes have merits. Cross prevented the liquidation but risked more account equity. Isolated contained the damage but gave up the position earlier. Which is 'better' depends entirely on whether the setup was correct — if ETH recovers, cross wins; if ETH keeps falling, isolated wins.
When to use each
Use cross margin when you maintain a diversified book of trades with genuinely uncorrelated or hedging logic, and you want maximum capital efficiency. Market makers, delta-neutral strategies, and experienced swing traders benefit from cross.
Use isolated margin when you're testing a high-conviction directional bet with a clear maximum acceptable loss, or when you're trading an asset with unusual risk (low liquidity, high volatility). Isolated is also the right mode when you have multiple traders or strategies sharing an account and need strict separation.
A practical rule: if you can't list the specific reason for each open position and its correlation to others, you probably shouldn't be running them under cross margin. The capital efficiency is not worth the risk of a correlated drawdown you didn't anticipate.
Unified accounts and HIP-3
Tenbagger supports unified accounts, where your Spot USDC balance counts as collateral for perpetual trading automatically. Instead of moving funds between Spot and Perp manually, the system treats them as one pool. This is distinct from cross versus isolated — unified changes what counts as collateral; cross/isolated changes how that collateral is shared across positions.
You can still choose isolated margin for specific positions within a unified account. The unified system provides the collateral; the margin mode provides the allocation rule. Keep this distinction clear when planning: 'Am I using my Spot balance too?' is a unified-account question; 'If this trade loses, does it affect my other positions?' is a cross/isolated question.