> ## Documentation Index
> Fetch the complete documentation index at: https://help.arcus.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# What's the difference between cross and isolated margin?

Cross margin backs every position with your full account collateral, sharing PnL and margin - a winning position in your account can offset a losing position, and liquidation happens only when total equity falls below combined maintenance margin.

Isolated margin allocates a fixed amount to one position: losses can't exceed it, but profits elsewhere can't rescue it. Cross is more capital-efficient; isolated is more contained.

**Arcus runs cross-only at launch**; isolated margin is planned.