Isolated Margin vs. Cross Margin
The Formal Definition
The foundational risk architecture choice in leveraged trading accounts: Isolated Margin allocates a specific, capped amount of capital to a single position, while Cross Margin pools all available account equity as shared collateral across every open trade.
Isolated Liquidation Trigger = Position Equity < Position Maintenance Margin | Cross Liquidation Trigger = Total Net Account Equity < ∑ Maintenance Margins
Cole Barrett's Reality Check
The Unvarnished Bottom Line"Cross margin is great for leverage efficiency, but it can be dangerous for account survival. In a cross-margin account, one bad trade that gaps through its stop loss will happily burn through every single dollar in your account to stay open. Isolated margin puts that position in a quarantine box: if the trade blows up, you lose only what you put in that specific trade."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: An account holding $20,000 in total equity opening a speculative $5,000 leveraged derivatives position that suffers an unexpected 100% crash
| Execution Metric | Isolated Margin Trader | Cross Margin Default Trader |
|---|---|---|
| Fee / Rate | Standard trading spread | Standard trading spread |
| Spread / Buffer | Allocated exactly $2,000 of account equity into an isolated margin position | Default cross-margin setting applied across the entire $20,000 balance |
| Execution / Status | Black swan news event hit; the leveraged position dropped straight to zero and triggered an immediate liquidation | Market crashed through stop levels; the automated risk engine pulled capital from the general account balance to cover the margin deficit |
| Total Cost / Result | Contained downside risk through capital isolation | Suffered total account wipeout on a single trade |
How Brokers Weaponize This Term
When trading leveraged derivatives or CFDs, check your default order settings. If your broker defaults to 'Cross Margin', switch high-risk, volatile speculative trades to 'Isolated Margin' so a sudden market gap cannot drain your entire account balance.
Broker Evaluation Matrix
Cole Approves
Kraken: Provides simple, explicit controls between Isolated Margin and Cross Margin modes with clear liquidation level indicators on every order ticket.
Read Audit →Cole Flags / Avoids
Offshore CFD Dealing Desks: Forces default Cross Margin modes without clear risk warnings, allowing bad positions to drain client balances down to zero.
View Trap Details →Frequently Asked Questions
Why would anyone choose Cross Margin over Isolated Margin?
Cross margin allows winning positions to automatically provide margin support for losing positions, which can prevent premature liquidations in diversified, hedged institutional strategies.
Do traditional stock brokerages use isolated margin?
Standard US stock margin accounts under Regulation T operate on a cross-margin basis across all marginable securities held in that specific account.