How do variation margin calls work during volatile markets?

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AcadiFi · Accepted Answer

Variation margin is cash paid/received to settle MTM changes. End-of-day variation flows automatically as part of the daily settlement. But during stressed days, clearing houses can issue **intraday variation margin calls** to collect losses before the next session.

Intraday calls trigger when large price moves push specific members' accounts below thresholds. The clearing house calculates unrealized P&L at a snapshot (e.g., midday) and issues demands, typically requiring funding within one to two hours.

Example: A commodity trading firm run by Elif Yıldız holds a large copper short. Price gaps up 4% at the London open. By 11 AM New York time, the clearing house issues a $40 million intraday variation margin call. Elif must wire collateral immediately or face forced liquidation of the position.

Variation margin differs from initial margin:

- **Variation margin** = settling actual P&L movement (cash for cash).
- **Initial margin** = security deposit covering potential future exposure.

Variation margin must be paid in eligible settlement currency (usually cash in the contract currency). It cannot be posted as government bonds, unlike initial margin at many CCPs.

Failures to meet intraday calls are how member defaults cascade. The March 2020 oil collapse and the September 2022 UK gilt crisis both featured extraordinary intraday margin calls that strained client liquidity. Risk managers model 'margin-at-risk' alongside value-at-risk for this reason: you can be right on direction yet still be liquidated because you ran out of cash to post.

How do variation margin calls work during volatile markets?

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