CCP Margin Procyclicality and Liquidity Planning
A clearing member clears EUR 12bn notional of interest rate swaps for 40 clients, with maturities from 5 to 30 years. The CCP uses a historical VaR initial margin model with a five-year lookback and 99.5% confidence, plus a stress add-on. In a recent stress event the CCP doubled initial margin over five days. The member’s liquidity buffer is EUR 180m, and its worst previous five-day margin call was EUR 120m. The member’s risk team finds that the lookback window included an unusually low-volatility period and that the stress add-on was calibrated to a 2011 scenario. Client collateral is mostly government bonds, but 30% is corporate bonds with a 15% haircut. The member must decide whether to raise client margin, reduce positions, or increase its liquidity facility. Clients have threatened to move business if margin rises.
1. Assess the main drivers of the margin increase and whether the EUR 180m liquidity buffer is adequate.
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The margin increase has several drivers. A historical VaR model with a five-year lookback is procyclical: when low-volatility observations drop out of the window, measured risk rises even if current volatility is unchanged. The stress add-on was calibrated to 2011 and may not reflect the recent shock, so the add-on may be understated. The 99.5% confidence means the CCP is targeting a tail event, and a doubling over five days is plausible when volatility jumps.
The buffer of EUR 180m is not clearly adequate. The worst previous five-day call was EUR 120m, but the current event has already doubled margin, which could take the call above EUR 180m. The buffer should cover the stressed call plus intraday variation margin, same-day settlement, and a further increase before the member can reduce positions. The 15% haircut on corporate bonds may also be too low if those bonds become illiquid. On the facts, the member should treat the buffer as likely insufficient and plan for a larger facility or a position reduction.
2. Recommend actions and discuss the trade-offs, including client reaction.
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The member has three main levers. Raising client margin passes the cost to clients and reduces the member’s liquidity gap, but it may cause some clients to default or move business, especially if the increase is large and sudden. Reducing positions through compression or novation lowers future margin and liquidity needs, but it may crystallise losses, reduce franchise value, and be slow to execute. Increasing the liquidity facility preserves the business, but committed facilities are costly and uncommitted lines may be withdrawn in stress.
A combined response is usually best: first, use compression and portfolio netting to cut gross notional; second, raise client margin with clear notice and a phase-in for smaller clients; third, secure a committed liquidity facility sized to a stress that includes a further margin increase. The member should also review collateral haircuts and diversify clearing across CCPs where possible. Client reaction should be managed by explaining that the CCP, not the member, sets the margin model and that the member is protecting both parties from a default.