How does variation margin frequency affect residual exposure?

Question

AcadiFi · Accepted Answer

Variation margin (VM) frequency directly determines the margin period of risk (MPR), which is the time from the last successful call to final close-out. Longer MPR means more time for MTM to drift after the last collateral transfer, producing higher residual exposure at default. Regulatory framework treats daily calls as baseline (10-day MPR for non-cleared, 5-day for cleared). Weekly calls roughly triple MPR to 20 business days (10-day drift + 5-day call cycle buffer + 5-day close-out). For a netting set with Brightmoor Continental where 10-day MPR produces $12M peak residual exposure, 20-day MPR approximately produces $12M x sqrt(2) = $17M because exposure diffusion scales with square root of time (under Brownian assumptions). Moving from monthly to daily reduces residual exposure by roughly 50% at the tail. Quantitative benefit: with $17M vs $9M residual PFE for a $1B notional netting set, capital relief from daily calling might be $3-5M annually under Basel's EAD formula. CVA also drops because daily calling reduces integrated EE over time. Regulatory angle: for US dealers in scope, UMR and Dodd-Frank require daily VM exchange for covered counterparties. Not just good practice — it's mandatory for many bilateral trades now. For uncovered pairs (small end-users below thresholds), weekly or monthly may still exist. Operational cost of daily is modest with modern triparty systems; the capital savings dwarf it.

How does variation margin frequency affect residual exposure?

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