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How Segregated Initial Margin Calls Are Calculated

Article Quant Q&A · Author: Tom Ho
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Summary

The answer explains that segregated margin calls relate to regulatory requirements for initial margin held in a segregated account. The amount to post is described as the positive excess of calculated initial margin over a regulatory threshold: if the calculated amount is below the threshold, no segregated initial margin is due under this rule; if it exceeds the threshold, the excess is posted.

The calculation of the underlying initial margin is determined by a bank’s internal models. The document offers a brief explanation rather than a worked numerical example, and it does not describe non-segregated margin calculations in detail. Its account is specific to the cited US regulatory framing, so the threshold and treatment may depend on applicable rules and can change over time.

Key ideas

  • Segregated initial margin is held in a segregated account under the described US regulatory approach.
  • The required segregated amount is the positive difference between calculated initial margin and the applicable threshold.
  • A bank’s internal model determines the calculated initial margin.
  • The answer gives limited detail about non-segregated margin calls or the broader calculation methodology.

Tags

Fixed incomeRisk management
Full text
# Segregated margin call question


# Segregated margin call question












What means segregated margin call and non-segregated margin call in the example. Why it is calculated that way？ Thank you.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.isda.org/a/zR2gE/Margin-Approaches-New-Edited-August-2022.pdf&ved=2ahUKEwjt25qj3u77AhU9s1YBHdvCARsQFnoECDwQAQ&usg=AOvVaw1NEaztnWaGRHxmjF2ytuBR

## Answer by dm63 (score 1)

https://quant.stackexchange.com/a/74045

Regulatory requirements in the US require the Initial Margin (IM) to be held in a segregated account, so the calculations are describing the associated collateral flows. Essentially the amount of segregated IM required to be posted is max(0, calculated IM - threshold) where threshold is set by the regulators (currently 50mm I believe). The actual amount of Calculated IM is calculated by a bank’s internal models.

Shown in full with attribution under the source's licence. Licence: CC BY-SA 4.0 (Stack Exchange)

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.