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What Is the Difference between Initial Margin and Variation Margin as Used by a CCP?

Initial margin (IM) is the collateral required upfront to open a derivatives position. It is intended to cover the potential loss on the position until it can be liquidated following a default.

Variation margin (VM) is the daily cash flow paid or received to reflect the mark-to-market change in the position's value. IM covers potential future losses, while VM settles current daily gains or losses.

What Is “Pre-Funded Variation Margin” in the Context of Smart Derivatives?
Is Variation Margin Always Paid in Cash, or Can It Be Paid in Other Assets?
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What Is the Difference between Initial Margin and Variation Margin for Futures?