Template:M summ 2018 CSD 3(c)(iii)(B)

To follow the contorted logic here you have to keep in mind that the Credit Support Amount (IM) comprises the Margin Amount (IM) — being the amount actually required to be posted as regulatory initial margin under the relevant regulatory regime by the counterparty in question, and the Margin Amount (IA), which is any extra initial margin — what in the old days we used to call an “Independent Amount”