Template:Csa credit support amount calculation

Calculating your {{{{{1}}}prov|Credit Support Amount}}

Superficially things are quite different between the 1995 CSA and the 2016 VM CSA, but this all boils down to the fact that the 2016 VM CSA is meant to be a zero-threshold, variation margin-only affair, so the concepts of Independent Amount and Threshold, both of which confuse the 1995 CSA, aren’t there to get in the way. Unless you go and put them in anyway, as we shall see...

1995 CSA

How the IA contributes to the Credit Support Amount — being the amount of credit support in total that one party must have given the other at any time^[1] under the 1995 CSA can be mind-boggling.

It pans out for a Transferee like so:

The Transferee’s Exposure: the net mark-to-market value the Transferor would owe the Transferee under all outstanding Transactions if they were closed out (not counting, of course, the 1995 CSA itself). Call this E_Tee.
The Transferor’s Independent Amount: The total Independent Amount Transferor must give the Transferee we will call IA_Tor. You can add this to the Transferee’s Exposure, but then you must remember to deduct ...
The Transferee’s Independent Amount: Any Independent Amount the Transferee has to pay the Transferor. Call this IA_Tee. ^[2]. Lastly don’t forget to take into account ...
The Transferor’s Threshold: Any Threshold that applies to the Transferor being the Exposure it is allowed to represent before it has to post variation margin in the first place.

This leaves you with a formula for a Transferee’s Credit Support Amount as follows: Max[0, (E_Tee + IA_Tor - IA_Tee + Threshold)].

Let’s plug in some numbers. Say:

The Transferee’s Exposure is 10,000,000
The Transferor’s Independent Amount IA_Tor is 2,000,000
The Transferee’s Independent Amount IA_Tee is 0
The Transferor’s Threshold is 5,000,000

Your Credit Support Amount is therefore the greater of zero and 10,000,000 + 2,000,000 - 0 + 5,000,000) = 7,000,000.

Now, whether you have to pay anything or receive anything as a result — whether there is a Delivery Amount or a Return Amount, in other words — depends whether your Credit Support Amount is greater or smaller than your prevailing Credit Support Balance, by at least the Minimum Transfer Amount.

2016 VM CSA with no IA amendment

Since the 2016 VM CSA assumes there is no Independent Amounts and no Thresholds, it is quite a lot easier. It is just the Exposure. So much so, that there isn't even a concept of the Credit Support Amount under the 2016 VM CSA, unless you have retrofitted one, and who in their right mind would do that?

Oh.

You have, haven’t you. You’ve gone and co-opted the Credit Support Amount (VM/IA) concept in your Paragraph 11 annex. Yes you did. No, don’t blame your credit department; don’t say you were just following orders. You did it.

2016 VM CSA with a customised IA amendment

Never mind. Well, just for you, the formula is a sort of half-way house: Under this unholy bastardisation of a 2016 VM CSA, a Transferee’s Credit Support Amount will be: Max[0, (E_Tee + IA_Tor - IA_Tee)].

↑ As opposed to the amount required to be transferred on that day, considering the “Credit Support Balance” the Transferee already holds — that’s the Delivery Amount or Return Amount, as the case may be.
↑ There’s something faintly absurd both parties exchanging Independent Amounts by title transfer — they net off against each other — but that’s as may be. Stupider things have happened. SFTR disclosure, for example.

[1] As opposed to the amount required to be transferred on that day, considering the “Credit Support Balance” the Transferee already holds — that’s the Delivery Amount or Return Amount, as the case may be.

[2] There’s something faintly absurd both parties exchanging Independent Amounts by title transfer — they net off against each other — but that’s as may be. Stupider things have happened. SFTR disclosure, for example.

[1]

[2]