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ISDA 1995 English Law Credit Support Annex A Jolly Contrarian owner’s manual™ Go premium Overview — Summary — Premium — See also — Wikitext Crosscheck: →NY OG →Eng OG →NY VM →Eng VM →Eng IM Interest Period in a Nutshell™ The JC’s Nutshell™ summary of this term has moved uptown to the subscription-only ninja tier. For the cost of ½ a weekly 🍺 you can get it here. Sign up at Substack. You can even ask questions! Ask about it here. Original text “Interest Period” means the period from (and including) the last Local Business Day on which an Interest Amount was transferred (or, if no Interest Amount has yet been transferred, the Local Business Day on which Eligible Credit Support or Equivalent Credit Support in the form of cash was transferred to or received by the Transferee) to (but excluding) the Local Business Day on which the current Interest Amount is transferred. The varieties of ISDA CSA Subject 1994 NY 1995 Eng 2016 VM NY 2016 VM Eng 2018 IM Eng Preamble Pre Pre Pre Pre Pre Interpretation 1 1 1 1 1 Security Interest 2 - 2 - 2 Credit Support Obligations 3 2 3 2 3 Transfers, Calculations and Exchanges - 3 - 3 - Conditions Precedent, Transfer Timing, Calculations and Substitutions 4 - 4 - 4 Dispute Resolution 5 4 5 4 5 Holding and Using Posted Collateral 6 - 6 - 6 Transfer of Title, No Security Interest - 5 - 5 - Events of Default 7 6 7 6 7 Rights and Remedies 8 - 8 - 8 Representations 9 7 9 7 9 Expenses 10 8 10 8 10 Miscellaneous 11 9 11 9 11 Definitions 12 10 12 10 12 Elections and Variables 13 11 13 11 13 Resources and Navigation Index: Click ᐅ to expand: CSA

Comparisons

Some development from the OG to the 2016 VM CSA that came about when ISDA’s crack drafting squad™, bless them, contrived in Para 5(c)(ii) to design an option no-one in their right mind would have wanted, namely to choose between Interest Transfer — in which you can have interest that accrues on your Credit Support Balances periodically paid to you — or Interest Amount, in which interest accruals are added to the Credit Support Balance, effectively folding all that into the weft and warp of daily transfers that you will be making anyway.

To be fair to them, the OG only contemplated transfer of accrued interest, which in the context of a modern, daily margined swap business, is barking mad, so at least having the option to just capitalise interest is better than not having it.

But better still would be just straight out capitalising interest, with no option to transfer it. Perhaps this is just me.

Basics

Sometimes known as a “calculation period”, a more general term that can refer to other, non-interest-related determinations, an “interest period” is the space in time between interest payments on an interest-bearing financial instrument. Common ones: annual and semi-annual (especially for fixed rate products, since QED the interest rate doesn’t periodically change so there’s no particular market risk consequence for paying interest more frequently and operationally it is a hassle). Now there is a credit risk consequence, credit being a function of duration, but it is, all told, at the short end and it relates to interest and not principal.

Anyhow: fixed rates tend to pay annually, semi-annually or quarterly and floating rates, being path-dependent and more susceptible to intra-period volatility, are more commonly, monthly, weekly or daily.

You may see some fastidious operations teams asking to modify this to be a calendar month thing. You have to wonder why.

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See also

“Interest Period” as it appears in: 94 NY CSA — 95 English CSA — 2016 NY VM CSA — 2016 English VM CSA — 2018 English IM CSA