Netting: How Many Obligations Become a Single Payment

Netting cancels obligations that point opposite ways, leaving one figure to move where many would have moved. On an invented book of four obligations carrying Rs 150.00/- of gross movement, one net payment of Rs 30.00/- leaves, and Rs 30.00/- is 20.0 per cent of the gross. Netting holds only inside the set of obligations it is defined over, and that set is settled by rule rather than by arithmetic.

Here is the thing worth holding on to before any of the sums arrive. Every obligation in this machinery is a promise that has to be backed first and met afterwards. Two promises pointing in opposite directions between the same two sides do not have to be met twice over. The difference between them is all that actually has to travel. As arithmetic that is so plain it barely needs saying. As an arrangement it is nothing like plain. The difference is only the right figure if a rule says the two promises may be placed against each other, and that rule has to survive the worst day rather than the ordinary one.

What does netting actually do to a day's obligations?

One position holder. One unit of the invented reference asset, carrying an exposure of Rs 2,000.00/-. One ordinary day on which four obligations happen to fall due at once, each of them a day's mark, each sized as a stated percentage move on that same exposure. The four sizes were chosen so the arithmetic would be visible at a glance.

Rs 80.00/- is payableAn amount the position holder has to hand over on the day, as opposed to one coming the other way. on the day, being a 4.0 per cent move on the exposure. Rs 40.00/- is receivable, being a 2.0 per cent move. Rs 20.00/- is receivable, being a 1.0 per cent move. Rs 10.00/- is payable, being a 0.5 per cent move. Now do the two sums that matter, and notice that they are genuinely two sums rather than one sum read twice.

Adding the four without paying any attention to which way they point gives Rs 150.00/-. Rs 150.00/- is the gross: the total quantity of movement the day would generate if every obligation were met on its own terms, four separate instructions, four separate chances for something to go astray. Adding them again, this time honouring the direction of each one, takes away the Rs 80.00/- and the Rs 10.00/-, both of which run out, and puts back the Rs 40.00/- and the Rs 20.00/-, both of which run in. A single payment out of Rs 30.00/- is what is left. Measured against the Rs 150.00/- gross that comes to 20.0 per cent, so 80.0 per cent of the movement the day was going to generate never generates at all.

There is a cleaner way to see where the Rs 120.00/- went, and it is worth walking through slowly because it is the whole picture in one line. The payable side of the book adds up to Rs 90.00/-. The receivable side adds up to Rs 60.00/-. Setting one against the other wipes out the entire receivable side, all Rs 60.00/- of it, and it wipes out a matching Rs 60.00/- slice of the payable side at the same moment. Wiping out both sides together is what setting off means. Two slices of Rs 60.00/- come to Rs 120.00/-, exactly the movement that disappears, and Rs 90.00/- less Rs 60.00/- leaves the Rs 30.00/- that still has to be found.

What are the two different things netting reduces?

Readers run these two together almost every time, and keeping them apart is worth more than the arithmetic above. Netting reduces two quite separate quantities, they have two different audiences inside the arrangement, and only one of the two is the reason netting sits alongside collateral at all.

The first reduction is in what moves. Four payment instructions become one instruction. Fewer things travel, so fewer things can be sent to the wrong place, arrive late, or fail to arrive. Fewer things travelling is a question about plumbing, and the people who care about it are the ones who have to make the day work operationally. The plumbing gain is real, and it is not the interesting one.

The second reduction is in what has to be backed at a moment. Think about the promise from the outside, the way somebody deciding how much collateral to ask for has to think about it. Without setting off, the position holder is a party owing Rs 90.00/- while separately expecting Rs 60.00/- from the other direction. With setting off, the position holder is a party owing Rs 30.00/-. The Rs 90.00/- promise and the Rs 30.00/- promise are two different sizes of promise, and the second reduction is the one this machinery is built around. Netting therefore belongs beside a discussion of collateral rather than beside a discussion of payments.

Here is the everyday version, and it is worth sitting with. A wedding caterer has a hall to pay for on Saturday and a client instalment coming in on Saturday. If the hall and the client are the same organisation and there is an agreement to settle one figure, the caterer needs to arrange only the difference. If they are two separate organisations, the caterer needs the full hall payment in hand on Saturday morning whatever the client has promised. The catering is identical in both cases. The size of the promise the caterer has to be good for is what differs.

What is the set that netting is defined over?

Netting is never simply an operation. Netting is always an operation over a defined set: these obligations, between these parties, of this kind, falling due in this way. Change the set and the answer changes, without a single number in the arithmetic changing. The set is the part almost nobody states, and it is the part that decides whether the figure at the bottom of the column is worth anything at all.

An amount receivable from one party does not reduce an amount payable to a different party, and no amount of correct addition will make it do so. The reason is not legal subtlety. The reason is that one obligation cannot be paid with money that has not been received from somebody else. The money is not there. An expectation of it is not a payment instrument.

The everyday version comes from a food stall outside one office building. The stall is owed money by a regular customer who settles at the end of the month, and the stall owes money to the supplier who delivers vegetables every morning. Adding the two together gives a comforting small number. The supplier does not accept it. The supplier wants the invoice paid this morning, and the customer's promise, however good, settles nothing that the supplier has asked for. Two separate problems that look like one problem when written in a single column.

The width of the set is also where the difference between a bilateralAn arrangement struck straight between two sides, with nobody sitting in the middle of it. arrangement and a multilateralAn arrangement in which more than two sides are joined through one central point, rather than to each other one pair at a time. one starts to matter. The central point in a cleared arrangement is precisely what makes a wide set possible. Put one body in the middle of every contract, facing each side on its own, and the position holder stops dealing with a scatter of unrelated counterparties. The replacement of the original promises by promises to a single body has a name, novationThe step in which one central body replaces the original pair of promises with two fresh promises made to itself., and how the body doing it is funded and governed is covered separately. Only the consequence matters at this point: the set gets wider, and a wider set is what lets more obligations be placed against each other.

Why is netting a rule before it is arithmetic?

The sums above take a few seconds and they carry no information on their own. The Rs 30.00/- takes its meaning from whether the setting off actually holds at the one moment somebody needs it to hold, and that moment is never the calm afternoon on which the column was added up. The moment is the day one of the parties has stopped paying.

Picture it going the other way. Somebody unwinding a failed party's position separates the obligations rather than combining them. The failed party's payables are demanded in full and immediately. The failed party's receivables become a claim like any other claim, joining a queue, ranking as unsecuredBacked by nothing set aside in advance, so whatever is recovered depends on what happens to be left over. alongside everybody else who is waiting. The moment the obligations can be separated in that way, the figure that mattered was never Rs 30.00/- and was always the Rs 90.00/- payable side. The Rs 90.00/- is the amount that gets demanded while the Rs 60.00/- is still waiting in a queue.

The word enforceableStill binding when somebody tries to escape it, rather than binding only for as long as everybody stays willing. is therefore doing more work in this subject than any other word in it. An arrangement that works while everybody is comfortable is not an arrangement. The whole point of settling the rule in advance is that it has to bind through an insolvencyBeing unable to meet what has already fallen due, which is the day on which every promise gets tested., when the party with the most to gain from separating the obligations is the party in charge of the estate.

Notice the ordering here. The same ordering repeats all over this machinery. Whoever drafts the rule cannot yet know whose failure it will be tested by, and that ignorance is the point rather than a limitation on it. Draft the rule after the failure and it gets drafted by somebody with an interest in the answer. Draft it beforehand and neither side can bend it towards themselves. The collateral call follows exactly the same ordering for exactly the same reason: it lands early, at a point where the position has not closed and cash can still be raised against it.

How does the whole day work through, line by line?

Everything above in one place, recomputed rather than carried forward, and with every figure saying which of three things it is. Something counts as a price when somebody agreed it, quoted it or worked it out. Something counts as a payment when an account is actually debited or credited by it. Something counts as a net when two directions have already cancelled inside it. Readers run the three together constantly, and the reason is structural: a settlement price and a rupee leaving an account can appear a comma apart on one line while only one of the two ever moves.

Two ratios follow, and each one names the base it is struck on in the same breath. A ratio without its base is a number nobody can check. The Rs 30.00/- over the Rs 150.00/- gross gives 20.0 per cent. The Rs 120.00/- that stays put over that same gross gives 80.0 per cent. Neither ratio is struck on the exposure and neither is struck on the collateral, and reading them as though they were is how a reader ends up believing the position shrank.

And here is the second table, the one worth photographing. Nothing in it moved.

The 8.0 per cent behind the Rs 160.00/- was picked for this guide and holds nowhere outside it. Real collateral requirements come from clearing corporations working under a framework SEBI maintains at sebi.gov.in, they differ by contract and by day, and they move. The invented figure is there for the pair of readings underneath it, and both halves have to be read at once because either one on its own misleads: an exposure of Rs 2,000.00/- standing on Rs 160.00/- posted is 12.50 times, and a 4.0 per cent adverse move of Rs 80.00/- takes 50.0 per cent of what was posted. A move of four per cent in the referenced thing takes half of what was put down, and netting did not change that by one paisa.

What does netting change about the collateral machinery?

Two things, and it is worth being strict about the list. The temptation is to keep adding to it.

The first is that less has to move, so fewer separate payments can fail to arrive. Less movement is the plumbing reduction again, seen from the collateral side: an arrangement with one payment to chase has fewer places to go wrong than an arrangement with four.

The second is that what gets called can be struck on the netted figure rather than on each obligation separately. A call sized against Rs 30.00/- is a different call from four calls sized against Rs 80.00/-, Rs 40.00/-, Rs 20.00/- and Rs 10.00/-. The size of the call changes, and the timing of it does not change at all: the call still comes before the loss does, whatever figure it happens to be struck on. The call arriving before the loss is what makes the arrangement work, and no amount of netting moves it.

Seeing netting as a moment rather than a condition also helps. Obligations gather through the day as marks are struck. At one point they are placed against each other. After that point one payment leaves. Before the moment there are four obligations and no net; after it there is a net and nothing else. Netting is a step in the day, and asking what a book is netted to without asking when is asking about a photograph without saying when the shutter opened.

Look at the strip along the bottom of that drawing rather than at any single setting. The net falls, falls again, and then goes back up. Most readers expect a figure like this to keep improving as more obligations are brought inside the set, and it does not. An obligation only cancels something if it points the other way. The fourth obligation points the same way as the first, so bringing it inside adds to what has to be found. More obligations inside the set does not mean a smaller payment; it means a payment computed over a wider set, and a wider set can produce a smaller payment or a larger one.

What does netting leave completely untouched?

Three things, and a reader coming straight off the arithmetic will assume otherwise about all three, because a figure that has just fallen by 80.0 per cent feels like a figure that describes the position.

The exposure is unchanged. A position standing on Rs 2,000.00/- of the reference asset still stands on Rs 2,000.00/- of it, whatever route the day's payments took. The exposure describes the size the position is referenced to, not the money that moved through an account, and the two are separate quantities that happen to be quoted in the same currency. Note as well that the reference asset hands its holder nothing across the whole time it is held, so there is no stream of receipts sitting behind the exposure either.

The collateral put up is unchanged in kind. Rs 160.00/- rests on a percentage invented for teaching, SEBI fixes the real one, and the real one moves. The 12.50 times of exposure standing on that collateral is unchanged, and a 4.0 per cent adverse move of Rs 80.00/- still takes 50.0 per cent of what was put up. Not one of those readings responds to how the day's payments were arranged.

And the price of the reference asset itself takes no interest in any of it. The reference asset price does what it does; netting is a fact about the obligations that follow from a position, not a fact about the position.

Netting is about obligations, and a position is not an obligation. Forget that and a reader who has just watched Rs 150.00/- fall to Rs 30.00/- concludes that their position got smaller when only their payment did. Say the two words out loud if it helps: payment, position. One of them changed today. The other one did not.

When is the net the wrong number to look at?

Two cases, and both of them are plain once the set has been understood.

The first is the one already worked above. Where the setting off would not hold on the day it is needed, the gross side is the figure and the net is a description of a comfortable afternoon. Nothing about the arithmetic was wrong. The arithmetic was describing a set that did not survive contact with the day it was built for.

The second is sharper. In this case there is no single figure at all. Where the obligations being netted sit with different parties, combining them produces a number that corresponds to nothing. There are two separate promises. One of them may be met and one of them may not, and their difference is not a quantity anybody can pay or receive. Writing it down does not bring it into existence.

Which is why a reader handed a net figure with no statement of the set it was struck over has been handed something nobody can check, including the person who wrote it down. The row that names the set is the one to look for. On a statement it is often not there at all, and its absence is the most informative thing in the document.

What figure about netting can never be produced?

A worked book of four obligations can show a mechanism and can never measure one. Not one participant, not one holding, not one day of obligations that anybody actually owed stands behind the sums above. The four obligations are stated percentage moves on a single exposure, sized so the arithmetic stays legible rather than because amounts of that shape have ever been observed anywhere.

The missing history has a consequence worth stating flatly rather than leaving as a gap. How netting behaves can be shown in full. How much netting achieves cannot be shown at all, and a figure for it would need a history of real obligations that no worked example has. A figure quoted elsewhere for the share of gross obligations netting removes in some market rests on a history of real books, and no worked example can confirm or contradict it. The mechanism and its boundary are what is on offer, a smaller claim and a more durable one.

What stays unanswered once the mechanism is understood?

Does a day that moves Rs 30.00/- instead of Rs 150.00/- make a position safer to hold? The arithmetic worked above cannot say. The collapse happened in the payment lane while the position itself sat exactly where it started. Understanding how a set works is not a reason to be inside one.

What would somebody need in front of them first? The job the position is doing, a fact about the holder rather than about the obligations. The set the netting was struck over, and whether that setting off survives a day when one side stops paying. What already stands behind the position, and what more could be raised by tomorrow morning if it had to be. The receipts on the account's very worst day, a different question from the receipts on an ordinary one.

One last rule about vocabulary prevents a specific misreading. Two labels stay attached to every quantity here: exposure where a figure is what a position stands on, notionalA headline size used purely as a multiplier. Nobody hands the amount over; it only scales what does move. where the figure is only a multiplier. Prices carry a second pair of labels, spot priceWhat the thing itself changes hands for today, as against a price fixed now for a later date. for today and agreed price for a later date. The exposure the collateral is struck on here is Rs 2,000.00/- a unit. Holding the reference asset returns nobody a single paisa in the meantime. Keeping those labels attached is what stops a reader carrying a payment into a sentence about a position, and that single error is the one this whole subject circles.

The reference asset, the position holder and the four obligations worked above are invented.
Educational material. Not advice on any investment, tax, budget or market position.