Reinsurance: What an Insurer Buys by Passing Risk On
Reinsurance is a second contract, made between two insurers. One of them agrees to carry a stated part of what the other has already promised a policyholder, in return for a stated part of the premium. The policyholder is not a party to it and their cover does not change. The insurer that wrote the policy still owes the whole claim, and now holds a claim of its own against the reinsurer.
Every division below is worked again in full. Each of the six requirements named later is an authority's to set, and each of them moves, so each is printed with that authority beside it and no value at all. A guessed value would be wrong, and wrong is worse than old. Nobody can tell by looking which of the two is in hand.
Start with why an insurer needs any of this. PoolingBringing many similar risks together so that the average outcome across all of them is steadier than any one of them. The conditions a risk must meet before it can be pooled at all are set out separately. is the arrangement an insurer is built on, and pooling does one job extremely well and two jobs not at all. Pooling narrows the average outcome across a great many similar risks. A thousand policies behave far more predictably than one. Pooling can do nothing about the period in which a great many of those risks go wrong at the same time, and nothing about the single obligation large enough to matter entirely on its own. Both of those sit outside what pooling reaches.
Reinsurance is what an insurer does about the part pooling cannot reach, and it does it by making a contract with another insurer rather than by changing anything at all in the contract it already has with the policyholder.
What is reinsurance, and who are the two parties to it?
Chandrika Life Insurance Limited, invented and a life insurer, writes a policy. From that moment it owes whatever that policy promises, in full, to the person who holds it. The obligation to the policyholder is contract one, and it is now fixed.
A reinsurer is another insurer, one that takes on part of what a first insurer has already taken on. Chandrika Life Insurance then makes an entirely separate contract with a reinsurer. Under contract two, the reinsurer agrees to carry a stated part of the obligation created by contract one, and receives a stated part of the premium for doing it. The policyholder is not a party to contract two, and contract one is not altered by a single word of it. Those two facts are the whole foundation of what follows, and almost everything people get wrong about reinsurance comes from letting one of them slip.
Here is the everyday version. Ten shops share one mall, and between themselves they agree that if any one of them has a catastrophic month, the other nine will each carry a slice of it. The agreement between the shops is real and it matters. From the landlord's point of view it is also invisible. A shopkeeper who has promised to carry a slice of a neighbour's bad month still owes the landlord the whole of their own rent, on the day it falls due, and the landlord never has to know that the second arrangement exists. Reinsurance sits in exactly that position: a genuine contract, running alongside the first one, and completely irrelevant to the person on the other side of the first one.
Who does the policyholder claim against once the risk has been reinsured?
Chandrika Life Insurance Limited, and nobody else. A claim arrives at Chandrika Life Insurance, is decided by Chandrika Life Insurance, and is paid by Chandrika Life Insurance in full. Payment of that share by the reinsurer to Chandrika Life Insurance is settled between the two insurers, and it has no bearing whatsoever on what the policyholder is owed or when.
Reinsurance does not move the obligation. Reinsurance adds a second obligation running the other way. That sentence is the one worth carrying away. Before the cession there was one promise, made by the insurer to the policyholder. After it there are two: the first one, entirely unchanged, and a new one made by the reinsurer to the insurer.
Say the same thing in the language of a balance sheet and it gets sharper still. The reinsurer's promise is an asset of the insurer. The promise is not a reduction of the insurer's liability. The amount owed out to policyholders, which is the great bulk of what an insurer carries and sits in its policyholder fundsMoney set aside for obligations belonging to the people who bought the policies rather than to the insurer. Who it belongs to, and what becomes of it while it waits, is covered separately., has not gone down by a rupee. Something has been added on the other side of the sheet instead. The difference between those two descriptions sounds like a technicality. One of them is a claim that can fail, the other is a debt that has been extinguished, and only one of those two things has actually happened.
A policyholder makes a claim on a policy the insurer has reinsured. Who does the policyholder claim against?
Which two lines move when risk is ceded, and why must they move together?
Two lines in the reported result move, and they move as one arrangement rather than as two events. Part of what the policyholders paid goes across to the reinsurer, so premium ceded leaves the premium line. Part of what is paid out is owed back by the reinsurer, so claims recoverable comes off the claims line. The remainder on each line has a name used from here on: the premium after cession is net premium, and the claims after recovery are net claims.
Read one of those two movements without the other and the resulting figure describes nothing at all. The mistake is not a subtle one, and it is the most common way the arithmetic goes wrong in practice. The two lines sit in different places in a reported result, and a reader picking figures off a statement has no particular reason to notice that they belong to each other. A net numerator sitting over a gross denominator flatters the insurer by exactly the risk it passed on, and the reverse understates it by exactly the same amount.
The household version is a wedding. A family takes a contract to feed four hundred people and subcontracts the sweets. The money for the sweets leaves the family's side of the ledger and so does the cost of making them, and both of those happened because of one decision. Count the money going out and forget the cost coming off, and the wedding looks ruinous. Count the cost coming off and forget the money going out, and it looks like the best night the family ever had. Neither figure is a lie, and neither of them describes the evening.
An insurer's premium line falls by a tenth after a cession and its claims line is left exactly where it was in the accounts. What has gone wrong?
Answer this one before the arithmetic arrives. Suppose Chandrika Life Insurance Limited passes one rupee in every ten of its business across, proportionally. What happens to its claims measured as a share of its premium?
Why does a proportional cession leave the underwriting reading exactly where it was?
Now the arithmetic, and it is worth doing slowly because the answer is the least intuitive thing in this whole subject. Suppose Chandrika Life Insurance Limited cedes one rupee in every ten, proportionally. The same tenth of every single policy goes across to the reinsurer.
Over the stated period the policyholders paid Rs 15,600 crore of total premium received, made up of Rs 5,200 crore of new business premium and Rs 10,400 crore of renewal premiumPremium that turns up this period because a policy bought some years back is still going. Why the split between the new half and the renewal half matters so much on a life insurer is covered separately.. A tenth of that is Rs 1,560 crore ceded, leaving net premium of Rs 14,040 crore. Claims are Rs 6,720 crore, a tenth of which is Rs 672 crore recoverable, leaving net claims of Rs 6,048 crore.
| The stated period | Before the supposed cession | Taken across | After it |
|---|---|---|---|
| Premium | Rs 15,600 crore | Rs 1,560 crore | Rs 14,040 crore |
| Claims | Rs 6,720 crore | Rs 672 crore | Rs 6,048 crore |
| Claims as a share of the premium beneath them | 43.08 per cent of total premium received | one tenth of each | 43.08 per cent of net premium |
Do the two divisions rather than quoting them. Rs 6,720 crore over Rs 15,600 crore is 43.08 per cent of total premium received. Rs 6,048 crore over Rs 14,040 crore is 43.08 per cent of net premium. Both numbers fell by a tenth and the reading between them did not move by a hundredth of a point.
Proportional means exactly that, and the result is worth sitting with. The same factor was taken out of the top of the fraction and out of the bottom of it, so the factor divides out and the fraction is left where it started. The algebra in one line: a tenth off both sides of a division is nine tenths over nine tenths, and nine tenths over nine tenths is one. Every arrangement of this shape behaves the same way at any share, and the control below confirms it.
The reason this matters far beyond the arithmetic is what it rules out. A reader who has just learned that reinsurance reduces what an insurer carries will reach for it as a way of making an underwritingDeciding whether to take a risk at all and what to put on it as a price, before anybody knows what that risk will end up costing. How a price gets set ahead of the cost is covered separately. reading look better. A proportional cession does not do that. The reading is untouched, and anybody who reports an improvement in it after a proportional cession has made an arithmetic mistake somewhere else.
Rs 6,048 crore of net claims sits over Rs 14,040 crore of net premium. What is the reading, and what is its base?
Move the share ceded and watch the marker refuse to move with it
The control moves one thing only: the share of every policy ceded proportionally. The premium bar and the claims bar both come down by that share, the part that goes across is drawn leaving each bar rather than vanishing, and the dashed outline behind each bar is where it stood before anything was ceded. The control opens at one rupee in ten, the share worked above.
Educational illustration. One stated period throughout. The cession is proportional at every setting, taking the same share of every policy and of every claim, and that single assumption is doing all the work here and is exactly why the marker will not move. The recoverable is assumed to be paid in full, and the failure below takes that assumption apart. The terms on which risk may be ceded at all are set by the Insurance Regulatory and Development Authority of India (IRDAI) at irdai.gov.in.
If a proportional cession leaves the underwriting reading exactly where it was, what did the insurer get for the premium it gave away?
If the reading does not move, what did the insurer buy with the premium it gave away?
Not the average. The arithmetic above has already proved as much. A proportional cession takes the same share of a quiet period and of a terrible one, so it cannot possibly change the relationship between what comes in and what goes out. A proportional cession changes the size of every outcome rather than the shape of them.
A proportional cession buys an insurer one thing: a bad period lands on it in a smaller version. Everything is scaled down: the good periods and the bad ones, the premium and the claims, in the same proportion. A smaller version sounds like a modest thing to pay for, but an insurer does not fail because its average was poor. An insurer fails because one period was large enough to exhaust what stood behind it, and a period scaled down by a fifth is a period a fifth easier to stand.
There is a second thing an insurer can buy, and it does a completely different job. Cover that responds only above a stated point takes nothing at all in an ordinary period and a great deal in an extreme one. The shape of the outcomes changes rather than their size. It leaves the quiet periods entirely alone. Cover of that kind is the arrangement an insurer reaches for when the worry is not the general level of claims but the single obligation, or the single event, large enough to matter on its own. Size and shape are the two jobs, and no arrangement does both.
What new risk appears the moment risk is ceded?
Here the subject turns from arithmetic into judgement.
Before the cession, Chandrika Life Insurance Limited held risk on the policies it had written. After the cession, Chandrika Life Insurance holds risk on the policies it kept and it also holds risk on the reinsurer. Ceding does not remove a risk. Ceding exchanges one risk for a smaller version of that risk plus a new risk of a completely different kind.
Look at the Rs 672 crore recoverable in the worked supposition and ask what it actually is. The recoverable is not money. The recoverable is an amount that somebody else has promised to pay, and the reinsurer is now a counterpartyWhoever stands on the other side of a contract and has to perform for it to be worth anything. The word carries no judgement about them, only the fact that one party's outcome now depends on another's. whose performance Chandrika Life Insurance depends on. If that promise is not kept, Chandrika Life Insurance still owes the policyholders the whole Rs 6,720 crore, out of its own net worthThe insurer's own capital, meaning what would be left if everything owed to everybody else were settled. Net worth is a much smaller number than the money an insurer holds for policyholders., and the reinsurer's failure is not a defence against a single rupee of it.
Here is the timing, and it is arranged in the least convenient way possible. The recoverable is at its largest immediately after the period in which a great many things went wrong at once. A reinsurer carries slices of many insurers' bad periods, and those bad periods have an unpleasant habit of arriving together. So a reinsurer is under the most strain of its own in precisely that period. So the amount the insurer is owed peaks in the same period as the doubt about whether it will be paid. The exposure is smallest when it does not matter and largest at the only moment anybody would care.
The credit an insurer is allowed to take for risk it has ceded, at the point its own position gets measured, is a matter for IRDAI at irdai.gov.in. The rule moves. A rule of that kind quietly stops being true while continuing to sound entirely convincing. Naming the authority survives a revision; naming a value does not.
An insurer cedes a large share of its book and reports much smaller net claims as a result. Name the risk it has taken on that it did not have before.
What are the two shapes a cession takes, and what does each one respond to?
Every level in either shape belongs to a contract and to the rules governing what may be ceded at all, so the two shapes below carry no level of their own.
The first is a stated share of everything. The reinsurer takes the same proportion of every policy and of every claim, precisely the arrangement worked above. A stated share is easy to describe, easy to administer, and entirely predictable in its effect: everything gets smaller by the same factor and nothing else changes.
The second is cover that responds only above a stated point. The reinsurer pays nothing until a loss passes a level agreed in advance, and pays above it. Nothing at all happens in an ordinary period. A great deal happens in an extreme one.
The first shape changes how big every outcome is. The second changes which outcomes reach the insurer at all. Hold those two sentences apart and the rest of the subject stays tidy.
One caution about the number used throughout. The one rupee in ten is chosen so the arithmetic can be seen happening, and it is not a permitted share of anything. The share that may be ceded and the point at which cover of the second shape responds are both settled elsewhere, and both are named in the table below with nothing written in beside them.
An insurer wants cover that costs it nothing in an ordinary period and responds only to a genuinely extreme one. Which of the two shapes is that, and what does it give up?
Who sets the terms on which risk may be ceded at all?
Six things passed over above are decided by somebody other than the two insurers signing the contract, and every one of them is set by IRDAI. The table below collects them, drawn as rows with the authority printed inside them and nothing whatsoever in the value column.
An empty row is more useful than a filled one, and the reason is worth stating plainly. Each of these six moves on its own timetable. A value written into a row stops being true the moment it is revised, and then goes on looking perfectly authoritative. The combination is the dangerous one. Stale announces itself. False while still wearing the appearance of a fact does not. Go instead to the site printed inside the row and read what stands there today. The trip takes a few seconds, and it is the only route that hands back an answer worth relying on.
What is decided elsewhere, and who decides each one
| What is decided | Who decides it | The value |
|---|---|---|
| The conditions attaching to risk passed on to a reinsurer, and the order in which cessions are offered | IRDAI, irdai.gov.in | |
| The registration of a reinsurer, and of a branch of one | IRDAI, irdai.gov.in | |
| The credit an insurer may take for risk it has ceded, when its own position is measured | IRDAI, irdai.gov.in | |
| The margin an insurer holds above the value placed on the policies it has written | IRDAI, irdai.gov.in | |
| How the reserve held against policies already written is valued | IRDAI, irdai.gov.in | |
| The form in which premium, claims and expenses are reported publicly | IRDAI, irdai.gov.in |
Six rows, one authority printed inside every one of them, and not a single value anywhere in the table. The arrangement described above does not depend on any of the six: a second market becomes six new rows in this table rather than a rewrite of the argument. The valuation in the fifth row is the work of an actuaryThe person who puts a value today on obligations that fall due far in the future, using assumptions about how long people live and what money earns in the meantime., and how that valuation is done is settled by the authority in the row.
Where this shows up in somebody's working day
Three habits come out of everything above. None of them is a definition anybody has to memorise: each one is a small physical thing a person does with a document in front of them.
An analyst reads the net figure for what the insurer kept and the gross figure for what it still owes, and never lets one stand in for the other. That is a mechanical two step check, not a judgement. Find the gross claims line, find the recoverable, and hold both in view at once. The gross figure answers what could come out of the door. The net figure answers what was left after somebody else's promise. The two figures answer different questions, and the moment they get merged into one number, one of the two questions has quietly gone unanswered.
A lender or an analyst looking at a heavily ceded book asks who is on the other side of the cession before asking anything else about the numbers. A book that has passed on a great deal of what it wrote has a great deal riding on somebody who is not in the accounts at all. The habit is to notice the size of the recoverable relative to the insurer's own capital, and then to notice that neither the size nor the identity of the counterparty is visible in a ratio. The instinct is the same one a person has about a guarantor: the promise is only as good as whoever made it, and the guarantor has to be looked at separately.
Anybody quoting an underwriting reading says gross or net in the same breath, every single time. This is the smallest habit on the list and it prevents the largest class of error. Two readings on this insurer both come to 43.08 per cent and they describe different quantities, one measured on total premium received and one on net premium. Five extra words carried alongside the figure keeps them apart permanently, and nothing else does.
Reading the recoverable as though the obligation had gone
Here is the mistake, and what makes it dangerous is that every step of the arithmetic behind it is correct. A reader works through the supposition above, sees net claims of Rs 6,048 crore, and writes that down as what Chandrika Life Insurance Limited is on the hook for. The subtraction was right. The reading of it is wrong.
The Rs 672 crore that is missing from that figure has not disappeared anywhere. The Rs 672 crore is an amount a third party has promised to pay, and until it is actually paid, Chandrika Life Insurance owes its policyholders the whole Rs 6,720 crore. The wrong reading, in one line and easy to recognise once named: reinsurance reduced what the insurer owes. It did not. Reinsurance added somebody who owes the insurer.
The mistake costs an exposure figure too small by exactly the recoverable, and too small by most in exactly the period where the shortfall matters. Work the timing through. The recoverable is at its largest after the period in which a great many things went wrong at once. The reinsurer is under the most strain of its own in that same period, and therefore the promise behind the recoverable is least certain then. So the error is negligible when nothing is happening and at its widest at the only moment anybody would care about it. An error with that shape stays quiet for years, then arrives at full size on the worst possible day. As a warning it is close to useless.
Who walks into it: anybody who has learned that the net figure is the more conservative one and carries that habit one step further than it goes. The habit is a reasonable one almost everywhere else in finance, and that is precisely why it survives long enough to do damage here. The error is not carelessness and it is not ignorance, but a good rule applied outside the place it was true.
One line repairs it, and it is worth carrying in exactly these words: on a ceded book, read the net figure for what the insurer kept and the gross figure for what it still owes, and never let one of them stand for both. The two figures are both correct and they answer two different questions, and the whole failure is answering the second question with the first one's number.
Last one. Where is the level a loss must reach before cover of the second shape responds, and where is the share that may be ceded?
Where reinsurance stops and other subjects begin
Settled above: what reinsurance is, where the obligation sits once risk has been ceded, and what the arithmetic of a proportional cession does and does not do to a reading. How much cover an insurer should buy, and from whom, is a separate decision. Which risks an insurer agrees to take, and the price it puts on them, is covered separately. So are the three ratios an underwriting result gets read on, together with the bases each of them is struck on, set out with a calculator alongside. So is what the money sitting with an insurer in the years before a claim falls due actually is, and to whom it belongs. So is the way an insurer makes its earnings from three places at once. The capital test an insurer stands or falls on is settled separately, and it takes one question in particular: what credit is allowed for risk that has already been ceded. Every line above stands on the insurer's side of the contract, so a household buying cover is a subject of its own, approached from the far end of it. A book still paying claims after it has stopped being sold is in run-offThe state of a book of policies that is no longer being sold but is still running out its obligations, sometimes for many years, while claims continue to arrive against it., a subject of its own. And the conditions on ceding, the registration of a reinsurer and the credit allowed for ceded risk all belong to IRDAI at irdai.gov.in. An authority and an address stand above in every place a value would otherwise have gone.
Where each empty row above gets filled in
| Authority | What was looked for | Site |
|---|---|---|
| IRDAI | The conditions attaching to risk passed on to a reinsurer, and the order in which cessions are offered | irdai.gov.in confirmed 23 August 2026 |
| IRDAI | The registration of a reinsurer, and of a branch of one | irdai.gov.in confirmed 23 August 2026 |
| IRDAI | The credit an insurer may take for risk it has ceded when its own position is measured | irdai.gov.in confirmed 23 August 2026 |
| IRDAI | The margin an insurer holds above the value placed on the policies it has written | irdai.gov.in confirmed 23 August 2026 |
| IRDAI | How the reserve held against policies already written is valued | irdai.gov.in confirmed 23 August 2026 |
| IRDAI | The form in which premium, claims and expenses are reported publicly | irdai.gov.in confirmed 23 August 2026 |
| Institute of Chartered Accountants of India | How an amount owed by a reinsurer is presented in a published statement | icai.org confirmed 23 August 2026 |
Chandrika Life Insurance Limited is invented.
Educational material. Not advice on any investment, tax, budget or market position.