Deductible and Co-Payment: The Two Ways You Share a Claim

A deductible is an amount the household pays before the policy pays anything. A co-payment is a share of what the policy would otherwise pay, taken on every claim. One is a threshold and the other is a proportion, so a deductible costs most on a small claim and a co-payment costs most on a large one, and neither is simply the better device.

A settlement letter with an unexpected line on it is the usual reason for arriving here. Neither of these two devices is a penalty and neither is a decision anybody made about a claim after it happened. Both are written into the contract before a single rupee is ever claimed, both are priced into what the cover costs, and both operate by arithmetic that does not know whose claim it is. A co-payment or a deductible appearing on a settlement is the contract working exactly as it was drafted, not a judgement about the claim or about the household that made it. The contract working as drafted is a plain fact rather than a comfort, and it is the ground everything that follows rests on.

Both devices exist for the same reason, and this is the sentence everything else rests on. An insurer that carries every rupee of every claim has to price for every rupee of every claim, including the very small ones that arrive constantly and cost almost as much to process as they do to pay. So contracts hand part of the claim back to the household, and there are only two ways to do the handing back. The contract can hand back a fixed amount. A fixed amount is a deductible. The contract can instead hand back a fixed share. A fixed share is a co-payment. The two devices answer the same pricing question in opposite directions. Which of them costs a household more depends entirely on how large the claim turns out to be.

Two ways a repair might be priced, before any policy comes into it, make the difference concrete. The workshop at the end of the lane charges a minimum of Rs 500/- to open the machine, whatever the job turns out to be. A tailoring counter takes a tenth of whatever the finished garment comes to. On a tiny job the workshop is brutal and the counter barely registers. On a large job the workshop still charges its Rs 500/- while the counter is taking a tenth of a much larger number. Nothing about either price is unfair, and neither pricing rule is the generous one. The two rules simply put their weight in different places. Which one weighs more on a household cannot be told until the size of the job is known. A deductible is the workshop rule. A co-payment is the counter rule.

Where in a settlement do these two devices actually act?

Before either device does anything, the settlement has already reduced the bill to a smaller number, and both devices act on that smaller number rather than on the hospital bill. The smaller number is the payable amountWhat is left of a bill after items the policy never pays for are removed and after the policy's own internal limits have been applied. The payable amount is the base both a deductible and a co-payment act on.. A household that applies a percentage to the bill total rather than to the payable amount will predict the wrong number every time, and always in the optimistic direction. Getting the base right matters more than it sounds.

The Bhosale household's claim in year three shows the order plainly. The hospital bill was Rs 1,42,000/-. From it came non-payable itemsCharges a policy never pays for at all, such as consumables and an admission kit. Non-payable items are removed before anything else happens, and the household meets them whatever cover it holds. of Rs 8,400/-. Then the room rent limit removed Rs 8,000/- of the room charge, and the proportionate deductionWhere the room taken sits above the policy's room limit, the charges that move with the room category are cut in the same ratio. The cut follows automatically from the room and is nobody's refusal. that follows from taking a room above the limit removed a further Rs 24,000/- of the associated charges. The remainder, Rs 1,01,600/-, is the payable amount. Only at that point does a co-payment or a deductible come into the arithmetic at all. Every figure that follows is a share of Rs 1,01,600/- and never a share of Rs 1,42,000/-.

Hold on to the two numbers in the dark panel. The pair is the commonest arithmetic mistake on this subject, and the two differ by Rs 4,040/- on one ordinary claim. A household that hears the words ten per cent and multiplies the bill by a tenth has quietly assumed that the whole bill was payable. The whole bill never is. The same trap works on a deductible: a Rs 25,000/- threshold applied to the bill and a Rs 25,000/- threshold applied to the payable amount leave the insurer paying different amounts. The threshold is a bite out of a smaller cake than most people picture.

What is a deductible, and what does a threshold actually do?

A deductible is an amount of the payable amount that the household meets first, on its own, before the policy pays anything at all. A deductible is a thresholdA fixed amount that has to be crossed before something else starts. The size of a threshold does not change when the claim changes, and the fixed size is the property that makes a threshold behave the way it does., and a threshold has exactly one number in it. Set a deductible at Rs 25,000/- and the household meets the first Rs 25,000/- of every payable amount, whether the payable amount is Rs 30,000/- or Rs 3,00,000/-. There is no version of a deductible that scales. Scaling is what the other device does.

The Bhosale household's own health cover carries no deductible at all, so the comparison uses an invented and clearly labelled alternative: a policy identical in every respect except that it carries a Rs 25,000/- deductible on each claim and no co-payment. The alternative exists so that the two devices can be compared on the same claim.

A threshold produces two regions rather than one behaviour, and this is the part that surprises people. Below the threshold, the policy pays nothing whatever. A payable amount of Rs 20,000/- against a Rs 25,000/- deductible settles at Rs 20,000/- from the household and Rs 0/- from the insurer, and no letter arrives explaining a deduction because there is no settlement to explain. Above the threshold, the household's rupee cost stops moving completely: Rs 25,000/- on a Rs 50,000/- claim, Rs 25,000/- on a Rs 1,01,600/- claim, Rs 25,000/- on a Rs 5,00,000/- claim. A deductible is the only one of the two devices that has a maximum, and the maximum is the deductible itself.

Watch what that does to the share rather than to the rupees. On a Rs 20,000/- payable amount the household is carrying 100 per cent of the claim. On Rs 50,000/- it carries half. On the household's own Rs 1,01,600/- it would carry 24.6 per cent. On Rs 5,00,000/- it carries 5 per cent. A fixed number is a shrinking fraction of a growing one, so the rupee figure never moved while the share collapsed. A shrinking fraction of a growing number is the whole personality of a deductible.

What is a Co-Payment, and what does a proportion take from every claim?

A co-payment is a share of the payable amount that the household meets, expressed as a percentage and applied to every claim the policy settles. The Bhosale household's own health cover carries one: 10 per cent of the payable amount, contracted, invented for this teaching sequence, and unchanged since the cover was taken. Where a deductible is a threshold, a co-payment is a proportionA share that changes size with whatever it is a share of. Ten per cent of a small number is small and ten per cent of a large number is large. A threshold does not have that property., and a proportion has no number of its own until a claim gives it one.

The difference between a proportion and a threshold has three consequences, and every one is the mirror image of a deductible. First, a co-payment has no floor. Ten per cent of anything leaves ninety per cent behind, and no claim is so small that the policy pays nothing. A Rs 6,000/- payable amount settles with Rs 600/- from the household and Rs 5,400/- from the insurer, and the letter arrives as normal. Second, a co-payment has no ceiling: the household's rupee cost keeps climbing for as long as claims keep growing, so Rs 50,000/- on a Rs 5,00,000/- claim is not an unusual outcome but the ordinary working of the term. Third, and this is the property people find most reassuring and should think about hardest, the share never changes. A co-payment takes exactly the same fraction of a Rs 20,000/- claim and a Rs 5,00,000/- claim. The same fraction is comforting on the small one and expensive on the large one.

Draw the same four claims again, on the same geometry, and the picture is almost boring. The sameness is the point. Where the deductible produced four different shapes, the co-payment produces four identical ones and changes only the label.

One more property belongs here because it catches people out on a second claim in the same year. A co-payment applies to each claim separately, so two settlements in one year each carry their own tenth. A deductible written per claim behaves the same way, and the household meets the threshold twice. A deductible written as an aggregate deductibleA deductible applied across a whole policy year rather than to each claim on its own. Once the year total has crossed it, later claims are settled without meeting it again. does not: it is met once across the year and later claims are settled without it. Which of the two a particular contract carries is a question for that contract itself. The difference between per claim and per year can be larger than the difference between the two devices, and that line repays reading rather than assuming.

Deductible vs Co-Payment: which one takes more from the same claim?

Placing the two devices on the same claim lets them argue. The comparison below runs the Bhosale household's own contracted 10 per cent co-payment against the invented Rs 25,000/- deductible across five payable amounts. Both devices act on the payable amount, both are applied to the same claim, and nothing else about the two policies differs. The last column is where the comparison settles.

The last column changes direction halfway down the table, and the reversal is the single most important fact about the two devices. On the first three rows the deductible is the more expensive device by a wide margin. On the fourth they cost the household precisely the same. On the fifth the co-payment is more expensive, and it goes on getting more expensive for every rupee the claim grows beyond that point. The table gives opposite answers at the top and the bottom. No sentence about which device is kinder can survive it.

Look at the size of the swing as well as its direction. At Rs 20,000/- the deductible takes ten times what the co-payment takes: Rs 20,000/- against Rs 2,000/-. At Rs 5,00,000/- the co-payment takes twice what the deductible takes: Rs 50,000/- against Rs 25,000/-. The two panels below are drawn on identical geometry so the reversal is visible as a shape rather than as a pair of numbers, and each panel is scaled to its own claim because the claims are twenty five times apart in size.

Which device costs more on a small claim, and why?

On a small claim the deductible costs more, and on a claim below the threshold it costs everything. The reason is not that the deductible is a harsher term. The reason is that a threshold does not know the claim is small. A Rs 25,000/- deductible asks for Rs 25,000/- with the same indifference whether the payable amount is Rs 3,00,000/- or Rs 26,000/-, and where the payable amount is below Rs 25,000/- it asks for the whole of it and the policy contributes nothing at all.

The Rs 20,000/- row, followed to the end, shows what that means in rupees. Under the co-payment the household pays Rs 2,000/- and the insurer pays Rs 18,000/-. Under the deductible the household pays Rs 20,000/- and the insurer pays Rs 0/-. The gap is Rs 18,000/-, ninety per cent of the entire claim, on a difference between two clauses that both look modest in a policy document. A deductible does not reduce a small claim, it removes it, and a household with a deductible large enough will never see a settlement for the ordinary claims that make up most of the ones it will ever have.

Which device costs more on a large claim, and why?

On a large claim the answer flips, and it flips for a reason as simple as the first one. A proportion keeps growing because it is a proportion. A threshold stops growing because it is a threshold. Once the claim is large enough that ten per cent of it has passed Rs 25,000/-, every further rupee of claim adds ten paise to what the household pays under the co-payment and adds nothing whatever under the deductible.

Take the Rs 5,00,000/- row. Under the co-payment the household pays Rs 50,000/- and the insurer pays Rs 4,50,000/-. Under the deductible the household pays Rs 25,000/- and the insurer pays Rs 4,75,000/-. The co-payment is now the costlier device by Rs 25,000/-, exactly reversing the earlier picture. And the reversal is not a one time event: at a payable amount of Rs 10,00,000/- the co-payment would take Rs 1,00,000/- and the deductible would still take Rs 25,000/-. The deductible has a worst case and the co-payment does not. A worst case matters most on precisely the claims a household most needs the cover for.

Notice what that does to the reason people hold the cover in the first place. Nobody buys a health policy because of the Rs 20,000/- claims. Households hold a policy against the claim that would otherwise take a decade of saving. On that claim the proportion is the device doing the damage, and the threshold has quietly become the smaller of the two costs.

Where exactly is the crossover, and how is it found?

The crossoverThe claim size at which two pricing devices cost exactly the same. Below the crossover one device is dearer and above it the other is. Locating that point beats guessing at it. is not a matter of judgement. The crossover is one division. The two devices cost the same when the proportion has grown to equal the threshold, so the crossover sits at the deductible divided by the co-payment rate. Here that is Rs 25,000/- divided by 0.10, a payable amount of Rs 2,50,000/-. At that claim the household pays Rs 25,000/- either way and the insurer pays Rs 2,25,000/- either way, and the choice of device is worth nothing at all.

Every claim smaller than Rs 2,50,000/- is cheaper for this household under the co-payment, and every claim larger than Rs 2,50,000/- is cheaper under the deductible, with no exceptions and no shading in between. That is what a straight line crossing a flat line means, and it is why the picture below carries the argument better than any paragraph can. The rising line is the co-payment, running up from the origin at ten paise in the rupee. The flat line is the deductible, rising steeply to Rs 25,000/- and then stopping dead. The two lines meet once, at Rs 2,50,000/-, and never again.

A third line is drawn across the same picture and it belongs to the household rather than to either policy. The Bhosale household can reach Rs 41,887/- on the same day, a figure settled when its holdings were sorted by speed at 31 March of year two. Drawn as a horizontal reference, that line answers a question neither device answers: not which is cheaper, but which one asks for more than the household can actually produce. The deductible never crosses it. Rs 25,000/- is where the deductible stops. The co-payment crosses it at a payable amount of Rs 4,18,870/-, above which the household is being asked for more same-day money than it holds.

Two movements are worth making before reading on. Dragged slowly from the far left, the control shrinks the red bar in the lower panel as a share while its rupee figure sits still. One movement shows the whole behaviour of a threshold. Parked at Rs 2,50,000/-, the control makes the two bars identical: at that one claim size the contract wording makes no difference to anybody, and a household comparing the two devices at that point is comparing nothing.

In what order are the two applied when a policy carries both?

Some contracts carry both devices, and then the order matters. The two orders produce different numbers on the identical claim. The order that follows from the way the devices are defined is the deductible first, on the payable amount, and then the co-payment on what is left. Deductible first is the sequence worked here. The contract wording sets the order, and the wording is where the order is read rather than assumed.

Work it on the household's Rs 1,01,600/- payable amount with both devices present. Deductible first: the household meets Rs 25,000/-, leaving Rs 76,600/-, and the co-payment takes ten per cent of that, Rs 7,660/-. The household pays Rs 32,660/- and the insurer pays Rs 68,940/-. Now reverse it. Co-payment first: ten per cent of Rs 1,01,600/- is Rs 10,160/-, and the deductible then takes Rs 25,000/- off what remains, so the household pays Rs 35,160/- and the insurer pays Rs 66,440/-.

The two orders differ by Rs 2,500/- on the same claim, and that gap is exactly the co-payment rate applied to the deductible, ten per cent of Rs 25,000/-. The gap grows with both the size of the deductible and the size of the co-payment. It does not grow with the claim. The ordering affects only the deductible, so on a Rs 5,00,000/- payable amount with both devices the two orders still differ by Rs 2,500/-. Rs 2,500/- is a small number here and a fixed one, worth reading once in a contract and never worrying about again.

What was the choice of device worth on this household's own claim?

The Bhosale household made one claim, so all of the arithmetic above lands on a single number. Ira Bhosale was admitted for four days in year three, the bill came to Rs 1,42,000/-, and after the non-payable items, the room rent limit and the proportionate deduction the payable amount was Rs 1,01,600/-. The policy in force carries a 10 per cent co-payment, so the household paid Rs 10,160/- of that and the insurer paid Rs 91,440/-.

Run the same claim under the invented alternative and the arithmetic is short. A Rs 25,000/- deductible on a Rs 1,01,600/- payable amount takes Rs 25,000/- from the household and leaves Rs 76,600/- for the insurer. On this household's own claim the co-payment was the cheaper structure by Rs 14,840/-, about a third of everything that leaves this household in an ordinary month. Nobody engineered that outcome. The claim happened to land at a size where the proportion was the gentler device, and had the same admission run to a payable amount of Rs 3,00,000/- the comparison would have pointed the other way by Rs 5,000/-.

A single claim is a terrible way to judge a clause, so keep both halves in view. The Rs 14,840/- is real and it stayed in the household. The Rs 14,840/- is also the outcome of one draw from a distribution of claim sizes nobody controls, and the same clause that saved it here would have cost Rs 25,000/- on a Rs 5,00,000/- claim. A device is not proved right by the claim that happened to arrive.

Why do policies carry either device at all?

Because both take something off the price of the cover, and they do it by handing part of the claim back to the household. Handing part of the claim back is the entire answer, and the answer is a statement about how a contract is priced rather than a defence of either device. An insurer that met every rupee of every claim would have to charge for every rupee of every claim, including a very large number of small ones. A contract that hands some of that back charges less for what remains. Which claims it hands back is the difference between the two devices.

A premium, and the amount either device takes off a premium, are contract terms rather than facts about the world, and no general figure exists for either. The shape of what each device hands back can be said precisely, and the shape is completely different even where the price effect might be similar. A deductible hands back the whole of every small claim and a flat slice of every large one. A co-payment hands back a tenth of everything: very little on the claims that happen often, a great deal on the claim that arrives once.

Two devices that reduce a price by handing back claims hand back completely different claims. A matching price does not make them interchangeable. The difference in what they hand back is the reason neither device can be named the better one, and it is also the reason a household cannot read the comparison off the price alone.

What does each device do to a household's real position rather than to its premium?

Every figure so far has compared the two devices against each other. Compare them instead against what the household can actually produce on the day the hospital desk asks, and a different picture appears. The hospital desk does not want a percentage. The desk wants money, that afternoon, from an account. The Bhosale household can reach Rs 41,887/- the same day. Measure both devices against that single number and the question stops being which is cheaper and becomes which one this household could meet at all.

Under the 10 per cent co-payment the demand starts small and grows with the claim: Rs 2,000/- on a Rs 20,000/- claim, or 4.8 per cent of the same-day money, up to Rs 50,000/- on a Rs 5,00,000/- claim, or 119.4 per cent of it and therefore not payable from that money at all. Under the Rs 25,000/- deductible the demand is Rs 25,000/- almost immediately and then never moves: 59.7 per cent of the same-day money on a Rs 50,000/- claim, on a Rs 1,01,600/- claim and on a Rs 5,00,000/- claim alike. The deductible asks for more than half of everything this household can reach in a day, on every claim it will ever make, and it asks for it before the policy contributes a single rupee.

The honest question is therefore not which device is better. The question is which size of claim this particular household could not produce from what it can actually reach, and the answer is about the buffer rather than about the policy. A household holding two years of outgoings in a savings account is genuinely indifferent to a Rs 25,000/- threshold and would feel a Rs 50,000/- proportion on a large claim. A household holding three weeks of outgoings feels the threshold on every ordinary claim and would have to borrow for either device on the large one. Two households handed identical quotations are looking at different problems, and nothing on either quotation can tell them apart.

What is worth writing down before the next claim arrives?

Three things, and not one of them is a device to prefer.

The first is the sentence that the device is applied to the payable amount. A household that remembers only this will predict its own share more accurately than one that remembers the percentage but applies it to the bill. Ten per cent of the Bhosale household's bill was Rs 14,200/-. Ten per cent of its payable amount was Rs 10,160/-. Both are correct arithmetic. Only the second is what the policy does.

The second is the crossover, written as a division rather than as a number to memorise. The deductible divided by the co-payment rate gives the claim size where the two devices cost the same, and for the terms worked here that is Rs 25,000/- over 0.10, or Rs 2,50,000/-. Change either term and the crossover moves. A division is therefore worth holding instead of a figure.

The third is the comparison that keeps returning: what either device would demand, set beside what the household can actually reach on the day. The comparison with the buffer, and not the price, decides whether a settled claim leaves a household bruised or leaves it borrowing. The device is written by the insurer, the buffer belongs to the household, and it is the meeting of the two rather than either one alone that produces the number nobody forgets.

The Bhosale household, Meghna Bhosale, Ashok Bhosale, Ira Bhosale and Sahyadri Freight Services Private Limited are invented.
Educational material. Not advice on any investment, tax, budget or market position.