How Health Insurance Deductibles Change Cost and Cover

The lever Arjun keeps being offered

Every quote Arjun has looked at becomes noticeably cheaper if he accepts a deductible, and the saving is large enough to be tempting on all of them.

What none of the quotes tells him is how often he would actually pay it, or what happens in the years when he pays it more than once. Those are the two questions that decide whether the trade is a good one for his family, and they cannot be answered from the premium column.

What a deductible is

A deductible is an amount you carry yourself before the policy pays anything. Above it, the policy engages; below it, the claim is entirely yours.

It reduces the premium for a straightforward reason. Most claims are small, so an insurer that never has to process or pay small claims has a much cheaper book — and it passes some of that back. You are not buying a discount. You are selling the insurer the small claims and keeping the large ones, which is very close to what insurance is for in the first place.

That framing is useful because it explains when a deductible is sensible and when it is not. If the purpose of Arjun's cover is to protect the family from a bill that would damage them, then small claims were never the point, and paying a lower premium to stop covering them is a rational trade. If the purpose is to avoid all medical outgo, a deductible defeats it.

Per claim or per year

This is the distinction that decides whether the arrangement works for a family, and it is the same one that separates a top-up from a super top-up.

A per-claim deductible applies to every hospitalisation separately. Three admissions in a year, each below the deductible, and Arjun pays all three in full.

A per-year deductible — sometimes called an aggregate deductible — applies to the total of the year's claims. Those same three admissions accumulate, and once the total crosses the deductible the policy pays the rest.

For a family, the second is substantially better and the difference grows with the number of people covered and their age. Several moderate claims in a year is an ordinary pattern, not an unlucky one, and a per-claim deductible is designed around a household that has one event at a time.

Working out whether the trade is worth it

The arithmetic is simple and almost nobody does it.

Take the annual premium saving from accepting the deductible. Then ask how many years out of ten the household would plausibly have a claim reaching it. If the saving over those ten years comfortably exceeds the deductible paid in the years he claims, the trade is favourable. If it is close, it is not — because the deductible arrives as a lump at an inconvenient moment while the saving arrives in comfortable instalments.

Then ask a second question that the arithmetic does not capture: could the family pay the deductible, in cash, tomorrow, without borrowing or selling something? A deductible is only a saving if it is affordable at the moment it falls due. Where it is not, the premium saving has bought a hole rather than a discount, and the hole opens during a hospitalisation.

This is why a deductible and an emergency fund are the same decision viewed from two sides. Arjun can carry a larger deductible if he has reachable cash, and should carry a smaller one if he does not.

Where deductibles are genuinely useful

They make large cover affordable, which is their best use. A policy with a substantial sum insured and a deductible can cost less than a modest policy with none, and it protects against the event that would actually hurt.

They work well on top of employer cover, where the employer's policy effectively pays the deductible while Arjun is employed and his own policy handles the large event. That is the same logic as a super top-up, and it is a good arrangement provided he remembers that the employer layer disappears with the job.

And they suit somebody with an emergency fund who has deliberately decided to self-insure the small stuff, which is a coherent position rather than a compromise.

Where they are a poor idea

Where the deductible could not be paid from savings, for the reasons above. Where the household's claim pattern is likely to be frequent and moderate rather than rare and large, since the policy will rarely engage. Where the deductible is per claim rather than per year and the family is more than two people. And where it was accepted without being noticed at all, which is how most deductibles enter a policy.

What to take away

A deductible sells the insurer your small claims and keeps the large ones, which is a reasonable trade if large claims were the reason you bought cover.

Insist on an aggregate deductible measured across the year rather than one applying to each claim. Do the arithmetic on the premium saving against the deductible you would actually pay. And before accepting any of it, check that you could pay the amount in cash on the day — because a deductible you cannot fund is not a cheaper policy, it is an uninsured gap you have agreed to in advance.