A mortgage broker in Leeds tells a version of the same story most weeks: a couple in their early thirties comes in to remortgage, gets asked in passing whether their life insurance still matches the loan, and has no idea. The policy, if there is one, was taken out when they bought their first flat five years earlier, covers a debt that has since grown by a third, and has never been looked at again since the paperwork was signed. Nobody sold them anything wrong at the time — the cover simply stopped being the right size for the life they are now living, with a bigger mortgage, a second income that didn't exist before, and in some cases a child who wasn't born yet.
That gap between what a policy was set up to do and what it is actually doing years later is where most UK households get life insurance wrong. It is rarely about having no cover at all. It is about a sum insured that was reasonable once, chosen under time pressure during a house purchase or a mortgage application, and never revisited against the mortgage balance, the number of dependants, or the income it was meant to replace. Life insurance is one of the few financial products people buy once and then genuinely forget about, because unlike a pension or a savings account there is no statement landing on the doormat each year to prompt a second look. The mortgage grows, a child arrives, a salary changes, and the policy sits untouched in a drawer through all of it, still doing the arithmetic of a household that no longer exists in quite that shape. Getting the sum right is not a one-off decision made at completion — it is a figure that needs revisiting roughly as often as the mortgage itself gets restructured.
Start with the debt that would otherwise outlive you
The mortgage is the easiest number to get right, because it is the one figure your lender can tell you precisely. If you have a repayment mortgage, the balance falls every year as you pay it off, which makes decreasing term insurance the better match — the sum insured shrinks roughly in step with the loan, and the premium stays level for the term. Buying level term cover instead, where the payout stays fixed at the original amount for twenty or twenty-five years, means paying for protection you will not need in year eighteen just as much as you need it in year one.
Interest-only mortgages flip that logic. Because the capital doesn't reduce until the loan matures, decreasing cover leaves a shortfall — level term insurance, sized to the full outstanding balance, is the correct fit there. Anyone who remortgages onto an interest-only or part-and-part deal while keeping an old decreasing-term policy is very likely underinsured against the debt it was bought to cover.
Joint life vs two single policies
Couples buying a joint mortgage are usually offered joint life, first-death cover as the default, and it is cheaper than two single-life policies for the same sum insured. The catch is what happens after the first claim: a joint policy pays out once, on the first death, and then it's gone — the surviving partner has no cover at all going forward unless they arrange new insurance from scratch, at whatever age and health status they happen to be at that point. Two single-life policies cost more upfront but leave the survivor covered, and for most couples with young children, that difference is worth paying for.
Income replacement is the sum that gets skipped
Mortgage cover only answers one question: what happens to the house. It says nothing about school shoes, food shopping, energy bills, or childcare, which is where income replacement comes in — and where most people either guess or ignore the question entirely. The rough method advisers use is to estimate how many years the household would need extra support (commonly until the youngest child finishes education, or until the surviving partner could realistically increase their own earning capacity) and multiply the income being replaced by that number of years, then adjust down for savings, pensions, and any benefits the household could draw on. So what happens if you already have life insurance through work?
Employer death-in-service benefit, typically a multiple of salary paid out if you die while employed, is valuable and worth checking rather than assuming. But it is not portable — leave the job, lose the cover — and it usually falls well short of full income replacement on its own, so treat it as a top-up to a personal policy, not a substitute for one. Self-employed readers don't have this safety net at all, which means the personal sum needs to do the entire job alone.
Dependants change the maths more than a flat multiple of salary
A household with no children and two full incomes has a genuinely different insurance need from a household with three children and one earner, even if the mortgage balance is identical. Younger children mean more years of financial dependency ahead, which points toward a longer term and a larger sum, while teenagers close to independence need a shorter one. A single-income household carries a different kind of risk again: there is no second salary to fall back on while a claim is being processed or a return to work is planned, so the gap between the death and the payout matters more than it does when a partner's earnings can cover the essentials in the meantime. A child with additional needs that will require support into adulthood changes the calculation again, sometimes pointing toward whole-of-life cover rather than a policy that simply expires at a fixed date. A flat multiple of salary, the shortcut most online calculators default to, misses every one of these distinctions by design. What it also misses is harder to reduce to a formula at all:
- Childcare costs if the surviving parent needs to return to work sooner than planned, or work longer hours than before
- Private school fees already committed to, which don't pause for a bereavement
- An elderly parent who depends on the policyholder for care coordination or financial support, and would need paid help arranged in their place
- Existing debts outside the mortgage — car finance, a loan taken for home improvements, credit card balances that a single income could no longer service comfortably
None of these show up if you size cover purely against the mortgage, which is exactly why mortgage-only cover is the single most common form of underinsurance among UK families with children.
Term life insurance is the default for a reason
For most working-age households, term life insurance — cover that pays out only if you die within a fixed period, with no value if you outlive it — is the right starting point, because it matches a need that also has an end date: the mortgage gets paid off, the children grow up, earning years wind down toward a pension. Level term suits income replacement and interest-only mortgages; decreasing term suits repayment mortgages; increasing term, which rises each year in line with an index, suits anyone worried inflation will erode a fixed sum over a twenty-five-year policy.
Whole-of-life cover earns its higher price in a narrower set of cases
Whole-of-life insurance costs noticeably more than term cover for the same sum insured, and the reason is structural rather than a pricing quirk: term cover only pays out if you die within the term, so many policyholders never claim, while whole-of-life cover is guaranteed to pay out eventually — the insurer is pricing a certainty, not a probability. That makes it a poor substitute for mortgage or income cover, where the need genuinely has an end date — but it earns its place for funeral costs (a fixed, guaranteed sum regardless of when death occurs), for inheritance tax planning written in trust, or for a dependant who will need financial support for the whole of their own life, not just until a policy's arbitrary end date.
Family income benefit: the policy most people have never heard of
Family income benefit pays a regular income for the remainder of the policy term instead of a single lump sum, and it is consistently cheaper than an equivalent term policy for households whose main need is monthly income replacement rather than a one-off payment. The lower price reflects a genuine trade-off: a death in year two of a twenty-year policy pays out eighteen years of income, while a death in year eighteen pays out only two, so the insurer's average payout is smaller than on a lump sum sized for the worst-case early death. It suits families whose core worry is the monthly budget rather than clearing a specific debt in one go — worth asking for by name, since plenty of advisers default to quoting level or decreasing term without mentioning it at all.
What insurers ask at application, and why guessing backfires
Every application asks about medical history, smoking status, family history of certain conditions, occupation, and hobbies that carry higher risk, and the honest answer is the only one worth giving. Under- or non-disclosure — rounding down a cigarette habit, forgetting a diagnosis that felt minor at the time — does not save money on the premium; it gives the insurer grounds to void the policy if it comes to light during a claim, precisely the moment a family can least afford a dispute. The Association of British Insurers' code on non-disclosure draws a line between innocent mistakes and deliberate or reckless misrepresentation, and insurers are expected to treat genuine errors more leniently — but that protection only applies if the original answers were given carefully and in good faith.
Where underwriting genuinely gets complicated is pre-existing conditions. A past diagnosis doesn't automatically mean no cover is available; more often it means a loaded premium, an exclusion for that condition, or a referral to a specialist insurer — routes worth pursuing through a broker rather than assuming standard cover is out of reach.
A policy set at thirty doesn't fit at forty
Cover chosen during a first house purchase is a snapshot of that moment's mortgage, income, and family size — not a permanent fit. A pay rise, a second child, an extended mortgage term after a remortgage, or elderly parents who now depend on you financially all change the number that should be on the policy schedule, and none of them trigger an automatic review from the insurer. That review has to be started by the policyholder, ideally at every remortgage and at every major life change, rather than left for a broker to raise in passing five years after it should have happened.