Decreasing Term Life Insurance for Your Mortgage

Decreasing term life insurance is a fixed-term policy where the payout, known as the sum assured, falls gradually over the life of the plan while your monthly premium stays the same throughout. It's built specifically to track a repayment mortgage, where the amount you owe shrinks a little with every monthly payment, so the cover reduces roughly in step with your outstanding balance rather than staying level.

This matters because most homeowners don't need the same amount of life insurance for their mortgage in year 20 as they did in year one. If you took out a 25-year repayment mortgage of 250,000 pounds, your balance in year one is close to the full amount, but by year 20 it might have fallen to under 70,000 pounds. Decreasing term cover is priced to reflect that shrinking risk, which is exactly why it tends to cost noticeably less than a level term policy offering the same starting amount of cover.

• Falling payout: The sum assured reduces on a set schedule, usually monthly or annually, agreed at the outset.
• Fixed premiums: What you pay each month is locked in for the whole term, even as the payout falls.
• Fixed term: Cover runs for a set number of years, typically matched to your mortgage term, with no payout if you outlive the policy.
• No cash value: Like other term life insurance, there's nothing to cash in or claim if you don't die within the term.

Decreasing term life insurance works by reducing your sum assured on a pre-agreed schedule that broadly mirrors a standard repayment mortgage amortisation curve, so the cover available at any point roughly matches what you'd still owe the lender if you died that year. You choose the starting sum assured, the term length, and the insurer calculates a decreasing schedule based on a typical interest rate assumption, usually somewhere between 3% and 8%.

Because most repayment mortgages clear more of the interest than the capital in the early years, the sum assured often falls slowly at first and then more steeply later in the term. This is a broad approximation rather than an exact mirror of your actual mortgage statement, particularly if your mortgage rate changes or you switch deals, so it's worth checking the schedule an insurer proposes against your own repayment plan before you commit. If you die during the term, your family receives a single tax-free lump sum equal to whatever the sum assured has fallen to at that point, paid to help clear the remaining mortgage.

Here's a worked example for a 250,000 pound, 25-year repayment mortgage, showing how the illustrative decreasing term cover compares to the outstanding balance at different points in the term:

The difference between decreasing and level term life insurance comes down to what happens to the payout over time. Decreasing term cover falls each year to track a shrinking debt, while level term cover stays exactly the same from the day you take it out to the day the policy ends. That single difference changes both the price and the best use case for each.

Because the insurer's average risk exposure is lower with a decreasing schedule, monthly premiums for decreasing term cover are typically 20% to 40% cheaper than level term cover for the same starting sum assured and term length. Level term costs more because the insurer is on the hook for the full amount regardless of when in the term you die, which is exactly why it suits needs that don't shrink over time, such as replacing income, covering a family's living costs, or protecting an interest-only mortgage where the capital balance never reduces.

A common mistake is choosing decreasing term purely on price without checking it against your actual mortgage type and any plans to borrow more later, since the cover won't stretch to cover additional debt taken on part-way through the term.

Whether decreasing term life insurance fits your circumstances depends almost entirely on the type of mortgage you have. With a repayment mortgage, every monthly payment reduces the capital you owe, so a falling sum assured that tracks that reduction makes financial sense and keeps premiums as low as possible. With an interest-only mortgage, none of your monthly payment reduces the capital, meaning you'll owe the full original amount right up until the last day of the term, which is where decreasing term cover stops being a good fit.

According to guidance from MoneyHelper, the government-backed money advice service, borrowers should always match their life insurance structure to how their mortgage capital actually behaves rather than assuming any protection policy will automatically cover the debt. Getting this wrong is one of the most common and costly mistakes homeowners make when arranging mortgage protection, and it's worth checking your mortgage offer letter to confirm which type you have before you apply, since some mortgages combine part repayment and part interest-only in a single deal.

• Choose decreasing term if: you have a repayment mortgage, want the lowest possible premium, and don't expect to significantly increase your borrowing during the term.
• Choose level term instead if: you have an interest-only mortgage, part-repayment part-interest-only mortgage, or you want cover that also protects other fixed costs like income replacement alongside the mortgage.

Working out how much decreasing term cover you need starts with your mortgage offer or latest annual statement, which shows the exact outstanding balance and remaining term the policy should be matched against. Getting this figure right at the outset matters because most insurers won't let you increase the sum assured later without applying for a new policy and going through underwriting again from scratch.

• Match the starting sum assured to your outstanding mortgage balance, not the original loan amount if you've already been paying it down for some years.
• Add a buffer for funeral costs and other debts if you want the payout to stretch beyond clearing the mortgage. UK funerals now average around 4,000 to 5,000 pounds, so many people round their cover up slightly to account for this.
• Work out your own guide using our how much life insurance cover you need calculator if you also want to protect against other outstanding debts or provide ongoing income for dependants.
• Consider joint cover for co-borrowers. If you have a mortgage with a partner, joint life insurance pays out once on the first death, which is usually cheaper than two single policies, though it only pays out one time even if you later separate or remortgage individually.

Decreasing term life insurance typically costs from around 6 pounds a month for a healthy non-smoker in their late twenties or early thirties, rising with age, health, and the size and length of the mortgage being protected. Because the insurer's exposure falls over the term, premiums for decreasing term cover consistently come in lower than the equivalent level term policy, often by a quarter to a third for the same starting sum assured. See our full breakdown of what affects life insurance costs for the wider factors insurers weigh up.

The figures below are indicative monthly premiums for 200,000 pounds of decreasing term cover over a 25-year term for a non-smoker in good health, based on typical UK market pricing. Actual quotes vary by insurer, so it's worth comparing more than one before you buy rather than accepting the first quote you're shown, since two insurers can price the same age and cover amount very differently depending on how they weigh up occupation, family medical history and body mass index. Smokers should expect to pay roughly 50% to 100% more than the figures shown below for the same cover, and anyone with a pre-existing health condition may be offered a loaded premium or an exclusion rather than a flat decline.

Insurers price decreasing term life insurance by weighing up how likely you are to claim during the term and how much that claim would cost them on average, given that the payout falls year on year. Several factors combine to set your individual premium, and small changes to any of them can move your quote noticeably.

• Age: Starting a policy in your late twenties or thirties locks in significantly cheaper rates than waiting until your forties or fifties, since risk rises with age.
• Smoker status: Smokers typically pay 50% to 100% more than non-smokers for the same cover, and you must disclose smoking or vaping within the last 12 months.
• Health and pre-existing conditions: Conditions like diabetes, high blood pressure or a family history of certain illnesses can increase premiums or lead to exclusions.
• Cover amount: A higher starting sum assured, matched to a larger mortgage, increases the premium proportionally.
• Term length: A longer mortgage term means more years of cover, which raises the overall cost even though the sum assured falls throughout.
• Occupation: Higher-risk jobs, such as those involving regular work at height or offshore roles, can attract loaded premiums from some insurers.

Many lenders and advisers suggest adding critical illness cover to a decreasing term policy, so that the same falling sum assured also pays out if you're diagnosed with a specified serious illness, such as certain cancers, a heart attack or a stroke, rather than only on death. This can roughly double your premium, but it protects against the more statistically likely event of surviving a serious illness but being unable to work and keep up mortgage payments. Read our full comparison of life insurance vs critical illness cover to weigh up whether the extra cost suits your situation, particularly if you're self-employed or have limited sick pay from an employer.

Writing your decreasing term policy in trust is another step worth taking even though the eventual payout shrinks over time. Putting the policy in trust means the payout goes directly to your chosen beneficiaries rather than forming part of your estate, which typically means it reaches your family within weeks rather than the months it can take for probate to be granted. It also usually keeps the payout outside your estate for inheritance tax purposes, and there's no cost to set up a trust with most insurers when you take out the policy.

Decreasing term life insurance is a good fit for a lot of repayment mortgage holders, but it isn't the right choice in every situation. Weighing up the specific advantages and drawbacks against your own mortgage type, borrowing plans and family circumstances will help you decide whether it's worth the lower price compared with level term cover.

The biggest advantage is cost. For a household already stretching to cover mortgage repayments, council tax and everyday bills, saving 20% to 40% on the premium compared with level term cover can make the difference between arranging protection now and putting it off. The trade-off is flexibility: once the schedule is set, the falling cover won't automatically adjust if your circumstances change, whether that's borrowing more, extending your mortgage term, or switching to an interest-only arrangement. Reviewing your policy whenever you remortgage is the simplest way to catch a mismatch before it becomes a problem for your family.

Getting decreasing term life insurance in place doesn't need to happen at the exact moment you complete on your mortgage, but doing it promptly means your family isn't left exposed if something happens to you before cover is arranged. A few practical steps make the process straightforward.

• Confirm your mortgage type and outstanding balance from your latest statement or completion documents, since this sets your starting sum assured and term.
• Decide on trust and critical illness add-ons before you apply, as adding these later usually means starting a new application.
• Compare quotes across insurers rather than accepting the first offer, since premiums for identical cover can vary by 20% or more between providers.
• Disclose your health accurately on the application. According to the Association of British Insurers, UK protection insurers paid out over 98% of individual life insurance claims in 2023, and the vast majority of declined claims involve non-disclosure of relevant health information at application, not the illness itself.

If the worst happens, our guide to making a life insurance claim walks through the documents your family will need and how long a typical decreasing term payout takes to clear.