Decreasing Term Life Insurance: Mortgage Life Cover Explained

Decreasing term life insurance is life cover where the payout falls over the policy term, roughly in line with a repayment mortgage. It is often called mortgage life insurance. If you die during the term, it pays a lump sum designed to clear what is left on the mortgage, so your family can stay in the home.

For most people with a repayment mortgage, clearing the loan is the first thing they want life cover to do. Decreasing term is built for exactly that job, and because the insurer’s risk falls each year, it is usually the cheapest way to do it.

It is not perfect, though. The cover follows an assumed repayment pattern, not your actual mortgage, and the two can drift apart. This guide explains how it works, where the gaps appear and how to avoid them. For the wider picture, see our ultimate UK protection guide.

How does decreasing term life insurance work?

You choose a starting amount, usually your mortgage balance, and a term, usually the remaining mortgage term. The amount of cover then reduces over the term until it reaches zero at the end. If you die during the policy, the insurer pays the amount of cover in force at that point.

MoneyHelper describes it as cover where “the level of cover reduces each year. It’s designed to be used with repayment mortgages” (MoneyHelper).

The reason it falls is simple. With a repayment mortgage, each monthly payment covers the interest and repays some of the loan. The balance falls slowly at first, when most of each payment is interest, then faster in later years. A decreasing term policy is designed to follow that same curve.

Feature	Decreasing term life insurance
Payout amount	Falls over the term, following a repayment pattern
Designed for	Repayment mortgages
How it pays	One lump sum, normally tax free
At the end of the term	Cover reaches zero and ends
Cash-in value	None
Premiums	Usually fixed for the term, even though the cover falls

The premium usually stays the same each month, even though the cover reduces. That surprises some people, but it is how the policy is priced: the insurer averages the cost over the whole term. Many policies also include terminal illness cover, which can pay out early on a diagnosis that is expected to lead to death within 12 months. Check the wording for when this applies.

Is decreasing term the same as mortgage life insurance?

In everyday use, yes. “Mortgage life insurance” is a common name for decreasing term cover set up to match a repayment mortgage. It is not a separate product, and you do not have to buy it from your lender. You can arrange it through an adviser and it does not need to be with the same company as your mortgage.

Life cover is not normally a legal condition of a mortgage. Lenders usually require buildings insurance, but they leave life cover to you. That said, if you share a mortgage with a partner, or anyone relies on you to keep a roof over their head, it is usually one of the first things to put in place. See our first-time buyer mortgage advice for how we arrange the two together.

Who is decreasing term life insurance for?

It suits:

• homeowners with a repayment mortgage who want the loan cleared if they die
• couples who could not afford the mortgage on one income
• people who want the most affordable way to protect their home
• anyone with another debt that reduces on a fixed schedule, such as a long-term loan.

It does not suit:

• interest-only mortgages, where the balance does not fall. Use level term life insurance instead
• the interest-only part of a part and part mortgage, which needs level cover for that part
• replacing your income for your family. Decreasing cover only clears the debt. Look at family income benefit or level term for living costs
• people who want cover for life. For that, see whole of life insurance.

What is the interest rate assumption in decreasing term cover?

This is the part most people never hear about. To work out how fast the cover falls, each insurer builds in an assumed interest rate. The cover then reduces as if your mortgage were charged at that rate for the whole term. The assumed rate varies between insurers and policies, so ask what it is before you buy.

Your actual mortgage will not follow that assumption exactly. You might fix at one rate, move to a tracker, then fix again at a different rate. Over 25 years your rate could be higher or lower than the policy assumed.

• If your mortgage rate is lower than the assumed rate, your balance usually falls faster than your cover. The cover stays above the debt, which is fine.
• If your mortgage rate is higher than the assumed rate, your balance falls more slowly than your cover. That can leave a shortfall, where the payout is less than the mortgage.

There are ways to reduce this risk. You can choose a policy with a higher assumed rate, start the cover a little above your mortgage balance, or use level term for part of the amount. We check this when we compare policies for you.

What else can make your cover fall out of step with your mortgage?

The rate assumption is not the only cause. These changes are common and each one can leave a gap:

Change	What happens to your cover
You remortgage and extend the term	The policy still ends on the original date, so the later years are uncovered
You borrow more for home improvements or debt consolidation	The extra borrowing is not covered
You move home with a bigger mortgage	The policy only covers the original amount and term
You switch part of the loan to interest only	That part stops falling, but the cover keeps reducing
You overpay the mortgage	Usually helpful, as the debt falls faster than the cover

A decreasing policy is a snapshot of your mortgage on the day you take it. Every time the mortgage changes, the policy should be checked. When you are moving home, this is often the moment to review the whole set-up.

Should you choose joint or single decreasing term cover?

Couples with a joint mortgage often take a joint life first death policy. It covers both of you, pays out once on the first death and then ends. It is usually a little cheaper than two single policies.

Two single policies each pay out separately. If one partner dies, the mortgage is cleared by their policy and the surviving partner keeps their own cover for whatever comes next.

	Joint policy	Two single policies
Payouts	One, on the first death	Up to two, one for each person
Cost	Usually lower	Usually a little higher
After the first claim	Cover ends, the survivor has none	The survivor’s cover continues
Both die together	Usually pays once	Each policy can pay out
If you separate	Has to be cancelled or kept as is	Each person keeps their own
Different amounts for each person	Not possible	Possible

There is no single right answer. A joint policy is a sensible, affordable way to clear a shared mortgage. Single policies cost a little more but give more flexibility and leave the survivor protected. If one partner’s income is far larger, or you are not married, single policies are often worth the small extra cost. We price both so you can decide.

What affects the cost of decreasing term life insurance?

We do not publish prices, because they depend on you. Insurers look at:

• your age when the policy starts
• your health, height and weight, and family medical history
• smoking and vaping, which usually mean higher premiums
• your job and hobbies
• the starting amount and the term
• joint or single cover
• extras such as critical illness cover or waiver of premium.

For the same starting amount, decreasing term is usually cheaper than level term, because the insurer’s potential payout falls each year. That is the main reason it is so widely used for mortgages.

Should you add critical illness cover?

You can take decreasing term with critical illness cover, so it pays the reducing amount on a serious diagnosis as well as on death. This can clear or reduce the mortgage while you are alive and recovering. It costs more than life cover alone, and the definitions of each illness vary between insurers. Pair it with income protection if you want to protect your monthly payments while you are off work.

Does decreasing term need to be written in trust?

It is often worth doing, even for mortgage cover. A trust lets the insurer pay the trustees directly, usually without waiting for probate, so the mortgage can be dealt with sooner. It also normally keeps the payout outside your estate for inheritance tax. MoneyHelper notes that with a trust, “the value of your policy is not considered as part of your estate” (MoneyHelper).

The inheritance tax nil-rate band is £325,000 and the residence nil-rate band is £175,000, both frozen until 5 April 2030 (GOV.UK).

There is one practical point with joint policies. A joint policy written in trust pays the trustees, and the trust wording needs to suit how you want the mortgage cleared for the surviving partner. We walk through the options with you when the policy is set up.

What are the most common decreasing term mistakes?

1. Using it for an interest-only mortgage. The cover falls but the debt does not.
2. Never checking the assumed interest rate. A rate below your actual mortgage rate can leave a shortfall.
3. Forgetting to update it after a remortgage. A longer term or extra borrowing is not covered.
4. Relying on it to support the family. It clears the mortgage and little else. Living costs need separate cover.
5. Choosing joint cover without thinking about the survivor. After one claim, the surviving partner has nothing.
6. Cancelling a good policy too quickly. Replacing cover later means paying for your older age and current health.

How Option Finance helps with mortgage life insurance

We arrange your mortgage and your protection together, so the cover is built around the actual loan. We will:

• match the starting amount and term to your mortgage
• compare decreasing term policies from a range of UK insurers, including the rate each one assumes
• price joint and single cover so you can see the difference
• show whether part of the cover should be level, for example for an interest-only part
• help you set up a trust where it suits you
• recheck your cover whenever you remortgage, borrow more or move.

How we are paid. There is no fee for our protection advice. We are paid by commission from the insurer you choose. If we are arranging your mortgage, protection advice is included at no extra cost.

Frequently asked questions

Speak to Option Finance about decreasing term life insurance

Tell us about your mortgage and who would need the home if something happened to you. We will match the cover to your loan, check the assumptions behind it and show you joint and single options side by side, with no obligation to go ahead.

Book a free initial consultation using the enquiry form below. See also our ultimate UK protection guide, remortgage advice and mortgage guide.