When does level term cover make more sense than decreasing term cover?

Level term suits obligations that do not shrink over time, such as replacing family income, covering ongoing childcare costs, or protecting an interest-only mortgage where the balance stays the same until it is repaid in full. Because the sum assured stays fixed throughout the term, it can also cover needs beyond a single debt. Decreasing term, by contrast, is designed around a shrinking obligation, so using it for a need that does not shrink can leave a gap in later years. The type of obligation, not habit, should decide the structure.

Why is decreasing term life insurance usually cheaper than level term?

The insurer’s potential liability under a decreasing term policy falls every year on a set schedule, so the amount it might eventually have to pay shrinks steadily over the term. Pricing a shrinking eventual liability costs less than pricing a sum that stays the same throughout, which is why decreasing term is cheaper for the same starting figure. This is also why it is commonly sold alongside repayment mortgages, where the outstanding debt itself falls in a broadly similar pattern as monthly payments are made.

How can a decreasing term policy end up leaving a shortfall against a mortgage?

A decreasing term policy’s schedule assumes a particular interest rate, which is set out in the policy illustration rather than tied to your actual mortgage. If your real mortgage rate runs higher than that assumption, the outstanding balance can fall more slowly than the cover does, opening a gap between what is owed and what the policy would pay. Checking the assumed decrease rate against your current mortgage rate before buying, and again if your rate changes, is the only way to catch this early.

Life insurance

Level vs decreasing term life insurance: what’s the difference?

The short answer

Both are term policies, but a level term sum assured stays fixed for the whole term, while a decreasing term sum falls over the years, broadly tracking a repayment mortgage balance. Because the insurer’s potential liability shrinks each year, decreasing term costs less for the same starting figure.

Written by Ilana Eldad. Reviewed by Muhammad Junaid.

Published 15 September 2026. Last reviewed 15 September 2026. Next review due 15 December 2026.

What to know about the difference between level and decreasing term cover

Level term pays the same sum throughout the term, suiting needs that do not shrink over time. Read more
Decreasing term’s sum assured falls on a set schedule, broadly shadowing a repayment mortgage balance. Read more
The insurer’s shrinking liability each year is why decreasing term costs less than level cover. Read more
A policy’s assumed decrease rate may not match your actual mortgage rate, leaving a cover gap. Read more

Thinking about the difference between level and decreasing term cover

What works well

Decreasing term matches a repayment mortgage cheaply.
Level term suits needs that do not shrink, like family income.
The structure choice is visible in the illustration before you buy.

What to watch

The decrease rate may not match your actual mortgage rate.
Decreasing cover leaves nothing over once the mortgage is cleared.
A level sum loses real value to inflation over long terms.

A fixed promise versus a shrinking one

A level term policy promises the same sum in year one as in the final year, which suits obligations that do not shrink: family income, childcare costs, an interest-only mortgage. A decreasing term policy promises a sum that falls on a set schedule, designed to shadow a repayment mortgage as monthly payments erode the balance. The design assumption matters: the policy’s decrease rate assumes a mortgage interest rate, and if your actual mortgage rate runs higher, the cover can fall faster than the debt — a gap worth checking on the policy illustration. For anything other than a repayment mortgage, level cover is usually the honest structure, because most family needs do not shrink on a schedule. Inflation also works on a level sum over a long term, which is why some policies offer an increasing or index-linked option at higher cost. The assumed decrease rate appears on the insurer’s own policy illustration, not in any published market table.

If the cover is for a repayment mortgage, ask for the policy’s assumed decrease rate and compare it with your actual mortgage rate before buying. Whatever the specifics of the difference between level and decreasing term cover, the discipline that protects your family is always the same: get the insurer’s position in writing, keep the documents with the policy, and make sure the people who would claim know the policy exists and where the paperwork lives.

Related guides

Common questions

When does level term cover make more sense than decreasing term cover?: Level term suits obligations that do not shrink over time, such as replacing family income, covering ongoing childcare costs, or protecting an interest-only mortgage where the balance stays the same until it is repaid in full. Because the sum assured stays fixed throughout the term, it can also cover needs beyond a single debt. Decreasing term, by contrast, is designed around a shrinking obligation, so using it for a need that does not shrink can leave a gap in later years. The type of obligation, not habit, should decide the structure.
Why is decreasing term life insurance usually cheaper than level term?: The insurer’s potential liability under a decreasing term policy falls every year on a set schedule, so the amount it might eventually have to pay shrinks steadily over the term. Pricing a shrinking eventual liability costs less than pricing a sum that stays the same throughout, which is why decreasing term is cheaper for the same starting figure. This is also why it is commonly sold alongside repayment mortgages, where the outstanding debt itself falls in a broadly similar pattern as monthly payments are made.
How can a decreasing term policy end up leaving a shortfall against a mortgage?: A decreasing term policy’s schedule assumes a particular interest rate, which is set out in the policy illustration rather than tied to your actual mortgage. If your real mortgage rate runs higher than that assumption, the outstanding balance can fall more slowly than the cover does, opening a gap between what is owed and what the policy would pay. Checking the assumed decrease rate against your current mortgage rate before buying, and again if your rate changes, is the only way to catch this early.