The core difference
Level term insurance pays out a fixed, unchanging amount if you die within the policy term. Decreasing term insurance pays out an amount that reduces over time, typically designed to mirror a shrinking repayment mortgage balance.
Why decreasing term suits repayment mortgages
As you pay down a repayment mortgage, the outstanding balance falls — decreasing term cover is structured to broadly track this, meaning the payout roughly matches what's still owed at any point, at a lower premium than level cover for the same starting amount, since the insurer's maximum liability shrinks over time too.
Why level term suits other needs
If your protection need doesn't shrink over time — replacing income for a fixed number of years, covering an interest-only mortgage (where the full balance remains outstanding throughout), or simply wanting a fixed amount to support dependants — level term cover matches that fixed need more accurately than a reducing payout would.
The cost trade-off
For the same starting sum assured and term, decreasing term is usually cheaper than level term, since the insurer's average exposure over the policy is lower with a shrinking payout. This isn't a reason to choose decreasing term if it doesn't actually match your need — a cheaper policy that under-delivers when needed isn't good value.
Matching the policy to the actual need
Before choosing, map out what you're actually protecting against — a specific debt balance schedule, a fixed income-replacement figure, or something else — and choose the policy type whose payout structure genuinely tracks that need over time, rather than choosing based on premium cost alone.
Key takeaways
- Level term pays a fixed amount throughout; decreasing term reduces over time.
- Decreasing term suits repayment mortgages, where the outstanding balance also falls over time.
- Level term suits fixed needs like interest-only mortgages or income replacement.
- Choose based on what you're actually protecting, not simply the cheaper premium.