The excess is the most under-used lever on a policy

This looks at policy excess from the practical end — what holds up once conditions stop being ideal.

Two excesses, added together

A compulsory excess is set by the insurer and cannot be changed; a voluntary excess is chosen by you. At a claim they are added, so a small compulsory excess plus a large voluntary one produces a large total. Quotes frequently display only one of them, which makes cross-comparison misleading unless you check both.

The compulsory element is rated rather than chosen, so it rises for young or newly licensed drivers, for high-value or modified vehicles and after certain claims, which means a quote can look cheap purely because the part you cannot alter is large.

Small claims are rarely worth making

A claim affects the no-claims discount and the premium at renewal, often for several years. Once the lost discount is counted, claiming for a sum close to the excess frequently costs more than it recovers. Because of that, cover for small losses has little practical value, which is exactly what raising the excess disposes of.

In practice, not claiming is not the same as not declaring, though, because most policies require any incident to be notified whether or not a claim follows and proposal forms typically ask about accidents rather than about claims, so an unreported bump can turn into a non-disclosure problem at a later loss.

Setting it sensibly

The useful test is the largest amount you could pay tomorrow without borrowing or distress. Setting the excess at that level buys the biggest premium reduction you can safely accept. Setting it higher than you could actually pay converts an insured loss into an uninsured one.

In practice, the right level moves with circumstances rather than staying fixed, since the excess that was comfortable while two people were earning is not the same one after a job change or a rise in mortgage payments, and it is one of the few policy terms that can simply be lowered again at the next renewal at a price you can see in advance.

Protected no-claims is a separate product

Protecting a discount preserves it through a stated number of claims, and it does not stop the underlying premium rising. It is priced as an add-on and is worth comparing against simply accepting the discount loss. Insurers rate on claims history regardless of whether the discount is protected.

The reason protection delivers less than it appears to is structural: the discount is a percentage taken off a base premium the insurer sets, so protecting the percentage while the base rises leaves you paying more with the discount formally intact, and how many years another insurer will recognise at all varies when you switch.

Where excesses surprise people

Some policies apply a higher excess to specific causes — escape of water, subsidence, young drivers, windscreen claims. These are in the schedule and are commonly missed because the headline excess looks low.

For most people, checking the cause-specific excesses is part of comparing two quotes honestly. An insurer can also impose a cause-specific excess partway through the relationship, usually by endorsement at renewal following a claim or a survey, so the excess checked at purchase is not necessarily the excess in force three years later.

Adjust the size of it until it is something you would actually do tired.

How the excess behaves at the claim rather than at the quote

On a non-fault motor claim the excess is commonly deducted at the outset and refunded later, once the insurer has recovered from the other party, which surprises people who assumed it simply would not apply. Where that recovery fails — an untraced or uninsured driver, a liability the other insurer disputes — the excess stays with you, and in some markets a separate excess protection product exists specifically to cover that gap. Excesses apply per claim rather than per policy year in most wordings, and on a home policy they can apply per section, so one event damaging both the structure and the contents may attract two deductions rather than one.

Put simply, a few wordings apply the excess per specified item rather than per incident, which turns a single burglary into several deductions, and that is settled in the schedule rather than by assumption.

The takeaway

Set the excess at the largest amount you could pay tomorrow, and stop insuring inconveniences.

The version you keep doing is the version that works.