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Insurance, explained

Coinsurance: property

In property insurance, coinsurance can mean a clause that makes the insured bear part of a loss when the declared or insured value falls below the value required by the policy.

Business owner discussing insurance documents with an adviser
BAU Risk Services — insurance brokerage

01 / The meaning

What it means.

Australian commercial wordings often call this an average or underinsurance clause. It can affect a partial loss, not just the amount available after a total destruction. The calculation depends on the required valuation basis, any percentage tolerance, the relevant property grouping and the precise formula. A business should not assume a single percentage or calculation applies across every property policy.

Valuation errors can arise when equipment is recorded at depreciated book value while the policy requires a replacement basis. New fitouts, freight, installation costs and rising construction prices may also change the amount needed. Separate stock declarations and seasonal increases require their own review. This use of coinsurance is different from several insurers sharing a placement; both concepts can appear in the same insurance programme and should be explained separately.

02 / Put it in context

A practical example.

Hypothetical example

Hypothetical example: A workshop insures machinery using an old asset register. After a small fire, a valuation shows the policy’s required machinery value was substantially higher. An applicable average clause could reduce the assessed loss, subject to its formula and exceptions.

This example illustrates the term. It does not predict a claim outcome.

03 / Read the detail

What to check.

04 / Start a useful conversation

A question for your broker.

Could inadequate declared values reduce a claim for only part of the property?

Further reading

Read the source guidance alongside the relevant policy wording.

General information only. This does not take into account your objectives, financial situation or needs. Before acting, consider whether the information is appropriate for you. Cover is subject to insurer acceptance and the policy terms, conditions, limits and exclusions. Read the Financial Services Guide and the relevant PDS (where applicable) and/or policy wording before deciding.

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