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Property and Casualty Insurance · Property Insurance · 6 min read

Sharing Claims Across Contracts

In this lesson you will
  • Explain how other insurance clauses uphold the principle of indemnity and prevent double recovery when multiple policies apply to a covered loss.
  • Calculate claim payments under primary and excess coverage, pro rata apportionment, and contribution by equal shares.
  • Identify the causes and potential consequences of nonconcurrent coverage across overlapping property insurance policies.

The Principle of Indemnity and Other Insurance

A basic rule of property insurance is the principle of indemnity, which holds that insurance should restore you to your pre-loss financial position rather than provide a financial gain. When multiple policies cover the exact same property loss, an insured person might hope to collect the full claim amount from every insurer. To prevent this type of duplicate recovery, many property policies include other insurance clauses.

Other insurance clauses allocate overlapping coverage and help prevent recovery beyond the actual covered loss. If you purchase duplicate coverage unknowingly, other insurance provisions stop you from receiving double payment on the exact same physical damage. Standard fire policy provisions historically used pro rata clauses to divide covered losses when other insurance applied, maintaining this balance.

Overinsurance occurs when the total insurance purchased on the same property interest exceeds its insurable value. Even when overinsurance exists, it does not permit recovery beyond a covered loss. Property insurers use other insurance clauses to allocate a covered loss among policies and prevent duplicate recovery. When multiple policies cover the same loss, their other insurance provisions and applicable law help determine how the insurers share payment.

Exam tip. Remember that an other insurance clause upholds indemnity by barring double recovery. If a scenario shows an insured trying to collect a full payout from two separate insurers for one physical damage loss, other insurance clauses step in to allocate the payment so total recovery does not exceed the covered loss.

Common mistakes

  • Assuming buying two primary policies automatically turns one into excess coverage; policy wording determines the actual payment order.
  • Believing that an insured only pays one deductible across multiple overlapping property policies, rather than applying each deductible according to policy terms and applicable law.
  • Thinking that different policy inception dates automatically make coverage nonconcurrent, even when the perils, valuation, and coverage basis are identical.
  • Applying contribution by equal shares to standard ISO commercial property policies instead of proportional sharing on the same basis.

Key points

  • Other insurance clauses enforce the principle of indemnity by preventing double recovery when multiple policies cover the same physical damage.
  • Primary insurance pays first up to its limit, while excess insurance pays only after a loss exceeds its attachment point.
  • Pro rata apportionment allocates covered losses based on each insurer's limit relative to total available limits, up to individual policy limits.
  • Contribution by equal shares splits losses dollar-for-dollar among insurers until the loss is satisfied or limits are exhausted.
  • Standard ISO commercial property forms use proportional sharing when other insurance covers a loss on the same basis, and excess sharing when on a different basis.
  • Nonconcurrent coverage occurs when differences in covered perils, valuation, or the periods during which coverage applies affect how policies respond to a loss; those differences can leave part of the loss unpaid.
  • Each property policy's deductible applies according to its specific terms and applicable law, with no universal single-deductible rule.

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Original lesson written for Property and Casualty Insurance practice · updated October 30, 2026. Exam names are trademarks of their owners; tests.global is not affiliated with them.