1.2 Insurable Interest, Indemnity, and Other Insurance Principles

Insurable Interest

An insured must have an insurable interest — a financial stake such that the loss of the property causes the insured genuine economic harm. Ownership, a mortgage lien, a lease, or a secured creditor relationship all create insurable interest. Without it, a policy is an unenforceable wager.

Key timing rule: In property and casualty insurance, insurable interest must exist at the time of loss (it need not exist when the policy is issued). This differs from life insurance, where insurable interest need only exist at inception. The amount you can recover is limited to the extent of your insurable interest — a mortgagee can recover only up to its outstanding loan balance.

The Principle of Indemnity

Indemnity restores the insured to the financial condition enjoyed immediately before the loss — no better, no worse. P&C contracts are contracts of indemnity, not valued payouts, so the insured cannot profit from a loss. Several doctrines enforce indemnity:

• Subrogation — after paying a claim, the insurer steps into the insured's legal rights to recover from a negligent third party. The insured cannot collect twice (once from the insurer, once from the wrongdoer) and must not impair the insurer's recovery rights.
• Other-insurance / pro rata — when two policies cover the same loss, each pays its proportional share so total recovery never exceeds the loss.
• Coinsurance — penalizes underinsurance on property (covered in 1.2 numerics below).

Actual Cash Value (ACV)

ACV = Replacement Cost − Depreciation. A roof costing $20,000 new, 50% depreciated, settles at $10,000 ACV. Replacement Cost (RC) pays to repair/replace with like kind and quality without depreciation, subject to policy limits and coinsurance.

Worked Numeric: Coinsurance

Property policies often carry an 80% coinsurance clause. The formula:

Payment = (Carried Limit ÷ Required Limit) × Loss − Deductible, capped at the policy limit.

A building valued at $500,000 needs $400,000 of coverage (80%). The owner carries only $300,000. A $100,000 loss occurs with a $1,000 deductible.

• Required = $500,000 × 80% = $400,000
• Penalty ratio = $300,000 ÷ $400,000 = 0.75
• Payment = 0.75 × $100,000 − $1,000 = $74,000

The insured is penalized $26,000 for underinsuring. Had they carried $400,000+, the loss would pay $99,000 (full loss minus deductible).

Other Core Principles

Stated Value, Agreed Value, and Valued Policies

While indemnity is the default, some contracts modify valuation:

• Agreed value — insurer and insured fix the property's value at inception (common on fine art, antiques, classic autos), waiving coinsurance.
• Stated amount — a maximum the insurer will pay, often used on commercial property where exact value is hard to set; the insurer pays the lesser of stated amount, ACV, or repair cost.
• Valued policy laws — in many states, for a total loss to real property by fire, the insurer must pay the full face amount regardless of ACV, preventing post-loss disputes.

Worked Numeric: ACV Settlement

A five-year-old roof has a 20-year useful life and a replacement cost of $24,000. Depreciation = 5/20 = 25%, so depreciation = $6,000. ACV = $24,000 - $6,000 = $18,000. With a $1,000 deductible, the ACV claim pays $17,000. On a replacement-cost policy, the insurer typically pays ACV first ($18,000 - $1,000 = $17,000), then the recoverable depreciation ($6,000) once repairs are completed and receipts submitted, for $23,000 total. This holdback discourages pocketing the depreciation without repairing.

Other-Insurance Clauses in Detail

When more than one policy covers the same loss, indemnity is preserved by other-insurance provisions that allocate payment:

• Pro rata — each policy pays the proportion its limit bears to the total of all limits. Two policies of $100,000 and $300,000 cover a $40,000 loss: the first pays 100/400 x $40,000 = $10,000; the second pays 300/400 x $40,000 = $30,000.
• Contribution by equal shares — each insurer pays equally until the smaller limit exhausts, then the larger continues.
• Primary and excess — one policy pays first; the other pays only after the primary limit is exhausted.
• Escape (anti-stacking) — a policy provides no coverage if other valid insurance exists.

The No-Profit Rule and Valued Exceptions

Indemnity forbids profiting from a loss, which is why a claimant who recovers from both the insurer and a negligent third party must reimburse the insurer through subrogation. The chief exception is the valued policy (life insurance, agreed-value art), where a fixed sum is paid without proof of actual value because measuring the loss precisely is impractical. On the exam, if a fact pattern lets the insured end up financially better off than before the loss, the answer almost always involves a violated indemnity doctrine — subrogation, coinsurance, or an other-insurance clause.

Subrogation, Contribution, and the Anti-Profit Engine

Indemnity is enforced through three supporting doctrines the exam pairs together. Subrogation lets the insurer, after paying, step into the insured's shoes to recover from the negligent third party; the insured may not waive subrogation after a loss or impair it, and any recovery beyond the insurer's payment belongs to the insured. Contribution (the other-insurance condition) stops an insured from collecting the same loss twice when two policies overlap — payment is shared pro rata or by equal shares. Salvage lets the insurer take title to damaged property it has paid for in full.

Two valuation exceptions deliberately depart from strict indemnity: a valued policy pays an agreed amount regardless of actual loss (common in ocean marine and fine arts), and a replacement-cost provision pays new-for-old, both of which can exceed actual cash value. Stated value and agreed value endorsements similarly fix the recovery in advance.