1.2 Insurable Interest, Indemnity, and Other Insurance Principles

Insurable Interest

An insured must stand to suffer a genuine financial loss if the covered event occurs — that is insurable interest. Without it, a policy is an illegal wager. The timing rule differs by line:

• Property and casualty: insurable interest must exist at the time of loss (you can insure a building only while you own or have a stake in it).
• Life insurance: insurable interest must exist only at policy inception.

Sources of insurable interest in property include ownership, a mortgagee's secured interest, a tenant's interest in improvements, and a bailee's responsibility for others' property in their care.

The Principle of Indemnity

Indemnity restores the insured to the same financial position held immediately before the loss — never better. It blocks profiting from insurance and underpins most P&C valuation. Several mechanisms enforce it: deductibles, policy limits, ACV settlements, other-insurance clauses, and subrogation.

Valuation: ACV vs. Replacement Cost

Worked ACV example. A 10-year-old roof costs $20,000 to replace and has a 20-year useful life. Depreciation = 10/20 = 50 percent.

• ACV = $20,000 − ($20,000 × 0.50) = $10,000

Under an RCV policy the insurer first pays ACV ($10,000), then releases the depreciation holdback ($10,000 more) once the insured actually completes the repair.

The Coinsurance Clause

Property policies require the insured to carry insurance equal to a stated percentage — usually 80 percent — of the property's replacement cost. Carry less and a coinsurance penalty reduces a partial-loss payment.

Coinsurance formula: Payment = (Insurance Carried ÷ Insurance Required) × Loss − Deductible, capped at the policy limit.

Worked coinsurance example. A building's replacement cost is $500,000. The 80 percent clause requires $400,000 of coverage. The owner buys only $300,000. A fire causes a $100,000 loss; the deductible is $1,000.

• Did/Should ratio = $300,000 ÷ $400,000 = 0.75
• Payment = 0.75 × $100,000 − $1,000 = $74,000

The insured eats the $25,000 penalty plus the deductible for being underinsured. Trap: coinsurance applies to partial losses; a total loss pays the full limit regardless.

Other Insurance, Subrogation, and the Limit

When two policies cover the same loss, other-insurance clauses prevent the insured from collecting twice (a breach of indemnity):

• Pro rata — each insurer pays its share of the limit it wrote. If Policy A is $100,000 and Policy B is $300,000 on a $40,000 loss, A pays $10,000 (25%) and B pays $30,000 (75%).
• Contribution by equal shares — each insurer pays equally until its limit or the loss is exhausted.
• Primary/excess — one policy pays first; the other pays only above the first's limit.

Subrogation lets the insurer, after paying the insured, step into the insured's legal shoes and recover from the at-fault third party. The insured may not waive subrogation after a loss or accept payment from the wrongdoer that defeats it — both would create double recovery.

Supporting Principles That Reinforce Indemnity

Four related doctrines round out the indemnity family and appear constantly in scenario questions:

• Principle of insurable interest (above) — no interest, no valid claim, because there is no genuine loss to indemnify.
• Principle of utmost good faith — both parties must deal honestly; material concealment or misrepresentation lets the insurer rescind, protecting the integrity of the indemnity bargain.
• Doctrine of proximate cause — coverage turns on the efficient, unbroken cause that set the chain of events in motion. If a covered peril (lightning) starts a fire that spreads, the loss is covered even though the immediate cause was smoke and heat; if an excluded peril (flood) is the proximate cause, the loss is excluded.
• Collateral source rule vs. subrogation — in liability claims a wrongdoer generally cannot reduce damages because the victim had insurance, but the victim's insurer recovers through subrogation, so the insured is made whole only once.

Stated Value, Valued Policies, and Exceptions to Indemnity

Not every policy pays strict indemnity. The exam expects three recognized exceptions:

Valued-policy-law trap: Several states (and many exam items) require that on a total loss of real property by a covered peril, the insurer pay the full face amount stated on the declarations rather than ACV. This is a statutory carve-out from pure indemnity and a favorite distractor.

Bottom line: indemnity is the default rule, but replacement cost, agreed value, and valued policies deliberately pay more than strict ACV to better serve the insured — and the exam wants you to recognize each by name.