1.2 Insurable Interest, Indemnity, and Other Insurance Principles

Insurable Interest

An insurable interest is a financial stake in the property or person such that the insured would suffer a genuine loss if a covered event occurred. Without it, a contract is a wager and is void.

Timing rule (memorize — heavily tested):

• Property & casualty: insurable interest must exist at the time of loss (it need not exist when the policy is issued).
• Life insurance: insurable interest must exist at the time of application (not at death).

In P&C, interest is limited to the amount of the financial stake — a part-owner of a building can only recover their share. Mortgagees, lienholders, and lessees all hold insurable interests.

The Principle of Indemnity

Indemnity means the insured is restored to the same financial position held before the loss — no better, no worse. The insured should not profit from a loss. Most P&C policies are contracts of indemnity, and several provisions enforce this principle:

• Deductibles — the insured retains the first dollars of loss.
• Other-insurance clauses (pro rata, contribution by equal shares).
• Subrogation — the insurer's right, after paying, to pursue the negligent third party. Prevents the insured collecting twice.
• Salvage — the insurer takes title to damaged property it has paid for in full.
• Coinsurance — penalizes underinsurance (see worked example below).

Valuation: ACV vs. Replacement Cost

• Actual Cash Value (ACV) = Replacement Cost − Depreciation. This is the indemnity standard.
• Replacement Cost (RC) = cost to repair/replace with new property of like kind and quality, without deduction for depreciation. RC exceeds indemnity, so it requires the insured to actually repair/replace.

Worked ACV example: A roof costs $20,000 new, has a 20-year life, and is 10 years old. Depreciation = 50%. ACV = $20,000 − $10,000 = $10,000.

Coinsurance — The Classic Numeric

Property policies use a coinsurance clause (commonly 80%, 90%, or 100%) to encourage insuring near full value. The penalty formula:

Payment = (Did Carry ÷ Should Carry) × Loss − Deductible

Worked example: A building is worth $500,000 with an 80% coinsurance clause. The insured should carry $400,000 but only carries $300,000. A $100,000 loss occurs (no deductible):

• Should carry = 80% × $500,000 = $400,000
• Payment = ($300,000 ÷ $400,000) × $100,000 = $75,000

The insured absorbs the $25,000 shortfall as a coinsurance penalty. Payment never exceeds the policy limit or the actual loss.

Stated Value and Valued Policies

A valued policy pays an agreed amount regardless of ACV (used for fine art, antiques). Some states have valued-policy laws that require payment of the full face amount on a total loss of real property by a covered peril — an exception to strict indemnity.

Other Insurance and the Limit on Recovery

Because indemnity bars profiting from a loss, other-insurance provisions coordinate payment when more than one policy covers the same loss. The three standard methods:

Worked pro rata example: A $60,000 loss is covered by Company A ($300,000 limit) and Company B ($100,000 limit), total $400,000. A pays (300/400) x $60,000 = $45,000; B pays (100/400) x $60,000 = $15,000. Neither the insured nor the insurers profit - the total paid equals the actual loss.

Reinsurance, Retention, and the Bigger Picture

Indemnity also explains why insurers themselves buy reinsurance - insurance for insurers. The ceding company transfers part of a risk to a reinsurer, keeping a retention (the amount it absorbs itself). Reinsurance lets a carrier write larger limits, smooth results, and survive catastrophes without violating the principle that each party is restored, not enriched.

Trap: Subrogation, salvage, other-insurance, and coinsurance are all indemnity-enforcing devices. If a question asks which provision prevents the insured from profiting, more than one answer can be correct in concept - read for the one the fact pattern actually triggers (double recovery from a third party = subrogation; two policies on one loss = other-insurance).

Actual Cash Value, Replacement Cost, and the Indemnity Line

Because indemnity restores rather than enriches, valuation methods sit on a spectrum. ACV (replacement cost minus depreciation) is the purest indemnity measure. Replacement cost intentionally exceeds strict indemnity - the insured gets new for old - which is why it requires the insured to actually repair or replace before the held-back depreciation is released. Agreed value and valued-policy statutes are further departures, paying a stipulated sum on a total loss.

Trap: Replacement cost is not a violation of indemnity in practice because the insured must spend the money to rebuild - the coverage prevents a windfall by paying ACV until repairs are completed.