1.2 Insurable Interest, Indemnity, and Other Insurance Principles
Key Takeaways
- In P&C, insurable interest must exist at the TIME OF LOSS; in life insurance, only at policy inception.
- The principle of indemnity restores the insured to the pre-loss financial position — no profit from a loss.
- ACV = Replacement Cost - Depreciation; replacement cost coverage usually withholds depreciation until repair.
- Coinsurance payment = (amount carried / amount required) x loss, then subtract the deductible.
- Subrogation lets the insurer recover from a negligent third party; the insured must not impair that right.
Insurable Interest
Insurable interest means the insured would suffer a genuine financial loss if the covered property were damaged or destroyed. Without it, a policy is an unenforceable wager. The exam tests when insurable interest must exist, and property/casualty differs from life:
- Property & casualty: insurable interest must exist at the time of loss (you can insure a building you plan to buy, but you collect only if you still own it when it burns).
- Life insurance: insurable interest must exist only at the inception of the policy (at application).
For P&C, common bases of insurable interest include ownership, a mortgagee's secured interest, a bailee holding others' property, and a lessee's interest in improvements.
Principle of Indemnity
The principle of indemnity is the backbone of property insurance: the insured should be restored to the same financial condition that existed immediately before the loss — no better, no worse. You should not profit from a loss. This principle drives valuation rules (ACV, replacement cost), policy limits, and the next several doctrines below.
Worked Example — Actual Cash Value (ACV)
ACV = Replacement Cost − Depreciation. Suppose a roof costs $20,000 to replace, has a 20-year life, and is 10 years old.
- Depreciation = 10/20 = 50%
- ACV = $20,000 − (50% × $20,000) = $10,000
Under an ACV policy the insurer pays $10,000 (less any deductible). Under a replacement cost policy the insured can recover the full $20,000, but typically must actually repair or replace first to collect the depreciation holdback.
A 10-year-old roof with a 20-year useful life costs $20,000 to replace. The policy pays actual cash value with a $1,000 deductible. What does the insurer pay?
Supporting Doctrines That Enforce Indemnity
Several doctrines exist specifically to prevent the insured from profiting and to keep loss with the responsible party:
| Principle | What it does | Exam cue |
|---|---|---|
| Subrogation | Insurer steps into the insured's legal rights to recover paid losses from a negligent third party | Insurer sues the at-fault driver after paying its own insured |
| Contribution / Other Insurance | When two+ policies cover the same loss, each pays its pro-rata share | Prevents double recovery across overlapping policies |
| Salvage | Insurer takes title to damaged property it has paid for | Totaled car becomes insurer's property |
| Coinsurance | Penalizes underinsurance on property below the required percentage | See worked penalty below |
Key rule: after the insurer pays under subrogation, the insured may not also collect from the negligent party or release that party — doing so impairs the insurer's recovery and breaches the policy condition.
Coinsurance — The Most-Tested Calculation
Commercial property and HO policies use a coinsurance clause (commonly 80%, 90%, or 100%) requiring the insured to carry insurance equal to a stated percentage of the property's value. If they carry less, a penalty applies at every loss.
Formula: Payment = (Amount Carried ÷ Amount Required) × Loss − Deductible
Worked Example
A building is worth $500,000 with an 80% coinsurance clause, so the required amount is $400,000. The owner carries only $300,000. A $100,000 loss occurs (no deductible):
- Did/Should ratio = $300,000 ÷ $400,000 = 0.75
- Payment = 0.75 × $100,000 = $75,000
- The insured absorbs the remaining $25,000 as a coinsurance penalty.
Note: the payment can never exceed the policy limit or the actual loss, whichever is less.
A building valued at $500,000 has an 80% coinsurance clause. The owner insures it for $300,000 and suffers a $100,000 loss (no deductible). How much does the insurer pay?
Stated Value and Valued Policies
Not every loss follows pure indemnity. A valued policy (used for fine art, antiques, and required by some states' valued-policy laws for total fire losses to buildings) pays an agreed amount regardless of ACV. A stated amount auto policy similarly fixes value up front. These are exceptions to strict indemnity and are tested as such — when a question describes art or a collector vehicle insured for a set agreed sum, think valued policy, not ACV.
When Insurable Interest Must Exist — Property vs. Life
Timing is a classic distinction. In property and casualty insurance, insurable interest must exist at the time of the loss (you must suffer a financial loss when the property is damaged). In life insurance, it must exist only at the inception of the policy. P&C is the exam's focus, so anchor the rule: a buyer who sells a building and later watches it burn has no insurable interest at the time of loss and collects nothing.
Insurable interest in property can arise from ownership, a secured creditor's interest (a mortgagee or lienholder), a leasehold interest, a bailee's responsibility for others' property, or contractual liability. More than one party can hold an insurable interest in the same property at the same time — owner and mortgagee both do, which is why the standard mortgage clause protects the lender separately.
How Indemnity Limits a Recovery
The principle of indemnity restores the insured to the same financial position held before the loss — no better, no worse. It prevents profiting from a loss and is enforced by several supporting doctrines tested together:
| Doctrine | Effect |
|---|---|
| Insurable interest | You can only collect for a loss you actually suffer |
| Actual cash value | Pays replacement cost minus depreciation |
| Other-insurance / pro rata | Multiple policies share, they do not stack to overpay |
| Subrogation | Insurer recovers from the at-fault party so the insured is not paid twice |
| Salvage | Insurer takes damaged property it paid for in full |
Trap: A valued policy or an agreed-value auto/fine-arts form is a recognized exception to strict indemnity — it pays a stated amount regardless of ACV. Replacement cost coverage is technically a deviation too, paying more than ACV to make rebuilding feasible, which is why it requires meeting the coinsurance/replacement-cost condition.