PERSONAL LINES PROVISIONS · 5 MIN READ
Other Insurance and Priority of Coverage
When more than one policy covers the same loss, the Other Insurance clauses decide who pays what — and the homeowners form uses different rules for property and liability. Under Section I (property), the clause is pro rata by limits: each concurrent policy pays the proportion of the loss that its limit bears to the total limits in force. The math is mechanical. Two policies of $300,000 and $200,000 share a $50,000 loss: total limits are $500,000, so the first pays 300/500 of the loss — $30,000 — and the second pays the remaining $20,000. The clause enforces indemnity by preventing double recovery and spreads responsibility equitably among same-priority insurers. Section II (liability) works the opposite way: the homeowners coverage is excess over any other valid and collectible insurance — with one carve-out. Insurance written specifically as excess over the homeowners limits, such as a personal umbrella, does not trigger the clause; otherwise the umbrella and the HO would each point at the other forever. So when a watercraft, auto, or event-liability policy also covers a Section II loss, that more specific policy pays first and the HO drops down only after it exhausts. The same specific-over-general logic appears on the property side: when a personal auto policy's physical damage coverage reaches a borrowed trailer, the auto policy is primary as the more specific contract and the HO Coverage C responds as excess. The classic puzzle is the standoff: two policies each declaring themselves excess over the other, as when a borrower's and an owner's homeowners policies both cover liability from a borrowed lawnmower. The clauses are logically irreconcilable — each presupposes the other is primary — so courts treat them as mutually repugnant, disregard both, and fall back to equitable apportionment, usually pro rata by limits or equal shares depending on the jurisdiction. The insured is fully protected either way; only the insurer-versus-insurer allocation is at stake.
Key rules
Section I shares concurrent losses pro rata by limits.
Each policy pays the fraction of the loss equal to its limit over the total of all limits — the (limit ÷ total limits) × loss formula.
Why the exam cares: The pro-rata calculation is a near-guaranteed math item on the provisions section.
Section II is excess over other collectible insurance, except true excess policies.
More specific liability policies pay first and the HO drops down; umbrellas written specifically excess of the HO sit above it, preserving the tower.
Why the exam cares: Exams test both the excess default and the umbrella carve-out that prevents a loop.
The more specific policy is primary; the more general policy is excess.
A personal auto policy covering a borrowed trailer pays before the HO's general off-premises property coverage.
Why the exam cares: Specific-versus-general priority resolves most two-policy scenarios without further analysis.
Conflicting excess clauses cancel each other and courts prorate.
When each policy claims to be excess over the other, the mutually repugnant clauses are disregarded and the loss is equitably apportioned, typically pro rata by limits or equal shares.
Why the exam cares: The mutually-repugnant doctrine is the tested resolution to the excess-versus-excess standoff.
Other-insurance clauses protect indemnity — the insured never collects twice.
Whatever the allocation among insurers, total recovery is capped at the actual loss; only the carriers' shares are in dispute.
Why the exam cares: Answer choices letting the insured recover from both policies in full are always wrong.
Numbers to memorize
- (policy limit ÷ total limits) × loss — the pro-rata-by-limits sharing formula
- $30,000 — the $300,000 policy's share of a $50,000 loss when limits total $500,000
Common traps
- Applying pro rata to Section II liability losses — property (Section I) shares pro rata, but liability (Section II) is excess over other collectible insurance.
- Making the HO excess over its own umbrella — insurance written specifically excess of the HO does not trigger the excess clause.
- Splitting excess-versus-excess standoffs by declaring one policy the winner — mutually repugnant clauses are both disregarded and the loss is prorated.
- Letting the insured collect the full loss from each concurrent insurer — other-insurance clauses exist precisely to prevent double recovery.
Before any allocation math, label each policy specific or general and each clause pro rata or excess — the labels decide priority before the arithmetic starts.
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