Per-Occurrence Limit: Definition and How It Works

A per-occurrence limit is the maximum dollar amount an insurer will pay for all covered damages — bodily injury, property damage, defense costs (if included within limits), and any applicable sub-limits — that arise out of a single occurrence. An "occurrence" is generally defined in commercial policies as an accident, event, or continuous or repeated exposure to conditions that results in bodily injury or property damage that is neither expected nor intended by the insured (ISO CG 00 01). No matter how many injured parties, property owners, or claimants arise from a single occurrence, the per-occurrence limit is the total the insurer will pay for that event. It is the per-event ceiling, while the aggregate limit is the per-year ceiling for all occurrences combined.

How the Per-Occurrence Limit Works

When a covered loss occurs, the insurer's obligation for that event is capped at the per-occurrence limit. The insured (or injured third parties) absorbs any loss exceeding that cap unless additional layers — an umbrella or excess policy — are in place to pick up above it.

Example: A commercial general liability (CGL) policy with a $1,000,000 per-occurrence limit and a $2,000,000 general aggregate covers a slip-and-fall on the insured's premises. Three claimants are injured in the same incident. Their combined damages — medical costs, lost wages, pain and suffering — total $1,400,000. The insurer pays $1,000,000 (the per-occurrence cap). The insured is responsible for the remaining $400,000 out of pocket, unless an umbrella policy with a $1,000,000 per-occurrence attachment point above the primary limit steps in to cover the gap.

The per-occurrence limit is consumed from the general aggregate. After paying $1,000,000 for that event, only $1,000,000 remains in the annual aggregate for subsequent claims.

Per-Occurrence vs. Per-Claim: The Trigger Distinction

The terminology varies by coverage type and policy trigger:

For claims-made policies — E&O, D&O, cyber — the "per-claim" limit applies to one claim or related claims arising from a single wrongful act or series of related acts. Multiple claimants alleging the same wrongful act are typically treated as one claim under most professional liability forms, subject to the policy's "related claims" or "interrelated acts" provision. This distinction matters when a firm faces a class action or multiple complaints arising from the same error.

For occurrence-triggered policies — CGL, most commercial auto, workers' compensation employers' liability — the per-occurrence limit applies to a single event regardless of how many parties are harmed.

Interaction with the Aggregate Limit

The per-occurrence limit and aggregate limit operate as two independent constraints on the insurer's total obligation:

• Per-occurrence: No single event generates more than this amount in insurer payments
• Aggregate: No policy year generates more than this amount in total insurer payments across all occurrences

A typical CGL policy sets the aggregate at 2× the per-occurrence limit (e.g., $1M per-occurrence / $2M aggregate). This ratio reflects the actuarial assumption that a business with a $1M per-occurrence exposure is unlikely to sustain more than two such events in a single year. High-frequency, low-severity risks (slip-and-fall, minor property damage) can exhaust the aggregate through volume even when no single claim approaches the per-occurrence cap. Low-frequency, high-severity risks (catastrophic injury, product recall) are more likely to exhaust the per-occurrence limit on a single event.

If the aggregate is exhausted before year-end, the per-occurrence limit is irrelevant — the policy is depleted regardless of how large or small the next occurrence is.

Per-Occurrence Limit in Umbrella and Excess Towers

Umbrella insurance and excess liability policies add capacity above the primary per-occurrence and aggregate limits. The attachment point of the umbrella or excess policy is typically the per-occurrence limit of the underlying primary policy.

Example of a layered tower:

If a single occurrence generates $4,000,000 in damages, the primary CGL pays $1,000,000 and the umbrella pays the next $3,000,000, for a total insured recovery of $4,000,000. The per-occurrence limit of each layer controls how the tower responds.

When structuring layered towers for large commercial risks — construction, hospitality, manufacturing — confirming that each layer's per-occurrence limit matches (or exceeds) the attachment point of the layer above is a fundamental placement task. A gap between layers, where the primary limit is lower than the excess attachment point, creates a corridor of uninsured exposure. See Excess Casualty Layered Towers for how this plays out in the current market.

Per-Occurrence Limit and Deductibles / SIRs

The insurance deductible and self-insured retention (SIR) interact with the per-occurrence limit in different ways:

• Deductible: The insurer pays the full loss up to the per-occurrence limit and then recovers the deductible amount from the insured. The per-occurrence limit represents the gross insurer payment before deductible recovery.
• SIR: The insured pays losses up to the SIR before the insurer's obligation begins. The per-occurrence limit applies to the insurer's layer — the insured's SIR sits beneath it. A $1,000,000 per-occurrence policy with a $250,000 SIR means the insured pays the first $250,000 and the insurer pays up to $1,000,000 above that, for a maximum combined payout (insured + insurer) of $1,250,000 per occurrence.

High-SIR structures are common for large accounts seeking premium reduction. The effective per-occurrence protection from the insurer does not change — but the insured's first-dollar exposure increases.

Related Terms

• Aggregate Limit — the per-year ceiling that caps total insurer payments across all occurrences; interacts directly with the per-occurrence limit to define the full scope of policy capacity
• Occurrence Policy — the coverage trigger that determines which policy year's per-occurrence limit applies based on when the event happened
• Claims-Made Policy — uses per-claim rather than per-occurrence terminology; understanding the distinction is essential for professional liability placements
• Umbrella Insurance — adds per-occurrence and aggregate capacity above the primary limits in a layered tower structure
• Commercial General Liability — the standard commercial liability form where per-occurrence limits are most commonly encountered
• Insurance Deductible — interacts with per-occurrence limits; deductibles reduce net insurer cost while SIRs shift first-dollar payment to the insured
• Self-Insured Retention (SIR) — the insured pays defense and indemnity up to the SIR before the insurer's per-occurrence limit attaches; distinct from a deductible in claim control and collateral requirements

How Insurance Brokers Use Per-Occurrence Limits in Practice

The per-occurrence limit is the single most important number on a commercial liability policy for clients with catastrophic loss exposure. For most clients, it determines the maximum recovery from a single serious event — a severe injury on premises, a product defect causing multiple hospitalizations, a construction collapse.

Brokers should evaluate per-occurrence adequacy against three benchmarks:

1. Contractual requirements: Project owners, landlords, and lenders frequently specify minimum per-occurrence limits in contracts. A client with a $1,000,000 per-occurrence CGL may be contractually non-compliant on a project requiring $2,000,000. See Certificate of Insurance for how these requirements flow through to COI issuance.

2. Industry loss data: Workers' compensation carriers and reinsurers publish severity data by industry class. A contractor in a high-fall-hazard trade faces higher expected single-occurrence severity than a retail operation. Per-occurrence limits should be set against industry maximum probable loss, not arbitrary round numbers.

3. Net worth and balance sheet: The uninsured portion of any occurrence — the amount above the per-occurrence limit before the umbrella attaches — comes directly from the insured's balance sheet. A client with $500,000 in net worth who sets a per-occurrence limit at $500,000 is effectively betting the business on no single event exceeding that threshold.

At renewal, the per-occurrence limit conversation should occur before the aggregate conversation — once the per-event exposure is right-sized, the aggregate follows naturally from claims frequency assumptions.