Liability Insurance Policy Limits: Per-Occurrence and Aggregate Explained

Liability insurance policy limits define the maximum dollar amounts an insurer will pay under a policy, and understanding how those limits are structured is foundational to evaluating whether a policy provides adequate protection. Two limits appear in virtually every commercial liability policy: the per-occurrence limit and the aggregate limit. These figures govern how claims are paid, how quickly coverage can be exhausted, and whether gaps exist that require supplemental coverage through umbrella liability insurance or excess liability insurance.

Definition and scope

A per-occurrence limit (also called a per-claim limit in some policy forms) sets the maximum the insurer will pay for any single covered incident, regardless of how many claimants are involved or how large the total damages. An aggregate limit sets the maximum the insurer will pay across all covered claims during the policy period, typically 12 months.

The Insurance Services Office (ISO), which publishes the standardized policy forms used as the basis for most commercial general liability (CGL) policies in the United States, codifies these definitions in its CGL form CG 00 01. Under the ISO CGL structure, the declarations page lists at least 4 distinct sub-limits that count against the general aggregate:

General Aggregate Limit — maximum for all covered losses during the policy period (excluding products/completed operations)
Products-Completed Operations Aggregate Limit — separate aggregate applying only to bodily injury or property damage arising from products or completed work (see completed operations liability coverage)
Personal and Advertising Injury Limit — per-person or per-organization cap for offenses such as libel or copyright infringement
Each Occurrence Limit — the per-incident cap applying to bodily injury and property damage claims

Medical payments and damage to premises rented to the insured carry their own sub-limits under the same form.

State insurance departments, which operate under authority granted by individual state insurance codes, regulate the minimum limits required for specific policy types. The National Association of Insurance Commissioners (NAIC) publishes model regulations and data on state-by-state minimum requirements, though commercial policy limits typically far exceed statutory minimums.

How it works

When a claim is filed, the insurer applies limits in a specific sequence. The per-occurrence limit is the first ceiling evaluated: if a single incident generates amounts that vary by jurisdiction in covered damages against a policy with a amounts that vary by jurisdiction per-occurrence limit, the insurer pays up to amounts that vary by jurisdiction for that event. The remaining amounts that vary by jurisdiction of per-occurrence capacity does not roll forward to future claims.

The aggregate limit then functions as a running balance. Each paid claim, defense cost (where the policy is defense-inside-the-limits), or settlement reduces the aggregate. Using the same example, after the amounts that vary by jurisdiction payment on a policy with a amounts that vary by jurisdiction general aggregate, only amounts that vary by jurisdiction remains available for subsequent claims in that policy year.

Defense costs and the aggregate: A critical structural distinction governs whether defense costs erode the policy limits. Policies structured as defense-inside-the-limits (also called "wasting" policies) count attorney fees, expert witness costs, and litigation expenses against the aggregate. Policies structured with defense-outside-the-limits do not. This distinction has significant practical consequence — a protracted lawsuit with amounts that vary by jurisdiction in defense costs reduces a amounts that vary by jurisdiction aggregate to amounts that vary by jurisdiction before any indemnity payment is made under a wasting policy. The duty-to-defend vs. duty-to-indemnify distinction is relevant here, as policies that carry a broad duty to defend are more likely to erode limits through defense spending.

Occurrence vs. claims-made trigger: The policy trigger type affects when limits apply. Under an occurrence policy, the limits in force on the date of the incident apply. Under a claims-made policy, the limits in force when the claim is reported govern. The structural differences between these trigger types are examined in detail at occurrence vs. claims-made policies.

Common scenarios

Construction contractor with a amounts that vary by jurisdictionM/amounts that vary by jurisdictionM policy: A general contractor carries a amounts that vary by jurisdiction per-occurrence / amounts that vary by jurisdiction aggregate CGL policy. Three separate job-site incidents occur in one policy year — each generating amounts that vary by jurisdiction in covered damages. The policy pays amounts that vary by jurisdiction on the first claim and amounts that vary by jurisdiction on the second, exhausting amounts that vary by jurisdiction of the amounts that vary by jurisdiction aggregate. The third claim has amounts that vary by jurisdiction in available aggregate but only amounts that vary by jurisdiction in damages, so the insurer pays amounts that vary by jurisdiction. Total paid: amounts that vary by jurisdiction. For insight into how contractors' policies are typically structured, see contractors liability insurance.

Healthcare provider with a products-completed operations claim: A medical device manufacturer's policy includes separate aggregate limits — amounts that vary by jurisdiction general aggregate and amounts that vary by jurisdiction products-completed operations aggregate. A products liability claim does not reduce the general aggregate at all; it draws from the separate products aggregate. This separation is a protective feature of the ISO CGL form that prevents product claims from stranding other coverage.

Restaurant with a liquor liability endorsement: A restaurant carries a amounts that vary by jurisdiction per-occurrence limit with a amounts that vary by jurisdiction aggregate. An alcohol-related incident triggers both general liability and liquor liability insurance considerations. Depending on how the policy is endorsed, the liquor liability sublimit may be equal to, or lower than, the per-occurrence limit on the base policy.

Decision boundaries

Selecting appropriate policy limits involves evaluating at least 5 discrete factors:

Contractual requirements — Lease agreements, vendor contracts, and government contracts frequently specify minimum per-occurrence and aggregate limits. Liability insurance for government contractors often mandates limits of amounts that vary by jurisdiction per occurrence at minimum, with some federal contracts requiring amounts that vary by jurisdiction or higher.
Industry risk profile — The NAIC and industry-specific regulators publish loss data by classification code. High-frequency, low-severity industries (retail, hospitality) face aggregate exhaustion risk differently than low-frequency, high-severity industries (construction, healthcare).
Net worth and asset exposure — The per-occurrence limit should, at a minimum, cover the value of assets that could be reached through a judgment. Courts do not cap damages at policy limits; a verdict exceeding policy limits creates personal or corporate liability for the difference.
Claims-made tail exposure — On claims-made policies, expiring or switching policies creates a coverage gap unless tail coverage (extended reporting period) is purchased. The tail period must align with the statute of limitations applicable to the underlying risk.
Stacking with excess layers — When per-occurrence limits are insufficient, excess or umbrella policies sit above the primary policy and respond after the primary limits are exhausted. The interaction between primary aggregate exhaustion and umbrella attachment points requires careful review; see liability insurance deductibles and retentions for how retained risk interacts with these structures.

Per-occurrence vs. aggregate: which limit matters more? For businesses with high claim frequency, aggregate exhaustion poses the greater risk. For businesses with low claim frequency but potential for catastrophic single events — such as a medical malpractice liability insurance exposure — the per-occurrence limit is the more critical figure. A policy with a amounts that vary by jurisdiction aggregate but a amounts that vary by jurisdiction per-occurrence limit provides inadequate single-event protection regardless of how much aggregate remains.

The NAIC's Annual Statement data and the Insurance Information Institute publish loss cost benchmarks by industry that inform appropriate limit selection. The ISO's loss costs (filed with state departments of insurance) also provide actuarial grounding for limit adequacy analysis at the class-code level.

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