Liability Limits, Sublimits, and Aggregates: What Each Number in Your Policy Controls

Why Policy Numbers Aren't Interchangeable

Most business owners look at their declarations page, see a large dollar figure next to "General Liability," and assume that's the ceiling on what their insurer will pay — for any claim, in any situation. That assumption is wrong, and it costs policyholders money every year.

A commercial liability policy contains not one limit, but a structure of limits — each governing a different dimension of coverage. The per-occurrence limit caps a single event. The aggregate limit caps the policy year. Sublimits cap specific claim types within the broader policy. All three can apply simultaneously to a single loss, and when they do, the smallest one governs.

This reference breaks down what each number controls, how they interact, and where policyholders most commonly get surprised. For a broader orientation to how limits function across coverage types, see Policy Limits Explained.

Per-Occurrence Limits: The Single-Event Cap

The per-occurrence limit — sometimes called the per-claim limit in claims-made policies — is the maximum your insurer will pay arising from any one incident, regardless of how many people are injured or how many properties are damaged in that event.

Example: A contractor's employee causes a gas explosion at a job site. Three adjacent units are damaged and two people are hospitalized. If the policy carries a $1,000,000 per-occurrence limit, the total paid for all bodily injury, property damage, legal defense, and settlements arising from that explosion cannot exceed $1,000,000 — even if actual damages are $2,400,000.

What Counts as One Occurrence?

This is where disputes arise. Insurers and policyholders frequently disagree about whether multiple claims stem from one occurrence or several. A series of slip-and-fall incidents on a defective floor might be argued as one ongoing occurrence (the defective floor) or multiple separate ones (each individual fall). Courts have applied both the cause test and the effect test to resolve these disputes. Your policy's definition of "occurrence" — read it — determines which standard applies.

For auto liability policies, the per-occurrence structure works differently: it often splits into per-person and per-accident sub-buckets. See how split liability limits work for the mechanics of those numbers.

Aggregate Limits: The Policy-Year Ceiling

The general aggregate limit is the total the insurer will pay across all covered claims during the policy period — typically 12 months. Once that pool is exhausted, the policy pays nothing further for the remainder of the year, even if a new, independent incident occurs.

Standard ISO commercial general liability (CGL) forms include multiple aggregate buckets:

• General Aggregate: Applies to most claims — bodily injury, property damage, personal injury, advertising injury.
• Products-Completed Operations Aggregate: A separate aggregate that applies specifically to claims arising from your products or completed work. This is distinct from the general aggregate, meaning your product liability claims draw from a different pool.
• Each Occurrence Limit: Feeds into the general aggregate; each occurrence draws against both the per-occurrence limit and the remaining aggregate.

A common ratio is $1M per occurrence / $2M aggregate. That means after two large claims each hitting the per-occurrence limit, the aggregate is exhausted — and a third claim pays zero. Businesses with high claim frequency need to monitor aggregate erosion actively during the policy year.

For a detailed comparison of how these two limits interact specifically in general liability policies, per-occurrence vs. aggregate explained is the right next read.

Sublimits: The Caps Nobody Warns You About

A sublimit is a lower cap that applies to a specific category of loss within a broader coverage limit. It does not add to your coverage — it restricts it. If your policy carries a $2,000,000 general aggregate but a $100,000 sublimit on mold remediation, a $400,000 mold claim pays $100,000. The remaining $300,000 comes out of your pocket.

Sublimits appear across virtually every commercial line. Common examples include:

The critical mistake: many policyholders conflate sublimits with exclusions. An exclusion eliminates coverage entirely. A sublimit preserves coverage but caps it at a lower number. Both require careful review at renewal, but they demand different responses — a sublimit can often be bought up; an excluded peril requires a separate policy.

The broader dynamics of how sublimits nest inside overall coverage structures are explained in detail at Sub-Limits Inside Your Policy.

How All Three Interact on a Single Claim

When a claim is filed, all three limit types activate simultaneously. The sequence generally works as follows:

1. The claim is reviewed for coverage (does the policy language apply?).
2. If a sublimit applies to this claim type, the sublimit governs the maximum payment for that category.
3. The sublimit payment draws against the per-occurrence limit. The insurer will not pay more for this event than the per-occurrence limit, even if multiple sublimits are triggered.
4. Whatever is paid erodes the aggregate. Once the aggregate is zero, all coverage for the policy year stops.

Practical illustration: A restaurant chain files two claims in one policy year. The first is a slip-and-fall ($750,000 judgment) against a $1,000,000 per-occurrence / $2,000,000 aggregate policy — paid in full, aggregate now at $1,250,000 remaining. The second claim involves a spoiled food outbreak with $600,000 in damages, but a $250,000 food contamination sublimit applies — insurer pays $250,000, leaving the business liable for $350,000 out of pocket. Aggregate now at $1,000,000 remaining.

That $350,000 gap isn't a bad-faith claim or an oversight — it's a sublimit doing exactly what it was written to do. Business owners who haven't read those numbers before the claim have no recourse after it.

Policy Limits & Exclusions covers the full spectrum of how caps and exclusions work together to define what a policy actually pays.

Practical Steps for Reviewing Your Limits Structure

Reviewing your policy limits isn't a once-at-purchase task. Exposure profiles change — revenue grows, operations expand, new products launch — and the limits that were adequate three years ago may be structurally inadequate today.

At Every Renewal, Verify These Items

• Per-occurrence limit vs. your largest realistic single-event loss: Model your worst credible scenario. A product recall, a serious contractor injury, a data breach. Does the per-occurrence limit cover it?
• Aggregate adequacy for claim frequency: High-frequency operations (hospitality, construction, healthcare) erode aggregates faster. Consider per-project or per-location aggregate endorsements if your standard aggregate is at risk of exhaustion.
• All sublimits — one by one: Request a full schedule of sublimits from your broker in writing. Don't rely on verbal assurances. For each sublimit, assess whether you can buy it up to the full policy limit or whether a standalone policy addresses it better.
• Products-completed operations aggregate separately: If you manufacture or install anything, this aggregate is as important as the general aggregate. Verify it has not been reduced by endorsement.

When to Consider Umbrella or Excess Coverage

Umbrella policies sit above your primary limits and activate when the underlying policy is exhausted. They are not a substitute for appropriate primary limits — most umbrellas require the underlying policy to be maintained at specified minimums. If your primary general liability aggregate erodes mid-year, your umbrella does not drop down to fill it unless specifically endorsed to do so.

For a side-by-side look at how limits are structured across different policy types — auto, commercial property, professional liability — Policy Limits Across Insurance Types provides the comparative reference. And if you work with auto liability specifically, Split Limits vs. Combined Single Limit explains the structural difference between split and CSL formats.

For full definitions of the terms used throughout this article — from aggregate erosion to occurrence triggers — A Glossary of Policy Limit and Exclusion Terms is the reference to bookmark.