Aggregate limits in a commercial general liability policy cap the total dollars your insurer will pay across all covered claims during a single policy term, no matter how many separate incidents occur. A typical small-business CGL pairs a $1 million per-occurrence limit with a $2 million general aggregate, and once the aggregate is spent, the insurer stops paying claims and stops defending you for the rest of the year. The policy actually contains two independent aggregate pools covering different kinds of risk, and understanding how each one drains is the difference between confident risk management and a mid-year gap in coverage.
The Two Aggregate Pools in a CGL Policy
A standard CGL splits its coverage into two separate reservoirs that operate independently of each other. Exhausting one does not touch the other.
The general aggregate is the most the insurer will pay during the policy period for the broadest category of claims: bodily injury and property damage arising from your premises or operations, personal and advertising injury such as defamation or copyright infringement in your ads, and voluntary medical payments for minor injuries on your property.1International Risk Management Institute. How the Limits Apply in the CGL Policy A customer who slips on a wet floor, a competitor who sues over misleading advertising, and a visitor’s ambulance bill after tripping on your stairs all draw from this pool.
The products-completed operations aggregate covers only bodily injury and property damage tied to your products after they leave your hands or work you have finished. If you are an electrical contractor and a fire breaks out months after you completed a wiring job, that claim hits this second pool. Separating product and completed-work claims prevents a major recall or construction defect from wiping out coverage meant for everyday operations.1International Risk Management Institute. How the Limits Apply in the CGL Policy
How Per-Occurrence Limits Drain the Aggregate
Each aggregate pool is paired with a per-occurrence limit, which caps what the insurer will pay for any single event no matter how many people are hurt or how much property is destroyed.2International Risk Management Institute. Per Occurrence Limit Every dollar the insurer pays on a covered claim reduces the applicable aggregate by exactly that amount.
Here is how that plays out. Say your policy has a $1 million per-occurrence limit and a $2 million general aggregate. A fire at your warehouse injures several visitors and causes $1.2 million in total damages. Your insurer pays $1 million (the per-occurrence cap), and you are personally responsible for the remaining $200,000. That $1 million payment leaves $1 million in your general aggregate for the rest of the year. If a second, unrelated accident later causes $1.5 million in damages, the insurer again pays the $1 million per-occurrence limit, and your general aggregate is now at zero. Any further claim that year comes entirely out of your pocket.
Two moderate claims can exhaust an aggregate just as effectively as one catastrophic one. Businesses with heavy customer foot traffic or multiple active job sites tend to burn through aggregates faster than they expect.
Do Defense Costs Eat Into the Aggregate?
One of the most consequential details in any CGL policy is whether legal defense costs count against the aggregate. Under the standard ISO CG 00 01 form used by most insurers, defense costs are classified as supplementary payments and do not reduce the policy limits.3New York Office of General Services. Commercial General Liability Coverage Form CG 00 01 Your insurer could spend $500,000 defending a lawsuit on your behalf without touching your $2 million aggregate. Only the final settlement or judgment reduces the pool.
Some policies, particularly in professional liability and certain specialty lines, use what the industry calls “eroding limits” or “burning limits.” Under those terms, every dollar spent on attorneys and expert witnesses chips away at the aggregate.4International Risk Management Institute. Supplementary Payments A business with a $1 million aggregate that racks up $300,000 in defense costs has only $700,000 left to actually pay a claim. If the litigation drags on, you can end up with no money left to pay the claimant even if you lose. Check whether your specific policy treats defense costs as supplementary payments or as part of the limit before you need to know the answer.
What Happens When the Aggregate Runs Out
Exhausting an aggregate limit has consequences that go beyond losing indemnity dollars. Under the standard ISO form, the insurer’s duty to defend you ends the moment the applicable aggregate has been used up paying judgments, settlements, or medical expenses.3New York Office of General Services. Commercial General Liability Coverage Form CG 00 01 No more coverage for damages, no more insurer-paid attorneys. Any new lawsuit filed against you for the remainder of the policy period lands entirely on your business, including the cost of hiring your own defense counsel.
A company that settles two significant premises liability claims by June can spend the next six months fully exposed, with no CGL coverage at all, until the policy renews. The gap is real and immediate.
Umbrella and Excess Coverage
A commercial umbrella or excess liability policy is the standard hedge against aggregate exhaustion. When the primary CGL aggregate is fully depleted, a properly structured umbrella drops down and responds to claims the primary policy would have covered, subject to the umbrella’s own limits.5International Risk Management Institute. Commercial Umbrella Policy – A Few Things To Consider Without an umbrella, there is no backstop.
One wrinkle worth watching: the umbrella insurer may not recognize every type of payment under the primary CGL as a reduction of the aggregate. If your CGL insurer pays a sublimit claim and the umbrella does not count that payment as aggregate erosion, a gap can form between what your CGL has actually paid out and what the umbrella recognizes as the remaining primary limit.5International Risk Management Institute. Commercial Umbrella Policy – A Few Things To Consider That gap sits on the business. When shopping for umbrella coverage, confirm that the umbrella carrier recognizes reduction or exhaustion of the underlying insurance by any claim the primary insurer covers.
Reinstatement Endorsements
Some insurers offer endorsements that can restore a depleted aggregate before the policy term ends. These include automatic reinstatement provisions that restore the aggregate once during the term, optional reinstatement for an additional premium after depletion, and mid-term limit increases after underwriting review. Not every carrier offers these, and they are not part of the standard ISO form. Ask your broker about reinstatement endorsements when you bind the policy, not after a large claim has already cut your available coverage in half.
Annual Reset, No Rollover
CGL aggregate limits apply separately to each consecutive twelve-month policy period.1International Risk Management Institute. How the Limits Apply in the CGL Policy At renewal, the aggregate resets to its full original amount. Unused coverage does not roll over. A business that uses only $100,000 of a $2 million aggregate does not start the next year with $3.9 million. It starts with $2 million again.
The flip side matters just as much. A business that exhausts its aggregate in March sits unprotected for nine months unless it has umbrella coverage or secures a reinstatement. Monitoring your remaining aggregate throughout the year is not optional. Your broker or insurer can provide an aggregate status report showing how much coverage remains, and reviewing it at least quarterly keeps you from discovering the problem after a new claim is filed.
Per-Project and Per-Location Endorsements
A single shared aggregate creates a concentration problem for businesses operating across multiple sites. One large claim at any location can drain the coverage needed everywhere else. Two ISO endorsements address this by giving each designated site or project its own independent aggregate:
- CG 25 03 (Designated Construction Project) applies the general aggregate separately to each listed construction project. A developer building three apartment complexes gets a full aggregate at each site, so a major claim at one project does not leave the others uncovered.6International Risk Management Institute. Designated Construction Project General Aggregate Limit Endorsement
- CG 25 04 (Designated Location) applies the same concept to fixed locations. A property management company with ten shopping centers gets ten independent aggregate limits rather than one shared pool.1International Risk Management Institute. How the Limits Apply in the CGL Policy
These endorsements do not raise the per-occurrence limit. They replicate the general aggregate for each listed site. For contractors and multi-location operators, the added premium is usually modest relative to the protection gained.
Contractual Aggregate Requirements
Your CGL limits are not only about protecting your own balance sheet. Landlords, general contractors, and project owners routinely dictate the minimum coverage you must carry as a condition of signing a lease or being awarded a subcontract. The most common contractual minimum mirrors the standard small-business policy: $1 million per occurrence, $2 million general aggregate, and $1 million products-completed operations aggregate. Larger commercial landlords and institutional project owners frequently require higher limits, and many specify that the tenant or subcontractor must be added as an additional insured.
Failing to maintain the required aggregate can put you in breach of your lease or subcontract even if no claim has been filed. If a large settlement mid-year drops your remaining aggregate below the contractual floor, the landlord or general contractor may demand that you restore coverage immediately. Having an umbrella policy or a reinstatement endorsement already in place is far cheaper than scrambling to solve the problem after notice of breach.
Choosing the Right Aggregate Limit
Most small businesses start with the $1 million per-occurrence and $2 million general aggregate structure because it satisfies common contractual requirements and keeps premiums manageable. Common does not mean adequate. A retailer with heavy foot traffic, a contractor running multiple active job sites, or a manufacturer with widely distributed products faces a very different risk profile than a solo consultant working from home.
When evaluating whether your aggregate is high enough, look at three things: the contractual minimums imposed by your landlords and customers, the realistic frequency and severity of claims in your industry, and whether you have umbrella coverage above the primary limits. Doubling the general aggregate from $2 million to $4 million typically adds between 15 and 45 percent to the premium, depending on industry and claims history. For businesses where a single bad year could produce two or three six-figure claims, that additional premium is some of the cheapest protection available.