15.2 Commercial Umbrella and Excess Liability

Commercial Umbrella and Excess Liability

A commercial umbrella sits above scheduled underlying policies - typically the CGL, commercial auto, and employers liability (Coverage B of workers comp) - to provide three functions: (1) excess limits over the underlying, (2) drop-down coverage when underlying aggregates are exhausted, and (3) broader coverage for some claims the underlying excludes, subject to a self-insured retention. Unlike a personal umbrella, the commercial umbrella is heavily manuscripted; there is no single universal ISO form, though ISO's CU series provides a standard template.

The distinction tested most often is umbrella vs. excess liability:

Umbrella vs. Pure Excess

An excess (following-form) policy simply adds limits and adopts the underlying policy's terms, conditions, and exclusions verbatim. A true umbrella can cover claims the underlying excludes, but then the insured pays a self-insured retention (SIR) - often $10,000 to $25,000 - that functions like a deductible for those drop-down-only claims. The SIR does not apply when the umbrella is merely paying excess over a triggered underlying limit.

Large accounts often layer coverage: a $25,000,000 tower might be a $5,000,000 lead umbrella with three $5,000,000 following-form excess layers and a $5,000,000 high-excess layer stacked above. Each higher layer attaches only after the layer beneath it exhausts, and the lead umbrella's broadening features generally flow up the tower because the excess layers follow its form.

How Limits Stack - Worked Example

An insured carries a CGL with a $1,000,000 occurrence / $2,000,000 aggregate limit and a $5,000,000 commercial umbrella with a $10,000 SIR. Consider two losses:

• Covered by both: A $3,000,000 bodily-injury judgment. The CGL pays its $1,000,000 occurrence limit; the umbrella pays the next $2,000,000. No SIR applies because the underlying responded. Total paid = $3,000,000.
• Excluded by CGL, covered by umbrella: A $300,000 claim the CGL excludes. The umbrella drops down, the insured first pays the $10,000 SIR, and the umbrella pays the remaining $290,000.

Umbrella limits are usually a single combined limit per occurrence with an aggregate; they are not indexed to the underlying limit. A common exam error is assuming the umbrella's full $5M sits on top regardless - it only attaches once the scheduled underlying limit is exhausted.

Attachment, Maintenance, and Gaps

The umbrella requires the insured to maintain the scheduled underlying limits. If the insured lets the CGL aggregate drop or cancels it, the umbrella treats the underlying as if it were still in force - the insured self-insures the difference. Likewise, if an underlying limit is exhausted by earlier claims, a true umbrella drops down to act as primary for later claims.

• Underlying not maintained: insured bears the gap (umbrella does not fill it)
• Underlying exhausted by paid claims: umbrella drops down as primary
• Claim outside all underlying coverage: umbrella covers after SIR

The defense obligation also shifts: while the underlying owes defense, the umbrella usually does not; once the underlying limit exhausts, the umbrella picks up defense.

Required Underlying Limits and Common Exclusions

Umbrella underwriters publish a schedule of required minimum underlying limits the insured must carry before the umbrella will attach - typically CGL at $1,000,000 occurrence / $2,000,000 aggregate, commercial auto at $1,000,000 combined single limit, and employers liability at $500,000/$500,000/$500,000. Quoting an umbrella always starts by confirming these floors.

Even a broad umbrella carries its own exclusions, and the exam tests that an umbrella does not turn into all-risk coverage:

• Workers compensation benefits (statutory - covered by the WC policy, not the umbrella)
• Owned-aircraft and watercraft above stated sizes, unless scheduled
• Professional liability / E&O (needs a separate E&O policy)
• Liability assumed under certain contracts, pollution, and intentional acts

Because employers liability (WC Coverage B) is a permitted underlying, an over-limit employee bodily-injury suit can reach the umbrella, while the statutory WC benefits cannot - a distinction worth memorizing.

The Self-Insured Retention vs. a Deductible

A frequent exam point is the difference between an umbrella's self-insured retention (SIR) and an ordinary deductible:

Quick Answer: The SIR applies only when the umbrella drops down to cover a claim no underlying policy reaches; it does not apply when the umbrella simply pays excess over a triggered underlying limit.

Building and Pricing a Liability Tower

Underwriters and producers think of high-limit liability as a stacked tower. The lead (primary) umbrella attaches above the scheduled underlying limits and carries the broadest wording. Above it sit one or more following-form excess layers that adopt the lead umbrella's terms and simply add limit. Each layer attaches only after the layer beneath it is exhausted, so a $25,000,000 program might read: $5M lead umbrella, then three $5M excess layers, then a $5M high-excess layer.

Two rules drive tower questions. First, the insured must maintain every scheduled underlying limit; letting the CGL aggregate erode without notice means the insured self-insures the gap, because the umbrella treats the underlying as if still full. Second, the lead umbrella's broadening features generally flow up the tower because the excess layers follow its form. When a scenario asks how much each layer pays on a large judgment, work from the bottom up: exhaust the underlying, then the lead umbrella, then each excess layer in turn until the loss or the top of the tower is reached.