15.2 Commercial Umbrella and Excess Liability

Commercial Umbrella and Excess Liability

A commercial umbrella sits above primary liability policies, providing three distinct functions that the exam tests relentlessly. First, it provides additional limits over scheduled underlying policies (CGL, commercial auto, employers liability). Second, it drops down to act as primary coverage for claims the underlying excludes, subject to a self-insured retention. Third, it can replace primary limits once they are exhausted by other claims. An excess liability policy, by contrast, only adds limits over the same underlying coverage; it does not drop down or broaden.

Three Triggers, Three Behaviors

The self-insured retention (SIR) is the umbrella's deductible for drop-down claims. A typical SIR is $10,000. When the umbrella drops down because no underlying applies, the insured pays the SIR first, then the umbrella pays.

Required Underlying Limits and the Coverage Gap Trap

Umbrella policies require scheduled underlying limits the insured must maintain, for example CGL at $1,000,000 each occurrence / $2,000,000 aggregate and auto at $1,000,000 CSL. If the insured fails to maintain those limits, the umbrella treats coverage as if the required limits were in place and the insured absorbs the difference. The exam loves this: a lapse in the underlying does not shift that gap onto the umbrella.

Worked Stacking Example

An insured carries CGL at $1,000,000 each occurrence and a commercial umbrella with a $5,000,000 limit. A covered liability judgment is $4,000,000.

• Primary CGL pays its limit: $1,000,000
• Umbrella pays the excess: $4,000,000 - $1,000,000 = $3,000,000
• Remaining umbrella limit available: $5,000,000 - $3,000,000 = $2,000,000

Now suppose a second, different occurrence excluded by the CGL (a covered umbrella-only exposure) produces a $600,000 loss with a $10,000 SIR.

• Insured pays SIR: $10,000
• Umbrella drops down and pays: $600,000 - $10,000 = $590,000

Common Exclusions and Maintenance Conditions

Umbrellas commonly exclude workers compensation, ERISA/employee-benefit claims, owned-aircraft and watercraft beyond stated sizes, professional liability, and pollution (unless endorsed). The insured must keep underlying coverage in force as a policy condition; failure to do so is the single most-tested gap scenario on the national portion.

Concurrency and 'Follow Form' Distinctions

Umbrellas are written non-concurrent with the underlying: the umbrella has its own broader insuring agreement and can cover something the CGL does not, which is the drop-down feature. A pure excess policy is usually follow form, adopting the exact terms, conditions, and exclusions of the underlying CGL and merely adding limits. If the CGL excludes a peril, a follow-form excess also excludes it; an umbrella might pick it up subject to the SIR.

Aggregate Drop-Down on Exhaustion

Umbrellas can restore coverage when the underlying aggregate is used up by unrelated claims. Suppose the CGL general aggregate of $2,000,000 is exhausted mid-year. A new covered occurrence would normally have no primary limit left, so the umbrella drops down to replace the exhausted aggregate and becomes primary, subject only to any stated SIR. This exhaustion drop-down is distinct from the excluded-claim drop-down and is a favorite exam distractor.

Defense Costs and Pricing

When the umbrella drops down because no underlying applies, it provides defense in addition to its limit (occurrence-based umbrella defense is usually supplementary, not eroding). When it pays mere excess over an exhausted underlying, the primary insurer's defense duty may already be consumed. Umbrella rating considers the underlying schedule, industry hazard class, loss history, revenue or payroll, fleet size, and unusual exposures; higher limits cost progressively less per million because catastrophe layers are statistically less likely to be reached.

Drop-Down, SIR, and the Three Ways an Umbrella Responds

A commercial umbrella performs three distinct functions the exam isolates. First, it provides excess limits over scheduled underlying policies (CGL, commercial auto, employers liability) once those limits are exhausted — pure additional capacity. Second, it provides broader coverage for claims the underlying policy does not cover at all; here the insured pays a self-insured retention (SIR) — commonly $10,000 — before the umbrella responds, and the umbrella "drops down" to act as primary. Third, it drops down to replace exhausted underlying aggregate limits.

The danger is the coverage gap: if the insured fails to maintain the required underlying limits, the umbrella treats the underlying as if it were in place and pays only the excess, leaving the insured to absorb the shortfall. "Follow form" excess simply mirrors the underlying terms, whereas a true umbrella is written non-concurrently with its own (sometimes broader, sometimes narrower) terms and exclusions — so an umbrella can be both broader (drop-down) and narrower (its own exclusions, e.g., professional liability) than what sits beneath it.

Maintenance-of-Underlying and Coverage-Gap Recap

The umbrella's value depends on the insured maintaining the required underlying limits stated in its schedule. If the insured lets a scheduled CGL or auto policy lapse or carries lower limits than required, the umbrella does not drop down to fill the missing primary layer — it pays only as if the required underlying were in force, leaving the insured to absorb the gap. The takeaway hierarchy: excess function adds limits above the underlying; drop-down function provides primary coverage (over an SIR) for claims the underlying never covered or replaces an exhausted aggregate.

Distinguishing a true umbrella (its own broader-and-narrower terms, written non-concurrently) from a follow-form excess (mirrors the underlying exactly) is the chapter's recurring exam contrast.