15.2 Commercial Umbrella and Excess Liability

Umbrella vs. Excess — The Core Distinction

Both a commercial umbrella and an excess liability policy sit above primary (underlying) coverage and add limits. The difference is breadth of coverage.

An umbrella can do two jobs: pay excess of the underlying limit, and pay first-dollar (above an SIR) for a covered loss the underlying excludes entirely. A pure excess follow-form policy only does the first job.

The Schedule of Underlying and Required Limits

A commercial umbrella conditions its coverage on the insured maintaining specified underlying limits listed in the Schedule of Underlying Insurance. Typical required underlying limits are:

• CGL: $1,000,000 per occurrence / $2,000,000 aggregate
• Business Auto: $1,000,000 combined single limit
• Employers Liability (WC Part Two): $500,000 / $500,000 / $500,000

If the insured carries less than required, or lets a scheduled policy lapse, the umbrella responds as though the required underlying were still in place. The insured — not the umbrella — absorbs the gap created by the shortfall.

Worked Example: Underinsured Underlying

An umbrella requires a $1,000,000 underlying CGL limit but the insured actually carries only $500,000. A covered $2,000,000 judgment is entered.

• The CGL pays its actual limit: $500,000
• The umbrella treats the required underlying as exhausted at $1,000,000, so it pays everything above $1,000,000: $1,000,000
• The gap between actual underlying ($500,000) and required underlying ($1,000,000) — that $500,000 — falls on the insured

Result: CGL $500,000 + insured $500,000 + umbrella $1,000,000 = $2,000,000. Trap: candidates assume the umbrella fills the underlying shortfall. It does not — failing to maintain scheduled underlying limits is the insured's exposure.

Drop-Down and the Self-Insured Retention

When a loss is covered by the umbrella but excluded by the underlying (a true coverage gap), the umbrella drops down and pays after the insured satisfies the Self-Insured Retention (SIR), often $10,000 or $25,000. The SIR functions like a deductible but applies only to drop-down claims, not to claims that pierce a working underlying limit.

Worked example: An insured's CGL excludes a particular personal-injury offense, but the commercial umbrella covers it. A $500,000 judgment is entered and the SIR is $10,000.

• Underlying pays: $0 (excluded)
• Insured pays the SIR: $10,000
• Umbrella drops down and pays: $490,000

Trap: an SIR is not the same as required underlying. The SIR applies to gaps; the underlying limit applies to shared exposures. Confusing the two is a frequent exam miss.

Aggregate Erosion and Stacking of Limits

A commercial umbrella adds a single limit that sits above the underlying. Because the underlying CGL carries its own aggregate, the umbrella must be analyzed across the policy year, not just one claim. Consider a CGL with a $2,000,000 general aggregate and a $5,000,000 umbrella. Two unrelated $1,500,000 claims and one $1,000,000 claim arrive in the same year:

• Claim 1: CGL pays $1,000,000 (per-occurrence) and umbrella pays $500,000
• Claim 2: CGL aggregate now has $1,000,000 left; it pays $1,000,000, umbrella pays $500,000
• Claim 3: CGL aggregate is exhausted; the umbrella drops down above any SIR and effectively becomes primary for the rest of the year

The lesson is that once the underlying aggregate is used up, the umbrella behaves like first-dollar coverage over the retention for subsequent claims, even though no single claim exceeded the per-occurrence limit. Trap: candidates assume the umbrella only responds when a single claim breaks the per-occurrence limit; in fact aggregate exhaustion is a second, separate trigger.

A further distinction: umbrellas are usually written for commercial insureds with multiple underlying lines (CGL, auto, employers liability), whereas a personal umbrella sits over homeowners and personal auto. They are not interchangeable, and writing the wrong form leaves operational exposures uninsured.

Drop-Down, the SIR, and Coverage Broader Than Underlying

A true umbrella can be broader than the underlying policies, so when it covers a loss the underlying does not, it drops down to pay after the insured satisfies a self-insured retention (SIR) — the umbrella's deductible for exposures not covered below. A pure excess policy simply sits above the underlying and follows its terms ("follow form"), providing no broader coverage and no drop-down.

The exam tests recognizing that an umbrella requires the insured to maintain stated underlying limits; if the insured lets underlying coverage lapse or carries less than required, the umbrella pays only as if the required underlying were in place, leaving a gap.

Aggregate Erosion and a Layered Worked Example

When an underlying aggregate is eroded by earlier claims, the umbrella may drop down to fill the resulting gap, depending on wording. Consider a CGL with a $1,000,000 each-occurrence limit and a $5,000,000 umbrella over it: a $3,500,000 judgment is paid $1,000,000 by the CGL and $2,500,000 by the umbrella. But if the CGL aggregate had already been exhausted by prior losses, the umbrella might drop down to pay the first dollar subject to the SIR. Understanding the schedule of underlying insurance, required limits, drop-down, and SIR is the core of every umbrella question.