15.2 Commercial Umbrella and Excess Liability

Umbrella vs. Excess: The Core Distinction

Both a commercial umbrella and a true excess policy provide liability limits above an insured's primary coverage, but they behave differently when a gap appears.

• A true (following-form) excess policy only raises the limit. It adopts the underlying policy's terms word-for-word: if the primary excludes it, the excess excludes it too. It never drops down to fill a coverage hole.
• A commercial umbrella does three things: (1) provides excess limits over scheduled underlying policies, (2) drops down to act as primary for some claims the underlying excludes (subject to a Self-Insured Retention), and (3) replaces an exhausted underlying aggregate.

Quick Answer: Excess = more of the same coverage. Umbrella = more coverage AND broader coverage with a drop-down feature.

There are two flavors of excess to keep straight. A following-form excess literally incorporates the underlying wording by reference. A stand-alone (self-contained) excess has its own terms that may be narrower than the underlying, creating gaps. Neither broadens coverage the way an umbrella's drop-down does; both simply stack additional limit on top of the primary tower.

The Layered Structure and the SIR

Umbrellas sit on top of scheduled underlying policies, most commonly:

For a covered claim the underlying also covers, the umbrella pays only after the underlying limit is exhausted. For a claim the underlying excludes but the umbrella covers, there is no underlying limit to burn through, so the insured first pays the Self-Insured Retention (SIR) - often $10,000 or $25,000 - and the umbrella drops down above the SIR.

The SIR is not the same as a deductible reimbursed to the insurer; it is a true retention the insured satisfies before the umbrella responds.

Umbrellas may exhaust vertically (one tower of limits burns top-to-bottom on a single occurrence) or, when multiple primaries are involved, the insurer applies the umbrella above whichever underlying applies. The umbrella's own aggregate typically applies to drop-down claims, while excess-over-underlying losses pass through the underlying aggregate first. Expect questions distinguishing the per-occurrence umbrella limit from its annual aggregate.

Worked Vertical-Exhaustion Example

An insured carries $1M CGL (per occurrence) and a $5M commercial umbrella with a $10,000 SIR. A single covered bodily-injury judgment totals $4,300,000.

• The claim is covered by the underlying CGL, so the SIR does not apply (SIR only applies to drop-down on uncovered claims).
• CGL pays its $1,000,000 per-occurrence limit.
• The umbrella pays the excess: $4,300,000 - $1,000,000 = $3,300,000 (well within the $5M umbrella).
• Total paid = $4,300,000. Insured out of pocket = $0 (beyond any CGL deductible).

Now flip it: the same insured faces a $300,000 claim excluded by the CGL but covered by the umbrella. There is no underlying limit to exhaust, so the insured pays the $10,000 SIR and the umbrella pays $290,000.

Three Ways an Umbrella Responds

A true commercial umbrella does three things: (1) pays excess over scheduled underlying limits (CGL, auto, employers liability) once they exhaust; (2) drops down to act as primary when an underlying aggregate is exhausted; and (3) provides broader coverage than the underlying for some claims, subject to a self-insured retention (SIR) the insured pays first. A plain excess policy, by contrast, only follows form over the underlying and does not drop down or broaden.

The SIR vs. Deductible Distinction

The SIR applies only to claims the umbrella covers but the underlying does not; the insured pays the SIR before the umbrella responds. This differs from a deductible, which the insurer advances and then collects back. Maintaining the scheduled underlying limits is a warranty: if the insured lets underlying coverage lapse, the umbrella treats the missing limit as if it were still in place, leaving the insured to fund the gap.

Worked Drop-Down Example

The CGL pays its $1,000,000; the umbrella pays the remaining $3,000,000. If a second $1,000,000 claim has already exhausted the CGL general aggregate, the umbrella drops down and pays from dollar one (subject to the SIR) on the next covered claim, acting as primary. This vertical-exhaustion mechanic, plus the underlying-limits warranty, is the most-tested umbrella content.

Maintenance Warranty and Common Exclusions

Every umbrella contains a maintenance of underlying insurance condition. If the insured lets a required underlying policy lapse or buys a lower limit than scheduled, the umbrella treats the required limit as if it were still in place - the insured eats the difference. Example: the umbrella requires $1M CGL but the insured renews at $500,000. On a $1.2M covered loss, the underlying pays $500,000, but the umbrella starts paying only above $1,000,000 (the required amount), leaving the insured responsible for the $500,000 gap.

Frequently tested umbrella exclusions:

• Pollution (beyond narrow hostile-fire carve-backs)
• Professional liability / E&O (needs a separate policy - see 15.3)
• Prior known losses and claims before the policy inception
• Workers compensation statutory benefits (only employers liability is picked up)
• Owned/contractual aircraft and watercraft beyond stated parameters

Defense costs can be inside the limit (eroding it) or outside (in addition); umbrellas usually defend only when the underlying does not, then count those costs against the limit.

Finally, distinguish the per-occurrence retention from the SIR. On covered claims the umbrella never charges the SIR because the underlying limit serves as the attachment point; the SIR is reserved strictly for drop-down (uncovered-by-underlying) losses. Examiners love the trap of applying the SIR to a normal excess claim - it does not apply there. Also remember an umbrella can provide broader territory and pick up some incidental contractual liability the primary sublimits, which is why brokers position it as more than just extra dollars.