Non-Proportional CoversApplied

Clash Cover

When one event touches many policies at once

Excess-of-loss protection for the accumulation that happens when a single event or claimant triggers several policies simultaneously.

Open the interactive version → definition, quiz, structure diagram and progress tracking

Definition

A clash cover is excess-of-loss reinsurance that responds when a single event, or a single claimant, produces losses on two or more policies — or two or more insureds — at once, pushing their combined net retained loss above an aggregate attachment that no single policy's own retention was ever meant to absorb. It typically sits across an entire casualty account rather than any one line of business, and is priced and bought separately from per-risk or per-occurrence covers on the individual lines.

The defining feature is multiple policies, one cause: a single manufacturing defect that triggers product liability, general liability and directors and officers claims against the same insured all at once is a textbook clash.
Clash cover exists because per-policy retentions are sized for a single policy responding alone; nobody sizes a $500,000 GL retention expecting three other lines to hit the same retention in the same week from the same event.
It is a relatively thin layer written for a low-frequency, high-severity accumulation risk — most years it does nothing, and that is exactly what it is meant to do.

Worked example

A single aviation accident triggers claims under an airline's liability policy, its airport operator's liability policy, and a ground-handling contractor's policy — all with the same cedent. Individually each retention absorbs its own share; a clash cover responds to what all three retained losses add up to together.

Scenario · figures in USD

One collapse, three policies, one clash layer

A construction-site crane collapse injures workers from three separate contractors, each insured by the same carrier under separate liability policies with $1M retentions apiece. The carrier holds a $15M xs $3M clash cover across its whole casualty account, responding to the combined net retained loss from a single event across multiple policies.

Policy A retained loss	$1.0M
Policy B retained loss	$1.0M
Policy C retained loss	$2.5M
Combined retained loss from the one event	$4.5M
Clash layer	$15M xs $3M
Clash recovery ($4.5M − $3M)	$1.5M
Without the clash cover	Each policy retention stood alone — no single one reached $3M

So whatNo individual policy came close to a $3M retention on its own. It was only by treating the three as one event with one combined retained loss that the accumulation became visible — and recoverable.

Check your understanding

What is the defining feature of a loss that a clash cover is designed to catch?

A single event or claimant producing losses on two or more policies at once. Clash is specifically about accumulation across multiple policies from one cause — not size, frequency or natural catastrophe on their own.

Why can a clash event breach a retention that no individual policy's own retention was ever close to?

Combining several policies' retained losses from the same event reaches a level none of them would alone. The clash attachment applies to the sum of the retained losses across every affected policy, which is exactly why several modest retentions can add up to a recoverable amount.

Word problem

A products-liability event triggers claims against the same cedent under four separate policies, with retained losses of $800,000, $650,000, $1.2M and $900,000. The cedent holds a $25M xs $2.5M clash cover across the account. Calculate the combined retained loss and the clash recovery.

Show a hint

Add all four retained losses together first — that combined figure is what the clash attachment point applies to, not any single policy's figure.

Reveal the worked answer

Combined retained loss = $800,000 + $650,000 + $1.2M + $900,000 = $3.55M
Clash layer attaches at $2.5M
Clash recovery = $3.55M − $2.5M = $1.05M (well within the $25M limit)

The four policies combine to a $3.55M retained loss, and the clash layer recovers $1.05M of it. Not one of the four policies individually came within $1.7M of the $2.5M attachment — the clash cover exists precisely to see the accumulation the individual retentions cannot.