Structured & Insurance-Linked

How to Underwrite an Industry Loss Warranty

Underwrite an industry loss warranty by modeling the probability that total industry losses for a covered peril and region exceed the trigger. Evaluate the trigger level, reporting agency, covered perils and territory, and term. Price by comparing rate on line with modeled expected loss and probability of attachment.

What makes industry loss warranty underwriting different

An industry loss warranty is a reinsurance or derivative contract that pays a fixed limit if total insured industry losses from a covered event exceed a specified threshold, such as a large US hurricane loss. Many ILWs also include an indemnity trigger requiring the buyer to have its own loss, often at a low level. What makes ILWs distinct is their simplicity: payout depends on an industry loss estimate from a reporting agency rather than the buyer's book. Value for writers comes from premium earned on remote events. Risk comes from frequency and severity of large catastrophes and from how industry loss estimates develop after an event.

Writers, such as reinsurers and ILS funds, focus on modeled probability of the industry loss being exceeded, correlation with other positions and pricing relative to expected loss. Buyers, often insurers or reinsurers, use ILWs as quick, transparent protection but accept basis risk because their own losses may not track industry losses. Because ILW contracts are often binary, writers assess full limit loss scenarios. Some ILWs are written as derivatives, which affects legal and regulatory treatment. Writers also note that ILW pricing tends to move sharply after large events, when buyers seek fast capacity.

Key metrics

How to underwrite it, step by step

1. Define the covered peril, territory, trigger level, limit and term.
2. Model the probability that industry losses exceed the trigger using catastrophe models.
3. Review the reporting agency and loss development provisions.
4. Assess correlation with the writer's existing portfolio.
5. Price the contract by comparing rate on line with modeled probability and market quotes.
6. Agree on collateral or credit support arrangements.
7. Track industry loss estimates after events and manage claims.

Due diligence checklist

• ILW contract or derivative confirmation
• Catastrophe model outputs for industry losses
• Reporting agency definitions
• Indemnity trigger terms if any
• Collateral or credit support agreement
• Counterparty credit information
• Portfolio exposure reports
• Historical industry loss data
• Loss development and dispute provisions
• Broker submissions

Key risks and mitigants

Typical financing and deal structure

ILWs are written as reinsurance contracts or as derivatives such as swaps. They usually cover a single year or season and pay a fixed limit if industry losses exceed the trigger. Some have dual triggers that also require a minimum indemnity loss to the buyer. Writers may be fully collateralized ILS funds or rated reinsurers. Contracts specify the reporting agency, loss development period and event definitions. Some are binary, while others pay proportionally between attachment and exhaustion. The hours clause, which defines how long a single event lasts for aggregation purposes, can decide whether two storms or a storm and its aftermath count as one loss. Collateralized writers post the full limit in trust for the term.

Red flags

• Unclear reporting agency or event definitions
• Rate on line close to modeled probability of attachment
• Heavy exposure to the same peril and region already in the portfolio
• Counterparty without collateral or strong rating
• Short loss development period that could force early settlement disputes

Frequently asked questions

Related terms

Educational content, not investment, credit, legal or tax advice. Benchmarks are common practitioner rules of thumb and vary by lender, market and cycle.