Facultative vs Treaty Reinsurance: What’s the Difference?

Once you understand what reinsurance is, the next question that comes up is how it actually gets arranged. There are two main mechanisms, treaty and facultative, and the difference between them comes down to efficiency versus flexibility.

Treaty: reinsuring by the block

Most reinsurance is arranged through treaties. Rather than negotiating cover risk by risk, an insurer and reinsurer agree to reinsure an entire block of business under a single set of terms. For example, a treaty might cover all the property business an insurer writes in a given country.

Because the reinsurer is not reviewing each individual policy, this arrangement is effectively blind. The reinsurer does not know the specific properties or policyholders involved. To make that workable, the parties agree criteria upfront, limits on value, exclusions for particular types of risk, so the reinsurer has a reasonable sense of what it is automatically taking on without having to underwrite each case individually.

This is by far the most efficient way to reinsure. Thousands of policies can be attached to a single contract, with premium flowing through automatically. Reviewing every policy individually would be prohibitively slow and expensive for both sides.

“Reviewing every policy individually would be prohibitively slow and expensive for both sides.”

Simon CrummayHead of Business Analysis, Jean Edwards Consulting

Facultative: reinsuring the exception

Facultative reinsurance, often shortened to “FAC,” exists for the cases that fall outside a treaty’s agreed criteria. If an insurer wants to write a risk that exceeds the treaty’s value limit, or falls outside its defined parameters, a large or unusual building, for instance, it cannot simply fold that risk into the existing treaty.

Instead, the insurer takes that single risk directly to reinsurance underwriters and negotiates terms specifically for it. This lets the insurer accommodate a client or opportunity that would otherwise fall through the gaps of its standard arrangements.

Why treaty dominates, and where facultative earns its place

Facultative arrangements are more expensive to administer. Every case requires its own paperwork, negotiation and underwriting, effectively treating the reinsurer as if it were underwriting the original policy itself, compared to a treaty, where one agreement can cover thousands of policies with minimal ongoing administration.

That additional cost is the trade-off for flexibility. Facultative reinsurance exists specifically to handle the large, complex or non-standard risks that a treaty was never designed to absorb, allowing insurers to say yes to clients and opportunities they would otherwise have to turn away.

In short: treaty is the default, efficient and low-cost way to reinsure the bulk of a book of business. Facultative is the precision tool for the exceptions that do not fit the standard mould.