Promises With a Price: Underwriting Earn-Out Risk in UK MGA Transactions

In UK MGA transactions, deferred consideration is often the bridge between what a seller believes the business is worth and what a buyer is prepared to pay today. The earn-out is presented as a pricing mechanism: hit an agreed renewal retention rate, loss ratio or commission income target, and further consideration falls due. In the deal documents it looks like arithmetic. For an underwriter, it is something less tidy: a contingent promise whose performance depends on intangible evidence, governance and behaviour after completion.

That distinction matters. Earn-outs are not merely commercial terms to be noted in a transaction file. They create a specialty exposure that can be assessed, stressed and priced. The question for 2026 is whether buyers, sellers and their underwriters are treating post-deal performance risk with the same discipline as any other delegated authority or contingent liability.

Why an earn-out is an underwriting object

An earn-out is an agreement to pay for future performance that has not yet been evidenced. Its value rests on metrics that are often defined in accounting language but driven by underwriting and operational behaviour. Renewal retention depends on pricing, service and appetite. Loss ratios depend on reserving, claims handling and reinsurance recoveries. Commission income depends on bordereaux accuracy, profit commission mechanics and clawback provisions.

None of those measures sits still. A buyer may integrate the MGA into a new operating platform, change underwriting appetite, renegotiate capacity or alter claims procedures. A seller may remain in the business for a transition period, then leave. The earn-out metric may be contractually fixed, but the conditions that produce it are not. That gap between a defined target and an undefined operating environment is where underwriting attention belongs.

The metrics that carry the risk

Renewal retention is rarely as simple as the percentage suggests. Underwriters should ask which policies are in scope, how renewal is defined, whether mid-term adjustments count, and how the buyer's own growth or remediation activity affects the denominator. A seller can meet a retention target by discounting renewals, just as a buyer can miss it by deliberately re-underwriting a book. The wording must make clear which behaviour is permitted and which is not.

Loss ratio targets bring similar ambiguity. Accident-year and calendar-year measures produce different answers. Reserve strengthening after completion may fall into the earn-out period even though it relates to earlier underwriting. Large losses, catastrophe events and reinsurance recoveries can distort a single year. If the target is set on a gross or net basis, the treatment of reinsurance must be explicit.

Commission income is perhaps the most intangible of the common metrics. Gross commission, net commission, profit commission and contingent commission can be measured at different points and with different deductions. Clawback provisions may operate after the earn-out window has closed. A target based on commission income can therefore be met on one ledger and fail on another.

Wording gaps that become disputes

The most expensive earn-out disputes rarely begin with a collapsed business. They begin with a definition that two reasonable parties read differently. Common gaps include buyer discretion over underwriting appetite, accounting policies that change after completion, ambiguous treatment of new business, and silence on what happens if capacity is withdrawn.

Evidence is the second gap. An earn-out target may depend on bordereaux, underwriting files, claims records and finance ledgers that are held in different systems by different teams. If the seller has limited access after completion, proving performance becomes harder. If the buyer controls the data, the seller may challenge its completeness. Underwriters should treat the evidence chain as part of the exposure, not as an administrative afterthought.

Governance is the third. Who calculates the metric? Who audits it? What happens if the parties disagree? Is there a set-off against other claims? Are there caps, baskets or time limits? An earn-out with a clear target but a weak dispute mechanism is still a weak earn-out.

A 2026 underwriting checklist

First, map each metric to its evidence source. For every target, identify the bordereau, ledger, claims report or underwriting file that will prove it, and confirm who will hold that evidence after completion.

Second, test control and discretion. Establish what the buyer can change without triggering a remedy: appetite, pricing, claims philosophy, systems, staff and capacity. Where discretion is broad, the earn-out should be priced for behavioural risk, not just performance risk.

Third, stress the base case and the downside. Model a reasonable shortfall in retention, a deterioration in loss ratio and a delay in commission recognition. Consider whether the same event affects more than one metric at once.

Fourth, review integration covenants. A seller's continued role, access rights, non-compete obligations and information rights should be consistent with the metric being measured. If the seller is expected to influence performance, the contract should say how.

Fifth, confirm regulatory and permissions continuity. A change of control, delegated authority or outsourced function can affect the MGA's ability to write the business on which the earn-out depends.

Sixth, price the evidence gap. Where data is incomplete, systems are being migrated or definitions are untested, the underwriter should assume a higher dispute probability and a longer resolution period.

Finally, set monitoring triggers. An earn-out is not a completion event. It is a live exposure that should be reviewed against bordereaux, claims trends and integration milestones until the final calculation is settled.

Pricing the promise, not the narrative

The earn-out mirage is the belief that a signed target converts an intangible promise into a certain payment. It does not. It converts a valuation gap into a contingent exposure with defined triggers and undefined behaviour. Underwriters who read the definitions, test the evidence and price the discretion are better placed to distinguish a genuine performance incentive from a dispute waiting to be calculated.