Structuring earnouts in a volatile rate environment: what CFOs need to get right

Earnouts have always been a tool for bridging disagreement. Buyer thinks the target is worth $80 million; seller insists on $110 million. An earnout splits the difference by tying a portion of the purchase price to future performance. Simple in concept. In execution, particularly when rates are volatile, the mechanics can produce outcomes neither party anticipated and disputes that end up in litigation rather than integration.

The confusion stems partly from accounting treatment, partly from discount rate assumptions baked into deal models, and partly from the fact that earnout structures negotiated in a low-rate environment simply behave differently when the rate environment shifts. With Kevin Warsh signalling further Fed tightening and the leading economic index continuing to soften as of mid-2026, CFOs closing deals today are operating in a context where those baked-in assumptions deserve much harder scrutiny.

Why it matters for the CFO specifically

The CFO sits at the intersection of deal pricing, accounting, and risk management in a way that no other executive does. When a board approves a deal with $30 million of contingent consideration, the CFO is the one who must explain, at every subsequent quarter-end, how that liability is being measured and why it has moved.

Under IFRS 3 and ASC 805, contingent consideration classified as a liability is remeasured at fair value through profit and loss at each reporting date. That means a change in the discount rate, a shift in the probability weighting of milestones, or an update to the projected cash flows can create income statement volatility that has nothing to do with operating performance. Analysts notice. Boards ask questions. The CFO who did not anticipate this dynamic in deal design is the one who has to explain it after the fact.

Beyond accounting, there is a capital allocation question. An earnout is, functionally, a contingent debt instrument. It competes with other uses of cash. In a higher-rate environment, the opportunity cost of that future cash outflow is not trivial, and anydeal structuring decision that ignores this is pricing the deal incorrectly.

How it actually works: the mechanics and the rate problem

An earnout specifies a metric (revenue, EBITDAEBITDAEBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) measures a company's operating profitability before financing and accounting decisions, used to compare core performance across firms.View full definition →, a regulatory milestone), a measurement period (typically one to three years post-close), and a payment formula tied to performance against that metric. The total consideration is the upfront payment plus the present value of the expected earnout.

Here is where rate volatility bites. Suppose a deal closes in Q1 2025 with a $25 million earnout tied to EBITDA targets over 24 months. At deal signing, the discount rate applied to that contingent payment is 7%. By the time the earnout period ends, rates have moved materially. The fair value of the liability at each remeasurement date reflects that movement, even if the underlying business is performing exactly as modelled. The seller watches the liability shrink on the buyer's balance sheet and assumes the buyer is engineering the outcome. The buyer's finance team is simply following the accounting standard.

A concrete example clarifies this. Imagine a $15 million earnout payment expected with 70% probability, due in 18 months, discounted at 7%. Fair value at deal close: roughly $9.6 million. If rates move to 9.5% over the next two quarters, the fair value drops to approximately $9.1 million purely from the rate move, before any revision to the probability estimate. That half-million-dollar swing flows through the income statement. In a deal with multiple earnout tranches, these swings accumulate.

The solution is not to abandon discount rates but to be explicit about what rate is used, how it will be updated, and whether the earnout metric itself should be adjusted if the financing environment changes materially. Some deal teams are now negotiating rate adjustment clauses: if the risk-free rate moves more than a defined threshold during the earnout period, the milestone targets are recalibrated. This adds complexity but reduces the scope for bad-faith disputes.

Choice of metric matters as much as the rate. Revenue-based earnouts are easier to verify and harder to manipulate than EBITDA-based ones, because the buyer controls cost allocation decisions post-close. In technology acquisitions, including early-stage AI companies where revenue durability is genuinely uncertain (a risk that recent investor commentary around Anthropic's post-IPO prospects has made vivid), milestone-based earnouts tied to product delivery or customer retention can be more durable than pure financial metrics.

When to use earnouts and when not to

Earnouts work best in four situations: the target's value depends heavily on one or two future events that are genuinely uncertain today; the seller will stay involved in running the business post-close; the metric is clean, auditable, and not easily distorted by post-close management decisions; and both parties have similar expectations about what "normal" operating conditions look like over the earnout period.

They fail predictably in several others. If the seller exits immediately post-close, the earnout creates misaligned incentives with the remaining management team. If the business will be integrated quickly into the buyer's operations, isolating the target's performance for earnout measurement becomes almost impossible. If the metric is EBITDA and the buyer controls overhead allocation, sellers will spend the earnout period in dispute rather than building the business.

In volatile rate environments specifically, long earnout periods (beyond 36 months) amplify every one of these problems. The present value sensitivity to rate changes grows with duration. Milestone uncertainty compounds. The probability of operational disputes that contaminate the financial measurement also rises.

The honest guidance: use earnouts to close genuine valuation gaps, not to paper over inadequatefinancial due diligence. If the buyer cannot form a view on value because the diligence was insufficient, an earnout defers the problem rather than solving it. The rate environment then adds a layer of complexity on top of an already fragile structure.

Earnouts can be well-designed or badly designed. The difference, in a period of genuine rate uncertainty, lies in the specificity of the discount rate methodology, the choice of metric, and the willingness to build adjustment mechanisms into the agreement itself. A CFO who treats contingent consideration as a negotiating footnote rather than a financial instrument will find it on the income statement every quarter as a reminder of that oversight.