Earn-outs: the hinge mechanism of modern SME deals

Three in ten Benelux lower-mid-market SME deals closing this year include an earn-out, roughly double five years ago. Not because sellers got more romantic about deferred consideration, but because earn-outs are an increasingly dominant way to bridge a price gap when reasonable doubt exists about future performance.

A well-designed earn-out is a precision instrument. A poorly designed one is a 24-to-36-month minefield with a seller who feels robbed and a buyer who feels held hostage. The difference comes down to six concrete design choices.

When to use an earn-out

Three legitimate uses, and as many illegitimate ones. Legitimate: (1) unproven growth pipeline, seller claims €500k → €800k EBITDA via newly signed customer, buyer wants to see realisation; (2) customer concentration or owner dependence, earn-out tied to retention; (3) buyer synergy claim, only paid if synergies actually land. Illegitimate: as a price compromise where neither party expects full payment; as a financing band-aid; as a punishment for structural weakness the seller failed to fix.

Six design variables

1. Duration. 12, 24 or 36 months. Under 12 rarely shows a real trend; over 36 becomes operationally untenable.
2. Gating metric. Revenue (easy, manipulable), EBITDA (closer to value but vulnerable to allocation disputes), customer retention (best for relationship-driven deals), specific KPIs (works for specific synergy claims). Choose the one that maps to the buyer's real worry.
3. Cap and floor. A cap protects the buyer from upside already in the price. A floor protects the seller from exogenous shocks. The combination is what makes it fair.
4. Operational control during the period. If the seller stays on (~60% of cases) define autonomous vs. joint vs. buyer-only decisions. If the seller leaves, define what counts as earn-out-hostile buyer behaviour (transferring customers to other group entities, predatory pricing).
5. Calculation and payment mechanism. Annual computation on audited figures, payment within 60 days, dispute resolution via independent accountant with binding arbitration. Not "good faith."
6. Change-of-control protection. Acceleration clause if the buyer is itself acquired during the earn-out period, typically at 75 to 100% of cap.

A worked example

Anonymised: B2B SaaS in Antwerp, €1.8M ARR, owner delivers 80% of sales. Sale price €9M. Structure: €7M cash at closing (78%); €2M earn-out over 24 months gated at ≥90% of pre-closing top-10 ARR retention; cap €2M, floor €1M; seller stays 18 months as VP Sales with documented authority framework; quarterly computation with seller audit rights; 100% acceleration on a buyer change of control within 24 months. Outcome at 18 months: 94% retention, full €2M paid, no dispute. The earn-out protected the buyer against the specific risk that the seller would disengage post-closing, not against general market risk.

Four traps where earn-outs derail

1. Loose definitions. "EBITDA" without specifying which group cost allocations count. "Customer retention" without defining a retained customer.
2. Earn-out too large vs. cash. Above 25 to 30% of total value, both parties' incentives bend.
3. No cost-allocation discipline. Buyer starts charging 15% group overhead post-closing; EBITDA drops €150k; earn-out evaporates.
4. No dispute procedure. "Good faith" is not a contract clause. Pre-define the arbiter and timeline.

How Upswitch supports earn-out design

On any deal where our valuation shows a dependency discount or growth-uncertainty above 15%, we model an earn-out scenario alongside the all-cash one. The owner sees which structure maximises value: an earn-out that shifts 12 to 18 months of risk to the buyer with a gating metric measurable through our KPI integrations can produce 15 to 20% more total value than an all-cash deal at a lower headline. Not because earn-outs are inherently better, because the right earn-out solves the right uncertainty.

The anchor for "what is a fair earn-out target" lives in sector-comparable deals. Every earn-out model ties to the live sub-sector bands on the Upswitch Index, B2B SaaS, B2B services, specialty manufacturing. The methodology page documents how every band is derived, so seller and buyer work off one shared bench instead of two Excel tabs.