Earn-out: win-win structure or time bomb?

Short answer. An earn-out — a portion of the purchase price contingent on the target's post-closing performance — is useful to bridge a valuation gap or to retain the seller-CEO during a transition. But a poorly drafted clause turns into litigation: manipulable indicators, contested management scope, unfavourable tax, deadlocked governance. Building a sound earn-out means defining indicators that are verifiable and outside the parties' direct control, framing management scope, securing the tax treatment and anticipating exit. This article details the methodology and the points that tip the clause one way or the other.

An earn-out is a deferred-price mechanism. Part of the price is paid at closing; the balance — the contingent payment — is owed only if the target meets predefined targets over a defined period.

Three typical use cases:

• Valuation disagreement. The seller projects growth the buyer is unwilling to underwrite at face value. The earn-out crystallises the upside if it materialises.
• Operational continuity. The seller-CEO stays for 12–36 months. The earn-out incentivises performance and retains them during transition.
• Buyer-side risk reduction. The buyer pays cash for the secured value and conditions the additional payment to the confirmation of plan assumptions.

What an earn-out is not for: making up for a buyer's financing shortfall. Confusing vendor finance with earn-out creates hybrid, highly contentious structures.

The indicator on which the earn-out is calculated drives 80% of the litigation risk.

2.1. Revenue: simple but manipulable#

Revenue fits hyper-growth targets where the buyer wants to evidence the maintained sales trajectory.

2.2. EBITDA: relevant but adjustment-sensitive#

EBITDA is the most-used indicator. It must be defined line by line: explicit list of permitted adjustments, exclusion of intra-group charges unrelated to ordinary operations, treatment of exceptional items.

2.3. Net income: avoid#

Net income is heavily exposed to buyer-driven choices (depreciation policy, tax consolidation, intra-group interest). Unsuited to earn-out except with very heavy adjustment clauses.

2.4. Operational metrics: useful as complements#

For SaaS and subscription models: ARR, MRR, NRR, churn. Less manipulable than book result and aligned with the business model. Require precise contractual definition and external annual audit.

2.5. Summary#

During earn-out, two logics collide: the buyer's (integrate, optimise, sometimes cut variable costs that depress short-term EBITDA) and the seller's (maximise the contractual performance).

Mandatory clauses:

• Reasonable-care covenant: maintain commercial, marketing and HR policies consistent with track record;
• Limited list of decisions requiring seller consent: restructurings, collective layoffs, product line discontinuation, intra-group transfers, management fee recharges;
• Annual management fee cap charged by buyer or affiliates to the target;
• Quarterly steering committee with seller access to accounts;
• No-reorganisation covenant preventing the transfer of activity outside the earn-out perimeter.

Without these clauses, the buyer can — in formal compliance — empty the earn-out of substance. French case law distinguishes legitimate commercial strategy from contractual abuse (Cass. com.) — but litigation lasts years.

4.1. Individual seller: capital gains regime#

Deferred consideration paid to an individual seller is taxed under the capital-gains regime applicable to the original sale, as detailed in the BOFiP (BOI-RPPM-PVBMI-20-10-20-50). Continuity with the original regime is generally maintained, subject to:

• the earn-out clause must be in the original sale agreement;
• the additional payment must be directly tied to the company's activity;
• the recipient must be the original seller.

4.2. Corporate seller: participation shares regime#

Where the seller is a company (typically a holding selling a subsidiary), deferred consideration follows the participation-shares regime when conditions are met. The 12% expenses add-back generally applies. Always verify scope via the current BOFiP.

4.3. Buyer side: additional acquisition cost#

For the buyer, deferred consideration adds to the acquisition cost of the shares. Capitalised. Not deductible from corporate tax in the year of payment, except in specific cases (asset deal with amortisation, allocated goodwill).

4.4. Tax summary#

5.1. Exhaustive definitions#

The earn-out clause needs a glossary: EBITDA, perimeter, reference period, extraordinary events, intra-group charges, integration costs. Without it, every word becomes debatable.

5.2. Calculation method and validation procedure#

• production of annual accounts by the buyer within a defined timeframe;
• seller's right to a contradictory audit at their expense;
• dispute procedure: amicable attempt, expert-arbitrator, court of competent jurisdiction.

5.3. Expert-arbitrator clause (Article 1592 Civil Code)#

Article 1592 of the French Civil Code allows parties to entrust a third party with price determination. The most efficient tool to settle an earn-out calculation dispute without litigation. Designation should be done in the SPA, with candidate list and procedure.

5.4. Floor and cap#

Often negotiated: floor (minimum amount due if base conditions are met) and cap (maximum amount). Calibrates risk for both parties.

5.5. Acceleration clause#

If the buyer resells the target, merges it or discontinues activity, the earn-out becomes immediately due — on a contractually defined formula (often the cap, sometimes an average).

Earn-outs work in two configurations:

• Demonstrated hyper-growth: the target evidences a trend (ARR, margin, new contracts) the buyer values prudently;
• Organised transition: the seller stays 12–24 months, the earn-out retains them on aligned indicators.

Outside these, earn-out is often a polite way to defer a valuation disagreement neither party wanted to settle. In 30–40% of cases, that disagreement resurfaces as litigation at settlement. Our conviction: when the valuation gap exceeds 20%, renegotiate the multiple or the structure (asset deal vs. share deal) — don't paper over with an unbalanced earn-out.

The most underestimated risk is not tax litigation but relational deterioration during the earn-out. The seller who stays operational but loses control suffers each decision they'd have made differently. The buyer who pays part of the price on performance experiences each spend as margin erosion. After 18 months, trust often breaks; the seller leaves before period end; the final calculation happens in a hostile climate. The contract must anticipate this drift: exit conditions, pro-rata calculation, mandatory mediation.

Seller side:

• accepting an earn-out = accepting deferred cash. What share of the global price is contingent? Above 30–40%, non-receipt risk becomes material;
• demand a readable and verifiable indicator, not a black box;
• plan your operational exit.

Buyer side:

• an earn-out reduces upfront cash but raises integration cost: dedicated reporting, committees, audits;
• structure so the contingent payment is payable from the target's cash generation, not the buyer's equity.

• Evolving tax doctrine: monitor the BOFiP on linkage of deferred consideration to the original regime; any reclassification is costly.
• Management agreements: recent case law scrutinises management fees billed by the holding to the target. Cap and document.
• ESG indicators: emergence of earn-outs tied to sustainability metrics (CSRD). Frame measurement and audit.
• R&D credits: if the target benefits from tax credits, secure their treatment in the contractual EBITDA computation.

Example 1 — Growth-stage B2B SaaS#

Asking price: €12m. Buyer values €9m (6× multiple on €1.5m adjusted EBITDA). Seller forecasts €2.5m EBITDA in year 2. Earn-out structure:

• €9m at closing;
• up to €3m if year-2 adjusted EBITDA ≥ €2.5m;
• floor €0 if < €1.8m, linear between €1.8m and €2.5m.

Example 2 — Consulting boutique#

Price €4m. €3.2m at closing, €0.8m earn-out contingent on the retention of the top three clients over 24 months and cumulative EBITDA ≥ €1.2m. Anti-reorganisation clause imposed by seller.

These examples are illustrative. Any real structuring requires contradictory analysis and dedicated legal-tax counsel.

Is the earn-out always taxed under capital gains?#

For an individual seller, linkage to the original regime requires that the clause be in the sale agreement and that BOFiP conditions are met. Otherwise reclassification risk arises — hence the need for careful drafting.

Can earn-outs be indexed to non-accounting indicators?#

Yes, provided they are measurable, verifiable and outside the exclusive control of one party. Operational indicators (key clients retained, contracts signed) commonly complement EBITDA.

What duration for an earn-out?#

12 to 36 months typically. Beyond that, reorganisation and strategic divergence risk rises sharply. Under that, performance visibility is too short.

What price share can be earn-out?#

Market practice: 10–30%. Above 40%, the imbalance turns the seller into the buyer's banker — to be avoided except in dedicated structures.

What if the buyer resells the target during the earn-out?#

With a well-drafted acceleration clause, the earn-out becomes immediately due on a contractual formula. Without it, the seller may have to prove the resale was meant to defeat the earn-out — uphill battle.

An earn-out is a powerful tool when it materialises an expected value creation, and a trap when it disguises a valuation disagreement. Well-drafted, it aligns interests and smooths transition. Poorly drafted, it fuels litigation longer than the earn-out period itself. The CPA's and counsel's job is to turn the clause into an executable, verifiable, compliant mechanism — not a wager on parties' good faith.

Last updated: 28 April 2026.