Earn-outs are structurally contentious. The parties to an M&A transaction use them to bridge a valuation gap — the seller believes the business will perform at X; the acquirer believes it will perform at Y; the earn-out pays out if X is right and doesn't if Y is. What makes them contentious in practice is that the measurement terms governing whether X or Y is right are defined in the agreement language, and the agreement language is frequently less precise than both parties' recollection of what they agreed to.
The earn-out litigation rate in M&A is meaningfully higher than disputes over other deal terms. The disputes are rarely about what happened — the revenue numbers aren't disputed. They're about what the defined terms in the measurement schedule mean when applied to circumstances that both parties believe they anticipated and drafted for.
What you need to extract before you sign
The measurement metric and its defined components. Start with the measurement metric — EBITDA, revenue, ARR, gross profit, customer count, product milestone achievement. Then trace every defined term used in that metric's definition. "Revenue" is almost never defined as a standalone term; it typically cross-references a section of the agreement or an accounting standard. That cross-reference may include or exclude deferred revenue, may or may not apply revenue recognition timing consistent with the target's historical practice, and may contain exceptions that weren't discussed in deal negotiations but appear in the drafting.
The extraction task: produce a flat map of the measurement metric with every defined component resolved. Not "revenue as defined in Section 2.1" — but the full chain: what's included, what's excluded, what accounting treatment applies, and where each determination comes from in the agreement.
Exclusions and adjustments. Most earn-out measurement schedules include exclusions from the metric — items that are removed from the calculation. Extraordinary charges. One-time transaction costs. Integration costs post-close. Purchase accounting adjustments. These exclusions determine whether the earn-out target is achievable given the acquirer's post-close operational decisions.
The critical analysis: are the exclusions reciprocal? If the agreement excludes integration costs from the calculation, does that exclusion benefit both parties symmetrically, or does it allow the acquirer to classify certain costs as "integration" in ways that reduce the metric and make the earn-out target harder to achieve? Are there caps on excluded amounts? A cap on integration cost exclusions limits the acquirer's ability to shift costs into a non-measuring category.
Operating covenants. Post-close operating covenants govern what the acquirer can and cannot do during the earn-out measurement period. The standard covenant — "operate the business in a manner consistent with past practice" — is a particular source of future disputes. It sounds clear. It is not. What counts as "consistent with past practice" when the acquirer needs to make a strategic decision about the target's go-to-market model, or when market conditions have changed?
Specific operating covenant language to extract: any commitment to maintain specific headcount levels, any restriction on customer contract renegotiation during the earn-out period, any obligation to provide specified resources to the target business, any prohibition on discontinuing product lines. These are the provisions that become the subject of post-close disputes when the acquirer makes an operational decision the seller believes breached the covenant.
Acceleration triggers. Certain events accelerate the earn-out payout — the earn-out is paid in full regardless of whether the measurement period has elapsed or whether the metric has been achieved. Common triggers: a subsequent sale of the acquired business to a third party, the acquirer's material breach of an operating covenant, the acquirer's insolvency. The question to resolve before signing: is the acceleration trigger list comprehensive, and does the language of each trigger actually cover the circumstances both parties intend it to cover?
A seller who negotiates an acceleration trigger on "subsequent sale" wants to know that if the acquirer sells the business to a third party in year two of a three-year earn-out, they receive the full earn-out amount. Whether the trigger language covers a partial asset sale, a spin-out, a sale of a controlling interest while the acquirer retains a minority — these aren't hypotheticals. They're scenarios that come up, and the trigger language may or may not address them.
Dispute resolution mechanics. Most earn-out agreements specify a dispute resolution process: an independent accountant or arbitrator is appointed to resolve disagreements about whether the earn-out metric was achieved. The extraction task: what exactly is the accountant or arbitrator authorized to determine? Scope of authority matters here. Some dispute resolution provisions authorize the accountant to recalculate the metric. Others authorize only a review of whether the acquirer's calculation was consistent with the agreement's accounting policies. If the dispute is about whether a cost exclusion was properly applied, the scope of authority determines whether the accountant can rule on it.
After signing: the reference document problem
An earn-out structure review has two useful windows: before signing, and after signing but before the measurement period ends. Before signing, the extraction output informs negotiation — definitional gaps can be corrected in the agreement. After signing, the extraction output becomes the reference document when disputes arise.
The practical reality of post-close earn-out periods is that the parties are no longer in the same negotiation posture. The deal team has moved on. The lawyers who drafted the earn-out provisions may not be involved in the post-close dispute. The parties are left with the agreement language — and their respective recollections of what they meant — as the governing text.
An extraction of the earn-out structure at signing creates a documented reference that both parties can use during the measurement period. When a question arises about whether a specific cost is excluded from the metric, the reference document says: here is the exclusion language, here is the defined term, here is the clause citation. It doesn't resolve the dispute — that's an interpretation question for deal counsel. It does mean both parties are arguing from the same text, not from separate recollections.