A MAC clause provides protection only when its trigger can be applied

A MAC is a negotiated condition, not a general escape route

A MAC clause is usually drafted as a condition precedent or a termination right. It identifies a defined change between signing and completion that permits a party to refuse completion, terminate or seek a negotiated outcome. The clause is therefore part of the contractual risk allocation, rather than a general statement that a buyer may reassess the transaction.

General wording such as a material adverse effect on the business, financial condition or prospects of the target identifies the commercial concern but leaves difficult questions unanswered. What is material, compared with which period, measured under which accounting principles and determined by whom? A Dutch court applying the agreement will need answers to those questions before deciding whether a material adverse change has occurred.

A MAC can be drafted as a suspensive or a resolutory condition. Disputes over closing conditions underline the value of objective standards, a defined timetable and a workable evidence process.

The trigger needs a comparator and a number

A qualitative trigger can work for a discrete event, such as loss of a named licence, termination of a named key contract or destruction of a specified facility. It is less useful for general trading performance. A quantified trigger should define the relevant metric, the reference accounts, the measurement period, the accounting policies and any permitted normalisation.

An EBITDA decline may be measured against the same period in the previous year, budget or management forecast, but those alternatives allocate risk differently. A clause referring to forecast must identify which forecast and whether it is adjusted for changed scope. The seller and buyer should also agree whether the threshold is tested at a single date or over a sustained period.

Evidence matters as much as the threshold. The party invoking the clause should provide a notice describing the event, calculation and supporting information. The other party should have an opportunity to respond. An independent accountant or expert can determine a technical metric, while legal questions of interpretation remain subject to the agreed dispute forum.

Carve-outs state the risks the buyer accepts

MAC clauses commonly exclude general economic conditions, sector-wide developments, changes in law, political developments and market disruption. Those exclusions prevent a target-specific condition from becoming an allocation of broad market risk. The drafting should state whether the exclusion applies even where the target is affected more severely than comparable businesses.

The disproportionate-effect exception returns some risk to the seller. It should identify the comparator group, the method of measuring disproportionate impact and the baseline for the comparison. A vague exception can recreate the uncertainty that the carve-out was intended to remove.

The clause should also address known matters. A matter identified in diligence, disclosed in the disclosure letter or reflected in the price should generally not become a MAC unless the parties say otherwise. That alignment with warranty qualifications and disclosure prevents the same event from generating inconsistent rights.

Statutory remedies have a narrow role

Art. 6:258 DCC permits a court to amend or terminate an agreement because of unforeseen circumstances, but the threshold is high and the provision is not a replacement for agreed closing protection. The question is not merely whether circumstances changed, but whether the parties allocated that risk when contracting. A detailed MAC clause will often be central to that analysis.

The standards of reasonableness and fairness may restrict reliance on a contractual right where that would be unacceptable. Courts apply them with restraint in commercial agreements. Statutory dissolution for breach is frequently excluded in acquisition agreements to the extent permitted by law, and it does not convert ordinary market deterioration into a termination right.

A repeated warranty at completion can cover a different risk. It asks whether a statement remains true, while a MAC asks whether a defined adverse change has occurred. A financing condition is different again, because it allocates the risk that debt is unavailable. The SPA should state whether these rights are cumulative, exclusive or subject to a hierarchy.

A MAC clause is also a negotiation protocol

The most useful MAC clauses state what happens after a notice. The parties may have a defined period to exchange information, obtain an expert determination or discuss a price revision before either party may terminate. That process does not convert the clause into an obligation to renegotiate, but it can preserve a transaction where the underlying issue is capable of being priced.

The notice should identify the alleged change, the calculation, the relevant exclusions and the evidence relied upon. A seller needs sufficient information to test the trigger, while a buyer needs a timetable that does not force completion before the evidence can be assessed. The long-stop date and any extension rights should accommodate that sequence.

The drafting should avoid treating ordinary post-signing volatility as a MAC by implication. If a specific risk matters, such as loss of a key customer or a regulatory prohibition, it is normally better addressed directly in a separate condition or repeated warranty. A MAC clause works best as the residual protection for a carefully defined category of target-specific change.

Completion remedies should be chosen in advance

If a material adverse change occurs, the SPA should say whether termination is automatic, elective or subject to a notice period. It should also preserve claims for breach of pre-completion covenants where appropriate and state the effect on confidential information, costs and exclusivity. A MAC condition that identifies only the trigger, but not the consequence, leaves a central part of the allocation unresolved.

Where the target is part of a group, the clause should define the perimeter against which the effect is assessed. A business unit, subsidiary or asset can be commercially central without representing the whole group. The definition should follow the business that is being acquired, including any agreed carve-out perimeter.