Fourteen months after closing
A software company acquired a smaller competitor. The purchase price included an earnout: additional payments to the founders if the acquired product hit revenue targets over two years.
Fourteen months in, the numbers are in dispute. The buyer's finance team says revenue is short of the first target. The founders — who now run a business unit inside the buyer — say the shortfall comes from the buyer's own decisions: a pricing change, a reassigned sales team, a delayed integration.
In-house counsel for the buyer is on a call with the founders' lawyer. The founders themselves are on the line. So is the buyer's CFO.
Everyone on the call will be in the same building on Monday.
A dispute inside a relationship that has to continue
Post-closing disputes — over earnouts, working capital adjustments, indemnity claims, representations and warranties — are common in M&A. M&A post-closing dispute negotiation has features that set it apart from ordinary commercial negotiation.
The counterparties are often insiders. Founders or sellers frequently become employees or executives of the buyer. The people in the dispute are also people the business depends on.
The contract mechanism matters. Earnout definitions, accounting principles, dispute resolution clauses and expert determination procedures often shape what can be argued and how it will be decided.
The numbers are contestable. Revenue recognition, allocation of costs, integration decisions and definitions of "ordinary course" give both sides legitimate arguments.
And winning can destroy value. A buyer that wins an earnout dispute and loses the founders may have paid for a business it can no longer run.
Separate the relationship from the dispute — explicitly
Name the tension early. "We have a real disagreement about the numbers, and we need to resolve it. We also need this team, and we'd like to resolve it in a way that doesn't damage that." Saying it out loud allows both sides to acknowledge the relationship without conceding the dispute.
Keep the operational conversation separate. Ongoing business decisions shouldn't be negotiated in the dispute call, and the dispute shouldn't bleed into daily management. Where possible, different people should handle each.
Watch the language. Accusations of manipulation or bad faith — on either side — make continued working relationships much harder. Describe the disagreement in terms of definitions, calculations and decisions.
Anchor in the contract, then the numbers
Go back to the mechanism. What does the agreement actually say about how revenue is measured, what counts, what accounting principles apply and how disputes are resolved? Many post-closing disputes are narrowed simply by reading the clause together.
Reconcile the calculations. Put both sides' numbers side by side and identify precisely where they differ. Disputes that seem large often turn on two or three specific items.
Separate the items. Treat each disputed item — a pricing change, a reallocated sales team, a delayed integration — separately. Some may be clear; others may be genuinely uncertain.
Know the default. If the parties don't agree, what happens? Expert determination, arbitration, litigation? How long, how costly, how public? That alternative frames every settlement discussion.
Look for structures, not just numbers
Adjust the earnout rather than just paying it. Extending the measurement period, resetting targets to reflect the buyer's decisions or adding milestones can resolve a dispute while keeping incentives aligned.
Tie resolution to retention. Where the founders' continued involvement matters, settlement terms that reward staying — rather than a single payment and an exit — can protect the business.
Address the underlying decision rights. Many earnout disputes arise because the agreement didn't clearly allocate operational control. Clarifying it going forward can prevent the next dispute.
Timing and notice
Raise disagreements early. Earnout and adjustment disputes are much harder to resolve when both sides discover them at the measurement date. Periodic reviews of the calculations during the earnout period surface disagreements while they're still small and the relevant decisions are still fresh.
Check the agreement's notice requirements. Purchase agreements commonly set deadlines and formats for disputing a calculation or making a claim. Missing them can affect a party's rights. Counsel on both sides should confirm those provisions before the first substantive conversation, not after.
Four ways it goes wrong
The litigator's frame, which treats the founders purely as adversaries and wins a dispute at the cost of the team.
The relationship avoider, who never names the tension and lets the dispute poison daily work.
The number-arguer, who argues totals instead of reconciling specific items against the contract.
The single-payment thinker, who looks only at how much to pay rather than at structures that keep incentives aligned.
Why this isn't trained
Deal lawyers and disputes lawyers are different people. The negotiators of the original deal often aren't involved when it goes wrong, and litigators may not understand the commercial context.
Post-closing disputes are private. They're usually resolved quietly, so junior lawyers rarely see how they're handled.
The relationship dimension is ignored. Negotiation training treats counterparties as outsiders. Here they're colleagues.
And practice scenarios lack the stakes. Colleagues playing founders don't bring the sense of betrayal, the pride in what they built or the knowledge that they'll see the CFO on Monday.
What corporate dispute simulation can rehearse
A ten-minute simulation can put in-house or outside counsel on a call with founders and their lawyer — aggrieved, commercially sophisticated and still inside the business — so counsel practices naming the tension, anchoring in the contract and exploring structures. The AI agents in Foretell AI play the founders, their counsel and the buyer's CFO consistently; the agreement, financials and dispute mechanism stay with the legal team.
Four versions to build:
- The aggrieved founder, who believes the buyer’s decisions caused the shortfall.
- The contract-focused counsel, who argues strictly from definitions.
- The CFO, who wants to minimize payment regardless of retention consequences.
- The founder considering leaving, where retention is the real stake.
Design caution. Earnout, working capital and indemnity provisions, accounting definitions and dispute resolution mechanisms vary by agreement and governing law. Modules must use the actual agreement and financial data. Nothing here is legal, accounting or tax advice.
Designing the module
Ten minutes, scored against a corporate dispute negotiation rubric.
Pass one — relationship. Did counsel name the tension between the dispute and the continuing relationship?
Pass two — mechanism and numbers. Did counsel anchor the discussion in the contract and reconcile specific items rather than totals?
Pass three — structure. Did counsel explore structural solutions — adjusted earnouts, retention-linked terms, clarified decision rights — rather than only a payment figure?
Rubric on observable behavior: Was the relationship tension named? Was accusatory language avoided? Were contract definitions referenced? Were calculations reconciled item by item? Was the dispute-resolution default explained? Were structural options proposed? Was retention addressed?
Item-by-item reconciliation is the measure. It turns a large, emotional disagreement into a list of specific questions — and specific questions can be resolved.
For corporate legal teams and M&A practices
Post-closing disputes are common and costly. How they're handled can determine whether an acquisition delivers value.
Retention is often at stake. Buyers that lose key founders in a dispute may lose the business they acquired.
It bridges deal and disputes skills. Simulation lets lawyers practice the commercial and interpersonal dimensions together.
And it's private. Junior lawyers rarely observe these negotiations; simulation provides exposure.
For law schools, business law and negotiation courses can use post-closing disputes to show that transactions continue long after signing.
Frequently asked questions
What is a post-closing dispute in M&A? A disagreement after an acquisition closes — commonly over earnouts, working capital or purchase price adjustments, or indemnity claims for breaches of representations and warranties.
How are earnout disputes usually resolved? Through negotiation, and if that fails, through the dispute mechanism in the purchase agreement — often expert determination, arbitration or litigation. Many are settled by adjusting the earnout's terms.
Why are earnout disputes difficult? Because the sellers often still work in the business, the numbers depend on contestable definitions and the buyer's decisions, and winning the dispute can cost the relationship that makes the business valuable.
How can buyers and sellers resolve post-closing disputes? By reading the contract mechanism together, reconciling specific disputed items, understanding the default dispute process and exploring structures — not just payment amounts — that keep incentives aligned.
The short version
They're arguing about the earnout on Friday and working together on Monday.
Name the tension out loud. Keep the dispute out of daily operations. Go back to the clause and read it together. Reconcile the numbers item by item. Know what happens if you don't agree. And look for structures — a reset target, a retention-linked payment, clearer decision rights — instead of only a number.
Winning a post-closing dispute is easy to do badly. Winning it without losing the people is the actual skill.
Foretell AI lets corporate legal teams and M&A practices build negotiation simulations — including earnout disputes, founder negotiations and relationship-preserving settlements like the one above — with configurable AI counterparties, recordings and rubric-based evaluation. If your lawyers first negotiate a post-closing dispute with the founders on the line, we're happy to walk through how other teams have structured it.