7 Mistakes That Kill Deals Before Closing (and How to Avoid Them)

Minimalist M&A closing process represented by a transaction binder and seven precise checkpoints on a deep navy background

A signed letter of intent is not a closed transaction.

The period between LOI and closing is where buyers test the business, lenders test the capital structure, and both parties test whether the deal can withstand scrutiny. In the 2026 middle-market M&A environment, that scrutiny is increasing. Quality of earnings reviews are more detailed. Buyers are stress testing forecasts, working capital, customer concentration, and operational continuity. Owner-dependent businesses face particular retrade risk.

A deal can have an attractive valuation and still fail before closing.

The common causes are identifiable. More importantly, most can be addressed before they become deal-killing findings.

1. Presenting Financials That Cannot Survive a QoE

A buyer does not underwrite reported EBITDA. A buyer underwrites defensible EBITDA.

Quality of earnings reviews examine revenue recognition, expense classification, add-backs, related-party transactions, working capital, and the consistency of reported results. They also test whether the earnings profile presented in the marketing materials reflects the business’s recurring performance.

Weak financial preparation creates several problems:

  • Unsupported owner add-backs.
  • One-time revenue presented as recurring.
  • Expenses deferred or misclassified.
  • Personal and business expenses not clearly separated.
  • Differences between tax returns, general ledger data, and management reporting.
  • Forecasts that do not reconcile to historical performance.

The valuation impact is direct. If a transaction is priced at a multiple of EBITDA, every dollar removed from normalized EBITDA reduces enterprise value.

A recent 2026 analysis of lower-middle-market dead deals attributed approximately 21.3% of failed transactions to QoE EBITDA discrepancies. That figure is directional, not universal. The underlying lesson is consistent: financial ambiguity creates price risk, and price risk creates retrade risk.

Avoid it

Prepare for the buyer’s QoE before entering exclusivity.

Build a defensible normalization schedule. Document every adjustment. Reconcile management reports to the accounting records. Explain unusual trends before the buyer asks about them. If the business has not been subject to a sell-side QoE, consider conducting one before the process begins.

The objective is not to make the numbers look better. It is to make them hold up.

Organized financial model, contract pages, and verification markers representing rigorous transaction diligence

2. Treating Diligence as a Checklist Instead of a Stress Test

Diligence is not an administrative exercise. It is a structured attempt to identify where the business may fail under pressure.

In 2026, buyers are examining more than historical financial statements. They are testing:

  • Customer retention and concentration.
  • Contract assignability and change-of-control provisions.
  • Compliance and licensing.
  • Litigation and employment matters.
  • Technology, systems, and data security.
  • Supplier dependencies.
  • Insurance coverage.
  • Operational continuity.
  • Forecast performance under downside scenarios.

A recent analysis citing Axial’s dead-deal data identified non-QoE diligence findings as the largest category of failed transactions, accounting for approximately 25.3% of unsuccessful deals in its 2025 sample.

The finding may be legal, operational, commercial, or contractual. The pattern is the same: the buyer discovers that the business is not precisely what was represented.

Avoid it

Run an internal diligence process before the buyer begins its review.

Create a complete data room. Assign owners to each workstream. Review material contracts with counsel. Confirm licenses and permits. Reconcile customer data. Identify open claims and unresolved compliance matters. Test the downside case rather than relying only on the base case.

A disciplined process surfaces problems while there is still time to solve them.

3. Leaving the Business Dependent on the Owner

Owner dependence is one of the most difficult risks to explain away because it is embedded in how the company operates.

If the owner controls the largest customer relationships, approves every major decision, manages key employees, or holds critical institutional knowledge, the buyer is not acquiring a durable operating business. The buyer is acquiring a business plus a transition risk.

This risk becomes more severe when:

  • Processes are undocumented.
  • The management team lacks decision-making authority.
  • Customer relationships are personal to the owner.
  • Pricing and vendor decisions run through one individual.
  • The owner is the only person who understands the financial model.
  • No transition plan exists beyond a general promise to remain available.

Buyers may respond with a lower valuation, an earnout, a seller note, extended employment requirements, or additional indemnification. In some cases, they walk.

Avoid it

Institutionalize the business before the sale process.

Document operating procedures. Establish clear reporting lines. Transfer customer relationships to the broader team. Build a second layer of management. Define decision rights. Put key employment and incentive arrangements in writing.

The buyer needs evidence that the company can perform after the owner exits. Good intentions are not evidence.

A balanced network of independent business functions replacing a single owner-dependent operating node

4. Hiding Customer Concentration and Revenue Fragility

Customer concentration is not automatically a deal killer. Concealing it is.

A business with a large customer may still be attractive if the relationship is contractually durable, operationally integrated, and supported by a credible retention history. The risk increases when a material customer can terminate on short notice, represents a disproportionate share of revenue, or is tied primarily to the owner.

Buyers will examine:

  • Revenue by customer and location.
  • Gross margin by customer.
  • Renewal and churn history.
  • Contract duration and termination rights.
  • Pricing concessions.
  • Customer complaints and service levels.
  • Change-of-control provisions.
  • The strength of the relationship beyond the owner.

Commercial diligence often changes the risk profile assumed in the initial valuation. If one customer represents 30% of revenue and can leave with 30 days’ notice, the buyer may no longer underwrite the same earnings stream.

Avoid it

Quantify concentration early. Do not wait for the buyer to discover it.

Secure longer-term agreements where commercially appropriate. Diversify the customer base. Transfer relationships from the owner to the operating team. Build a written mitigation plan that explains what happens if a major customer reduces volume.

A credible mitigation plan does not eliminate concentration risk. It demonstrates control over the risk.

5. Assuming the LOI Protects the Original Price

An LOI establishes the framework for a transaction. It does not eliminate the buyer’s ability to reassess the business during diligence.

A retrade occurs when the buyer seeks to change the price or terms after the LOI. Some retrades are justified by findings that materially alter the economics. Others arise because the original valuation was based on incomplete information or aggressive assumptions.

Common causes include:

  • EBITDA falling below the LOI figure.
  • Forecast growth failing to materialize.
  • A major customer leaving.
  • Working capital requirements exceeding expectations.
  • Debt capacity declining.
  • Unresolved legal or operational issues.
  • Add-backs that cannot be supported.

One 2026 analysis of failed lower-middle-market transactions attributed approximately 14.7% to renegotiation challenges. Not every retrade ends a deal. The transaction fails when the gap between the revised economics and the seller’s expectations cannot be resolved.

Transaction checkpoints from LOI through closing, with a retrade risk point resolved before the final closing mark

Avoid it

Develop a valuation narrative that is supported by evidence.

Agree on definitions before the LOI where possible. Clarify EBITDA adjustments, working capital methodology, debt-like items, and the treatment of unusual expenses. Identify known risks and determine how they should affect structure.

The goal is not to prevent every adjustment. It is to prevent surprises from becoming negotiations.

6. Underestimating Financing and Capital Structure Risk

A qualified buyer still needs a financeable transaction.

In a tighter underwriting environment, lenders scrutinize cash flow, leverage, collateral, customer concentration, and downside performance. A deal may fail when the buyer cannot secure the debt or equity required to fund the agreed purchase price.

Financing risk is higher when:

  • The buyer relies on aggressive leverage.
  • The debt service coverage ratio is weak.
  • EBITDA depends on disputed adjustments.
  • Cash flows are volatile or seasonal.
  • The capital structure leaves no room for underperformance.
  • Lender diligence begins too late.
  • Equity commitments are informal or incomplete.

A recent 2026 deal-failure analysis attributed approximately 10.7% of failed transactions to financing constraints. The mix changes with market conditions, but financing certainty remains a closing requirement.

Avoid it

Evaluate the capital stack at the beginning, not after the valuation is agreed.

Coordinate with lenders early. Use realistic leverage assumptions. Stress test the model against lower revenue, margin compression, delayed collections, and higher working capital needs. Confirm equity sources and financing conditions in writing.

Saltwater’s capital structuring and financial modeling services are designed to connect the transaction thesis to a financeable structure. Strategy without financing certainty is incomplete.

7. Letting Performance and Working Capital Slip Between LOI and Close

The business must continue performing while the transaction is underway.

Diligence can consume management attention. Employees may become distracted. Customers may sense uncertainty. Owners may defer decisions because they expect the buyer to take over. These disruptions create operating risk at the exact moment the buyer is watching most closely.

Buyers also examine working capital closely. A disagreement over the normalized working capital peg can delay closing or reduce proceeds. Inventory, receivables, payables, seasonal fluctuations, and deferred maintenance all affect the amount of working capital required to operate the business after closing.

A recent dead-deal analysis attributed approximately 8% of failed transactions to business underperformance during the process. The percentage is not the central issue. The operating principle is.

The business must be managed as though no sale is occurring.

Avoid it

Protect revenue. Maintain service levels. Retain key employees. Monitor collections. Control expenses. Track working capital weekly. Escalate performance variance immediately.

Define the working capital methodology early. Saltwater’s working capital advisory resource addresses the financing and liquidity issues that can affect transaction readiness.

Execution Is the Difference

Most deal failures are not random. They are the result of unresolved issues becoming visible too late.

The strongest defense is preparation before the LOI:

  1. Clean and reconcile the financials.
  2. Validate normalized EBITDA.
  3. Run internal financial, legal, and operational diligence.
  4. Reduce owner dependency.
  5. Quantify customer and contract risk.
  6. Stress test the capital structure.
  7. Maintain operating discipline through closing.

This work requires more than advice. It requires ownership of the process.

Saltwater provides transaction advisory services that connect analysis, coordination, and execution. We build the models, organize diligence, coordinate lenders and advisors, review the structure, and remain involved through the closing process.

We do not treat the closing table as someone else’s responsibility.

Bring us the transaction early. We will identify the pressure points, explain what can be fixed, and give you a practical view of what it will take to close. Contact Saltwater Advisory Group to present the situation for evaluation.

Clarity. Discipline. Closure.

Sources and Further Reading