Insights

Between 20 and 40 percent of mid-market business transactions fail during the due diligence phase. Not in the early stages, before any real commitment has been made, but after a letter of intent has been signed, after the buyer has invested significant time and professional fees in the evaluation, and after the seller has spent months in process and begun mentally preparing for the transition. That's when deals die most often — not from lack of interest, but from something discovered that wasn't expected.

The good news in that statistic is what it implies about the other 60 to 70 percent: those deals closed. They survived due diligence not because the businesses were perfect, but because the sellers were prepared. They had anticipated what buyers would find, had addressed what they could, and had documented the rest honestly. Due diligence that is met with organized, responsive disclosure is a confirmatory process that builds buyer confidence. Due diligence that becomes a discovery exercise — where the buyer finds things the seller didn't disclose or didn't know — is where transactions unravel.

What Due Diligence Covers

The scope of due diligence in a mid-market transaction is comprehensive. Buyers are not just verifying that the financials add up — they are assessing the full risk profile of the organization they are about to acquire. The major workstreams:

Financial due diligence is typically the most intensive workstream. Buyers engage accountants to perform a quality of earnings (QofE) analysis — an independent review of the financial statements that verifies the reported earnings, tests the legitimacy of proposed add-backs, assesses the sustainability of revenue, and normalizes any unusual items. The QofE analysis is the buyer's version of what your advisor did when preparing the CIM; the goal is to confirm that the normalized EBITDA being used to price the transaction is accurate and defensible. The QofE will also assess working capital — the current level of receivables, inventory, and payables — and establish a target that will be used in the closing adjustment.

Legal due diligence covers the contractual and legal infrastructure of the business. Buyers will review all material contracts — customer agreements, supplier agreements, leases, employment agreements — for assignability, change-of-control provisions, and any terms that could complicate the transaction or create post-closing obligations. The corporate structure will be verified: share register, director and officer records, any shareholder agreements, and the history of any prior transactions involving the shares. Litigation history is a specific focus.

Operational due diligence assesses whether the business runs the way the CIM and management presentations described it. This typically includes facility visits, equipment inspections, conversations with operational management, and review of quality management systems, IT infrastructure, and process documentation. Buyers forming a management team or integration plan need to understand operations at a level of detail the CIM can't provide.

Tax due diligence reviews the corporation's tax compliance history and identifies any exposures — unfiled returns, outstanding assessments, aggressive positions, or transfer pricing issues in multi-entity structures. In transactions involving holdcos, family trusts, or complex ownership structures, tax DD becomes a significant workstream in its own right.

Environmental due diligence is standard for any business with real property, manufacturing operations, or activities that could generate environmental exposure. Phase I Environmental Site Assessments (desktop review) are the starting point. When a Phase I identifies a recognized environmental condition (REC) — an area of potential contamination — buyers commission Phase II assessments, which involve physical sampling of soil and groundwater. The cost and timeline implications of an unexpected Phase II can derail or significantly delay a transaction.

The Seller's Role: Responsive, Organized, and Transparent

The seller's job during due diligence is not passive. It is an active management challenge that requires coordination, responsiveness, and the right mindset.

Responsive. Buyers will submit due diligence request lists — sometimes structured documents with hundreds of items across multiple categories. The speed and completeness of your responses sets the tone for the buyer's experience. Delays are interpreted as disorganization or as reluctance to disclose. Sellers who respond to requests within 24–48 hours, with complete and organized documentation, signal a business that is managed professionally and transparently.

Organized. The virtual data room is your primary tool for managing the information flow. Documents should be logically organized, consistently named, and easy to navigate. Buyers and their advisors should not have to ask where to find things or request reorganization. A well-organized data room built before the due diligence process begins — not assembled on the fly as requests come in — reflects preparation and competence.

Transparent. This is the most important quality, and the hardest for some sellers to embrace. When due diligence uncovers something that you knew about but didn't proactively disclose, the buyer's reaction is not just about the issue itself — it's about what it tells them about the seller's behavior. If you didn't disclose this, what else didn't you disclose? That question, once raised in a buyer's mind, is very hard to put back.

The alternative — proactively disclosing known issues, with context and framing — typically produces a far better outcome. A seller who says "here is a matter you should be aware of, here is the background, here is how it has been addressed or managed" demonstrates control and candor. That's a seller you can do business with.

Common Deal-Killers Discovered in Due Diligence

Understanding the patterns that most commonly derail transactions gives sellers the opportunity to address them proactively. The most frequent causes of due diligence failures:

Undisclosed liabilities or litigation. A legal claim, regulatory exposure, or significant liability that appears in due diligence without prior disclosure is a serious credibility problem. The dollar amount of the exposure matters less than the fact that it wasn't mentioned. Resolution paths exist for almost every disclosed issue; undisclosed ones generate distrust that is harder to resolve.

Revenue concentration higher than represented. Buyers who discover in due diligence that customer concentration is materially worse than the CIM suggested — that one customer is 45% of revenue rather than the 25% indicated — are not just adjusting a number. They're questioning every other representation in the document. Accurate representation of concentration, including honest disclosure of the three, five, and ten-year trend in customer composition, is essential.

Key contracts with change-of-control provisions. A customer contract, supplier agreement, or lease that contains a clause allowing the counterparty to terminate or renegotiate on a change of ownership is a deal complication. Not necessarily a deal-killer, but it requires proactive management: the buyer needs to know, the counterparty may need to be approached, and the transaction timeline needs to accommodate the consent process. Discovering these provisions in the middle of due diligence, when there is no time to address them properly, is avoidable with early legal review.

Environmental contamination. The discovery of Phase II-level contamination — confirmed soil or groundwater contamination that requires remediation — is one of the most reliably transaction-disrupting events in manufacturing M&A. Remediation cost estimates can exceed the purchase price. Insurance coverage is complex. Timing is unpredictable. Sellers who conduct their own environmental assessment before going to market know their exposure and can address it or disclose it on their terms rather than the buyer's.

Tax non-compliance or significant exposure. Unfiled corporate tax returns, outstanding CRA disputes, aggressive tax positions that haven't been disclosed, or undocumented related-party transactions that raise transfer pricing questions — these create uncertainty that buyers translate directly into holdbacks, price reductions, or deal termination. The resolution is usually straightforward, but it requires time that a deal in progress often doesn't have.

How to Prepare: Starting 12+ Months Before Going to Market

The most effective approach to due diligence preparation is to conduct a pre-sale internal audit — an honest, systematic review of the same issues a buyer would examine, conducted while you still have time to address what you find.

Financial preparation. Ensure three to five years of financial statements are organized, consistent, and clearly reflect normalized EBITDA with documented, defensible add-backs. Resolve shareholder loans and related-party transactions. Update your fixed asset register and reconcile it to physical inventory.

Legal preparation. Review all material contracts for change-of-control provisions, assignment restrictions, and unusual terms. Ensure your corporate records are current — share register, director elections, any shareholders agreements. Identify and document any pending or threatened litigation. Verify that all required licenses and permits are current and transferable.

Environmental preparation. For manufacturing or industrial businesses, commission a Phase I ESA before going to market. If the Phase I indicates potential concerns, address them or get a Phase II done on your own timeline — which is always better than having the buyer drive the process with your transaction as the clock running. Compile your compliance records, waste disposal documentation, and storage tank records.

Data room preparation. Build the data room before a buyer asks for it. Organize documents logically, ensure everything required is present, and test the structure by asking yourself whether someone unfamiliar with the business could navigate it. The effort invested before the process begins pays back many times over in the speed and confidence of the due diligence process.

Preparation Is the Difference Between Confirmatory and Investigative DD

Due diligence, at its best, is a confirmatory process. The buyer has been told what the business is, what it earns, and what its condition is. Due diligence confirms that the representation is accurate. When the confirmation checks out, confidence builds, the process moves forward, and the transaction closes.

Due diligence, at its worst, is an investigative process. The buyer wasn't told about certain things, or wasn't told accurately, and is now discovering the reality through its own investigation. Each discovery raises the question of what else hasn't been told. Confidence erodes. The process slows. The buyer begins looking for an exit from the transaction, or for price adjustments that may bear little relationship to the actual magnitude of the issues found.

Sellers cannot control every due diligence outcome. But sellers who prepare thoroughly — who know their own business at the level of detail a buyer will examine it, who have addressed what can be addressed, and who disclose what they know honestly and with context — consistently produce confirmatory due diligence experiences. And confirmatory due diligence is how deals close.

Ready to approach due diligence from a position of strength? Talk to Conexus M&A about pre-sale preparation. We work with Atlantic Canadian business owners to identify and address the issues that most commonly derail transactions — before they become a buyer's discovery.