What happens during due diligence when selling a business?
Due diligence typically occurs after a Letter of Intent (LOI) is signed and before final closing, with buyers conducting a comprehensive investigation of your business over 30 to 90 days depending on deal complexity. During this period, buyers verify the accuracy of information you provided during marketing, identify risks that could affect the business's value or operations, and confirm that the business is what you represented it to be.
What due diligence is and why buyers conduct it
Due diligence is the buyer's formal process of validating claims made about your business and uncovering issues that could materially affect purchase terms or their decision to proceed. Buyers use this period to confirm financial performance, verify legal compliance, assess operational dependencies, and identify liabilities that could transfer with ownership.
The scope and intensity of due diligence scales with deal size and complexity. A $2 million retail business may face 30 to 45 days of review focused on financial records, lease terms, and inventory verification. A $20 million manufacturing operation with real property, environmental considerations, and complex supplier relationships may require 60 to 90 days and involve multiple specialized advisors.
Buyers typically structure purchase agreements to allow withdrawal or price renegotiation if due diligence reveals material discrepancies or undisclosed liabilities. Understanding what buyers examine — and preparing documentation in advance — reduces delays, builds buyer confidence, and minimizes the risk of post-LOI price adjustments.
Financial due diligence — what buyers examine
Financial due diligence examines 3 to 5 years of historical financial statements, tax returns, accounts receivable aging reports, accounts payable schedules, and revenue recognition practices. Buyers verify that reported earnings are accurate, sustainable, and free from accounting irregularities.
Quality of earnings analysis adjusts reported EBITDA for non-recurring items, owner compensation normalization, discretionary expenses, and revenue or expense timing issues to establish sustainable earnings. A buyer may add back a one-time legal settlement expense or normalize above-market owner salary, but they will scrutinize whether discretionary spending (vehicle allowances, family travel, personal expenses run through the business) represents genuine add-backs or inflated earnings claims.
Buyers verify tax compliance by reviewing filed tax returns, Canada Revenue Agency assessments and correspondence, GST/HST remittance records, payroll source deductions, and confirming no outstanding tax liabilities or disputes. Any history of CRA audits, reassessments, or unresolved tax positions triggers deeper investigation and often requires seller indemnification clauses in the purchase agreement.
Working capital adjustments at closing typically reconcile actual working capital levels against the normalized target working capital figure established in the purchase agreement, with post-closing true-ups common. Buyers verify accounts receivable collectability (aging beyond 90 days raises flags), confirm inventory is saleable and properly valued, and assess whether payables are current or aging in ways that indicate cash flow stress.
Legal and regulatory due diligence
Legal due diligence includes reviewing all material contracts — customer agreements, supplier contracts, leases, employment agreements, loan documents, and shareholder agreements — to identify change-of-control clauses, assignment restrictions, or termination rights triggered by the sale. A commercial lease with a landlord consent requirement, or a major customer contract that terminates on ownership change, can derail a transaction if discovered late in the process.
Buyers verify that the business holds all required licenses, permits, and registrations specific to its industry and jurisdiction, including business licenses, professional certifications, and regulatory compliance documentation. A food service business must demonstrate health permits are current. A construction company must prove bonding capacity and trade certifications are valid and transferable.
Personal Property Security Act (PPSA) searches are conducted in each relevant Canadian province to identify registered security interests against the business's assets. A PPSA registration indicating an equipment lien, inventory financing arrangement, or blanket security interest must be disclosed and resolved (or assumed by the buyer with appropriate price adjustment) before closing.
Litigation and dispute due diligence identifies any pending, threatened, or historical legal proceedings, regulatory investigations, workplace complaints, or arbitration matters that could create post-closing liability. Buyers ask for representations that no litigation is pending or threatened, but they verify this through searches of court records, regulatory filings, and employment tribunal databases.
Intellectual property due diligence verifies ownership and protection of trademarks, patents, copyrights, trade secrets, domain names, and proprietary processes, including confirmation that IP is properly registered and assigned to the business entity being sold. A business using a trade name without registered trademark protection, or software developed by contractors without proper assignment agreements, exposes the buyer to IP ownership disputes post-closing.
Operational due diligence — systems, processes, and key personnel
Operational due diligence examines the people, processes, and systems that generate the business's financial results. Buyers assess whether operations are replicable under new ownership or dependent on the seller's personal relationships, institutional knowledge, or daily involvement.
Buyers identify key employees whose departure could materially affect business operations and often require employment agreements or retention bonuses as a condition of closing. A services business where 60% of client relationships are managed by two employees creates concentration risk. Buyers may insist those employees sign employment agreements before closing, with retention bonuses paid from escrow funds if they remain through a transition period.
Buyers evaluate operational dependencies on the seller. Can the business function if the seller exits immediately, or does the business require a structured transition period where the seller trains the buyer, introduces key clients, and transfers institutional knowledge? Transition services agreements specifying the seller's post-closing role (duration, compensation, responsibilities) are common in businesses with significant operational seller-dependence.
Process documentation, standard operating procedures, employee manuals, and system access controls indicate operational maturity. A business with documented processes, cross-trained staff, and systems that function independently of any one person is more attractive and less risky than a business where critical knowledge resides in the seller's head or in undocumented tribal knowledge.
Customer and supplier concentration analysis
Buyers assess customer concentration risk, with concern typically arising when any single customer represents more than 15 to 20% of total revenue. High customer concentration creates risk if that customer reduces orders, negotiates price reductions, or terminates the relationship post-acquisition.
Buyers request customer lists showing revenue by account, contract terms, payment history, and relationship tenure. Long-term contracts with creditworthy customers reduce concentration risk; month-to-month relationships with customers who could switch suppliers easily increase it. If a top customer relationship is primarily based on the seller's personal rapport, buyers may require the seller to facilitate introductions and provide transition support as a condition of closing.
Supplier concentration is similarly evaluated, particularly when a single supplier provides critical inputs representing more than 20 to 25% of cost of goods sold or when switching costs are high. A manufacturing business dependent on a sole-source supplier for a critical component faces operational risk if that supplier raises prices, experiences production issues, or terminates the relationship after ownership changes.
Buyers verify that supplier agreements are assignable without requiring supplier consent or triggering renegotiation. If key supplier contracts contain change-of-control clauses requiring consent, buyers need confirmation that suppliers will consent before closing — or they need contingency plans for alternative sourcing.
Real estate, equipment, and asset verification
Real estate due diligence verifies property ownership, zoning compliance, building code adherence, and lease terms if the business operates from leased premises. Buyers conducting a share purchase (where they acquire the corporation owning the property) need to confirm clear title, absence of liens or encumbrances, and compliance with all municipal regulations.
Environmental due diligence includes Phase I Environmental Site Assessments for businesses with real property, particularly those in manufacturing, automotive, chemical handling, or other industries with environmental risk exposure. A Phase I assessment reviews historical land use, identifies potential contamination sources, and determines whether Phase II testing (soil and groundwater sampling) is required. Environmental liabilities can be costly to remediate and often survive ownership transfers, making this a critical area of buyer concern.
Equipment and inventory verification includes physical inspection, confirmation of ownership (no liens or encumbrances), assessment of condition and remaining useful life, and verification of inventory counts against financial records. Buyers compare equipment lists to depreciation schedules, inspect major assets for deferred maintenance, and assess whether equipment will require significant capital expenditure soon after closing.
Inventory verification involves physical counts, assessment of obsolescence or slow-moving stock, and confirmation that inventory valuation methods (FIFO, weighted average) are consistently applied and appropriate for the business. Buyers discount or exclude obsolete inventory from working capital calculations, which can create disputes if the seller's balance sheet carries old inventory at historical cost rather than net realizable value.
Timeline and typical duration of due diligence
Due diligence timelines depend on deal complexity, business size, and the number of specialized advisors involved. According to the IBBA, buyers typically have 30 to 90 days to complete their investigation after signing the LOI.
Small business transactions (under $2 million) commonly complete due diligence in 30 to 45 days when financial records are organized, legal documentation is straightforward, and no real property or environmental assessments are required. Lower middle market transactions ($5 million to $20 million) typically require 60 to 90 days, particularly when multiple locations, complex supplier relationships, or regulatory compliance reviews are involved.
Delays often result from missing or disorganized documentation, undisclosed issues discovered mid-process, or third-party dependencies (landlord consents, lender approvals, regulatory filings). Sellers who prepare comprehensive due diligence materials before marketing — organizing financial records, assembling legal documents, obtaining updated environmental assessments, and resolving known compliance gaps — reduce timeline risk and signal operational competence to buyers.
Virtual data rooms (VDRs) are the standard method for sharing due diligence materials in Canadian M&A transactions, providing secure access, audit trails, and controlled document sharing. A well-organized VDR with indexed folders for financial, legal, operational, HR, customer/supplier, and property/equipment documentation accelerates buyer review and reduces the number of follow-up information requests.
How sellers should prepare for due diligence
Sellers should prepare a comprehensive due diligence data room before going to market, organizing documents into categories (financial, legal, operational, HR, customer/supplier, property/equipment) to facilitate efficient buyer review. Preparation signals professionalism, reduces the time buyers spend searching for information, and minimizes the risk that disorganization creates doubt about the accuracy of financial representations.
Financial preparation includes assembling 3 to 5 years of financial statements, tax returns, general ledgers, accounts receivable and payable aging reports, and detailed revenue and expense breakdowns. If the business uses cash accounting for tax purposes but accrual accounting for management reporting, reconcile the differences and be prepared to explain them. If add-backs to EBITDA are significant, document them with supporting evidence (personal expense receipts, above-market compensation benchmarks, one-time event invoices).
Legal preparation includes gathering all material contracts, employment agreements, leases, loan documents, licenses, permits, insurance policies, and IP registrations. Identify any contracts with change-of-control provisions, assignment restrictions, or consent requirements, and consider approaching key counterparties for advance consent before going to market (if confidentiality permits).
Operational preparation includes documenting standard operating procedures, employee roles and responsibilities, succession plans for key personnel, and system access protocols. If the business relies on proprietary software, databases, or processes, document ownership and ensure all IP is properly assigned to the business entity being sold.
Insurance due diligence reviews current policies — general liability, property, professional liability, key person life insurance — to confirm adequate coverage and identify any material claims history. Buyers want to know whether the business has been adequately insured and whether claims history suggests operational risk (frequent workplace injuries, product liability issues, professional errors).
Due diligence findings may result in purchase price adjustments, escrow holdbacks, earnout provisions, seller indemnification requirements, or in material cases, buyer withdrawal from the transaction. Sellers who proactively address known issues, disclose them transparently, and provide complete documentation reduce the risk of post-LOI surprises that derail deals or trigger renegotiation.
This article is for informational purposes only and does not constitute financial, legal, or business advice. Every business sale is different. Before making decisions about due diligence preparation, disclosure obligations, or transaction structure, consult a qualified professional familiar with your specific situation.
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