The due diligence phase is where deals are made – and where many fall apart. With the right checklist and a clear process, you can investigate a business properly before committing serious time and money.
For many buyers, this is also the most nerve-wracking part of the acquisition journey. By the time you reach due diligence, you may already be picturing what life could look like as the new owner. Perhaps you’re imagining the freedom of running your own company, or the financial upside if the business continues to grow.
But due diligence is where excitement meets reality. Are the financials accurate? Are the customers stable? Are there risks hidden in contracts, tax filings or operations? If the answers hold up, you move forward with confidence. If they don’t, walking away may be the smartest move you make.
In this guide we strip away the jargon and walk through a practical twelve-step due diligence checklist for entrepreneurs and investors evaluating a business acquisition in Canada.
Let’s get started.
Due Diligence Checklist for Buying a Business in Canada
Before diving into each step, here’s the condensed twelve-step checklist at a glance. Many buyers find it helpful to copy this into a working document and tick off each item as they progress through the investigation.
At first glance, the list can look intimidating. That’s completely normal. Buying a business involves a lot of moving parts, and due diligence is the stage where you examine them one by one.
The good news is that not every item will apply to every deal. A small service company will have different risks from a manufacturing operation, and a single-location business will require less investigation than a multi-site one. Still, it helps to be aware of each step.
- Set-Up: timeline, document request list, advisory team, confidentiality agreements
- Financial Due Diligence: financial statements, tax returns, revenue verification, AR/AP review, working capital
- Inventory: stock reports, saleable inventory, independent counts
- Assets & Equipment: asset register, ownership vs leases, maintenance history
- Sales: revenue sources, pricing structure, customer concentration, CRM systems
- Marketing: marketing strategy, channels, brand positioning, digital presence
- People / HR: employee roles, compensation, payroll compliance, benefits
- Systems & Operations: accounting software, processes, IT access, internal controls
- Customers, Suppliers & Competition: market analysis, supplier dependence, customer relationships
- Contracts & Legal: leases, contracts, licences, regulatory compliance
- Pro Forma: acquisition financial model and break-even forecast
- Decision & Renegotiation: price adjustments, risk mitigation, closing strategy
Once you begin working through these steps, the process becomes far less overwhelming. Each one simply represents another piece of the puzzle.
Step One: Set-Up
Before reviewing documents in detail, you need to establish a clear structure for the due diligence process.
Agree on a realistic timeline with the seller. For many small business acquisitions around 20 business days is typical, although more complex deals may take longer. You should also create a document request list outlining exactly what information you need. This typically includes financial statements, tax filings, contracts, payroll information and customer reports.
Most buyers assemble a small advisory team at this stage. An accountant can review the financial records, while a lawyer with experience in business acquisitions can help examine contracts and legal risks. Some buyers also bring in a trusted partner or colleague to help with tasks like inventory counts.
Tip: Our article Do You Need an Accountant or Lawyer When Buying a Business? offers practical advice on assembling the right advisory team.
Confidentiality is another important consideration. Sellers may want to limit who knows the business is for sale, particularly employees or customers. Make sure you understand what access you’ll have and who you’re allowed to speak to during the process. If the seller restricts access too heavily, it’s worth asking why.
Step Two: Financial Due Diligence
Your goal here is straightforward: confirm that the financial performance used to value the business is accurate.
At minimum, request three years of financial statements and business tax returns. In Canada, this usually means reviewing financial statements alongside corporate tax filings submitted to the Canada Revenue Agency (CRA). You should also review GST/HST filings and payroll deductions where applicable.
A common technique during financial due diligence is sampling and tracing. Sampling means selecting a spread of invoices across different months, rather than auditing every transaction. Tracing means following the path from invoice to payment to bank deposit to confirm that the revenue actually occurred.
Consistency is what you’re looking for. Sudden margin swings, unusual one-off transactions or unexplained cost changes should always be investigated.
Your financial due diligence checklist should include:
- Owner add-backs – confirm that personal expenses added back to profit are legitimate.
- Accounts receivable (AR) – unpaid invoices and average collection times.
- Accounts payable (AP) – supplier balances and payment patterns.
- Debt and credit facilities – loan terms, interest rates and lender covenants.
Tip: Our article Financial Due Diligence: What Every Business Buyer Needs to Know delves into this part of the process in more detail.
Step Three: Inventory Due Diligence
If the business sells physical products, inventory will play an important role in the valuation.
This is also one of the areas where buyers occasionally get unpleasant surprises. A balance sheet might show a large amount of inventory, but once you inspect it you may discover that much of it has been sitting on shelves for years.
Request a detailed inventory report and identify which items qualify as good and saleable stock. Obsolete, damaged or slow-moving items may have little real value.
Whenever possible, conduct an independent inventory count rather than relying solely on the seller’s records. It can feel slightly awkward at first – especially if the owner offers to help – but it’s important that you see the inventory yourself.
The counted inventory should broadly match what appears on the balance sheet. If major discrepancies appear, the purchase price may need to be adjusted.
Step Four: Assets & Equipment
Many businesses rely heavily on physical equipment, vehicles or machinery. Understanding the condition and ownership of these assets is essential.
Create an asset register listing the key items used in operations. Confirm whether each asset is owned outright or financed through a lease or equipment loan.
Review maintenance history, warranties and the expected remaining lifespan of critical equipment. Estimating replacement costs is equally important, since unexpected equipment failures soon after the acquisition can quickly drain working capital.
Step Five: Sales Due Diligence
Understanding how the business actually generates revenue is critical. Where do the leads come from? Are customers mainly repeat buyers, referrals, or one-time purchasers? How visible is the sales pipeline? You should also review pricing policies, discounting practices and the systems used to track prospects and customers, such as CRM software.
Customer concentration deserves special attention. If a large portion of revenue depends on a handful of clients or salespeople, the business could be vulnerable after a change in ownership.
At the same time, this step often reveals opportunities for growth – new markets, additional product lines or improvements to the sales process.
Step Six: Marketing Due Diligence
Marketing due diligence focuses on how the business attracts and retains customers. Evaluate the company’s marketing channels, brand positioning and digital presence.
Many small businesses have outdated websites, limited social media activity or little data tracking around their campaigns. A positive sign is a structured marketing plan with defined budgets and measurable goals.
Tip: For an example of how improving marketing can transform a business after acquisition, read How to Run (and Sell) a Family Business: A Canadian Success Story
Step Seven: Staff and HR
Employees are often one of the most valuable – and delicate – parts of a business acquisition.
During due diligence you should review employee roles, compensation structures, employment agreements and payroll practices. In Canada, this also means ensuring the business is complying with provincial employment standards and payroll deduction requirements.
You should also identify key staff whose departure could significantly disrupt the business after the transition.
Step Eight: Systems and Operations
A strong business should not rely entirely on the owner’s personal knowledge to function.
Review the systems and operational processes that keep the company running day to day. Businesses with documented procedures and clear reporting systems are much easier to transition to new ownership.
Look at the accounting software, operational workflows and internal reporting structure. You should also confirm who has access to important systems such as banking platforms, websites and administrative accounts.
Tip: For a closer look at why owner-independent systems make businesses easier to sell, read The Real Secret to Selling Your Business? Make Yourself Redundant
Step Nine: Customers, Suppliers and Competition
External relationships can have just as much impact on your success as internal operations. You should research competitors within the same industry and geographic region. Compare pricing, positioning and customer reviews to understand how the business fits within the market.
You should also review supplier relationships carefully. Over-reliance on a single supplier can create operational risk if that relationship changes.
Finally, examine the customer base in detail. Understanding who buys from the business – and why – will help you evaluate both risk and long-term growth potential.
Step Ten: Contracts and Legal Due Diligence
Legal due diligence is one area where professional advice is particularly valuable. An experienced business lawyer can spot risks hidden in contracts that buyers often miss.
Your legal due diligence checklist should include:
- Leases – assignment clauses, renewal options and occupancy costs.
- Insurance – required coverage and replacement costs.
- Contracts – supplier, customer and employee agreements.
- Licences and permits – regulatory approvals required for the industry.
- Corporate records – incorporation documents and shareholder registers.
- Litigation and compliance – lawsuits, regulatory issues or environmental concerns.
You should also verify that the company’s filings with the appropriate provincial or federal corporate registry are up to date.
Step Eleven: Build a Conservative Pro Forma
A pro forma is a forward-looking financial projection showing how the business may perform after the acquisition.
Start with a conservative revenue estimate and subtract Cost of Goods Sold (COGS) to determine gross profit. From there, subtract operating expenses, acquisition financing payments, professional fees, capital expenditure allowances and your own salary. The result is a projected net profit.
A good pro forma should also account for seasonality and help you determine the company’s break-even point. Most importantly, it should stress-test downside scenarios rather than relying on overly optimistic assumptions.
Step Twelve: Decision & Renegotiation
Congratulations! If you’ve made it this far, you’re almost done. Once the due diligence phase is complete, negotiations begin in earnest.
The information you’ve uncovered becomes the foundation for price adjustments or deal restructuring. Buyers often use mechanisms such as escrow agreements, seller financing or earn-outs to reduce risk.
Tip: For a deeper dive into negotiation strategy, read our article How to Negotiate When Buying a Business.
Even after investing time and effort in due diligence, the most important skill for any buyer is the ability to walk away.
Buying the wrong business can cost far more time and money than abandoning a deal after careful investigation. And if you do walk away, remember - there’s over 58,000 more businesses for sale on BusinessesForSale.com!