Due diligence is the structured investigation you conduct before buying a business to verify what you're actually purchasing and identify risks that could undermine your investment.
When you acquire an existing operation, you're taking on its liabilities, contracts, relationships, and reputation alongside its assets and revenue. A disciplined process separates businesses that are positioned for growth from those carrying hidden problems that will cost you time and money after settlement.
Why Financial Records Alone Don't Tell the Full Story
Financial statements show historical performance, but they don't reveal whether that performance can continue under your ownership. You need to understand what drives the revenue, how dependent it is on the current owner, and whether the cost base reflects all ongoing obligations.
Consider a buyer evaluating a regional distribution business showing consistent profit margins over three years. The financials looked sound, but a deeper review revealed that two major customers represented 68% of revenue, both on verbal agreements with the retiring owner. One of those customers had already begun discussions with a competitor. Without identifying this concentration risk during due diligence, the buyer would have paid for revenue that was likely to disappear within months of settlement.
You also need to verify that all income and expenses are properly recorded. Owner-operated businesses sometimes run personal costs through the company or exclude cash transactions from reporting. Your accountant should reconstruct normalised earnings that reflect what the business would generate under standard operating conditions, adjusting for one-off expenses, non-commercial arrangements, and any income that won't transfer with the sale.
The Legal and Compliance Layer Most Buyers Underestimate
Every business operates within a framework of contracts, licences, leases, and regulatory obligations. You need to confirm that these are current, transferable, and don't contain terms that could restrict your plans for the business.
Leases are often the most significant issue. A commercial lease with two years remaining and no option to renew gives you limited time to establish the business before facing a potential rent increase or relocation. If the lease is held personally by the vendor rather than by the company, you'll need their cooperation to assign it or negotiate a new agreement with the landlord.
Employment contracts and entitlements also transfer with the business. Verify that all employees are correctly classified, that superannuation and leave entitlements are up to date, and that no unfair dismissal or underpayment claims are pending. Any outstanding entitlements become your liability at settlement.
Intellectual property requires particular attention if it's central to the business model. Confirm that trademarks are registered in the company's name, that any proprietary systems or processes are documented and owned by the business, and that customer lists and supplier relationships can legally transfer. If the business relies on software, check the licensing terms to ensure they permit transfer or continued use under new ownership.
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Operational Due Diligence: What Happens When the Current Owner Leaves
The value of a business depends on its ability to generate profit without the current owner's direct involvement. You need to assess how much of the operation is systemised and how much depends on individual relationships or knowledge.
In our experience, service businesses are particularly vulnerable to this risk. A consulting firm might have strong revenue, but if most clients have a personal relationship with the principal and no formal processes exist for service delivery, you're buying a job rather than a business. Ask to see operations manuals, client onboarding processes, and reporting systems. If these don't exist or are incomplete, factor in the time and cost required to build them after acquisition.
Supplier relationships also need review. If the business depends on specific suppliers for inventory or materials, confirm that those supply agreements will continue under new ownership and on the same terms. A change of ownership can trigger renegotiation clauses that increase costs or reduce payment terms.
Customer concentration is another operational risk that financial statements alone won't highlight. A business that generates 40% of its revenue from a single customer or sector is exposed if that relationship changes. During due diligence, review the customer base to understand how diversified it is and whether contracts are in place to secure ongoing revenue. Developing a growth strategy to diversify revenue should be part of your post-acquisition planning if concentration risk is present.
How to Structure the Process Without Delaying the Deal
Due diligence needs to be thorough, but it also needs to be completed within the timeframe specified in the sale agreement. Most vendors will allow between 30 and 60 days for a buyer to complete their investigation, and extending that period can create uncertainty that causes deals to collapse.
Start by requesting a complete information package from the vendor, including three years of financial statements, tax returns, a list of all assets included in the sale, copies of leases and contracts, details of employees and entitlements, and a breakdown of customer and supplier relationships. This should be provided early in the process so your advisors can begin their review.
Engage your business advisory team and legal advisor at the beginning, not after you've already committed to terms. Their role is to identify issues that could affect the value or viability of the business and to recommend adjustments to the purchase price or contract terms based on what they find. If significant problems emerge, you need time to renegotiate or exit the transaction before you're locked in.
Prioritise the areas that carry the most risk for your specific situation. If you're buying a business that depends on regulatory approvals, focus on confirming that all licences are current and transferable. If the business has significant physical assets, arrange for independent valuations to confirm their condition and value. If the business operates in a competitive market, assess whether its current market positioning is sustainable and what investment will be required to maintain or improve it.
What to Do When Issues Are Identified
Due diligence will almost always reveal issues that weren't disclosed or apparent at the outset. The question is whether those issues are manageable or whether they fundamentally change the value or risk profile of the business.
Minor issues such as incomplete records, small outstanding debts, or administrative compliance gaps can usually be resolved by adjusting the purchase price or requiring the vendor to rectify them before settlement. Material issues such as undisclosed liabilities, loss of a major contract, or regulatory breaches may require significant renegotiation or could justify walking away from the transaction entirely.
If you identify a problem, document it clearly and discuss the impact with your advisors before raising it with the vendor. You need to understand whether it affects the value of the business, whether it can be fixed, and what it will cost to resolve. That analysis gives you a basis for renegotiating terms or requesting a price reduction that reflects the additional risk or cost you're taking on.
Your due diligence findings should also inform your post-acquisition plan. If the business has weak financial systems, you'll need to invest in bookkeeping and reporting processes early. If customer contracts are informal, formalising those relationships should be a priority. If the business is operationally dependent on the current owner, you'll need a transition plan that retains their involvement for a defined period while you build systems and relationships. Understanding your numbers from the first month of ownership allows you to identify whether the business is performing as expected and whether any issues missed during due diligence are starting to surface.
The sale agreement should include warranties and indemnities that protect you if undisclosed liabilities emerge after settlement. These clauses allow you to recover costs from the vendor if they've misrepresented the business or failed to disclose material information. Your legal advisor will draft these protections based on the risks identified during due diligence, but they're only effective if the vendor has the financial capacity to meet a claim.
Acquiring a business is a significant financial and operational commitment. The due diligence process exists to ensure you understand what you're buying, what risks you're accepting, and whether the business can support your growth plans. Rushing this stage or relying on incomplete information exposes you to problems that could have been identified and addressed before you committed your capital.
Call one of our team or book an appointment at a time that works for you to discuss how we can support your acquisition process with financial, operational, and strategic due diligence tailored to your specific transaction.
Frequently Asked Questions
How long does due diligence take when buying a business?
Most sale agreements allow between 30 and 60 days for due diligence. The timeframe depends on the complexity of the business, the quality of records provided, and whether significant issues are identified that require further investigation or renegotiation.
What should I check during financial due diligence?
You need to verify that financial statements are accurate, that all income and expenses are properly recorded, and that the business can continue generating the reported profit under your ownership. Your accountant should reconstruct normalised earnings by adjusting for one-off costs, personal expenses, and any revenue that won't transfer with the sale.
What happens if due diligence reveals problems with the business?
Minor issues can usually be resolved by adjusting the purchase price or requiring the vendor to fix them before settlement. Material problems such as undisclosed liabilities or loss of major contracts may require significant renegotiation or could justify exiting the transaction entirely.
Do I need a lawyer and accountant for due diligence?
Yes. Your accountant reviews financial records, tax compliance, and normalised earnings, while your lawyer examines contracts, leases, intellectual property, and regulatory compliance. Both advisors identify risks that could affect the value or viability of the business and recommend protections in the sale agreement.
What is operational due diligence?
Operational due diligence assesses whether the business can continue operating profitably without the current owner. It examines how systemised the business is, whether customer and supplier relationships will transfer, and whether the business depends on individual knowledge or relationships that may not continue after the sale.
