Due Diligence Checklist for Buying a Small Business in Australia

I've walked away from more deals than I've closed.

That's not a failure rate. That's due diligence doing its job.

Most first-time buyers treat due diligence like a box-ticking exercise. Get the financials, check the lease, scan the contracts, done. But the deals that go wrong — the ones that cost people their savings, their confidence, and sometimes their marriages — almost always had a red flag that showed up during due diligence and got ignored.

After 20+ years in private equity and corporate advisory, here's the due diligence process I actually use when buying small businesses in Australia.

Start With the End in Mind

Before you open a single spreadsheet, answer one question: what would make you walk away?

Serious buyers know their deal-breakers before they start. Mine include owner dependency with no transition plan, customer concentration above 30%, and financials that can't be reconciled within a week.

Write yours down. Put them somewhere visible. Because once you fall in love with a business — and you will — those deal-breakers are the only thing standing between you and a bad decision.

Financial Due Diligence: Follow the Cash

This is where most guides start and stop. They'll tell you to "review the financials." That's like telling someone to "check the car" before buying it.

Here's what I actually look at:

Three years of profit and loss statements. Not the ones the broker gave you. The ones from the accountant. Compare them to the BAS statements lodged with the ATO. If the numbers don't match, that's your first conversation.

Tax returns. These are the numbers the owner swore were true to the government. If the tax returns show $300,000 in revenue but the broker's information memorandum says $500,000, someone is lying. You need to work out who.

BAS statements. Quarterly Business Activity Statements are gold. They show actual GST collected — which means actual revenue. You can reconstruct a revenue timeline from BAS alone. I do this on every deal.

Bank statements. Twelve months minimum. You're looking for patterns. Seasonality. Irregular large deposits. Payments to people who don't appear on the payroll. Cash businesses especially — if the bank deposits don't support the claimed revenue, trust the bank.

Debtor and creditor ageing reports. How fast do customers pay? How fast does the business pay its suppliers? A business with $200,000 in receivables over 90 days has a collections problem. Or worse — customers who are about to dispute.

Superannuation compliance. This is critical in Australia right now. With Payday Super requirements starting July 2026, any business that has been loose with super payments is sitting on a liability. Check the super accounts match the payroll records. Check every quarter.

The Owner: Your Biggest Risk

In small business, the owner is usually the business. That's the problem.

Ask yourself: if this owner walked out tomorrow, what happens?

Customer relationships. Are they with the business or the person? In trades, this is almost always the person. The landscaper who has mowed Mrs Henderson's lawn for 15 years — Mrs Henderson doesn't care who owns the ABN. She cares about Dave.

Supplier terms. Are the good prices because of the business or because the owner plays golf with the rep? You'd be surprised how often supplier terms reset when ownership changes.

Staff loyalty. Will the key people stay? Have you spoken to them? Not in front of the owner — separately. Their body language will tell you more than their words.

Operational knowledge. Is the pricing in a system or in the owner's head? Are the job schedules documented or does the owner just know? If the answer is "the owner just knows," add 6 months and $50,000 to your transition plan.

I've seen businesses lose 30% of revenue in the first year after sale because the owner was the business. That's not a negotiation discount. That's a different business entirely.

Legal Due Diligence: The Stuff That Bites You Later

Business structure. Is this an asset sale or a share sale? In Australia, most small business acquisitions are structured as asset sales — you buy the assets and goodwill, not the company. This protects you from hidden liabilities. If a broker is pushing a share sale on a small business, ask why. There's usually a reason, and it's rarely in your favour.

Lease. For any business that operates from a physical location, the lease is make-or-break. How long is left? What are the options? Is the landlord willing to assign it to a new owner? I've seen deals collapse because the landlord wanted a 30% rent increase at assignment. Check this before you spend money on anything else.

Contracts and agreements. Client contracts, supplier agreements, employment contracts, subcontractor arrangements. Read them all. Look for change-of-control clauses — some contracts automatically terminate or allow renegotiation when ownership changes.

IP and registrations. Business name, domain name, trademarks, licences. Are they all in the business entity's name or the owner's personal name? In trades, check contractor licences. In food, check health registrations. In childcare, check ACECQA ratings. These don't automatically transfer.

Litigation history. Ask directly: has the business been involved in any legal disputes in the last five years? Then check. ASIC searches, court registry searches, SafeWork notifications. A clean answer that doesn't match the record is the biggest red flag of all.

Workers compensation claims. Request the claims history from the insurer. A pattern of claims tells you about workplace culture, not just safety. It also affects your premiums from day one.

Operational Due Diligence: How the Machine Actually Runs

This is the part most buyers skip. It's the part that matters most.

Spend a week in the business. Not looking at spreadsheets. Standing in the workshop. Sitting in the office. Riding in the trucks. You'll learn more in three days of observation than three months of document review.

Talk to customers. Not the three references the owner gives you. Those are the happy ones. Ask for a full customer list and call five at random. Ask: would you stay if the owner changed? The honest ones will tell you.

Check the assets. When was the equipment last serviced? What's the real condition of the fleet? A fleet of vehicles with 300,000km on the clock is not an asset — it's a capex obligation. Get an independent valuation on any significant plant and equipment.

Review the tech stack. What software does the business run on? Is it current? Is it transferable? A business running on a 10-year-old version of MYOB with no cloud backup is telling you something about how it's been managed.

Understand the workflow. Map the process from customer enquiry to job completion to invoice to payment. Where are the bottlenecks? Where is the waste? This isn't just due diligence — it's your operational improvement plan for year one.

The Red Flags Most Buyers Miss

After doing this enough times, patterns emerge. These are the ones that catch people:

The rush. "We need to close by end of month." Urgency almost always benefits the seller. If they're rushing, ask why. Sometimes it's genuine — a health issue, a life change. Sometimes it's because they know something you don't.

The story that doesn't match the numbers. "Business is growing strongly." But revenue has been flat for three years. Or: "We've got a great pipeline." But the pipeline isn't documented anywhere. Trust the numbers. Always.

The broker who won't let you talk to the owner. Good brokers facilitate access. Bad brokers control information. If you can't have a direct conversation with the owner, walk.

Clean books with no systems. If the financials are immaculate but there's no job management software, no CRM, no documented processes — someone has cleaned up the books for sale. The business itself is probably less organised than it appears.

High staff turnover that gets explained away. "It's just the industry" is not an answer. In trades, a business that can't keep apprentices or labourers has a culture problem. Culture problems are expensive to fix.

How Long Should Due Diligence Take?

For a small business in Australia — revenue under $5 million — budget 4 to 8 weeks for thorough due diligence. That includes:

Week 1–2: Financial review and normalisation
Week 2–3: Legal review (your solicitor handles most of this)
Week 3–4: Operational observation and customer conversations
Week 4–6: Specialist reviews if needed (environmental, licensing, equipment)
Week 6–8: Final negotiations based on findings, contract drafting

If someone tells you it can be done in two weeks, they're either selling you something or they've never bought a business.

What Due Diligence Costs

Expect to spend $15,000 to $40,000 on professional due diligence for a small business acquisition in Australia. That includes:

Accountant/financial advisor: $5,000 – $15,000 for financial review and tax structuring
Solicitor: $5,000 – $15,000 for legal review, contract drafting, and lease assignment
Specialist reports: $2,000 – $10,000 for equipment valuations, environmental assessments, or industry-specific reviews

Is that expensive? Compare it to buying a $1.2 million business that's actually worth $800,000 because you didn't check the super compliance or the lease terms.

Due diligence isn't a cost. It's the cheapest insurance you'll ever buy.

The Walk-Away Decision

Here's what nobody tells you about due diligence: the best outcome is sometimes walking away.

I've walked away from businesses where the numbers didn't add up. From owners who couldn't explain their own financials. From businesses where the key customer said they were already looking at alternatives. From deals where the lease was expiring and the landlord wouldn't commit.

Every one of those walk-aways saved me more than every completed deal has made me.

That's not cynicism. That's pattern recognition. Due diligence isn't about confirming what you hope is true. It's about finding out what actually is.

Do the work. Follow the cash. Talk to the people. And if the answer is no, trust it.

The right deal will come. It always does.