How Business Due Diligence Works in Australia: A Buyer's Checklist

You've found a business you want to buy. The numbers look right, the industry suits you, and the seller seems motivated. Now comes the part that determines whether this deal is a sound investment or an expensive mistake.

Due diligence is where the real work begins.

For many buyers, this stage is the most stressful part of acquiring a business. You're being asked to evaluate years of financial history, legal agreements, staff arrangements, and operational dependencies — often within a tight timeframe, while the seller is watching closely and your own excitement is pulling you toward yes.

This guide walks you through exactly how business due diligence works in Australia, what documents to request, what financial red flags to look for, and how a broker helps you manage the process without losing the deal or your nerve.

What Due Diligence Actually Means

Due diligence is the formal process of verifying everything a seller has told you before you commit to buying their business. It's your legal and commercial right as a buyer, and it's also your primary protection.

In Australia, due diligence typically follows the signing of a heads of agreement or letter of intent. At that point, the seller grants you access to confidential information — usually through a data room or staged document release — so you can verify the business's financial position, legal standing, operational health, and future viability.

The goal isn't to find reasons to walk away. It's to buy with your eyes open.

When Does Due Diligence Begin?

Due diligence formally begins after both parties have agreed on a price and key terms in principle. Before that point, you'll have received an information memorandum and possibly some high-level financials, but the detailed review comes later.

Most Australian SME transactions follow this sequence:

1. Initial enquiry and NDA signing
2. Review of information memorandum
3. Preliminary meetings with the seller
4. Heads of agreement signed
5. Due diligence period commences (typically 14 to 45 days)
6. Final negotiations and contract execution
7. Settlement

The due diligence period is usually defined in the heads of agreement. Missing that window or requesting an extension can affect your negotiating position, so it pays to be organised from day one.

The Due Diligence Checklist: What to Review

This is not a light exercise. A thorough SME due diligence process covers six core areas.

Financial Records

This is the foundation of any business acquisition due diligence. You need to verify that the numbers you've been shown are accurate and sustainable.

Request at minimum:

• Profit and loss statements for the last three financial years (2024, 2025, 2026 where available)
• Balance sheets for the same period
• Business Activity Statements (BAS) for the last two years
• Tax returns lodged with the ATO
• Management accounts for the current financial year to date
• A breakdown of the seller's discretionary earnings (SDE) or EBITDA add-backs
• Aged receivables and payables reports
• Bank statements for the last 12 months

The BAS statements are particularly important. They're lodged with the ATO and are harder to manipulate than internal accounts. Comparing BAS figures to the profit and loss is one of the fastest ways to spot discrepancies.

Legal and Compliance Documents

Financial performance means nothing if the business is sitting on unresolved legal exposure.

Request:

• Business registration and ABN/ACN details
• Any current or pending litigation
• Regulatory licences and permits (and confirmation they're transferable)
• Franchise agreements, if applicable
• Intellectual property registrations (trademarks, patents, domain ownership)
• Insurance policies currently in force
• Any ATO correspondence or payment arrangements

Check whether licences are held in the seller's personal name or the business entity. If they're personal, they may not transfer automatically.

Operations and Staff

A business can look profitable on paper and still be entirely dependent on one person or one relationship. This section is about understanding what you're actually buying.

Review:

• Organisational chart and key staff roles
• Employment contracts and any contractor agreements
• Current award classifications and pay rates
• Outstanding leave entitlements (annual leave, long service leave)
• Any WorkCover claims history
• Staff tenure and likely retention post-sale
• Documented systems and operating procedures

Long service leave liabilities in particular can be significant in businesses with long-tenured staff. These are often negotiated into the purchase price or settlement terms.

Customers, Contracts, and Revenue Concentration

One of the most common risks in SME acquisitions is revenue concentration — where a large portion of income comes from one or two customers. If those customers leave after the sale, the business you bought looks very different from the business you evaluated.

Ask for:

• A breakdown of revenue by customer for the last two to three years
• Copies of key customer contracts and their expiry dates
• Supplier agreements and any exclusivity arrangements
• Evidence of customer retention rates over time

If more than 20 to 25 percent of revenue comes from a single customer, that's a risk worth pricing into your offer or addressing in the contract through earn-out provisions.

Assets and Liabilities

You need a clear picture of what's included in the sale and what condition it's in.

Verify:

• A full asset register (plant, equipment, vehicles, fit-out)
• Condition and age of key assets
• Any assets subject to finance or chattel mortgage
• Inventory levels and valuation method
• Outstanding debts, loans, or director guarantees
• Lease terms and any make-good obligations

Assets listed on the balance sheet at book value may be worth significantly less in practice. A physical inspection and, where warranted, an independent valuation is worth the cost.

Commercial Property (If Applicable)

If the business operates from leased premises, the lease is often as important as the business itself. If the property is included in the sale, the due diligence scope expands considerably.

For leased premises:

• Current lease terms, rent, and remaining tenure
• Landlord consent requirements for assignment
• Any rent reviews scheduled during the lease term
• Make-good clauses and their estimated cost

For freehold property:

• Title search and encumbrances
• Zoning and permitted use
• Building and pest inspection reports
• Strata records (if applicable)

At Everest Commercial Property & Business Brokers, we handle both business and property due diligence in an integrated way — which matters when you're acquiring a business that comes with a commercial tenancy or property component. You can explore our buying support services at everestcpbb.com.au.

Financial Red Flags to Watch For

Even with a complete set of documents, the risk is in knowing what to look for. These are the patterns that warrant a closer look or a direct conversation with the seller.

Revenue spikes in the final year before sale. A sudden jump in revenue in the 12 months immediately before listing can indicate the seller has pulled forward sales, taken on unprofitable work to inflate turnover, or made one-off changes that won't repeat.

Add-backs that don't hold up. Sellers often adjust EBITDA by adding back personal expenses, one-off costs, or owner salaries above market rate. Some of these are legitimate. Others are not. Scrutinise every add-back individually.

BAS figures that don't match the P&L. GST-registered businesses report turnover through their BAS. If the BAS numbers are materially lower than the profit and loss statements, something doesn't reconcile.

Deteriorating debtor days. If customers are taking longer and longer to pay, it may indicate the business is struggling to collect, or that key customer relationships are weakening.

High staff turnover. Payroll records often tell a story the seller doesn't volunteer. Frequent turnover in key roles is a signal worth investigating.

Lease expiry close to settlement. A lease expiring within 12 months of the sale, with no renewal secured, is a material risk that affects the business's continuity and its value.

How Long Does Due Diligence Take?

For most Australian SME transactions in the $300,000 to $5 million range, due diligence takes between two and six weeks. The timeline depends on:

• How quickly the seller provides documents
• The complexity of the business (staff, contracts, multi-site operations)
• Whether property is included
• The responsiveness of your advisors (accountant, solicitor, broker)

Rushing due diligence to preserve a deal is one of the most common mistakes buyers make. If a seller is pressuring you to shorten the period without good reason, that pressure itself is worth noting.

Extensions are possible, but they need to be negotiated in good faith. A good broker manages this dynamic so the deal doesn't collapse over process friction.

How a Business Broker Helps Manage the Process

Due diligence is not something you should navigate alone, particularly if this is your first acquisition.

A specialist broker brings three things to this stage of the process. First, they know what a complete document set looks like and will push the seller's side to provide it. Second, they can read financial models and operational structures critically, flagging issues before you've committed further. Third, they manage the relationship between buyer and seller so that difficult conversations about discrepancies or renegotiation don't derail the deal.

At Everest CPBB, our buying support includes financial modelling, due diligence coordination, and legal documentation support. For investment migrants navigating an Australian acquisition for the first time, we also provide bilingual support and cross-border context that generic brokers can't offer.

If you're evaluating a business purchase in 2026, visit everestcpbb.com.au to learn how we work with buyers through every stage of the process.

FAQs

What is business due diligence in Australia?
Business due diligence is the process a buyer undertakes to verify the financial, legal, operational, and commercial details of a business before completing a purchase. In Australia, it typically occurs after a heads of agreement is signed and before the final sale contract is executed.

What documents should I request during due diligence when buying a business?
At a minimum, you should request three years of profit and loss statements, balance sheets, BAS statements, ATO tax returns, bank statements, employment contracts, key customer and supplier agreements, asset registers, and all relevant licences and permits.

How long does due diligence take when buying a business in Australia?
For SME transactions valued between $300,000 and $5 million, due diligence typically takes two to six weeks. More complex businesses, or those that include commercial property, may require longer.

What financial red flags should I look for when buying a business?
Key red flags include revenue spikes in the year before sale, BAS figures that don't match profit and loss statements, unsupported EBITDA add-backs, deteriorating debtor days, high staff turnover, and leases expiring shortly after settlement.

Do I need a business broker to help with due diligence?
You're not legally required to use a broker, but an experienced broker adds real value during due diligence. They know what a complete document set looks like, can identify financial and operational risks, and manage the buyer-seller relationship so the process doesn't collapse over friction.

What happens if due diligence reveals problems?
If due diligence uncovers material issues, you have several options: renegotiate the price, request that the seller address the issue before settlement, structure an earn-out to manage the risk, or withdraw from the deal. Your heads of agreement should include a due diligence condition that protects your deposit if you withdraw on legitimate grounds.

How is due diligence different when buying a business with commercial property?
When property is included, due diligence expands to cover title searches, zoning, building and pest inspections, strata records, and any encumbrances on the title. The timeline is typically longer, and you'll need both a business advisor and a property specialist involved.

Conclusion

Due diligence is the most important work you'll do before buying a business. Done properly, it confirms your investment thesis, surfaces risks you can price or manage, and gives you the information you need to negotiate from a position of knowledge rather than assumption.

The checklist above covers the core areas, but the process is only as good as the people helping you run it. Work with advisors who know what complete looks like, and don't let timeline pressure push you into signing off on an incomplete review.

If you're preparing to buy a business in Australia and want experienced support through due diligence and beyond, learn more at everestcpbb.com.au.