Due Diligence Checklist: The Operational Documents a Buyer Will Ask For
When a buyer signs a letter of offer for your business, the next stage is due diligence. Their accountant and lawyer will work through a due diligence checklist covering your financials, tax, contracts, staff and assets. Most owners expect that part. What catches them out is the second list: the operational documents that show how the business actually runs, and whether it will keep running when you leave.
This guide is written for owners preparing to sell, though buyers will find it useful too. It covers the standard financial and legal items briefly, then goes deep on the operational list most checklists skip, with where to find each item and what good looks like.
Key takeaways
- Due diligence has two halves. Your accountant and lawyer lead the financial, tax and legal half. The operational half is yours.
- Most published checklists stop at financials and contracts. Buyers increasingly ask for SOPs, systems registers, account ownership and reporting history as well.
- Gaps in operational documents rarely kill a deal. They tend to show up as a longer handover, more of the price in an earn-out, or tougher terms.
- Start assembling the operational documents 6 to 12 months before you go to market, so they describe a business that already runs that way.
- Anything held in your personal name (domains, software, phone numbers, supplier accounts) should move into the business before settlement.
What due diligence is for
Due diligence is the buyer checking that the business is what you said it is. The Australian Government’s guidance for buyers suggests reviewing financial records, business operations and legal documents, including three to five years of financials, licences, leases, supplier agreements, assets and liabilities (business.gov.au, Buy an existing business).
For a seller, it is also the stage where deals slow down or get renegotiated. Every question you cannot answer quickly becomes a reason for the buyer to ask for more protection. A business that hands over a complete, organised data room looks easier to take over, because it usually is.
There is plenty of activity to prepare for. Pitcher Partners’ Dealmakers 2026 study found succession planning is the top deal driver in both the mid-market (42%) and the broader M&A landscape (32%) (Pitcher Partners, Dealmakers 2026). More owners selling means buyers can compare, and the well-documented businesses stand out.
The standard due diligence checklist (your advisers lead this)
These are the items every business due diligence process covers. Your accountant and lawyer will tell you exactly what applies to your structure and sector, so treat this as a prompt, not advice.
| Area | What buyers typically ask for | Who leads it |
|---|---|---|
| Financial | Three to five years of profit and loss, balance sheets, cash flow, management accounts, debtors and creditors, sales records | Accountant |
| Tax | Tax returns, BAS and GST lodgements, payroll tax, superannuation compliance, any ATO correspondence or payment plans | Accountant |
| Legal | Company structure, constitution, shareholder agreements, key customer and supplier contracts, leases, licences and permits, disputes | Lawyer |
| Employees | Employment contracts, award coverage, pay records, leave balances, contractor agreements, workplace health and safety records | Lawyer and accountant |
| Assets and IP | Asset register, plant and equipment condition, stock, PPSR registrations, trademarks, website and content ownership | Lawyer and accountant |
Get these moving early. Your job as the owner is to make sure the information exists and is easy to find. The rest of this guide is about the half that sits with you.
The operational due diligence checklist most guides skip
Financial due diligence tells a buyer what the business earned. Operational due diligence tells them whether they can keep earning it. Buyers test this by asking how work gets done, who knows what, and what they would actually be handed on day one.
Here is the operational list, with where each item usually lives today and what a buyer will be reassured to see.
1. SOPs and process documentation
Where to find it: Shared drives, old training notes, onboarding emails, and mostly in people’s heads.
What good looks like: Written procedures for the core processes (quoting, sales, delivery, invoicing, customer service) that staff actually use. Each one names an owner and a last-reviewed date. Buyers often ask staff how something is done and compare the answer to the document, so a folder nobody opens does not help. Our SOP template for small business is a simple place to start.
2. Org chart and role descriptions
Where to find it: Usually nowhere. Most owner-led businesses have never drawn one.
What good looks like: A current org chart showing who reports to whom, plus a one-page description for each role covering responsibilities, decisions the role can make, and the systems it uses. Be honest about the boxes that say your name. A buyer will find them anyway.
3. Systems and software register
Where to find it: Your credit card and bank statements, which show every subscription you pay for.
What good looks like: One list of every system the business runs on: what it does, monthly cost, contract terms, who administers it, and what data lives in it. Include the small tools as well as the big ones. A buyer wants to know what they are inheriting and what it costs to keep running.
4. Accounts, logins and domains ownership register
Where to find it: Your password manager, your email inbox, and domain registrar and telco accounts.
What good looks like: Every domain, website host, email platform, phone number, social media account, supplier portal and software account is registered to the business, not to you personally or to a former staff member or contractor. Admin access sits with more than one person, and there is a written plan for handing over credentials at settlement. This is one of the most common causes of settlement delays and one of the easiest to fix early.
5. Customer and supplier lists, with concentration
Where to find it: Your accounting software (revenue by customer, spend by supplier) and your CRM.
What good looks like: A customer list showing revenue per customer for the last three years, with your largest customers as a share of total revenue. A supplier list showing key suppliers, terms and any alternatives. If one customer or supplier is a large share of the business, say so and explain how the relationship is managed. Buyers will calculate it themselves, and it reads better coming from you.
6. CRM pipeline history and lead sources
Where to find it: Your CRM, if you use one consistently. Otherwise spreadsheets, inboxes and memory.
What good looks like: Pipeline history showing enquiries, quotes, conversion rates and average deal size over time, plus where leads come from (referrals, search, ads, repeat customers). This shows a buyer that revenue comes from a repeatable process, not from your personal network. If leads mostly arrive because people know you, that is something to work on before you sell.
7. Reporting history and dashboards
Where to find it: Monthly reports you send to yourself or your accountant, and any dashboards in your software.
What good looks like: A consistent set of weekly or monthly reports going back at least 12 months covering sales, cash, pipeline, jobs and the few numbers that drive your business. Ideally they are produced by the systems, not assembled by you on a Sunday night. A buyer wants to be able to see the business without having to ask you.
8. Key person documentation
Where to find it: In the heads of the two or three people the business would struggle without, including you.
What good looks like: For each key person, a record of what they know that nobody else does, which customers and suppliers they manage, and how that knowledge has been documented or shared. Include retention arrangements where relevant, which your lawyer can advise on. Our guide to key person risk when selling a business covers this in more detail.
9. Automation and AI tools in use
Where to find it: Your automation platforms, AI subscriptions, and whoever set them up.
What good looks like: A list of every automation and AI tool in use, with three answers for each: what it does, where the data goes, and who owns the account. Buyers are starting to ask these questions because a workflow built on a contractor’s personal account, or one that sends customer data somewhere nobody can explain, is a risk. A documented automation is an asset. An undocumented one is a question.
Operational due diligence checklist at a glance
| Document | Where to find it | What good looks like |
|---|---|---|
| SOPs and process docs | Shared drives, training notes, people’s heads | Core processes written, owned, dated and used by staff |
| Org chart and role descriptions | Usually needs creating | Current structure, one page per role, owner’s boxes visible |
| Systems and software register | Bank and card statements | Every system, cost, admin and data held, in one list |
| Accounts, logins and domains | Password manager, registrar, telco | All in the business’s name, shared admin, handover plan |
| Customer and supplier lists | Accounting software, CRM | Three years of revenue by customer, concentration explained |
| CRM pipeline and lead sources | CRM, spreadsheets | Conversion history and lead sources that do not depend on you |
| Reporting history | Monthly reports, dashboards | 12+ months of consistent reports produced by the systems |
| Key person documentation | Key staff and you | Knowledge and relationships recorded and shared |
| Automation and AI tools | Automation platforms, subscriptions | What each does, where data goes, who owns the account |
How to prepare these documents before you sell
Building an operational data room is not a weekend job, but it is not complicated either. A practical order:
- Start with the registers. Systems, accounts and domains are quick to list and often reveal the most urgent fixes, like a domain registered to a former web developer.
- Move ownership into the business. Transfer anything in a personal name. Some transfers take weeks, so do not leave them to settlement.
- Document the processes that would break first if you disappeared for a month. Five well-used SOPs beat fifty unused ones.
- Get reporting running automatically so you build up a history a buyer can read.
- Write down what key people know, starting with yourself.
- Keep it current. A data room assembled the week before going to market looks like what it is.
Timing matters. Documents that describe how the business has run for the past year are more convincing than ones written last month. Our 24-month plan to prepare your business for sale shows where this fits in the wider timeline.
What gaps in the operational list usually mean
Missing operational documents rarely stop a sale. They change how it is structured. In practice, gaps tend to show up as:
- A longer handover. If the knowledge is in your head, the buyer needs you there longer to get it out.
- More of the price in an earn-out. If revenue depends on relationships or processes the buyer cannot verify, they may want to pay part of it later, once results are proven.
- Tougher warranties and terms. Uncertainty gets priced into protections.
- Fewer serious buyers. Some buyers will simply move to a business that is easier to assess.
Your broker can tell you how these play out in your sector. The point is that the operational list is something you control, and it is far easier to fix before a buyer arrives than during due diligence.
FAQ
What is on a due diligence checklist for a small business?
The standard items are financial statements, tax records, legal documents, employee records and assets. A complete checklist also covers operations: SOPs, an org chart, a systems and accounts register, customer and supplier concentration, pipeline and reporting history, key person documentation, and the automation tools in use.
How long does business due diligence take?
It varies with the size and complexity of the business, commonly from a few weeks to a few months. It moves faster when the seller has the documents organised before the buyer asks. Your broker and lawyer can give you a realistic timeline for your deal.
Who prepares the due diligence documents when selling?
The seller does, with help. Your accountant prepares or reviews the financial and tax material, your lawyer handles the legal items, and your broker usually coordinates the data room. The operational documents generally fall to you and your team.
Is this the same as a buying a business checklist?
It is the same list seen from the other side. Buyers can use the operational section to ask better questions, especially about account ownership, key people and where customer data goes.
Conclusion
A due diligence checklist has two halves. Your accountant and lawyer will handle the financial and legal one. The operational half, showing how the business runs and that it can run without you, is the one buyers increasingly test and the one most owners prepare last.
If you are planning to sell in the next 6 to 24 months, find out where your gaps are first. Take the free Saleability Score to see how you rate on the six things buyers check, or see how the Buyer-Ready Program documents, automates and hands over the work that still runs through you.
