What Buyers Actually Look At in Due Diligence

Most business owners have sold one business in their life, if that. Most buyers have been through dozens of transactions. That asymmetry, in experience, in process familiarity, in knowing exactly what to look for, is never more pronounced than during due diligence.

Due diligence is the period between a buyer making an offer and a deal actually closing. The letter of intent is signed. The exclusivity clock is running. And now a buyer's team, accountants, lawyers, sometimes industry specialists, systematically examines everything you told them during the sale process to see if it's true.

This guide explains what they're actually looking for, why, and what it means for you as the seller.

What Due Diligence Is Actually For

Buyers frame due diligence as verification. That's accurate, but incomplete. There are three things a buyer is genuinely trying to accomplish.

First, they want to confirm that what you represented is true. The financials you provided in the information memorandum, the customer numbers, the contract terms, the revenue breakdown, all of it gets tested against source documents.

Second, they want to identify risks they'll need to price into the deal or walk away from. A pending legal dispute, a customer contract with a change-of-control clause, an undocumented earn-out arrangement from a previous acquisition, these are the kinds of issues that either reduce price or trigger a walkaway.

Third, and this is the one sellers most often underestimate, they want to confirm that the business can continue performing after you leave. Not just that it's profitable now, but that it will remain profitable under new ownership, without you in it.

Financial Due Diligence: What They're Really Looking For

Financial due diligence is typically the most rigorous component, and the one with the most direct impact on price. An experienced buyer or their accountant will work through your financials with a specific objective: to reconstruct your EBITDA from scratch and compare it to what you represented.

They'll request:

• Three years of financial statements, ideally audited, or at minimum externally prepared and reviewed
• Management accounts for the most recent period not yet covered by annual statements
• Aged receivables and payables schedules
• A breakdown of recurring versus one-off revenue
• Top 10 customer revenue concentration by year
• Working capital history (typically the last 12–24 months, month by month)
• Details of any related-party transactions, rent, management fees, loans to or from shareholders
• Owner salary and benefits compared to what a market-rate manager would cost

From this, they'll produce their own recast EBITDA, the adjusted, normalised earnings figure they're willing to apply a multiple to. If their number is materially lower than yours, that's where price chipping begins.

The most common financial due diligence findings that lead to price reductions:

Finding	What it signals to a buyer
Revenue includes a large one-off contract not flagged upfront	Normalised earnings are lower than represented
Receivables include aged debts unlikely to be collected	Working capital is overstated; cash conversion is weaker than it looks
Related-party rent is well below market	True operating costs are understated; EBITDA needs to be adjusted down
Owner salary is significantly above what was disclosed	Add-back was inflated; adjusted EBITDA is lower than claimed
Inconsistencies between management accounts and filed financials	Unreliable records; buyer increases risk premium or requests warranties

Commercial Due Diligence: The Business Behind the Numbers

Financial due diligence tells a buyer what the business has earned. Commercial due diligence tells them whether it will keep earning it.

This typically involves the buyer examining the competitive position of the business, independently of what you've told them. In larger transactions, they'll commission third-party market research. In smaller deals, they'll do this work themselves, sometimes including conversations with your customers (usually after an NDA, and with your knowledge and agreement).

The central questions a buyer is trying to answer:

• Why do customers buy from you? Is it relationships, price, quality, geography, inertia, or genuine differentiation?
• Will they keep buying after you leave? If the answer is "because of you personally," that's a risk the buyer will price heavily.
• Is any single customer too important? A customer representing more than 20% of revenue is a concentration risk that most buyers will flag and many will discount for. Above 30–35%, it can kill a deal entirely or require a specific remedy structure.
• Is the market growing or contracting? A business in a shrinking sector gets a lower multiple regardless of current performance.
• Is there a credible pipeline? Buyers look at what's in the sales pipeline and how it's been tracked. A well-documented CRM with conversion history is evidence of a repeatable commercial process.

The commercial component is less structured than financial due diligence, but in some ways more consequential. A buyer who loses confidence in the durability of your revenue doesn't need a specific finding to justify a price reduction, their overall picture of risk simply shifts.

Legal Due Diligence: Where Deals Quietly Die

Legal due diligence is where deals most often fall over quietly, not in a dramatic walkaway, but through a slow accumulation of issues that erode confidence and give a buyer grounds to renegotiate.

A buyer's lawyers will review:

• All material contracts, customer agreements, supplier contracts, leases, and employment contracts. They're looking for unusual termination rights, auto-renewal clauses that have or haven't been triggered, and most importantly, change-of-control clauses.
• Change-of-control provisions are the single most common legal issue in business sales. Many contracts, particularly with larger corporate customers, government clients, or institutional suppliers, include a clause allowing the counterparty to terminate if the business changes ownership. If your top three customers all have this clause and can walk the moment the deal closes, that's not a minor legal issue.
• Litigation, pending or historical. Any current legal proceedings will be identified and assessed. Historical disputes matter too, particularly if they reveal patterns of customer or supplier conflicts, employee grievances, or regulatory non-compliance.
• Intellectual property ownership. Is the IP actually owned by the entity being sold? Brand, software, patents, trademarks, all of it needs to be in the right place. IP developed outside the company, owned personally, or shared with a related entity is a common issue in owner-managed businesses.
• Regulatory compliance. Licences, registrations, certifications, are they current? Are any of them non-transferable or personally held?
• Any existing vendor finance or earn-out obligations from prior acquisitions or arrangements the business has entered into.

Operational Due Diligence: Can the Business Run Without You?

Operational due diligence is often the most personally confronting for sellers, because it asks a blunt question: if you weren't there, would this business keep functioning at the same level?

For most owner-managed businesses, the honest answer is "not immediately." The question is how significant the gap is, and whether there's a credible plan to bridge it.

Buyers look at:

Process documentation

Are there written procedures for how key tasks get done, quoting, onboarding, delivery, invoicing, escalations? A business where the process exists only in the owner's head is a higher-risk acquisition than one with documented systems, even imperfect ones. Buyers know they can train to a process. They can't train to tribal knowledge that leaves with the founder.

Management depth

Is there a second-in-command? Someone who could run the business for three to six months if you weren't there? A genuine management layer, with authority, accountability, and a track record of operating independently, is one of the most value-accretive things an owner can build before a sale. Its absence is one of the most common reasons for a discounted multiple. In professional services businesses, this dynamic is even more pronounced, clients often follow the person, not the firm, which makes management depth a primary valuation driver.

Key person dependencies beyond the owner

If a single salesperson generates 60% of new business, or a single technical lead is the only person who can service your largest accounts, buyers will identify this. They'll want to know what employment arrangements are in place, whether those people are aware of the sale, and whether retention arrangements have been considered.

Staff tenure and turnover

High turnover in key roles tells a story. Buyers will look at tenure across the team and ask about any departures in the 12 months prior to sale. Unusual attrition, particularly among senior or customer-facing staff, raises questions about culture, compensation, or management instability that go beyond the immediate transaction.

Systems and technology

What platforms is the business running on? Are they properly licensed, documented, and transferable? A business running on out-of-date or personally licensed software, or on systems built by a contractor who's no longer engaged, creates transition risk that buyers will factor in.

How to Prepare for Due Diligence

The single best thing you can do is build your data room before you need it. Not when a buyer arrives with a due diligence checklist and a 30-day exclusivity window, but six to twelve months before you intend to go to market. This preparation runs in parallel with setting up your confidentiality processes, the two go hand in hand, because controlling who gets access to your data room is one of the most effective ways to keep a sale quiet.

A complete data room typically includes:

• Three years of financial statements (and management accounts for the current year)
• All material contracts, customers, suppliers, leases, employment
• HR records, employment agreements, incentive arrangements, any grievances or disputes
• IP registrations, trademarks, domain names, software licences
• Any historical litigation or regulatory correspondence
• Corporate documents, constitution, shareholder agreements, any existing encumbrances

Beyond assembling the documents, the preparation work that makes the most difference:

Clean up related-party transactions. If you're paying rent to a related entity, or receiving management fees from a related entity, or have loans outstanding to shareholders, get these documented properly and understand how a buyer will treat them in their recast. Surprises here are avoidable.

Know your customer concentration numbers. Before a buyer tells you that 35% of your revenue sits with one customer, you should already know it, and have a considered view on why it's not the risk it appears, or a plan for how it's being diversified.

Document your processes. You don't need a full ISO-certified procedures manual. You need enough documentation that a competent person could take over your key workflows and execute them without you. Start with the highest-risk, highest-value processes and work from there.

Fix what's fixable before you start. An undisclosed legal dispute, a lapsed IP registration, a key contract that's technically expired and running on goodwill, these are all fixable, but they take time. Identify them early and resolve them before they surface in due diligence as findings.

What Happens When Something Goes Wrong

A due diligence finding doesn't automatically kill a deal. Most experienced buyers expect to find something, the question is how material it is, whether it was disclosed, and whether there's a structure that can accommodate it.

The typical outcomes when something surfaces:

Price reduction. The most common outcome for a financial finding. If the buyer's recast EBITDA is $50k lower than yours, and you agreed a 3× multiple, the buyer will ask for $150k off the purchase price. This is negotiable, but buyers have leverage at this stage, they've spent money on due diligence, you've spent time, and the exclusivity clock is often expiring.

Earnout or deferred payment. Where there's uncertainty about a specific risk, a key customer contract that expires in 18 months, or a revenue stream that depends on a relationship the buyer isn't sure will transfer, a buyer may propose that a portion of the purchase price is contingent on that risk not materialising. This shifts risk back to the seller and reduces the upfront payment.

Warranty or indemnity. A buyer who has found a legal or tax exposure they can't fully quantify will typically seek a warranty (you represent that the issue doesn't exist or has been resolved) or an indemnity (you agree to cover any loss if it does materialise, up to a specified amount). These are contractual protections rather than price adjustments, but they have real value and real risk. They also interact with deal structure: in a share sale, warranty and indemnity insurance can directly address many of the risks a buyer uncovers, which is one reason understanding asset sale versus share sale dynamics matters well before due diligence begins.

Walkaway. Reserved for material misrepresentations, undisclosed deal-breakers, or a finding that changes the fundamental economics of the transaction. In practice, walkaways at due diligence stage are less common than they're feared to be, both sides have invested in getting here, and most parties would rather restructure than abandon.

The sellers who navigate due diligence best are the ones who had no surprises, either because there was nothing to find, or because they disclosed issues early and came with a considered position on each one. The worst outcome is being discovered. The best outcome is being prepared.