The Due Diligence Checklist: What Buyers Will Ask For When You Sell Your Business

Most owners prepare hard for the part of a sale that happens before an offer, and barely at all for the part that happens after one. That is backwards. By the time a buyer signs a letter of intent, the hard work of finding them is done — and the phase that follows is where a surprising number of deals fall apart, get repriced, or grind on so long that one side loses the will to finish.

That phase is due diligence. This guide sets out what buyers ask for, category by category, what they are actually trying to establish behind each request, and which issues most often cause trouble. If you are a year or more from selling, it doubles as a preparation list: almost everything below can be sorted out in advance, and it is far cheaper to fix a problem before a buyer finds it than after.

What is due diligence?

Due diligence is the buyer's investigation of your business. Having agreed a price and signed a letter of intent, they now verify that the business is what you represented it to be — that the earnings are real, that the assets exist, that the contracts are valid, and that there are no liabilities waiting behind them.

It is document-heavy, sometimes intrusive, and entirely normal. A buyer committing significant capital, often with a lender behind them, will look closely at everything. Their advisors — accountants, attorneys, sometimes a quality-of-earnings firm — are paid to find problems. That is not hostility; it is the job.

When does due diligence happen?

After a letter of intent is signed and, in most cases, during a period of exclusivity in which you agree not to negotiate with other buyers. That exclusivity is the point at which the balance of leverage shifts. Before it, you have a market and competing interest. After it, you have one buyer, a signed LOI, and a growing personal investment in getting the deal done.

Understanding that shift is the single most useful thing in this guide. It is why problems discovered in diligence are so expensive: the buyer knows you have taken the business off the market, and a request to adjust the price at that stage is very hard to refuse. Every issue you resolve before going to market is an issue that cannot be used to renegotiate later.

What are buyers really trying to find out?

Behind every document request sit four questions. Knowing them makes the whole process easier to navigate, because you can anticipate what a request is really about.

• Are the earnings real? Do the financial statements reconcile to the tax returns and the bank statements, and can every add-back be evidenced rather than asserted?

• Will the earnings continue without you? How much of the business depends on your relationships, your knowledge, and your presence — and what happens on the day you stop turning up?

• What am I inheriting that I cannot see? Pending litigation, tax exposure, employee claims, environmental issues, warranty obligations, deferred maintenance.

• Can I actually take ownership of what I am buying? Are the contracts assignable, the licences transferable, the lease renewable, the intellectual property properly owned?

That last one catches more owners than any of the others, and it is worth checking early. A business can be excellent in every respect and still be difficult to transfer, and the time to discover that is long before a buyer's attorney does.

The due diligence checklist

What follows is the request list a well-advised buyer will work through. Not every item applies to every business, and industry-specific requirements will add to it — but if you can produce most of this on request, you are in good shape.

Financial records

• Profit and loss statements, generally three years plus year-to-date

• Balance sheets for the same periods

• Cash flow statements

• Monthly or quarterly financials, so trends and seasonality are visible

• General ledger and chart of accounts

• Accounts receivable ageing, with any known collection problems flagged

• Accounts payable ageing

• Bank statements for the period under review

• A schedule of add-backs with supporting documentation for each one

• Detail of owner compensation, benefits, and any personal expenses run through the business

• Inventory records, including the valuation method and any obsolete or slow-moving stock

• Fixed asset register with depreciation schedules

• Debt schedule — loans, lines of credit, equipment finance, terms, and any personal guarantees

• Related-party transactions of any kind

Tax

• Federal business tax returns, generally three years

• State and local returns

• Sales and use tax filings, and any nexus analysis if you sell across state lines

• Payroll tax filings

• Property tax statements

• Any open audits, disputes, assessments, or liens

• Entity formation and structure documentation

Corporate and legal

• Articles of incorporation or organization, and any amendments

• Bylaws or operating agreement

• Ownership records, share or membership certificates, and the full cap table

• Board and shareholder or member minutes

• Any buy-sell agreement between owners

• Prior financing or investment documents

• Pending, threatened, or recently settled litigation

• Any regulatory actions, notices, or consent orders

Customers and revenue

• Revenue broken out by customer, so concentration is visible

• Customer contracts and master service agreements

• Assignment and change-of-control provisions in those contracts — see the note below, this one matters

• Backlog, work in progress, and pipeline

• Customer retention history and any recent losses

• Pricing structures, discount practices, and rebate arrangements

• Warranty obligations, returns history, and outstanding claims

Suppliers and vendors

• Key supplier list with terms and payment history

• Supply agreements, including exclusivity and change-of-control provisions

• Supplier concentration and any single-source dependencies

• Outstanding purchase commitments

Employees and human resources

• Employee roster with role, tenure, compensation, and full-time or part-time status

• Employment agreements, offer letters, and any severance commitments

• Non-compete, non-solicitation, and confidentiality agreements

• Independent contractor agreements, together with the basis for classifying them as contractors

• Benefit plans, retirement plans, and their funding status

• Accrued paid time off and any other employee liabilities

• Employee handbook and written policies

• Workers' compensation history and experience rating

• Any current or historic employment claims

• Collective bargaining agreements where applicable

Assets, equipment, and facilities

• Fixed asset list with age and condition

• Maintenance records and service histories

• Equipment leases, and whether they transfer

• Vehicle titles and registrations

• Known deferred maintenance or capital expenditure that is coming due

Real estate and leases

• Lease agreements for every location

• Assignment provisions and whether landlord consent is required

• Renewal options, rent escalations, and remaining term

• If the property is owned: title, survey, mortgage documents, and any recent appraisal

• Environmental reports where the use or the history warrants one

Insurance

• Current policies — general liability, property, auto, professional or errors and omissions, cyber, key person

• Loss runs and claims history

• Certificates of insurance and any coverage required by customer contracts

Licenses, permits, and compliance

• Business licenses at every level of government

• Professional or industry licenses — and, critically, whether they transfer with the business or attach to an individual

• Operating permits

• Industry-specific compliance records, inspections, and certifications

• Safety and environmental records where applicable

Technology, data, and intellectual property

• Inventory of systems and software, with licence terms and transferability

• Domain names, websites, and social media accounts, and confirmation that the business owns them rather than a former employee or agency

• Trademarks, patents, and copyrights, with registration status

• Confirmation that work produced by contractors was properly assigned to the business

• Trade secrets and how they are protected

• Data security practices, any breach history, and customer data handling

Operations

• Organizational chart

• Documented procedures and operating manuals

• Capacity, utilization, and any constraints on growth

• Quality certifications and audit results

• The key operating metrics management actually runs the business on

What most often goes wrong

Diligence problems are rarely exotic. The same handful of issues account for most of the trouble, and every one of them can be addressed in advance.

Add-backs that cannot be documented

This is the most common and the most expensive. Add-backs asserted verbally get removed, and because value is a multiple of earnings, every dollar removed costs several dollars of price — at the precise moment you have the least leverage to argue. Build the documentation as you go, not when a buyer asks.

Financials that do not reconcile to the tax returns

When the statements and the returns tell different stories, a buyer stops taking either at face value. The specific discrepancy is often innocent. The doubt it creates about everything else is not.

Contracts that do not transfer

Many customer and supplier agreements contain change-of-control or anti-assignment clauses requiring consent before they move to a new owner. If your largest customer can walk away on a change of ownership, a buyer will discover it and price it in. Knowing which contracts carry these provisions before you go to market lets you plan around them instead of being ambushed.

Contractor classification

Long-standing workers treated as independent contractors are a recurring finding, and the potential exposure for back taxes and penalties transfers with the business. Buyers and their lenders take it seriously.

Licences that attach to a person rather than the company

In regulated trades and professional services, the licence that permits the business to operate may sit with you personally. If the buyer cannot obtain or transfer it, the transaction structure has to change — sometimes fundamentally.

Undisclosed problems

Litigation, a tax dispute, a lost major customer, a lease the landlord will not extend. Buyers can usually work around a known problem. What ends deals is discovering a problem that should have been disclosed, because it changes the buyer's view of everything else they have been told.

The business slipping during the process

Selling is a second job, and owners who let performance drift while managing the transaction hand the buyer a legitimate reason to revisit the price. Delegating the process work is one of the reasons to have an advisor running it.

Slow responses

Every week spent locating a document is a week in which enthusiasm cools, financing conditions change, and someone's circumstances shift. Momentum is a real asset in a transaction, and preparation is what protects it.

How do you prepare before going to market?

The most effective thing an owner can do is run diligence on themselves first — assemble the list above as though a buyer had requested it, and see what is missing, inconsistent, or awkward to explain.

That exercise produces two things. A complete set of materials, so that when a buyer does ask you respond in days rather than weeks. And, more valuably, an early list of the problems a buyer would have found — at a stage where you still have time and leverage to deal with them. A contract renegotiated, a classification corrected, or a dispute settled before you go to market is a non-event. The same issue found under exclusivity is a price adjustment.

It also tends to reveal how much of the business lives in the owner's head. Owners who go through this often find that the documentation gap is itself the finding — and that closing it is one of the more reliable ways to raise what the business is worth.

What is a data room?

A virtual data room is a secure online repository holding your diligence materials, with controlled access and a record of who viewed what and when. It has become the standard way to run this phase, and it is worth using even for smaller transactions.

Beyond convenience, it does two useful things. It lets you release information in stages, so that the most sensitive material — customer names, detailed pricing, employee compensation — is only opened to a buyer who has proved they are serious and properly funded. And it produces a record of exactly what was disclosed, which protects you after closing if anyone later claims something was not shared.

How do you keep it confidential?

Diligence is the phase where confidentiality is hardest to hold. The requests get more specific, more people become involved, and at some point a buyer will want to meet key staff or visit the premises. Handled carelessly, this is how employees, customers, and competitors find out before you are ready.

Several things help. A signed non-disclosure agreement before any meaningful information changes hands, and buyer screening before that. Staging the release so sensitive material comes last. Scheduling site visits outside working hours or framing them plausibly. Deciding deliberately, and in advance, which employees need to know and when — usually a small number, brought in under their own confidentiality agreements once the deal is reasonably certain.

Running the process through an advisor helps here too, simply because the questions arrive through a third party rather than from someone your staff can see visiting.

Frequently asked questions

What is due diligence when selling a business?

It is the buyer's verification process, carried out after a letter of intent is signed. They examine financial records, tax returns, contracts, legal documents, employee arrangements, assets, licences and compliance to confirm the business is what was represented — and to identify any liabilities they would be taking on.

What documents will a buyer ask for?

At minimum: three years of financial statements and business tax returns, a current balance sheet, a documented schedule of add-backs, revenue broken out by customer, customer and supplier contracts, an employee roster with compensation, leases, equipment and asset lists, insurance policies, licences and permits, and any litigation history. Industry-specific requirements add to this.

How can I prepare for due diligence?

Assemble the full request list before you go to market and review it as a buyer would. Make sure your financial statements reconcile to your tax returns, that every add-back has supporting documentation, and that you know which contracts and licences require consent to transfer. Fixing problems before a buyer finds them is far cheaper than negotiating over them afterwards.

What are the most common due diligence problems?

Add-backs that cannot be documented, financial statements that do not reconcile to tax returns, customer contracts with change-of-control clauses, misclassified independent contractors, licences that attach to the owner personally rather than the business, and undisclosed litigation or tax exposure. Slow responses and declining performance during the process cause as much damage as any of them.

Can a buyer walk away during due diligence?

Yes. A letter of intent is generally non-binding on price and is usually conditional on diligence being satisfactory. More often than walking away entirely, a buyer will use what they find to renegotiate — which is why the preparation matters so much.

Do my employees have to find out during due diligence?

Not necessarily, and usually not all of them. Most of the process can be handled without staff involvement. Where a buyer needs to meet key people or visit the premises, it can be scheduled and framed to protect confidentiality, and the small number of employees who do need to know can be brought in under their own confidentiality agreements once the transaction is reasonably certain.

What is a virtual data room and do I need one?

A secure online repository for your diligence materials, with controlled access and a record of who viewed what. It lets you release sensitive information in stages rather than all at once, and it creates documentation of exactly what was disclosed — which protects you after closing.

Should I disclose a problem or wait to see whether the buyer finds it?

Disclose it, and disclose it early. Buyers can usually work around a known issue. What damages a transaction is discovering something that should have been shared, because it calls into question everything else they have been told. Early disclosure also lets you frame the issue and its context rather than having a buyer's advisor frame it for you.

Preparing to sell? Start before the buyer does

The owners who move through due diligence smoothly are almost always the ones who assembled the materials long before a buyer asked. Archstone Business Brokers has completed more than 100 transactions representing over $600 million in deal value, working with profitable businesses generating $1 million to $50 million in annual revenue — and we manage this phase for our clients so they can keep running the company. A confidential conversation costs nothing and commits you to nothing.

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