Vendor Due Diligence Checklist: Preparing a Family Company for Sale

The market a family owner is entering is large and selective. Bain's M&A Report 2026 records global deal value rising 40% to $4.9 trillion in 2025, and its survey of more than 300 M&A executives found that 80% expect to sustain or increase deal activity in 2026. For a CFO preparing a family company for sale in North America this is encouraging, but it is not the same as demand for your asset. Capital is abundant; the scarce resource is a buyer's confidence that your numbers mean what they say.

Sponsors have their own reasons to be demanding. Bain's Global Private Equity Report 2026 puts global dry powder at $1.3 trillion, yet it also records that the industry is still sitting on 32,000 unsold companies worth $3.8 trillion, and that holding periods at exit now hover around seven years, up from five to six years in 2010 to 2021. Those portfolio companies compete with yours for the same pool of buyers, and their owners are under pressure to exit.

Exit conditions are improving. Bain reports that global buyout-backed exit value jumped 47% to $717 billion in 2025. A reopening exit market increases the supply of well-prepared assets, and sponsor-owned businesses typically reach buyers with audited numbers, a structured data room and an adviser team. A family company will be judged against that standard whether or not the comparison feels fair, and buyers read the same signals in every file: reliable earnings, a team that does not depend on one person, and documents that match the story.

The US lower middle market, where most family companies transact, shows how uneven buyer activity can be. GF Data, which collects completed private equity transactions from sponsor contributors, tracked 342 deals in 2020, 501 in 2021, 334 in 2022, 294 in 2023 and 379 in 2024 (Exhibit 1). Gulfstar's summary of GF Data's first-half 2025 figures shows 142 deals, 30% fewer than the 204 completed in the first half of 2024. Timing the market is unreliable; being ready when it opens is within the owner's control.

The implication for the CFO is to treat readiness as the asset. We would set one objective for the next quarter: be able to answer any first-round buyer question within days, with a document and not a conversation. That single test exposes missing reconciliations, undocumented arrangements and unclear ownership of tasks far faster than a general plan to tidy up before the sale.

The failure rate of sale processes is higher than most owners assume. The Exit Planning Institute states that only 20 to 30% of businesses that go to market actually sell, leaving up to 80% without solid options. The statistic is undated on the institute's page, so we treat it as an order of magnitude, but it matches what advisers report: most unsold companies were not unwanted, they were unprepared, or they met a buyer's findings with no answer ready.

Deloitte's divestiture research shows how common abandoned transactions are. In its 2024 survey, 98% of respondents reported at least one abandoned deal. That survey covers corporate and sponsor divestitures and not family companies specifically, so it should not be read as a family-business statistic. Its lesson transfers all the same: a process can look healthy through several rounds and still collapse when a finding appears that the seller did not anticipate and cannot explain.

Time is the second enemy. Deloitte found that sign-to-close timelines have lengthened by roughly 6% since 2020 and can extend to 10 months or more. At the small-business end, BizBuySell reports that the median time to close held at 170 days in 2025, with businesses continuing to sell at 94% of asking price and median sale prices up 2% to $350,000. A gap of six per cent between ask and outcome is, in our reading, the visible footprint of buyer findings converted into price reductions.

The implication is that price is rarely lost in the first conversation. It is lost after exclusivity, when the buyer has stopped talking to others, spent money on advisers and found the first inconsistency. A vendor checklist moves that discovery forward, to a point when the seller can still choose between fixing the issue, explaining it or accepting a price adjustment on terms it has already modelled.

The practical step is a known-issues register, built before any teaser is circulated. Each entry carries the issue, the evidence, the decision (fix, explain or price) and a named owner. Buyers will find most of these items anyway; the register ensures the owner has already decided how to respond, and the CFO can show that the business knows itself.

Sellers also underestimate the cost of a failed first attempt. A company that goes to market and withdraws carries a stigma: later buyers ask why it did not sell, and the next process begins from a weaker position. That is a further reason to resist testing the market informally with an unprepared file. We advise treating the first approach to a serious buyer as the only first impression the business will get.

Many family businesses keep excellent financial records and almost no records of how the family and the company relate. PwC's 2023 Family Business Survey, as reported by PwC Canada, found that 67% of respondents said creating a legacy is a goal and 65% want to ensure the business stays in the family. Yet only 43% agreed that the family's values and mission are articulated in written form, and just 30% have a family constitution or protocol (Exhibit 2).

That gap matters in a sale because buyers and their lawyers test governance as hard as they test earnings. Who actually decides? Which relatives are paid, and for what? What was promised verbally to long-serving staff? Does the company rent premises from a family property vehicle at a market rent? When these answers exist only in people's memories, the buyer's advisers will treat the absence of documentation as risk and reflect it in warranties, retentions or price.

The demographic backdrop adds urgency. The Exit Planning Institute states that 51% of the current American business market is owned by Baby Boomers, which implies a large cohort of owners approaching transition at the same time and drawing on the same limited pool of advisers, lenders and buyers. The institute does not date that figure on its page, but the direction is clear: owners who prepare early will find advisers available and buyers attentive.

There is also a decision problem. If some family members want to keep the business, a sale needs shareholder alignment before it needs a buyer. Buyers will ask whether every shareholder has agreed to the process, whether any holds a veto or a pre-emption right, and whether the sale price will be accepted. A process that stalls on a family disagreement after the data room opens can damage credibility, as well as relationships.

The CFO should therefore convert intent into evidence: a written decision record from the shareholders, a schedule of every related-party arrangement and its commercial terms, and a one-page statement of who has authority to agree the sale. None of this requires a lawyer to draft first; it requires the family to say, in writing, what it has already agreed.

Not every family wants the same outcome, and a sale should be compared honestly with alternatives such as a management buyout, a minority investment or a staged transfer within the family. The checklist serves each route, because lenders, investors and successors all need the same evidence of earnings, governance and dependence. Preparing for a sale therefore preserves options even if the family later decides to keep the business, which is a useful argument when relatives disagree about timing.

A buyer's diligence is wider than a financial review, so the vendor's preparation should be too. The checklist in Exhibit 4 sets out eight workstreams: financial, tax, legal and corporate, commercial, people and family, operations and IT, regulatory and insurance, and the separation of owner interests from the company. For each we list what buyers test and what the seller should have ready. The aim is a file in which every claim can be traced to evidence.

The financial workstream carries the most weight, because it sets the price. Buyers will build their own view of normalised earnings, working capital and debt-like items, and they will challenge every add-back. GF Data reports average multiples of 7.2x in the first half of 2025, so each unit of earnings that cannot be evidenced costs the seller more than seven units of price. A quality-of-earnings narrative, reconciled to the ledger and to tax filings, is the single most valuable document a CFO can prepare.

The commercial and people workstreams are where family companies are often weakest. Buyers want to know how much revenue comes from the largest customers, how long contracts run, how prices were set and whether the pipeline supports the plan. They also want to know who the next layer of management is, which roles are held by relatives and whether the business functions without the owner. Documented answers shorten the buyer's learning curve and reduce the discount for uncertainty.

Operations, IT and regulatory evidence are increasingly decisive. Licences, insurance cover, data-protection compliance, cyber security, software ownership and key supplier terms can each become a condition or a retention if they are unclear. The checklist also includes a separate item for family-owned property, vehicles and personal expenses run through the business, since untangling them late is slow and signals weak control.

The implication is to assign each workstream to a named person and a date, with the CFO as single point of accountability. A checklist without owners becomes a list of aspirations. A checklist with owners, evidence references and a status column becomes the data-room index, and the same document can later support the disclosure letter.

Materiality keeps the exercise proportionate. Agree with advisers a threshold below which items are noted but not investigated, and focus effort on the matters that would move price or terms. A checklist that aims to be perfect is rarely finished; one that is weighted by risk is usually complete in time, and it gives buyers the impression of a management team that knows where its exposures lie.

Size affects what buyers pay. GF Data's 2024 figures show an average multiple of 6.4x for transactions with a total enterprise value of $10–25 million, 6.8x for $25–50 million, 8.3x for $50–100 million and 8.6x for $100–250 million, and its first-half 2025 report shows the $100–250 million tier at 10.0x while sub-$25 million tiers averaged 6.3x and 6.9x. Part of the gap is scale and growth; part is the institutional quality buyers can see in the file.

Family companies lose value in a predictable set of places. Owner remuneration that is above or below market, family members on the payroll, personal costs charged to the company and rents set by relatives all distort earnings. Each can be normalised, but only if the evidence is clear. An add-back that is plausible but unsupported is typically excluded by the buyer, while a favourable one that is documented is more likely to be accepted.

Owner dependence is the second leak. Where the founder holds the main customer relationships, approves every significant decision and carries the company's technical knowledge, a buyer sees transition risk and prices it, usually through a lower upfront payment and a larger deferred or earn-out element. The seller can reduce that discount by documenting processes, introducing second contacts at key accounts and showing decisions made without the owner over a full year.

Related-party property deserves separate treatment. If the company occupies premises owned by the family, buyers will want a lease at market terms, clear rights of occupation and a decision on whether the property is included in the sale. Leaving this to the last stage invites renegotiation. Resolving it early gives the family a choice between selling the property, leasing it or retaining it, each with different tax consequences that advisers should model.

The action for the CFO is a one-page owner-dependence map: for each critical customer, supplier, licence and decision, who holds it today, who could hold it in twelve months and what evidence would convince a buyer. It is also the most honest preparation exercise available to a founder, because it shows exactly what the business would be worth to someone who is not the founder.

Not every sale needs a formal vendor due diligence report. A report, commissioned from an accounting or advisory firm and shared with bidders, gives buyers a single reference point on earnings, net debt and working capital, and can shorten their own work. It also costs money, takes weeks and invites scrutiny of its own scope. The right choice depends on deal complexity and on how dependent the business is on its owner, as Exhibit 5 shows.

A readiness review is the lighter option. The seller, or an adviser, runs the same checklist internally, produces the known-issues register and fills a structured data room, without issuing a report for third-party reliance. For smaller transactions this is usually proportionate. BizBuySell's 2025 figures, with a median sale price of $350,000 and an average cash flow multiple of 2.61x, describe a segment where a full report is rarely economic and where buyers will re-verify numbers regardless.

A formal vendor report earns its cost where several buyers are expected, where the numbers are complex or where past performance includes unusual items that need independent explanation. It is also valuable where the seller wants a quick, orderly timetable. Reports typically cover financial matters; legal, tax and commercial vendor reports can be commissioned separately. Whatever the scope, buyers' advisers will still ask questions, so the report supports the process rather than replacing it.

The CFO should ask three questions before deciding. How many credible bidders will we invite, and will each of them value an independent reference? Which three findings would a buyer most likely use to reduce the price? And can we answer those findings with evidence already? If the answer to the third question is no, the first spend should be a readiness review, because a report on an unprepared company simply documents the problems at a cost.

A final point on independence. A report is credible only if the adviser can say what it found, including unwelcome matters. Owners who expect a vendor report to be a marketing document usually damage its value to buyers. Brief the adviser on scope, not on conclusions, and agree in advance how findings will be handled before the report reaches bidders.

Consider also how the output will be used after the sale. Many documents that a readiness review produces, from the earnings bridge to the owner-dependence map, become the management information a buyer needs for completion accounts and for the opening months of ownership. Sellers who supply them cleanly build goodwill at exactly the point when warranties and any deferred consideration are being negotiated.

A preparation plan should start from the date a data room must be ready and work backwards. Exhibit 6 sets out a 90-day sequence: appoint an owner and freeze the scope, assemble the evidence, reconcile and normalise earnings, close the known issues, draft the narrative and then test the file as a sceptical buyer would. Most family companies can complete this sequence if the CFO is relieved of other projects, and few can complete it in parallel with a live process.

Separation is a particular risk for family groups. Where the business being sold shares premises, payroll, insurance, IT or management with other family entities, the buyer will price the cost of separating it. Deloitte's divestiture survey is again instructive: although many sellers identify stranded costs during the deal, only 11% fully address them, and 72% of surveyed buyers will attempt at least one carve-out acquisition, so buyers are practised at pricing these issues.

Seller experience matters, too. Deloitte found that 74% of seller respondents expect to attempt at least one divestiture, which suggests that sophisticated counterparties will be well drilled in the process, while a family owner may sell a business only once. That asymmetry is the strongest argument for vendor diligence: it replaces experience the owner does not have with a structure the buyer cannot ignore (Exhibit 3).

The timetable should also protect the business. Preparing for a sale takes management attention, and the trading performance in the months before a process is what buyers extrapolate. We recommend ring-fencing a small readiness team, keeping the sale confidential, and agreeing in advance who tells customers, lenders and staff, and when. A drop in performance during preparation costs more than any step in the checklist.

The decision for the board is straightforward. Commit the 90 days, name the CFO as accountable, agree the known-issues register as the central control document, and decide at day 60, with the register in hand, whether to commission a formal report. At that point the family will know what the business looks like from the outside, and it will be a much better judge of when to go to market.

Finally, keep the sale in proportion to the business. A process that absorbs every senior manager for six months, however well run, leaves the company weaker at the moment its results are being judged. Plan the workload explicitly, use outside help for the repetitive work of assembling evidence, and keep the leadership team focused on trading, customers and people.

Karter McKinley's M&A & Corporate Development work supports finance teams and family boards in running the readiness sprint described here: building the checklist, the known-issues register and the data-room index, and preparing the narrative for buyers. Where regulated advice is required, we work alongside appropriately authorised accountants, lawyers and corporate finance firms. This article is information, not advice.