Quick answer: Buyers run due diligence in workstreams: financial and quality of earnings first, then commercial and customer work, legal, tax, employment, operations and, where a site or product is involved, environmental and regulatory. Financial work leads because it decides price. Each workstream has an owner on the buyer’s side and can change the price, the terms or the closing conditions. A seller stays ahead by testing its own numbers and records first, then answering requests from one organized process.
Key points
- Diligence is a set of parallel workstreams. Financial work runs first because it decides price, and the others mostly decide terms, protections and conditions to closing.
- Each finding reaches the deal in a known way: a price deduction, an adjustment to earnings or working capital, a special indemnity, an escrow or a closing condition.
- Buyers test what the memorandum said, so the seller’s best preparation is to run the same tests first and fix or disclose what they show.
- One organized process, with a single contact, a request tracker, staged disclosure and a question log, protects price because delay and contradiction give a buyer reasons to doubt the earnings.
- The workstreams are the same in every industry, but the records that carry the weight differ for a food maker, a staffing firm or a distributor.
Workstreams and who runs them
Due diligence in a business sale is the buyer’s verification of what the seller has said about the company. It runs as parallel workstreams, each led by a different adviser on the buyer’s side, and it gathers pace after the letter of intent because the buyer then holds exclusivity. The financial workstream sets the price. The others mostly set terms: special indemnities, escrows, covenants and conditions to closing.
| Workstream | Led by | What it tests | How findings reach the deal |
|---|---|---|---|
| Financial and quality of earnings | The buyer’s accounting firm | Adjusted EBITDA, revenue, cash, working capital | Lower earnings, a revised working capital target, debt-like deductions |
| Commercial and customer | The buyer’s deal team, sometimes consultants | Contracts, retention, pricing, customer calls | Price, an earnout or a closing condition tied to a contract |
| Legal | The buyer’s counsel | Ownership, contracts, intellectual property, litigation, permits | Closing conditions, specific indemnities, escrow |
| Tax | The buyer’s tax advisers | Entity status, sales and payroll tax, filings | Price deduction, special indemnity, escrow |
| Employment | Counsel and HR advisers | Worker classification, benefit plans, key employees | Corrected costs, indemnity, retention agreements |
| Operations and technology | The buyer’s operating team | Capacity, systems, supply chain, security | Capital needs, integration plans, price |
| Environmental and regulatory | Consultants and regulatory counsel | Site history, permits, product rules | Further study, indemnity, conditions |
The seller’s due diligence checklist lists the documents each workstream requests, and the overview of how an M&A sale process works shows where diligence sits between the letter of intent and the purchase agreement.
The order the work runs in
The sequence shifts with the business and the buyer, but it follows a pattern. Work that sets price comes first. Work that needs the buyer’s commitment comes last.
- Before the letter of intent. The buyer reads the memorandum and a preview of the data room, and asks for monthly financial statements and customer data to support its offer.
- Start of exclusivity. The buyer’s accounting firm begins the quality of earnings review, and counsel opens its legal request list.
- Middle of the process. Tax, employment and operations reviews run alongside, and early findings feed the first price discussions.
- Late in the process. Customer calls, site visits and environmental work happen, which a seller usually protects until the buyer is committed.
- Before signing. Updated results, disclosure schedules and any refresh of the financial figures close the work.
A seller who knows the sequence can have each stage’s records ready before the request arrives.
Financial diligence sets the price
Buyers multiply earnings, so the financial workstream leads. A quality of earnings review is the buyer’s accountants’ test of whether profit is real and repeatable. A seller can commission the same work first: the sell-side quality of earnings report is built after the books are closed and before the memorandum is final, so the figures buyers receive are the ones they later confirm. The findings that most often reduce price include rejected add-backs, cut-off errors, expenses missing from the books, working capital measured at the wrong time and one-time items that keep recurring. The adjustments follow the method in the guide to normalizing earnings.
Three tests sit under the earnings figure. A proof of cash compares bank deposits and payments with reported revenue and expenses month by month and sorts each gap into timing, transfers, owner items or unexplained. Revenue recognition diligence asks whether sales were booked in the right period, looking at cut-off, bill-and-hold sales, work in progress, deferred revenue and rebates. Inventory diligence checks that stock exists, is costed consistently and can be sold for what the books say. A shortfall in any of them lowers adjusted EBITDA, working capital or both.
The last financial question is what comes off the price. Debt and debt-like items are obligations a buyer treats as debt although they are not loans, such as accrued bonuses, deferred revenue, customer deposits, unpaid taxes and owner loans. Each is deducted from the price one for one, so the definition agreed in the letter of intent can matter as much as the multiple.
Customer, legal, tax and people reviews set the terms
Customer work tests whether the revenue being bought will still be there after closing. A buyer reads the largest contracts for length, exit rights, change-of-control language and price terms, rebuilds retention by customer group from invoice data, reviews credits and disputes, and speaks to the biggest customers late and usually with the owner’s consent. The guide to customer diligence covers each step.
Buyer’s counsel checks that the seller owns what it is selling and that nothing in the paperwork blocks the sale. The guide to legal diligence covers ownership records, contracts that need consent on a change of control, intellectual property assignments, permits, litigation and insurance, with a clean-up list for the seller.
Tax advisers check that the company is the kind of entity it says it is and has filed what it owed, from sales and use tax in each state where it sells to payroll tax measured against payroll records, as set out in the guide to tax diligence. The guide to HR and employment diligence covers worker classification, pay practices, benefit plans, restrictive covenants and whether key employees will stay. In all four areas the usual outcomes are a price deduction for past exposure, a special indemnity, an escrow, a retention agreement or a closing condition.
Site, product and industry-specific checks
Where the company owns or leases a plant, a yard or a warehouse, the buyer or its lender may order a records-and-site-visit review for signs of contamination. The guide to environmental diligence and Phase I assessments explains when sampling follows and how a seller prepares. Product and permit questions depend on the industry, and regulatory counsel confirms which rules apply.
The workstreams are the same in every industry, but the records that carry the weight differ. The hub on due diligence and earnings adjustments by industry maps all of them.
For food, beverage and consumer brands, attention goes to trade spend, retailer and distributor terms, product safety records, permits and inventory. The guides cover snack and confectionery, specialty food, beverage, craft alcohol, supplement, personal care and pet product companies.
For professional and technology services, attention goes to the client roster, utilization, work in process, recurring revenue quality and owner or partner pay. The guides cover accounting firms, engineering firms, managed service providers, consulting firms, information services, marketing agencies, staffing firms and training companies.
For building products and manufacturing, attention goes to inventory, supplier rebates, warranty exposure, raw-material pricing, backlog and product certifications. The guides cover furniture makers, building products distributors, cabinet makers, lighting and electrical manufacturers, flooring companies, HVAC and plumbing manufacturers, metal fabricators, roofing and exterior products and window and door manufacturers.
Staying ahead of the buyer’s findings
A red flag is a finding that makes a buyer doubt the numbers or the people behind them, and each one leads to a specific inference. Books that do not reconcile suggest the profit figure may be wrong. Customer churn suggests revenue is less durable than it looks. An agreement that exists only by handshake suggests a missing right or a hidden obligation. The guide to red flags buyers find lists the common ones with the response that works: find the issue first and disclose it with context, evidence and a fix.
The second protection is process. The guide to managing the diligence process describes one point of contact, a tracker that records each request with a responder and a promised date, staged release of sensitive documents and a log of every question and answer. Fast, consistent answers protect price because delay and contradiction give a buyer reasons to doubt the earnings. When findings do reopen the price, the guide to retrades separates fair requests from tactical ones.
Frequently asked questions
What is due diligence in a business sale?
Due diligence is the buyer’s verification of what the seller said about the business, done after a letter of intent and before the purchase agreement is final. Accountants test earnings, attorneys review contracts and records, tax advisers review filings and operating teams look at customers and people. Findings change the price, the terms or the conditions to closing.
In what order do buyers do due diligence?
Financial work usually starts first because it decides price: a quality of earnings review, a proof of cash and a working capital analysis. Commercial and customer work, legal, tax and employment review run in parallel, and environmental or regulatory work follows where a site or product requires it. The order shifts with the business and the buyer’s priorities.
How long does due diligence take?
It depends on the size and complexity of the business, how organized the records are and how quickly the seller answers. The seller controls much of the delay. Clean monthly books, a staged data room and one point of contact for requests shorten the process, while slow or inconsistent answers lengthen it and invite requests to change the price.
What do buyers look for in due diligence?
Buyers look for evidence that reported earnings are real and repeatable, that customers will stay, that the seller owns what it is selling, that tax and payroll obligations are met and that the people who matter will remain. They also look for obligations that reduce proceeds, such as debt and debt-like items.
Can a seller prepare for diligence before going to market?
Yes, and it is the most reliable way to protect price. A sell-side quality of earnings report, a proof of cash, cleaned records and a data room organized to match a buyer’s request list let the seller find and explain problems before a buyer’s accountants do.
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Related guides
- Due Diligence Checklist for Sellers: What Buyers Ask For and Why: A checklist of the documents and answers buyers request in diligence on a company sale, grouped by area, with the reason each request is made.
- Quality of Earnings Report: What It Is and What Buyers Test: A quality of earnings report tests whether a company’s reported profit is real and repeatable. See what buyers examine, how it affects price and how sellers prepare.
- How an M&A Sale Process Works: Stages From Preparation to Closing: A step-by-step view of a sell-side M&A process: preparation, marketing, bids, the letter of intent, diligence, the purchase agreement and closing.
- How to Sell a Business: The Process, the Terms and the Decisions: How to sell a business from the decision to the first year after closing: preparation, outreach, offers, diligence, the purchase agreement, tax and transition.
- Normalizing Earnings for a Sale: Adjusted EBITDA, Step by Step: Normalized EBITDA for a sale: the four-step method from net income to adjusted EBITDA, the adjustment categories, the evidence buyers accept and how it sets price.
- Sell-Side Quality of Earnings Report: Scope, Timing and How to Use It: What a sell-side quality of earnings report covers, when an owner should commission it, who should perform it and how to use it in the CIM and with buyers.
This guide is general education. It is not a valuation opinion, appraisal, investment advice, or legal or tax advice. How these guides are made.