Quick answer: A buyer’s diligence plan starts from the deal thesis, meaning the few facts that must be true for the price to make sense. The plan ranks workstreams by how much value each could move, assigns each to an accountant, attorney, operator or specialist, and runs cheap tests before expensive reports. Findings then follow a decision rule set in advance, which sends each one to a price adjustment, a structure change, a closing condition or a walk-away.
Key points
- The deal thesis sets the priorities. A buyer writes down the few facts that must be true for the price to work and spends the first part of the budget testing those.
- Cheap tests run before expensive reports. Tying revenue to bank deposits and reading the largest contracts costs little and can end a deal before a full accounting review is commissioned.
- Each finding needs a destination chosen in advance: a price change, a different structure, a closing condition or a walk-away. Deciding the rule first keeps a buyer from explaining away bad news.
- Findings that change recurring earnings are multiplied by the price multiple, while one-time costs and liabilities usually move the price dollar for dollar. Most price adjustments are argued on that distinction.
The deal thesis decides what gets tested
A buyer’s diligence plan is a written list of the facts that must be true for the price to make sense, with a test, an owner and a stopping rule for each. The facts come from the deal thesis, which is the buyer’s reason for paying this price for this business. A thesis that says customers stay when the owner steps back, earnings turn into cash and no unplanned capital is needed produces three workstreams. A thesis that says only that the business looks attractive produces a generic request list and a large invoice.
Workstreams are ranked on three questions: how much value rides on the fact, how likely it is to be wrong given what the seller has shown, and how cheaply it can be tested. A fact with high value at risk and a cheap test goes first. A fact with high value at risk and an expensive test goes second, after the cheap tests show the deal is still worth the spend. Facts with little value at risk are left to the purchase agreement, where representations, warranties and indemnification cover them, and do not get a report of their own.
The table is a template with one row for each assumption in the thesis. A buyer replaces the rows with its own.
| Thesis assumption | First test | Full work | Run by | If it fails |
|---|---|---|---|---|
| Reported earnings are real and repeat | Revenue tied to bank deposits | Earnings review with support for each add-back | Accounting firm | Reprice recurring earnings, or stop |
| Customers stay after the owner steps back | Largest contracts read for change-of-control and termination rights | Retention by customer, then calls with the largest accounts | Buyer, with counsel | Earnout or rollover tied to the account, or stop |
| The business does not depend on one person | Ask who holds each key relationship | Manager interviews, key-employee agreements, a handoff plan | Operator and employment counsel | Retention terms, a longer transition, or stop |
| Working capital and capital spending match the description | Monthly balance sheets and a capital spending list | Working capital analysis and an equipment inspection | Accounting firm and operator | Adjust the working capital target or the price |
| No hidden liability sits in the entity | Tax filings, payroll reports and a litigation list | Tax, legal and environmental review | Tax adviser, counsel, specialists | Indemnity, escrow, price or exclusion |
Who sits on the team
The team is set by the thesis, and its size by the deal. SBA’s guide to buying an existing business lists contracts, leases, existing cash flow and inventory, licenses and permits, zoning and, where real property is included, environmental regulations among the diligence subjects, and it recommends working with an attorney and an accountant.[1] A buyer adds roles beyond those two only where the thesis names a risk they cannot cover.
- Accounting firm. Runs the earnings review described in the guide to quality of earnings, the proof of cash, the working capital analysis and the search for debt-like items.
- Transaction counsel. Reviews contracts, corporate records, litigation, intellectual property and employment arrangements, as the overview of legal diligence outlines, and drafts the purchase agreement.
- Tax adviser. Tests entity status, filing history, payroll and sales tax exposure, and compares the structures available. The tax diligence guide lists the usual areas.
- Operator. A person who has run a business of this kind, visits the site and says whether the explanation of the numbers matches how the place works.
- Specialists by risk. An environmental consultant where the target owns or operates a site, a benefits and insurance broker where the workforce or claims history is a concern (see the HR and employment guide), a technology reviewer where systems carry the business, and regulatory counsel where the company holds licenses.
- Coordinator. One person owns the request list, the findings log and the weekly call, usually the buyer or a buy-side M&A advisor.
Sequencing in gates, with long-lead items started early
Diligence runs in gates, and a buyer pays for each gate only after the one before it is passed.
- Screen. Before a letter of intent, the buyer works from the seller’s own materials. It ties reported revenue to bank deposits, reads the largest contracts and asks the seller to explain each earnings adjustment. These tests cost little, and a failure here ends a deal before any report is commissioned.
- Scope. The letter of intent fixes what the buyer may examine, how much access it gets and how long exclusivity lasts. The guide to writing a buyer’s letter of intent shows how the plan’s scope is written into that document.
- Confirm. The accounting, legal, tax and operating work runs in full. Customer calls come late in this gate, because they alert the market and cost the seller goodwill if the deal then fails.
- Close. Consents, license transfers, insurance and the final update of the numbers run toward the closing date, and the purchase agreement turns unresolved items into conditions or indemnities.
Some work has a lead time or a shelf life and starts before its gate suggests. Third-party consents move at the counterparty’s pace. Environmental assessments are the clearest timing case. EPA’s rule for all appropriate inquiries, which supports certain landowner liability protections for buyers of real property, requires the inquiry to be conducted or updated within one year before the property is acquired, with certain components within 180 days before acquisition.[2] A report ordered too early can go stale before closing, and one ordered too late holds up the closing. The environmental diligence guide explains the sequence.
Red-flag triggers set before the work starts
A trigger is a finding, defined in advance, that changes the buyer’s course. Setting triggers before the first report arrives matters because a buyer deep into a deal tends to explain away facts it would have treated as disqualifying at the start. Triggers also tell the team what to look for and what the seller will have to explain. The guide to red flags buyers find shows the same findings from the seller’s side.
| Trigger | What it signals | Usual response |
|---|---|---|
| Revenue that cannot be tied to deposits after the seller has explained | Records are unreliable or revenue is overstated | Pause until a reconciled bridge arrives, otherwise stop |
| Adjusted EBITDA falls past the tolerance the buyer set | The price rests on earnings that cannot be supported | Reprice recurring earnings and recheck financing capacity |
| The largest customer has a termination right on a change of control, or will not engage | Revenue is at risk because of the sale itself | Consent as a closing condition, an earnout tied to the account, or stop |
| A liability with no cap or no identifiable source | Exposure the buyer cannot price | Special indemnity with an escrow, exclusion through structure, or stop |
| Key employees decline to sign or cannot be reached | The people the thesis relies on are not committed | Retention terms as a condition, or stop |
| The seller limits access to needed records, or answers change between sessions | Information risk is higher than the numbers show | Stop, or reprice for the uncertainty |
Tolerances belong in the plan too, such as how far adjusted EBITDA may fall before the buyer reprices or stops. The buyer sets them with its lender or investors in mind, because their approval depends on the same numbers.
Spending in proportion to the risk
Cost control is part of the plan from the start. Fixed-scope proposals tied to the gates let the buyer stop paying when a gate fails, and an accounting firm can often narrow its scope to the areas the thesis depends on. A seller-commissioned report can shorten the work: a buyer that uses one usually asks the provider for permission to rely on it, then tests for itself the areas that carry the price, and the guide to the sell-side quality of earnings report explains what it covers. One request list, owned by the coordinator, produces faster answers than several, because sellers organize their responses around a single tracker, as the guide to managing the diligence process describes.
Turning findings into price, structure or a walk-away
A findings log keeps the work tied to price, with one entry for each finding: the document that shows it, the dollar effect if known, its class and the destination the plan assigned. The class decides how a finding moves the number. A change in recurring earnings is multiplied by the multiple the buyer used, since the buyer was paying for that earnings stream every year. A one-time cost, such as maintenance the seller deferred, or a liability, such as an unpaid tax, moves the price dollar for dollar or goes into an indemnity or an escrow. A risk that cannot be quantified is handled by structure, with part of the price made contingent through an earnout, or by a closing condition.
Illustrative example: A findings ledger for a priced target
A buyer agrees in a letter of intent to a price of five times adjusted EBITDA of $2,000,000, which is $10,000,000. Diligence produces four findings, and the buyer classifies each before deciding how it moves the price.
| Finding | Class | Effect on price | Arithmetic |
|---|---|---|---|
| $120,000 of add-backs lack support | Recurring earnings | Add-back times the multiple | $120,000 times 5 = $600,000 |
| Unpaid sales tax from earlier periods | Liability | Dollar for dollar, or an indemnity with an escrow | $90,000 |
| Equipment needs repairs the seller deferred | One-time cost | Dollar for dollar | $200,000 |
| The largest customer may not continue | Unquantified risk | Part of the price becomes an earnout tied to that account | No cut; the amount moves from closing cash to a contingent payment |
The three quantified findings total $890,000 ($600,000 plus $90,000 plus $200,000), so the price at closing moves from $10,000,000 to $9,110,000 before any earnout. Adjusted EBITDA falls to $1,880,000, and five times that figure is $9,400,000, which is the $10,000,000 price less the $600,000 earnings adjustment. A lower EBITDA also lowers the debt a lender will advance against it. The numbers are invented to show the mechanics and are not benchmarks, and the multiple is a placeholder, not a multiple any buyer will pay.
Findings reach the seller in writing as they are confirmed, with the supporting document, and not in a single list at the end. A price change that traces to a finding the buyer scoped, documented and raised early is harder to dismiss as tactical. Findings that were visible in the seller’s own materials and surface only after exclusivity begins are the ones sellers treat as a retrade.
The buyer’s roadmap places this plan among the other stages of buying, and the hub on due diligence shows the same workstreams from the seller’s side.
Frequently asked questions
What should a buyer’s due diligence plan include?
A list of what must be true for the price to work, a workstream for each item, an owner for each workstream, a sequence that puts cheap tests first, a budget by stage and a decision rule for each kind of finding. The plan also names who controls the request list and how findings are shared with the seller.
Who is on a buyer’s diligence team?
Usually an accounting firm for the earnings review, transaction counsel for contracts and the purchase agreement, a tax adviser and an operator who understands the industry. Specialists join only for risks the thesis raises, such as environmental, benefits, insurance, technology or regulatory questions. One person coordinates so that requests are not duplicated.
In what order does a buyer run diligence?
Inexpensive tests that could end the deal go first: revenue against bank deposits, the largest customer contracts and the seller’s explanation of each earnings adjustment. Full accounting, legal, tax and specialist reports follow once those pass. Items with long lead times, such as environmental assessments or third-party consents, start early.
When does a diligence finding justify walking away?
When it breaks the thesis and no price or structure fixes it. Examples include revenue that cannot be tied to cash, a largest customer that will not continue after the sale, a liability with no identifiable source, or a seller who restricts access to records the buyer needs. The buyer sets these triggers before the reports arrive.
Thinking about a sale or an acquisition?
The Impetus Group provides sell-side and buy-side M&A advisory, from preparation and buyer outreach to negotiation and closing. A transactional valuation is often the first step, scoped and priced separately.
Related guides
- Due Diligence in a Business Sale: What Buyers Examine and in What Order: Due diligence in a business sale: the workstreams buyers run, their order, who does each, what each can change in price or terms and how sellers stay ahead.
- 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 a Buy-Side Acquisition Process Works: From Strategy to Integration: The stages of acquiring a company: criteria and sourcing, outreach, valuation, the letter of intent, diligence, financing, the purchase agreement and integration.
- How to Buy a Business: A Buyer’s Roadmap From Strategy to Close: How to buy a business, stage by stage: set the thesis, source targets, value, finance, write the LOI, run diligence, close and integrate, with a guide for each.
- Red Flags Buyers Find in Due Diligence and How to Address Them Early: Red flags buyers find in due diligence, from unreconciled books and customer churn to undocumented agreements, with what a buyer infers and how to disclose each.
- Writing a Letter of Intent as a Buyer: Terms That Protect You: How a buyer drafts a letter of intent to buy a business: price assumptions, working capital, diligence, financing, exclusivity, and what binds and what waits.
Sources
- Buy an existing business or franchise. U.S. Small Business Administration. Accessed October 13, 2026.
- Brownfields all appropriate inquiries. U.S. Environmental Protection Agency. Accessed October 13, 2026.
This guide is general education. It is not a valuation opinion, appraisal, investment advice, or legal or tax advice. How these guides are made.