Due Diligence

The workstreams

Diligence is not one process. It is four to seven parallel investigations run by different specialists on overlapping timelines, coordinated through a single request list and a data room. On a $3,000,000 to $15,000,000 deal the buyer's team is usually deal counsel, the lender's underwriter, the buyer, and — above roughly $5,000,000 of enterprise value, or wherever the buyer is a private-equity firm — a transaction advisory firm.

What each workstream is looking for:

• Financial: proof of cash, revenue recognition and cutoff, substantiation of every add-back, monthly gross margin, receivables aging and collectability, inventory existence and valuation, and net working capital trend. Above roughly $5,000,000 of enterprise value this is usually delivered as a formal quality of earnings report; below that the buyer's own accountant or the lender's underwriter more often does the work, and a private-equity buyer commissions one at almost any size.
• Tax: payroll tax filings and deposits, validity of the S-corporation election, unfiled returns, and sales and use tax nexus in every state with customers or remote staff — economic nexus standards have applied since South Dakota v. Wayfair (2018), so a company with no physical presence in a state can still owe back tax there.
• Legal: corporate records and cap table, every material contract read for change-of-control and anti-assignment clauses, litigation and threatened claims, intellectual property ownership (including whether contractors assigned their work), worker classification tested against the IRS common-law control factors, non-competes, and open regulatory or licensing matters.
• Operational: customer reference calls, key-employee retention conversations, supplier terms, systems and software licences, equipment condition, and whether the facility lease can be assigned or must be renegotiated.
• Insurance and benefits: claims history, adequacy of coverage limits, and any unfunded benefit obligation.
• Environmental: a Phase I environmental site assessment under the ASTM E1527 standard practice where real property or certain operations are involved, escalating to a Phase II only where the Phase I identifies a recognized environmental condition.

Timeline, sequence, and who pays

The clock starts at LOI signature and usually runs the length of the exclusivity period. Financial diligence goes first because everything downstream depends on the earnings figure and the working capital peg — the lender cannot underwrite and counsel cannot finalize the purchase price mechanics until those settle. Legal diligence and definitive-agreement drafting run in parallel from roughly week two.

The buyer pays its own advisors. The seller pays its own counsel and the cost of assembling the data room, and absorbs the far larger unpriced cost of management time. As of 2026, all-in buyer-side diligence on a $5,000,000 deal commonly lands between $40,000 and $125,000: quality of earnings roughly $15,000 to $50,000, legal $25,000 to $60,000, and a Phase I environmental assessment $2,000 to $4,000 where one is needed. Those costs are sunk if the deal dies, which is why buyers sequence the cheapest deal-killers first — confirming the lease is assignable costs an hour and can end the process.

Diligence ends when the definitive purchase agreement is signed, not when the buyer stops asking questions. Anything unresolved by then becomes a representation, a purchase price adjustment, an escrow, or a walk.

What actually gets found, and what it costs

The findings that move price are rarely fraud. They are ordinary bookkeeping and compliance debt.

A common pattern: diligence establishes that $85,000 of annual expense presented as one-time in the recast has in fact recurred in each of the last three years, and that the company has been operating roughly $40,000 below its normal level of net working capital because the owner stretched payables in the months before going to market.

On a deal priced at 3.5x SDE, the earnings finding alone moves the price by 85,000 × 3.5 = $297,500. SDE falls from $950,000 to $865,000 and price falls from $3,325,000 to $3,027,500. The working capital shortfall is separate and does not get multiplied: the purchase agreement pegs net working capital to a normalized twelve-month average, so delivering $40,000 below the peg is a dollar-for-dollar $40,000 reduction at closing. Combined effect on the seller's proceeds: $337,500.

Other recurring findings, in rough order of how often they surface: sales and use tax exposure in states where the company never registered; a top customer contract requiring written consent to assignment; contractors who meet the test for employee classification; related-party rent or wages at non-market rates; receivables over 120 days that were never reserved; and deferred revenue on prepaid work booked as income when the cash arrived.

The usual outcome is a retrade, not a walk. A buyer who has spent $60,000 and eight weeks wants to close — at a number that reflects what they found.

Which findings become price and which become paper

A quality of earnings analysis is one workstream inside financial diligence, not a synonym for diligence. It answers what the business earns, and says nothing about whether the lease is assignable or whether the trademark is owned. An audit — an opinion on historical financial statements under an accounting framework — is a third instrument again, and most lower-middle-market targets have never had one, so a buyer asking for audited statements is usually asking for something that does not exist.

Representations and warranties in the purchase agreement do a job diligence cannot. Diligence discovers; representations allocate the risk of what diligence failed to discover; indemnification — with its basket, cap, and survival period — is the remedy when a representation proves untrue after closing.

That division explains how findings get resolved, and the split is predictable. A finding that changes the recurring earnings the multiple is applied to becomes a price cut, because it changes what the business is worth: the misclassified one-time expense above costs $297,500 of price, not $85,000 of escrow. A finding that is a contingent, quantifiable exposure of unknown size — a multi-state sales tax question, a threatened claim, a classification issue — usually becomes a specific indemnity or an escrow sized to it, because neither side can price it today and neither wants to guess.

How sellers come through it without a retrade

The sellers who survive diligence intact have generally run the buyer's financial work on themselves first — a sell-side quality of earnings, or at minimum a recast where every add-back ties to a document. Findings discovered during exclusivity cost price; the same findings discovered a year earlier cost only the effort to fix them.

The non-financial preparation is more mechanical: every material contract pulled and its assignment clause read; the landlord's posture on lease assignment obtained in writing; registration and back exposure quantified in states where economic sales tax nexus is arguable; the general ledger reconciled to the filed tax returns for each of the last three years; and any contractor classification question resolved before a buyer's counsel raises it.

Data room timing matters more than data room polish. A seller who answers a 200-item request list in four days rather than four weeks buys back a third of the exclusivity period, and the speed itself reads as competence in every negotiation that follows.

Related terms

• Quality of Earnings (QoE)
• Letter of Intent (LOI)
• Working Capital Adjustment
• Add-Back