A quality of earnings (QoE) analysis is the backbone of any serious M&A due diligence process. For private company acquisitions in particular — where audited financials are the exception, not the rule — a rigorous QoE review is often the difference between a well-priced deal and an expensive mistake.
For what a full engagement runs, see quality of earnings report cost.
But “quality of earnings” is not a single test. It is a structured investigation across revenue, expenses, working capital, and cash. Done well, it produces an EBITDA figure the buyer can actually underwrite. Done poorly, it leaves valuation risk on the table that typically surfaces within the first 12 months of ownership.
This checklist covers the 12 areas every M&A advisor, PE firm, and deal-side accountant should work through before a transaction closes. It is organized to mirror the flow of a typical QoE engagement: start with revenue, move through earnings normalization, stress-test the balance sheet, and then anchor the whole analysis to cash.
Section 1: Revenue Quality and Sustainability
The most common source of value destruction in acquired businesses is revenue that looked durable but wasn’t. Before accepting any top-line number, work through the following.
1. Revenue recognition methodology
Confirm how and when the company records revenue — on shipment, delivery, percentage of completion, or cash receipt. For businesses with contracts, subscriptions, or milestone-based billing, verify that recognition timing aligns with GAAP or the applicable accounting standard. Aggressive or inconsistent recognition inflates short-term results and creates clawback risk post-close.
2. Customer concentration analysis
Identify the top 10 customers by revenue for each period under review and calculate what percentage of total revenue they represent. A single customer representing more than 15–20% of revenue is a structural risk that warrants deeper diligence — review contract terms, renewal history, and any verbal commitments. Concentration risk rarely disappears after a change of ownership.
3. Recurring versus non-recurring revenue
Separate revenue that repeats by contract or demonstrated behavior from revenue that is one-time, project-based, or opportunistic. The acquirer is buying a stream of future cash flows, not a historical income statement — understanding what portion of trailing revenue is genuinely repeatable is central to a defensible valuation. Be especially skeptical of “recurring” revenue that lacks written agreements.
4. Revenue timing and pull-forward
Review whether management accelerated orders or invoicing in the months approaching the measurement period. Common patterns include offering unusual discounts to pull forward Q4 orders, billing for future deliverables ahead of performance, or shipping incomplete orders to recognize revenue before year-end. A month-by-month revenue bridge compared against prior years typically surfaces these anomalies.
Section 2: EBITDA Normalization and Add-Back Discipline
The seller’s adjusted EBITDA is a starting point, not a conclusion. Every add-back requires documentation and a defensible rationale.
5. Owner compensation and related-party normalization
Determine whether the owner’s total compensation — salary, bonuses, distributions treated as compensation, and personal expenses run through the business — reflects what a market-rate professional manager would cost. Excess owner compensation is a legitimate add-back; personal expenses disguised as business costs are too, but they also signal broader financial management issues that deserve scrutiny. Request payroll records and expense reports, not just the income statement.
6. Non-recurring and one-time expense add-backs
Catalog every add-back claimed by the seller and require contemporaneous documentation for each: invoices, legal bills, board minutes, or insurance claims. Common legitimate add-backs include severance for terminated employees, one-time legal settlements, and costs related to a specific facility closure. Common illegitimate ones include recurring maintenance disguised as a capital project or normalized marketing costs framed as “launch expenses.” Stress-test the run-rate assumption: if the expense won’t recur, what evidence supports that?
7. Normalized owner benefit adjustments
Beyond compensation, owners of private businesses frequently run personal costs through the P&L — vehicle leases, travel, health insurance for family members, and club memberships are the most common. These should be identified through a detailed review of discretionary expense accounts, not accepted from a management schedule alone. Each adjustment should be documented and quantified before it enters the adjusted EBITDA bridge.
8. Pro forma adjustments for acquisitions or divestitures
If the business completed an acquisition or sold a division during the measurement period, the historical EBITDA must be restructured to reflect what the business would have looked like on a full-period, same-structure basis. Pro forma adjustments require a granular build — not a summary entry — and should be validated against the underlying transaction documents and cost accounting detail.
Section 3: Balance Sheet and Working Capital
The income statement tells you what the business earned. The balance sheet tells you whether those earnings converted to cash and whether the business is being run to close a deal.
9. Working capital normalization and peg-setting
Working capital is frequently the most negotiated item in a purchase price adjustment mechanism, and the most common area of post-close disputes. Calculate trailing 12-month average working capital on a normalized basis — removing seasonal spikes, excess cash, and non-operating items — and compare it to the management-proposed peg. Buyers who accept the seller’s working capital schedule without independent reconstruction routinely face a shortfall within 90 days of close.
10. Accounts receivable quality and collectibility
Aged AR reports should be analyzed at the invoice level, not the summary level. Flag receivables more than 90 days past due, related-party receivables, and balances with customers who appear elsewhere as concentration risks. Determine whether the allowance for doubtful accounts is adequate relative to historical write-offs. An understated allowance directly overstates net income and working capital, which inflates both valuation and the working capital peg.
11. Inventory and deferred revenue review
For product businesses, test inventory valuation: Is it priced at lower of cost or net realizable value? When was it last physically counted, and by whom? Stale or slow-moving inventory is frequently carried at cost on private company books long after its recoverable value has declined. For service or SaaS businesses, deferred revenue must be reviewed to understand the fulfillment obligation being assumed — and whether it will convert to margin-positive revenue or represent a cash drain post-close.
Section 4: Cash Verification — The Foundation of Every QoE
Every adjustment to EBITDA is ultimately a hypothesis. A proof-of-cash analysis converts that hypothesis into a verifiable fact by reconciling book-reported revenue and expenses against actual bank activity.
12. Proof-of-cash reconciliation
A proof-of-cash ties every significant revenue and expense item on the income statement to actual cash deposits and disbursements in bank records. This step catches revenue that was recorded but never collected, expenses that were paid but not recorded, and timing manipulations that inflate period-end results. For private company acquisitions — where the seller’s books may have been prepared primarily for tax purposes rather than transaction clarity — a proof-of-cash is not optional. It is the most reliable test of whether the reported financials reflect economic reality.
For a deeper look at how this works in practice, see our article What Is a Proof-of-Cash and Why It Matters in M&A Due Diligence.
From Raw Data to a Defensible EBITDA: How to Structure Your QoE Work
Running through this checklist manually — pulling bank statements, reconciling accounts, mapping trial balance line items to normalized categories — is time-consuming and error-prone at scale. The typical QoE engagement involves thousands of transactions, multiple periods, and document sets that rarely arrive in a clean format.
Getting from a target’s trial balance to a GAAP-structured income statement is itself a non-trivial exercise. We’ve written in detail about that mapping process in From Trial Balance to GAAP-Compliant Financial Statements: How QoEAgent Maps with Confidence.
The discipline of a QoE is not just in knowing what to look for — it is in building an audit trail that holds up under scrutiny. Every adjustment should be supported by a source document. Every add-back should reference a specific invoice, payroll record, or contract. Every working capital figure should trace back to a line in an aged report or bank statement. Shortcuts at this stage routinely resurface as indemnification claims after close.
Use QoEAgent to Run a More Rigorous QoE in Less Time
QoEAgent is built specifically for the M&A due diligence workflow described in this checklist. The platform ingests bank statements, trial balances, and general ledger exports, then automatically reconciles reported financials against actual cash flows — surfacing the discrepancies that manual review misses and accelerating the path from document receipt to adjusted EBITDA.
For PE firms, sell-side advisors, and accounting teams running multiple simultaneous engagements, QoEAgent compresses the most time-intensive parts of a QoE — proof-of-cash reconciliation, transaction categorization, and period-over-period variance analysis — without sacrificing the rigor that buyers and lenders require.
If your team is working on a private company transaction and wants to see how the platform fits your process, visit QoEAgent.ai to learn more or request a demo.