The 3 Pillars of Financial Due Diligence: Quality of Earnings, Net Working Capital, and Net Debt
Why these 3 concepts define every deal
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Financial due diligence, at its core, answers one question: What is the buyer actually acquiring?
On paper, this seems straightforward. The target has financial statements, a management team providing projections, and perhaps a vendor due diligence report that walks through the numbers. But experienced deal professionals know that reported figures rarely tell the complete story. The gap between GAAP accounts and economic reality is precisely where transaction services work lives.
Three concepts form the analytical backbone of every buy-side or sell-side engagement: Quality of Earnings (QoE), Net Working Capital (NWC), and Net Debt (ND). These are not independent analyses performed in isolation. They are deeply interconnected, and the real skill in financial due diligence lies in understanding how adjustments in one area cascade into the others—and ultimately into the purchase price.
This essay is written for practitioners—whether you are learning transaction services for the first time or refining your judgment after several years in the field. The objective is not to recite textbook definitions, but to explain how these concepts actually work in live deal situations, where the answers are rarely clean, the data is often incomplete, and the commercial stakes are material.
Part I: Quality of Earnings
What Quality of Earnings Actually Means
Quality of Earnings analysis exists to answer a deceptively simple question: Is the EBITDA that underpins the transaction price real, recurring, and sustainable?
The valuation in most private transactions is anchored on an EBITDA multiple. If the buyer is paying 8x EBITDA for a target reporting €20m of earnings, they are implicitly paying €160m of enterprise value. But what if €2m of that EBITDA came from a one-off litigation settlement? Or from an FX hedge that will not recur post-transaction? Or from accounting treatment that accelerated revenue recognition? Suddenly, the sustainable EBITDA might be €18m—and the buyer has potentially overpaid by €16m at that same multiple.
Quality of Earnings work systematically deconstructs reported EBITDA into its component parts, identifying which elements are:
Recurring vs. non-recurring
Cash-generative vs. accounting-driven
Reflective of future performance vs. artifacts of historical circumstances
The output is a normalized or adjusted EBITDA figure that can be defended in negotiations and used reliably for valuation purposes.
The Architecture of QoE Adjustments
In practice, QoE adjustments fall into several categories. Understanding these categories—and their relative priority—is essential for anyone performing or reviewing due diligence work.
1. Exceptional and One-Off Items
These are the most intuitive adjustments. A company incurs a significant restructuring charge in one year, or receives an insurance payout, or books a gain on the sale of an asset. These items distort the underlying profitability and should be removed from normalized EBITDA.
However, what constitutes "exceptional" is often contested. Consider restructuring costs: if a PE-backed industrial business has incurred restructuring charges in three of the last four years, at what point does restructuring become part of the normal operating cost structure? This is where analytical judgment matters. The standard we apply is: would a reasonable buyer expect this cost to recur in the normal course of business going forward?
2. Audit and Reclassification Adjustments
Many companies—especially those with less sophisticated finance functions—do not present their management accounts in a way that aligns with standard EBITDA conventions. A common example involves French companies that record the CVAE (a value-added contribution tax) or employee profit-sharing ("participation et intéressement") below EBITDA when, economically, these are operating costs that should sit within the EBITDA line.
Similarly, R&D tax credits are frequently recorded above or within EBITDA in local GAAP accounts, but the timing and nature of these credits often require normalization. Consider a technology services business that books government R&D subsidies on a cash basis. In a strong R&D year, the current-year P&L might benefit from credits relating to prior-year expenditure. A proper QoE analysis would normalize this—recognizing the credits in the period to which they economically relate.
3. Pro Forma and Scope Adjustments
These adjustments reflect the economic substance of the business as it will exist post-transaction. If the target recently completed an acquisition, the QoE should reflect the full-year contribution of the acquired entity, even if it was only consolidated for seven months in the audited accounts. Conversely, if a division is being carved out, its contribution must be eliminated.
Pro forma adjustments also address standalone costs. A carve-out from a large corporate group will inherit costs that were previously allocated from the parent—IT infrastructure, treasury, HR shared services, and so on. These may be understated in the historical accounts if the parent subsidized the business. The QoE must reflect what the target will actually cost to run as a standalone entity.
4. Run-Rate and Normalization Adjustments
This is where QoE analysis becomes genuinely nuanced. Run-rate adjustments capture the full-year impact of events that occurred mid-year. If a company opened two new restaurants in September, the LTM EBITDA only captures four months of contribution. A run-rate adjustment annualizes the performance—but should also account for any ramp-up period if those restaurants are not yet at steady-state profitability.
Normalization adjustments go further. They address situations where the historical period is unrepresentative of expected future performance for reasons other than discrete events. Foreign exchange provides a clear example: if a business with significant USD revenue exposure generated €5m of FX gains due to favorable EUR/USD movements in the reference period, those gains are unlikely to recur at the same level. The question becomes whether to present EBITDA at constant currency (illustrative) or to make a hard adjustment (substantive).
5. Revenue Recognition and Cut-Off Adjustments
Revenue cut-off issues are among the most technically demanding—and commercially sensitive—areas of QoE work. Many businesses, particularly those with subscription or project-based revenue, apply accounting policies that do not perfectly align with economic substance.
Consider a B2B software business that invoices annual subscriptions upfront but recognizes revenue ratably over the contract term. If the accounting policy is applied inconsistently—or if revenue is being pulled forward near period-end—the reported EBITDA will be overstated. We have seen cases where businesses applied a one-month lag in revenue recognition for certain customer segments (recognizing Month M revenues in Month M+1), which required systematic adjustment to align P&L timing with economic activity.
Similarly, project-based businesses often struggle with percentage-of-completion accounting. A company recognizing revenue on long-term contracts must estimate costs to complete—and these estimates directly impact margin recognition. If the estimates prove optimistic, future periods will bear the cost through margin degradation or outright loss provisions.
The IC Perspective on Quality of Earnings
Investment committees care about QoE for three interrelated reasons:
Valuation Accuracy: The adjusted EBITDA is the denominator in the valuation equation. A €1m downward adjustment at an 8x multiple represents €8m of value reduction. Senior deal professionals therefore scrutinize QoE adjustments with commercial intensity—not just for technical accuracy, but for negotiation leverage.
Earnings Sustainability: Beyond the reference period EBITDA, the QoE informs the committee's view on forward earnings. If the adjusted EBITDA requires significant add-backs for costs that "should" be lower going forward, the committee will probe whether those savings are realistic. A target claiming €1m of cost synergies from a CRM consolidation needs to demonstrate the execution path—or the committee will haircut the projection.
Risk Identification: The QoE analysis often surfaces issues that extend beyond EBITDA. Material cut-off adjustments may indicate weak financial controls. Volatile provision movements may signal aggressive accounting. High customer concentration visible in the revenue decomposition may represent commercial risk. The QoE is often the entry point for deeper diligence.
Where Junior Analysis Typically Breaks Down
In my experience, junior analysts most commonly struggle with:
Failing to distinguish between "hard" and "soft" adjustments: Not every identified variance warrants a QoE adjustment. Some items are presentational only. The discipline lies in separating items that affect sustainable earnings from those that simply explain reported movements.
Mechanical application without economic substance: Applying a standard adjustment (e.g., normalizing bad debt expense to a three-year average) without understanding whether the historical period is representative. If the company improved its credit management, the historical average may overstate future expense.
Missing the interplay with working capital and net debt: A provision release that boosts EBITDA may also reduce a liability that appears in net debt—leading to double-counting if not handled carefully. We will address this intersection explicitly below.
Part II: Net Working Capital
The Role of Working Capital in Deal Economics
Net Working Capital represents the operating capital required to fund the day-to-day activities of the business. In its simplest form:
NWC = Trade Receivables + Inventory – Trade Payables + Other Operating Receivables – Other Operating Payables
But this definition, while technically correct, obscures why working capital matters in transactions.
The purchase price mechanism in most deals includes a working capital adjustment. The buyer and seller agree on a "target" or "peg" level of NWC that should be delivered at closing. If the actual NWC at closing exceeds this target, the buyer pays more (because they are receiving more operating capital than expected). If it falls short, the purchase price is reduced.
This creates a direct link between the NWC analysis and the equity value paid by the buyer. A €1m shortfall in delivered working capital is a €1m reduction in the price the buyer pays—dollar for dollar.
Defining the Working Capital Perimeter
The first analytical challenge is defining which balance sheet items belong in NWC. This is where transactions get contentious, because the perimeter directly affects the target and, therefore, the price adjustment.
The general principle is that NWC should include items that:
Are operating in nature (related to the normal commercial cycle of the business)
Fluctuate in the ordinary course (as opposed to being static liabilities)
Will be managed by the buyer post-transaction as part of normal operations
Items typically included:
Trade receivables (net of provisions)
Inventory (raw materials, work in progress, finished goods)
Trade payables
Accrued expenses (salaries, utilities, operating costs)
Prepaid expenses (insurance, rent, subscriptions)
Deferred revenue (customer prepayments for services to be rendered)
Items typically excluded (treated as debt-like or cash-like):
Corporate income tax balances
Dividend payables
Restructuring accruals
LTIP or bonus accruals that crystallize on change of control
Fixed asset payables (often treated as capex-related)
Provisions for disputes or litigation
However, the treatment of specific items is heavily negotiated. Consider employee profit-sharing in a French target: some buyers argue this is an operating expense accrual belonging in NWC, while others treat it as a debt-like item excluded from NWC and added to net debt. The economic impact is identical in terms of enterprise-to-equity bridge, but the negotiation dynamics differ depending on how the SPA defines NWC versus net debt.
Calculating the Working Capital Target
The most common methodology for setting the NWC target is a historical average—often the trailing twelve months (LTM) average of monthly NWC balances.
This approach is intuitive: the average represents a "normal" level of working capital the business requires to operate. Seasonal businesses will have months of high NWC (inventory build ahead of peak season) and months of low NWC (post-season inventory liquidation). The average smooths this volatility.
However, the mechanical average is a starting point, not an endpoint. The NWC analysis must consider:
Normalization adjustments: Just as QoE adjusts EBITDA for non-recurring items, NWC must be adjusted for non-recurring balance sheet positions. If the company received an unusually large customer prepayment in one month (creating an abnormal deferred revenue spike), this should be normalized. If a major supplier offered extended payment terms as a one-time favor, the payables balance in that month is unrepresentative.
Trend analysis: A business growing at 20% per year will naturally require more working capital over time. If the NWC target is set at the LTM average but the business has grown significantly, the target may be artificially low. Conversely, a declining business may have inflated historical NWC that is no longer required.
Seasonality considerations: The timing of the locked-box date or completion date matters enormously. If a retailer closes its transaction on December 31, its inventory and payables will be at seasonal peaks. The NWC target must be adjusted to reflect the expected NWC at that specific point in the seasonal cycle—not an annual average.
The Working Capital–Net Debt Interface
This is where the interconnection between NWC and net debt becomes critical.
Some items sit at the boundary between operating working capital and debt-like obligations. Consider:
Accrued bonuses that accelerate on change of control: These are operating accruals in the normal course, but if a transaction triggers immediate payout, they become debt-like cash obligations.
Provisions for services to be rendered: In project-based businesses, accruals for costs to complete long-term contracts may be classified as provisions (outside NWC) or as operating accruals (within NWC). The classification affects both the NWC target and the net debt bridge.
Deferred revenue: Customer prepayments are liabilities—but they also represent future revenue. If deferred revenue is excluded from NWC, the target will be higher (because a liability is removed), but the buyer is then receiving a "free" source of cash that will convert to revenue post-closing.
The key discipline is consistency: whatever perimeter is established for NWC at the target date must be applied consistently to the reference date, the LTM average, and the closing balance sheet. Inconsistent treatment creates inadvertent price adjustments.
What Strong NWC Analysis Looks Like
A rigorous NWC analysis should include:
Monthly balance sheet data for at least 18-24 months (to capture full seasonality)
Clear perimeter documentation specifying which items are included/excluded and why
Normalization schedules for unusual items
Trend analysis showing NWC as a percentage of revenue or cost of sales
Commentary on DSO, DIO, and DPO (days sales outstanding, days inventory outstanding, days payables outstanding) to benchmark against industry norms
Sensitivity analysis showing how different target methodologies (LTM average vs. point-in-time vs. pro forma) affect the adjustment
The investment committee will evaluate whether the proposed NWC target is defensible and whether it exposes the buyer to leakage risk (if the seller can manipulate NWC between signing and closing through accelerated collections or deferred payments).
Part III: Net Debt
Net Debt as the Bridge from Enterprise to Equity Value
Net Debt represents the financial obligations (less available cash) that reduce the value available to equity holders. In its simplest form:
Equity Value = Enterprise Value – Net Debt
If the buyer agrees to pay €100m EV for a target with €20m of net debt, the equity check is €80m. Conversely, if the target has €10m of net cash, the equity value is €110m.
This arithmetic is mechanical. The analytical complexity lies in determining what constitutes "debt" and "cash" for transaction purposes.
Reported Net Financial Debt vs. Adjusted Net Debt
Reported net financial debt typically includes:
Bank loans and credit facilities
Bonds and other capital market instruments
Finance lease obligations
Cash and cash equivalents (offset against debt)
However, the adjusted net debt used in purchase price calculations almost always diverges from the reported figure. The adjustments fall into several categories:
1. Debt-Like Items in Working Capital
Certain liabilities that appear within operating balances are economically equivalent to financial debt. Common examples include:
LTIP payables: Long-term incentive plan accruals that crystallize on transaction
Earn-out payables: Deferred consideration from prior acquisitions
Put options on minority interests: If the company has written put options to minority shareholders, the potential cash outflow is debt-like
Overdue payables: Trade payables significantly past due may represent de facto financing from suppliers
These items must be reclassified from working capital to net debt to avoid double-counting. If an LTIP payable of €3m is left in NWC, it will reduce the NWC delivered at closing, triggering a price adjustment. But if it is also excluded from NWC and added to net debt, the buyer benefits twice.
2. Provisions for Risks and Charges
Not all provisions are debt-like—but many are. The question is whether the provision represents a probable cash outflow that the buyer will inherit.
Restructuring provisions: If the seller initiated a restructuring program, the accrued but unpaid costs should typically be borne by the seller (treated as debt-like).
Litigation provisions: Probable losses from pending disputes are debt-like if the buyer inherits the liability.
Environmental provisions: Site remediation obligations represent future cash outflows.
Pension provisions: Defined benefit pension deficits are frequently treated as debt-like, though the treatment varies by jurisdiction and plan structure.
The deferred tax effect must also be considered. A €10m litigation provision with a 25% tax rate generates a €2.5m deferred tax asset. The net debt-like amount is €7.5m, not €10m.
3. Cash Restrictions
Not all cash is available for distribution to shareholders. Common restrictions include:
Trapped cash: Cash held in jurisdictions with repatriation restrictions or withholding tax implications
Cash held as security: Deposits pledged against bank guarantees or letters of credit
Intra-month cash requirements: The minimum cash needed to fund daily operations between payroll dates
A business may report €50m of cash, but if €10m is trapped in a restricted market, €5m is pledged against guarantees, and €3m is required for operational float, the available cash is only €32m.
4. Off-Balance Sheet Items
Certain obligations do not appear on the statutory balance sheet but have cash implications:
Operating lease commitments: Under IFRS 16, most leases are now on-balance sheet, but some short-term or low-value leases remain off-balance sheet
Tax exposures: Contingent tax liabilities identified by tax due diligence
Guarantees and indemnities: Parent company guarantees that will be called upon transaction
Level 1 vs. Level 2 Net Debt
Many advisors distinguish between "Level 1" and "Level 2" net debt items:
Level 1: Items with high certainty and clear economic substance that should definitively adjust the purchase price (e.g., bank debt, cash, crystallized LTIP payables).
Level 2: Items that are more judgmental, may depend on future events, or are subject to negotiation (e.g., contingent earn-outs, uncertain tax positions, deferred tax assets from losses).
This distinction helps prioritize negotiation focus. Level 1 items are typically non-negotiable. Level 2 items may be addressed through SPA mechanisms—escrows, indemnities, or price adjustments tied to future outcomes.
The SPA Dimension: Locked-Box vs. Completion Accounts
The purchase price mechanism chosen for the transaction directly affects how NWC and net debt are analyzed.
Completion Accounts: The purchase price is adjusted based on the actual NWC and net debt at the closing date. This requires closing balance sheet preparation, post-closing true-up procedures, and often leads to completion disputes.
Locked-Box: The purchase price is fixed based on a reference balance sheet (the "locked-box date"), typically several months before closing. The buyer accepts the NWC and net debt as of that date, and the seller provides warranties that no "leakage" has occurred between the locked-box date and closing.
From a due diligence perspective, locked-box deals require more intensive analysis of the reference balance sheet—because there is no opportunity to true-up post-closing. The NWC target is typically set at the locked-box NWC level, not an average. The advisor must be confident that the locked-box balance sheet is accurate and that the leakage protections are robust.
Part IV: The Interconnection
Why the Three Pillars Cannot Be Analyzed in Isolation
The most common error in junior due diligence work is treating QoE, NWC, and net debt as separate workstreams that do not interact. In reality, they are deeply interconnected, and adjustments in one area frequently cascade into the others.
Example 1: Provision Movements and QoE
A company releases a €2m litigation provision because a legal claim was settled favorably. This release flows through the P&L—potentially above EBITDA if the company treats it as an operating item. The QoE analysis should eliminate this release as a non-recurring item, reducing adjusted EBITDA by €2m.
But the provision release also reduced a liability on the balance sheet. If that liability was classified as debt-like, the net debt decreased by €2m. If the buyer does not adjust for both—removing the EBITDA benefit AND removing the net debt reduction—they are double-counting.
Example 2: Deferred Revenue and Working Capital
A SaaS company collects annual subscriptions upfront. Deferred revenue (a liability) increases when cash is collected and decreases as revenue is recognized. If deferred revenue is included in NWC (which it typically is, as an operating liability), a company that grows rapidly will show improving NWC—because the liability grows with collections.
But if the NWC target is set based on historical averages and the company is growing, the target may be too low. The buyer will receive more deferred revenue liability than expected—which is actually a benefit, because that liability will convert to revenue post-closing.
This requires careful thought: should the NWC target reflect the growth trajectory? Should deferred revenue be normalized separately? The answer depends on the specific circumstances and the negotiation dynamic.
Example 3: CIT Balances at the Boundary
Corporate income tax payables and receivables sit at the intersection of NWC and net debt. The treatment affects both analyses:
If CIT payables are in NWC, they reduce NWC and therefore increase the NWC target adjustment if actual NWC at closing is lower than target.
If CIT payables are excluded from NWC and treated as debt-like, they increase net debt directly.
The economic result is the same, but the optics and negotiation dynamics differ. Sellers often prefer CIT in NWC because it makes the NWC target look more achievable. Buyers often prefer CIT in net debt because it creates a clearer liability.
The Investment Committee View
From an IC perspective, the three pillars together answer:
What is the sustainable earnings power of this business? (QoE)
How much capital is tied up in operations, and is that level appropriate? (NWC)
What are the financial obligations we inherit, and what cash is available? (Net Debt)
These combine into the fundamental deal equation:
Equity Value = (Adjusted EBITDA × Multiple) – Adjusted Net Debt ± NWC Adjustment
The IC wants to see that the due diligence work has stress-tested each component:
Is the adjusted EBITDA defensible? What are the key risks to sustainability?
Is the NWC target appropriate? What happens if the business underperforms and NWC deteriorates?
Is the net debt complete? Are there contingent liabilities not captured?
Strong due diligence does not just answer these questions—it quantifies the sensitivity. A €1m downward adjustment to EBITDA at an 8x multiple costs €8m. A €2m increase in net debt costs €2m. The IC needs to understand the materiality of each risk.
Conclusion: Judgment, Materiality, and Deal Relevance
Financial due diligence is not an academic exercise. It exists to inform investment decisions with real capital at stake.
The technical skills—understanding accounting standards, building schedules, reconciling data—are necessary but not sufficient. What distinguishes strong transaction services work is the judgment to distinguish material issues from noise, the commercial awareness to understand how findings affect negotiation leverage, and the communication skill to present conclusions clearly to decision-makers who may not be accountants.
Quality of Earnings, Net Working Capital, and Net Debt are the three lenses through which every deal is examined. Master them individually, understand their interconnections, and always keep the deal impact in view. That is the foundation of practitioner-grade financial due diligence.
