In the complex choreography of mergers and acquisitions, few technical mechanisms generate more friction, negotiation intensity, and post-closing litigation than the net working capital (NWC) adjustment. Industry data from 2024-2025 indicates that working capital disputes account for approximately 65-75% of all post-closing purchase price adjustments that end in arbitration or litigation, with median disputed amounts ranging from $2.5 million to $8.7 million depending on deal size.

The working capital peg—that seemingly innocuous number buried in Section 2.3 of most purchase agreements—represents far more than an accounting technicality. It embodies fundamental disagreements about business normalization, operational performance, and the fair allocation of value between buyer and seller. For middle-market transactions in the $50-500 million enterprise value range, working capital true-ups have become the primary battleground where deals are won, lost, or permanently scarred.

01 The Economic Logic Behind Working Capital Adjustments

Before diving into the mechanics of the peg and why it generates disputes, we must understand the economic rationale. In most M&A transactions, parties agree on an enterprise value based on normalized earnings (typically EBITDA) and an applicable multiple. However, enterprise value represents the value of the business's operations assuming a "normal" level of working capital—the cash tied up in day-to-day operations through accounts receivable, inventory, and accounts payable.

Consider a software distribution business valued at $100 million based on $10 million of EBITDA at a 10.0x multiple. If at closing the seller has allowed receivables to balloon by collecting slowly, or has depleted inventory below operational requirements, the buyer receives less economic value than contemplated in the deal structure. The working capital mechanism exists to true-up for these deviations.

The fundamental principle: the buyer should receive the business with sufficient working capital to operate in the ordinary course, neither subsidizing the seller's pre-close cash extraction nor paying for excess working capital the business doesn't require.

The Two Dominant Structural Approaches

Modern M&A practice has evolved two primary mechanisms for handling working capital considerations:

Completion Accounts (Closing Accounts): Common in European transactions and increasingly in cross-border deals, this approach involves a post-closing determination of actual net working capital, compared against the peg, with dollar-for-dollar adjustments to purchase price. The process typically involves 60-90 days of preparation by the seller, followed by 30-45 days of buyer review, with disputes escalated to independent accounting experts.
Locked Box: Predominantly European but gaining traction in North American private equity transactions, the locked box fixes economic transfer at a historical date (often the last audited balance sheet date). The seller retains all economic benefits and bears all risks up to that date, while the buyer assumes them thereafter. No post-closing adjustment occurs, but the seller provides warranties that no "leakage" of value occurred between the locked box date and closing.

In the North American middle market, completion accounts with working capital adjustments remain the dominant structure, appearing in approximately 78% of private equity-backed transactions in 2024-2025, according to SRS Acquiom data. The locked box mechanism, while growing, still represents only 15-18% of U.S. middle-market deals, with the remainder using hybrid or alternative structures.

02 Anatomy of the Net Working Capital Peg

The NWC peg represents the normalized level of working capital the business requires to operate. Establishing this figure involves three critical steps, each fraught with potential disagreement:

Step 1: Defining the Components

Not all balance sheet items constitute "working capital" for M&A purposes. The definition typically includes:

Accounts receivable (trade receivables, net of allowances)
Inventory (raw materials, work-in-process, finished goods)
Prepaid expenses and other current assets (selectively)
Accounts payable (trade payables)
Accrued expenses (selectively, often excluding transaction-related items)
Deferred revenue (for subscription or service businesses)

The formula: NWC = Current Assets (defined) - Current Liabilities (defined)

Critical exclusions typically include cash, debt, transaction expenses, income taxes payable/receivable, and any items already addressed in the enterprise value bridge. In 2025, we're seeing increased sophistication around contract assets and liabilities under ASC 606 revenue recognition, particularly in software and professional services transactions where these items can represent 15-25% of total working capital.

Step 2: Selecting the Measurement Period

The peg is typically calculated as an average over a historical period, most commonly:

Trailing twelve months (TTM): The most common approach, appearing in approximately 52% of deals, providing a full business cycle view
Trailing six months: Used in 23% of transactions, particularly for businesses with shorter cash conversion cycles
Last fiscal year-end: A snapshot approach in 18% of deals, often when recent audited financials provide a clean baseline
Multiple year average: Employed in 7% of transactions with high seasonality or cyclicality

The selection of measurement period dramatically impacts the peg level. A business with strong recent growth may show higher working capital in recent months, leading sellers to advocate for shorter measurement periods. Conversely, buyers often prefer longer periods to smooth anomalies and seasonal fluctuations.

Step 3: Normalization Adjustments

This is where art meets science and disputes are born. Normalization adjustments modify historical working capital levels to reflect "normal" operations. Common adjustments include:

Seasonality adjustments: For businesses with pronounced seasonal patterns (retail, agriculture, construction), adjusting to reflect typical levels at the expected closing date
Growth adjustments: Increasing the peg to reflect working capital needs of a growing business, often calculated as a percentage of revenue growth
One-time items: Removing effects of unusual transactions, customer prepayments, or supplier payment timing
Policy changes: Adjusting for changes in payment terms, credit policies, or inventory management that occurred during the measurement period

In a 2024 analysis of 147 middle-market transactions, normalization adjustments moved the peg by a median of 8.3% from the raw historical average, with a range of -4% to +22%. The magnitude and direction of these adjustments represent the single largest source of negotiation intensity during deal documentation.

03 Why Working Capital Pegs Generate Disputes

The statistics are sobering. According to data from major escrow and dispute resolution providers, working capital adjustments result in disputes in 35-42% of transactions where they're employed. Of these disputes, approximately 60% are resolved through negotiation, 25% through independent expert determination, and 15% escalate to arbitration or litigation.

Root Cause 1: Asymmetric Information and Incentives

Sellers possess superior knowledge of business operations, customer payment patterns, supplier relationships, and seasonal fluctuations. This information asymmetry creates opportunities for sellers to advocate for peg levels that, while defensible, tilt in their favor. Buyers, even with extensive due diligence, often lack the granular operational knowledge to effectively challenge seller positions until post-closing, when they experience actual working capital requirements.

The incentive misalignment is stark: every dollar of peg increase represents a dollar the seller can extract pre-closing (through aggressive collection, inventory reduction, or payment delays) without triggering a post-closing adjustment. In private equity transactions, where sellers often roll equity, this dynamic is somewhat mitigated, but in clean-exit scenarios, the temptation to optimize pre-closing working capital is significant.

Root Cause 2: Definitional Ambiguity

Despite pages of definitions in purchase agreements, ambiguity persists. Consider these common disputes:

Case Example 1: In a 2024 industrial distribution transaction, the parties disputed whether customer rebates should be accrued monthly based on estimated annual volumes or only when contractual thresholds were definitively met. The difference: $3.2 million in a $75 million deal. The purchase agreement was silent on accrual methodology, stating only that accruals should be "consistent with past practice"—but past practice had been inconsistent.

Other frequent definitional disputes include:

Treatment of aged receivables and appropriate reserve levels
Inventory valuation methods and obsolescence reserves
Classification of certain items as current vs. long-term
Handling of intercompany balances in carve-out transactions
Treatment of customer deposits and deferred revenue

Root Cause 3: The Measurement Date Problem

Most agreements specify that closing NWC will be measured "as of 11:59 PM on the closing date" or similar language. This creates a perverse dynamic in the days leading to closing. Sellers may accelerate collections, delay payments to suppliers, or defer expenditures—all technically permissible under "ordinary course" covenants but materially impacting closing working capital.

In a notable 2025 dispute involving a healthcare services company, the seller collected $4.8 million in receivables on the closing date itself, wired the funds to the parent company, and argued that since the collection occurred before 11:59 PM, it reduced closing working capital and triggered a purchase price reduction. The buyer argued this violated the spirit of ordinary course operations. The independent accountant sided with the seller on technical grounds, though noted the practice was "aggressive."

Root Cause 4: Business Performance vs. Working Capital Management

A fundamental tension exists between operating performance and working capital levels. Strong sales growth naturally increases receivables and inventory. The question: should the buyer pay for working capital increases driven by growth they'll benefit from, or should the seller bear the cost of funding growth that occurred on their watch?

This manifests in disputes over growth adjustments to the peg. Sellers argue that if revenue grew 20% during the measurement period, the peg should be increased proportionally to reflect higher working capital needs. Buyers counter that they're paying for growth through the EBITDA multiple and shouldn't pay twice. The economically correct answer depends on whether growth was contemplated in the EBITDA normalization and whether working capital scaled linearly with revenue—questions that require sophisticated financial analysis.

04 The Completion Accounts Process: A Dispute Incubator

The typical completion accounts timeline creates multiple pressure points:

Days 1-60 Post-Closing: Seller prepares closing balance sheet and working capital calculation. During this period, the seller controls the narrative, makes accounting policy elections, and establishes the initial position. Buyers have limited visibility and often insufficient access to underlying records.

Days 61-90: Buyer review period. The buyer's accounting team (often Big Four transaction services professionals) scrutinizes the seller's calculation, requests supporting documentation, and identifies discrepancies. This period is characterized by information requests, disputes over document access, and mounting tension.

Days 91-120: Negotiation and dispute notice. If the parties cannot agree, the buyer delivers a formal dispute notice. The specificity and documentation quality of this notice often determines dispute outcomes.

Days 121-180: Independent expert determination. An accounting firm (typically Big Four, but not the auditor of either party) reviews submissions and makes a binding determination. The expert's scope is limited to items properly disputed; they cannot introduce new issues.

This process, while structured, creates adversarial dynamics. By day 60, positions are entrenched. By day 90, legal counsel is heavily involved. By day 120, the relationship between buyer and seller—critical for transition success—is often severely strained.

05 Locked Box: The Alternative Approach

The locked box mechanism avoids post-closing working capital adjustments entirely by fixing economic transfer at a historical date. The purchase price is adjusted for a "locked box statement" prepared as of that date (typically the last month-end or quarter-end before signing), and the seller warrants that no value leaked from the business between the locked box date and closing.

Advantages of Locked Box

Certainty: Both parties know the final purchase price at signing (subject only to leakage claims)
Simplicity: No post-closing working capital true-up process
Speed: Eliminates 90-180 days of post-closing accounting work and potential disputes
Relationship preservation: Reduces post-closing tension between parties

Disadvantages and Why It Hasn't Dominated

Despite these advantages, locked box remains a minority approach in North America for several reasons:

Seller risk: The seller bears all risk of working capital fluctuation between locked box date and closing, which can span 3-6 months in complex transactions
Leakage disputes: Defining and policing "permitted leakage" creates its own disputes, particularly around management compensation, dividends, and intercompany transactions
Timing premium: Buyers typically demand a discount (interest charge) for the time value of money between locked box date and closing, creating a new negotiation point
Growth scenarios: In high-growth businesses, locked box can disadvantage sellers who fund working capital growth but don't receive compensation for it

The locked box approach works best in stable, mature businesses with predictable working capital, strong financial controls, and relatively short periods between signing and closing. It's increasingly common in European private equity transactions and cross-border deals where parties want to avoid post-closing disputes across jurisdictions.

06 Best Practices for Minimizing Disputes

Based on analysis of hundreds of transactions and dispute outcomes, several practices significantly reduce working capital controversy:

1. Invest in Detailed Definition and Examples

The working capital definition should include specific examples of included and excluded items, with particular attention to gray areas like:

Specific prepaid expense categories (insurance, rent, software licenses)
Treatment of customer deposits by type
Accrued expense categories and estimation methodologies
Reserve and allowance calculation approaches

Leading purchase agreements now include 3-5 pages of working capital definitions with illustrative calculations, compared to 1-2 pages a decade ago.

2. Prepare a Sample Calculation at Signing

Including a sample working capital calculation as an exhibit, showing exactly how the peg was calculated and how closing working capital will be measured, dramatically reduces disputes. This sample serves as a template and interpretive guide for the post-closing calculation.

In transactions using this approach, dispute rates drop to approximately 18-22%, compared to 35-42% without sample calculations.

3. Establish Accounting Principles and Policies

Rather than relying on vague references to GAAP or "past practice," specify the accounting policies that will govern the closing calculation:

Revenue recognition cutoff procedures
Inventory valuation method and obsolescence reserve calculation
Receivable reserve methodology
Accrual estimation approaches
Cutoff procedures for payables and expenses

4. Conduct Pre-Closing Working Capital Reviews

Sophisticated buyers now conduct detailed working capital reviews 30-45 days before expected closing, analyzing actual working capital levels and trends. This allows parties to identify and resolve potential disputes before closing, when incentives to compromise are stronger.

Some transactions include "pre-closing estimates" where the seller provides a good-faith estimate of expected closing working capital 15-30 days before closing, allowing parties to adjust closing cash payments and minimize post-closing adjustments.

5. Consider Collars and Baskets

Many agreements now include mechanisms to reduce disputes over small amounts:

Baskets: No adjustment unless the deviation from peg exceeds a threshold (e.g., $250,000 or 5% of peg), though once exceeded, adjustments are dollar-for-dollar from the first dollar
Collars: A range around the peg (e.g., ±7.5%) within which no adjustment occurs, with adjustments only for amounts outside the collar

These mechanisms reduce disputes over immaterial amounts while preserving protection against significant deviations. However, they must be carefully calibrated—overly wide collars can incentivize gaming behavior.

07 The Role of Quality of Earnings and Financial Due Diligence

A comprehensive quality of earnings (QoE) analysis serves as the foundation for working capital normalization. The QoE process should include:

Detailed working capital analysis showing trends over 24-36 months
Days sales outstanding (DSO), days inventory outstanding (DIO), and days payable outstanding (DPO) trending and benchmarking
Analysis of working capital as a percentage of revenue over time
Identification of seasonality patterns and cyclical factors
Assessment of working capital management practices and policies
Evaluation of one-time items and normalization adjustments

In 2025, leading QoE providers are incorporating more sophisticated analytics, including:

Machine learning models to identify anomalous working capital patterns
Detailed aging analysis of receivables and payables
Customer-level payment pattern analysis
Inventory turnover analysis by product category or SKU

The investment in thorough financial due diligence—typically $75,000 to $250,000 for middle-market transactions—pays dividends by establishing a fact-based foundation for peg negotiations and reducing post-closing surprises.

08 Recent Trends and Future Outlook

Several trends are reshaping working capital mechanics in 2025-2026:

Increased Scrutiny of Revenue Recognition

The adoption of ASC 606 revenue recognition standards has created new complexity in working capital calculations, particularly for software, construction, and professional services businesses. Contract assets, contract liabilities, and the timing of revenue recognition now require careful attention in working capital definitions.

Supply Chain Disruption Impacts

The supply chain volatility of 2021-2023 has had lasting effects on working capital management. Many businesses increased inventory buffers, extended payment terms with suppliers, or modified customer credit policies. These changes complicate historical normalization and require careful consideration of whether they represent temporary responses or permanent operational shifts.

Technology-Enabled Monitoring

Sophisticated buyers are implementing real-time working capital monitoring during the pre-closing period, using data feeds from the target's accounting systems. This transparency reduces information asymmetry and enables earlier identification of issues.

Growing Adoption of Hybrid Structures

Some transactions now employ hybrid approaches, such as locked box for certain working capital components (e.g., receivables and payables) while maintaining completion accounts for others (e.g., inventory in businesses with complex valuation issues). These structures attempt to capture the benefits of both approaches while mitigating their respective weaknesses.

09 Conclusion: Mastering the Mechanism

Working capital normalization represents one of the most technically demanding and commercially significant aspects of M&A execution. The statistics are clear: disputes are common, costly, and relationship-damaging. Yet they are also largely preventable through rigorous analysis, clear documentation, and alignment of incentives.

For CFOs and deal professionals, mastering working capital mechanics is not optional—it's essential. The difference between a well-structured working capital mechanism and a poorly conceived one can easily represent 3-7% of purchase price in middle-market transactions, or $1.5-3.5 million on a $50 million deal.

The key lessons:

Invest heavily in the peg negotiation—it's not a technical detail but a core commercial term
Demand specificity in definitions, with examples and sample calculations
Conduct thorough financial due diligence focused on working capital trends and drivers
Consider alternative structures (locked box, hybrids) when appropriate
Build in mechanisms (collars, baskets, pre-closing reviews) to reduce friction
Maintain perspective—some level of post-closing adjustment is normal and healthy

As M&A markets continue to evolve, with increasing competition for quality assets and pressure on valuations, working capital mechanics will remain a critical value driver and potential pitfall. The professionals who master these technical details—understanding not just the accounting but the commercial implications and dispute dynamics—will consistently deliver superior outcomes for their clients and stakeholders.

Modern valuation and deal analysis platforms like iValuate are increasingly incorporating sophisticated working capital analysis tools, enabling professionals to model different peg scenarios, analyze historical trends, and stress-test working capital assumptions. As the technical demands of M&A continue to increase, leveraging technology to perform rigorous, data-driven analysis becomes not just an advantage but a necessity for competitive deal execution.

Working Capital Normalization: Why the NWC Peg Drives Post-Close Disputes