Working Capital Adjustments in M&A Transactions

Working capital adjustments are one of the most negotiated and least understood elements of M&A transactions. While the headline enterprise value and EBITDA multiple get the most attention, the working capital mechanism can shift millions of dollars between buyer and seller in the final purchase price calculation. This guide explains why working capital matters, how to calculate and normalize it, the difference between locked box and completion accounts, and the practical mechanics of the true-up process. Whether you are buying, selling, or advising, mastering working capital adjustments is essential to ensuring a fair deal.

Why Working Capital Matters in M&A

When a buyer acquires a business, they expect to receive it in normal operating condition. That means the business should come with enough working capital -- cash tied up in inventory, receivables, and prepaid expenses, net of payables and accrued liabilities -- to continue operating without the buyer immediately injecting additional funds. The working capital adjustment mechanism ensures this.

Without a working capital mechanism, a seller could manipulate the effective purchase price by drawing down working capital before closing: accelerating receivable collections, delaying inventory purchases, or stretching payables beyond normal terms. The buyer would receive a cash-depleted business that requires immediate capital injection -- effectively paying the agreed enterprise value plus the cost of rebuilding working capital.

Conversely, if the business has excess working capital at closing (above what is needed for normal operations), the seller deserves compensation for leaving that value behind. The working capital adjustment ensures that neither party is advantaged or disadvantaged by the precise level of working capital on the closing date.

Net Working Capital: Definition and Scope

In an M&A context, net working capital (NWC) is defined differently from the textbook accounting definition. The M&A definition is:

NWC = Current Operating Assets - Current Operating Liabilities

Critically, NWC for M&A purposes excludes cash, short-term debt, and the current portion of long-term debt. These items are handled separately in the enterprise value bridge as components of net debt. Including them in working capital would double-count their effect on the purchase price.

The exact scope of working capital is negotiated in the purchase agreement and defined in an exhibit or schedule that lists every balance sheet line item and whether it is classified as working capital, net debt, or excluded. This definitional exercise is one of the most important negotiations in the deal -- a line item moved from working capital to net debt (or vice versa) can shift millions of dollars in the final price.

Normal vs. Actual Working Capital

The central concept in working capital adjustments is the distinction between “normal” (or “target”) working capital and “actual” working capital at closing. Normal working capital represents the level of NWC the business requires for day-to-day operations under typical conditions. Actual working capital is the NWC on the balance sheet as of the closing date.

The purchase price adjustment is calculated as:

Adjustment = Actual NWC at Closing - Target NWC (Peg)

If actual NWC exceeds the target, the buyer pays more (the seller left extra value in the business). If actual NWC is below the target, the buyer pays less (the business has been partially depleted of operational capital).

Setting the Working Capital Peg (Target)

The peg is the single most negotiated number in the working capital mechanism. Both parties want it set at a level that benefits them: sellers prefer a lower peg (so the actual NWC at closing is more likely to exceed the target, resulting in an upward price adjustment), while buyers prefer a higher peg (making a downward adjustment more likely).

The most common methodologies for setting the peg are:

• Trailing 12-month average: Calculate NWC at each month-end for the prior 12 months and take the average. This is the most common approach and smooths out seasonal fluctuations.
• Trailing 24-month average: Provides a longer baseline and is preferred when the business has experienced unusual conditions (COVID effects, supply chain disruptions) in the most recent year.
• Median of monthly observations: Less sensitive to outliers than the mean. Useful when there are one or two months with abnormally high or low NWC that distort the average.
• Normalized NWC: Adjusted for known anomalies such as timing of large customer payments, inventory buildups for product launches, or seasonal pre-purchases.

A collar or band mechanism (e.g., no adjustment if actual NWC is within +/- $500K of the peg) is sometimes used to avoid disputes over immaterial amounts. This reduces friction but also reduces precision.

Locked Box vs. Completion Accounts

There are two fundamentally different approaches to handling the economic transfer in an M&A transaction, and each has different implications for working capital.

In a locked box structure, the purchase price is determined based on a historical balance sheet (the “locked box date”), and no further adjustments are made. The seller guarantees that no value has been extracted from the business since that date (“no leakage” provisions). The buyer’s risk is that working capital may deteriorate between the locked box date and closing. To compensate, the seller typically pays the buyer a daily interest amount (“ticker”) from the locked box date to closing.

In a completion accounts structure, the preliminary purchase price is paid at closing, and then a post-closing true-up adjusts the final price based on the actual balance sheet at closing. This is more common in the United States and provides the buyer with the comfort that they are paying for exactly what they receive on the day of closing.

Seasonal Adjustments

Many businesses have significant seasonal variation in working capital. A retailer builds inventory before the holiday season. An agricultural business has large receivables after harvest. A tax services firm collects most revenue in Q1. If the peg is based on an annual average but the closing occurs at a seasonal peak or trough, one party will be disadvantaged.

Solutions for seasonal businesses include:

• Monthly peg schedule: Instead of a single annual peg, agree on a monthly peg that adjusts for the seasonal pattern. The closing month’s peg is used for the true-up.
• Same-month comparison: Compare closing NWC to the same month’s NWC from the prior year, or to the average of the same month over the prior 2-3 years.
• Closing date selection: Time the closing to a month when NWC is close to its annual average, reducing the magnitude of any adjustment.

Commonly Disputed Items

The Working Capital True-Up Mechanism

The purchase agreement specifies every detail of this process: the preparation period, the review period, the dispute resolution mechanism, and the identity of the independent accounting firm. The referee’s scope is typically limited to the disputed items (not the entire closing statement), and their determination is binding. Most agreements specify that the referee must select one party’s position or arrive at a figure between the two positions -- they cannot go outside the range of the dispute (“baseball arbitration” for accounting).

Negotiation Strategies

For sellers:

• Push for a lower peg (using the lowest reasonable measurement period or excluding high-NWC months).
• Prefer a locked box mechanism to lock in price certainty and avoid post-close disputes.
• Exclude deferred revenue from NWC if it is a significant liability (this raises the peg).
• Ensure the working capital definitions are clear and unambiguous -- vague definitions invite buyer-favorable interpretations post-close.
• Maintain normal-course operations through closing. Do not draw down NWC, as this triggers a negative adjustment and can be seen as bad faith.

For buyers:

• Push for a higher peg (using the most representative measurement period that produces the highest average NWC).
• Prefer completion accounts to ensure you pay for exactly what you receive at closing.
• Include deferred revenue in NWC (as a current liability) to lower the actual NWC at closing.
• Scrutinize the target’s NWC trends in the months leading up to the deal. A sudden decline suggests working capital extraction.
• Insist on controlling the preparation of the closing balance sheet -- the party who prepares it has the first-mover advantage in setting the narrative. For comprehensive guidance on financial analysis during deals, see our financial due diligence checklist.

Common Pitfalls

• Ambiguous definitions: If the purchase agreement does not clearly define every line item in the NWC calculation, post-close disputes are almost guaranteed. Attach a sample calculation as an exhibit.
• Inconsistent accounting policies: The closing balance sheet must be prepared using the same accounting policies as the historical financials used to set the peg. A change in revenue recognition, inventory valuation, or accrual methodology between signing and closing can shift NWC by millions.
• Ignoring seasonality: Using an annual average peg for a highly seasonal business with a closing date at the seasonal peak will produce a large positive adjustment, overpaying the seller.
• Overlooking intercompany balances: If the target has significant intercompany receivables or payables that will be settled at closing, these must be handled in the NWC mechanism or the net debt bridge.
• Not securing quality of earnings analysis: A quality of earnings (QoE) report from an independent accounting firm is essential for understanding the target’s NWC patterns, identifying normalization adjustments, and setting a defensible peg.

Worked Example

Consider the acquisition of a mid-market manufacturing company with the following parameters:

• Agreed enterprise value: $150M (7.5x EBITDA of $20M)
• Target NWC (peg): $18.5M (trailing 12-month average)
• Net debt at closing: $35M

Scenario A: NWC above the peg. Closing NWC is $21.0M, which is $2.5M above the $18.5M peg.

Preliminary equity value: $150M - $35M = $115M
WC adjustment: $21.0M - $18.5M = +$2.5M
Final equity value: $115M + $2.5M = $117.5M

The buyer pays the seller an additional $2.5M because the business was delivered with more operational capital than the peg required.

Scenario B: NWC below the peg. Closing NWC is $15.0M, which is $3.5M below the $18.5M peg.

Preliminary equity value: $150M - $35M = $115M
WC adjustment: $15.0M - $18.5M = -$3.5M
Final equity value: $115M - $3.5M = $111.5M

The seller returns $3.5M to the buyer because the business was delivered with less operational capital than agreed. The buyer will need to inject that capital to bring the business back to normal operating levels.

In both scenarios, the enterprise value remains $150M. The working capital adjustment only affects the equity value (the check to the shareholders). This is by design: the EV reflects the value of the business’s operations, while the NWC adjustment ensures the buyer receives the business in “normal” operating condition. Understanding this interplay with enterprise value is critical, and you can find more detail in our guide on M&A deal structures.

Conclusion

Working capital adjustments are a technical mechanism with significant financial consequences. The difference between a well-negotiated and a poorly negotiated NWC mechanism can easily be 1-3% of enterprise value -- which on a $200M deal means $2-6M shifting from one party to the other. The keys to success are:

• Clearly define every line item in or out of NWC, with a sample calculation attached to the purchase agreement.
• Set the peg using a defensible methodology that accounts for seasonality and one-time items.
• Choose the right mechanism (locked box vs. completion accounts) for the deal structure and risk appetite.
• Ensure consistent accounting policies between the peg period and the closing balance sheet.
• Engage experienced financial advisors and a quality of earnings provider who specialize in NWC analysis.

Working capital may not be the most glamorous part of the deal, but it is where precision matters most. The professionals who master this technical domain protect their clients from value leakage and build reputations for rigorous deal execution.