One of the most technically complex — and financially consequential — aspects of any M&A transaction is the purchase price adjustment mechanism. While the headline purchase price gets most of the attention in negotiations, the actual amount that a seller receives at closing and in the weeks following it is determined in significant part by the working capital adjustment, the net debt calculation, and the post-closing true-up process. Business owners who do not understand how these mechanisms work are frequently surprised to find that their net proceeds are meaningfully lower than the number they agreed to in the letter of intent.
Why Working Capital Adjustments Exist
The fundamental purpose of a working capital adjustment is to ensure that the buyer receives a business with a “normal” level of operating liquidity — neither artificially inflated nor deflated — at closing. Working capital, broadly defined, is the difference between a company’s current assets (cash, accounts receivable, inventory, and prepaid expenses, among other items) and its current liabilities (accounts payable, accrued expenses, deferred revenue, and other short-term obligations). A business that is operated with a typical level of working capital will have its day-to-day operations fully funded by the normal cycle of collecting receivables and paying payables.
Without a working capital adjustment, a seller would have a strong incentive to drain the business of cash and accelerate collections in the period before closing, leaving the buyer with insufficient liquidity to operate. Conversely, a buyer would have an incentive to delay closing until the business had accumulated excess working capital that the buyer would then inherit at no additional cost. The working capital target mechanism is designed to prevent both of these distortions by setting a benchmark — the target — and requiring the parties to make price adjustments if actual working capital at closing differs from that target.
Defining Working Capital: Where Disputes Begin
The definition of working capital in the purchase agreement is one of the most heavily negotiated provisions in the document, and for good reason: small definitional differences can translate into large dollar amounts. The definition typically starts with the general concept of current assets minus current liabilities but then specifies precisely which line items are included and excluded. Common exclusions from the working capital definition include cash and cash equivalents (which are addressed separately as part of the net debt calculation), income tax receivables and payables (which are frequently addressed in a separate tax adjustment), and any items that will be treated as seller transaction expenses and deducted from the purchase price.
The battles over working capital definitions typically center on items that fall on the boundary between working capital and something else. Is deferred revenue a current liability that reduces working capital, or is it excluded from the definition because the related services have not yet been performed? Are customer deposits working capital or a form of debt? Is a credit card balance a current liability or indebtedness? Are accrued vacation and paid time off liabilities included in working capital or excluded as separately negotiated obligations? Each of these definitional choices can shift significant value between buyer and seller, and experienced practitioners know to negotiate these definitions carefully and consistently with the way the target peg will be calculated.
The Target Peg and How It Is Set
The working capital target, or peg, is the benchmark level of working capital that the buyer is deemed to have priced into the acquisition. If actual working capital at closing exceeds the peg, the seller receives additional consideration equal to the excess. If actual working capital falls below the peg, the seller refunds an amount equal to the shortfall to the buyer. The peg is therefore not merely a technical number; it is a direct determinant of how much money the seller walks away with.
In most transactions, the peg is set at the historical average or median of working capital over a trailing period, often 12 months. The rationale is that a normal, ongoing business should have approximately its historical average working capital at closing. However, this calculation is rarely straightforward. Working capital levels fluctuate with seasonality, with the timing of large customer payments, with changes in billing practices, and with operational decisions about payment timing. Sellers whose businesses are seasonal should be particularly alert to the risk that a peg based on an average of monthly figures will be significantly higher or lower than working capital at the actual closing date.
The negotiation of the peg is a significant opportunity for each party to gain or concede value. Buyers who set the peg high are effectively requiring the seller to deliver more current assets at closing than a normal business would have, which amounts to a reduction in the effective purchase price. Sellers should examine the proposed peg carefully, understand how it was calculated, and push back if it is higher than the demonstrated historical average.
Net Debt and Its Components
In addition to the working capital adjustment, most M&A transactions include a net debt adjustment that reduces the purchase price by the amount of the company’s indebtedness outstanding at closing and increases it by any cash not already included in the working capital definition. Net debt is typically defined as funded indebtedness less cash and cash equivalents, and it functions as a mechanism to ensure that the buyer is acquiring the business on a debt-free, cash-free basis — meaning that any debt the seller has accumulated is the seller’s problem, not the buyer’s.
The definition of indebtedness is as important as the definition of working capital, and it is just as heavily negotiated. Most definitions include term loans, revolving credit facilities, capital lease obligations, and notes payable. More controversial inclusions are items such as deferred compensation liabilities, pension underfunding, letters of credit (if drawn), customer deposits, royalty obligations, and tax obligations (particularly from pre-closing tax periods). Sellers should scrutinize the definition of indebtedness carefully to ensure that it does not capture items that should properly be treated as current liabilities in the working capital definition, which would result in double-counting against the seller.
The definition of cash is equally important. Cash that is trapped in foreign subsidiaries and subject to repatriation taxes, cash held as collateral for letters of credit, and restricted cash that is not available for general corporate purposes are frequently excluded from the cash component of net debt. If significant amounts of the company’s cash are restricted, the seller may find that the cash it expected to count against debt is not available to do so.
Locked-Box Mechanism
The completion accounts (or closing accounts) mechanism described above is the dominant approach in U.S. M&A transactions, but an alternative approach called the locked-box mechanism is common in European transactions and is increasingly used in the United States. Under a locked-box structure, the parties agree at signing on a fixed purchase price calculated by reference to a historical balance sheet prepared as of a specified date before signing (the locked-box date). From the locked-box date forward, the seller is not permitted to extract value from the business — through dividends, management fees, intercompany payments, or other distributions — except for defined “permitted leakage” items that are agreed in advance.
The locked-box mechanism has significant advantages for sellers. Because the price is fixed at signing without any post-closing adjustment, the seller has certainty about its proceeds from the moment of signing. There is no dispute over the closing balance sheet, no post-closing audit, and no risk that the buyer will take an aggressive position on the working capital calculation after closing. The locked-box also eliminates one of the most common sources of post-closing conflict in M&A transactions.
The disadvantage of the locked-box for sellers is that between the locked-box date and the closing date, the seller is operating the business for the buyer’s benefit but not being compensated for the value created during that period. To address this, sellers typically negotiate a daily or monthly interest accrual on the purchase price (a “ticker”) that compensates the seller for the time value of the consideration it is owed. Buyers, for their part, are accepting the risk that between the locked-box date and closing, the business will perform worse than it did at the locked-box date, which they cannot protect against through a working capital adjustment.
The Closing Statement and Post-Closing Adjustment Process
In completion accounts transactions, the parties prepare a closing balance sheet and a closing statement of working capital and net debt — either at closing (estimated) or within a specified period after closing (final). The typical process works as follows: at or shortly before closing, the seller (or sometimes the buyer) prepares a preliminary estimate of working capital and net debt, which is used to calculate the closing date purchase price. After closing, the buyer prepares a final closing statement, which is delivered to the seller within a specified period — often 60 to 90 days. The seller then has a specified period to review the closing statement and raise objections.
If the parties cannot resolve any disputes over the closing statement through negotiation, the dispute is submitted to an independent accounting firm acting as an expert (not an arbitrator) whose determination is binding on both parties. This expert determination process is designed to be quick and final, but in practice it can be contentious and expensive. The disputes that go to a neutral accountant are often technical accounting issues — whether a specific accrual is appropriate, whether a revenue item should be recognized in a particular period, whether a reserve is adequate — that have large dollar consequences for the parties.
Common Traps and Strategic Considerations
Sellers who have not thought carefully about the working capital mechanism often discover post-closing surprises. Among the most common: the peg was set too high relative to the company’s actual operations, resulting in a shortfall adjustment that reduces net proceeds; the definition of indebtedness captures items the seller did not anticipate, such as deferred compensation or unfunded pension obligations; the cash definition excludes restricted or trapped cash, reducing the cash credit against debt; or the buyer takes aggressive accounting positions in the post-closing closing statement that the seller must challenge through the dispute resolution process.
To protect against these outcomes, sellers should engage financial advisors and legal counsel who are experienced with purchase price adjustment mechanisms before signing the letter of intent. The definitions of working capital, cash, and indebtedness should be thoroughly negotiated. The working capital peg should be set by reference to actual historical data, with adjustments for any known anomalies. And the dispute resolution mechanism for closing statement disputes should be carefully drafted to give each party a fair opportunity to present its position to a neutral accountant. Attention to these details before signing can make a significant difference in the final proceeds the seller receives.