Locked-Box Pricing Freezes Corporate Acquisition Value at Signing While Completion Accounts True Up Post-Closing Working Capital

Buying a commercial real estate property is a static transaction: the building's value and condition on the day the contract is signed are identical to the day the keys change hands. Acquiring a living corporation is entirely different, because a business generates cash, incurs debt, and consumes inventory every hour it operates.

That constant motion creates a valuation gap between the headline price agreed in a boardroom and the actual equity value delivered months later at closing. To bridge that gap, corporate finance relies on two distinct pricing mechanisms: the locked box and completion accounts.

These mechanisms dictate exactly when the economic risk of a business transfers from the seller to the buyer. The choice between them routinely shifts millions of dollars in final proceeds and determines whether a deal ends in a clean break or a protracted accounting dispute.

The mechanics of completion accounts

Completion accounts have long served as the default standard in corporate acquisitions, particularly in the United States. Under this structure, the buyer and seller agree to a provisional purchase price at signing, based on an estimated balance sheet.

The mechanism operates on a straightforward premise: the buyer should only pay for the exact assets and liabilities they receive on the day the deal closes. If the business burns through cash or accumulates unexpected debt before closing, the price adjusts downward.

"Under completion accounts, the deal price is determined at signing using an estimated balance sheet," notes Transaction Services Training. "After closing, a completion balance sheet is prepared, and the price is adjusted based on the actual values."[2]

This adjustment process typically takes 30 to 90 days post-closing, during which the buyer audits the final working capital, cash, and debt levels. They then compare these actual figures against a pre-agreed baseline, known as the working capital peg.[2]

If the delivered working capital falls short of that peg, the seller must refund the difference at a 100% dollar-for-dollar rate. Conversely, if the business delivers excess cash or inventory, the buyer may owe a top-up payment to the seller.

This post-closing true-up provides unparalleled accuracy, ensuring neither side is shortchanged by interim trading fluctuations. However, that precision comes at the cost of certainty, often leaving sellers exposed to aggressive buyer-led accounting interpretations long after the deal has supposedly closed.

The locked box alternative

The locked box mechanism emerged in European private equity markets as a direct response to the uncertainty of completion accounts. Instead of waiting for a post-closing audit, the locked box fixes the final equity price based on one historical balance sheet.

This reference date, known as the locked box date, typically falls 30 to 180 days before the transaction is even signed. From that specific historical moment, the economic risk and reward of the business effectively transfer to the buyer.[1]

"Locked box accounts are designed to ensure that, at completion, the final equity value is known, the full price is paid and there is no further adjustment," explains PKF Smith Cooper.[1]

Because the price is fixed early, the seller enjoys absolute certainty regarding their final proceeds, making the locked box highly attractive in competitive auction scenarios. Bidders submit firm, comparable offers that require zero post-closing true-ups.

However, because the buyer assumes the economic risk before they actually control the company, they require strict contractual protections. The seller must operate the business in the ordinary course and is strictly prohibited from extracting value.

This prohibited value extraction is termed "leakage," which covers unauthorized dividends, management bonuses, or related-party transfers. Any identified leakage must be reimbursed to the buyer, but standard trading losses remain the buyer's problem.[1][2]

Bridging enterprise value to equity

Both mechanisms serve the same fundamental purpose: converting a theoretical enterprise value into a concrete equity purchase price. Enterprise value represents the total value of the business operations, often calculated as a multiple of normalized earnings.

To find the actual cash price paid for the shares, that enterprise value must be adjusted for cash, debt, and normalized working capital. The critical difference between the two structures is simply when that measurement occurs.

Completion accounts measure these items on the exact day of closing, relying on a physical inventory count and a hard close of the financial ledgers. The locked box measures them months earlier, relying on historical audited or management accounts.

"Both mechanisms start from the same place, an agreed enterprise value, and both need to bridge from enterprise value to the equity price actually paid," notes Global Law Experts. "The difference is timing: one locks the numbers down before closing, the other true-ups after it."[6]

Because a locked box seller continues to run the business for months without receiving the profits, they often negotiate a value accrual or ticker rate. This daily interest charge, typically running at 3.0% to 7.0% annualized, compensates the seller for funding the buyer's asset.[2]

Without this ticker, a highly profitable target company would essentially be generating free cash flow for the buyer during the interim period. Negotiating this accrual rate is often as contentious as setting the headline enterprise value itself.[2]

Allocating interim operational risk

The choice of pricing mechanism fundamentally alters how a transaction's risk is allocated during the vulnerable period between signing and closing. This interim phase can last anywhere from a few weeks to over a year if regulatory approvals are required.

Under completion accounts, the seller bears the full weight of operational risk right up until the closing date. If a major customer defaults or inventory spoils during the interim period, the resulting working capital shortfall directly reduces the seller's final payout.

"The premise of completion accounts is straightforward: the buyer should pay for what it actually receives on completion," states Culbert & Ellis. "Any decline in working capital or increase in indebtedness prior to completion is usually captured through the adjustment mechanism."[3]

Conversely, a locked box shifts that operational risk to the buyer from the historical locked box date. If the business suffers a trading downturn between the locked box date and closing, the buyer must still pay the fixed price agreed upon at signing.

This dynamic forces buyers in a locked box transaction to conduct significantly more rigorous financial due diligence before signing. They must be absolutely certain that the historical balance sheet accurately reflects the sustainable run-rate of the business.

"The buyer takes the operational risk from locked box date to closing," Transaction Services Training highlights. "That is the whole point of the structure." This forces acquirers to price in potential interim downturns before submitting their final binding offer.[2]

Dispute frequency and resolution

The post-closing true-up inherent in completion accounts frequently serves as a catalyst for litigation. Because the buyer controls the preparation of the final closing accounts, they have a structural incentive to adopt conservative accounting policies that drive the price down.

Sellers routinely challenge these closing accounts, arguing that the buyer has altered historical accounting practices to manufacture a working capital shortfall. Industry data suggests that post-closing accounts trigger formal disputes in 30% to 40% of transactions, often involving millions in contested value.[2]

These disputes require the appointment of independent accounting experts and can drag on for months, consuming management attention and generating substantial legal fees. The threat of this prolonged uncertainty is precisely what drove European private equity firms toward the locked box.

A locked box largely eliminates post-closing accounting disputes, reducing the dispute rate to under 5% of completed deals, as the price is fixed and the only variable is unauthorized leakage. Proving leakage is generally a straightforward factual exercise, such as identifying an unauthorized dividend payment.

"A locked box fixes the relevant equity-value calculation using historical accounts and relies on leakage protections rather than a conventional post-closing true-up," explains Auxo Capital Advisors. This structural shift replaces subjective accounting debates with objective factual verifications.[4]

Regional and strategic preferences

In 2026, as cross-border M&A activity accelerates, these regional preferences increasingly clash. European sellers auctioning assets to American buyers frequently mandate locked box structures, forcing US corporate development teams to adapt their traditional risk models.

The choice between a locked box and completion accounts remains a negotiation over the price of certainty. Sellers will often accept a slightly lower headline enterprise value in exchange for the absolute finality that a locked box provides, leaving the buyer to manage the interim trading risk.