M&A

Locked-box mechanism

Reconcile the agreed equity price to the reference accounts and track value transfers through completion.

Quick answer

A locked-box mechanism fixes a share-sale price by reference to accounts at an agreed historical date. The purchase agreement defines permitted value transfers and protection against other leakage between that date and completion. Review the reference accounts, equity-value bridge and leakage provisions together.

Use the worked example

Meaning and transaction use

DLA Piper explains that locked-box pricing uses the target's historical balance-sheet position and allocates economic benefit and risk from the agreed date. Its discussion identifies leakage as seller-related value extraction and permitted leakage as expressly agreed exceptions. The reliability of the reference accounts is central to the buyer's review. [S1]

Proposed review method: maintain a pricing bridge and a separate leakage ledger. Link every bridge line to the agreed accounts and definitions. For later payments, record recipient, date, purpose, amount and the applicable permission or claim provision. Record unresolved classifications before the closing funds flow is finalised.

Worked example

Illustrative assumptions only. Enterprise value is USD 30 million. The parties agree USD 2 million of cash, USD 7 million of debt and a negative USD 500,000 working-capital adjustment at the reference date. Assume no value-accrual payment and no further pricing adjustment.

Scroll the table horizontally to view all columns.

Bridge itemAmountEffect
Enterprise valueUSD 30,000,000Starting amount
Agreed cashUSD 2,000,000Add
Agreed debtUSD 7,000,000Subtract
Working-capital adjustmentUSD 500,000Subtract
Illustrative equity priceUSD 24,500,000Agreed bridge result

The stated bridge produces USD 24.5 million. A subsequent USD 100,000 seller-related payment would require classification under the actual leakage provisions. Its existence alone does not establish an automatic deduction, claim entitlement or collection.

Proposed transaction review process

Select the reference point

Identify the accounts date, accounting basis and available audit or diligence evidence.

Agree the bridge

Document cash, debt-like items, working capital and any value-accrual mechanics.

Review value transfers

Trace seller-related payments and benefits against the permitted-leakage schedule.

Prepare closing evidence

Reconcile payment instructions, confirmations and any unresolved leakage matters.

Evidence checklist

Reference accounts

Financial statements, supporting ledgers and audit or financial-diligence findings.

Pricing definitions

Signed bridge, classification decisions and treatment of disputed items.

Leakage ledger

Related-party payments, dividends, management charges and their supporting approvals.

Agreement and notices

Permitted-leakage wording, claim procedures, deadlines and contractual remedies.

Decision framework

SituationProposed action
Reference accounts omit a material liabilityAssess the pricing and contractual implications before accepting the bridge.
A seller payment is described as ordinary courseCheck its express treatment and any cap in the agreement.
Completion is delayedRecalculate any agreed value accrual and refresh the leakage review period.
The parties disagree on a transferPreserve evidence and apply the agreed notification and dispute process.

Common errors to check

  • Accepting the reference date without assessing the underlying accounts.
  • Treating all seller-related payments as contractually permitted.
  • Counting the same item in both debt and working-capital adjustments.
  • Missing a contractual notice deadline while a classification remains disputed.

Review the price and leakage evidence

Bring the proposed reference accounts, equity bridge and seller-related payment schedule to an M&A discussion. Identify the unresolved classifications and legal drafting work before agreeing the final funds flow.

Discuss the transaction

Primary references and editorial scope

  1. DLA Piper: Locked Box
    Historical pricing date, equity bridge, leakage and reference-account review. Reference checked 17 September 2026.
Editorial qualification

General M&A education. The worked example and review process are illustrative. This source explains mechanics; current transaction rights, deadlines and remedies depend on the executed agreement and applicable law.

General business information. Obtain advice appropriate to the legal, tax, accounting and financing facts. No offer, lender commitment or transaction outcome is represented. All worked examples use expressly assumed figures. Editorial draft date: 17 September 2026.

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