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Completion accounts and locked-box mechanisms are two common ways to determine final consideration in an Australian business sale, and both can materially affect a seller’s net proceeds. For a business valuer, the key issue is not just legal drafting, but how each mechanism allocates value, working capital movements, debt, cash and timing risk between buyer and seller. In practice, the pricing mechanism can influence valuation outcomes, particularly where earnings are volatile, working capital is seasonal, or the transaction price is based on an EBITDA multiple, a DCF model, or an agreed equity value at completion.

Understanding the Two Pricing Mechanisms

In a business sale, the headline price is rarely the final amount received. Australian private company transactions commonly adjust the purchase price for debt-like items, surplus cash, working capital and leakage. Completion accounts and locked-box are simply two different ways of handling those adjustments, and each has different implications for valuation engagement work, deal certainty and final proceeds.

What are completion accounts?

Completion accounts are post-completion financial statements prepared to determine the actual net debt, cash and working capital position at the completion date. The transaction is often priced on an assumed balance sheet at signing, then adjusted after completion once the final accounts are prepared and agreed. If the business has more working capital than expected, the seller may receive additional consideration. If it has less, the buyer may receive a reduction in price.

From a valuation perspective, completion accounts are especially relevant where the enterprise value is derived using EBITDA multiples or a DCF model and the parties need a mechanism to translate enterprise value into equity value. The mechanism is designed to ensure the buyer acquires a business with a defined level of operating capital, not simply whatever cash happens to remain in the company on settlement.

What is a locked-box mechanism?

Under a locked-box structure, the price is generally fixed by reference to a historic balance sheet date, the locked-box date. The seller typically gives warranties and undertakings that value leakage will not occur between the locked-box date and completion, other than agreed permitted items. If the business performs as expected, the agreed price remains fixed and no completion accounts adjustment is made.

For a valuer, locked-box pricing is closely tied to the quality of due diligence and the reliability of historical financial information. It can suit businesses with stable earnings, strong controls and predictable cash flows, particularly where recurring revenue, low churn and clear working capital patterns support confidence in the agreed value.

Why the Mechanism Matters to Valuation Outcomes

At first glance, these mechanisms may look like a legal or accounting detail. In valuation terms, they are much more than that. They determine whether the buyer or seller bears the economic risk of movements in earnings, working capital and cash balances between pricing and completion.

For example, a business valued at 5.5 times EBITDA is usually being valued on a debt-free, cash-free basis or some variation of that approach. If the seller extracts cash before completion or if the business requires more working capital than assumed, the implied equity value changes. Completion accounts and locked-box are the tools that convert a theoretical enterprise value into a final purchase price that reflects the actual transaction position.

That distinction is particularly important in privately held businesses, where financial reporting may need normalisation. A valuer may need to adjust for owner’s discretionary expenses, related-party charges, one-off income, underpaid wages, non-commercial rent, or unusual inventory levels before applying a multiple or building a DCF. If the price mechanism does not align with those normalised assumptions, disputes can arise after signing.

How Each Mechanism Interacts with Core Valuation Methods

EBITDA and SDE multiples

In many Australian transactions, especially small to medium-sized private businesses, valuation is benchmarked using EBITDA or seller’s discretionary earnings (SDE) multiples. The chosen mechanism influences how much of the value is truly locked in at signing.

Where completion accounts are used, buyers often prefer comfort that normal working capital will be delivered at completion. This is common in businesses where the EBITDA multiple alone does not capture seasonal cash demands, inventory requirements or debtor collection risk. A retailer, distributor or trades business may show strong profits, yet still need meaningful working capital to operate.

Where locked-box is used, the seller may prefer certainty, as it reduces post-completion price recalculation. That can be attractive where margins are stable and the business has strong quality of earnings, such as certain professional services, software, healthcare services and subscription-based models.

DCF valuation considerations

In a DCF valuation, the forecast cash flows already reflect expected working capital requirements, capital expenditure and growth. A locked-box structure can complement a DCF-based price where forecasts are robust and the buy-side has confidence in the assumptions. Completion accounts may still be used, however, to ensure the balance sheet at completion aligns with the forecasted assumptions embedded in the valuation model.

The valuer should consider whether the valuation premise is consistent with the transaction mechanics. A DCF using forecast free cash flow assumes a level of operational normality. If the pricing mechanism allows for post-completion balance sheet changes, the valuer must be careful not to double count or omit adjustments for cash, debt and working capital.

Revenue multiple and recurring revenue businesses

For businesses valued on revenue, ARR or subscription metrics, the final consideration can still be affected by the pricing mechanism. High retention and low churn support more certainty in a locked-box structure, especially where net revenue retention is strong and collections are stable. In contrast, a business with volatile customer demand, project timing issues or receivables concentration may be better suited to completion accounts.

In recurring-revenue businesses, the practical issue is often whether the forecast pipeline and deferred revenue position at signing will still be intact at completion. A locked-box gives the seller more certainty over price, but it requires strong protections against leakage and a high degree of trust in the agreed historic figures.

Australian Transaction Context: Tax, GST and Private Company Issues

Australian business owners should not look at completion accounts or locked-box in isolation from tax and structuring issues. The final proceeds from a sale can be affected by CGT, the small business CGT concessions, the 15-year exemption and active asset rules, and the treatment of any earn-out or deferred consideration. Where private company loans are involved, Division 7A can also influence the net benefit of the transaction if shareholder or associate accounts are not settled correctly.

GST treatment is another critical issue. In some transactions, the sale of a going concern may be GST-free if the statutory requirements are met, but the contractual pricing mechanism must still be consistent with the broader transaction structure. A valuation engagement should not provide tax advice, yet a business valuer must understand how tax settings can influence market value and the seller’s net economic position.

Another emerging valuation issue for Australian owners is Division 296. This superannuation tax commenced on 1 July 2026 and applies a personal tax to the individual, not to the fund. It taxes realised earnings only, not unrealised gains under the final law, and the $3 million and $10 million thresholds are indexed. First assessments are issued in the 2027-28 year for the 2026-27 financial year. Where an SMSF holds business assets, business real property or shares in a privately held company, current market valuations are required for Division 296 purposes, including where an optional cost base reset to market value as at 30 June 2026 is relevant. That creates a direct need for professional valuation support.

When Completion Accounts Are Usually Preferred

Completion accounts are often the better fit where there is meaningful uncertainty in the balance sheet or operating capital position. Businesses with seasonal trading, material inventory, irregular debtor collections, or significant project-based revenue often fall into this category.

Buyers also tend to prefer completion accounts when they want price protection against losses in value between signing and settlement. The mechanism can help ensure the buyer only pays for the net assets actually delivered, which is particularly important when a business has debt-like items, contingent liabilities or closely held working capital assumptions.

From a valuation standpoint, completion accounts can provide a cleaner reconciliation between an enterprise value derived from market multiples and the final equity value paid at completion. They are also more common where the buyer is applying a more conservative discount for lack of marketability or control, especially in minority transactions or where the business lacks a broad underlying market for ownership interests.

When a Locked-Box Is Usually Preferred

Locked-box pricing is generally favoured when the business has predictable cash flows, strong management accounts and low risk of value leakage. Sellers often prefer it because it offers price certainty and reduces the administrative burden and negotiation risk associated with post-completion adjustments.

It can also be effective where the business valuation is well supported by comparable transactions, stable EBITDA margins and a robust normalisation process. For example, if a buyer and seller agree that the target business is worth 6 times normalised EBITDA, and the locked-box date financials are reliable, fixing the price at signing can accelerate completion and reduce disputes.

That said, locked-box works best when the seller’s undertakings are credible and there is no expectation that value will leak out of the business before completion. If there is likely to be significant cash extraction, related-party payments or unusual distributions, the mechanism can become contentious and may reduce the effective price.

Common Mistakes Business Owners Make

One common mistake is focusing only on the headline valuation multiple and ignoring the pricing mechanism. A 5 times EBITDA deal with completion accounts may produce a very different outcome from the same headline multiple under a locked-box structure, depending on debt, cash, working capital and leakage.

Another mistake is misunderstanding normalised working capital. Buyers often expect a target level based on historical averages, and sellers may assume that all cash generated before completion belongs to them. In reality, the agreed mechanism will determine how much of that value is retained in the business and how much is paid out before settlement.

A further issue is the use of incomplete or unaudited financial information. Under APES 225 Valuation Services, the scope of a valuation engagement matters. A full valuation engagement, a limited scope valuation engagement and a calculation engagement each require different levels of investigation and procedures. Where transaction pricing depends on precise balance sheet mechanics, the scope must be clearly defined so that the valuation report reflects the assumptions, limitations and evidence relied upon.

Conclusion: Matching the Pricing Mechanism to the Value Story

Completion accounts and locked-box are not just settlement mechanics, they are valuation mechanisms that shape the economic outcome of a deal. For Australian business owners, the right structure depends on the quality of earnings, the reliability of financial reporting, the volatility of working capital, the tax position and the degree of price certainty each party wants. A well-supported valuation should explain how enterprise value converts to equity value, how normalisations are treated, and how the pricing mechanism may affect final proceeds.

If you are considering a sale, succession event or restructuring, a professional business valuation can help you understand not only what your business is worth, but how the deal terms may change what you actually receive. To discuss your circumstances confidentially, contact InteleK Business Valuations & Advisory for a tailored valuation consultation.