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Earnouts are a common feature of Australian private business transactions, and they matter directly to valuation because they shift part of the price from completion to future performance. In practice, an earnout can reduce the gap between buyer and seller expectations, but it also introduces valuation uncertainty, tax complexity, and post-deal dispute risk. For business owners, the key issue is not just how an earnout is drafted, but how it affects the underlying business valuation, the allocation of risk, and the evidence needed if a dispute later arises.

What an earnout means in a business valuation context

An earnout is a contractual mechanism where part of the purchase price depends on the target business achieving agreed financial or operational milestones after completion. Those milestones may be measured by EBITDA, revenue, gross profit, new customer numbers, recurring revenue, or other metrics tied to the business model. From a valuation perspective, an earnout is not simply deferred payment. It is contingent consideration, and its value depends on the probability that the targets will be met, the timing of payment, and the buyer’s and seller’s ability to influence the result.

For a valuer, the presence of an earnout changes the analysis in several ways. First, it can affect the effective transaction multiple. A headline price based on, say, 6.0 times EBITDA may be materially lower in present value terms if a significant portion is contingent on future performance. Second, the metric used in the earnout must be assessed for valuation integrity. EBITDA, SDE, revenue, ARR, or gross profit each respond differently to normalisation adjustments, working capital assumptions, and accounting policy choices. Third, any earnout can create behavioural risk, particularly where the buyer controls the business post-completion and can influence the metric through staffing, capex, pricing, customer retention, or intercompany charges.

Why earnout structure matters to buyers and sellers

Earnouts are often used when there is a difference between what the seller believes the business is worth and what the buyer is prepared to pay upfront. They are also common where growth is recent, financial records are not yet long enough to support a full multiple, or a business depends heavily on the original owner remaining involved for a period after completion. In Australian private market deals, these circumstances are common across professional services, software, healthcare, trades, distribution, and niche manufacturing.

From a valuation engagement perspective, the earnout should be viewed as part of the total consideration package. A seller may be offered a lower upfront payment plus a contingent amount if revenue or EBITDA targets are achieved. In valuation terms, the seller must assess the expected present value of the total package, not just the face value of the earnout. That means examining the probability-weighted outcomes, discounting future payments for time and risk, and considering whether the buyer’s operating decisions could alter the result.

Buyers, meanwhile, use earnouts to protect against overpaying for growth that may not continue. This is especially relevant in sectors where ARR growth, retention, and expansion revenue drive valuation. For example, a software business may trade on a revenue multiple or ARR multiple only if net revenue retention remains strong and churn remains low. If that performance can be measured post-completion, an earnout may bridge the gap between current trading and forward projections.

Common earnout metrics and what they mean for valuation

EBITDA and profit-based earnouts

EBITDA is a frequent earnout metric because it is familiar, widely understood, and often correlates with enterprise value. However, it is also one of the easiest metrics to dispute if normalisation is not tightly defined. Add-backs, owner salaries, related party charges, and one-off expenses must be identified with precision. If the business has been valued on a maintainable EBITDA basis, the earnout should align with the same definition, or the transaction may become internally inconsistent.

For smaller private businesses, SDE can be more meaningful than EBITDA because it captures the owner’s actual economic benefit. Where the earnout is based on profit, the valuation analyst should test whether the chosen metric matches the business’s scale and operating structure. A profit-based earnout with open-ended discretion around overhead allocation often becomes a dispute waiting to happen.

Revenue, ARR, and customer metrics

Revenue-based earnouts are common where the business is growing quickly or where earnings lag revenue due to investment in customer acquisition. This is particularly relevant in subscription businesses, SaaS, service contracts, and other recurring-revenue models. Here, the valuation lens must include churn, retained business, cohort performance, and NRR. A business with strong revenue growth but weak NRR may not justify the same multiple as a business with slower top-line growth but superior retention.

When ARR is used, the definition must be precise. Is it contracted recurring revenue, invoiced recurring revenue, or forecast run-rate revenue? Is the metric gross or net of cancellations, discounts, and paused accounts? These definitions matter because even small drafting differences can materially affect the contingent value of the earnout.

Gross profit and operational milestones

Gross profit earnouts can be useful where the cost of goods sold is stable and measurable, but they still require careful drafting. A buyer may alter supply chain arrangements, pricing, or fulfilment methods post-completion, changing the metric without changing the underlying
market demand. Operational earnouts, such as customer retention targets or project completion milestones, may suit highly specialised businesses, but they are often harder to verify and value with confidence.

How a valuer would assess an earnout in a valuation engagement

Under APES 225 Valuation Services, the scope of the engagement matters. A full valuation engagement may be required where the earnout has material significance to value or a dispute is likely. In some circumstances, a limited scope valuation engagement may be appropriate if the issue is narrow, such as testing the reasonableness of an earnout formula. A calculation engagement may suit a more limited task where the parties agree on the methodology and key assumptions. The right scope depends on the purpose, the level of evidence required, and the possibility of later challenge.

The valuation process typically considers five questions. What is the expected payment under each scenario? How likely is each scenario? What discount rate reflects the time value of money and the specific risk of non-payment? Can the buyer or seller influence the metric? And does the earnout align with a market-based price outcome, or does it produce a distorted result when compared with comparable transactions?

Where the business is sold on a multiple basis, the valuer may need to compare the earnout against precedent transactions for similar Australian businesses. In some sectors, the earnout may effectively substitute for a higher multiple, while in others it functions more like a performance incentive. The valuation should also consider whether any discounts for lack of marketability or control are already embedded in the transaction structure, especially where the seller retains an equity stake or deferred participation.

Australian tax and regulatory considerations

For Australian business owners, the tax treatment of earnouts must be considered alongside valuation. The ATO’s treatment of earnout rights can be complex, particularly where the arrangement is a genuine right to additional capital proceeds rather than a separate revenue stream. This affects the timing and character of gains for CGT purposes, and the drafting of the sale contract is critical. If the business sale is structured as a going concern, GST treatment must also be reviewed carefully, because the earnout may form part of the broader sale consideration.

The interaction with the small business CGT concessions is another valuation-sensitive issue. The 15-year exemption, the active asset test, and related eligibility rules can influence a seller’s after-tax outcome significantly. That does not change the business valuation itself, but it can affect how the seller views the certainty of upfront versus contingent consideration. A seller may be willing to accept more contingent value if the overall after-tax position remains favourable.

Earnouts can also intersect with Division 7A where a private company structure, shareholder funding, or post-sale payments are involved. This is not a valuation issue in isolation, but it can materially affect the cash flows that support the transaction and therefore the valuation outcome. Careful structuring and accounting review are essential.

There is also a growing valuation relevance from Division 296, which commenced on 1 July 2026. The tax applies to realised earnings only, with the extra impost applying to earnings attributable to a member’s Total Superannuation Balance between $3 million and $10 million, and above $10 million. The thresholds are indexed, the tax is personal to the individual rather than the fund, and first assessments are issued in the 2027-28 year for the 2026-27 financial year. For owners using SMSFs that hold business assets, business real property, or shares in private companies, current market valuations are essential, including where a cost base reset to market value at 30 June 2026 is being considered. That is a direct reason many owners require a professional valuation.

How to avoid post-deal disputes

Most earnout disputes arise from ambiguity, not from the concept itself. The first safeguard is a precise definition of the metric, supported by examples and worked calculations. If EBITDA is used, the contract should specify the treatment of owner remuneration, related party charges, normalisation adjustments, and capital expenditure policies. If revenue or ARR is used, the contract should define recognised revenue, cancellations, renewals, and deferred income treatment.

The second safeguard is governance. The party controlling the business after completion should have clear obligations to operate it in good faith and consistently with past practice, especially where its decisions affect the earnout metric. Reporting timeframes, access to records, audit rights, and dispute resolution procedures should all be set out in advance.

The third safeguard is valuation evidence. Before completion, both parties should test whether the earnout formula produces outcomes that are commercially sensible under conservative, base case, and upside case scenarios. A robust valuation can identify where the structure is likely to fail, whether the discount rate is appropriate, and whether the earnout is effectively loading too much risk onto one side.

Practical valuation lessons for Australian business owners

Earnouts are neither inherently good nor inherently bad. They are tools for bridging valuation gaps, but they only work if the underlying business is measured properly and the contract matches the economics of the deal. In the Australian market, where many private businesses are owner-managed and dependent on a small number of relationships, the risk of disputed post-completion adjustments is real.

For sellers, the key valuation question is whether the earnout really preserves value or merely defers uncertain consideration. For buyers, the question is whether the structure fairly prices the risk of future performance without creating incentives to manipulate results. In both cases, a defensible valuation can make the difference between a smooth transaction and an expensive dispute.

If you are considering an earnout, or if a completed transaction is now disputed, a properly scoped valuation engagement can provide the evidence needed to assess fair value, contractual performance, and post-deal entitlement. InteleK Business Valuations & Advisory assists Australian business owners with confidential, independent valuation services tailored to private business transactions, tax matters, and dispute support. To discuss your circumstances, schedule a confidential valuation consultation with InteleK Business Valuations & Advisory.