Earn-Outs: The Definitive Guide | IBV™

An earn-out is part of the purchase price that is paid later, only if the business meets agreed performance targets after the sale. Instead of the full price changing hands at completion, the buyer pays a base amount and the seller earns the rest over time.

Earn-outs exist because buyers and sellers often disagree about the future. The seller sees growth just around the corner; the buyer sees unproven forecasts. An earn-out converts that disagreement into a shared bet: if the growth arrives, the seller is paid for it; if it does not, the buyer never paid for earnings that never came.

This guide explains how earn-outs work in Australian business sales: how they are structured, what they mean for value, the risks on each side, how tax treats them, and what to settle before you sign. It is general information, not valuation, tax or legal advice for your circumstances.

Earn-outs are most common where future earnings are genuinely uncertain: a business that depends heavily on its departing owner, a short trading history, a major contract up for renewal, or a recent growth spurt the buyer is not yet willing to pay for in full. They also serve a second purpose—keeping the seller engaged through a transition period, because part of their money still depends on the business performing.

An earn-out is not always the right tool. If the gap between the parties is small, a price adjustment or a shorter negotiation may be simpler. The larger and longer the contingent component, the more the deal depends on definitions, trust and dispute mechanisms rather than on the business itself.

Every earn-out answers five questions, and the precision of the answers decides whether the arrangement works or ends in dispute.

The metric. Most earn-outs are tied to revenue, gross profit or EBITDA over the earn-out period. The metric must be defined precisely: which entity, which accounting policies, which normalisations, and how new costs introduced by the buyer are treated. Revenue is simple but can reward unprofitable growth; EBITDA aligns with value but gives the party controlling the accounts more room to argue.

The period. Commonly one to three years. Longer periods increase uncertainty for both sides and can affect tax treatment.

The formula. Thresholds, caps and the payment calculation, in writing, with worked examples attached to the agreement. A cap limits the buyer's exposure; a threshold ensures the seller is paid only for genuine performance.

Control. Who makes the decisions that move the metric—pricing, hiring, marketing spend, which entity wins new work? If the buyer controls the business, the seller is betting on someone else's decisions.

Disputes. Who calculates the metric, what information each party can see, and how disagreements are resolved—typically an independent accountant determination before any litigation.

A headline price is not the same as expected proceeds. A deal described as “$2.6 million” that pays $2.0 million at completion and up to $600,000 contingently is not the same as $2.6 million with certainty. The contingent part must be weighed by the probability of each outcome—and by the time value of money, because payments arrive later.

This cuts both ways. For the buyer, an earn-out shifts performance risk to the seller, which can justify a higher headline figure. For the seller, part of the price is now at risk and depends on decisions they may no longer control. When a business is valued in the context of an earn-out sale, the certain and contingent components should be distinguished, and the probabilities behind the contingent part made explicit rather than assumed.

An earn-out does not, by itself, change the underlying value of the business at the valuation date. It changes how consideration is structured and how performance and payment risks are allocated between buyer and seller. An independent valuation provides a benchmark against which the total transaction package can be assessed.

The seller's central risk is loss of control. After completion, the buyer makes the decisions that move the metric: costs can be loaded into the business, group overheads allocated to it, or new work directed to another entity the buyer owns. Integration decisions made for good reasons can still erode the earn-out. Customers or key staff may leave during the transition. And when the calculation is finally prepared, it is usually prepared by the buyer.

Common protections include precise metric definitions with fixed accounting policies, information and audit rights, covenants about how the business will be run during the period, acceleration of the earn-out if the buyer on-sells the business, and an independent determination process for disputes. None of these remove the risk; they price it more honestly. Australian M&A practitioners report that precise drafting and workable dispute mechanisms are where earn-outs most often succeed or fail.

The buyer's central risk is that the seller manages for the metric rather than the business—deferring maintenance, discounting to pull revenue forward, or avoiding investment whose payoff falls outside the period. The buyer may also end up paying for growth its own investment created, or discover that the seller's continued involvement was worth less than expected.

Common protections include caps on total payments, balanced metrics such as gross profit rather than raw revenue, covenants requiring the business to be run consistently with past practice, and retention terms that are separate from the earn-out itself.

Under ordinary CGT rules, the market value of an earn-out right may form part of the seller's capital proceeds at completion, potentially creating tax liabilities before the contingent payments are received. The earn-out right may then be treated as a separate CGT asset when payments are made or the right expires. Qualifying look-through earnout rights receive different treatment: the actual contingent payments adjust the capital proceeds of the original business sale, potentially requiring amendments to the original year's tax assessment.

Look-through treatment is available only where the statutory conditions are satisfied. These include the disposal of an active asset, arm's-length arrangements, genuinely uncertain future financial benefits linked to economic performance, and a payment period generally ending no later than five years after the end of the income year of disposal. Where contingent payments depend on the seller remaining employed or providing services, their tax treatment may differ from ordinary capital proceeds and should be separately assessed.

Which treatment applies, and what it means in dollars, depends on the arrangement and the law at the time. Confirm the position with your tax adviser before signing—the tax outcome can materially change which deal structure is actually better for you.

Banksia Wholesale is a fictional business. The parties agree on $2.0 million at completion plus an earn-out of up to $600,000 over two years, tied to normalised EBITDA targets. The seller's adviser assesses three scenarios:

The probability-weighted earn-out is $375,000, giving expected gross consideration of $2,375,000 before discounting and tax—not the $2,600,000 headline. The present value of future payments may be lower after allowing appropriately for timing and payment risk. Neither figure, on its own, establishes the independent market value of Banksia Wholesale.

• Is the metric defined precisely, with the accounting policies fixed for the whole period?
• Who controls the decisions that move the metric, and what covenants protect the arrangement?
• Are thresholds, caps and the payment formula in writing, with worked examples attached?
• What happens if the buyer sells the business, breaches the covenants, or disputes the calculation?
• Have you modelled the after-tax outcome of each scenario with your tax adviser?
• Do you have an independent value for the business to judge the whole package against?

An earn-out negotiation is easier when both sides start from an independent, evidence-based value for the business. IBV™ prepares independent business valuations that help owners and buyers judge the value behind the deal, including scenario analysis of contingent consideration. A valuation informs the negotiation; it does not replace legal or tax advice on the agreement itself. Purpose, scope, permitted users and the Fixed Professional Fee are confirmed in writing before work begins.

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