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Earn-Outs in an Ontario Business Purchase Explained

See how an earn-out ties part of the price to future results, where disputes arise and what buyers and sellers should settle in writing before signing.

Buying & Selling a Business6 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • An earn-out makes part of the purchase price depend on how the business performs after closing.
  • Most earn-out disputes come from unclear definitions, such as what counts as revenue or profit and who controls the business after closing.
  • Related rules still apply, including the allocation of the price for tax purposes and the criminal interest rate cap if the seller also lends part of the price.
  • Both sides should have the earn-out written precisely, with a lawyer and accountant involved before signing.

The buyer and seller cannot agree on what the business is worth. The seller points to strong growth, while the buyer sees risk. A common compromise is an earn-out: part of the price is paid at closing and the rest is paid later only if the business reaches agreed targets.

Earn-outs can bridge a gap, but they also keep the buyer and seller tied together after closing, and that is where trouble often starts. This article explains how earn-outs generally work, where disputes arise and what to settle in writing.

How an earn-out works

In an earn-out, the purchase agreement sets a payment, or several payments, that depend on future results. The measure might be revenue, gross profit, earnings or something else, such as keeping a key customer. There is usually a set period, with a calculation at the end of each year or at the end of the whole period.

For the seller, an earn-out is a chance of a higher price but also a risk of receiving less than hoped. For the buyer, it reduces the money paid upfront and shares the risk that the business does not perform. Neither side should treat it as a simple add-on. It is a continuing relationship that needs clear rules.

Where earn-out disputes come from

Disputes rarely arise because someone refuses to pay a clear number. They arise because the agreement leaves room to argue about how the number is reached. Common trouble spots include these.

What each side usually wants

IssueSeller's usual priorityBuyer's usual priority
CalculationA simple measure that is hard to manipulate, such as revenueA measure that reflects real profit
Operating freedomPromises to run the business in good faith and keep it separateFreedom to make normal business decisions
ReportingRegular reports and a right to review the booksLimits on access and confidentiality
Dispute processA quick, neutral way to resolve numbersAvoiding long and costly fights
Sale of the businessEarn-out accelerates or the new owner takes it onFlexibility to sell or restructure

There is no standard answer. The right balance depends on the size of the earn-out, the seller's role afterwards and how much trust there is between the parties.

Other rules that connect to an earn-out

An earn-out sits inside a larger purchase, so other rules still apply. Tax treatment of deferred or contingent payments can be complex, and your accountant should confirm it before you agree to the structure. A few connected points are worth raising.

What to do next

Whether you are the buyer or seller, put the earn-out in plain terms before the purchase agreement is signed. A short written example, with sample numbers and the calculation worked through, can prevent many arguments.

Frequently asked questions

Is an earn-out better for the buyer or the seller?

It depends on the deal. Buyers like it because less is paid upfront and the risk is shared, while sellers accept it to reach a higher possible price. It works best when the measure is clear and both sides can live with the conditions.

What happens if the buyer changes the business and the earn-out falls?

This is a common source of disputes. The answer depends on what the agreement says about how the buyer may operate the business. Sellers often ask for specific protections, and a lawyer can help draft them.

Can a seller have a non-compete as part of an earn-out deal?

Sometimes. The ESA has a sale-of-business exception where the seller becomes the buyer's employee and a non-compete is agreed as part of the sale. Whether your arrangement fits should be confirmed by a lawyer.

Can the seller lend part of the price along with an earn-out?

Yes, deals often combine them, but the interest rate must not exceed the criminal rate of interest, an annual percentage rate above 35 per cent on the credit advanced. Have a lawyer check the loan terms and any exemptions.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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