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Do I Need an NDA Before Sharing Business Details With Buyers in Ontario?

Find out how a confidentiality agreement protects your Ontario business sale, what privacy law requires for employee and customer data, and how to stage disclosure.

Buying & Selling a Business4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 13, 2026
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Key takeaways
  • A written confidentiality agreement is the normal first step before a buyer sees sensitive details about your business.
  • Where employee or customer personal information is shared, federal privacy law expects an agreement with specific protections.
  • Sharing information in stages limits the damage if a deal falls through.

If you are thinking of selling, you probably worry about employees leaving, customers hearing rumours and competitors using what they learn. A buyer cannot make a sensible offer without seeing real information, so you need a way to share it safely.

The usual tool is a non-disclosure agreement, often called an NDA or confidentiality agreement. This article explains what it does, what privacy law adds, and how to control the flow of information in an Ontario sale.

Why an NDA comes first

An NDA is a contract in which the buyer promises to keep what they learn private and to use it only to evaluate your business. Without one, you may have little to rely on if a prospective buyer shares your customer list or pricing with others.

It is worth signing before you hand over anything beyond basic, non-sensitive details. Many sellers start with a short summary that does not name the business, then require an NDA before sharing more.

What a good confidentiality agreement covers

The exact wording depends on your business and the buyer. A lawyer can tailor it, especially if the buyer is a competitor.

Employee and customer information: what privacy law adds

Employee and customer records contain personal information. Under federal privacy law, organizations may use and disclose personal information for a prospective business transaction without consent, but the parties must have an agreement that the recipient will use it solely for purposes related to the transaction, protect it with appropriate safeguards, and return or destroy it within a reasonable time if the deal does not proceed. The information must also be necessary to decide whether to proceed.

In practice, this means your NDA should include these privacy terms, and you should share only what the buyer truly needs at each stage. Names and salaries of every employee are rarely needed early in the process.

After closing, the parties may keep using and disclosing the personal information without consent if they agree to use it only for its original purposes, protect it and honour withdrawn consents. One of the parties must notify the individuals within a reasonable time that the transaction was completed and their information disclosed. This exemption does not apply where the primary purpose or result of the transaction is buying, selling, acquiring, disposing of or leasing personal information.

Staging disclosure to protect your business

StageWhat to shareProtection
Early interestAnonymous summary of the businessNo identifying details
After NDAFinancial overview and general operationsSigned confidentiality agreement
Serious offerContracts, employee and customer details as neededNDA with privacy terms and a written offer
Before closingFinal verificationConfirmed deal terms and access controls

Hold back the most sensitive material, such as customer names and key supplier terms, until the buyer is serious. If your buyer is a competitor, consider having an outside advisor review the most sensitive records instead of handing them over.

Talking to employees and what to do next

Many owners worry about when to tell staff. There is no one right answer, but it helps to know that if a buyer employs your employee after a sale, the sale does not end the employment, the buyer is treated as the employer, and the employee's service flows through for entitlements such as vacation and notice of termination. Prior service does not carry over if the buyer hires the employee more than 13 weeks after the earlier of the employee's last day with the seller or the day of the sale.

Frequently asked questions

Is an NDA legally required before I share information with a buyer?

A non-disclosure agreement (NDA) is not required for every sale, and how this applies depends on your situation, so it is worth confirming with a lawyer. However, where personal information is shared for a prospective transaction without consent, privacy law requires an agreement with specific protections. In any event, an NDA is the standard way to protect your business.

Can I share employee records during due diligence?

Yes, within limits. The information must be necessary to decide whether to proceed, and the recipient must agree to use it only for the transaction, protect it and return or destroy it if the deal fails.

What happens to personal information after the sale closes?

The parties may continue to use and disclose it if they agree to use it only for its original purposes, protect it and honour withdrawn consents. One party must notify the individuals within a reasonable time.

Does the privacy exemption apply to every deal?

No. It does not apply where the primary purpose or result of the transaction is buying, selling, acquiring, disposing of or leasing personal information. A lawyer can tell you whether your deal is affected.

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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