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№ 77 Family Law

Can a Prenup Protect a Family Business or Inheritance in BC?

See how a BC prenup or marital agreement can keep a business or inheritance out of property division, and what can still let a court set it aside.

Family Law5 min readTSLBy the Treadstone Law Team · British ColumbiaUpdated November 6, 2026
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Key takeaways
  • Spouses can agree to exclude items such as a business or home from family property, or to include items that would not otherwise be included.
  • The agreement must be in writing and signed, and the strongest protection comes when each signature is witnessed.
  • A court can still set aside part or all of an agreement for non-disclosure, vulnerability, misunderstanding or if it is significantly unfair.

If you own a business, hold an interest in a family company, or expect an inheritance, it is natural to wonder what would happen to it if your relationship ended. Many people look to a prenup, hoping to keep that asset out of any division.

In British Columbia, the Family Law Act does allow spouses to make agreements about property and debt, but how well the agreement holds up depends on how it is made and what it says. This article explains the basics. It is general information, and anyone with significant assets should get legal advice before signing.

This article covers the law of British Columbia.

The starting point without an agreement

Under the Family Law Act, spouses are presumptively entitled to family property and responsible for family debt. On separation, each has a right to an undivided half interest in family property as a tenant in common. That rule is expressly subject to an agreement or order that provides otherwise.

Which of your assets count as family property in a particular case depends on the facts. That is exactly why people use agreements: to replace uncertainty with a clear plan that both of you have accepted.

What a property agreement can do

Section 92 lets spouses make agreements about the division of property and debt despite the property rules in Part 5, subject to the court's power to set them aside. Within that, the Act specifically contemplates several useful terms.

Notice that an agreement can work in both directions. You might exclude a business from division, or you might agree that an inheritance will be shared. Both are choices the Act allows.

Making the agreement hold up

A written agreement is one in writing that is signed by all parties. The court's set-aside regime applies to a written agreement with the signature of each spouse witnessed by at least one other person, and the same person may witness both signatures. The Act does not require notarization, a commissioner or a lawyer's signature. An unwitnessed signed agreement is not automatically void, but it is not clearly within the protected regime.

A court may set aside or replace all or part of a witnessed agreement only if one of the listed circumstances existed when it was made. These are the areas where careful preparation helps most.

Ground to set asideWhat it means in practice
Failure to discloseA spouse did not disclose significant property or debts, or other information relevant to the negotiation. Full disclosure of the business and its value protects the agreement.
Improper advantage of vulnerabilityA spouse took advantage of the other's ignorance, need or distress. Signing well before the wedding with time to think helps.
Not understanding the agreementA spouse did not understand its nature or consequences. Plain wording and legal advice help show understanding.

The Act also allows a challenge on other circumstances that would make a contract voidable under the common law. Legal advice is not a condition of validity under these sections, but the Province's guidance advises it.

Limits and special situations

Even if no listed circumstance existed, the Supreme Court may set aside or replace all or part of a property agreement that is significantly unfair. It looks at how long ago the agreement was made, whether the spouses intended certainty, and how much they relied on its terms. The court may also decline to act if it would not replace the agreement with an order substantially different from its terms.

Timing is flexible. Spouses who are already married may make a property agreement during the marriage, and it is subject to the same set-aside rules. For unmarried couples, the property rules apply only once they have lived in a marriage-like relationship for at least two years, and a written agreement can opt out of the default rules. Whether an agreement signed before you moved in together carries over after marriage depends on the facts and should be confirmed with a lawyer.

A prenup also cannot settle everything. Its parenting terms are not binding as such, and its child support terms are not binding as such either.

What to do next

Frequently asked questions

Does an inheritance automatically stay out of property division?

Whether it does depends on the facts and the type of asset, so confirm with a lawyer. What the Act does say is that spouses can agree to exclude items from family property or to include items such as an inheritance that would not otherwise be included.

Do we need lawyers for a BC prenup?

The Act does not require a lawyer's signature or independent legal advice for validity. Still, the Province advises getting legal advice, and a lack of understanding or disclosure can give grounds to set an agreement aside.

Do the signatures have to be witnessed?

The agreement must be in writing and signed by both of you. The set-aside regime applies where each signature is witnessed by at least one person, and the same person can witness both.

Can we sign after we are already married?

Yes. Because the Act speaks of spouses making agreements, spouses already married may make a property agreement during the marriage, subject to the same set-aside rules.

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. British Columbia 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 lawyer who practises in British Columbia. Reach us at 1-844-900-1070 or send our Team a message.

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