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№ 77 Family Law

Can a Prenup Waive Spousal Support in British Columbia?

Find out whether a British Columbia prenup can waive spousal support, how the court reviews the clause, and when it can still set the waiver aside.

Family Law4 min readTSLBy the Treadstone Law Team · British ColumbiaUpdated November 6, 2026
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Key takeaways
  • A spouse may agree to release the other from liability for spousal support, so a marriage agreement can include a waiver.
  • A witnessed written agreement generally stops the court from making a spousal support order unless the agreement is set aside.
  • The court can still set aside a waiver for non-disclosure, vulnerability or misunderstanding, or if it is significantly unfair.

Many people asking for a prenup want to give up, or limit, spousal support if the relationship ends. Others are asked to sign one and wonder whether a clause like that would really be enforced.

In British Columbia, the Family Law Act allows such clauses, but it also gives the court real power to review them. This article explains both sides. It is general information only, and the outcome in any case depends on the facts.

This article covers the law of British Columbia.

Yes, spousal support can be waived

Despite the duty to provide spousal support in section 160, a spouse may agree to release the other spouse from liability for spousal support. So a marriage agreement can waive spousal support.

An agreement does not have to be all-or-nothing. It may also provide for the circumstances under which spousal support will change or end. One condition is not binding, however: a requirement that the spouse abstain from sexual relations after separation.

How a witnessed agreement is treated

The set-aside regime for spousal support agreements applies to a written agreement with each spouse's signature witnessed by at least one person, and the same person may witness both signatures. The court may not make a spousal support order if the spouses have such a witnessed agreement, unless all or part of it is set aside.

A written spousal support agreement filed in the court is also enforceable under the Act as if it were a court order. If an agreement is signed but not witnessed, it is not automatically void, because the court may apply the same review rules to it if appropriate in all the circumstances. It is simply less certain.

When a court can set the waiver aside

The court may set aside or replace a spousal support agreement only if one of these circumstances existed when it was made.

Even then, the court may decline to act if it would not replace the agreement with an order substantially different from its terms. Legal advice is not a condition of validity under these sections, but the Province advises getting it before final decisions. Skipping it can make the problems above, such as not understanding the agreement, easier to raise.

The significantly unfair test

Even if none of those circumstances existed, the court may set aside or replace a spousal support agreement, including a waiver, if it is significantly unfair. This matters for waivers because the world often changes after the signing. The court considers five factors: time that has passed, changes since the agreement in a spouse's condition, means, needs or other circumstances, the spouses' intention to achieve certainty, their reliance on its terms, and the degree to which the agreement meets the objectives in section 161.

Those objectives include recognizing economic advantages or disadvantages to the spouses, apportioning the financial consequences of child care, relieving economic hardship from the breakdown and, as far as practicable, promoting each spouse's economic self-sufficiency within a reasonable period.

For example, a waiver signed by two people with similar careers may look different many years later if one of them left work to raise children. Whether that would be significantly unfair is a question for the court on the full facts.

Child support and parenting are different

A prenup cannot settle everything about children. An agreement respecting child support is binding only if made after separation, or when the parties are about to separate for the purpose of being effective on separation, so a prenup's child support terms are not binding as such. Parenting terms follow a similar rule. Child support is determined under the child support guidelines.

What to do next

Frequently asked questions

Will a court always uphold a spousal support waiver?

Not always. The court can set one aside if there was non-disclosure, improper advantage of vulnerability, a lack of understanding or another common law ground. It can also act if the waiver is significantly unfair.

Does the waiver need to be witnessed?

The set-aside regime applies to an agreement with each signature witnessed by at least one person, and one person can witness both. An unwitnessed agreement is not automatically void, but the court has discretion on how to treat it.

Can a prenup waive child support too?

No, not in a binding way. A child support agreement is binding only if made after separation or when the parties are about to separate. The court can also set aside or replace a child support agreement if it would make a different order.

Does this apply to unmarried couples?

A person is a spouse under the Family Law Act if married, or if they have lived in a marriage-like relationship for a continuous period of at least 2 years. Having a child with the other person can also make someone a spouse, except in Parts 5 and 6. How this applies to you depends on your situation, so it is worth confirming with a lawyer.

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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