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№ 77 Family Law

Does a BC Prenup Still Apply If We Separate After Many Years?

Learn how British Columbia courts treat an older marriage agreement after children, career changes and years pass, and when it can be set aside or replaced.

Family Law5 min readTSLBy the Treadstone Law Team · British ColumbiaUpdated November 13, 2026
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Key takeaways
  • Time passing is one factor a BC court weighs when asked whether a property agreement is significantly unfair.
  • Spousal support agreements, including waivers, can be reviewed for significant unfairness, with attention to changes in a spouse's condition, means and needs.
  • Child support and parenting terms in an older agreement are not binding unless made after separation or when the parties are about to separate.

You signed a marriage agreement years ago. Since then you may have had children, changed careers, moved or built or lost a business, and now you wonder whether the agreement still holds.

This article explains what the BC Family Law Act says about how time and changed circumstances affect an agreement between spouses. How a court would apply these rules to your situation depends on the facts, so a lawyer can confirm where you stand.

This article covers the law of British Columbia.

Does an agreement simply expire?

The Family Law Act lets spouses make agreements about dividing property and debt despite the default rules, and the default rules apply only subject to an agreement or order that provides otherwise. The length of time since the agreement was made is one factor the Supreme Court considers when deciding whether a property agreement is significantly unfair.

How long ago you signed can matter when someone asks the court to set the agreement aside. Whether any time limits apply to your agreement or to an application about it depends on your situation, so it is worth confirming with a lawyer.

Property: what the court can look at

For a witnessed written property agreement, the Supreme Court may set aside or replace all or part of it only if one of the listed circumstances existed when it was made. These are the grounds:

Notice that these grounds look back to the time of signing. Later events such as children or a career shift are not on that list.

There is a second route. Even if none of those circumstances existed, the court may set aside or replace all or part of a property agreement if it is significantly unfair. For property agreements the court considers the length of time since the agreement was made, the spouses' intention to achieve certainty, and how much they relied on its terms.

Even when a ground is proven, the court can decline to act if it would not replace the agreement with an order substantially different from its terms.

Spousal support: changes matter more

An agreement may provide the circumstances under which spousal support will change or end, and a spouse may agree to release the other from spousal support. If the agreement is written and each signature is witnessed, the court may not make a spousal support order unless all or part of the agreement is set aside.

However, the court may set aside or replace a spousal support agreement, including a waiver, if it is significantly unfair, even if no problem existed at signing. For spousal support the court considers:

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. Years of child care or a career sacrificed for the family are the kind of changes that can bear on these factors.

Children: older terms are not binding

An agreement about 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. The same limit applies to parenting arrangements. So child terms in an agreement signed years ago are not binding as such.

Child support is determined in accordance with the child support guidelines. The court may order a different amount if the parties consent or have an agreement and the court is satisfied that reasonable arrangements have been made for the child's support.

What to do next

Whether your agreement is likely to hold, and whether a challenge would succeed, depends on the facts. A lawyer can read the document with you and explain which parts are most likely to be tested.

Frequently asked questions

Does a prenup expire after a certain number of years?

The facts here do not say that a prenup expires, and how long you have to challenge or set aside an agreement depends on your situation. The two-year limit that applies to a court order about property division is a separate question: for unmarried couples it runs from the date of separation, and for married couples it runs from the divorce order. Whether any other limit applies to your situation is worth confirming with a lawyer. The length of time since the agreement was made is a factor when a court considers whether a property agreement is significantly unfair.

Can having children change my agreement?

Children do not automatically cancel it. Child support and parenting terms in a prenup are not binding as such, because an agreement on either is binding only if it is made after separation, or when the parties are about to separate and it is meant to take effect on separation. For spousal support, the court looks at changes in a spouse's condition, means and needs, and at the consequences of child care.

Can a spousal support waiver be undone?

A spouse may agree to release the other from spousal support. The court may still set aside or replace a spousal support agreement, including a waiver, if it is significantly unfair.

Do I need a lawyer to challenge an old agreement?

The Act does not make a lawyer a condition of validity. Because the tests turn on the facts, the Province's guidance advises getting legal advice before final decisions about property and debt.

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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