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№ 77 Family Law

How to Vary a Separation Agreement in British Columbia

Find out whether and how a separation agreement can be changed or challenged in British Columbia, including child support, parenting and spousal support terms.

Family Law5 min readTSLBy the Treadstone Law Team · British ColumbiaUpdated November 1, 2026
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Key takeaways
  • A family law agreement is binding whether or not it was filed with a court, and a new written agreement can change parts of it.
  • Parenting and contact terms are only valid to the extent they serve the child's best interests.
  • A witnessed spousal support agreement can be set aside in limited situations, such as non-disclosure or a lack of understanding.

Life rarely stays the same after separation. Incomes change, a child's needs shift, someone moves or remarries. You may be wondering whether the agreement you signed is stuck in place, or whether it can be updated.

In British Columbia the answer depends on which part of the agreement you mean and whether it has been turned into a court order. This article walks through the main routes.

This article covers the law of British Columbia.

How binding is a separation agreement?

A family law agreement is binding on the parties, subject to the Family Law Act, whether or not it was filed with a court. A court can also incorporate a written agreement into an order. That second point matters, because an order is changed through a different process than an agreement.

You cannot usually just ignore a term you no longer like. The practical question is which route fits: agreeing a change together, asking a court to change an order, or asking a court to set an agreement aside.

Changing it by agreement

The simplest route is for both of you to sign a new written agreement. A new agreement that changes a previous one revokes each changed part of the earlier agreement, and the unchanged remainder stays effective. That means you can amend only the terms that need updating.

Because the terms are meant to last, it is worth having each person get legal advice before signing, and being open about income and assets.

Different terms, different rules

Type of termWhat the law says
Child supportAn agreement is binding only if made after separation, or when the parties are about to separate and intend it to take effect on separation. Amounts are determined under the child support guidelines, and a court can depart only in limited cases with reasons.
Parenting and contactValid only to the extent it serves the child's best interests. A contact agreement must be set aside or replaced if the court is satisfied it is not in the child's best interests.
Spousal supportA witnessed agreement can be set aside if, for example, a spouse failed to disclose income or significant property or did not understand it. A court may also set it aside if significantly unfair, considering factors such as time elapsed and changed circumstances.

Property and debt terms follow their own rules, and whether and how they can be reopened depends on the facts. A lawyer can tell you what applies to your agreement.

When a court gets involved

If your terms are now a court order, a court may change, suspend or terminate it when there has been a change in circumstances since it was made. The test differs by subject.

Some situations have their own rules. Contact orders for people who are not guardians, such as grandparents, are changed under section 60 of the Family Law Act, which uses the same test as section 47: a change in the needs or circumstances of the child. A prohibition on relocation is not, by itself, a change in circumstances for the purposes of section 47. Interim orders can be changed on proof of a change in circumstances or new substantial evidence.

If your order was made under the federal Divorce Act, variation is under section 17 of that Act rather than the Family Law Act. For parenting and contact orders the court must find a change in the circumstances of the child, and it cannot consider conduct that could not have been considered when the original order was made. A former spouse's terminal illness or critical condition counts as a change in the child's circumstances.

Under the Divorce Act, a non-spouse parent, a person standing in the place of a parent or a person intending to do so may apply to vary a parenting order, and a person who is not a spouse needs leave of the court if the order does not relate to them. Child support variation requires a change of circumstances as provided for in the applicable guidelines, and spousal support variation requires a change in the condition, means, needs or other circumstances of either former spouse.

Once a fixed-term or event-based spousal support order has ended, support can be resumed only if the applicant proves economic hardship and that the changed circumstances would likely have produced a different order. A Family Maintenance Enforcement Act proceeding is not itself a way to change support.

What to do next

Frequently asked questions

Can I change my separation agreement without going to court?

Yes, if both of you agree. A new written agreement revokes each changed part of the earlier one, and the rest stays effective.

Can an agreement about the children be overridden?

Parenting agreements are valid only to the extent they serve the child's best interests, and a contact agreement must be set aside or replaced if it does not. The court looks at the child's needs and circumstances.

Can I challenge a spousal support agreement I regret?

A witnessed agreement can be set aside in some situations, such as undisclosed income or property or a lack of understanding. A court may also set it aside if it is significantly unfair.

Do I stop paying while I try to change it?

Not on your own. Child support under an order continues until a court changes, suspends or terminates it, and a payor cannot end it by their own decision. A payor who applies promptly to change support may get a retroactive reduction of arrears, while one who waits risks arrears and interest continuing to accumulate. How this applies to other kinds of support 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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