Child Support
Do Step-Parents Have to Pay Child Support in BC?
By SiLaw Group Family LawyersPublished Nov 13, 2026 · 6 min read
Under section 147(4) of the Family Law Act, a step-parent has no duty to support a stepchild unless they contributed to the child's support for at least one year and a claim is started within one year after their last contribution. The duty is secondary to the parents' own.
SiLaw Group Family Lawyers hears this question from both directions: from a parent whose former partner helped raise a child for years, and from a step-parent who is surprised to be named in a support claim. This post is about the money. For guardianship and contact questions in a blended family, see our page on step-parents and blended families. For how any child support figure is built, see how child support is calculated in BC.
Who Counts as a Step-Parent Under the Family Law Act?
Section 146 of the Family Law Act defines the term for the purposes of child and spousal support. The Act spells it "stepparent" and means a person who is a spouse of the child's parent and lived with the child's parent and the child during the child's life. The same section says that "parent" includes a stepparent if the stepparent has a duty to provide for the child under section 147(4) of the Act.
Under section 3(1) of the Family Law Act, a spouse is a person who is married, or who has lived with another person in a marriage-like relationship for a continuous period of at least two years, or, for purposes other than property and pension division, who has lived in a marriage-like relationship with that person and has a child with them. So a partner who never married the child's parent but lived with the parent and child for two or more years meets the definition. Our page on the two-year rule for common-law couples explains how that period is measured.
When Does a Step-Parent's Duty to Pay Arise?
Section 147(1) of the Family Law Act places the duty to support a child on each parent and guardian. Section 147(4) of the Act then sets two conditions before a step-parent shares in it, and both must be met:
- the step-parent contributed to the support of the child for at least one year, and
- a proceeding for a support order against the step-parent is started within one year after the date the step-parent last contributed to the support of the child.
The section does not define "contributed", so the evidence of how the household was actually funded matters: who paid the rent or mortgage, groceries, activities, and school costs, and for how long. The second condition is a deadline. The clock runs from the date of the last contribution, not from the date the adults separated.
How Far Does the Duty Extend?
A step-parent who meets the two conditions does not step into the shoes of a parent. Section 147(5) of the Family Law Act says the step-parent's duty is secondary to that of the child's parents and guardians, and extends only as appropriate on consideration of two things: the standard of living experienced by the child during the relationship between the step-parent and the step-parent's spouse, and the length of time during which the child lived with the step-parent. The British Columbia government's child support pages restate both limits in plain language.
The parents' obligations are not displaced. Section 149(4) of the Family Law Act says the making of an order against one person for the support of a child does not affect the liability of, or prevent an order against, any other person responsible for the child's support. A step-parent's contribution is added to, and ranks behind, what the child's own parents owe.
Can a Court Order a Step-Parent to Pay While the Couple Is Still Together?
No. Section 149(3) of the Family Law Act allows a child support order against a step-parent only if the step-parent has a duty under section 147(4) of the Act and the step-parent and the child's parent are separated.
How Is a Step-Parent's Child Support Amount Calculated?
Section 150(1) of the Family Law Act requires a court making a child support order to determine the amount in accordance with the child support guidelines. The starting reference is therefore the table amount for the step-parent's income and the number of children, which you can read from the official Department of Justice look-up through our BC child support table lookup. But section 150(1) has to be read together with section 147(5) of the same Act, which limits the duty to what is appropriate given the household's standard of living and the time the child lived with the step-parent, and makes it secondary to the parents' duty. The table figure is where the analysis begins, not where it has to end. Section 150(5) of the Act requires the court to give reasons if it orders an amount different from the guidelines.
Married step-parents may also face a claim under the Divorce Act. Section 2(2)(b) of the Divorce Act says a "child of the marriage" includes any child of whom one spouse is the parent and for whom the other stands in the place of a parent. For that situation, section 5 of the Federal Child Support Guidelines says the amount of the step-parent's child support is such amount as the court considers appropriate, having regard to the Guidelines and to any other parent's legal duty to support the child. Both the provincial and the federal routes keep the biological parent's duty in view when setting a step-parent's number. Special or extraordinary expenses under section 7 of the Guidelines can form part of the discussion, and financial disclosure from the parents and the step-parent will be needed. Our Form F8 financial disclosure guide explains what that involves.
Can Parents and Step-Parents Settle This in an Agreement?
Only at the right time. Section 148(1) of the Family Law Act says an agreement respecting child support is binding only if it is made after separation, or when the parties are about to separate for the purpose of being effective on separation. A cohabitation agreement signed in the middle of a happy relationship cannot lock in, or waive, child support for a stepchild. After separation, a separation agreement can record what the step-parent will contribute, and under section 148(2) of the Act a written agreement filed in court is enforceable as if it were an order. Section 148(3) of the Act lets the court set aside or replace all or part of such an agreement if it would make a different order on the matters in section 150.
What If the Step-Parent Has Children of Their Own?
A step-parent asked to contribute may already be supporting children from another relationship. Section 10(2) of the Federal Child Support Guidelines lists, among the circumstances that may cause undue hardship, a legal duty to support a child other than a child of the marriage who is under the age of majority or unable to obtain the necessaries of life. Whether that opens the door depends on the household comparison the section also requires. Our page on undue hardship claims explains the two-step test.
What Should You Do Now?
If you are a parent, note the date your former partner last contributed and get advice well before a year passes. If you are a step-parent, gather records of what you paid and when, because the existence and the size of any duty turn on those facts.
Talk to a Family Lawyer About Step-Parent Child Support
We can tell you whether a duty exists on your facts, how large it is likely to be, and what the one-year deadline means for you. The first 30 minutes with SiLaw Group are free, by phone, video, or in person in South Surrey. Call (778) 381-9977 or Book Now for a Free Consultation.
This post is legal information, not legal advice. Rules and fees are current to the date of writing and can change.
About SiLaw Group
SiLaw Group Family Lawyers is a Surrey, BC firm practising family law and mediation. Founder Sandy Sihota is an accredited Family Law Mediator, Arbitrator and Parenting Coordinator (Law Society of BC). Articles are legal information, not legal advice.