Here is something that catches a lot of Ontario parents completely off guard. The child turns 18. Maybe they just finished high school, maybe they are packing for university in September. And somewhere in the back of your mind you are thinking: okay, we are done here. Support ends. That is the law.
It is not, actually. And assuming it is can create a genuine mess. Child support for an adult child in Ontario does not stop automatically when a child reaches the age of majority. Whether it continues past 18 depends on whether the child is still dependent, and if they are still in school full-time, the answer is usually yes. This post walks through what that actually means in practice, whether child support continues and why, how the math changes, and what you need to do if you think the obligation should end.
The 18 Myth and Why It Trips People Up
A lot of parents treat age 18 as a finish line. When the child is 18 years of age or older, legally an adult, the assumption is that the child support obligation is over. It makes intuitive sense, but Ontario family law does not work that way.
Under Section 31(1) of the Family Law Act, the obligation to support a child does not disappear on a birthday. A parent must provide support for an unmarried child who is a minor, enrolled in a full-time program of education, or unable to obtain the necessaries of life on their own because of illness, disability, or other cause. The federal Divorce Act uses similar language for families whose separation falls under federal rather than provincial jurisdiction, referring to a child of the marriage, which includes a child of two spouses who has not withdrawn from parental charge and cannot support themselves independently.
So when the child is 18 or still in school and still relying financially on parents, they may still legally qualify as a child of the marriage or a dependent child under the Family Law Act. The entitlement to child support under Ontario law is tied to dependency, not age. For the purposes of child support, the age of 18 is a threshold that raises questions. It does not answer them.
If a child support order or separation agreement is already in place, the obligation to pay child support continues until that order is formally changed or terminated. Parents sometimes stop paying when the child is 18 and discover later that arrears have been accumulating through the Family Responsibility Office. The obligation to pay does not end informally. It has to end through a proper legal process.
What “Dependent” Actually Means Past the Age of Majority
Whether the child qualifies as dependent after reaching the age of majority is the question that drives everything else in this area of family law. Courts look at the child’s real situation, not just their age.
The most common reason child support payments continue past age 18 is post-secondary education. When a child is enrolled in post-secondary education at a college or university, a trade school, or any recognized post-secondary school on a full-time basis and is still relying on parental support to cover their costs, they are generally considered dependent. The test for adult child support is not whether the child attends post-secondary education casually, but whether the adult child attending school is still unable to support themselves financially.
Courts have applied a flexible interpretation of what counts as full-time. An adult child attending school with a reduced course load may still qualify if there is a genuine reason, such as a documented health issue. Whether the child is participating in their program of education in a meaningful way and progressing reasonably toward completion is what matters. Children enrolled in post-secondary education on a reduced basis for legitimate health reasons are generally still considered eligible to receive support under Ontario law.
Children of separated or divorced parents often ask whether support may continue in less typical situations, such as during a co-op term, an internship, or a recognized exchange program. Courts look at whether these are genuine parts of the academic program. If the child is enrolled in post-secondary education as part of a recognized degree structure, continued support is more likely.
A child who is unable to obtain the necessaries of life because of illness or disability can remain entitled to support well past any school timeline. Whether child support continues in these cases is decided on the specific facts, and there is no standard end date.
One thing a court will consider is whether the adult child is living at home or living away from home while going to school. That distinction affects how child support is calculated, which brings us to the next section.
How Child Support for an Adult Child in Ontario Gets Calculated
Child support for an adult child in Ontario is not always calculated the same way as it is for a child who is a minor, and the child’s living situation plays a significant role in which approach applies.
The Child Support Guidelines set out two methods for calculating support when a child is over the age of majority. The first, under Section 3(2)(a), applies the standard table amount based on the paying parent’s income. This generally applies when the adult child is living at home, meaning the adult child resides at home with the recipient parent who is still providing day-to-day housing and care while the child attends post-secondary school.
The second method, under Section 3(2)(b), applies when the standard table amount is not appropriate. The Ontario Court of Appeal confirmed in Lewi v. Lewi that when a child is away from home while going to school, whether in a university residence or an off-campus apartment, the table amount becomes less suitable because it was designed with the assumption that the recipient parent is actively housing the child. The court shifts to a needs-based approach, looking at the actual post-secondary education expenses the child incurs and what each parent can reasonably contribute to the child’s post-secondary education.
Under this approach, the child’s school and living expenses are all part of the picture. Tuition, books, residence fees, and food are among the post-secondary education expenses courts consider. Both parents are expected to contribute to the child’s post-secondary costs based on their respective incomes, but the child is also expected to contribute through student loans, OSAP, bursaries, scholarships, and part-time work. Support for post-secondary expenses is not open-ended. The amount of child support paid under this model reflects what is actually needed after accounting for all available resources.
Whether the adult child is at home while going to school or away from home while going to school genuinely changes the math, and it is worth understanding which situation applies before assuming what you owe.
Gap Years, Second Degrees, and the Situations in Between
These are the scenarios that generate the most disagreement, and they do not have clean answers.
A gap year is one of the more contested areas. If a child takes time off between high school and post-secondary school, whether child support should continue during that period is not guaranteed. Support may continue during a purposeful, time-limited gap with a confirmed enrollment plan. Support may not continue for an open-ended pause with no clear direction. A court will consider whether the break is genuinely structured or simply undefined.
Part-time enrollment is evaluated on its own facts. If the child is enrolled in post-secondary education on a reduced basis for a legitimate reason, the child may still qualify to receive support. But a child carrying minimal coursework while primarily employed and self-supporting is harder to categorize as dependent.
For child support for an adult child in Ontario, the baseline expectation is that support continues through completion of a first post-secondary degree or diploma. Beyond that, whether support should continue for a second degree or a graduate program depends on whether the further education is reasonable in the child’s circumstances and career context. Courts have extended adult child support into law school, medical school, and master’s programs when the adult child is still progressing diligently and the program is a reasonable next step. But pay support obligations do not automatically extend beyond a first degree. A paying parent has legitimate grounds to question the obligation to pay once a first program is complete.
When evaluating whether child support for children in these situations should continue, a court will consider:
- Whether the adult child attending further education is making genuine progress
- Whether the child’s post-secondary program connects to realistic career goals
- Whether the child is contributing to their own post-secondary education expenses through loans or work
- The financial circumstances of both parents and the adult child
- What the original child support order or agreement contemplated
When Child Support Actually Ends
There is no single answer to when child support for an adult child in Ontario end applies in any particular case. It depends on the child’s circumstances and whether those circumstances have genuinely shifted.
The most common point where child support payments stop is when the adult child is still in their first post-secondary program but completes it and enters the workforce. Once the adult child is no longer dependent, the entitlement to child support typically ends. Other situations where child support for adult children ends include the adult child marrying or entering a common-law relationship, becoming financially self-supporting, or voluntarily withdrawing from their program without continuing.
A paying parent who wants to terminate child support cannot simply stop making payments. They need to reach a written agreement with the other parent or bring a formal motion to change the child support order. Until that process is complete, the original support orders remain in force and child support is paid under the terms of the existing arrangement. This applies whether the child support obligation arose under a court order or a separation agreement.
If both parents agree that the child support obligation has ended, documenting that agreement formally and filing it with the court protects both parties. An informal handshake is not enough if a dispute arises later. Parents need to stop paying through the proper legal process, not by simply not sending the next payment.
Unsure What You Owe or Whether You Can Stop? Let’s Talk
A lot of parents looking for answers about whether they need to continue to pay are really asking a question that only gets answered by looking at their specific file. Learning about child support rules for adult children is a useful starting point. Applying those rules to your actual situation is where a family law lawyer makes a real difference.
Questions around child support for an adult child in Ontario do not always have obvious answers, and getting it wrong in either direction has real consequences. Continuing to pay when you have legitimate grounds to stop paying costs money you may not owe. Deciding to stop without going through the proper process creates arrears and enforcement action that is much harder to unwind after the fact.
At Kazandji Law, we help Ontario parents work through child support for children at every stage, including the post-18 period where the rules get less predictable. Whether you need to understand what your current child support obligation actually requires, bring a motion to change the existing child support order, or respond to one that has been filed against you, we give you clear legal advice based on your real situation. If you need legal advice on adult child support specifically, our team handles these files regularly and can walk you through your options plainly.
You can find more on our child support page and our family law overview. Reach us at 647-588-3234 in Toronto or 647-697-5975 in Thornhill, or book a free consultation through our contact page. If you are not sure whether child support for an adult child in Ontario still applies to your situation, that is exactly the question to bring to us first.