- Age 18 is not a legal cutoff in Ontario family law.
- Calculating support for an adult child is more nuanced than for younger children.
- Beyond the base monthly support amount, post-secondary costs are typically treated as Section 7 special and extraordinary expenses under the Federal Child Support Guidelines.
Many Ontario parents assume child support ends the moment their child turns 18 or finishes high school. In practice, that is rarely how it works. When a child leaves home to attend university or college, support obligations often continue — sometimes for years — and the rules shift in important ways.
If your child is heading to post-secondary education and you are either paying or receiving support, understanding how Ontario law handles child support for adult children pursuing university can save you from a costly misunderstanding. This guide walks through when support continues, how the amount is calculated differently for adult children, and what happens to tuition and living costs.
When Does Child Support Continue Past Age 18 in Ontario?
Age 18 is not a legal cutoff in Ontario family law. Both the Divorce Act (for married parents) and Ontario's Family Law Act (for unmarried parents) extend support obligations to children who remain "dependent" on their parents — including those in full-time post-secondary studies.
"Child of the marriage" — what it means
Under federal divorce legislation, a child remains a "child of the marriage" if they are under the age of majority or, once past that age, if they cannot withdraw themselves from their parents' charge because of illness, disability, or pursuit of reasonable post-secondary education. Ontario's provincial statute uses similar language about a "child" who is enrolled in a full-time program of education.
In plain terms: if your 19- or 21-year-old is a full-time student and genuinely cannot support themselves while studying, they likely still qualify for support. Courts look at the whole picture — the demands of the program, the child's ability to work part-time without academic harm, and whether the educational path is reasonable given the family's circumstances and the child's abilities.
How Support Is Calculated for an Adult Child in School
Calculating support for an adult child is more nuanced than for younger children. Courts do not simply apply the Federal Child Support Guidelines table amount and call it done.
The table amount as a starting point
For a younger child living primarily with one parent, the table amount based on the paying parent's income is essentially automatic. For an adult child attending university, the table amount is a starting point only — not the final answer. Courts have discretion to order more or less depending on the circumstances.
The key reason for this flexibility: an adult child attending school usually does not live full-time with either parent in the same way a younger child does. They may live in residence, in an off-campus apartment, or split time between the family home and school. That changes the economic reality, and the law acknowledges it.
The adult child's contribution
Courts in Ontario expect adult children to contribute to their own support where they reasonably can. A student earning income from summer jobs, part-time work during the school year, or student loans (non-repayable grants aside) will generally be expected to put some of those resources toward their own expenses.
There is no fixed rule about how much a student must contribute — it is a proportionality exercise. A student working 20 hours a week in a demanding engineering program will be treated differently from one working the same hours in a lighter course load. The court weighs what is realistic without undermining the student's academic success.
Tuition and Living Expenses as Section 7 Items
Beyond the base monthly support amount, post-secondary costs are typically treated as Section 7 special and extraordinary expenses under the Federal Child Support Guidelines. These are costs shared between parents in proportion to their respective incomes, on top of any table-amount support.
Common Section 7 post-secondary expenses include:
- Tuition and mandatory student fees
- Textbooks and required course materials
- Residence or off-campus housing costs (net of any rent paid by the student)
- A meal plan, where residence requires one
- Field trips or professional program costs
The adult child's own resources — grants, bursaries, part-time income — are typically deducted before splitting the remainder between parents. Repayable student loans are usually treated differently from non-repayable grants: a loan the child must one day repay is not treated as income available today.
When Support Can Be Reduced or Ended
Support does not continue indefinitely simply because a child is enrolled somewhere. Courts can reduce or end support when the circumstances no longer justify it.
Gap years and part-time studies
A gap year, a decision to switch programs, or a drop to part-time status can all affect eligibility. If a child is not actively enrolled in full-time studies and is capable of working, they may no longer qualify as a "child of the marriage" in the legal sense. Each situation is fact-specific — a medical leave looks very different from choosing not to return after a failed year.
Part-time enrollment is a common grey zone. Courts generally require a compelling reason — health, caregiving responsibilities, or documented academic necessity — before maintaining full support for a part-time student who could otherwise work.
The child becomes financially independent
Support ends when the adult child is genuinely able to withdraw from their parents' charge. Finishing a degree and landing a job is the most common trigger. So is cohabiting with a partner, taking a full-time position mid-degree, or otherwise becoming self-sufficient in a meaningful way.
If circumstances change, either parent (or in some cases, the adult child themselves) can bring a motion to vary or terminate the order.
Frequently asked questions
Does child support automatically stop when my child graduates high school?
No. In Ontario, support does not end automatically at any fixed point. If your order or separation agreement is silent on post-secondary education, you may need to return to court or negotiate a new arrangement when your child enrols in university. It is worth addressing this in any agreement while children are still young.
Can my ex-partner and I agree to a different amount for university costs?
Yes. Parents can negotiate a custom arrangement — splitting tuition, setting a cap, or specifying how the student's income is factored in. A properly drafted separation agreement is binding and avoids court proceedings. Make sure any agreement is specific about what expenses are covered and how changes in enrollment or income trigger a review.
My child is 20, living in residence, and refuses to share their financial information with me. What happens?
This is a genuinely contested area. Courts generally expect an adult child claiming support to provide their own financial disclosure — tax returns, notice of assessment, evidence of enrollment, and scholarship or bursary details. If the child refuses, the paying parent can raise that non-disclosure as a reason to reduce or terminate support. A child who wants support has a responsibility to be transparent about their finances.
Does support continue if my child takes a second degree or a professional program?
Possibly. Courts have extended support through graduate and professional programs where the child's chosen career path reasonably requires it and where the family's financial means support it. However, a second undergraduate degree for a child who already completed one is scrutinized more closely. The longer the program continues, the heavier the burden on the child (and receiving parent) to show continued eligibility.
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