When Does Child Support End in Ontario? Termination, Age, and Exceptions

Parents who pay child support often wonder when their obligation will finally come to an end — and parents who receive it wonder the same thing, for very different reasons. The short answer is that child support in Ontario usually stops when a child reaches the age of majority. But "usually" is doing a lot of work in that sentence.

Ontario law recognizes that turning 18 does not automatically make a young person financially self-sufficient. A child attending university, living with a serious illness, or facing a disability may remain entitled to support well into adulthood. At the same time, support can end earlier than the age of majority under certain circumstances.

Knowing where the default rule ends and the exceptions begin can save you from paying too long, collecting too little, or being blindsided when an order suddenly changes.

The Default Rule: Age of Majority

Under Ontario's Family Law Act, a parent's obligation to pay child support generally ends when the child reaches the age of majority — which in Ontario is 18 years old. This is also the default position under the federal Divorce Act for married parents who separate.

Once a child turns 18, the paying parent is no longer automatically required to continue payments. If support is governed by a court order or a separation agreement, the obligation typically ends on the date specified in that document. Many orders are written to terminate "when the child ceases to be a child of the marriage" or "on the child's 18th birthday, unless the child is enrolled in full-time education."

If your order has specific language, read it carefully — the wording controls what happens next.

When Support Continues Past the Age of Majority

The age of majority is a starting point, not a hard cutoff. Both the Family Law Act and the Divorce Act allow support to continue beyond 18 when a child remains dependent on their parents and cannot become self-sufficient.

Full-time post-secondary education

This is the most common reason support extends past 18. A child enrolled full-time in college, university, or a trade program is generally still considered a dependant. Courts look at whether the child is genuinely pursuing their education, whether the program is reasonable given their abilities and the family's circumstances, and whether the child is contributing to their own costs through part-time work, student loans, or bursaries.

Support during post-secondary years is not automatic, and the amount may be recalculated to account for the child's own income and contributions. Summer breaks and co-op terms can also raise questions about whether support should pause or continue — another reason the specific language of your order matters.

Illness or disability

A child who cannot become financially independent because of a serious illness or disability may be entitled to support indefinitely. There is no age cap in these situations. Courts consider the nature of the condition, the prognosis, and whether the child is able to earn income or participate meaningfully in the workforce.

If this applies to your family, it is worth building clear language into your separation agreement or order from the start rather than litigating it later.

Events That Trigger Termination of Support

Several life events can end a child support obligation before — or independently of — the age of majority.

Marriage or common-law relationship

If the child gets married or enters a common-law relationship, they are generally no longer considered a dependant under Ontario law. Their new partner's obligation to contribute to their household effectively replaces the parental support structure. A paying parent would typically apply to court to formally terminate the order once this happens.

Becoming financially independent

A child who secures steady, full-time employment and is genuinely self-supporting is no longer a dependant. This is assessed case by case. A child who earns some income while in school is different from one who has a full-time career and lives independently. If a child drops out of school, lands a job, and rents their own apartment, that combination usually signals the end of the support obligation.

Withdrawing from parental control

This one surprises many parents. If a child voluntarily removes themselves from both parents' care and supervision — not because of conflict or abuse, but by choice — they may lose their entitlement to support. Courts call this "withdrawing from parental control." It typically requires the child to be living independently and to have cut ties with both households on their own initiative.

This is a nuanced area. A child leaving one parent's home because of a difficult relationship does not automatically lose support. The circumstances matter, and courts are careful not to penalize children for family conflict.

How to Formally End or Vary a Support Order

Child support does not always stop automatically when a triggering event occurs. If you have a court order, you generally need a formal court order to change or terminate it. Stopping payments unilaterally — even when you believe you are legally entitled to — can expose you to enforcement action and arrears.

The right step is to bring a motion to vary or terminate the order before the Family Court, showing the material change in circumstances (the child turned 18, completed school, married, or became self-sufficient). If both parents agree, a consent order is usually faster and less expensive than a contested motion.

Separation agreements can sometimes be amended by written agreement, but check whether your agreement requires court approval for changes. When in doubt, get that change documented properly.

What Happens to Unpaid Arrears?

Here is something many parents do not realize: when child support ends, unpaid arrears do not disappear.

Arrears are amounts that came due under a previous order and were never paid. They survive the termination of the ongoing obligation and remain enforceable as a debt. The Family Responsibility Office (FRO), which enforces support orders in Ontario, can continue to collect arrears through wage garnishment, driver's licence suspension, passport denial, and other enforcement tools — even after the child is an adult.

If you have arrears and the underlying support obligation has ended, you may be able to apply to court to reduce or reschedule them in limited circumstances, but courts are reluctant to forgive arrears entirely. The better approach is always to address arrears while the order is still active.

Frequently asked questions