Child Support After Age 18 in Ontario: School, Dependency and Disclosure

Published October 15, 2026 · Meysami Law Professional Corp. · Ottawa

Turning 18 does not automatically end every child-support obligation in Ontario. The applicable law, the wording of an order or agreement and the adult child's circumstances all matter. Post-secondary education may support continued dependency, but enrollment alone does not answer every question about entitlement, amount or duration. Current evidence is essential before support is changed.

Start with the applicable legal framework

Ontario's age of majority is 18, but the federal Divorce Act can still treat an older child as a child of the marriage when the child remains unable, because of illness, disability or another cause, to withdraw from the parents' charge or obtain the necessities of life. Provincial legislation may apply in other cases. The correct statute, existing order and family circumstances should be identified before conclusions are drawn.

Post-secondary education can be relevant, not automatic

Justice Canada explains that reasonable post-secondary education may be an 'other cause' that keeps an adult child within the support framework. The analysis can include the program, course load, progress, educational plan, living arrangements, the child's ability to work, available resources and the parents' financial circumstances. A gap year, part-time studies, repeated programs or a change of program may require closer evidence rather than a blanket rule.

The amount may not be calculated in only one way

Section 3(2) of the Federal Child Support Guidelines addresses a child who is at or over the age of majority. The table amount can apply where it remains appropriate. If the court considers that approach inappropriate, it may determine an amount based on the child's condition, means, needs and other circumstances and the financial ability of each parent to contribute. The result is fact-specific and is not simply tuition divided between parents.

Separate basic support from education expenses

Tuition, compulsory fees, books, residence, transportation, meal plans, health costs and other items may raise both basic-support and special-or-extraordinary-expense questions. Grants, scholarships, bursaries, loans, RESP withdrawals, the child's earnings and tax benefits may also matter. Identify who actually pays each expense and avoid counting the same cost twice.

Exchange current, organized disclosure

Useful records may include proof of enrollment, program and expected completion dates, course load, transcripts or progress information where relevant, tuition and fee statements, residence or rent costs, grants and scholarships, student-loan information, RESP records, the child's income and work schedule, and each parent's current income disclosure. Privacy should be respected, but a support position must be supported by enough reliable evidence to assess entitlement and amount.

Read the existing order or agreement before changing payment

Some orders or agreements contain review dates, termination events, notice clauses or document-exchange requirements. A change in circumstances does not necessarily change the payable amount automatically. Stopping or reducing payment unilaterally can create arrears or enforcement issues; continuing an outdated arrangement without review can also prolong disagreement. Obtain advice about consent, variation and any enforcement-agency steps.

Build a review record before the school year

Set a reasonable annual date to exchange enrollment, expenses, income and funding records. Prepare a simple budget separating tuition, living costs and amounts already covered. Record residence during school and breaks, the anticipated completion date, employment plans and any health or disability issue affecting independence. An Ottawa family lawyer can then compare the evidence with the legislation, order or agreement and propose a documented update rather than relying on assumptions about age.

This article is general information as of October 15, 2026, not legal, tax or financial advice. Rules and circumstances can change. Contacting the firm does not create a lawyer-client relationship.