Sole Custody vs Joint Custody vs Shared Custody in Ontario
Sole Custody vs Joint Custody vs Shared Custody in Ontario
Ontario stopped using the word "custody" in 2021 — but most parents still think in those terms. Understanding what each arrangement actually means under Ontario's current legal framework prevents confusion that can derail your negotiations.
The old terms "sole custody," "joint custody," and "shared custody" map onto two separate concepts that the law now treats independently: decision-making responsibility (who makes major decisions) and parenting time (where the child lives and when).
What "Sole Custody" Means Now
Under current Ontario law, "sole custody" translates to sole decision-making responsibility. One parent has the authority to make all significant decisions about the child's health care, education, religious upbringing, and major extracurricular activities.
Sole decision-making does not mean the other parent loses parenting time. A parent with no decision-making authority can still have the child 40% or even 50% of the time. The two concepts are completely separate.
Courts order sole decision-making when:
- Parents have demonstrated they cannot communicate or cooperate on major decisions
- There's a history of family violence or coercive control
- One parent has consistently undermined the other's relationship with the child
- One parent has serious substance abuse, mental health, or capacity issues
If you're asking for sole decision-making, you need to show the court specific evidence of why joint arrangements won't work — not just that your co-parent is difficult.
What "Joint Custody" Means Now
"Joint custody" maps to joint decision-making responsibility. Both parents must agree on major life decisions. Neither parent can unilaterally choose a new school, consent to elective surgery, or enroll the child in a competitive sports program without the other's agreement.
Joint decision-making requires functional communication. If you and your co-parent can't have a civil conversation about your child's education without it escalating, joint decision-making will generate constant court motions. Courts increasingly scrutinize whether the parents have the working relationship that joint arrangements demand.
A common misconception: joint decision-making does not require 50/50 parenting time. One parent might have the child 70% of the time while both parents share decision-making equally.
What "Shared Custody" Means Now
"Shared custody" is primarily a child support term. Under Section 9 of the Federal Child Support Guidelines, shared custody exists when each parent exercises parenting time with the child for at least 40% of the year — that's 146 overnights or 3,504 hours over 365 days.
Crossing this 40% threshold changes how child support is calculated. Instead of straight table amounts based on one parent's income, the court applies the Contino v. Leonelli-Contino framework: a set-off calculation using both parents' incomes, adjusted for the increased costs of maintaining two full-time households, and balanced against the children's standard of living.
The financial difference can be substantial. A shift from 39% to 40% parenting time can reduce child support obligations by hundreds of dollars per month. This is why parenting time calculations in Ontario must be precise — a few overnights either way can trigger a completely different support formula.
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Choosing the Right Arrangement
The decision isn't really about labels. It's about two practical questions:
Can you and your co-parent make major decisions together? If yes, joint decision-making works. If communication breaks down over every school choice or dental appointment, sole decision-making (or parallel parenting, where each parent handles specific categories) is more realistic.
How much time will each parent spend with the child? This depends on work schedules, proximity of homes, the child's age and developmental needs, and each parent's caregiving history. Courts don't automatically default to any particular split — they evaluate what serves the child's best interests.
The Ontario Child Custody & Parenting Plan Guide includes worksheets for evaluating each arrangement option and calculating your parenting time percentage — so you can make an informed decision before entering mediation or court.
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