How Child Support Is Calculated in Ontario: What Every Parent Needs to Know

Child support is one of the most common issues in Ontario family law. Whether you are separating from a spouse or dealing with a change in circumstances, understanding how child support works is essential. The good news is that the Federal Child Support Guidelines provide a clear framework — but there are important nuances that can significantly affect the amount.

The Child Support Guidelines Table Amount

The base amount of child support is determined by the Federal Child Support Guidelines tables. The paying parent's gross annual income and the number of children determine the monthly amount. This table amount is not negotiable — courts treat it as a right of the child, not something parents can agree to waive or reduce. You can look up the table amount on the Department of Justice website using your income and province.

Section 7 Expenses: Beyond the Table Amount

In addition to the table amount, parents may share certain extraordinary expenses under section 7 of the Guidelines. These include childcare, medical and dental insurance premiums, health-related expenses, educational expenses, post-secondary education costs, and extracurricular activities. These expenses are typically shared in proportion to each parent's income.

Shared Custody and Split Custody

If a child spends at least 40 percent of their time with each parent, the shared custody provisions apply. In this situation, both parents' incomes are considered, and the court may set off the table amounts against each other. However, the calculation is not automatic — the court considers the increased costs of maintaining two homes, the actual spending pattern, and the condition, means, and needs of the child. Shared custody does not automatically mean no child support.

When Income Is Hard to Determine

For salaried employees, determining income is usually straightforward. But for self-employed parents, business owners, or those with variable income, calculating the correct income for child support purposes can be complex. The court can impute income — that is, assign an income amount — if it believes a parent is underemploying themselves, hiding income, or not providing proper financial disclosure.

Changing a Child Support Order

Child support orders can be changed if there has been a material change in circumstances. This could include a significant change in income, a change in the parenting schedule, or a child reaching the age of majority. Either parent can bring a motion to vary the existing order. It is important to apply promptly — courts generally will not grant retroactive decreases in child support.

Get Advice from Ken Wise & Associates

Child support disputes can become contentious, especially when income disclosure is incomplete or parenting arrangements are in flux. At Ken Wise & Associates, we help parents navigate child support issues — whether you are seeking support, paying support, or need to change an existing order. Contact us for a consultation.