Child Support Calculator

Built from the actual federal tables — not a rough estimate.

The Federal Child Support Guidelines were last amended in 2017 and remain in effect today. They produce a fixed monthly amount based on three inputs: the payor parent's gross annual income, the number of children, and the province or territory the payor lives in. The province matters because the underlying federal formula accounts for provincial income-tax burden — a payor in Quebec keeps more after tax than one in Ontario for the same gross income, so the table amount adjusts.

What the basic table amount includes — and doesn't

• Included: the everyday cost of raising the children: food, clothing, transportation, school supplies, household needs.
• Not included (s.7 expenses): daycare, medical and dental beyond standard, post-secondary tuition, extracurricular activities (when significant), and other "special and extraordinary" expenses. These are typically split proportionally to each parent's income on top of the table amount.

Shared and split custody

If the children spend at least 40% of their time with the payor parent, the Tables are a starting point — but the court considers the increased costs to each parent and may reduce the obligation. The "set-off" method (each parent's table amount, netted) is the most common starting point in shared-custody cases.

High incomes (over $150k)

The Tables explicitly cover income up to $150,000. Above that, the federal guidelines say the court can either apply the table formula or determine the amount considering other factors. This calculator extends the table formula linearly for income up to $1M, which matches what most courts do as a starting point.