Child support in Canada is calculated using federal guidelines based on the paying parent's income. Here is how the formula works, common adjustments, and what you can expect to pay or receive.
Child support is one of the most straightforward calculations in family law - and one of the most misunderstood. In Canada, including BC, child support is determined by federal Child Support Guidelines that use a table-based formula. Here is what you need to know.
The basic principle
Child support is calculated based on:
1. The paying parent's annual income
2. The number of children
3. The province (BC's table is used)
4. Any adjustments for shared parenting time, special needs, or high income
The amount is not negotiable in the same way spousal support is - federal guidelines apply. However, the court can adjust the amount if there are special circumstances.
Step 1: Determine the paying parent's income
Income for child support purposes includes:
• Employment income (salary, wages, bonuses, commissions)
• Self-employment income (averaged over 2-3 years to smooth out fluctuations)
• Investment income (interest, dividends, capital gains)
• Rental income
• Pension income
• Disability payments
• Employment Insurance benefits
• Workers' Compensation benefits
Income does not include:
• Child benefits (Canada Child Benefit, BC earned income credit, etc.)
• Social assistance
• Tax refunds
If a parent deliberately avoids income or has low income by choice (e.g., early retirement), the court may impute (estimate) income based on their earning capacity.
Step 2: Use the federal guideline table
The federal Child Support Guidelines provide a table for BC that shows the monthly support amount based on the paying parent's income and number of children.
Example (BC 2026):
• Paying parent's annual income: $60,000
• Number of children: 1
• Guideline support amount: approximately $600/month
(Note: The actual tables are updated annually; consult a lawyer or the Department of Justice website for the current tables.)
Step 3: Consider adjustments
Shared parenting time adjustment
If the paying parent has the child(ren) at least 40% of the time, the guideline amount is reduced proportionally. For example:
• If both parents have 50/50 custody, the guideline amount may be split or significantly reduced depending on their relative incomes.
• If one parent has custody 60% of the time and the other 40%, the 40% parent's support may be reduced.
High-income adjustment
The federal guideline table typically ends at around $160,000 annual income. If the paying parent earns more than that, the court has discretion to:
• Apply the table to the first $160,000 and calculate support on the excess income (often at a lower rate)
• Consider the condition, means, and needs of the children
• Look at the standard of living the children enjoyed during the marriage
Special expenses and add-ons
In addition to the base guideline amount, the paying parent may be responsible for a portion of:
• Childcare costs (needed for the receiving parent to work or attend school)
• Medical and dental costs
• Prescription drugs and orthodontics
• Health-related counselling
• Post-secondary education
• Extracurricular activities (sports, music, lessons, etc.)
These special expenses are typically split between the parents in proportion to their incomes.
Example calculation with special expenses
• Guideline child support: $600/month
• Monthly childcare cost: $400
• Paying parent's share (60% of income): $240/month
• Total monthly support: $840/month
Step 4: Review for deviations
A court can deviate from the guideline amount if:
• The paying parent has significantly higher or lower income than expected
• The receiving parent has substantial independent income
• There is a substantial disparity in the standard of living between the two homes
• The children have special needs or exceptional talents
• Either parent has other dependents or family members they support
• The parents have agreed to a different arrangement (though the court must still find it is in the children's best interest)
When child support ends
Child support typically continues until the child:
• Reaches age 18 (or age 19 in some cases)
• Completes high school (if still in school at age 18)
• Becomes self-sufficient
• Enters full-time post-secondary education (support may continue, sometimes until age 22-23)
The obligation ends sooner if the child emancipates themselves (moves out and becomes self-sufficient) or if there is a significant change in circumstances that warrants a review.
Common misconceptions
• "I can agree to lower child support" - Child support is for the child's benefit, not the parents'. Even if both parents agree to pay less, a court reviewing the agreement will protect the child's interests. Very low child support amounts may be set aside.
• "If I don't have custody, I don't pay child support" - Child support is based on income, not custody. Even if the other parent has primary custody, you are likely obligated to pay based on your income and the guideline table.
• "Child support is a tax deduction" - In Canada, child support is not tax-deductible to the payer and is not taxable income to the receiver (though this was different in the past).
At Sea to Sky Law™
We help parents understand their child support obligations and rights. If you are separating or need to review an existing child support order, contact us for a free intake call. We will calculate your likely support amount and discuss your options.
This article is for general information only and does not constitute legal advice.