How Child Support Is Calculated in Ontario

Child support is the child’s right and is intended to contribute to the child’s financial needs after parents separate. Ontario mediation can help parents exchange income information, identify the applicable guideline amount and create a practical system for payments and child-related expenses.

The starting point: income and the table amount

The Federal Child Support Guidelines generally use the paying parent’s guideline income, the number of children and the applicable province or territory to determine a monthly table amount. The calculation can become more complex with self-employment, corporations, irregular earnings, benefits, investment income or incomplete disclosure.

How child support is calculated in Ontario

1. Identify the applicable Guidelines. The Federal Child Support Guidelines usually apply when married spouses divorce. Ontario’s Child Support Guidelines apply to many other Ontario family-law claims. The core table approach is closely aligned, but legal advice should confirm the correct law.
2. Determine the number of eligible children. Age alone does not always end support. Dependency, education, illness, disability and the child’s circumstances may matter.
3. Determine guideline income. The usual starting point is annual total income at line 15000 of the tax return, adjusted as the Guidelines require. Current income may need to be determined differently where earnings fluctuate or the tax return does not fairly reflect available income.
4. Find the table amount. Use the paying parent’s applicable province, guideline income and number of children in the current official table. The resulting figure is the basic monthly amount in a straightforward majority-parenting arrangement.
5. Apply any parenting-time rule. Split or shared parenting changes the analysis. Shared parenting begins at not less than 40% parenting time for each parent over the year, but the result is not an automatic zero or mechanical set-off.
6. Add eligible special or extraordinary expenses. Calculate the net expense after subsidies, insurance, tax deductions or credits and the child’s contribution, then determine an appropriate sharing arrangement.
7. Address hardship or other exceptions. High income, step-parent claims, undue hardship, adult children, incomplete disclosure and imputed income can require a different or additional analysis.
8. Record annual disclosure and recalculation. Set dates, documents, an effective adjustment date and a process for bonuses, job changes, arrears and overpayments.

Guideline income is not always line 15000

Line 15000 is a starting point, not an automatic answer in every case. The Guidelines contain required adjustments and allow a court to consider patterns or impute income in defined circumstances. Self-employed parents may need business statements and details of personal expenses paid by a corporation. Shareholders, partners, commissioned employees and people receiving stock compensation, tips or irregular bonuses may require multi-year evidence and professional analysis.

• three years of tax returns and notices of assessment or reassessment
• current pay statements and employment benefit information
• corporate financial statements and shareholder records where applicable
• bonus, commission, overtime, pension, investment and rental-income records
• information about non-recurring income, losses and legitimate business expenses

Special or extraordinary expenses

Additional contributions may be considered for defined expenses such as childcare connected to work or education, uninsured health expenses, some educational needs and certain extracurricular activities. Necessity, reasonableness, available benefits, tax consequences and each parent’s income can matter.

Shared parenting time does not automatically eliminate support

When each parent exercises at least 40% of parenting time over the year, section 9 requires consideration of the table amounts for both parents, the increased costs of shared parenting and the conditions, means, needs and circumstances of each parent and child. A simple table set-off is often an important reference point, but it is not the entire legal test. Count the actual schedule and obtain advice instead of using a “50/50” label.

Child support and income tax

Under the current general tax treatment, child support under a post-April 1997 order or agreement is not deductible by the paying parent and is not taxable income to the recipient. Tax treatment can differ for older arrangements or unusual payment structures. Child-related tax benefits, credits and deductions can also affect the net calculation of special expenses.

Build annual disclosure and adjustment into the agreement

• date for exchanging tax returns and notices of assessment
• additional records for businesses, bonuses or variable income
• method for recalculating support
• effective date for an increase or decrease
• treatment of arrears or overpayments
• notice of job loss, disability, retirement or other material change
• review of special expenses and benefits

Enforcement and documentation

Support terms should be written clearly in a separation agreement or court order. Ontario’s Family Responsibility Office can collect, distribute and enforce eligible support obligations once properly filed. A mediator does not replace the lawyers needed to review and formalize the terms.

Use the official Government of Canada child-support table lookup and review the Federal Child Support Guidelines. Also see financial disclosure for mediation.

General information only; not legal, financial or tax advice. Child-support calculations are fact-specific and the Guidelines change.