Child support is one of the most important and straightforward obligations in Ontario family law—yet it’s also one of the most misunderstood. Many parents in Sarnia wonder who pays child support, how it’s calculated, and what happens if financial circumstances change.
At its core, child support ensures that children continue to benefit from both parents’ financial resources after separation. Our experienced Sarnia family lawyers help parents understand their rights and responsibilities, resolve disputes, and create child-focused agreements that comply with Ontario law.
What Is Child Support?
Child support is a parent’s legal obligation to contribute to the costs of raising their child after separation or divorce. It is not optional—under both the Divorce Act and the Family Law Act, every parent must support their children financially according to their ability.
Child support is intended to cover basic living expenses like food, clothing, and shelter. In some cases, parents also share special or extraordinary expenses, such as childcare, medical costs, or post-secondary education.
Who Has to Pay Child Support?
The parent who does not have the majority of parenting time—meaning the child lives primarily with the other parent—is generally the one who pays child support. This rule applies whether parents were married or in a common-law relationship.
When parents share parenting time more equally (each having the child at least 40% of the time), support may still be paid, but the calculation changes to reflect both parents’ incomes and time with the child.
This paramount legal standard ensures that a child’s right to financial support cannot be waived or reduced, even by mutual agreement. Courts will not approve any arrangement that compromises the child’s entitlement under the law.
In Sarnia, as elsewhere in Ontario, the court’s focus is always on the child’s best interests, not the parents’ personal preferences.
How Is Child Support Calculated?
Child support in Ontario has two main components: the Table Amount, which is a base monthly payment set by the Federal Guidelines, and Section 7 Expenses, which are additional, special costs (like childcare or medical expenses) shared between parents based on their incomes.
In Ontario, support amounts are determined primarily by the Federal Child Support Guidelines. These guidelines use the paying parent’s gross annual income and the number of children to determine a standard monthly payment.
The calculations assume that the parent with primary care already contributes directly to the child’s daily needs, so the other parent’s payments help balance overall expenses.
Example
If a parent in Sarnia earns $70,000 per year and has one child living primarily with the other parent, the guideline table for Ontario specifies the monthly amount owed. If the same parent has two children, the amount increases accordingly.
Online calculators, such as those provided by the Department of Justice, can give a general idea, but legal advice ensures accuracy—especially when income is variable or complex.
A Quick Local Example
For instance, if one parent in Sarnia works in the region’s manufacturing sector earning around $75,000 annually and the other parent earns $45,000, child support would be based primarily on the higher earner’s income and the child’s living arrangement. In shared parenting cases, both incomes are considered to create a balanced calculation.
Special consideration is often needed when income is not straightforward, such as self-employment, corporate income (for business owners or shareholders), seasonal work, or underemployment. In these cases, a court may “impute income”—that is, assign a reasonable income level—to ensure fairness and prevent avoidance of support obligations.
Understanding your rights under the Federal Child Support Guidelines can be complex. To discuss how these rules apply to your specific situation, contact our Sarnia family lawyers.
What Are “Special or Extraordinary” Expenses?
In addition to the base Table Amount, parents may share certain additional costs known as Section 7 Expenses. These include:
- Childcare expenses (for work or school)
- Medical or dental expenses not covered by insurance
- Educational expenses (like tutoring or private school)
- Post-secondary education
- Costs for extracurricular activities (such as competitive sports or music lessons)
These expenses are divided between parents in proportion to their incomes. For example, if one parent earns 60% of the total combined income and the other earns 40%, the higher-earning parent pays 60% of these additional costs.
How Long Does Child Support Last?
Child support usually continues as long as the child is dependent, which often includes:
- Until the child turns 18
- While the child is enrolled full-time in post-secondary education
- When a child has a disability or illness preventing independence
The court’s guiding principle is the child’s ongoing dependency, not simply their age. For example, a university student living at home in Sarnia may still qualify for support while pursuing their degree.
How Is Child Support Enforced?
Once an agreement or order for child support is made, payments can be enforced through Ontario’s Family Responsibility Office (FRO).
The FRO ensures payments are made on time and in full. If a payer falls behind, the FRO has strong legal powers to collect funds.
Common enforcement actions include:
- Wage garnishment
- Seizing tax refunds
- Placing liens on property
- Suspending a driver’s licence or passport
For Sarnia families, registering a support order with the FRO provides financial stability and avoids the emotional strain of personal enforcement.
Can Child Support Be Changed?
Yes. Child support can be changed—or varied—if there is a material change in circumstances. Common examples include:
- A significant increase or decrease in either parent’s income
- A change in the child’s living arrangements or dependency status
- The start or end of post-secondary education
Even without a major life change, many court orders and agreements require parents to exchange full financial information—such as tax returns and income statements—every year. This ensures that the child support amount remains accurate and fair according to the current income levels under the Guidelines.
To request a change, parents can apply under the Family Law Rules or, if the original order came from a divorce, under the Divorce Act. It’s often more efficient to handle these updates through negotiation or mediation before returning to court.
What Happens If Child Support Isn’t Paid?
If child support isn’t paid, the Family Responsibility Office can take swift enforcement measures. In addition to wage garnishment or licence suspension, the FRO can seize bank accounts, intercept Employment Insurance or tax refunds, and report arrears to credit bureaus.
The longer arrears go unpaid, the more serious enforcement becomes. Communicating early and updating your order or agreement when finances change can prevent future problems.
What If Parents Share Custody or Income Is Uneven?
In shared parenting arrangements—where each parent has the child at least 40% of the time—support is usually offset. Each parent’s guideline amount is calculated based on their own income, and the higher earner pays the difference to the other parent.
This ensures both households contribute fairly to the child’s overall expenses. It’s especially common in Sarnia families with flexible work schedules or parents who live close enough to share parenting time.
When incomes fluctuate (for example, seasonal work or commission-based jobs), the court may use averaged income over several years to determine a fair amount.
Can Parents Make Their Own Agreement?
Yes, parents can create a separation agreement that sets out child support, parenting arrangements, and other responsibilities. However, the support amount must meet or exceed what the Federal Child Support Guidelines require—courts can reject agreements that fall below the legal minimum.
For the agreement to be enforceable, both parents should provide full financial disclosure and obtain independent legal advice (ILA). This ensures fairness and protects both parties from future disputes.
Our Sarnia family lawyers can draft or review separation agreements to ensure they comply with Ontario law and serve the child’s best interests.
How Child Support Relates to Other Family Law Issues
Child support is often linked to other issues such as spousal support and decision-making responsibility (formerly custody). The law prioritizes children’s needs first—child support must be paid before spousal support.
Property division can also affect the calculation of support if one parent receives or retains significant assets. The goal is always to create a fair, sustainable arrangement that meets the child’s needs and respects both parents’ financial capacity.
Tax Implications of Child Support
Under Canadian tax law, child support payments are not tax-deductible for the payer and are not taxable income for the recipient. This distinguishes child support from spousal support, which is generally deductible and taxable.
Parents should keep accurate records of payments, especially if there are combined orders for both spousal and child support, to avoid confusion at tax time.
Support for Post-Secondary Education
When children pursue college or university, parents may still be required to contribute to their expenses. Courts often expect both parents to share reasonable tuition and living costs, depending on their financial capacity.
Support can continue while the child attends a recognized program full-time, even if they live away from home. The amount may change if the child receives scholarships, bursaries, or works part-time.
Local Family Law and Support Resources in Sarnia
Families in Sarnia have access to several legal and community resources for child support and family law assistance:
- Family Responsibility Office (FRO) – enforcement of child and spousal support payments.
- Ontario Courts Family Division – information about court procedures and family law forms.
- Legal Aid Ontario – Sarnia Family Law Service Centre – advice, representation, and mediation referrals for eligible residents.
- County of Lambton Family Law Resources and Mediation Centre – free and low-cost mediation services.
- B.L.C. Community Legal Clinic and Legal Assistance of Windsor – legal and advocacy support for lower-income and cross-border families.
Taking the Next Step
Child support ensures that children receive the stability and care they deserve, regardless of their parents’ relationship status. Whether you are establishing, varying, or enforcing a child support order, it’s important to understand your legal rights and obligations.
If you need guidance on child support or help resolving related family law issues, contact our experienced Sarnia family lawyers. We’ll help you reach a fair, practical solution that protects your children and your financial future.
