Ottawa Child Support Lawyer

Talk to an Experienced Ottawa Child Support Lawyer

Child support affects your children’s daily lives and your household finances every month. Whether you are establishing support for the first time, dealing with a payor who has not disclosed their full income, or returning to court after a change in circumstances, you need an Ottawa child support lawyer who understands the guidelines, the enforcement mechanisms, and the strategy that gets you to a fair result.

At RPB Family Law, our child support lawyers in Ottawa guide you from the first disclosure request through to a child support order you can rely on. We calculate accurate amounts under the Federal Child Support Guidelines, address imputed income where necessary, handle shared custody calculations, and manage enforcement through the Family Responsibility Office where required.

If you have questions about child support in Ontario, get in touch with our Ottawa child support lawyer at 613-216-5044 or fill out a form online, and we will reach out to you.

WhatRPB Law Provides Clear Child Support Advice in Ontario

Child support is a payment made by one parent to the other to financially support their children after separation or divorce. In Ontario, both parents have an obligation to support their children regardless of whether they were married, in a common law relationship, or never in a formal relationship at all.

Child support in Ontario consists of two components:

1. The table amount: The base monthly payment calculated under the Federal Child Support Guidelines, based on the payor’s guideline income, the number of children, and the province of residence. This amount is set by formula and is commonly not discretionary.
2. Section 7 expenses: Special or extraordinary expenses are shared proportionally between parents, often in proportion to their incomes. These include childcare costs, medical and dental expenses not covered by insurance, extracurricular activities, and post-secondary education costs.

Child support is not tax deductible for the payor and not taxable income for the recipient, for orders and agreements made after May 1, 1997. This distinguishes it from spousal support, where different tax rules apply.

For a plain-language overview of how the obligation works and what both parents are entitled to, our guide on what child support is in Ontario covers the key rights and responsibilities.

The Federal Child Support Guidelines

Calculation, Income, and Disputes

The Federal Child Support Guidelines set the framework for calculating child support in Ontario. For most cases, the monthly table amount is determined by three variables: 

1. the payor parent’s annual income
2. the number of children
3. the province where the payor lives

The Ontario Child Support Guidelines apply where the Divorce Act does not.

While the formula is straightforward in simple cases, disputes arise regularly around what the payor’s true guideline income is, particularly where income is complex, variable, or deliberately understated.

When Income is Imputed: Self-Employed, Corporate, and Complex Cases

Courts can impute income to a parent where the declared income does not reflect actual earning capacity. This happens more often than many people expect, and it is one of the most contested issues in child support proceedings.

Common situations where imputed income arises include: 

• self-employed income, where business expenses have reduced the reported net income below real earnings
• corporate income retained inside a company rather than drawn as personal salary
• commission-based or highly variable income that is difficult to annualize
• and parents who are voluntarily underemployed, unemployed, or who have restructured their affairs to minimize apparent income. 

Where the payor’s income is over $150,000, the Guidelines may allow a different analysis if the table amount is inappropriate, but the table amount is still often an important starting point. A claim of undue hardship can also be made in either direction where the table amount would cause serious financial difficulty, though these claims are assessed carefully against the household standards of living on each side.

Proper financial disclosure is the foundation of every child support calculation. Depending on the issues, both parents must exchange sworn financial statements, three years of tax returns and notices of assessment, pay stubs, and, where relevant, corporate financial statements and business records. If the other parent is not disclosing fully, our Ottawa child support lawyer team knows how to compel production and challenge incomplete disclosure before the court.

Work with RPB Law to Address Difficult Child Support Calculations

Child Support and Shared Custody

The 40% Rule in Ontario

When parents share parenting time more equally, the standard child support formula changes.

Under the Federal Child Support Guidelines, if each parent has the child for at least 40% of parenting time over the year, section 9 of the Guidelines applies. Courts often begin with a set-off comparison of each parent’s table amount, but set-off is not automatically the final number. The court must also consider the increased costs of shared parenting time and the conditions, means, needs, and other circumstances of each parent and child.

For questions about how parenting time and decision-making responsibility are structured and documented, our dedicated team can advise.

How the Set-Off Calculation Works

Under the set-off approach, each parent’s table amount is calculated based on their own income and the number of children. The parent with the higher income pays the difference to the lower-income parent. 

In a primary residence arrangement, the custodial parent receives the full table amount from the non-custodial parent. In a shared custody arrangement meeting the 40 percent threshold, the set-off replaces it. The court also considers the actual standard of living in each home and may adjust the result where a strict application would not serve the best interests of the child.

When the 40% Threshold is Disputed

Whether a parent genuinely meets the 40 percent rule is often contested. Courts count actual time with the child, not the schedule on paper. If a parent claims shared custody to reduce their support obligation but does not consistently exercise that time, we document the real parenting pattern and protect the appropriate support level for the children. 

Our child custody lawyers in Ottawa work alongside child support files where parenting time and support are interconnected.

For a full explanation of how shared custody is defined and measured, our guide on what shared custody is in Ontario covers the key concepts in detail. 

Changing or Ending Child Support in Ottawa

Child support can often be reviewed or changed where there has been a material change in circumstances. Courts retain authority to ensure child support complies with the law, but the process depends on whether support is set by court order, filed agreement, or private agreement.

Grounds for Varying Child Support

The legal trigger for a variation of child support is a material change in circumstances since the existing order or agreement was made. Common grounds include: 

• a significant change in income for either parent
• job loss or new employment
• a change in the child’s needs
• a change in parenting arrangements that affects the 40 percent threshold
• or a child reaching adulthood 

If there is an existing court order or filed agreement, a motion to change may be required. 

Where both parents agree on the change, a consent order, amended separation agreement, or child support agreement is the straightforward route. Where they disagree, the motion to change process applies. Our Ottawa child support team advises on both paths. 

Divorce mediation in Ottawa and arbitration are often efficient routes to a variation agreement when both parents can engage constructively.

When Does Child Support End in Ontario?

Child support does not automatically end when a child turns 18. Under both the Divorce Act and the Family Law Act, support continues for a child who remains a child of the marriage, typically a child still enrolled full-time in post-secondary education or unable to withdraw from parental care due to illness or disability. In practice, support often continues through a first undergraduate degree or college diploma.

When a child finishes school, becomes financially self-sufficient, or begins living independently, a motion to change or a new agreement is often still required. Simply stopping payments without a court order or consent agreement creates arrears that can be enforced by the Family Responsibility Office. 

For a step-by-step guide to the termination process, our guide on how to stop child support when a child turns 18 explains what is required.

Retroactive Child Support Claims

A parent who delays making a child support claim does not necessarily lose the right to collect for the past.

Courts can order retroactive child support dating back to when the payor first knew or should have known that support was owed, and in some circumstances back to the date a claim was first formally made. Retroactive claims are assessed on the specific facts and involve considerations of delay, the payor’s conduct, the child’s circumstances, and the hardship of repayment.

Child support arrears under an existing order can be enforced by the Family Responsibility Office, which has broad enforcement powers, including: 

• wage garnishment
• driver’s licence suspension
• passport suspension
• and interception of tax refunds and government benefits

A support deduction order can also direct an employer to deduct support automatically from the payor’s wages. 

For a full overview of FRO’s enforcement tools, the blog on enforcing child support in Ottawa covers the process in detail.

Contact RPB Law for Guidance on Child Support Disputes in Ottawa

Child Support in Ottawa | FAQs

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Do I have to pay child support if we were never married?

Yes. Child support obligations apply regardless of whether the parents were married, in a common law relationship, or were never in any formal relationship. Under Ontario’s Family Law Act, both parents are responsible for supporting their children. 

If the parents were married and the claim is under the Divorce Act, the Federal Child Support Guidelines usually apply. If the claim is under Ontario’s Family Law Act, the Ontario Child Support Guidelines generally apply. The calculation framework is similar.

Is child support tax deductible in Canada?

No, not for agreements and orders made after May 1, 1997. Child support payments are not tax deductible for the payor and not taxable income for the recipient. This is different from spousal support, where periodic payments are generally deductible for the payor and taxable for the recipient.

Can I stop paying child support if I’m denied parenting time?

No. Parenting time and child support are separate legal obligations. Even if the other parent is wrongfully withholding your parenting time, you cannot unilaterally stop paying support. Only a court order can change the amount you owe. Withholding support creates arrears that the Family Responsibility Office can enforce regardless of the parenting dispute. 

If you are being denied parenting time, pursue that issue through the appropriate family court process while continuing to pay support.

How does shared custody affect child support payments?

When each parent has the child for at least 40% of parenting time, courts often begin with a set-off comparison of each parent’s table amount. But set-off is not automatically the final number. The court also considers the increased costs of shared parenting time and the conditions, means, needs, and other circumstances of each parent and child.

The court also considers the standard of living in each home and may adjust the result where a strict application does not serve the best interests of the child.

The information on this page is provided for general informational purposes only and does not constitute legal advice. Child support entitlement, guideline income, table amounts, section 7 expenses, shared parenting-time calculations, imputed income, adult-child support, retroactive support, variation, termination, and enforcement through the Family Responsibility Office depend on the specific facts of each case, the applicable legislation, the support order or agreement, and the parties’ financial disclosure. Reading this page or contacting RPB Family Law through this website does not create a lawyer-client relationship. For advice about your specific child support rights, obligations, arrears, variation, or enforcement issue, please speak with a qualified Ontario family lawyer.