# Child Support in Canada: How It's Calculated and When It Changes When parents separate, one of the first questions is usually about money. How much child support will be paid? Who pays it? Can we agree on a different amount? In Canada, child support is not negotiable in the same way other financial issues are. There are federal guidelines designed to make sure children receive consistent, predictable support based on the paying parent's income and the parenting arrangement. This guide explains how child support is calculated in Canada, when it can change, and what happens if parents want to agree on a different amount. ## The Child Support Guidelines: The Starting Point For divorces under the federal Divorce Act, child support is calculated using the Federal Child Support Guidelines, which include table amounts for each province and territory. Most provinces and territories also use these or very similar guidelines for non-divorce cases. These guidelines include tables that show the basic monthly child support amount based on the paying parent's gross annual income, the province or territory where they live, and the number of children. The purpose of the guidelines is to make child support more predictable and fair. Parents don't need to argue about what's reasonable. The table amounts are presumed to be the right amount unless there are special circumstances. You can find the federal Child Support Guidelines tables on the Department of Justice Canada website. Each province and territory has its own table because the cost of living varies across the country. ## How Basic Child Support Is Calculated The most common child support situation involves one parent who has the children most of the time (the recipient parent) and one parent who pays support (the paying parent). In this scenario, the paying parent's child support obligation is calculated using the guideline table for their province based on their gross annual income and the number of children. For example, if a parent in Ontario earns $60,000 per year and has two children, the table shows a specific monthly amount. If their income goes up or down, the amount changes accordingly. The basic table amount is meant to cover everyday costs like food, clothing, housing, and basic activities. It does not usually include special expenses like daycare, medical costs, or extracurricular activities. Those are handled separately under [Section 7 expenses](/glossary#letter-s). ## Special and Extraordinary Expenses (Section 7) On top of the basic monthly child support, parents may also share the cost of special or extraordinary expenses. These are called Section 7 expenses after the section of the Child Support Guidelines that lists them. Common Section 7 expenses include childcare costs needed for work or school, medical and dental expenses not covered by insurance, orthodontics and counseling, post-secondary education expenses, and extracurricular activities if they are reasonable given the parents' financial situations. Section 7 expenses are usually shared between the parents in proportion to their incomes. For example, if one parent earns 70% of the combined family income and the other earns 30%, they split the cost 70/30. Parents need to agree on which expenses qualify, or a judge will decide. Not every expense automatically counts. The test is whether the expense is necessary or reasonable given the child's best interests and the parents' means. ## Shared Parenting Time and Split Custody The basic table calculation assumes the children live primarily with one parent. But what if parents share time more equally, or what if there are multiple children who live in different arrangements? **Shared parenting time** applies when a child spends at least 40% of the time with each parent over the course of a year. In these cases, the judge or the parents calculate child support using a different method that takes both parents' incomes and the increased costs of two homes into account. **Split custody** applies when there is more than one child and each parent has the majority of parenting time with at least one of the children. In this situation, each parent calculates what they would owe for the children living primarily with the other parent, and then the higher amount is offset against the lower amount. Both shared parenting and split custody calculations can be complex. If this applies to you, it's worth [talking to a family law lawyer](/blog/how-to-choose-a-divorce-lawyer-in-ontario) or using a detailed calculator to make sure you get it right. ## Income: What Counts and What Doesn't Child support is based on **gross annual income**, which usually means your income before taxes and deductions. For employees, this is typically the income shown on line 15000 of your tax return (total income). For self-employed parents or business owners, the calculation can be more complicated because expenses, depreciation, and other tax strategies may not reflect actual income available for support. Courts can also [impute income](/glossary#letter-i), meaning they can assign a higher income than what a parent reports if the judge believes the parent is underemployed by choice, hiding income, or not reporting all their earnings accurately. Common reasons for imputing income include working part-time when capable of full-time work, being paid under the table, or using corporate structures to minimize personal income in a way that doesn't reflect actual lifestyle. ## Can You Agree to Less or More Than the Guidelines? Parents sometimes wonder if they can agree to a different amount of child support than what the guidelines say. The short answer is: it depends, and the rules are strict. You **cannot** simply agree to less child support than the guidelines require without a very good reason. Child support is considered the right of the child, not the parents, so parents cannot bargain it away. However, courts may accept an agreement for a different amount if the child's needs are otherwise being met. For example, if the paying parent provides housing, pays for private school directly, or covers significant expenses in another way, a judge might approve a lower table amount as long as the overall arrangement is fair and in the child's best interests. You **can** agree to more than the guideline amount, and courts will generally approve this as long as both parents understand and consent. If you're considering agreeing to non-standard child support, get legal advice. An agreement that looks reasonable today might not hold up later if circumstances change or if one parent challenges it. ## When Child Support Changes Child support is not set in stone. It changes when circumstances change, particularly when the paying parent's income changes significantly, the parenting arrangement changes, or the child's needs change such as starting daycare or finishing school. Either parent can apply to vary (change) a child support order or agreement if there has been a material change in circumstances. This requires going back to court or renegotiating the agreement. In Ontario and some other provinces, there are administrative recalculation or online child support services that can update child support based on recent income information, often without a full court hearing, as long as the case qualifies and parents provide the required documents. If your income drops significantly because of job loss, illness, or other genuine reasons, you should seek legal advice about varying the support order as soon as possible. Support obligations do not automatically decrease. You must take legal steps to change them. ## Enforcement: What Happens If Support Isn't Paid If a parent doesn't pay court-ordered child support, there are serious consequences. In Ontario, the Family Responsibility Office (FRO) is responsible for collecting and enforcing support payments. FRO can garnish wages, intercept federal payments and tax refunds, suspend driver's licences and passports, report to credit bureaus, and, in serious cases, ask the court for stronger enforcement measures that can include jail time. Other provinces and territories have similar enforcement agencies. Child support is taken very seriously, and there are few acceptable excuses for not paying. If you're the recipient parent and support isn't being paid, contact your provincial enforcement office. If you're the paying parent and genuinely cannot pay, do not simply stop paying. Get legal advice immediately about how to vary your order. ## Child Support and Taxes Child support payments are **not taxable** to the recipient and **not tax-deductible** for the payer. This has been the law in Canada since 1997. This is different from spousal support, which is taxable and deductible. Make sure you understand which payments are which, especially if you have both child and spousal support in an agreement. ## Tools and Resources If you're trying to calculate child support, there are helpful tools available. The federal government provides a simplified online child support calculator through the Department of Justice Canada website. This gives you a rough idea of table amounts, though it may not handle complex situations like shared parenting or Section 7 expenses. For Ontario residents, we also have a detailed guide that walks through the calculation process step by step. This can help you understand what to expect before you negotiate or go to court. If money is tight and you're worried about affording legal help, our guide on [how to separate when you have no money](/blog/how-to-separate-when-you-have-no-money-in-ontario) includes information about free and low-cost legal resources. ## Key Takeaways Child support in Canada is calculated using the federal Child Support Guidelines based on the paying parent's income, the number of children, and the province or territory. The basic table amount covers everyday expenses. Special expenses like daycare, medical costs, and activities are usually shared separately under Section 7. You generally cannot agree to less than guideline child support without a good reason and court approval. You can agree to more. Child support changes when there is a material change in circumstances like income changes or parenting arrangement changes. If support isn't paid, enforcement agencies have strong powers including wage garnishment and license suspension. Child support is not taxable or tax-deductible. Getting the calculation right matters. If you're unsure, [talk to a family law lawyer](/blog/how-to-choose-a-divorce-lawyer-in-ontario) or use a reliable calculator to double-check the numbers. ### Disclaimer This article provides general information about child support in Canada. It is not legal advice. Child support rules are federal, but some aspects vary by province and territory. For advice about your specific situation, speak to a family law lawyer in your province.