# Can Child Support Be Changed If Income or Parenting Changes? Life doesn't stand still after separation. Incomes go up and down. Jobs change. Children grow older and their needs evolve. Parenting arrangements shift as families adjust to new circumstances. If you have a child support order or agreement, you may be wondering whether it can be updated to reflect these changes. The short answer is yes, child support can be changed. In fact, child support is expected to change over time as circumstances change. Unlike some aspects of a divorce that are settled once and remain fixed, child support is designed to adapt to the realities of both parents' lives and the children's ongoing needs. This article explains when and how child support can be modified in Ontario, what qualifies as a significant enough change, and what steps you need to take to update your support arrangement. ## Child Support Is Designed to Reflect Current Circumstances The [Federal Child Support Guidelines](/blog/child-support-ontario-how-calculator-works) set out how child support is calculated based primarily on the paying parent's income and the number of children. Because income is the main driver of child support amounts, it makes sense that support should adjust when income changes significantly. However, child support doesn't automatically update just because circumstances change. The amount usually only changes if parents update it by agreement, through Ontario's recalculation process (if eligible), or by getting a new court order. The system is designed to allow for updates, but someone has to take action to make them happen. Many court orders and separation agreements include provisions requiring annual disclosure of income, typically by exchanging tax returns and notices of assessment. A court can also order updated disclosure where income is relevant to support. This allows support to be adjusted more easily when circumstances change. ## When Can Child Support Be Changed? Child support can be modified when there's been a change in circumstances that would result in a different support amount. The most common triggers include: **The paying parent's income has changed.** If the parent paying support earns significantly more or less than when support was set, the support amount should be recalculated. This includes salary increases, job loss, career changes, retirement, receiving an inheritance that generates income, or starting a business. **The receiving parent's income has changed.** In shared parenting arrangements (where each parent has the children at least 40% of the time), both parents' incomes factor into the child support calculation. A significant change in either parent's income can affect the support amount. **Parenting time has changed.** How much time children spend with each parent affects how child support is calculated. If the parenting arrangement shifts, for example from one parent having most of the parenting time to a shared arrangement, or vice versa, child support should be recalculated. **The children's needs have changed.** Children's expenses evolve as they grow. Childcare costs may decrease when children start school. New expenses may arise for extracurricular activities, tutoring, orthodontics, or other needs. Section 7 "special or extraordinary expenses" under the Guidelines can be added, removed, or adjusted as circumstances change. **A child's dependency status changes.** Support often changes when a child turns 18, but it can continue if the child remains a "child of the marriage" under the [Divorce Act](/glossary#letter-d), including for post-secondary education, depending on the circumstances. When a child is no longer dependent, the support amount should be adjusted to reflect only the remaining dependent children. **New dependants in a subsequent relationship.** Having new children doesn't automatically change table support for existing children. However, new dependants can be relevant in limited situations, such as an undue hardship claim based on a legal duty to support other children. ## How Much Change Is Enough? Not every small fluctuation in income requires a formal support change. Courts and recalculation programs typically look for changes that would materially affect the support amount. While there's no fixed threshold that applies in every case, a change of a few thousand dollars in annual income may not significantly affect monthly support, especially for higher-income earners. On the other hand, a job loss, a major promotion, or a shift from full-time to part-time work would likely be significant enough to warrant recalculation. For parenting time changes, the key thresholds in the Guidelines are: **Majority parenting time:** One parent has the children more than 60% of the time. The other parent pays table support based on their income. **Shared parenting time:** Each parent has the children at least 40% of the time. Shared parenting time cases often start with a set-off of the parties' table amounts, but courts must also consider the increased costs of shared parenting and the circumstances, means, and needs of each parent and the children. **Split parenting:** Each parent has majority time with at least one child. Each parent pays table support for the children in the other parent's care, with the amounts set off against each other. If your arrangement crosses one of these thresholds, it can significantly affect how support is calculated. ## Changing a Court Order vs. Changing an Agreement How you go about changing child support depends on whether you have a court order or a separation agreement. **If you have a court order,** you generally need to go back to court to change it. This is done through a motion to change (using Form 15 in Ontario). You'll need to show that there's been a material change in circumstances since the order was made. However, Ontario offers an alternative for straightforward income-based changes through the Child Support Recalculation Service, which can administratively recalculate support without a court motion (more on this below). **If you have a [separation agreement](/blog/separation-agreement-ontario-what-to-include),** you and your ex may be able to simply agree to change the support terms and sign an amending agreement. If you can't agree, you may need to go to court to ask for a different amount. Courts can override agreement terms for child support if the existing amount doesn't reflect the Guidelines or the children's needs. **If support is being enforced through the Family Responsibility Office (FRO),** you'll need to notify them of any changes so they can update their records. FRO enforces whatever the current order or filed agreement says, so if your support amount changes, make sure FRO has the updated documentation. ## Ontario's Child Support Recalculation Service Ontario offers a Child Support Recalculation Service that can adjust child support amounts without requiring a court motion, saving time and legal costs. This service is available when: The support order or agreement was made on or after a specified date and contains a clause allowing for recalculation. Both parents' incomes are from employment or other straightforward sources (not self-employment or complex income situations). The parents provide their income information as required. Under this program, both parents submit income information annually. The service recalculates child support based on the updated incomes and issues a notice of recalculation, which becomes binding unless a parent objects within a set timeframe. Not all orders qualify for recalculation, and complex situations (like self-employment income, shared parenting calculations, or disputes about income) may still require a court motion. Check whether your order includes a recalculation clause, or ask a lawyer whether this service might work for your situation. ## Going to Court to Change Support If you can't use the recalculation service or reach an agreement with your ex, you may need to bring a motion to change (Form 15) in court. To succeed on a motion to change child support, you generally need to show: **A material change in circumstances** since the order or agreement was made. This is the legal threshold for modifying an existing order. The change should be significant, not just minor fluctuations. **What the new support amount should be.** You'll need to provide current financial disclosure and show how the Guidelines apply to calculate the appropriate new amount. If your case involves shared parenting, complex income, or section 7 expenses, the calculations can be more complicated. Consider getting help from a [family law lawyer](/blog/how-to-choose-a-divorce-lawyer-in-ontario) or at least having a lawyer review your materials. Remember that in Ontario, you typically need to attend a case conference before you can bring most motions. There are exceptions for urgent situations or consent matters, but in most cases you'll need to schedule a conference first. ## Can Changes Be Made Retroactive? Sometimes parents delay seeking a support change even though circumstances have shifted. When they finally do apply, they may ask for the change to be backdated, meaning they want the new amount to apply from the date circumstances actually changed, not just from when they applied to court. Courts can order retroactive changes to child support, but they consider several factors: **Why did the parent delay?** If there's a reasonable explanation for not applying sooner, courts are more likely to grant retroactive relief. **Was there blameworthy conduct?** If the paying parent hid income increases or the receiving parent unreasonably delayed in seeking an adjustment, this affects the analysis. **Will retroactive support cause hardship?** A large lump sum of back support can be difficult to pay. Courts consider the financial circumstances of both parties. **What are the circumstances of the child?** The child's needs and the impact on the child are always relevant. There's no automatic right to retroactive support changes, and courts have discretion in how far back they'll go and how much they'll order. Generally, the longer you wait to address a change, the less likely you are to recover the full difference retroactively. If your circumstances have changed, it's better to address it promptly. ## What If Your Ex Won't Provide Income Information? Both parents have an ongoing obligation to disclose their income for child support purposes. If your ex refuses to provide updated income information, you have options: **Request disclosure formally.** Send a written request for their income documents, specifying what you need (tax returns, notices of assessment, pay stubs, etc.). **Apply to court.** You can bring a motion asking the court to order disclosure. Courts take disclosure obligations seriously in family law matters. **Ask the court to impute income.** If your ex won't disclose or is deliberately underemployed, you can ask the court to "impute" income to them, meaning the court will estimate what they should be earning based on available evidence (past income, education, job market conditions, etc.) and calculate support based on that figure. Don't simply accept "I don't know what they earn" as a reason to leave support unchanged. The legal system provides tools to address non-disclosure. ## Section 7 Expenses and Changes Child support has two components: table support (the base amount from the Federal Child Support Guidelines tables) and section 7 special or extraordinary expenses. Section 7 expenses cover things like childcare, healthcare premiums, medical/dental expenses not covered by insurance, educational expenses, post-secondary education costs, and extracurricular activities. Section 7 expenses are typically shared between parents in proportion to their incomes. When these expenses change, the sharing arrangement should be updated. For example: If childcare costs end when a child starts school, that section 7 contribution should stop. If a child takes up a new sport or activity that qualifies as a section 7 expense, the parents should agree on how to share it. If a child starts post-secondary education, new expenses may arise. Unlike table support, which is tied directly to income and parenting time, section 7 expenses require ongoing communication between parents about the children's needs and costs. Your order or agreement should specify how decisions about section 7 expenses are made and how costs are shared. ## Practical Tips for Managing Support Changes **Keep good records.** Document your income and your ex's income each year. Keep copies of tax returns, notices of assessment, and any other financial documents. **Exchange information annually.** Whether or not your order requires it, exchanging income information each year keeps things transparent and helps catch changes that should trigger a recalculation. **Address changes promptly.** If your income drops significantly, don't wait to address it. The longer you pay more than you should (or receive less than you should), the harder it is to fix retroactively. **Put changes in writing.** If you and your ex agree to change support, document it properly, ideally with a formal amending agreement. Verbal agreements are hard to enforce. **Update FRO.** If support is being enforced through the Family Responsibility Office, make sure they have current information about any changes to your order or agreement. **Get legal advice for complex situations.** If you're self-employed, have fluctuating income, are dealing with shared parenting calculations, or have a high-conflict situation, a [family law lawyer](/blog/how-to-choose-a-divorce-lawyer-in-ontario) can help you navigate the process. [Unbundled legal services](/blog/unbundled-limited-scope-family-lawyers-ontario) can make this more affordable if you don't need full representation. ## Key Takeaways **Child support is designed to reflect current circumstances.** But it only changes through agreement, Ontario's recalculation service, or a new court order. **Income changes are the most common trigger.** If the paying parent's income changes significantly, support should be recalculated. **Parenting time changes also affect support.** Crossing the 40% threshold for shared parenting, in particular, can significantly change how support is calculated. **Ontario's recalculation service can help.** For straightforward income changes, the Child Support Recalculation Service may allow adjustments without going to court. **Court orders require a motion to change.** You'll need to show a material change in circumstances and provide current financial disclosure. **Retroactive changes are possible but not guaranteed.** Courts consider the reasons for delay, the conduct of the parties, and potential hardship. **Non-disclosure can be addressed.** If your ex won't provide income information, courts can order disclosure or impute income. **Section 7 expenses require ongoing communication.** These special expenses change as children's needs evolve and should be addressed regularly. ### Disclaimer This article provides general information about changing child support in Ontario and Canada. It is not legal advice. Child support calculations can be complex, especially in situations involving shared parenting, self-employment income, or special expenses. The rules about material changes and retroactive support involve legal tests that depend on your specific circumstances. For advice about your situation, speak with a family law lawyer.