In Ontario, if your child spends at least 40% of their time living with you, you have a “shared parenting time” arrangement. Under Section 9 of the Federal Child Support Guidelines, this allows the court to adjust your child support payments by calculating a “set-off” amount based on both parents’ incomes.
When parents separate, one of the biggest concerns is how the family finances will adapt to supporting two households. Under modern Ontario family law, the courts actively encourage both parents to remain deeply involved in their children’s lives. The outdated term “custody” has been replaced with “decision-making responsibility,” and “access” is now called “parenting time.” 📝
Many parents mistakenly believe that if they secure an exact 50/50 parenting schedule, nobody has to pay child support. This is a massive, and often costly, misunderstanding. Even in an equal shared parenting scenario, the parent who earns a higher salary will generally still owe child support to the lower-earning parent to ensure the child enjoys a similar standard of living in both homes.
This guide will explain exactly how the 40% rule works, how to calculate the “set-off” amount, and how increased costs are factored in. We will also discuss when consulting a local family law firm can help you draft a fair Separation Agreement.
Step-by-Step Process in Ontario
Whether you live in Toronto, Hamilton, Brampton, or London, the math behind shared parenting is governed by Section 9 of the Federal Child Support Guidelines. Judges at the Superior Court of Justice use a very specific formula to adjust standard child support. 📍
You must follow these steps carefully, as trying to negotiate child support using “gut feelings” instead of the legal formula will likely result in a judge rejecting your agreement.
Step 1: Track the 40% Threshold
The first requirement is proving that the child actually spends at least 40% of their time with you over the course of a year. This is usually calculated by counting overnights, though some judges will count waking hours if you provide daily care after school. ❗
A schedule of exactly 50/50 clearly meets the threshold. A schedule where the child is with you from Thursday after school until Monday morning every week also generally crosses the 40% mark. If you only have the child for 35% of the time, standard full child support applies.
Step 2: Exchange Full Financial Disclosure
Unlike standard child support where only the paying parent’s income matters, shared parenting requires both parents to disclose their finances. You both must exchange your Canada Revenue Agency (CRA) documents.
Look at Line 15000 of your Notice of Assessment. Both the mother’s and the father’s gross annual incomes are required to perform the shared parenting calculation accurately.
Step 3: Calculate the “Set-Off” Amount
To find the starting point, you pretend that each parent owes the other full child support based on the official provincial tables. 💪
For example, if Parent A earns $80,000, the table says they owe $750 for one child. If Parent B earns $50,000, the table says they owe $450 for one child. You subtract the lower amount from the higher amount ($750 – $450 = $300). In this scenario, Parent A (the higher earner) would pay Parent B a “set-off” amount of $300 per month.
Step 4: Adjust for Increased Costs of Shared Parenting
The set-off amount is just the starting point. Section 9 also requires the judge to look at the increased costs of shared parenting arrangements.
Maintaining two fully equipped bedrooms, buying two sets of winter clothes, and duplicating toys is expensive. If the strict set-off amount leaves the lower-earning parent in extreme poverty, the judge has the discretion to increase the child support payment beyond the simple mathematical set-off to ensure the child is adequately cared for.
How Much Does it Cost in Ontario?
Getting your child support properly formalized protects you from future claims of retroactive arrears. Drafting a solid agreement upfront saves thousands of dollars in future litigation. 💰
Here is a breakdown of the typical costs required to finalize a shared parenting support plan:
| Service / Legal Cost | Estimated Cost (CAD) | Who Pays? |
|---|---|---|
| Basic Child Support (Set-off) | Varies based on Line 15000 | The higher-earning parent |
| Private Family Mediator | $1,500 – $3,500+ Total | Usually split 50/50 |
| Lawyer (Drafting Agreement) | $1,500 – $3,000+ Flat Fee | Each parent pays their lawyer |
| Lawyer (Contested Court Trial) | $15,000 – $40,000+ | Each parent pays their own |
Once you formalize the set-off amount in a Separation Agreement or court order, you can register it for free with the Family Responsibility Office (FRO). The FRO will automatically garnish the set-off amount from the higher earner’s wages to prevent any missed payments.
How Long Does the Process Take?
If you and your ex-partner are amicable and agree on the 40% schedule and your respective incomes, drafting and signing a Separation Agreement with the help of a family law firm takes about 1 to 3 months. ⏱
However, if your ex-partner is fighting tooth and nail to reduce your parenting time to 39% simply to force you to pay full child support, you will end up in a massive court battle.
Resolving a bitter dispute over a parenting schedule at the Ontario family courts currently takes 1.5 to 2.5 years due to severe administrative backlogs. In the meantime, a judge may order temporary child support based on the status quo.
Frequently Asked Questions (FAQ)
Do I pay child support if our incomes are exactly the same?
If you have an exact 50/50 parenting schedule and your gross incomes (Line 15000) are identical down to the dollar, the set-off calculation would mathematically equal zero. In this very rare scenario, no basic monthly child support would exchange hands, though you would still share Section 7 special expenses.
How do Section 7 special expenses work with shared parenting?
Even with shared parenting and a set-off amount, Section 7 “extraordinary expenses” like braces, competitive sports, or daycare are treated separately. These costs are still divided between the parents based on their proportionate incomes, not a strict 50/50 split.
What if my ex-partner hides their income?
If your ex-partner is self-employed and intentionally hiding cash income to artificially lower the set-off amount, a judge can “impute” an income. This means the judge will guess their true earning capacity based on their lifestyle and calculate the child support using that higher, fictional number.
Does paying for groceries count towards my child support?
No. Buying groceries for your house, paying for the child’s clothes, or buying them toys during your parenting time does not reduce your monthly child support obligation. The set-off formula already assumes you are incurring these daily living costs during your 40%+ time.
Should I hire a law firm for a shared parenting agreement?
Yes, highly recommended. The set-off amount is just the starting point. An experienced local family lawyer will ensure the final amount covers the true costs of maintaining two households and will draft an airtight Separation Agreement that a judge will gladly accept.
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