Key Takeaways
- Equal parenting time does not mean zero child support. Once each parent has the children at least 40 percent of the time, the calculation changes, it does not disappear.
- The set-off between the two table amounts is the starting point, not the answer. Courts then look at the real costs of shared parenting and each household's circumstances.
- Shared parenting usually costs more overall, two bedrooms, two sets of winter gear, and both households need to sustain the children's standard of living.
- Seeking a 50/50 schedule to reduce support is a strategy courts recognize instantly, and it damages the parent running it.
The most persistent myth in Alberta family law might be this one: "if we split the kids 50/50, nobody pays child support." It is wrong in almost every case, and the reasoning behind the rule matters if you are negotiating a shared schedule. Here is how child support actually works once parenting time is shared, and why the naive set-off is only where the analysis begins. For the baseline mechanics, start with how child support is calculated in Alberta.
The 40 Percent Threshold
The shared-parenting rules in the Federal Child Support Guidelines engage when each parent exercises at least 40 percent of parenting time over the year. Below that line, the standard table approach applies and the majority-time parent receives the full table amount. At or above it, the court moves to a different framework built on three considerations: the table amounts each parent would pay the other, the increased costs of the shared arrangement, and the conditions, means, needs, and circumstances of each parent and child.
One honestly awkward point: the Guidelines do not prescribe how to count the 40 percent. Days, overnights, and hours have all been used, and school time gets attributed differently across cases. Around the threshold, counting method can decide the outcome, which is why borderline schedules generate litigation. If your proposed schedule sits near the line, get advice before you anchor to a number.
Why the Set-Off Is Only the Start
The intuitive approach, each parent's table amount calculated on their income, netted against each other, is exactly where the analysis starts. If parent A's table amount is $1,400 and parent B's is $600, the set-off is $800 flowing from A to B. But the framework then requires two further looks:
- The increased costs of shared parenting. Two full households now carry child costs that do not divide neatly: duplicate bedrooms, clothing at both homes, activities, transportation between houses. Shared parenting is usually the most expensive arrangement, not the cheapest.
- Each household's actual circumstances. Where incomes differ substantially, a straight set-off can leave the lower-income home unable to sustain anything like the children's standard of living at the other house. Courts adjust the figure so the children do not live in two different economic worlds.
The practical result: the set-off number often holds where incomes are reasonably close, and is frequently adjusted, most often upward, where they are not. Support hits zero only where incomes are nearly identical.
Section 7 Expenses Do Not Change
Shared parenting changes the base amount analysis, but Section 7 special expenses, childcare, health costs, extraordinary activities, continue to be shared in proportion to income on top of whatever base figure applies. Families in shared arrangements should be especially disciplined about the paper trail, because costs now arise in two households and reconciliation gets messy without a system.
Split Arrangements Are Different
Shared parenting is each child spending substantial time in both homes. Where each parent instead has primary care of at least one child, the Guidelines apply a cleaner rule: calculate what each parent owes the other for the children in the other's care, and set the amounts off. The discretionary overlay that applies to shared time does not complicate the split scenario to the same degree.
The Motive Problem
Because the 40 percent line changes the money, some parents pursue schedules for financial rather than parenting reasons, and some resist equal time for the same reason in reverse. Judges have seen both plays for decades. A parenting proposal that appears engineered around the support consequences undermines the proposing parent on the issue courts actually decide, the best interests of the child. Build the schedule around the children and their logistics; let the support figure follow from the schedule, never the reverse.
Practical Advice for Shared-Parenting Money
- Exchange full income disclosure annually. Both incomes drive the number, so both parents carry disclosure obligations.
- Document the shared-parenting costs. If you will argue the set-off understates your costs, the evidence is receipts, not impressions.
- Write the mechanics into the agreement: the base figure and its rationale, the Section 7 process, the annual adjustment method. Our guide to separation agreements shows where this fits.
- Run the numbers both ways. Our free Alberta child support calculator handles shared arrangements and shows the set-off and each side's table figure.
Frequently Asked Questions
Do you pay child support with 50/50 custody in Alberta?
Usually yes. Once each parent has at least 40 percent of parenting time, the calculation starts from the set-off between the two table amounts and is then adjusted for the real costs of shared parenting and each household's circumstances. Support is zero only where incomes are nearly identical.
How is the 40 percent threshold counted?
The Guidelines do not prescribe a method. Days, overnights, and hours have all been used, and near the line the counting method can change the result, which makes borderline schedules a genuine legal question.
Is the set-off amount automatic in shared parenting?
No. The set-off is the starting point. Courts then consider the increased costs of the arrangement and each parent's and child's circumstances, and adjust where a straight set-off would leave the households too far apart.
What about Section 7 expenses in shared parenting?
They continue on top of the base figure, shared in proportion to incomes: childcare, health costs, extraordinary school and activity expenses.
Will seeking more time reduce my child support?
Crossing 40 percent changes the formula, but a schedule pursued for financial reasons is a pattern courts recognize and weigh against the parent advancing it. Parenting proposals need parenting justifications.
Get Shared-Parenting Support Right
Shared arrangements combine the hardest counting question in the Guidelines with a discretionary money analysis, and both turn on evidence. We build the numbers properly, on incomes, costs, and disclosure. Learn about our child support services or book a confidential consultation or call (403) 804-0497.
This article is general information about Alberta family law and is not legal advice. Reading it does not create a solicitor-client relationship. Every situation is different, and you should speak with a lawyer about your specific circumstances.
William Aadil Musani is a Calgary family lawyer and the founder of Cunningham Family Law. Before family law, he practiced corporate law, tax law, and M&A with international firms and a Tier-1 Canadian tax boutique, experience he now applies to financially complex divorce and separation matters. More about William →