In Alberta, 50/50 shared parenting does not eliminate child support. Under section 9 of the Federal Child Support Guidelines, when each parent has the child at least 40% of the time, courts use the set-off method: each parent's Federal Table amount is calculated, and the higher earner pays the difference. A $397 monthly set-off is typical between mid-range incomes.
Key Facts: Child Support and Divorce in Alberta
| Factor | Detail |
|---|---|
| Filing Fee | $260 Statement of Claim + $10 Central Divorce Registry = $270 total (up to $300 with property division). As of June 2026. Verify with your local clerk. |
| Waiting Period | 12-month separation under Divorce Act § 8; divorce order not granted until the full year elapses |
| Residency Requirement | One spouse ordinarily resident in Alberta for 12 consecutive months before filing (Divorce Act § 3(1)) |
| Grounds | One-year separation, adultery, or cruelty (Divorce Act § 8) |
| Property Division Type | Equal division of family property under Alberta's Family Property Act |
| Child Support Authority | Federal Child Support Guidelines § 9 (divorcing parents); 2025 Federal Tables effective October 1, 2025 |
Does 50/50 Custody Eliminate Child Support in Alberta?
No. Child support with 50/50 custody in Alberta is still payable in nearly all cases where the parents earn different incomes. The most common misconception in Alberta family law is that equal parenting time automatically cancels child support. Instead, Federal Child Support Guidelines § 9 directs courts to calculate each parent's Table amount and apply a set-off, so the higher-income parent pays the difference. Support reaches zero only when both parents earn identical incomes.
The legal foundation rests on a single principle: child support belongs to the child, not the parent. Even when both parents share parenting time equally, the child is entitled to enjoy a comparable standard of living in each household. Because Alberta uses the language of "parenting arrangements" and "parenting time" rather than the older term "child custody," a 50/50 split refers to roughly equal parenting time. The question of who pays support turns on income, not on the parenting schedule alone. A parent earning $120,000 will almost always pay something to a parent earning $75,000 under any equal-time arrangement.
The 40% Threshold for Shared Parenting
Shared parenting for child support purposes begins at 40%, not at a strict 50/50 split. Under Federal Child Support Guidelines § 9, if each parent exercises at least 40% of parenting time over the course of a year, the shared-parenting calculation applies. A 60/40 arrangement therefore qualifies, even though it is not perfectly equal. This 40% threshold determines whether the set-off method or the standard single-payor Table amount governs the case.
Courts in Alberta measure the 40% threshold by hours of responsibility, not overnight stays alone. In Kolada v. Kolada (1999), the Court of King's Bench held that the appropriate calculation totals the hours a child spends in the care or responsibility of each parent, calling that approach "simpler, clearer and more fair." Time before and after school, during holidays, and at extracurricular activities all count toward the percentage. The Supreme Court of Canada confirmed in C.M.B. v. B.D.G. (2014) that no universal formula exists, so each case is decided on its own facts. The burden of proving the 40% threshold falls on the parent seeking the adjustment, as the Alberta Court of Appeal held in EG v. DG, 2022 ABCA 129.
How the Set-Off Method Calculates Shared Custody Child Support
The set-off method is the dominant approach to shared custody child support in Alberta. Each parent's Federal Table obligation is calculated as if the other parent had primary parenting time, then the lower amount is subtracted from the higher amount. The higher-income parent pays the difference. For example, if one parent owes $1,113 monthly and the other owes $716, the set-off payment is $397 per month.
This straight set-off derives from section 9(a) of the Federal Child Support Guidelines. Consider a concrete illustration using current Federal Tables: a parent earning $75,000 has a one-child Table obligation of roughly $716 per month, while a parent earning $120,000 owes roughly $1,113 per month. The set-off result is $1,113 minus $716, leaving the higher earner to pay $397 monthly. The set-off is attractive because it is an objective, mathematical calculation, whereas the other section 9 factors require judicial discretion. The 2025 Federal Child Support Tables, effective October 1, 2025, govern all amounts calculated from that date forward; the 2017 Tables apply to periods between November 22, 2017, and September 30, 2025.
| Annual Income | Approximate Monthly Table Amount (1 child, Alberta) |
|---|---|
| $50,000 | ~$472 |
| $75,000 | ~$716 |
| $100,000 | ~$939 |
| $120,000 | ~$1,113 |
| $150,000 | $1,318 (per justice.gc.ca example) |
Figures are approximate and based on the 2025 Federal Child Support Tables for one child. Verify exact amounts with the official 2025 child support table look-up.
Set-Off Is Not Automatic: Section 9 Discretion
Reaching the 40% threshold does not guarantee a simple set-off in Alberta. Federal Child Support Guidelines § 9 requires courts to consider three factors: the Table amounts for each parent under section 9(a), the increased costs of shared parenting under section 9(b), and the conditions, means, needs, and circumstances of each parent and child under section 9(c). Judges are not limited to subtracting one Table amount from another.
The Alberta Court of Appeal sharpened this point in MacDonald v. Brodoff, confirming that courts should demand more information about the section 9(b) and 9(c) factors when the evidence is deficient. This means a parent cannot simply reach 40% time and expect support to drop by the set-off amount automatically. The increased costs of maintaining two fully equipped households for the child, the relative incomes of the parents, and the child's standard of living in each home all factor into the final figure. In EG v. DG, 2022 ABCA 129, the Court of Appeal held that proving the 40% threshold carries "both quantitative and qualitative consideration," placing the evidentiary burden squarely on the parent seeking the reduction. Contested shared-parenting cases therefore often require a court application rather than a quick administrative recalculation.
Do I Still Pay Child Support With Joint Custody in Alberta?
Yes, you still pay child support with joint custody in Alberta whenever your income exceeds your co-parent's income. Joint decision-making responsibility and equal parenting time do not erase the income gap that drives support. The higher earner pays the set-off difference between the two Federal Table amounts under Federal Child Support Guidelines § 9. Only identical incomes produce a zero payment.
Alberta uses precise terminology that matters here. "Decision-making responsibility" replaces the older phrase "legal custody," and "parenting time" replaces "physical custody" or "visitation." Sharing decision-making responsibility equally — a true joint arrangement — has no direct effect on the support calculation, which depends on parenting time percentages and income. A parent who assumes that 50/50 parenting time support obligations vanish under joint custody often discovers that a meaningful set-off payment remains. The practical lesson is that pursuing equal parenting primarily to reduce support frequently backfires, because the set-off can still produce a substantial monthly obligation when incomes differ significantly.
Section 7 Special and Extraordinary Expenses
Section 7 expenses are paid in addition to base child support and are shared in proportion to each parent's income. Under Federal Child Support Guidelines § 7, special or extraordinary expenses are divided according to the parents' relative incomes, not their parenting time. A parent earning 60% of the combined household income pays 60% of eligible section 7 costs, regardless of an equal parenting schedule.
Eligible section 7 expenses fall into defined categories. They include child-care costs incurred because of employment, illness, disability, or education; the portion of medical and dental insurance premiums covering the child; health-related expenses exceeding insurance reimbursement by at least $100 annually (such as orthodontics, counselling, physiotherapy, prescriptions, glasses, and hearing aids); extraordinary primary or secondary education costs; post-secondary education; and extraordinary extracurricular activities. To qualify, the expense must be necessary in the child's best interests and reasonable given the parents' means and the family's pre-separation spending patterns. Courts deduct any subsidies, tax credits, or benefits before allocating the parents' shares, so the net cost — not the gross — is divided proportionally between the two households in a shared parenting arrangement.
Federal vs. Alberta Child Support Guidelines
The Federal Child Support Guidelines apply to divorcing parents, while the Alberta Child Support Guidelines apply to unmarried or separated-but-married parents. Both use identical formulas and the same Federal Tables, so the calculated amount is the same regardless of which set governs. The distinction matters only for the legal authority cited in the order, not for the dollar figure a parent pays.
The Federal Child Support Guidelines (SOR/97-175) operate under the Divorce Act for parents who have divorced or filed for divorce. The Alberta Child Support Guidelines (Alta Reg 147/2005) apply to parents who never married, married parents who separate without filing for divorce, and non-parents caring for a child. Because both frameworks rely on the same Federal Tables and the same section 9 shared-parenting analysis, a 50/50 parenting arrangement produces the same set-off result under either guideline. Equal custody child support in Alberta is therefore calculated consistently whether the parents are married, separated, or never married, with the income figures from each parent's most recent tax return driving the outcome.
The Child Support Recalculation Program
Alberta's Child Support Recalculation Program adjusts support amounts annually based on updated income, charging a $77 service fee per parent when the amount changes. The program reviews each file about three months before the order's anniversary date and recalculates support using current income tax information. By law, recalculated amounts must be paid as if stated in the original order, and decisions take effect on the 31st day after receipt unless a parent objects.
The program has important limits in shared parenting situations. It can recalculate proportionate shares of section 7 expenses or monthly support in shared parenting cases only when both parents provide income information. However, because shared parenting under Federal Child Support Guidelines § 9 involves discretionary considerations — the increased costs of two households and the qualitative analysis from EG v. DG — genuinely contested 50/50 determinations typically fall outside the administrative framework. The program also cannot fully recalculate income for self-employed parents or those with private corporations, since those reviews require investigation and judicial discretion. To object to a recalculation, a parent must commence a court application to vary, suspend, or terminate the order.
How to File and What It Costs in Alberta
Filing for divorce in Alberta costs $270 in government fees: a $260 Statement of Claim fee plus a $10 Central Divorce Registry fee. Filings that combine divorce with property division under the Family Property Act may cost up to $300. You file the Statement of Claim for Divorce at the Court of King's Bench, and at least one spouse must have been ordinarily resident in Alberta for 12 consecutive months before filing under Divorce Act § 3(1).
Fee waivers are available for those who cannot afford the filing fee. Recipients of Income Support, AISH, or Alberta Works generally qualify automatically; others must demonstrate financial hardship through an Application for Fee Waiver and Statement of Finances. A significant procedural change took effect for 2026: the Family Focused Protocol, launched January 2, 2026, requires parties to complete four steps before accessing Court of King's Bench resources — the Parenting After Separation course (when children are involved), an alternative dispute resolution attempt within six months, full financial disclosure, and a Family Court Counsellor meeting for self-represented litigants. These fees are current as of June 2026. Verify all amounts with the Alberta Court of King's Bench registry or alberta.ca/court-fees before filing.