Key Takeaways
- Child support in Alberta has two layers: a base table amount driven by the paying parent's income and number of children, plus a share of Section 7 special expenses such as childcare and health costs.
- The table amount comes from the Federal Child Support Guidelines and depends on the paying parent's guideline income, the number of children, and the province where the payor lives.
- Child support is the child's right. Parents cannot bargain it away below the guideline figures without proper justification, and courts protect the guideline amounts.
- Support is not carved in stone: incomes change, and amounts should be updated with annual income disclosure or through Alberta's recalculation program.
Child support generates more day-to-day questions than almost anything else in family law, and most of them have surprisingly structured answers. Unlike spousal support, where ranges and judgment calls dominate, child support in Alberta is largely formula-driven. This guide walks through how the calculation actually works: the table amount, what counts as income, the extra expenses added on top, and the situations where the formula bends. If you just want a number, our free Alberta child support calculator applies the current tables in about two minutes, and this article explains what is happening underneath.
Which Law Applies
For married parents who divorce, child support is ordered under the federal Divorce Act and calculated under the Federal Child Support Guidelines. For parents who were never married, Alberta's Family Law Act applies, with provincial guidelines that mirror the federal scheme. In practice the calculation runs the same way in both streams, so the distinction rarely changes the number.
Layer One: The Table Amount
The starting point is a lookup. The Guidelines publish tables that convert three inputs into a monthly figure: the paying parent's guideline income, the number of children support is paid for, and the province where the paying parent lives. An Alberta payor uses the Alberta table wherever the children live. The tables are updated periodically, most recently in 2025, so an amount set years ago may no longer match the current table for the same income.
The table amount covers the ordinary costs of raising children: housing, food, clothing, and everyday activities. It is payable regardless of the recipient's income in the standard arrangement, because it approximates what the payor would spend on the children at that income level.
What Counts as Income
Guideline income usually starts with line 15000 of the payor's tax return, with adjustments set out in the Guidelines. For employees, that is close to the whole story. It gets more involved where a parent:
- Controls a corporation. Salary and dividends actually paid may understate what is available; corporate pre-tax income can be attributed to the parent where appropriate. Our article on child support for high income earners covers how this plays out.
- Is self-employed. Deductions that are legitimate for tax purposes, such as a portion of home office or vehicle costs, may be added back for support purposes.
- Has variable income. Bonuses, commissions, and fluctuating self-employment income are often averaged over recent years.
- Is underemployed by choice. Courts can impute income where a parent earns less than they reasonably could, based on age, health, education, and work history.
Layer Two: Section 7 Special Expenses
On top of the table amount, parents share certain expenses under Section 7 of the Guidelines: childcare needed for work or school, medical and dental insurance premiums for the child, health expenses beyond insurance coverage, some extraordinary school costs, post-secondary education, and extraordinary extracurricular activities. These are usually shared in proportion to the parents' incomes, and the sharing is based on the net cost after tax credits, subsidies, or benefits tied to the expense. We break down what qualifies and how the math works in our guide to Section 7 expenses.
Where the Formula Bends
- Income above $150,000. The tables prescribe a formula above $150,000, but courts have discretion to depart from a strict application where the resulting amount would exceed what is reasonable. High-income cases are argued, not just looked up.
- Shared parenting. Where each parent has the children at least 40 percent of the time, the calculation changes and both incomes matter. Our article on child support in shared parenting explains why a simple set-off is only the starting point.
- Split arrangements. Where each parent has primary care of at least one child, the two table amounts are set off against each other.
- Adult children. Support can continue past 18 for children who cannot withdraw from parental care, most commonly because they are in post-secondary studies, and the approach can shift from the strict table amount.
- Undue hardship. A narrow escape valve exists for genuinely exceptional circumstances, but the bar is high and it compares living standards across both households.
Keeping the Number Current
Support is based on income, and income moves. Most orders and agreements build in annual exchange of tax returns, and amounts should be adjusted when guideline income changes materially. Alberta also operates a recalculation program that can administratively update table amounts based on updated income disclosure, which keeps small changes from turning into court applications. Letting an outdated number ride for years is how large retroactive claims are born, a topic we cover in our article on retroactive child support.
Frequently Asked Questions
How much is child support in Alberta?
It depends on the paying parent's guideline income, the number of children, and the current Alberta table, plus a share of Section 7 expenses. Our free Alberta child support calculator applies the current tables to your numbers.
Is child support taxable in Canada?
No. Child support is not taxable to the recipient and not deductible to the payor. That treatment differs from periodic spousal support, which is generally deductible and taxable.
Can we agree to less than the guideline amount?
Child support is the child's right, and courts protect the guideline figures. Agreements that undercut them without proper justification are not enforceable, and a court can reopen the issue.
Until what age is child support paid in Alberta?
At least until 18, and often beyond where the child remains dependent, most commonly during full-time post-secondary studies. The amount and form of support for adult children can differ from the table figure.
What happens if the payor's income changes?
The amount should change too. Update through agreement, Alberta's recalculation program, or a court application. Waiting invites arrears or retroactive claims, and income changes should be disclosed rather than discovered.
Get the Number Right
Most child support disputes are really income disputes: what the payor truly earns, what a corporation could pay, what should be added back. That is financial analysis as much as family law. William Aadil Musani practiced corporate law, tax law, and mergers and acquisitions before founding Cunningham Family Law, and applies that background to support cases involving business owners and complex compensation. Learn more 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 →