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How Spousal Support Is Calculated in Alberta
Alberta courts and lawyers work from the Spousal Support Advisory Guidelines (SSAG). The SSAG are advisory rather than law, but they anchor negotiation and most court outcomes. They produce a range, not a single number, and they answer two questions: how much, and for how long.
There are two main formulas. The without child support formula applies when there is no concurrent child support obligation: the range is 1.5 to 2 percent of the gross income difference for each year of cohabitation, to a maximum of 50 percent, with duration of half a year to one year per year together. The with child support formula is a different machine entirely: it works from each spouse's net disposable income after child support, taxes, and government benefits, and targets leaving the recipient with 40 to 46 percent of the combined pool. That second formula is why serious calculators need a tax engine, and why simple percentage tools get cases with children wrong.
A Worked Example
Take a couple who lived together for fourteen years with no dependent children. One earns $145,000, the other $38,000. The gross difference is $107,000.
The without child support formula takes 1.5 to 2 percent of that difference for each year together. Fourteen years gives 21 to 28 percent, so the range is roughly $1,873 to $2,497 a month, with duration of seven to fourteen years. If the same couple had two young children, the calculation changes completely: child support is worked out first and takes priority, then the spousal range is derived from what each household has left after tax and child benefits, and the numbers come out substantially lower.
That is the single most important thing to understand about spousal support. The formula that applies depends on whether child support is payable, and the two formulas are not variations on a theme. They are different machines that happen to answer the same question.
Why Two Calculators Disagree
People often run their numbers through several online calculators and get different answers. Usually one of these is the reason:
- Entitlement is assumed. Every calculator, including this one, produces a range as though entitlement has already been established. It is a threshold legal question, and without it the answer is zero no matter what any formula says.
- Guideline income is not the number on the tax return. For business owners, retained earnings, dividends, and personal expenses run through a corporation can all move it. Two calculators fed different income figures will never agree.
- Tax and benefits are modelled differently, or not at all. The with child support formula runs on net disposable income, so it depends on provincial tax rates and child benefit amounts that change every year. A calculator using last year's parameters will drift.
- Cohabitation, not marriage. The Guidelines measure the relationship from the date you began living together, not the wedding. Using the marriage date shortens the relationship and understates both amount and duration.
Entitlement Comes First
The single biggest limit of any spousal support calculator, including this one: the SSAG only apply once entitlement is established. Entitlement is a legal question about economic disadvantage, need, and the roles adopted during the relationship. An income gap alone does not guarantee support, and without entitlement the answer can be zero regardless of what any formula says. Treat the range as what support would look like if entitlement is made out.
Duration, Indefinite Support, and the Rule of 65
Under the without child support formula, support runs roughly half a year to a year for each year of cohabitation. It becomes indefinite (duration not specified) after twenty years together, or where the relationship lasted at least five years and the years plus the recipient's age at separation total 65 or more. Indefinite does not mean permanent: amounts remain reviewable and variable as circumstances change, including retirement. With children, initial orders are typically indefinite in form, with an expected cumulative range the calculator shows.
Where Calculators Mislead
Online calculators, ours included, cannot determine entitlement, cannot decide guideline income for business owners, and do not apply the SSAG exceptions or restructuring, which trade amount against duration. They also depend on benefit and tax parameters that change every year. We keep this one current, publish the assumptions, and flag the situations where the formulas give way to discretion: incomes above the $350,000 ceiling, below the $30,000 range, and child support incomes above $150,000. Use the result as a well-informed starting point, then have it reviewed. Our spousal support page covers entitlement, variation, and support for business owners in depth.
Spousal Support Calculator FAQs
Is there an official spousal support calculator for Alberta?
No. The federal government publishes the Spousal Support Advisory Guidelines but no calculator. Lawyers use commercial software; public tools, including this one, implement the same published formulas with published tax parameters. The child support side does have an official look-up, and our table amounts come from the same federal tables it uses.
Why is the range so wide?
The SSAG deliberately produce ranges. Where a case lands depends on the strength of the compensatory claim, the recipient's need, the payor's ability to pay, and self-sufficiency incentives. Location within the range is argued, not calculated.
Does the calculator handle common-law relationships?
Yes. The SSAG use years of cohabitation rather than years of marriage, and Alberta's Family Law Act provides partner support for adult interdependent partners. Enter the total years you lived together.
Can spousal support be paid as a lump sum?
Yes, through restructuring: the monthly range and duration define a global value that can be front-loaded, extended, or converted to a lump sum. Lump sums are not tax deductible and must be discounted for tax, which the monthly figures here do not reflect.
How is spousal support calculated in Alberta?
Alberta uses the federal Spousal Support Advisory Guidelines. Where no child support is payable, the range is 1.5 to 2 percent of the gross income difference for each year of cohabitation, capped at 50 percent, with duration of half a year to a year per year together. Where child support is payable, child support is calculated first and the spousal range is derived from each spouse's net disposable income after tax and benefits, targeting 40 to 46 percent of the combined pool for the recipient.
How long does spousal support last in Alberta?
Roughly half a year to one year of support for each year you lived together. It becomes indefinite, meaning no fixed end date rather than permanent, after twenty years together, or where the relationship lasted at least five years and the years plus the recipient's age at separation total 65 or more. Where there are children, duration also runs against a second test tied to the age of the youngest child.
Can spousal support be changed or ended later?
Yes. Support can be varied on a material change in circumstances: a significant income change, job loss, retirement, illness, or a change in parenting arrangements. Indefinite support is not permanent support; it means the end date was left open, subject to review and variation.
Does a new relationship end spousal support?
Not automatically. A recipient's new relationship may reduce need and can be a factor, but it does not terminate support by itself, particularly where the claim is compensatory rather than needs-based. The outcome depends on the basis for entitlement in the first place.
Is this legal advice?
No. The calculator provides general information and estimates, assumes entitlement, and does not create a lawyer-client relationship. For advice on your situation, book a consultation.
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