Spousal support in Ontario — who pays, how much, how long
Last updated: May 31, 2026
TL;DR. Spousal support in Ontario is not automatic. You first have to be entitled to it — on compensatory, needs-based, or contractual grounds. If entitlement exists, the Spousal Support Advisory Guidelines set a low-to-high monthly range from the two incomes and the length of the relationship, plus a duration range. With children, the formula changes and child support is calculated first. Periodic spousal support is tax-deductible to the payor and taxable to the recipient. By the end of this page you will know your likely range and the one thing to do before you discuss a number with anyone.
Most men hear a figure from a spouse, a friend, or a forum and assume that is the number. Spousal support is one of the few parts of separation where the framework is public and you can run your own range before anyone files anything. Knowing it early changes what you agree to and what you refuse.
Do you even owe spousal support?
Entitlement is the gate, and it comes before any number. There are three grounds. Compensatory — one spouse gave up career or earning capacity for the family, so the other owes for that economic disadvantage. Non-compensatory, or needs-based — one spouse cannot meet reasonable needs at the standard of living the relationship set. Contractual — a marriage contract or separation agreement promises support (see separation agreements in Ontario).
Married spouses claim under section 15.2 of the federal Divorce Act. Married and common-law partners can also claim under sections 30 and 33 of the Ontario Family Law Act. Common-law has a threshold: continuous cohabitation of at least three years, or a child together in a relationship of some permanence. No entitlement means no support — a higher earner does not automatically pay a lower earner. A short marriage between two working adults with no economic disadvantage often produces no entitlement at all.
How much? The Spousal Support Advisory Guidelines
The Spousal Support Advisory Guidelines — the federal framework that produces support ranges from income and relationship length — are not law, but every Ontario court and lawyer uses them. There are two formulas.
Without child support, the amount is roughly 1.5 to 2 percent of the gross income difference for each year of cohabitation, capped at 50 percent of that difference. That produces a low, mid, and high monthly range (the math is worked through in spousal support without children). With child support, a separate with-child formula runs after child support is set and on an after-tax basis. It is more involved and generally lower, because child support is prioritised over spousal support (see how child support is calculated).
A worked example, no children: you earn $140,000, your spouse earns $40,000, the marriage lasted 12 years. The difference is $100,000. At 1.5 to 2 percent per year over 12 years, that is roughly 18 to 24 percent of the difference — a range of about $1,500 to $2,000 per month. The range is real and the spread is wide, so the mid-point is a decision, not a default. Run yours in the calculator before you anchor on anyone else's figure.
How long does spousal support last in Ontario?
Duration also runs off the Guidelines. Without children, support generally lasts between half a year and one full year for every year of cohabitation. A 10-year marriage points to roughly 5 to 10 years of support.
Two rules extend that. The Rule of 65 — if the years of cohabitation plus the recipient's age at separation total 65 or more, and the marriage lasted at least 5 years, support can be indefinite. Marriages of 20 years or longer are also generally indefinite under the Guidelines. "Indefinite" does not mean forever — it means no fixed end date, open to review on a material change such as retirement. The triggers and the review mechanics are covered in when spousal support ends.
How is spousal support taxed?
This is the biggest difference from child support, and the one most men miss. Periodic spousal support paid under a written agreement or court order is tax-deductible to the payor and taxable to the recipient, under sections 56.1 and 60.1 of the Income Tax Act. Lump-sum spousal support is not deductible. Child support, for any agreement made after May 1997, is tax-neutral — neither deducted nor taxed.
The practical effect is large. A $3,000 per month spousal obligation for a payor at a 40 percent marginal rate costs closer to $1,800 per month after the deduction. The headline figure is not the real cost. You do not have to wait for a refund to feel that difference either — Form T1213 lets you take the deduction off every paycheque (see Form T1213 explained).
When do courts depart from the range?
The Guidelines are a guideline, not a cap. Courts go outside the range for a strong compensatory claim, a payor carrying heavy debt-servicing obligations, a recipient with significant assets or unrealised earning capacity, a short marriage with a large income gap, or a fixed self-sufficiency timeline.
The most common fight is over the inputs, not the formula. If a spouse is intentionally under-employed, a court can impute income — assign a higher income than they actually earn — and run the entire range off that figure. The range is only as defensible as the income numbers feeding it. Cairn is built only for Ontario family law; see what we do.
The one thing to do this week
Gather both incomes — your line 15000 total income and the best evidence you have of your spouse's — and run the without-children and with-children ranges before you say a single figure out loud to anyone. The person who walks into the conversation already knowing the range is the person who controls it.
Where Cairn helps next
This article gives you the framework. The free calculator turns it into your specific numbers — what you would actually pay each month, what would hit your account every two weeks. No email. No account.
- Your real Ontario support numbers in two minutes
- The cash-flow comparison with and without a tax adjustment
- A six-page PDF report you can email to yourself
- 14-day money-back promise if you take it further into a paid plan
Frequently asked questions
What are the grounds for spousal support in Ontario?
There are three: compensatory (you gave up career or earning capacity for the family), needs-based (one spouse cannot meet reasonable needs at the relationship's standard of living), or contractual (an agreement promises it). No entitlement means no support — a higher income alone does not trigger it.
What is the average spousal support payment in Ontario?
There is no fixed average. The Spousal Support Advisory Guidelines produce a low-to-high monthly range from the income difference and years of cohabitation — without children, roughly 1.5–2% of the gross income gap per year, capped at 50% of the gap. The mid-point is a negotiation, not a default.
How long does spousal support last in Ontario?
Without children, generally six months to one year of support for every year you cohabited. The Rule of 65 (cohabitation years plus the recipient's age at separation total 65+, marriage of at least 5 years) or a marriage of 20+ years can make it indefinite — meaning no fixed end date, not forever.
Is spousal support tax-deductible in Ontario?
Periodic spousal support paid under a written agreement or court order is tax-deductible to the payor and taxable to the recipient. Lump-sum support is not deductible, and post-1997 child support is tax-neutral. The deduction can cut the real cost of a $3,000/month obligation to roughly $1,800.
Can a court order more or less than the spousal support range?
Yes. The Guidelines are a guideline, not a cap. Courts depart from the range for a strong compensatory claim, heavy payor debt, a recipient's assets or earning capacity, or under-employment — where a court can impute a higher income and run the range off that figure.