Spousal support in Canada and the separation mistakes that cost money
How spousal support works in Canada, how Spousal Support Advisory Guidelines ranges are calculated, tax treatment and separation mistakes to avoid.
Spousal support in Canada is not automatic. A spouse must show entitlement, on compensatory grounds (career sacrifices during the relationship), needs-based grounds (the breakdown left them unable to support themselves), or a contract. Only then does the amount matter, and most lawyers and judges use the Spousal Support Advisory Guidelines (SSAG) to find a range. The SSAG are advisory, not law. Under the "without child support" formula, support is roughly 1.5% to 2% of the gross income difference for each year of cohabitation (up to 50%), for half a year to one year per year of the relationship, with indefinite duration for long relationships. Periodic support under a written agreement or order is generally taxable to the recipient and deductible to the payer; lump sums are not. The costliest mistakes are about timing, disclosure and paperwork.
Part of the overview of mistakes and official sources. General information, not legal advice.
Which law applies
| Couple | Law |
|---|---|
| Married, divorcing | Federal Divorce Act (s. 15.2) |
| Married, separated but not divorcing | Provincial law |
| Unmarried in Ontario | Family Law Act Part III: "spouse" includes partners who cohabited continuously for at least three years, or in a relationship of some permanence and are the parents of a child |
| Unmarried in BC | Family Law Act: marriage-like relationship of at least two years |
| Unmarried in Alberta | Family Law Act: adult interdependent partners |
| De facto spouses in Quebec | No spousal support between de facto spouses under the Civil Code; child support still applies. The 2025 parental union regime adds property sharing and a compensatory allowance (Civil Code arts. 521.43 ff.), not ongoing support; confirm on Québec.ca |
How the SSAG ranges work (illustrative)
Without child support
Amount: 1.5% to 2% of the gross income difference for each year of cohabitation, rising to a maximum range of 37.5% to 50% of the difference for relationships of 25 years or more, with the top end capped at the amount that would equalize net incomes. Duration: 0.5 to 1 year for each year of cohabitation; indefinite if the relationship lasted 20 years or more, or if years together plus the recipient's age at separation reach 65 ("rule of 65") and the relationship lasted at least five years.
Illustrative example. Sam earns $110,000 and Jordan $40,000; they lived together for 12 years and have no children.
- Gross income difference: $70,000.
- Low end: 1.5% × 12 = 18% → $12,600 a year ($1,050 a month).
- High end: 2% × 12 = 24% → $16,800 a year ($1,400 a month).
- Duration: 6 to 12 years.
With child support
When there is child support, the formula targets a share of the couple's individual net disposable income (after child support and taxes) for the recipient, generally between 40% and 46%. It needs software because of the tax and benefit calculations.
The SSAG ranges are a starting point. Courts adjust for the recipient's efforts to become self-sufficient, debts, property division and agreements. The Department of Justice publishes the SSAG and a user's guide.
Tax treatment
| Payment | Payer | Recipient |
|---|---|---|
| Periodic spousal support under a written agreement or court order | Deductible | Taxable |
| Lump-sum spousal support | Not deductible | Not taxable |
| Child support (agreements and orders since May 1997) | Not deductible | Not taxable |
| Payments before an agreement is signed | Deductible only if the agreement or order says so and conditions are met | Taxable in that case |
Register support agreements and orders with the CRA as required, and keep proof of payment.
Separation mistakes that cost money
1. No written agreement
Informal payments are not deductible, are hard to prove and leave both sides exposed. A separation agreement must be in writing, signed and witnessed to be enforceable under Ontario's Family Law Act.
2. Incomplete financial disclosure
Agreements signed without full disclosure can be set aside. Exchange tax returns, notices of assessment, pay stubs, pension statements and business records.
3. No independent legal advice
Each side should have their own lawyer review the agreement. A "kitchen-table deal" signed without advice is easier to challenge and may not hold.
4. Missing deadlines
- Ontario equalization: two years after divorce, six years after separation, six months after death.
- BC property and spousal support: generally two years after divorce or, for unmarried spouses, after separation.
- Ontario spousal support between unmarried partners: delay can reduce or defeat a claim even where no strict deadline applies.
5. Forgetting the estate side
On separation, also update your will, powers of attorney, RRSP, RRIF, TFSA, pension and insurance designations. In Ontario, the 2022 rules treat some separated spouses as predeceased under a will, but only after a qualifying event. See Ontario's 2022 changes.
6. Ignoring support security
If you receive support, ask for life insurance on the payer's life to secure it; support obligations may also survive death through dependants' claims. See dependants' relief claims.
7. Mixing property and support
Property division (equalization in Ontario, family property in BC, family patrimony in Quebec) is separate from support, though one affects the other. See family property division.
The 2021 Divorce Act changes
Since 1 March 2021, the Divorce Act uses parenting time and decision-making responsibility instead of "custody" and "access", puts the best interests of the child first, addresses family violence, and requires notice for relocations. These changes affect parenting, which in turn affects child and spousal support calculations.
FAQ
Can spousal support be changed later?
Yes, on a material change in circumstances, such as job loss or retirement, unless the agreement makes it non-variable. Courts are reluctant to override final settlements reached with legal advice.
Does remarriage end spousal support?
Not automatically. It may be a change in circumstances that justifies a variation.
Is mediation cheaper?
Often. Many provinces fund family mediation or offer subsidised services through court-based information centres.
Sources
- Department of Justice Canada — Spousal Support Advisory Guidelines and the Divorce Act
- Justice Laws — Divorce Act, s. 15.2
- Ontario e-Laws — Family Law Act, ss. 29–33, 55
- Family Law in BC — spousal support
- Canada Revenue Agency — support payments and tax
- Éducaloi — separation of de facto spouses in Quebec
