Ontario Canadian Spousal Support (SSAG) Estimator

Ontario spousal support is calculated using the Spousal Support Advisory Guidelines (SSAG), which are advisory but widely followed by courts. The without-child formula allocates 1.5% to 2.0% of the gross income difference for each year of marriage, capped at 37.5% to 50% after 25 years. The with-child formula uses Individual Net Disposable Income (INDI)—gross income minus child support minus taxes plus benefits—targeting 40% to 46% of combined INDI for the recipient. While not legally binding like child support guidelines, the SSAG provides the starting point for virtually all Ontario spousal support negotiations and court decisions.

The Rule of 65 provides indefinite spousal support when the years of marriage plus the recipient's age at separation equals or exceeds 65, even for marriages shorter than 20 years. For example, a recipient age 50 at separation after a 15-year marriage (50 + 15 = 65) qualifies for indefinite support. The marriage must last at least 5 years for this rule to apply; short marriages under 5 years are excluded. Indefinite support does not mean permanent—it means no time limit is set initially, but support can still be reduced or terminated if the recipient achieves self-sufficiency.

Under the SSAG, spousal support duration ranges from 0.5 to 1.0 years for each year of marriage using the without-child formula. For a 12-year marriage, duration would range from 6 to 12 years. Support becomes indefinite (no specified time limit) for marriages lasting 20 years or longer, or when the Rule of 65 applies (marriage years plus recipient's age at separation ≥ 65). Even with indefinite support, courts may reduce or terminate payments if the recipient becomes self-sufficient or circumstances change materially.

Yes, periodic spousal support payments in Ontario are fully tax-deductible for the payor (claimed on line 22000 of the tax return) and taxable income for the recipient (reported on line 12800). This tax treatment applies only to periodic payments made under a written agreement or court order. Lump-sum spousal support payments are neither tax-deductible nor taxable. This represents a critical difference from the United States, where spousal support (alimony) has been non-deductible and non-taxable since 2019 for post-2018 divorces.

The SSAG without-child formula calculates spousal support as 1.5% to 2.0% of the gross income difference between spouses for each year of marriage (or cohabitation). The range maxes out at 37.5% to 50% of income difference for marriages of 25 years or longer. For a 10-year marriage with a $50,000 CAD income gap: 10 × 1.5% = 15% to 10 × 2.0% = 20%, yielding $7,500 to $10,000 CAD annually. This formula applies when there is no child support obligation between the spouses.

The SSAG with-child formula uses Individual Net Disposable Income (INDI) rather than gross income percentages. INDI is calculated as gross income minus child support obligations minus taxes and deductions plus government benefits and credits for each spouse. Spousal support is then transferred incrementally until the lower-income spouse receives 40% to 46% of the combined INDI. This formula accounts for the tax consequences and government benefits associated with both spousal support and child support, producing net income equalization between the spouses rather than gross income sharing.

Yes, spousal support can be modified in Ontario when there is a material change in circumstances, such as job loss, significant income increase, retirement, illness, or the recipient's cohabitation with a new partner. Either party can apply to court for variation or termination of support. Even in cases of indefinite support, courts may reduce or terminate payments if the recipient becomes self-sufficient. Modifications require either a new written agreement between the parties or a court order; unilateral changes to support payments without legal authorization constitute breach of the existing order.

Yes, common-law partners in Ontario can claim spousal support under the Family Law Act if they cohabited continuously for at least three years, or if they have a relationship of some permanence and are the natural or adoptive parents of a child together. The SSAG formulas apply equally to common-law and married couples; the calculation uses years of cohabitation rather than years of marriage. Common-law partners have the same entitlement to compensatory support (for economic disadvantage from the relationship) and needs-based support (for financial hardship) as married spouses, though property division rules differ significantly.