Spousal support and child support are two separate legal obligations in Ontario — with different rules, calculations, and tax treatment. Understanding the difference is critical to protecting your rights.
Child support is a right of the child — calculated using the Federal Child Support Guidelines based on the payor's income. Spousal support (sometimes called alimony) compensates a spouse for economic disadvantage from the marriage — calculated using the Spousal Support Advisory Guidelines. They are separate obligations with different rules, and child support takes priority when both are owed.
The key differences between child support and spousal support in Ontario at a glance.
| Aspect | Child Support | Spousal Support |
|---|---|---|
| Purpose | Meets the child's basic needs and maintains their standard of living | Compensates a spouse for economic disadvantage caused by the marriage |
| Who Benefits | The child — not the receiving parent | The lower-earning or economically disadvantaged spouse |
| Calculation Method | Federal Child Support Guidelines — table amount based on payor income | Spousal Support Advisory Guidelines (SSAG) — range based on incomes and marriage length |
| Tax Treatment | Not deductible by payor, not taxable to recipient | Deductible by payor, taxable to recipient (periodic payments) |
| Can Be Waived? | No — parents cannot waive child support | Yes — spouses can waive spousal support by agreement |
| Priority | Takes priority over spousal support | Secondary to child support obligations |
| Duration | Until child is no longer a "child of the marriage" | Varies — often half the length of the marriage for shorter marriages |
| Governing Law | Divorce Act / Family Law Act + Federal Guidelines | Divorce Act / Family Law Act + SSAG |
Under both the Divorce Act and the Family Law Act, child support takes priority over spousal support. This means that if a payor cannot afford both, child support must be paid first.
Courts will not reduce child support to fund spousal support. However, the existence of a spousal support obligation can affect the calculation of child support in shared custody situations.
Important: A payor who reduces child support to pay spousal support is in breach of their legal obligations. Child support arrears accumulate and are enforced by the Family Responsibility Office.
Always paid first. Cannot be waived or reduced to fund spousal support.
Calculated after child support. Can be waived by agreement. Affected by child support obligations.
Yes. Child support and spousal support are separate obligations. You can receive both simultaneously. Child support is calculated first, and spousal support is then determined based on the remaining financial circumstances.
Correct. Spouses can agree to waive spousal support in a separation agreement. However, child support cannot be waived — it is a right of the child, not the parent, and courts will not enforce a waiver of child support.
In some cases, yes. The SSAG "with child support" formula accounts for child support obligations when calculating spousal support. The interaction between the two can be complex and requires careful calculation.
"Alimony" is an American term. In Canada, the correct term is "spousal support." They refer to the same concept — financial support paid by one spouse to the other after separation or divorce.
Child support continues until the child is no longer a "child of the marriage" (typically age 18, or longer if in school). Spousal support duration varies — for shorter marriages, it is often half the length of the marriage. For longer marriages, it may be indefinite.
Written & Reviewed By
Founder & Managing Director, Tailor Law · Mississauga, Ontario
Deepa Tailor is a leading Ontario family law lawyer with extensive experience in both child support and spousal support matters. She founded Tailor Law to provide accessible, high-quality family law services across the GTA.
View Full BioOur lawyers will calculate both your child support and spousal support obligations accurately — and ensure you are not paying more than the law requires.
We apply both the Child Support Guidelines and SSAG correctly
We ensure child support is properly prioritized
We draft enforceable separation agreements covering both obligations