TREADSTONE LAW · ONTARIO · DIGITAL LEGAL SERVICES · EST. MMXXI ·TSL
Licensed by the Law Society of OntarioFlat fees published upfrontWe reply to messages within 1 business daySign in
Home/Articles/Family Law
№ 77 Family Law

Spousal Support Without Child Support Formula Explained

How the SSAG without-child-support formula sets spousal support amount and duration in Ontario, including the 20-year rule and the rule of 65.

Family Law5 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
← All articles
Key takeaways
  • The without-child-support formula sets both amount and duration, and both increase with the length of the relationship.
  • Support can be indefinite when the relationship lasted 20 years or more, or when the rule of 65 applies.
  • Indefinite support does not necessarily mean permanent support.
  • The formula applies only after entitlement has been proven or agreed.

The Spousal Support Advisory Guidelines include what is called the without-child-support formula, and the guidelines also have a separate with-child-support formula. Which one fits your situation depends on the facts, so it is worth confirming with a lawyer. It is the simpler of the two main formulas, and it is the one most online searches are really asking about.

This article walks through how it works in plain language: when the formula even comes into play, how the length of the relationship drives the result, and what indefinite support does and does not mean.

First, entitlement: the formula is not the starting point

The SSAG are not law, though judges often base decisions on them. They also do not decide whether you have a right to support. Entitlement must be proven or agreed before the formulas apply.

There are three types of entitlement. Compensatory support rests on economic loss or disadvantage from relationship roles. Non-compensatory support rests on need, such as a significant drop from the marital standard of living. Contractual support rests on a domestic contract or implied agreement.

Ontario.ca describes similar ideas: a claimant must show a relationship role that prevented building their own career, a need for support after separation while the other spouse can pay, or a legal agreement providing for support on separation. Marriage is not the only route. Unmarried partners can claim if they lived together as a couple for at least three years, or if they were in a relationship of some permanence of any length and had a child together.

How length of relationship drives amount and duration

Under this formula, amount and duration both increase with the length of the relationship. The length is measured from the start of cohabitation, including pre-marital cohabitation, to the date of separation, not the date of divorce. If there was a reconciliation, cumulative periods usually count.

For marriages of 25 years or more, the amount range is 37.5 to 50 per cent of the gross income difference. The formula also uses a net income cap, meaning the recipient should not end up with more than 50 per cent of the spouses' net disposable income. Percentages for shorter relationships are worth confirming with a lawyer or in the guidelines themselves, because they differ from the longer-marriage figures.

The guide offers a rough hand estimate for the amount: 48 per cent of the gross income difference. It calls this a second-best, but adequate, alternative to software. Treat it as a way to sense the scale of a number, not as an answer.

Duration: time limits, the 20-year rule and the rule of 65

Time limits apply under the formula when the relationship is under 20 years and the rule of 65 does not apply. Duration is indefinite when the relationship lasted 20 years or more, or when the rule of 65 applies.

The rule of 65 applies when the years of relationship plus the recipient's age at separation equal or exceed 65. It uses age at separation, not age at trial, and it does not apply to marriages under 5 years.

SituationDuration under the formula
Relationship under 20 years, rule of 65 does not applyTime limits apply
Relationship of 20 years or moreIndefinite
Years together plus recipient's age at separation total 65 or moreIndefinite, but the rule does not apply to marriages under 5 years

Indefinite support does not necessarily mean permanent support. Indefinite orders remain subject to variation and review.

Where in the range you land, and when the formula stops working

The formula produces a range. Factors that push the amount higher include depth of need, a strong compensatory claim, the recipient's retraining or education, high medical costs and a low estimate of the payor's income. Factors that push it lower include a weak compensatory claim, payor work incentives, a large property settlement, the recipient's ability to earn more, high access costs, the recipient's repartnering, and mandatory pension contributions reducing payor cash flow. The midpoint should not be treated as the default.

If a payor's income drops significantly, the ranges move down, and ability to pay can reduce the range to zeros across the board. Voluntary under-employment may be an issue.

Practical next steps

Frequently asked questions

Does the without-child-support formula apply if my children are grown?

That depends on the facts, including whether child support is part of the picture. The guide treats the with-child-support formula as using two duration tests, length of marriage and age of children. A lawyer can confirm which formula fits your situation.

What is the rule of 65?

It applies when the years of relationship plus the recipient's age at separation equal or exceed 65, and it does not apply to marriages under 5 years. When it applies, duration is indefinite under this formula.

Does indefinite support last forever?

No, not necessarily. Indefinite orders remain subject to variation and review.

Can a court order less than the formula range?

The guidelines are not law, but the range is not the whole story. Factors such as a large property settlement or payor work incentives can push an amount lower within the range. For a payor earning between $20,000 and $30,000, ability to pay and work incentives may justify awards below the formula ranges, and below $20,000 support is not generally payable. How this applies to you depends on your situation, so it is worth confirming with a lawyer.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

This is a family law question

Start a file online — flat, published fees, reviewed by a licensed lawyer before a dollar is owed.

ContactStart a File →