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What Is Undue Hardship in Ontario Child Support Cases?

Learn what undue hardship means under the Child Support Guidelines, which circumstances may qualify, the standard of living test, and how to prepare a claim.

Family Law4 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • A court may award child support different from the Guideline table amount if the spouse making the request, or a child, would otherwise suffer undue hardship.
  • Circumstances that may cause undue hardship include unusually high reasonably incurred debts and unusually high costs of exercising parenting time.
  • A claim must be denied if the claiming spouse's household would have a higher standard of living than the other household after the Guideline amount is set.
  • An undue hardship order can set a reasonable time to satisfy the obligation causing the hardship.

A court can award child support that differs from the Guideline table amount in some situations. Sometimes paying that amount, or living on what you receive, would cause real hardship. The Guidelines allow for an exception, but it is a narrow one, and many people misunderstand it.

This article explains what undue hardship means, the circumstances the Guidelines list, the comparison test that can defeat a claim, and how people usually prepare. It is general information, and your facts matter.

What undue hardship means

On either spouse's application, a court may award a child support amount that differs from the table amount if the spouse making the request, or a child for whom the request is made, would otherwise suffer undue hardship. Either side can apply: a payor who cannot manage the table amount, or a recipient whose household faces unusual hardship.

The word undue matters. Ordinary strain after separation, such as higher living costs for two households, is not the same thing. The Guidelines set out circumstances that may cause undue hardship, and whether yours is one of them is worth confirming with a lawyer.

Circumstances the Guidelines list

The Guidelines say circumstances that may cause undue hardship include the following:

Whether your situation counts depends on the amounts and the facts. For example, whether a debt is unusually high and was reasonably incurred is something a court looks at closely, so records are important.

The standard of living test

Even if undue hardship is found, the application must be denied if the household of the spouse claiming hardship would, after the Guideline amount is set, have a higher standard of living than the other spouse's household. The court may use the comparison of household standards of living test in Schedule II of the Guidelines.

In practice this means a claim is not only about your own bills. The court may compare the standard of living of both households, so it is sensible to gather clear information about your own household's finances.

StepQuestion
1Does a listed circumstance, or similar hardship, exist?
2Would the claiming spouse or child suffer undue hardship at the table amount?
3Would the claiming household still have a lower or equal standard of living after the table amount is set?

What an order can look like

If a court awards a different amount for undue hardship, it may specify in the order a reasonable time for satisfying the obligation that causes the hardship, and the amount payable at the end of that time. This means the adjustment can be temporary, for example while a debt is being paid down.

Section 7 expenses, such as child care, health costs over insurance, and extraordinary educational or extracurricular costs, are handled separately and are generally shared in proportion to the spouses' incomes. If circumstances change later, the Guidelines define when an order can be varied, including any change that would result in a different child support order where the amount includes a table determination.

How to prepare a claim

The evidence you bring is what makes a claim credible. A lawyer can tell you what proof a court will expect for your type of claim.

Get legal advice before you reduce payments on your own. How this applies depends on your situation, so it is worth confirming with a lawyer.

Frequently asked questions

Can the person receiving support claim undue hardship?

Yes. Either spouse may apply, and the test looks at whether the spouse making the request, or a child for whom the request is made, would otherwise suffer undue hardship. The standard of living comparison still applies.

Is having a new baby or a new partner undue hardship?

The listed circumstances include a legal duty to support a child who is not a child of the marriage. Whether a particular situation qualifies depends on the facts, so it is worth confirming with a lawyer.

Is undue hardship permanent?

Not necessarily. A court may specify a reasonable time for satisfying the obligation that causes the hardship and the amount payable at the end of that time.

What if my household is better off than the other?

The application must be denied if the claiming spouse's household would have a higher standard of living than the other spouse's household after the Guideline amount is set.

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.

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