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Family Court Costs Orders in Ontario: Who Pays Whom

Understand how Ontario family judges decide costs under Rule 24, including offers to settle, bad faith and unreasonable behaviour, and how to prepare.

Family Law4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 1, 2026
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Key takeaways
  • Under the Family Law Rules, a successful party is presumed entitled to the costs of a step in a case.
  • Bad faith, unreasonable behaviour, divided success and not showing up or being unprepared can all change the result.
  • A properly made offer to settle can affect costs, so offers are worth understanding early.

Many people in family court worry less about losing than about being ordered to pay the other side's legal costs. A costs order is a payment one party is ordered to make toward the other's expenses of a step in the case.

Costs are governed by rule 24 of the Family Law Rules, O. Reg. 114/99. The rule was replaced in recent amendments, so older information you find online about offers and costs may be out of date. This article explains the general approach and when it changes. A lawyer can tell you how it applies to your facts.

The starting point: the winner usually gets costs

Family Law Rules r. 24(3) creates a presumption that a successful party is entitled to the costs of a step in a case. The court decides costs promptly after each step, or reserves them for later.

A presumption is a starting position, not a final answer. It means the judge begins from the idea that the winner is paid something, then looks at whether anything in the case points another way. Costs are usually decided step by step, so you can face a costs order after a motion long before the case ends.

When the usual result changes

SituationWhat the rule says
Divided successThe court may apportion costs as appropriate.
Winner behaved unreasonablyA successful party may be deprived of all or part of their costs.
Bad faithThe court must decide costs on a full recovery basis, payable immediately.
Absent or unprepared partyThe court must award costs against that party unless it orders otherwise in the interests of justice.
Child protection casesThe presumption that the successful party gets costs does not apply.

The practical lesson is that conduct matters, because unreasonable behaviour, bad faith, and not attending or not being prepared can each change the costs result. How this applies depends on your situation, so it is worth confirming with a lawyer.

How the judge sets the amount

In setting the amount, the court may consider the reasonableness and proportionality of each party's behaviour, the time spent, any written offers, legal fees and rates, other properly paid expenses, all relative to the importance and complexity of the issues, plus any other relevant matter.

Claims for fees and expenses must be backed by satisfactory documentation. If you are asking for costs, keep invoices and records. If you are facing a claim, you can look closely at whether the amount is proportionate to what was at stake.

Offers to settle and costs

An offer must be signed personally by the party making it and by their licensed representative. The making, withdrawal, acceptance and rejection of offers carry the costs consequences set out in rule 24.

A party who made an offer is entitled to costs up to the date the offer was served, and full recovery of costs from that date, if all of these apply:

The party claiming the benefit of an offer has the burden of proving that the order is as good as or better than the offer. Except at a binding judicial dispute resolution hearing, the judge sees the offers only after deciding the issues.

An offer can be withdrawn by serving a notice of withdrawal at any time before it is accepted. The only valid way to accept an offer is to serve an acceptance on the party who made it. An offer may not be accepted after the court begins to give a decision.

What to do next

Before each step, the parties must confer about costs, or make reasonable efforts to do so. This does not apply where a court order prohibits it or there is a risk of domestic violence.

Frequently asked questions

If I lose a motion, will I automatically pay the other side's costs?

Not automatically, but the starting presumption is that a successful party is entitled to costs. The judge can adjust that if success was divided or if the winner behaved unreasonably.

What happens if I miss a court step or am not prepared?

If a party does not appear at a step or is not prepared, the court must award costs against that party unless it orders otherwise in the interests of justice. Attending and preparing is one of the simplest ways to protect yourself.

Do costs apply in child protection cases?

The presumption that the successful party gets costs does not apply in child protection cases under the current rule 24. A lawyer can explain how costs may still be handled in your case.

Can a settlement offer help me on costs?

It can. If you made an offer on time, it was not accepted or withdrawn, and you then got an order as good as or better than the offer, you may be entitled to costs up to the offer date and full recovery after it. You carry the burden of proving the order was as good or better.

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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