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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Family Law & Divorce Ontario » Child Custody & Support Ontario » Claiming ‘Undue Hardship’ to Lower Child Support Payments in Ontario

Claiming ‘Undue Hardship’ to Lower Child Support Payments in Ontario

13 Jun 2026 4 min read No comments Child Custody & Support Ontario
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In Ontario, claiming undue hardship to lower child support is extremely difficult. You must prove to the Superior Court of Justice or Ontario Court of Justice that paying the basic table amount causes exceptional financial distress, and that your household’s standard of living is actually lower than the receiving parent’s household.

When parents separate in Ontario, the Federal Child Support Guidelines provide a strict mathematical formula to calculate monthly payments based on gross income. The law assumes that both parents will share the financial burden of raising their children. However, life does not always fit neatly into a spreadsheet. Sometimes, a paying parent faces catastrophic financial circumstances that make paying the standard amount impossible without facing total ruin.

Whether you live in Toronto, Mississauga, or Ottawa, the courts enforce a rigid threshold for what qualifies as a valid exception. 📍 You cannot simply claim that your rent is too high or that groceries are expensive. You must meet the stringent legal test for undue hardship. Because the evidentiary burden is so high, we strongly advise consulting an experienced family lawyer from our directory before attempting to lower your payments.

Step-by-Step Process in Ontario to Claim Undue Hardship

Filing for undue hardship is not a casual request; it requires a formal legal application or a Motion to Change an existing order. You will need to lay bare your entire financial life before a judge.

Step 1: Identify a Qualifying Hardship Circumstance

The Guidelines outline specific scenarios that may qualify. 🔍 These include having unusually high debts incurred during the marriage to support the family, unusually high expenses to exercise your parenting time (such as expensive flights if the child lives far away), or a legal obligation to support a new spouse or children in a completely different household.

Step 2: Pass the Standard of Living Test

Even if you prove a qualifying circumstance, your claim will fail if you do not pass this mandatory mathematical test. You must prove that the standard of living in your current household is lower than the standard of living in the receiving parent’s household. If your ex-partner earns minimum wage and you earn a comfortable salary but have high debts, the court will likely deny your claim.

Step 3: Prepare Your Financial Statements

You must complete Form 13 or Form 13.1 (Financial Statement) for the Ontario family court. 📝 This requires attaching your last three Notices of Assessment from the Canada Revenue Agency (CRA), recent pay stubs, and absolute proof of your debts and expenses. Your law firm will help organize these documents, as missing evidence guarantees a dismissal.

Step 4: File the Motion at the Local Courthouse

Your lawyer will file your Motion to Change at the Superior Court of Justice or the Ontario Court of Justice, depending on where the original order was made. After serving the receiving parent, a judge will review both households’ incomes and expenses to make a binding decision.

How Much Does it Cost in Ontario?

Going to family court to lower your support payments requires a financial investment upfront. 💰 As of May 2026, here are the estimated costs in Canadian dollars:

  • Court Filing Fees: In Ontario, there is generally no government filing fee ($0 CAD) to file a basic Motion to Change child or spousal support.
  • Lawyer Fees: Hiring an Ontario family law firm to draft complex undue hardship arguments usually costs between $3,500 and $8,000 CAD.
  • Swearing Affidavits: If you use a notary public or commissioner of oaths, expect to pay around $40 to $70 CAD per document.
Expense TypeEstimated Cost (CAD)Notes
Court Filing Fee$0Family Court Motions are generally free
Lawyer Representation$3,500 – $8,000+Highly recommended for hardship cases
Financial Auditing$500 – $1,500If an accountant is needed for business income

How Long Does the Process Take?

Changing a court order takes patience. 🕑 Once you file your Motion to Change and serve the other parent, they have 30 days to respond. If they dispute your hardship claim, it may take 4 to 8 months to secure a hearing date before a judge in heavily backlogged courts like Toronto or Brampton.

During this waiting period, you are legally required to continue paying the current table amount. Failure to pay can lead to severe enforcement actions by the Family Responsibility Office (FRO), including the suspension of your driver’s licence.

Frequently Asked Questions (FAQ)

Does a new baby automatically qualify me for undue hardship?

No. While supporting a new child is a qualifying circumstance, you still must pass the strict Standard of Living test. If your new household makes more money than your ex-partner’s household, your support obligations for your first child will not be reduced.

Will the court consider my new spouse’s income?

Yes. In an undue hardship application, the court calculates the total household income. This means your new partner’s income will be directly factored into the Standard of Living test to see if you are truly suffering financial distress.

Can I claim hardship because my ex makes more money than me?

Generally, no. Child support table amounts are based almost entirely on the paying parent’s income. The receiving parent’s income only becomes relevant if there is shared parenting time (at least 40%) or if you are claiming undue hardship.

What happens if I just stop paying while waiting for court?

Stopping payments without a judge’s order is illegal. The Family Responsibility Office (FRO) will garnish your wages, intercept your CRA tax returns, and potentially seize your bank accounts. Always pay what you can while waiting for a legal modification.

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