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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Family Law & Divorce Ontario » Subpoenaing a New Partner’s Financial Records in an Ontario Family Law Dispute

Subpoenaing a New Partner’s Financial Records in an Ontario Family Law Dispute

12 Jun 2026 4 min read No comments Family Law & Divorce Ontario
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In Ontario, judges will not automatically let you subpoena your ex-spouse’s new partner’s bank statements just because you are curious. You must legally prove that your ex is actively using their new partner to hide assets or artificially lower their income to avoid paying fair child or spousal support.

Moving on after a divorce is natural, but when an ex-spouse suddenly moves into a million-dollar home with a new partner while claiming they are too broke to pay child support, suspicions rightfully arise. In cities like Toronto, Vaughan, and Ottawa, it is not uncommon for a cunning ex to quietly transfer their business revenue into their new girlfriend’s or boyfriend’s bank account to make themselves look impoverished on paper. 👪

When this happens, you might want to demand the new partner’s financial records to prove the fraud. However, the Ontario family court system places a massive threshold on violating a third party’s privacy. A new spouse is not legally part of your divorce. Under the Ontario Family Law Rules, you cannot go on a “fishing expedition” through a stranger’s finances. Subpoenaing a new partner requires a highly strategic and heavily evidence-based legal motion.

Step-by-Step Process for Third-Party Disclosure

To access the financial records of a new partner, your law firm must use Rule 19 of the Family Law Rules (non-party production). Here is the rigorous step-by-step process required to convince a judge to grant this invasive order.

Step 1: Exhaust Direct Discovery Options

Before a judge will even look at a new partner, you must prove you tried everything else first. You must heavily question your ex-spouse under oath, review their CRA tax returns, and examine their personal bank statements. If there are obvious, unexplained transfers of large sums of money to the new partner, you have built the foundation of your case. 🔍

Step 2: Establish the “Relevance Test”

You cannot subpoena the new partner just because they are wealthy. You must prove that the new partner’s finances are directly relevant to a specific issue in your case, such as your ex’s true income for spousal support calculations, or uncovering a fraudulent conveyance of matrimonial property.

Step 3: Draft a Motion for Non-Party Production

Your lawyer will draft a formal Motion asking the Superior Court of Justice to order the new partner to produce specific documents, such as their bank statements or property deeds. The motion must be supported by a sworn affidavit outlining exactly why these documents are essential to uncover the truth. 📝

Step 4: Serve the New Partner

Because the new partner’s privacy is at stake, they must be formally served with your motion. They have the legal right to hire their own lawyer and show up in court to fight your request, arguing that the request is overly broad or an unfair invasion of their personal privacy.

Step 5: Argue the Privacy vs. Justice Balance

At the motion hearing, the judge will weigh two competing interests: the new partner’s right to privacy versus the court’s need to ensure fair child and spousal support. If the judge believes your ex is actively using the new partner as a financial shield, they will grant the order. However, the judge will likely restrict the disclosure to highly specific accounts and timeframes to minimize the privacy breach.

How Much Does it Cost in Ontario? 💲

Pursuing a third party in family court is a complex and expensive legal maneuver. Consider these costs before proceeding:

  • Drafting and Arguing the Motion: Having a lawyer prepare the extensive affidavits and argue the motion in court typically costs between $3,000 and $8,000 CAD.
  • Process Server Fees: Paying a professional to formally serve the new partner usually costs $100 to $250 CAD.
  • Risk of Cost Awards: If the judge decides your motion was just a vindictive fishing expedition, you could be ordered to pay the new partner’s legal fees, which can range from $2,000 to $5,000+ CAD.
Reason for SubpoenaWill an Ontario Judge Grant It?
Curiosity about their wealthNo. Dismissed as a fishing expedition.
Ex transferred $50k to them before separationYes. Highly relevant to property division.
Ex works “for free” at new partner’s businessYes. Relevant for imputing income for support.

How Long Does the Process Take?

Obtaining a court order against a third party is not a quick process. Gathering the initial evidence against your ex can take 3 to 6 months. Once your lawyer files the Motion for non-party production, securing a hearing date in a busy Ontario courthouse can take another 3 to 5 months. If the new partner fights the motion with their own lawyer, the delays can easily extend further.

Frequently Asked Questions (FAQ)

Does a new partner’s income affect my child support?

Generally, no. Under the Federal Child Support Guidelines, support is based purely on the biological parents’ incomes. A step-parent’s income only becomes relevant in very rare “undue hardship” claims where household standards of living must be compared.

Can I subpoena their credit card statements?

Only if you can prove your ex-spouse pays that credit card. If you show evidence that your ex is paying off the new partner’s Visa while claiming they cannot afford spousal support, a judge may order those specific statements produced.

Does the new partner have to show up in court?

They do not have to appear in person unless they want to fight the motion. If the judge grants the order, they simply have to produce the requested financial documents to your lawyer.

What if they refuse to hand over the documents?

If a Superior Court judge orders the new partner to produce bank statements and they refuse, they can be held in contempt of court, which carries severe financial penalties and possible jail time.

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