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Find a Lawyer » Canada Legal Guides » New Brunswick Legal Guides » Family Law & Divorce New Brunswick » Divorce & Separation Guides New Brunswick » What Are the Legal Grounds for Divorce Under the Divorce Act in New Brunswick?

What Are the Legal Grounds for Divorce Under the Divorce Act in New Brunswick?

23 May 2026 4 min read No comments Divorce & Separation Guides New Brunswick
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Under the Canadian Divorce Act, there is only one legal ground for divorce: marriage breakdown. In New Brunswick, you can prove this breakdown in one of three ways: a one-year separation, adultery, or intolerable cruelty. Over 90% of couples choose the one-year separation to avoid costly, fault-based court battles.

When you decide to end your marriage in New Brunswick, you must provide the Court of King’s Bench with a legally valid reason. Under the federal Divorce Act, which applies consistently across Canada, the sole ground for divorce is the “breakdown of the marriage.” Unlike the complex systems in some other countries, Canadian family law is designed to be relatively straightforward and primarily focused on no-fault resolutions.

Understanding how to prove this marriage breakdown is vital for a smooth process. 📖 While the law provides three distinct pathways to prove the breakdown, the choice you make dramatically impacts the cost, duration, and emotional toll of your case. Working with a local family lawyer in Fredericton, Saint John, or Moncton can help you determine the most strategic path for securing your spousal support and finalizing your divorce.

The Three Ways to Prove Marriage Breakdown in New Brunswick

The federal law is very specific about what constitutes a marriage breakdown. 📍 You cannot simply tell a judge that you have “fallen out of love” or cite irreconcilable differences without meeting one of the three statutory criteria. The Court of King’s Bench will only grant your Divorce Order if you successfully establish one of the following scenarios.

1. One-Year Separation (No-Fault)

This is by far the most common method used in Canada. You simply need to prove that you and your spouse have lived separate and apart for at least one full year immediately preceding the determination of the divorce. You can even live under the same roof, provided you maintain entirely separate financial and social lives and do not share a bedroom.

2. Adultery (Fault-Based)

If your spouse commits adultery, you can file for divorce without waiting the mandatory year. 💔 However, you cannot file under this ground if you are the one who cheated, or if you forgave the affair and continued the marriage. Proving adultery usually requires a sworn affidavit from the cheating spouse admitting to the act; without their admission, hiring private investigators makes this a very expensive route.

3. Physical or Mental Cruelty (Fault-Based)

You can seek an immediate divorce if your spouse has treated you with physical or mental cruelty of such a severe nature that continued cohabitation is impossible. This is a high legal threshold. You must provide significant evidence, such as police reports, medical records, or witness testimonies. Judges in New Brunswick take these allegations seriously, but the burden of proof rests entirely on the applicant.

How Much Does it Cost in New Brunswick?

The financial cost of your divorce is heavily influenced by the legal ground you select. Choosing a fault-based ground often explodes your legal fees because you are paying a lawyer to prove wrongdoing in a courtroom.

  • No-Fault Court Fees: The basic filing fee at the Court of King’s Bench is roughly $110 CAD, plus $7 CAD for the federal clearance certificate.
  • No-Fault Legal Fees: Drafting a standard separation agreement and filing uncontested paperwork usually runs between $1,500 and $3,500 CAD.
  • Fault-Based Legal Fees: If you file under adultery or cruelty and your spouse contests it, trial preparations and litigation can quickly cost upwards of $15,000 to $30,000 CAD per person.
Legal GroundWaiting PeriodBurden of Proof
One-Year Separation12 months mandatoryLow (Affidavit of separation)
AdulteryNone (Immediate)High (Admission or evidence)
CrueltyNone (Immediate)Very High (Police/medical records)

How Long Does the Process Take?

In theory, filing for a fault-based divorce (adultery or cruelty) allows you to bypass the mandatory one-year wait. ⌛ However, the practical reality of the Canadian judicial system tells a different story. Contested fault-based divorces require court dates, evidence gathering, and trials.

Because of routine court backlogs in New Brunswick, fighting over adultery or cruelty can drag your case out for two to three years. Conversely, most applicants who choose the no-fault one-year separation route find that their divorce is finalized administratively within 2 to 4 months after the one-year anniversary of their separation date.

Frequently Asked Questions (FAQ)

Does proving adultery mean I will get more spousal support?

No. Under the Canadian Divorce Act, spousal support, child support, and property division are completely no-fault. A judge will not punish a cheating spouse by awarding you more money or assets.

Do I need photographic evidence of the affair?

Generally, no. The easiest way to prove adultery is to have the spouse who committed the affair sign a sworn affidavit admitting to it. Without this admission, proving it becomes very costly and complex.

Will bad behaviour affect my parenting time?

Past behaviour only affects parenting time or decision-making responsibility if that behaviour directly impacts the safety or well-being of the child. Standard adultery does not automatically make someone an unfit parent.

Can I file for divorce right away if my spouse is abusive?

Yes, you can file immediately under the ground of physical or mental cruelty. However, your safety is the priority; you should contact local New Brunswick authorities or a shelter before initiating legal action.

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