Grounds for Divorce in Canada: Separation, Adultery, and Cruelty Explained

Understanding why and how a divorce is legally granted helps you plan your path forward. Here is what you need to know about the three grounds for divorce in Canada. For a broader overview of the entire process, see our guide to understanding the divorce process.

In Canada, the Divorce Act (section 8) establishes the legal grounds that must be proven before a court will grant a divorce. Unlike some other countries, Canada does not have a lengthy menu of fault grounds. There are only three recognized grounds: one year of separation, adultery, and physical or mental cruelty. Understanding these grounds, the evidence required for each, and the practical implications of choosing one over another is essential for anyone considering divorce.

The vast majority of Canadian divorces are granted on the basis of one year of separation. This is the simplest, least adversarial, and most common path. However, the other two grounds exist for situations where waiting a full year is not reasonable or where a spouse wants the court record to reflect the reasons for the marriage breakdown.

The Three Grounds at a Glance

Ground 1: One Year of Separation

Section 8(2)(a) of the Divorce Act provides that a divorce may be granted where the spouses have lived "separate and apart" for at least one year immediately preceding the determination of the divorce. This is the most straightforward ground and the one used in the overwhelming majority of cases.

What "Separate and Apart" Means

Living separate and apart means more than just physical distance. It requires at least one spouse to have the intention that the marriage is over, combined with a physical separation of lives. As discussed in section 8(3)(a), spouses can be considered separate and apart even while living under the same roof, provided they are no longer functioning as a married couple. This includes sleeping separately, managing finances independently, not sharing meals as a family unit, and not presenting themselves socially as a couple.

The 90 Day Reconciliation Provision

Section 8(3)(b) encourages reconciliation by allowing spouses to resume cohabitation for one period of up to 90 days without restarting the one year clock. If the reconciliation attempt fails and the couple separates again within those 90 days, the earlier period of separation still counts. However, if the reconciliation lasts longer than 90 days, the separation period resets entirely.

Evidence Required

For a separation based divorce, the evidence is relatively simple. You will need to provide an affidavit (a sworn statement) confirming the date of separation and that you have lived separate and apart for at least one year. In a joint application, both spouses confirm the separation date. In a sole application, the applicant provides their affidavit, and the respondent may confirm or dispute it. If the separation date is contested, the court may need to hear evidence from both parties and possibly third party witnesses.

Ground 2: Adultery

Section 8(2)(b)(i) allows a spouse to seek a divorce on the ground that the other spouse has committed adultery. Adultery means a voluntary sexual relationship between a married person and someone other than their spouse. Only the "innocent" spouse can rely on this ground. You cannot use your own adultery as a basis for your divorce application.

Why It Is Rarely Used

Although adultery allows a divorce to proceed without waiting one year, it is rarely used for several practical reasons. First, proving adultery requires either an admission from the other spouse or strong circumstantial evidence, which can be difficult and expensive to obtain. Second, raising adultery increases conflict and hostility, which can make it harder to negotiate other issues (property, support, parenting) cooperatively. Third, adultery has no effect on the financial outcome. Canadian courts do not consider marital misconduct when dividing property or calculating support, so proving adultery provides no financial advantage.

Evidence Required

If you choose to proceed on the ground of adultery, you will generally need one of the following: a written admission or acknowledgment from the other spouse, testimony from a witness who can attest to the relationship, or circumstantial evidence (such as photographs, messages, financial records showing hotel stays or gifts) that creates a strong inference. The third party involved in the adultery is not a party to the divorce proceeding and does not need to testify, though in some cases they may be called as a witness.

Ground 3: Physical or Mental Cruelty

Section 8(2)(b)(ii) provides that a divorce may be granted where one spouse has treated the other with physical or mental cruelty of such a kind as to render intolerable the continued cohabitation of the spouses. Like adultery, this ground allows for an immediate filing without a one year waiting period.

What Constitutes Cruelty

The threshold for cruelty under the Divorce Act is relatively high. Courts have held that the conduct must be serious enough that it makes continued cohabitation intolerable. A single incident of violence can be sufficient if it is severe. Mental cruelty typically requires a pattern of conduct over time, such as persistent emotional abuse, humiliation, controlling behavior, threats, or deliberate undermining of the other spouse's wellbeing. Ordinary marital disagreements, personality conflicts, or growing apart do not meet the legal standard for cruelty.

Evidence Required

Proving cruelty generally requires detailed evidence of specific incidents, their frequency, their impact on the applicant, and why continued cohabitation became intolerable. This may include police reports, medical records, counseling records, testimony from witnesses, photographs of injuries, and the applicant's own detailed affidavit. Because of the evidentiary burden, cruelty claims often result in a contested proceeding, which is more expensive and time consuming.

Choosing the Right Ground

For the vast majority of people, the one-year separation ground is the most practical choice. It avoids the evidentiary burden of proving adultery or cruelty, reduces conflict, and does not require the other spouse's cooperation or admission. Since adultery and cruelty have no effect on financial outcomes in Canada, the primary reason to use these grounds is to avoid the one year wait. If both parties agree on all issues, an uncontested divorce may be the simplest path forward. If you're looking for a family lawyer to guide you through the process, browse family lawyers across Canada.

If you are in a situation involving family violence or where waiting one year is genuinely problematic, consult with a family lawyer about whether proceeding on the ground of cruelty is appropriate. Similarly, if your spouse has admitted to adultery and both of you want a faster resolution, the adultery ground may be considered. In all cases, the practical benefits of the faster timeline must be weighed against the increased cost, conflict, and complexity of proving a fault ground.

The 2021 Amendments and Modern Context

The 2021 amendments to the Divorce Act introduced significant changes to how family law cases are handled, including a new emphasis on family dispute resolution (section 7.3), a detailed framework for addressing family violence (section 16(4)), and updated terminology for parenting arrangements. However, the grounds for divorce themselves were not changed. The three grounds established in section 8 remain the same as they have been since 1985.

What has changed is the broader context in which divorce proceedings take place. The 2021 amendments encourage a less adversarial approach, emphasize the best interests of children, and impose duties on lawyers to encourage resolution (section 7.7). These changes make the cooperative, separation based ground even more aligned with the spirit of the modern Act, while the fault grounds remain available for situations that genuinely require them.

Key Takeaways

This content is for informational purposes only and does not constitute legal advice. Laws vary by province and individual circumstances. Consult a qualified family lawyer for advice specific to your situation.