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Grounds for Divorce in Alberta Under the Divorce Act

Understand the grounds for divorce in Alberta under the Divorce Act: one year of separation, adultery and cruelty, and which one may fit your situation.

Family Law4 min readTSLBy the Treadstone Law Team · AlbertaUpdated November 6, 2026
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Key takeaways
  • The only ground for divorce is breakdown of the marriage.
  • Breakdown is established in three ways: one year of separation, adultery or cruelty.
  • Adultery and cruelty do not require a year of separation first.

If you are separating, you may wonder whether you have to prove your spouse did something wrong. The federal Divorce Act has one ground, and it is proven in one of three ways.

Knowing which route fits you helps you plan your timing and your paperwork. This article explains each one in plain language.

This article covers the law of Alberta.

The single ground: breakdown of the marriage

A court may grant a divorce on application by either or both spouses on the single ground that the marriage has broken down. Breakdown is established only in the three ways described below. Before any of this, one spouse must have been habitually resident in Alberta for at least one year before the proceeding starts.

Only one spouse needs to meet the one-year residence test. The Divorce Act uses the words 'habitually resident', and the Court's joint-divorce instructions put it as one of you having lived in Alberta for one full year before filing. Different tests apply to support or parenting orders sought on their own after a divorce, and to some spouses who were married in a Canadian province but do not live in Canada.

Separation for one year

You must have lived separate and apart for at least one year immediately before the divorce is decided, and have been living apart when the proceeding started. You can start the divorce early, but you cannot ask for the Divorce Judgment until the year has passed.

Adultery

Breakdown can be shown if the respondent has committed adultery since the marriage. You do not have to wait a year first. The Court's desk-divorce instructions note that in most cases the other spouse must be willing to sign an affidavit admitting it.

Physical or mental cruelty

The third way is that the respondent has treated the other spouse with physical or mental cruelty that makes continued cohabitation intolerable. As with adultery, no year of separation is needed first.

Starting the claim and when the divorce takes effect

The Court of King's Bench of Alberta has sole jurisdiction over divorce, and the Court of Justice cannot grant one. A one-spouse divorce starts with the Statement of Claim for Divorce, Form FL-01, under Rule 12.7 of the Alberta Rules of Court. Spouses who agree can apply together using the Joint Statement of Claim for Divorce, Form FL-08, and no service on a defendant is needed.

The Court's instructions say the plaintiff cannot serve the Statement of Claim personally, that a third party must do it, and that the Court strongly recommends hiring a process server. The claim must be served within one year after it is filed, although the Court can extend that time on an application filed before the year runs out.

A divorce takes effect on the thirty-first day after the day the judgment granting it is rendered, whichever ground is used. A court can make it take effect earlier only if it finds special circumstances and the spouses agree and undertake that no appeal will be taken, and a pending appeal can delay it. In Alberta, after the Divorce Judgment is signed, you wait 31 days and then request the Certificate of Divorce through the online request form on the Court of King's Bench website. Once a divorce takes effect, it has legal effect throughout Canada.

Which ground fits, and what to do next

GroundWait needed?Practical point
One-year separationYes, before the judgmentDoes not depend on blame
AdulteryNoOften needs an admission affidavit
CrueltyNoMust make cohabitation intolerable

Many people choose separation because it does not depend on proving fault. How the choice applies to you depends on your situation, and a lawyer can help you weigh the options if timing, safety or evidence is a concern.

Frequently asked questions

Do I need to prove who was at fault?

Not if you rely on one year of separation, which is one of the three ways to show breakdown. Adultery and cruelty are alternatives that do not require a year of separation first.

Can we be separated while living in the same house?

Yes, but only if you are in fact living apart. That is a question of fact for the court.

Does a failed reconciliation restart the year?

Not if you lived together again for no more than ninety days in total with reconciliation as the main purpose.

Can I file before the year is up?

Yes, if you rely on separation. You cannot ask for the Divorce Judgment until the year has passed.

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. Alberta 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 lawyer who practises in Alberta. Reach us at 1-844-900-1070 or send our Team a message.

This is a family law question

An uncontested divorce with us is from $1,678.95, tax included. Third-party fees are extra.

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