Adult Interdependent Partner Property Division in Alberta

Alberta doesn't use the term "common-law spouse" in its legislation. Instead, the province has a distinct legal category — the Adult Interdependent Partner (AIP) — and since the Family Property Act replaced the Matrimonial Property Act on January 1, 2020, AIPs have the exact same property division rights as legally married couples. If you're ending a long-term relationship in Alberta without having been married, here's what that means for your assets.

Qualifying as an Adult Interdependent Partner

You're legally recognized as an AIP if you meet any one of these three criteria:

Three-year cohabitation. You've lived together in a conjugal relationship for at least three continuous years. The relationship must be conjugal — roommates sharing rent don't qualify, regardless of how long they've lived together.

Child together plus permanence. You've lived together in a relationship of some permanence and have a child of the relationship together. There's no minimum time requirement here — having a child together shortens the threshold.

Written AIP agreement. You've both signed a formal Adult Interdependent Partner Agreement in the prescribed statutory form. This is essentially Alberta's version of a registered domestic partnership.

Equal Division Applies

Once you qualify as an AIP, the Family Property Act's three-tier division system applies to your property exactly as it would for a married couple:

• Tier 1 (50/50 presumption): All family property acquired during the relationship is presumed to be divided equally, regardless of whose name is on the title
• Tier 2 (exempt property): Pre-relationship assets, inheritances, third-party gifts, and personal injury settlements remain with the original owner
• Tier 3 (increased value): Growth on exempt property during the relationship is divided on a "just and equitable" basis

This was a major change from the old Matrimonial Property Act, which only covered legally married couples. Before 2020, common-law partners in Alberta had to rely on unjust enrichment claims — expensive, uncertain litigation with no presumption of equal sharing. The FPA eliminated that disparity.

Key Differences from Married Couples

While property division rules are identical, a few important distinctions remain:

No Dower Act protection. The Dower Act only applies to legally married couples. If your AIP owns the family home solely in their name, they can sell it without your written consent. Married spouses have automatic dower protection against this.

CPP credit splitting timeline. Divorced couples face no time limit for CPP credit splitting applications. But unmarried AIPs must apply to Service Canada within 48 months of their physical separation date. Miss this deadline and you may lose the right to split CPP credits unless your former partner signs a formal waiver.

No divorce judgment anchor. The two-year limitation period for property claims runs from the date of physical separation for AIPs, not from a divorce judgment (since there's no divorce to finalize). This means the clock starts the day you physically separate.

No marriage certificate. For disclosure and court filings, you'll need alternative evidence to prove the relationship existed and when cohabitation began — lease agreements with both names, utility bills, statutory declarations from witnesses, or a signed AIP agreement.

Proving When Cohabitation Started

The start date of cohabitation determines which assets are pre-relationship (exempt) and which are family property (divisible). Unlike marriage, where a certificate establishes the exact date, the start of cohabitation can be disputed. Gather documentary evidence: joint lease agreements, shared utility accounts, insurance policies listing both names, or correspondence referencing when you moved in together.

Protecting Yourself with an AIP Agreement

A written AIP agreement serves two purposes. First, it establishes the legal status of the relationship (useful if you haven't hit the three-year threshold or don't have children together). Second, it can include property division terms — similar to a prenuptial agreement for married couples — that override the FPA's default equal-sharing presumption.

Like all family property agreements in Alberta, an AIP agreement must be accompanied by independent legal advice for both parties and separate written acknowledgements to be enforceable.

Planning Your Division

The Alberta Divorce Financial Split Guide covers AIP property division alongside married-couple division, with worksheets for documenting cohabitation dates, classifying assets into the FPA's three tiers, and building the financial disclosure package you'll need — whether you're negotiating through mediation or filing with the court.

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