Adult Interdependent Partner Alberta Estate Rights: Does Your Will Actually Cover Your Partner?

July 15, 2026

If you have lived with a partner in Alberta for years — or signed an adult interdependent partner agreement — you may assume your estate will automatically pass to them when you die. That assumption can be costly. Alberta's Adult Interdependent Relationships Act creates a legal category that sits entirely outside the federal common-law framework, and many Edmontonians only discover the gap when it is far too late to fix it.

What Is an Adult Interdependent Partner Under Alberta Law?

Alberta's Adult Interdependent Relationships Act, SA 2002, c A-4.5, defines an adult interdependent partner (AIP) as a person who is in a relationship of interdependence with another adult. That relationship can arise in two ways:

You have lived together in a relationship of interdependence for at least three continuous years; or
You have lived together in a relationship of some permanence and are the biological or adoptive parents of a child together; or
You have entered into a written Adult Interdependent Partner Agreement — regardless of how long you have lived together.

A relationship of interdependence means you share one another's lives, are emotionally committed to each other, and function as an economic and domestic unit. Crucially, you do not have to be in a conjugal relationship. Two adult siblings who have shared a home and finances for years could qualify — which is one reason this category surprises people.

This is entirely an Alberta creation. The federal Income Tax Act and federal pension legislation use the term "common-law partner," which generally requires 12 months of cohabitation in a conjugal relationship. The two categories do not map onto each other perfectly, and rights under one do not automatically follow from the other.

What Adult Interdependent Partner Alberta Estate Rights Exist Under the Wills and Succession Act?

Alberta's Wills and Succession Act, SA 2010, c W-12.2 (WSA), is the statute that governs what happens to an estate — both when someone dies with a will and when they die without one. Under the WSA, a surviving adult interdependent partner holds rights that are, in many respects, equivalent to those of a surviving spouse.
If There Is No Will (Intestacy)

When an Albertan dies without a valid will, the WSA's intestacy rules determine who inherits. A surviving adult interdependent partner is treated similarly to a surviving spouse. The distribution depends on whether the deceased also had a spouse at the time of death — the WSA does not allow a person to have both a spouse and an adult interdependent partner simultaneously for intestacy purposes, but the rules for competing claims can be technical.

In a straightforward intestacy where the deceased had an AIP and no spouse:

If there are no surviving descendants, the AIP inherits the entire estate.
If there are surviving descendants who are also the descendants of the AIP, the AIP still inherits the entire estate.
If there are surviving descendants who are not descendants of the AIP, the estate is divided — the AIP receives a preferential share (currently set by regulation) and then shares the remainder with those descendants.

These rules sound protective, but they only apply if the deceased is actually recognised as having been in an adult interdependent relationship at the time of death. Proving that status after the fact — without a written agreement — can require evidence of cohabitation, shared finances, and the nature of the relationship, which can be contested by other family members.

If There Is a Will

A will overrides the intestacy rules. That is the whole point of making one. But a will that was drafted years ago — before the relationship reached the three-year threshold, or before the parties signed an AIP agreement — may not name the partner at all, or may name them in a way that does not reflect the current relationship.

The WSA also contains a dependent's relief provision. If a will fails to make adequate provision for a surviving adult interdependent partner who was financially dependent on the deceased, that partner can apply to the court for a variation of the will. This is not a guaranteed outcome, and litigation is expensive and stressful. A properly drafted will is far less disruptive than a court application after death.

Why Long-Term Couples in Edmonton Are Often Caught Off Guard

Several common situations leave an adult interdependent partner worse off than they expected:

An old will names an ex-spouse or former partner. Under the WSA, marriage revokes a will, but the end of an adult interdependent relationship does not automatically revoke a bequest to a former AIP. The will needs to be updated.
No will exists and the relationship is disputed. Adult children from a prior relationship may challenge whether the surviving partner actually met the three-year threshold or whether the relationship was truly one of interdependence.
The will was drafted in another province. Other provinces do not have the AIP category. A will drafted in British Columbia or Ontario may not contemplate Alberta's distinct framework at all.
The couple signed an AIP agreement but did not update their wills to reflect it. The agreement establishes the legal relationship, but it does not itself transfer property on death.
Beneficiary designations on registered accounts and insurance policies were never updated. A will only governs assets that flow through the estate. RRSPs, TFSAs, RRIFs, and life insurance policies pass by beneficiary designation — and those designations operate independently of the will.

What Should You Do If You Are in an Adult Interdependent Relationship?

The practical steps below are not a substitute for legal advice tailored to your situation, but they give you a starting point for a conversation with a wills and estates lawyer.

Confirm your status. If you have not been together for three continuous years and have not signed a written AIP agreement, you may not yet qualify as an adult interdependent partner under the Act. If that is the case, your partner has no automatic inheritance rights under Alberta's intestacy rules.
Review or draft your will. A will that expressly names your adult interdependent partner and describes the relationship removes ambiguity. It should also address what happens if the relationship ends before your death.
Update your beneficiary designations. Check every registered account and insurance policy. These designations override your will and are often overlooked.
Consider an AIP agreement if you have not already signed one. A written agreement can establish the relationship immediately, without waiting for the three-year period to elapse. It can also set out each party's rights and obligations during the relationship.
Think about powers of attorney and personal directives. Estate planning is not only about what happens after death. If you are incapacitated, your partner will have no automatic authority to make financial or health decisions for you unless you have granted it in writing.

How Does Alberta's Framework Compare to Other Provinces?

Alberta is unusual in having a dedicated statute — the Adult Interdependent Relationships Act — that creates this category. Most other provinces use the term "common-law spouse" or "conjugal partner" and rely on cohabitation periods ranging from one to three years. Quebec operates under an entirely different civil law framework.

The practical consequence for Edmontonians who have moved from another province is that a will or beneficiary designation that referred to a "common-law spouse" under another province's law may or may not capture an adult interdependent partner under Alberta law, depending on how the document is worded. If you have relocated to Alberta, having your existing estate documents reviewed by an Alberta lawyer is worth doing sooner rather than later.

If you are in an adult interdependent relationship in Edmonton and are not certain your estate planning reflects that, speaking with a wills and estates lawyer can help you understand where the gaps are. The team at Cambria LLP works with Albertans on wills, estates, and probate matters — reach out to discuss your situation.