In Alberta, cohabitation agreements serve a critical role for couples who live together outside of marriage. Alberta law now grants adult interdependent partners many of the same rights and obligations as married spouses, particularly when it comes to property division and spousal support. This legal framework makes it more important than ever for unmarried couples to clarify their intentions through a well-drafted cohabitation agreement.

This article explains how cohabitation agreements work in Alberta, outlines the governing statutory authority, explores enforceability requirements, and highlights unique considerations under Alberta law.

Are Cohabitation Agreements Permitted in Alberta?

Yes. Cohabitation agreements are permitted and expressly recognized under Alberta’s Family Property Act, SA 2003, c F-4.7. This statute governs how property is divided when a relationship ends and allows parties to contract out of its default rules.

Under section 37 of the Family Property Act:

“Part 1 does not apply to property that is owned by either or both spouses or adult interdependent partners or that may be acquired by either or both spouses or adult interdependent partners, if, in respect of that property, the spouses or adult interdependent partners have entered into a subsisting written agreement with each other that is enforceable under section 38 and that provides for the status, ownership and division of that property.”

This provision confirms that unmarried spouses (i.e., adult interdependent partners) can sign enforceable agreements that override the property division regime otherwise applicable under the Act.

Cohabitation agreements are further supported by Alberta’s Adult Interdependent Relationships Act, SA 2002, c A-4.5, which defines the relationships to which many of these rights and obligations apply.

Who Qualifies as an Adult Interdependent Partner?

Alberta does not use the term “common-law partner” in its statutes. Instead, it uses “adult interdependent partner” (AIP). You may be an AIP if:

• You have lived with another person in a relationship of interdependence for at least 3 years, or
• You have lived together for less than 3 years but have a child together by birth or adoption, or
• You have signed an Adult Interdependent Partner Agreement

The rights of adult interdependent partners are extensive and often mirror those of married spouses, especially in areas of property division, spousal support, and estate law.

What Can a Cohabitation Agreement Cover in Alberta?

A cohabitation agreement in Alberta can cover:

• Ownership and division of property
• Classification of exempt vs. shared assets
• Spousal support (entitlement, amount, duration)
• Responsibility for debts and liabilities
• Financial responsibilities during the relationship
• Rights on separation or death

Like other provinces, Alberta does not permit parties to predetermine parenting arrangements or decision-making for children in a cohabitation agreement. These matters are governed by the Family Law Act, SA 2003, c F-4.5, and must be resolved based on the best interests of the child at the time of dispute.

What Makes a Cohabitation Agreement Enforceable in Alberta?

To be enforceable in Alberta, a cohabitation agreement must comply with specific formal and substantive requirements.

1. Formal Requirements

Under section 38 of the Family Property Act, a spousal (or adult interdependent partner) agreement is enforceable only if:

• It is in writing
• It is signed by both parties
• Each party has received independent legal advice (ILA)
• Each party’s lawyer has signed a certificate of independent legal advice

These formal requirements are strict. A court cannot enforce the agreement unless all four elements are satisfied. Section 38 of the Family Property Act provides:

“(1)  An agreement referred to in section 37 is enforceable if each party to the agreement has acknowledged, in writing, apart from the other party

(a)    that the party is aware of the nature and the effect of the agreement,

(b)    that the party is aware of the possible future claims to property the party may have under this Act and that the party intends to give up these claims to the extent necessary to give effect to the agreement, and

(c)    that the party is executing the agreement freely and voluntarily without any compulsion on the part of the other party.

(2)  The acknowledgement referred to in subsection (1) shall be made before a lawyer other than the lawyer acting for the other party or before whom the acknowledgement is made by the other party.

2. Independent Legal Advice

ILA is not optional under Alberta law for agreements that deal with family property. The lawyer must:

• Explain the nature and consequences of the agreement
• Ensure the client is entering the agreement voluntarily
• Sign a certificate of legal advice (usually attached as a schedule to the agreement)

This is a key difference from other provinces, where ILA is recommended but not required.

3. Full and Frank Financial Disclosure

Alberta courts have consistently held that failure to disclose significant assets, debts, or income can be grounds for setting aside a cohabitation agreement. The disclosure should be written, itemized, and ideally referenced in the agreement itself.

4. No Duress or Unconscionability

The agreement must be entered into freely and voluntarily. If there is evidence of coercion, pressure, or one party not understanding the agreement, a court may refuse to enforce it. Similarly, an agreement that is grossly unfair or unconscionable may be set aside under Alberta case law.

Can a Cohabitation Agreement Waive Spousal Support?

Yes. A cohabitation agreement in Alberta can include a clause that waives the right to spousal or partner support. Alberta courts have enforced such clauses, but they are not immune from challenge.

Courts may override a waiver if:

• There was inadequate disclosure
• The party did not receive proper legal advice
• The clause causes hardship at the time of enforcement
• The agreement was substantively unfair when made

That said, where both parties had legal advice and negotiated the agreement fairly, waivers of support are often upheld.

Can a Cohabitation Agreement Address Inheritance Rights?

Yes. In Alberta, adult interdependent partners have estate rights under the Wills and Succession Act, SA 2010, c W-12.2. A cohabitation agreement can be used to:

• Waive the right to inherit from a partner’s estate
• Define entitlement to specific assets
• Clarify intentions in the absence of a will

However, such clauses should be used in tandem with proper estate planning (e.g., a will or trust). An agreement alone may not be sufficient to fully displace statutory entitlements without a will to match.

What Happens if You Marry?

If the parties later marry, their cohabitation agreement remains valid only if it meets the formal requirements of a marriage agreement under the Family Property Act. This means:

• The agreement must already comply with section 38 (written, signed, ILA, legal certificates)
• It must not be expressly terminated by marriage
• The couple does not enter a new agreement that overrides the earlier one

For clarity, many Alberta lawyers include a clause confirming whether the agreement survives or terminates upon marriage.

Unique Considerations for Alberta

Alberta has several distinct features that impact cohabitation agreements:

1. Mandatory Independent Legal Advice

Unlike most provinces, Alberta requires ILA and legal certificates for any family property agreement to be enforceable. This is a hard legal requirement.

2. Adult Interdependent Partner Status

The term “common-law” has no legal meaning in Alberta legislation. Partners must qualify as AIPs before statutory rights arise. Agreements can be made before the AIP relationship begins and take effect once it qualifies.

3. Property Division Rules Are Broad

Under the Family Property Act, AIPs are subject to the same presumption of equal division of family property as married spouses. A cohabitation agreement is often the only way to opt out of this presumption.

4. Strong Support for Freedom of Contract

Alberta courts generally support private ordering. Provided the statutory requirements are met, parties have wide latitude to define their own terms—even if the result is unequal.

Best Practices When Drafting a Cohabitation Agreement in Alberta

• Ensure both parties receive independent legal advice, with signed certificates
• Exchange written financial disclosure, itemized by asset and liability
• Clarify what property is excluded and how it will be treated on separation
• Define how growth in excluded assets will be handled (shared or retained?)
• Include spousal support clauses, whether waived, capped, or conditional
• Specify whether the agreement remains valid upon marriage
• Avoid ambiguous or overly broad language that could cause enforcement issues

Conclusion

In Alberta, cohabitation agreements are not only permitted, they are essential for unmarried couples who want to retain control over their financial futures. With the introduction of the Family Property Act, adult interdependent partners now face many of the same legal consequences as married spouses upon separation. A properly executed cohabitation agreement allows couples to avoid the default rules and define their own arrangements.

To be valid in Alberta, a cohabitation agreement must be in writing, signed by both parties, supported by independent legal advice, and include lawyer-signed certificates. Full financial disclosure and fairness in negotiation are also crucial to enforceability.

You’re Invited to Call or E-Mail!

If you’re considering a cohabitation agreement — or have already made your decision — you’re invited to call or email us. We’ll explain for free how you can protect your assets and plan your estate. You can call us toll-free at (800) 407-2570 or email us using our contact form here. We can help you anywhere in Ontario, including Ottawa, Toronto, Mississauga, Brampton, and Hamilton.