Cohabitation Agreement (Quebec)

A Quebec cohabitation agreement (accord de cohabitation or convention d'union de fait) is a legally binding private contract between two partners who choose to live together without marrying or entering into a civil union. Under Quebec civil law, a cohabitation agreement is essential because de facto spouses (conjoints de fait) — unlike their counterparts in common law provinces — do not automatically benefit from the protections available to married couples or civil union spouses. Specifically, articles 414 to 426 of the Civil Code of Quebec (C.c.Q.), which establish the family patrimony regime, do not apply to de facto spouses. This means there is no automatic equal division of the family residence, furniture, registered retirement savings plans, or other family assets upon separation. Similarly, article 585 C.c.Q., which imposes a mutual obligation of spousal support, applies only to married couples and civil union partners, not to de facto spouses.

A cohabitation agreement fills these legal gaps by allowing partners to voluntarily establish the rules that will govern their life together and protect each partner upon separation. The agreement is governed by the general principles of Quebec contract law, particularly articles 1375 (good faith), 1378 (freedom of contract), and 1385 and following (formation of contracts) of the C.c.Q. The agreement takes legal effect as soon as both parties sign it and can be signed with or without witnesses or notarial authentication, although consultation with a notary or lawyer is strongly recommended.

An important development in Quebec family law occurred on June 30, 2025, when the new parental union regime (arts. 521.46 to 521.66 C.c.Q.) came into force. This regime automatically grants certain protections — similar to those enjoyed by married couples — to de facto spouses who become the parents of a common child born on or after that date. These protections relate notably to the family residence and may affect the property arrangements established in a cohabitation agreement. Couples with children or expecting children should therefore review their cohabitation agreement in light of this new regime.

A cohabitation agreement is needed by any couple in Quebec who chooses to live together in a de facto union without marrying. Given that Quebec law provides significantly fewer automatic protections to de facto spouses than to married couples, this agreement is particularly critical in the following situations.

First, when either partner owns significant assets, has debts, or receives an inheritance, a cohabitation agreement prevents disputes by clearly establishing which assets belong to whom and how they will be treated during and after the relationship. Without such an agreement, each partner risks losing assets they contributed to the common household, or conversely, becoming liable for the other's debts.

Second, when the couple acquires a family residence or major property together, or when one partner moves into a property owned by the other, the agreement establishes each partner's rights regarding occupation and disposition of that property. Without it, the partner who is not on the title has no legal right to remain in the home upon separation.

Third, couples who have children together — especially those whose children were born before June 30, 2025 and who are therefore not covered by the new parental union regime — should have a cohabitation agreement that addresses custody, child support, and the family residence in case of separation.

Fourth, when one partner sacrifices career advancement or income to support the other's career or to care for children, a cohabitation agreement can provide for a compensatory payment or spousal support upon separation, which would otherwise not be available under Quebec law.

Finally, the agreement is useful at the start of any long-term cohabitation to establish clear expectations regarding expense sharing, property ownership, and the management of joint finances, preventing misunderstandings and conflicts before they arise.

A comprehensive Quebec cohabitation agreement includes several essential components to ensure it is legally sound and practically useful.

First, identification of the parties must include the full legal names, dates of birth, and addresses of both partners, along with the date and address of the common residence. This establishes the context and parties bound by the agreement.

Second, the property regime clause is the cornerstone of the agreement. It specifies whether the parties will maintain complete separation of property (each retains assets acquired in their own name), share assets acquired during the cohabitation, or adopt a mixed approach. This clause should identify pre-existing personal property belonging to each partner and define what constitutes jointly acquired property.

Third, expense sharing provisions define how household and living expenses will be shared during the relationship, including whether a joint bank account will be maintained, how contributions will be made, and which expenses each partner will bear individually.

Fourth, separation clauses establish what happens when the cohabitation ends, including notice periods, rights regarding the family residence (particularly important when one partner is the sole owner or sole tenant), and division of jointly acquired property.

Fifth, spousal support provisions, if agreed upon, specify the amount, duration, and conditions of any support payment from one former partner to the other upon separation, given that no such obligation exists automatically under Quebec law.

Sixth, provisions regarding children, if applicable, address custody arrangements, child support in accordance with the Quebec child support guidelines, and educational and healthcare decision-making, in the best interest of the child as required by article 604 C.c.Q.

Seventh, a dispute resolution clause establishes whether disputes will be resolved through mediation, arbitration, or the courts, with reference to Quebec's family mediation program.

Eighth, a good faith clause under article 1375 C.c.Q. and a governing law clause confirming the application of Quebec law complete the agreement. Both parties should sign in the presence of the other, ideally before a notary, to ensure the agreement's maximum enforceability.