
Family Agreements
A cohabitation agreement in BC sets your terms before living together makes you spouses
For couples moving in together or already sharing a home, often where one partner owns it or you plan to buy. Here is when the law starts treating you as spouses, and what an agreement can change.
The short answer
A cohabitation agreement is a written contract between two people who live together, or are about to, that sets what happens to property, debt and spousal support if they separate. It can be signed before moving in or years later.
BC's Family Law Act treats unmarried partners as spouses once they have lived together in a marriage-like relationship for two years. From then, the Act's rules on dividing property and debt and on spousal support apply to them much as they do to a married couple. For spousal support, partners with a child together can qualify sooner. Nothing is registered: the facts of the relationship decide it.
The agreement can set its own rules for property, debt and spousal support. It can't bind parenting arrangements made before separation or hold child support below the Federal Child Support Guidelines. If the couple later marry, the agreement generally carries on, because the Act treats married and unmarried spouses the same way, though it should say so in its own terms.
updated October 19, 2026
When does living together make us spouses in BC?
Under the Family Law Act, you become spouses after living together in a marriage-like relationship for a continuous period of at least two years. For spousal support, a shorter marriage-like relationship counts if you have a child together. Nothing is registered or filed; if the question is ever disputed, a court decides it from how you actually lived.
Marriage-like is a judgment about the whole relationship, not a checklist. Courts look at a shared home, how money and expenses were handled, whether you presented as a couple, care for each other in illness, and how you described the relationship on tax returns and insurance forms. No single factor decides it, and couples with separate bank accounts can still qualify.
The clock runs from the start of the marriage-like relationship, which can be hard to pin down when dating turned gradually into living together. An agreement can record the date the couple treat as the start, which is useful evidence later.
Unmarried couples came under BC's property division rules when the Family Law Act took effect on 18 March 2013; before that, an unmarried partner generally needed a trust or unjust enrichment claim to share in the other's property.
What happens if we live together and never sign anything?
Before the two-year mark (and without a child together), the Family Law Act's property and support rules don't apply, and each partner generally keeps what is in their own name. Once you are spouses, family property and family debt are shared equally on separation, including growth in a home one partner already owned, and either can claim spousal support.
- Property: before two years, each keeps what is in their own name, subject to ordinary property and trust law; after two years, property either owns at separation is family property shared equally unless excluded.
- A home one partner already owned: before two years, it stays the owner's; after, its starting value is excluded but growth during the relationship is shared.
- Debts: before two years, each answers for debts in their own name; after, debt taken on during the relationship is family debt shared between them, though the lender's rights don't change.
- Spousal support: before two years, generally no claim without a child together; after, either can claim, based on need, ability to pay and the roles each played.
- Inheritance without a will: before two years, no share under the Wills, Estates and Succession Act; after, the survivor inherits as a spouse.
- Limitation period: once spouses separate, the s. 198 clock for property and spousal support claims starts at the date of separation.
What can a cohabitation agreement decide?
A cohabitation agreement can set how property and debt would be divided if you separate, which assets stay with the partner who brought them in, how a shared home is split, and whether either partner pays spousal support. It can't bind parenting arrangements made before separation or hold child support below the Federal Child Support Guidelines.
Typical terms: a schedule of what each partner owns on moving in, with values; how payments toward a home owned by one partner count; how a jointly bought home is divided, including buyout rights; and whether either will claim support. An agreement signed before the two-year mark can cover the time before the Act applies too, so one set of terms governs throughout.
Property terms bind if the agreement is in writing, signed by both partners and witnessed (s. 93); separate lawyers and full disclosure make it much harder to challenge. Terms about future children can be recorded as intentions only, because parenting arrangements agreed before separation don't bind (s. 44).
I'm moving into my partner's home. Do we need a cohabitation agreement?
Usually, yes, because each of you has something to settle. After two years, growth in the home's value during the relationship is shared by default, which matters to the owner. The partner moving in, who may pay toward the mortgage, strata fees or renovations, has no agreed credit for those payments unless an agreement sets one.
For the owner, the question is whether to keep the home's growth out of family property, share part of it, or share it fully. For the partner moving in, it is what their payments are: rent with no claim to equity, a loan, or a contribution that earns a share. Renovations paid by the partner who isn't on title raise the same question.
The agreement should also say how payments are recorded: a running ledger, a fixed monthly amount treated as rent, or a formula for a share of growth. Principal payments are often treated differently from strata fees, taxes and utilities. Keep the records with the agreement.
Should we sign an agreement before buying a home together?
Yes, particularly when the down payments are unequal. Without an agreement, a home bought together during the relationship is generally shared equally once you are spouses, whoever paid more. An agreement can give each partner's down payment back first, and the title should match it: tenants in common in set shares, or joint tenants where survivorship is the intention.
Title is registered at the Land Title Office in one of two forms. Joint tenants own the whole together, and the survivor takes it outside the will. Tenants in common each own a share, which can be unequal and passes under each owner's will. When the title is silent, BC law presumes a tenancy in common.
The agreement and the title should tell the same story. If an agreement returns one partner's larger down payment first but title is a joint tenancy, survivorship may settle ownership on a death whatever the agreement says. Adding a partner to title on a home one of you owns is a transfer, and Property Transfer Tax relief turns on whether that Act treats you as spouses and how the home is used. The guide to buying a home together unmarried covers the purchase.
What happens to our cohabitation agreement if we get married?
Generally it keeps working. The Family Law Act applies the same agreement rules to married and unmarried spouses, so a cohabitation agreement that meets the formalities can continue to govern after the wedding. It is safer for the agreement to say so expressly, and to review it when you marry, in case your finances or plans have changed.
Marriage adds two things an unmarried couple doesn't face: a divorce under the federal Divorce Act if the marriage ends, and a limitation period for property and support claims that runs from the divorce order rather than from separation. The marriage agreements page covers the planning a wedding brings.
Common questions
Is there a way to register as common law in BC?
No. BC has no registry for unmarried couples, and no form makes you spouses under the Family Law Act. The CRA, insurers, employers and immigration authorities may ask for a statutory declaration about your relationship, applying their own tests. Signing one doesn't decide whether you are spouses for property division or support.
Does sharing a lease or splitting bills make us common law?
Not by itself. Roommates share leases and split bills too. The question under the Family Law Act is whether the relationship is marriage-like, and a shared lease is one piece of evidence among many. Once a couple have lived together in a marriage-like relationship for two years, they are spouses whether or not their names are on the same lease.
Can we sign a cohabitation agreement after we've lived together for years?
Yes. Spouses can make an agreement at any point, and many couples sign one after buying a home or receiving an inheritance. An agreement signed after two years together changes rights that already apply, so each partner may be giving something up. Full disclosure and separate legal advice matter even more for that reason.
Does a cohabitation agreement have to be witnessed?
For its property and debt terms to bind under s. 93 of the Family Law Act, yes. The agreement must be in writing and signed by both partners, with the signatures witnessed by at least one other person. Each partner's lawyer usually witnesses their own client's signature when giving advice, which also creates a record that advice was given.
If my partner dies without a will, do I inherit anything?
If you had lived together in a marriage-like relationship for at least two years and hadn't separated, you count as a spouse under the Wills, Estates and Succession Act and inherit as one. How much depends on whether your partner had children, and whether they are also yours. Under two years, you have no share on an intestacy, though other claims against the estate may be possible.
Do we need an agreement if neither of us owns property yet?
Perhaps not yet. What you each acquire while together becomes family property once you are spouses, and an equal split may suit you both. Revisit it when something shifts the balance, such as an expected inheritance, a new business, or one partner putting more toward a first home, and sign before the money moves.

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