Moving in together is exciting. It can also be financially complicated in ways most couples don't expect: rent or mortgage, renovations, joint purchases, debt, and sometimes one partner supporting the other while they build a career or business.
A cohabitation agreement is the Canadian legal tool that helps unmarried couples put clear, written rules around money and expectations while they share a home. Think of it as planning, not pessimism. It reduces stress now and reduces conflict later if life changes.
This guide covers what a cohabitation agreement typically includes, what it can't do, how it differs across provinces, how to make it more likely to hold up, and practical steps to get started.
What is a cohabitation agreement?
A cohabitation agreement is a written contract between partners who live together (or plan to) but are not married. It usually sets rules for:
- Property and assets: who owns what now, and what happens to property acquired during cohabitation
- Debt: how existing and future debts are handled
- Spousal support: whether support will be paid if you separate, and how it's calculated
- Living expenses: how you share rent, mortgage, utilities, and other costs
In many provinces, a cohabitation agreement can also be converted into a marriage contract if you later marry. If you're comparing it to a prenup, we break down the differences in our prenup vs. cohabitation agreement guide.
Why this matters more than most couples realize
A lot of couples assume that living together automatically creates the same legal rights as marriage. In Canada, that's often not true, and the rules vary widely by province.
A cohabitation agreement can help you:
- Protect what you brought into the relationship (savings, investments, a condo, a family gift)
- Clarify ownership of big purchases like cars, furniture, a shared home, or renovations
- Plan for spousal support risk in a fair, transparent way
- Reduce uncertainty when one partner earns significantly more, or one partner pauses work for caregiving
- Avoid expensive disputes and the classic "we said we would" disagreements later on
It's especially useful when one partner owns a business, when there's significant debt on either side, when you're buying property together (or one partner is moving into the other's home), when you expect an inheritance, or when it's a second relationship with children or complex obligations.
Cohabitation agreement vs. prenup: the simple version
Most Canadians use a cohabitation agreement when they're not married but living together, and a prenuptial agreement when they're planning to marry. The topics overlap heavily: property, debts, and spousal support.
A helpful rule of thumb: if you're moving in next month, start with a cohabitation agreement. If you're getting married next year, you might start with a cohabitation agreement now and update or convert it when wedding plans are firm. We cover this in more detail in our prenup vs. cohabitation agreement breakdown.
What a cohabitation agreement can include (practical clauses that actually help)
A strong cohabitation agreement is specific. Vague promises are where couples get burned.
Property you each already own
This is sometimes called excluded property or separate property (the language varies). The agreement typically lists bank accounts, savings, investments, registered accounts like RRSPs and TFSAs, real estate owned before moving in, vehicles, business interests, and valuable personal property.
Why does this matter? If you later separate, disputes often start with "we both contributed, so we both own it." Clear schedules and definitions reduce that risk considerably.
Property you acquire during cohabitation
Couples typically choose one of a few approaches: keep property separate unless it's jointly titled, share specific categories (like household items purchased together), or define a formula for shared purchases such as contributions to a down payment.
If you're buying property together, you can also address title structure (joint tenants vs. tenants in common), down payment contributions, mortgage payments, renovation costs, and what happens if one person wants to sell and the other doesn't.
How you handle living expenses
Many couples find it helpful to spell out the rent or mortgage split (50/50, proportional to income, or something else), how you handle utilities, groceries, subscriptions, repairs, and whether a joint account is used.
This section is not romantic, but it prevents the kind of recurring arguments that quietly eat away at a relationship.
Debts (existing and future)
A cohabitation agreement can set expectations around student loans, lines of credit, credit cards, business debt, and tax debt. The most common approach: each partner keeps their own pre-existing debts, and joint debts are only those in both names or explicitly agreed to in writing.
Spousal support
Depending on the province and your circumstances, unmarried partners can face spousal support claims after separation. A cohabitation agreement may confirm whether support will be paid, set a support amount or formula, limit duration, or include review triggers (for example, if you have a child, a disability, or a major income change).
One caution here: courts tend to scrutinize spousal support waivers more closely, especially if the outcome is harsh or if there was poor disclosure or pressure during signing.
What happens if you separate
This can cover who stays in the home temporarily, the timeline for moving out, how joint property is divided, the buyout process for shared real estate, and how joint accounts are closed.
Dispute resolution (often overlooked)
It's worth adding a commitment to try mediation before going to court, a process for exchanging financial information, and a timeline for responding to offers.
Updating the agreement
Life changes. Good agreements plan for it. Consider annual or biennial reviews, with mandatory reviews triggered by engagement, marriage, pregnancy, or buying property.
What a cohabitation agreement usually can't do
Even well-drafted agreements have limits.
You generally can't pre-decide custody or parenting arrangements in a way that overrides a child's best interests at separation. You can't contract out of child support obligations. And clauses that are extremely unfair, or that were signed without proper disclosure or under pressure, may not hold up.
Because enforceability depends on provincial law and facts, it's important to discuss your plan with a qualified family lawyer. We cover common enforceability mistakes in detail on the blog.
Province-by-province overview
Canadian family law is a mix of federal and provincial rules. Your province can change what "common-law" means, when spousal support is possible, and how property is treated.
Ontario
In Ontario, couples often use cohabitation agreements as the unmarried version of a marriage contract. The key practical point is that property division rules for married spouses do not automatically apply to unmarried spouses in the same way. That makes a cohabitation agreement particularly valuable for clarifying property ownership and expectations.
British Columbia
BC's family law framework can treat many unmarried couples as "spouses" after meeting certain criteria, which affects property division and support. In other words, moving in together in BC can create serious legal consequences sooner than many couples expect, especially when you add real estate or a business.
Alberta
Alberta has the concept of adult interdependent partners (AIPs), and the legal effects can depend on factors like how long you've lived together and whether you share a child. A cohabitation agreement can help partners define how they want to handle property, debt, and support expectations, particularly when one person owns assets going in.
Quebec
Quebec operates under a distinct legal system (civil law), and the treatment of unmarried partners differs significantly from other provinces. Because the baseline rights and remedies can be very different, it's especially important in Quebec to speak with a Quebec family lawyer about what a cohabitation agreement can realistically accomplish.
For a fuller provincial comparison, see our prenup laws by province guide.
How to make your agreement more likely to be enforceable
No document is guaranteed bulletproof, but there are steps that genuinely improve your odds.
Full and honest financial disclosure
Most enforceability problems start with incomplete disclosure. Prepare a clear snapshot of assets (including pensions, businesses, crypto, and real estate), debts, and income. If you have complex assets, consider professional valuations.
Independent Legal Advice (ILA) for both partners
This is one of the biggest factors that helps agreements hold up in Canada. Each partner should have their own family lawyer. Lawyers confirm they explained rights, risks, and alternatives. The agreement gets signed properly and stored safely.
Avoid pressure and last-minute signing
Agreements signed under time pressure can be challenged later. Start the conversation early, share drafts well before move-in or major financial steps, and leave time for negotiation and lawyer review. We have a practical prenup timeline and checklist that works well for cohabitation agreements too.
Keep the terms fair and realistic
Courts may be skeptical if the agreement creates a very harsh result, especially around spousal support. Fair doesn't always mean equal. It means the agreement makes sense given income differences, career sacrifices, health issues, contributions to the household, and the length of the relationship.
Update when your life changes
An agreement drafted when you were renting a one-bedroom may not fit after you buy a home, start a business, receive an inheritance, or have a child. Update rather than hoping an old agreement covers new realities.
How to bring it up without causing a fight
Many couples avoid this conversation because it feels awkward. A simple mindset shift helps: this is about clarity, not suspicion.
Try something like:
- "I want us to be on the same page about money before we move in."
- "I want to protect both of us from misunderstandings if life changes."
- "I'd rather agree on fair rules now than argue later when emotions are high."
A few practical tips: pick a calm time (not during another conflict), use "we" language and focus on shared goals, share your reasons plainly, and invite your partner to suggest terms that protect them too. We go deeper on the conversation side in our guide to talking about a prenup without starting a fight, which applies equally to cohabitation agreements.
Real-life scenarios
One partner owns the home. One partner owns a condo and the other is moving in. A cohabitation agreement can clarify whether the non-owner pays rent or contributes to the mortgage, whether contributions create any ownership interest, and how renovation costs are handled.
You're buying a home together with different contributions. If one partner pays most of the down payment, you can set ownership shares, a buyout formula, and what happens if you split within one, three, or five years.
One partner is an entrepreneur. Business owners often want clarity that the business (and growth in value) remains theirs, or is shared only in defined ways, and that business debt isn't treated as a joint problem unless agreed.
One partner expects an inheritance. A cohabitation agreement can clarify treatment of gifts from family, inheritances, and family trusts.
How much does a cohabitation agreement cost?
Costs vary by province, complexity, and how much negotiation is involved.
Typical cost drivers include whether you own real estate or a business, whether spousal support is addressed or waived, complexity of assets (investments, pensions, private companies, crypto), and how aligned you already are on terms.
Most couples should budget for drafting and revisions, two sets of Independent Legal Advice (ILA), and potential valuations if needed. For a realistic sense of pricing, our prenup cost guide is a helpful benchmark since the process is similar.
Step by step: how to get a cohabitation agreement
1. List your goals. What are you trying to protect or clarify? A home, a business, debt, savings?
2. Gather your financial details. Assets, debts, income, and any supporting documents.
3. Discuss high-level terms with your partner. Property approach, expense sharing, spousal support approach.
4. Create a first draft. Some couples start with a template to organize their decisions before legal review.
5. Each partner gets Independent Legal Advice (ILA). Adjust the agreement based on feedback from your respective lawyers.
6. Sign properly and store securely. Keep copies, and set a date to review the agreement down the road.
FAQ
Do common-law partners need a cohabitation agreement? Not everyone needs one, but many couples benefit from one, especially when there's real estate, major income differences, a business, significant debt, or family money involved. The biggest reason couples sign one is to avoid uncertainty, because common-law rules differ by province.
Can a cohabitation agreement cover spousal support? Often, yes. Many agreements include spousal support terms, including limits or waivers. Whether a term holds up depends on factors like fairness, disclosure, and whether both partners received Independent Legal Advice.
What happens if we sign one and later get married? In many cases, couples update or convert it into a marriage contract or prenup when wedding plans are firm. It's smart to review it before marriage because legal rules and goals can shift.
Is a cohabitation agreement enforceable without lawyers? A document can still be a contract, but enforceability risk is much higher without Independent Legal Advice, proper disclosure, and careful drafting. If you want the agreement to carry real weight, ILA is strongly recommended.
Can we use a template? A template can be useful for organizing decisions and creating a first draft, but it's not a substitute for province-specific legal advice. If you use one, focus on clarity, disclosure, and terms that match Canadian law.
A practical next step
If you're moving in together, a cohabitation agreement is one of the simplest ways to protect both partners and keep the focus on your relationship instead of financial uncertainty.
If you want a structured way to think through the key questions before meeting with lawyers, Prenuply can help you generate a customized agreement template based on your situation.
This article provides general information about cohabitation agreements in Canada. It is not legal advice. Prenuply AI Inc. is not a law firm and does not provide legal services. Prenuply is a technology company, not a legal services provider. For advice about your specific situation, consult a qualified family lawyer in your province. Independent Legal Advice (ILA) is essential for enforceable agreements in Canada.