Real Estate Law Wizard

Co-Ownership Agreements: Joint Tenancy vs Tenancy in Common

Buying property with partners, friends, or family? Plan the title structure — joint tenancy vs tenancy in common — and the agreement terms that prevent co-owner disputes.

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Joint Tenancy vs Tenancy in Common: The Choice That Decides Inheritance

How title is registered determines what happens when a co-owner dies. Joint tenancy carries the right of survivorship: the deceased's interest passes automatically to the surviving co-owner(s), outside the will and outside probate — which is why spouses commonly choose it. Tenancy in common gives each owner a distinct, transferable share (equal or unequal — 70/30 works fine) that forms part of their estate and passes to their chosen beneficiaries. Friends, siblings, and investment partners almost always intend tenancy in common; joint tenancy between non-spouses is a recurring source of estate litigation when one dies and the family discovers the co-owner inherited everything. Quebec's civil law achieves the tenancy-in-common result through undivided co-ownership (indivision).

These rules apply across Canada and the United States with local variations — some US states add tenancy by the entirety for married couples and community property regimes in states like California and Texas. The registered title should be a deliberate instruction to your closing lawyer, never a default; and an existing joint tenancy can be severed (sometimes unilaterally) if it no longer matches intent.

What a Co-Ownership Agreement Actually Covers

A co-ownership agreement is a contract among the owners that pre-solves the predictable disputes. Core terms: ownership shares and whether contributions of money or labour adjust them over time; how the mortgage, taxes, insurance, and repairs are split, and the operating account they flow through; decision rules (what requires unanimity — selling, mortgaging, major renovations — versus majority); occupancy terms where some owners live in and others don't, including whether occupying owners pay rent to the ownership; and record-keeping so the accounting on eventual sale is arithmetic rather than archaeology.

The heart of the document is the exit machinery. Triggering events — a co-owner wanting out, death, disability, divorce, bankruptcy, or payment default — each map to a mechanism: rights of first refusal, appraisal-based buyouts (with the valuation method fixed in advance), shotgun clauses for deadlock, and forced-sale provisions as the backstop. Payment default clauses matter most in practice: on a joint mortgage each borrower is typically liable for the whole payment, so the agreement should convert a co-owner's missed payments into share adjustments, an interest-bearing loan, or a buyout trigger after a cure period.

Unequal Money, Family Money, and What Happens Without an Agreement

Unequal contributions are where informal co-ownership goes wrong. If one buyer funds 70% of the down payment but title reads 50/50, the law's frequent starting point is that title governs — unwinding it means litigating resulting trust or unjust enrichment years later, from memory, against a former friend. The fixes are simple at purchase: register tenancy-in-common shares that match the money, or fix the accounting in the agreement. Family money needs its own characterization — gift (lenders typically want a signed gift letter), documented loan (a promissory note or registered mortgage, or it may be unrecoverable and fought over in the estate), or genuine co-ownership with its tax and creditor-exposure consequences for the parent.

Without any agreement, co-owner disputes default to the bluntest instrument in property law: the partition action. Every province and state gives a co-owner the right to apply to court for partition or sale, and courts rarely refuse — meaning any co-owner can ultimately force the property onto the market on litigation timelines and litigation budgets. A co-ownership agreement doesn't eliminate that right; it makes it unnecessary, replacing a lawsuit with a valuation formula and a timeline. Drafted alongside the purchase, with independent legal advice for each owner, it typically costs a small fraction of a single contested partition application.

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Frequently Asked Questions

What is the difference between joint tenancy and tenancy in common?
Joint tenancy includes a right of survivorship — when one owner dies, their interest passes automatically to the surviving owner(s), bypassing the will. Tenancy in common gives each owner a defined share (equal or unequal) that passes through their estate to their beneficiaries. Couples often choose joint tenancy; friends, siblings, and investors almost always want tenancy in common with shares matching their contributions.
Do I really need a co-ownership agreement to buy with a friend?
Yes, in practice. Without one, your arrangement runs on default law: title percentages govern regardless of who paid what, any co-owner can force a court-ordered sale through a partition action, and a co-owner's death or payment default has no agreed playbook. The agreement pre-solves shares, expenses, exits, defaults, and death for a small fraction of what one partition lawsuit costs.
We're putting in different down payments. How do we protect that?
Two tools, often used together: register title as tenants in common in shares matching the money (e.g., 70/30), and/or record the contributions in a co-ownership agreement that fixes how sale proceeds are divided — including whether ongoing mortgage payments and renovations adjust the shares. Doing neither invites the presumption that title (often 50/50) is the deal, which is expensive to rebut later.
What happens if my co-owner stops paying the mortgage?
The lender can pursue any borrower for the full payment — joint mortgage liability is typically 'joint and several' — and missed payments damage every borrower's credit. A good co-ownership agreement converts a default into consequences: the paying owner's coverage becomes an interest-bearing loan or adjusts equity shares, and persistent default triggers a buyout right. Without an agreement, your main remedy is a partition lawsuit to force a sale.
Can one co-owner force the sale of the property?
Ultimately yes. Every Canadian province and US state provides a partition (or partition and sale) procedure letting a co-owner ask the court to divide or sell co-owned property, and courts grant it in all but exceptional cases. It is slow and adversarial — which is exactly why co-ownership agreements build in buyout and first-refusal mechanisms, so exits happen by formula instead of by lawsuit.
A parent is helping with our down payment. Should it be a gift or a loan?
Decide explicitly and paper it. A gift usually requires a signed gift letter for the lender and generally can't be reclaimed later. A loan should be documented — promissory note, repayment terms, ideally a registered mortgage — or it risks being unenforceable and disputed within the family or the estate. Putting the parent on title is a third structure with real consequences: potential capital gains on their share, exposure to their creditors, and effects on first-time-buyer benefits.

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This planner provides general legal information about co-owning real estate in Canada and the United States. It is not legal advice; title structures, partition rights, family property law, and tax consequences vary by province and state. Each co-owner should get independent legal advice before signing a co-ownership agreement or taking title.

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