With home prices in Canada making it increasingly difficult for single buyers to enter the market, co-ownership — buying a home with a friend, sibling, parent, or partner — is becoming more common. Here is what you need to know about the legal structures, mortgage qualification, and potential pitfalls.
Legal structures for co-ownership
The way you hold title determines your rights and what happens to the property if a co-owner dies, wants to sell, or faces legal trouble.
| Structure | Ownership Split | Right of Survivorship | Can Will Your Share | Best For |
|---|---|---|---|---|
| Joint tenancy | Equal shares only | Yes — share passes to survivor(s) | No | Married/common-law couples |
| Tenancy in common | Any split (50/50, 60/40, etc.) | No — share goes to your estate | Yes | Friends, siblings, investors |
Joint tenancy
- All owners hold equal shares (if two owners, each has 50%)
- Right of survivorship means the last surviving owner ends up with 100%
- All four “unities” must be present: time, title, interest, and possession
- One owner can sever the joint tenancy unilaterally by transferring their interest — this converts to tenancy in common
Tenancy in common
- Owners can hold unequal shares that reflect their financial contributions
- Each owner can sell, mortgage, or will their share independently
- No right of survivorship — your share goes to your estate on death
- Better for co-owners who want proportional ownership based on contributions
For friends or family buying together, tenancy in common is almost always the right choice because it allows unequal shares and gives each owner control over their portion.
Mortgage qualification for co-owners
Lenders assess co-ownership mortgage applications by looking at the combined financial picture:
| Factor | How Lenders Evaluate |
|---|---|
| Income | Combined gross income of all applicants |
| Debts | Combined debt obligations of all applicants |
| Credit scores | Credit score of each applicant reviewed — weakest score may set the rate |
| Down payment | Combined contributions toward down payment |
| Stress test | Applied to total mortgage based on combined GDS/TDS ratios |
| GDS ratio | Total housing costs ÷ combined gross income (max ~39%) |
| TDS ratio | Total housing + all debt payments ÷ combined gross income (max ~44%) |
Key qualification points
- Joint and several liability — All co-owners on the mortgage are individually responsible for the full amount. If one person stops paying, the lender can pursue any or all of the others for 100% of the remaining balance
- Weakest link matters — One co-owner with poor credit or high debts can reduce the amount you qualify for or increase your rate
- Maximum borrowers — Most lenders allow up to 4 borrowers on a single mortgage application. Some limit it to 2
- First-time buyer status — Each co-owner’s first-time buyer status is assessed independently for programs like the FHSA or Home Buyers’ Plan
The co-ownership agreement
A co-ownership agreement is the single most important document in any co-ownership arrangement. Without one, disputes can destroy relationships and result in costly litigation.
What the agreement should cover
| Topic | What to Define |
|---|---|
| Ownership percentages | How much of the property each person owns (should reflect financial contribution) |
| Financial contributions | Who pays the down payment, mortgage, property taxes, insurance, maintenance, and repairs — and in what proportions |
| Decision-making | Who decides on renovations, repairs, refinancing, and other major expenses. Require unanimous consent or majority |
| Expense accounts | Whether to maintain a joint account for shared expenses with monthly contributions |
| Right of first refusal | If one owner wants to sell, the other owner(s) get the first opportunity to buy their share at fair market value |
| Buyout terms | How is the buyout price determined? Independent appraisal? Average of two appraisals? |
| Sale triggers | Events that trigger a mandatory sale or buyout: death, bankruptcy, marriage/relationship change, job relocation |
| Dispute resolution | Mediation before litigation. Define the process and who pays the cost |
| Insurance | Life insurance on co-owners to fund buyouts in case of death |
| Default provisions | What happens if one co-owner stops paying their share of expenses |
| Exit timeline | How much notice is required before a co-owner can exit, and the timeline for selling or buying out |
Cost of a co-ownership agreement
A lawyer-drafted co-ownership agreement typically costs $1,500 to $3,500 depending on complexity. This is not optional — it is essential insurance against disputes that could cost tens of thousands of dollars.
Financial planning for co-owners
Splitting the down payment
If contribution amounts differ, ownership percentages in a tenancy in common should reflect those contributions:
| Co-Owner | Down Payment | Mortgage Share | Ownership |
|---|---|---|---|
| Person A | $80,000 (80%) | 50% of monthly payments | 65% |
| Person B | $20,000 (20%) | 50% of monthly payments | 35% |
The exact split is up to you, but it should be documented in your co-ownership agreement and registered on the title.
Monthly expense management
Best practices for managing shared costs:
- Open a joint account — Each co-owner contributes their share monthly. Mortgage, taxes, and insurance are paid from this account
- Automate everything — Set up automatic transfers and payments to avoid missed due dates
- Build a reserve fund — Contribute to a shared maintenance fund (e.g., $200/month each) for repairs and unexpected expenses
- Track everything — Keep records of all contributions and expenses in case of a future dispute
Tax implications
Principal residence exemption
- Each co-owner who lives in the property can designate it as their principal residence
- The exemption applies proportionally — if you own 60%, the exemption covers 60% of the capital gain
- A co-owner who does not live in the property cannot claim the principal residence exemption on their share
Capital gains on sale
When the property is sold, each co-owner reports their share of the gain:
- Capital gain = (Sale price × ownership %) − (Purchase price × ownership %) − share of eligible expenses
- 50% of the capital gain is taxable income (for gains up to $250,000 in 2026)
- The principal residence exemption can eliminate the tax for co-owners who lived there
Land transfer tax
- Co-owners pay land transfer tax based on the full purchase price at time of purchase
- First-time home buyer rebates (where available) apply individually — if one co-owner qualifies and the other does not, only the qualifying owner’s share of the rebate is available
Exit strategies
Buyout by remaining co-owner(s)
The most common exit method. The remaining co-owner(s) buy out the departing owner’s share:
- Get an independent appraisal (or two, and average them)
- Calculate the departing owner’s equity: (appraised value × ownership %) − remaining mortgage share
- Remaining co-owner(s) refinance the mortgage in their name only
- Pay the departing co-owner their equity
- Transfer the title to remove the departing co-owner
Key issue: The remaining co-owner(s) must qualify for the full mortgage on their own. If they cannot, the buyout may not be possible and the property may need to be sold.
Sale of the property
If neither party wants to buy the other out, the property is sold and proceeds are split according to ownership percentages after paying off the mortgage, closing costs, and any outstanding shared expenses.
Right of first refusal
If one co-owner wants to sell their share, the other co-owner(s) should have the right to buy it first at fair market value. This prevents a stranger from becoming your new co-owner. Define this clearly in the co-ownership agreement.
Risks and how to mitigate them
| Risk | Mitigation |
|---|---|
| One co-owner stops paying | Co-ownership agreement with default provisions, reserve fund |
| Relationship breakdown | Right of first refusal, mandatory buyout/sale triggers |
| One owner wants to sell, other does not | Buyout clauses, timeline for resolution, mediation clause |
| Death of a co-owner | Life insurance on each co-owner, clear provisions in agreement and will |
| Credit damage | Joint and several liability means missed payments affect everyone’s credit. Automate payments |
| Disagreement on maintenance or renovations | Decision-making framework in the agreement with spending thresholds |
| One co-owner’s creditor puts a lien on the property | Limited options — this is a risk of co-ownership. Legal advice essential |
Co-ownership vs other alternatives
| Option | How It Works | Pros | Cons |
|---|---|---|---|
| Co-ownership | Buy together, own together | Pool resources, share costs | Joint liability, exit complexity |
| Gifted down payment | Parent gifts down payment, buyer owns alone | No shared liability | Parent has no ownership stake |
| Co-signer / guarantor | Parent guarantees the mortgage | Buyer qualifies for more | Guarantor liability, no ownership |
| Shared equity programs | Government shares equity (e.g., formerly FTHBI) | Lower payments | Must repay equity share, limited availability |
| Rent and invest | Skip homeownership, invest the difference | Flexibility, diversification | No home equity, rising rents |
The bottom line
Co-ownership can make homeownership accessible when buying alone is not financially feasible. The key to success is treating it as a business arrangement: get a comprehensive co-ownership agreement, choose the right legal structure (tenancy in common for most non-spousal co-owners), maintain clear financial records, and plan for every possible exit scenario before you buy.