Buying a Home With a Friend, Sibling, or Parent: What to Settle First (2026)
Co-buying with a friend, sibling or parent: everyone is jointly liable for the full mortgage. What to settle (title, shares, exit plan) before you buy.
Co-buying is legally simple and personally complicated. The lender treats all buyers as co-borrowers, jointly and severally liable for the full mortgage; combined incomes qualify, so two people earning $80,000 each can buy roughly what one person earning $160,000 can: about $721,000 with 10% down at today's stress test. You choose how to hold title: joint tenancy (equal shares, survivorship) or tenants in common (unequal shares allowed, each share passes by will). And you sign a co-ownership agreement before closing that says what happens when one wants out, stops paying, dies, or marries. The tax rules (first-time buyer rebates, principal residence exemption) apply to each owner separately.
Figures come from the CostToClose affordability calculator.
Qualifying together
| Metric | Alone ($80,000) | Together ($160,000) |
|---|---|---|
| Housing budget at 39% GDS | $2,600/mo | $5,200/mo |
| Less tax and heat (≈ $454 alone, ≈ $721 together) | $2,146 | $4,479 |
| Maximum mortgage at 6.49%, 25 years | ≈ $319,000 | ≈ $669,000 |
| Purchase price at 10% down (with premium) | ≈ $344,000 | ≈ $721,000 |
Produced by the CostToClose calculator, 14 September 2026. Each co-borrower's other debts count against the combined ratios; one car loan can cost $60,000 of purchasing power.
Joint tenancy vs tenants in common
| Metric | Joint tenancy | Tenants in common |
|---|---|---|
| Shares | Equal | Any split (60/40, 50/25/25) |
| On death | Survivor(s) take the deceased's share automatically | Deceased's share passes under their will |
| Typical use | Spouses | Friends, siblings, parent-child with unequal contributions |
| Selling your share | Requires severing to tenancy in common first | Possible, subject to the agreement |
For anyone who is not a spouse, tenants in common with shares matching contributions is the usual advice. Registering the actual percentages matters for capital gains and for the rebates below.
Each owner's tax position is their own
- Land transfer tax rebates (Ontario, Toronto, BC, PEI) are prorated by ownership share and apply only to owners who qualify. A first-time buyer holding 50% with a parent who has owned before gets half the Ontario refund: $2,000.
- FHSA and Home Buyers' Plan are per person; each first-time buyer uses their own.
- Principal residence exemption covers the share of an owner who lives there. A parent who co-owns 25% but lives elsewhere pays capital gains on 25% of the gain at sale (unless documented as a bare trust).
- The federal first-time buyer GST rebate on a new build requires that all purchasers be first-time buyers, with a limited exception; a co-owning parent can void it.
The co-ownership agreement
Non-negotiable, drafted by a lawyer, signed before closing. It should cover:
- Contributions: down payment, closing costs, monthly payment, repairs, improvements, and how unequal contributions change shares.
- Occupancy: who lives there, whether rent is paid to a non-resident owner, guests and partners.
- Exit: notice period, right of first refusal, how the price is set (appraisal), what if the remaining owner cannot qualify alone.
- Default: what happens when one stops paying; step-in rights; forced sale trigger.
- Death and incapacity: consistent with the title choice and each owner's will.
- Dispute resolution: mediation before litigation.
Worked example from the calculator
Two friends, $80,000 each, buying a $700,000 Ottawa townhouse, 10% down, one is a first-time buyer, tenants in common 50/50:
| Item | Amount |
|---|---|
| Combined income needed (calculator) | ≈ $155,000 — they qualify at $160,000 |
| Ontario land transfer tax | $10,475 |
| First-time buyer refund (50% share × $4,000) | −$2,000 |
| Each person's cash to close (down payment $35,000 + half of ≈ $14,000 costs) | ≈ $42,000 |
Frequently asked questions
Can two friends get a mortgage together in Canada?
Yes. Lenders combine incomes and treat each as fully liable for the whole mortgage. Each person's credit and debts are assessed.
What is the difference between joint tenants and tenants in common?
Joint tenants hold equal shares with survivorship; tenants in common can hold unequal shares that pass by will. Non-spouses usually choose tenants in common.
Do we both get the first-time buyer rebate?
Only qualifying owners, and only in proportion to their share of the property.
What if one of us wants to sell?
The co-ownership agreement should say. Typically the other has a right to buy the share at appraised value, failing which the property is sold.
Is a co-ownership agreement legally required?
No, but without one the default rules (partition and sale on application to court) are slow, expensive and blunt.
Sources
- Financial Consumer Agency of Canada, co-borrowers — checked 14 Sept 2026
- Ontario Ministry of Finance, Land Transfer Tax refund — proportional entitlement — checked 14 Sept 2026
- Canada Revenue Agency, principal residence exemption for co-owners — checked 14 Sept 2026
- Department of Finance Canada, First-Time Home Buyers' GST Rebate — co-purchaser rules — checked 14 Sept 2026
This is general information for Canadian home buyers and sellers, checked against the sources listed above on the date shown, and it is not legal, tax, or mortgage advice. Rules and rates change, so confirm current figures with your lawyer or notary, your lender, or the government office that administers the tax before relying on them.