Co-Buying with Family or Friends

Co-buying with a sibling, a parent or a friend works, and thousands of Ontario households do it. The part people underestimate is not the down payment. It is the mortgage. Lenders make co-borrowers jointly and severally liable, which means each of you is on the hook for the entire loan, not for your half of it. Sort out the co-ownership agreement and the exit formula before you write an offer, not after.

If you are already talking about this with someone, the cheapest hour you will ever spend is the one where you map out the exit before you shop. Book a call and we will walk you through it.

What you are actually buying is a share, not a suite

Two people buying one condo do not each own a bedroom. You own an undivided interest in the whole thing, which is a fancy way of saying every decision about the property needs both signatures. Repaint the kitchen, refinance, rent out the second bedroom, sell: all of it is a joint decision unless your agreement says otherwise.

That share also carries an illiquidity premium, which is the extra return investors expect for owning something they cannot sell quickly. Real estate is already illiquid. A half interest in a condo that your co-owner does not want to sell is worse than illiquid, it is close to unsellable on the open market. Nobody is bidding on your 50% of a two-bedroom on Lake Shore. The only realistic buyer is the person you bought it with, which is exactly why the buyout mechanism matters more than anything else in this article.

The mortgage: joint and several liability, and what it does to your future

When two people sign a mortgage together, the lender does not divide the debt. If your co-owner stops paying, the bank comes to you for the full monthly payment, and your credit report carries the full balance either way. That last point catches people. When you later apply for a car loan or your own place, most lenders count the entire mortgage payment against your debt service ratios, not half of it. You have effectively spent a chunk of your future borrowing capacity to buy a share of one property today.

Both of you also have to clear the qualifying rate. As of the last OSFI confirmation on January 29, 2026, the minimum qualifying rate for insured and uninsured mortgages is still the greater of your contract rate plus two percentage points or 5.25%. Two incomes make that easier to clear. Two sets of existing debts make it harder. Run the numbers with a broker on both of you together before you fall in love with a listing.

How you hold title decides what happens if someone dies

Two options in Ontario. Joint tenancy means the survivor automatically takes the whole property, which is what most couples choose. Tenants in common means each person owns a stated share and that share passes through their will, which is what most siblings, parents and friends should choose, because it lets your share go to the people you actually intend it to go to. Unequal contributions are also much easier to reflect as tenants in common: one of you can hold 60% and the other 40%. We wrote a full breakdown of the two if you want the detail.

The land transfer tax math, and the rebate trap

Toronto buyers pay land transfer tax twice, once to Ontario and once to the City. Here is a $700,000 purchase, run at the published bracket rates in force as of August 2026.

Ontario and City of Toronto bracket rates and first-time buyer rebate maximums as published, checked August 30, 2026. Figures are illustrative. Your lawyer computes the real number on closing.

The $4,237.50 gap in that right-hand column is the trap. If you buy with someone who is not your spouse and who has owned a home before, you can only claim the rebate in proportion to your own interest in the property. Half the ownership, half the rebate. It is not a reason to avoid co-buying, but it is a real closing cost that should be in the spreadsheet from day one, and it is one argument for structuring the shares deliberately rather than defaulting to 50/50.

Two other numbers worth knowing. On a $700,000 purchase the minimum down payment is $45,000, which is 5% of the first $500,000 plus 10% of the rest. Anything under 20% down means mortgage default insurance, and that premium gets added to your loan balance rather than paid at closing.

Related reading before you sign anything:

• Joint Tenancy vs Tenants in Common: How Ontario Co-Owners Hold Title
• The Bank of Mom and Dad: How Gifted Down Payments Actually Work
• The Mortgage Stress Test in 2026: What It Is and What It Costs You

Four documents to have before you offer

None of this is expensive relative to the purchase. A real estate lawyer drafting a co-ownership agreement costs a fraction of one month of carrying costs, and it is the document that makes the difference between a disagreement and a lawsuit.

The exit is the whole game

Every co-ownership ends. Someone gets a job in Calgary, someone gets married, someone wants their capital back. The agreement should already know what happens. The mechanism we like is straightforward: either party can trigger a buyout, the price is set by an independent appraisal or by averaging two appraisals, and the other party has a fixed window, usually 90 or 120 days, to either buy at that number or agree to list the property. Writing that down converts an argument about fairness into a process with dates on it.

In finance terms you are buying optionality, meaning the right but not the obligation to act. The person who can fund a buyout holds most of it. If your incomes are very different, say so out loud now and build in a longer funding window for whoever has less liquidity.

The argument against doing it

Co-buying is worth it when it gets you into an asset you would otherwise be locked out of for years. It is worth much less when you would qualify on your own within eighteen to twenty-four months, because the transaction costs land twice. You pay land transfer tax to get in, and then a buyout is usually another transfer with its own tax and legal bill to get out. Two round trips inside three years can quietly eat any appreciation you were hoping to capture.

There is also a tax wrinkle worth raising with an accountant. The principal residence exemption, which shelters the gain on the home you live in, only shelters your share and only for the years it was actually your principal residence. A parent who co-signs and holds title but lives elsewhere may be exposed to capital gains on their portion when it sells.

Market conditions cut both ways right now. TRREB reported a GTA condo apartment average of $636,323 in July 2026, down 2.3% year over year, with the apartment benchmark at $535,200, down 7.35%. Borrowing is an amplifier, not a blessing: it multiplies whatever the underlying return happens to be, and in a market that has been drifting down, it multiplies the drift too. Two owners share that, which is the point, but sharing a loss does not make it a gain. The Bank of Canada has held its policy rate at 2.25% through six consecutive decisions with the next one on September 2, 2026, and a genuine easing cycle from here is the thing most likely to change how this math reads a year out.

None of the above is legal, tax or financial advice, and we are not lawyers or accountants. Get the agreement drafted by a real estate lawyer and the tax treatment confirmed by an accountant before you commit.

Send us the two incomes, the two down payments and the neighbourhoods you are considering, and we will model what you can actually buy together, what the closing costs land at including the rebate proration, and what the buyout would cost in three years. If the numbers say wait, we will tell you that. Book a call.

Dave Dubbin
Real Estate Expert
Dave Dubbin & Associates
Real Estate Broker for Etobicoke and Toronto
Sotheby's International Realty, Canada