Buying With Someone Else

Two incomes buy more house than one, and more complications. When you purchase with a partner, sibling, or friend, the lender qualifies you on the combined file, the land transfer tax bill does not care how you split the down payment, and the legal structure of your shared ownership decides what happens if one of you wants out.

This calculator merges two buyers into one picture: pooled down payment, pooled income, pooled debts, and the resulting borrowing power and closing costs. The question it answers: together, what can we afford, and what does each of us owe on closing day?

It does not draft your co-ownership agreement, model a breakup or buyout, or decide who gets the house. It treats your combined finances the way a lender does; the legal relationship between you needs a lawyer.

Your inputs, explained

Each buyer's income and debts. Enter gross income and monthly debt payments per person. The lender combines incomes for GDS and all debts for TDS, so one partner's car loan drags the joint ratios as if it were shared. The common error is entering only the higher earner's debts; lenders count both files in full.

Each buyer's down payment contribution. Who brings what. It matters less for qualifying, because the lender sees the total, but it matters enormously for your private agreement about ownership shares.

Ownership split. Fifty-fifty is the default, but unequal down payments often mean unequal shares. Enter the agreed percentage. If you have not agreed on one, have that conversation before signing anything.

First-time buyer status per person. Ontario's refund up to $4,000, Toronto's additional municipal refund up to $4,475, BC's exemptions, and PEI's exemption each define first-time as never having owned anywhere in the world. If one of you owned before, the relief shrinks; the calculator applies it only when both buyers qualify.

HBP and FHSA per person. Each person can withdraw up to $60,000 under the Home Buyers' Plan, and each can hold their own FHSA ($8,000 per year, $40,000 lifetime). Enter amounts separately; the limits are per person, not per household.

How the math works

The calculator adds both incomes into one gross household figure and both debt loads into one monthly obligation. Then the standard qualifying math: housing costs (mortgage payment plus property tax plus heat plus half of condo fees) against 39% of combined income for GDS, and housing plus all debts against 44% for TDS on insured files.

Closing costs are computed once on the full price, because land transfer tax, legal fees, and title insurance do not split by buyer. The calculator then divides the closing-day cash by your ownership split so each person sees their own cheque.

A compliance check on down payment sources: gifts from immediate family need a signed gift letter, and insurers want proof of closing costs of at least 1.5% of the price on top of the down payment. Borrowed money is accepted by some lenders for the portion above 5%, with the payment counted in debt ratios.

Worked example

A couple in Toronto buys an $800,000 resale condo. Combined gross income: $210,000. Combined debts: $700 per month. Down payment: $180,000 total (she brings $120,000, he brings $60,000), which is 22.5%, so no mortgage insurance. Ownership split: 60/40. Both are first-time buyers under the never-owned test.

Step 1: Mortgage. $800,000 − $180,000 = $620,000.

Step 2: Payment at 4.50%, 25-year amortization: ≈ $3,446 per month.

Step 3: Housing cost. $3,446 + property tax $330 + heat $120 + half of condo fees ($600 × 50% = $300) = $4,196.

Step 4: GDS. $4,196 × 12 ÷ $210,000 = 24.0%. Under 39%: passes.

Step 5: TDS. ($4,196 + $700) × 12 ÷ $210,000 = 28.0%. Under 44%: passes.

Step 6: Land transfer tax. Ontario provincial on $800,000: $275 + $1,950 + $2,250 + (2% × $400,000 = $8,000) = $12,475. Toronto municipal: an identical $12,475. Combined: $24,950.

Step 7: First-time relief. Ontario refund up to $4,000 + Toronto municipal refund up to $4,475 = $8,475. Net tax: $24,950 − $8,475 = $16,475.

Step 8: Cash per person at 60/40. Her share of the tax: $9,885. His: $6,590, before legal fees and other closing costs, which split the same way.

Provincial quirks and edge cases

In Quebec, co-ownership runs under civil law rather than common law, and the available ownership structures differ from the rest of Canada. The specific forms of shared title are [VERIFY]; have a notary set the structure before you sign.

Ontario's 25% Non-Resident Speculation Tax applies on the full price if one co-buyer is a non-resident, even if the other is Canadian. Inside Toronto, the 10% municipal tax stacks on top. Narrow exemptions exist, such as a Canadian spouse co-purchaser occupying as a principal residence; confirm with a lawyer.

BC's transfer tax exemptions test eligibility per buyer, so mixed first-time status gets complicated. PEI's first-time exemption requires six months' PEI residency or PEI tax filer status in two of the last six years, tested per buyer.

Everywhere, land transfer tax is cash on closing day and cannot be added to the mortgage. With two buyers, both people's cash must actually be available that day; one side's shortfall delays the whole closing.

Questions to ask a professional

1. Ask your lawyer: joint tenants or tenants in common, and what happens to each share if one of us dies?
2. Ask your lawyer: can you draft a co-ownership agreement covering buyouts, sale triggers, and who pays what if one of us stops contributing?
3. Ask your mortgage broker: are we jointly and severally liable, meaning the lender can pursue either of us for the full payment?
4. Ask a tax professional: if we are not spouses, does an unequal split create attribution or capital gains issues?