None of which makes a joint mortgage a bad idea. It is often the only way a family reaches the home it wants, and plenty of families carry one without difficulty for decades. It just needs to be entered into with clear eyes.
The short version
- Every borrower on a mortgage is liable for the whole debt, not for a share of it.
- A missed payment appears on the credit record of every borrower.
- Minimum down payment on an insured purchase is 5 per cent of the first $500,000 and 10 per cent of the portion between $500,000 and $1.5 million.
- Insured financing is not available above a $1.5 million purchase price, a cap in force since 15 December 2024.
- Lenders reassess close to completion, so a pre-sale purchase is judged on your finances then, not at signing.
What a lender is actually assessing
A lender looks at the combined income of everyone applying, the debts everyone carries, everyone's credit history, and the property itself. Adding a second household usually helps on income and can hurt on debt, because the other household's car loan and credit cards come into the calculation too.
The part families do not expect is that the weakest credit record in the group tends to set the tone. A strong applicant does not average out a weak one in the way people assume. If one person's record has a problem, deal with it before applying rather than hoping the other incomes carry the file.
Age can matter as well, because lenders consider the amortisation period against the borrowers' circumstances. A parent in their seventies joining a mortgage may find the available term shorter than expected, which raises the monthly payment. Ask the question early rather than building a plan around an assumption.
The rules that set your minimum down payment
Federal mortgage rules set the floor. On an insured purchase the minimum down payment is 5 per cent of the first $500,000 of the price and 10 per cent of the portion between $500,000 and $1.5 million, and insured financing is not available at all above $1.5 million. Those rules came into force on 15 December 2024.
Below 20 per cent down, the mortgage must be insured and a premium applies, which is normally added to the loan rather than paid in cash. At or above 20 per cent down, no insurance is required and the premium disappears.
For a family pooling money this is one of the few places where combining genuinely helps in a simple way. Two households that can reach 20 per cent together avoid a premium that neither could avoid alone.
| Purchase price | Minimum down payment |
|---|---|
| $500,000 or less | 5% of the price |
| $500,000 to $1,500,000 | 5% of the first $500,000, plus 10% of the rest |
| Above $1,500,000 | Insured financing is not available |
Source: Department of Finance Canada, mortgage reforms in force 15 December 2024, accessed 29 August 2026.
Liability, in the words nobody uses at the kitchen table
If your household pays its half every month and the other household stops paying, the lender does not treat your half as satisfied. The loan is in arrears, both credit records show it, and the lender can pursue either household for the full outstanding amount.
This is not a warning about relatives being untrustworthy. It is about job losses, illness, separation and the ordinary things that happen to people over a twenty five year term. The question is not whether your family is reliable. It is what the arrangement does when something goes wrong that nobody chose.
There are two practical protections. The first is structural: separate homes with separate mortgages, so one household's difficulty stays with that household. The second is a written agreement covering what happens if somebody cannot pay, including whether the paying household records the shortfall as a debt and what triggers a sale. Neither protection is available after the fact.
When two mortgages beat one
If both households can qualify separately for the homes they want, two mortgages is almost always the better answer even when one joint mortgage would be marginally cheaper.
You each get your own rate and term, so you can make different choices about fixed and variable. You each renew on your own schedule. One household can pay theirs down faster without a conversation. And when one household sells, the mortgage on that home is discharged without touching the other.
The case for one joint mortgage is when one household cannot qualify alone. That is a real constraint and a good reason. What is not a good reason is that a joint mortgage feels more like doing it together. The togetherness is in living in the same building, and you can have all of that with two separate loans.
Preparing an application that two households can pass
A joint application takes longer than a single one because everything doubles: two sets of income documents, two credit records, two lists of debts. The households that get through smoothly are the ones that prepare in parallel rather than in sequence.
Start by having each household list its debts honestly, including the ones people forget: a car lease, a line of credit with a zero balance but a large limit, a student loan, support payments, and any money owed to family. Lenders find these anyway, and finding them late is what turns a two week approval into a two month one.
Then clean up what can be cleaned up. Closing an unused credit card with a large limit can improve a file. Paying off a small balance can matter more than the amount suggests. Neither of these is worth doing in the fortnight before an application, which is another argument for starting early.
Be careful about big purchases during the wait, particularly on a pre-sale where completion is a year or two away. A car bought on finance in the middle of that period changes what the household can borrow at the end, and lenders do reassess. If a vehicle has to be replaced, tell your broker before you sign for it rather than afterwards.
Finally, agree who is dealing with the lender. Two households both emailing a broker with slightly different versions of the same information is a reliable way to slow a file down. Pick one person to be the point of contact and have everybody send their documents to them.
Give yourselves longer than a single household would need. A joint file has more moving parts and more people who have to find a document while they are at work, so a timeline that would be comfortable for one buyer is tight for two. If you are buying pre-sale, none of this is urgent at signing and all of it is urgent near completion, which is the best possible reason to do the preparation while there is no deadline attached to it.
Also ask what happens at renewal. A joint mortgage renews as a joint mortgage, so both households have to be willing and able to carry it again every few years. If one household's circumstances are likely to change before the first renewal, that is worth knowing now rather than at the point where the lender is asking for fresh documents.
And ask what the lender requires if one household later wants off the mortgage. The answer is usually that the remaining household must requalify for the whole loan on its own income, which many cannot do. Knowing that in advance changes how seriously families take the question of who really needs to be on the application.
One last point that saves money. Ask the lender to quote the same purchase two ways: as a joint application, and as one household borrowing alone with a documented loan from the other. Families are often surprised by how close the two come out, and seeing both numbers makes the structural decision on the rest of this hub a great deal easier.
- Each household lists every debt, including limits on unused credit
- Fix credit problems before applying, not during
- Gather income documents for everyone at the same time
- Agree a single point of contact with the lender or broker
- Ask early about the effect of an older borrower on the available term
Questions buyers ask
More in Buying With Family
Also worth reading
Where these numbers come from
Every figure on this page comes from the body that issues it. Rules and rates change, so each entry says when we checked it.
- Boldest mortgage reforms in decades come into force today. Department of Finance Canada. Published 15 December 2024, accessed 29 August 2026.
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