The Mortgage Stress Test, Explained for Multiplex Buyers in BC

Maya and Arjun sat across from their mortgage advisor with a number in their heads: $819,000. That was the mortgage their $150,000 household income could carry at the rate the bank had quoted them. Then the advisor ran the stress test, and the number on the screen dropped to about $673,000. Same couple, same income, same bank, about $145,000 less. Nobody had warned them.

We meet buyers at this exact moment all the time, usually after they have already fallen for a specific multiplex unit. So this post explains the mortgage stress test the way we wish someone had explained it to Maya and Arjun: what it is, the exact rate you will be tested at this month, how much buying power it removes, and the honest ways to get some of that power back. The scenario throughout is the one most of our readers are in: buying a single strata unit in a brand-new multiplex, often at pre-sale.

What the stress test actually is

The stress test is a qualifying rule, not a payment. When a bank decides how much to lend you, it does not use the interest rate you will actually pay. It pretends your rate is higher, recalculates the monthly payment at that pretend rate, and checks whether your income could carry it. If yes, you qualify. Your real payments still happen at your real contract rate.

The rule comes in two matching pieces. For mortgages with less than 20 per cent down (which are insured), the federal Department of Finance sets the test. For mortgages with 20 per cent or more down at banks and other federally regulated lenders, the banking regulator OSFI sets it through its minimum qualifying rate. Both currently work the same way: you must qualify at the higher of 5.25 per cent or your contract rate plus 2 percentage points.

According to OSFI's published minimum qualifying rate policy, that floor-plus-buffer structure remains in force, and Canadian Mortgage Trends reported in January 2026 that OSFI reviewed the rule and left it unchanged. So as of August 2026, this is the test you will face.

The number you will be tested at this month

The test rate moves with real rates, so here is the current picture. Ratehub's rate tables showed the best high-ratio 5-year fixed rate in Canada at 4.04 per cent as of August 14, 2026, while Canada's big six banks averaged 4.92 per cent on the same term. The Bank of Canada, for context, held its policy rate at 2.25 per cent on July 15, 2026, its sixth straight hold.

Run those through the rule. A 4.04 per cent contract rate plus 2 points is 6.04 per cent, which beats the 5.25 per cent floor, so 6.04 per cent is your test rate. At a big-bank rate of 4.92 per cent, you would be tested at 6.92 per cent. Notice something useful there: shopping for a lower contract rate lowers your test rate too, dollar for dollar. In our opinion this is the single most underrated reason to rate-shop before you fall in love with a floor plan.

How much buying power the test removes

Back to Maya and Arjun. Household income $150,000 before tax. They are looking at a three-bedroom strata unit in a new fourplex with a $400 monthly strata fee, and we will assume $250 a month in property taxes and $100 for heat, which are typical for this kind of home. Their bank caps housing costs at 39 per cent of gross income, the standard CMHC guideline, which gives them $4,875 a month for housing. Lenders count the mortgage payment, property taxes, heat, and half the strata fee against that cap, so after $550 of non-mortgage costs, $4,325 a month is available for the mortgage payment itself.

Now the two calculations, both on a 25-year amortization with Canadian semi-annual compounding:

• Without the stress test, qualifying at their actual 4.04 per cent contract rate (about $528 per month per $100,000 borrowed), $4,325 a month supports a mortgage of roughly $819,000.
• With the stress test, qualifying at 6.04 per cent (about $642 per month per $100,000), the same $4,325 supports roughly $673,000.

The test removes about $145,000 of borrowing room, a cut of nearly 18 per cent. That is the difference between two units in the same building, or between a corner home and a middle one. And here is the part that softens the blow: if they borrow the $673,000 they qualify for, their real payment at 4.04 per cent is about $3,555 a month, not $4,325. The gap between those two numbers is the cushion the rule forces you to hold.

All of these figures are our own calculations from the rates cited above, and your lender's numbers will differ a little with your exact taxes, fees, and credit profile. Treat them as the shape of the math, not a quote.

The brand-new home bonus: 30-year amortization

Here is where buying a brand-new multiplex unit quietly helps you. Since December 15, 2024, federal rules allow 30-year amortizations on insured mortgages for first-time buyers and for anyone buying a newly built home that has never been lived in, and the insured price cap is $1.5 million, per the Department of Finance. A new multiplex unit is exactly that kind of home.

Stretching Maya and Arjun's amortization from 25 to 30 years drops the tested payment per $100,000 from about $642 to about $597 at 6.04 per cent. Their $4,325 a month now supports roughly $724,000 instead of $673,000, about $51,000 more room. The trade-off is real (more total interest over the life of the loan, equity that grows more slowly), but as a qualifying tool for a new home it is real room that buyers of older resale homes do not automatically get.

What lenders count besides the rate

The test rate gets the headlines, but two ratios do the actual work. The first caps your housing costs (mortgage payment at the test rate, property taxes, heat, half the strata fee) at around 39 per cent of gross income. The second caps housing costs plus all other debt payments (car loans, student loans, credit lines, credit card minimums) at around 44 per cent. Those are CMHC's standard limits for insured mortgages; individual lenders can be stricter.

The second ratio surprises people. A $700 monthly car payment does not feel like a housing decision, but under the 44 per cent cap it can erase roughly $100,000 of mortgage room at today's test rates. We have watched a buyer's budget jump an entire bedroom category because a lease ended two months before their application. If a big loan is close to paid off, finish it before you apply.

Honest ways to pass the test with room to spare

• Shop the contract rate. Every 0.10 per cent off your contract rate is 0.10 per cent off your test rate. The spread between the best market rates and the big-bank average was almost 0.9 points in mid-August 2026, which is enormous at qualification time.
• Use the 30-year amortization. Available on insured mortgages for brand-new homes and first-time buyers, as above. It exists precisely to help buyers like you qualify.
• Clear small debts first. Car payments and credit lines eat the 44 per cent cap fast. Paying off a $400 monthly obligation can add tens of thousands in mortgage room.
• Add a co-borrower. Multiplexes attract multigenerational families for a reason. A parent or sibling on the application adds their income to the test, and each family can still hold its own unit and title.
• Get a rate hold. Many lenders will hold a rate for 90 to 120 days. If rates rise while you shop, your test rate stays where it was locked.
• Do not count on exemptions. The only meaningful one: since November 21, 2024, OSFI lets borrowers with uninsured mortgages switch lenders at renewal without re-testing, if the loan amount and amortization stay the same. Helpful in year five, irrelevant on purchase day.

What this means for a pre-sale multiplex unit

Pre-sale buying adds a timing wrinkle that catches people. When you sign a pre-sale contract, you commit to the purchase now, but your mortgage is usually finalized close to completion, which can be a year or more away. You will be stress-tested against the rates in force then, not the rates in force today. Nobody knows what those will be, including us.

Our advice, and this is opinion built from watching it go both ways: qualify with a cushion. If the test says you can carry $724,000, do not sign for a unit that needs every dollar of it. Ask the seller's team which lenders have approved the building and whether any offer long rate holds for pre-sale buyers; some hold rates for extended periods on new projects. And revisit your finances with your advisor every few months between signing and completion, so a rate move never arrives as a surprise.

One more pre-sale note: your deposit money is separate from all of this. The stress test governs the mortgage. Deposits, typically paid in stages and held in trust under BC law, come from your own savings and are not part of the qualifying math until they count as your down payment at completion.

What this comes down to

• You are tested at the higher of 5.25 per cent or your contract rate plus 2 points. With the best market rates near 4.04 per cent in mid-August 2026, most buyers are tested at just over 6 per cent.
• The test cuts borrowing power by roughly 18 per cent at current rates. Budget from the tested number, not the quoted-rate number.
• Your actual payment is calculated at your real contract rate. The test only decides how much you can borrow, and it forces a cushion into your budget.
• Brand-new homes qualify for 30-year insured amortizations under the December 2024 federal rules, which adds meaningful qualifying room. Multiplex buyers should use this.
• Other debts count. Clearing a car payment before applying can matter more than a small raise.
• Pre-sale buyers are tested at completion-time rates, so qualify with a margin and check in with your lender while you wait.

Questions buyers ask us

What is the mortgage stress test in one sentence?

It is a rule that makes your lender check whether you could still afford your mortgage if your interest rate were at least 2 percentage points higher than the one you actually signed, with a floor of 5.25 per cent. You qualify at the pretend rate but pay the real one.

What rate will I be tested at right now?

The higher of 5.25 per cent or your contract rate plus 2 points. With Ratehub showing the best high-ratio 5-year fixed at 4.04 per cent as of August 14, 2026, a buyer at that rate is tested at 6.04 per cent. At the big-bank average of 4.92 per cent, the test rate is 6.92 per cent.

Does the stress test change my monthly payment?

No. Your payment is always calculated at your real contract rate. The test only limits how large a mortgage you can take. The gap between the tested payment and your real payment works like a built-in safety margin in your monthly budget.

Does the stress test apply to pre-sale multiplex purchases?

Yes, when the mortgage is finalized, which for a pre-sale is usually close to completion. You will be tested against the rates in force at that time, not today's. That is why we tell pre-sale buyers to qualify with a cushion rather than at their absolute maximum.

Do credit unions use the stress test?

OSFI's rule binds federally regulated lenders such as banks. Credit unions in BC are provincially regulated and set their own qualifying standards, though many apply a similar test by choice. If you are close to the line, a mortgage advisor can tell you which lenders fit your file.

How much income do I need for a $700,000 mortgage?

At a 6.04 per cent test rate over 25 years, a $700,000 mortgage carries a tested payment of about $4,495. Add our example's $550 in taxes, heat, and half strata fee, and a 39 per cent housing cap points to roughly $155,000 in gross household income. Your exact costs will shift this.

Can two family members combine incomes to qualify?

Yes. Joint mortgages are common in multiplex buildings, where parents and adult children often buy units in the same project. Everyone on the application has their income and their debts counted, and everyone on title shares legal responsibility for the loan, so agree on the plan in writing first.

Does a 30-year amortization help me qualify?

Yes. Since December 15, 2024, insured mortgages allow 30-year amortizations for first-time buyers and buyers of newly built homes, per the Department of Finance. In our worked example it added about $51,000 of borrowing room. The cost is more total interest over the life of the mortgage.

Do my car loan and credit cards affect the test?

Directly. Lenders cap your housing costs plus all other debt payments at around 44 per cent of gross income. A $700 monthly car payment can remove roughly $100,000 of mortgage room at current test rates. Paying off a loan that is nearly done can beat waiting for a raise.

Will rental income from a lock-off suite count?

Sometimes. If the unit you are buying includes a legal secondary suite, many lenders count a portion of the expected rent toward your qualifying income, but policies differ widely between lenders. Never assume it. Ask your advisor to confirm the exact treatment in writing before you rely on it.

Is the stress test going away?

Not soon. Canadian Mortgage Trends reported in January 2026 that OSFI reviewed the minimum qualifying rate and left it in place, alongside loan-to-income limits it applies to lenders. The regulator revisits the rule regularly, but as of August 2026 you should plan on being tested.

What happens to the stress test at renewal?

If you renew with your current lender, there is no new test. Since November 21, 2024, borrowers with uninsured mortgages can also switch lenders at renewal without re-testing, provided the loan amount and amortization stay the same. Insured mortgages have long had similar switching freedom.

Does the Bank of Canada rate set the stress test?

Only indirectly. The Bank of Canada's policy rate (held at 2.25 per cent on July 15, 2026) influences the mortgage rates lenders offer, and your test rate is your contract rate plus 2 points. The 5.25 per cent floor only matters when contract rates fall below 3.25 per cent.

Run your own numbers with us

The stress test decides your budget, so find your tested number before you tour homes, not after. Browse the current multiplex homes to see what real units cost in the neighbourhoods you want, then get in touch and tell us your income, your debts, and your down payment. We will walk you through the same math you saw here, with your numbers, and point you at the units your tested budget genuinely covers.