Mortgage Stress Test

How the stress test works

When you apply for a mortgage at a bank or any other federally regulated lender, you do not qualify at the rate you will actually pay. The lender must check that your finances could handle payments at the minimum qualifying rate (MQR), which is the greater of your contract rate plus 2 percentage points, or 5.25% (as of July 2026).

The "greater of" wording matters. If your contract rate is 4.5%, you are tested at 6.5%, because 4.5% plus 2 points beats the 5.25% floor. If you somehow landed a 2.9% rate, you would be tested at 5.25%, because 2.9% plus 2 points is only 4.9%. At the rates common in recent years, contract plus 2 points is almost always the binding number.

The test itself runs through the standard debt-service ratios, calculated at the MQR instead of your real rate. Gross debt service (GDS) compares housing costs (mortgage payment, property taxes, heat, half of condo fees) to gross income, with a typical cap around 39% (as of July 2026). Total debt service (TDS) adds all other debt payments, with a typical cap around 44% (as of July 2026). If the ratios fit at the higher rate, you qualify.

The test applies whether your down payment is under 20%, which makes the mortgage insured and requires mortgage default insurance, or 20% and up (uninsured). It applies to fixed and variable-rate mortgages alike; for a variable, the contract rate used is the rate in effect when you apply. One thing it never does: change what you pay. Your actual payments are always based on your contract rate. The MQR is purely a qualification hurdle.

Why the test exists

Canadian mortgages combine long payoff schedules with short rate guarantees. Your mortgage term is usually 5 years or less, so most borrowers will renew several times at whatever rates the market offers. The stress test forces a buffer into the approval: if you can carry the loan at 2 points above today's rate, a rate jump at renewal is less likely to sink you.

The modern regime took shape in two steps. The federal government imposed a qualifying-rate test on insured mortgages in late 2016, and OSFI, the federal banking regulator, extended it to uninsured mortgages in January 2018 through Guideline B-20. The current formula, contract plus 2 points with a 5.25% floor, has been in place since June 2021 (as of July 2026). Borrowers who qualified through 2020 and 2021 at tested rates near 5.25% and then renewed into 2023 and 2024 rates got a live demonstration of why the buffer exists.

The November 2024 change: switching lenders at renewal

For years, the test had an awkward side effect at renewal. Staying with your current lender never required requalification, but moving the same mortgage to a competitor did, which meant a borrower who no longer passed the stress test was effectively trapped with their existing lender and had little leverage to negotiate.

That changed on November 21, 2024. Since then, a straight switch of an uninsured mortgage to a new federally regulated lender at renewal, meaning the same loan amount and the same remaining amortization period, no longer requires requalifying under the MQR (as of July 2026). Insured mortgage switches were already exempt.

The exemption is narrow. Refinancing, borrowing new money, or re-extending the amortization still triggers the full stress test at the new lender. And renewing with your current lender remains test-free, as it always was.

What the test does to your buying power

Qualifying at 2 points above your contract rate shrinks the maximum mortgage you can be approved for, typically by somewhere in the range of 15% to 20%.

As a rough illustration (as of July 2026), take a household that can devote $2,800 a month to the mortgage payment itself. At a 4.24% contract rate over 25 years, that payment supports a mortgage of roughly $520,000. Tested at 6.24%, the same $2,800 supports only about $428,000. The stress test trims roughly $90,000, about 18%, off the maximum loan, even though the borrower would actually pay the lower rate.

Who is not covered: credit unions and private lenders

Guideline B-20 binds federally regulated lenders: banks, federal trust companies and similar institutions. Credit unions and caisses populaires are provincially regulated, so they may apply different qualifying rules, and some will qualify borrowers at less than the full MQR. Private and alternative lenders sit outside the framework entirely.

These routes can rescue an application that narrowly fails the test, but they usually come with higher rates or fees. Qualifying more easily for a loan you could not survive a rate shock on is not obviously a win; the test exists precisely to flag that risk.