If you're getting a mortgage from a federally regulated lender in Canada, you almost always have to qualify at a higher rate than the one you'll actually pay. This is the mortgage stress test, formally called the Minimum Qualifying Rate. As of 2026, you must qualify at the greater of your contract rate plus 2%, or a benchmark rate of 5.25%, a rule set by the Office of the Superintendent of Financial Institutions (OSFI) on June 1, 2021, and still in force today. Understanding how this test works can help you plan a realistic home shopping budget before you make an offer.
How the qualifying rate is calculated
The stress test uses whichever number is higher: your actual contract rate plus 2 percentage points, or the flat 5.25% benchmark set by OSFI. In most rate environments, the plus-2% calculation ends up being the binding number, since it tends to sit above 5.25%. Your lender runs this math on your income and debts to decide how much you can borrow, not what you'll actually pay each month. Two borrowers with the same income can end up qualifying for very different mortgage amounts depending on the rate their lender offers them.
Why the stress test exists
OSFI introduced the qualifying rate to make sure borrowers can still afford their payments if interest rates rise or their financial situation changes after closing. It's an underwriting safeguard, not a penalty, and it applies on top of your lender's normal review of your income, credit, and debt levels under OSFI's B-20 guideline. The goal is to reduce the risk of widespread payment shock across the mortgage system, particularly for borrowers who might otherwise take on more debt than they could comfortably manage in a higher-rate environment.
Who has to pass it
Anyone taking out a new mortgage with a federally regulated lender, such as a bank, generally has to qualify using the MQR, whether the mortgage is insured or uninsured. This includes new purchases, most refinances, and lender switches that don't meet the exemption criteria described below. Provincially regulated lenders, such as many credit unions, aren't bound by OSFI's rule, though many apply similar qualifying standards on their own, so it's worth asking directly how a specific lender underwrites its mortgages.
Who is now exempt
Some borrowers no longer have to pass the stress test. Insured mortgages have been exempt from the MQR at switch or renewal for some time, a position reaffirmed in the Canadian Mortgage Charter in October 2023. Since November 21, 2024, OSFI has extended a similar exemption to a "straight switch," where a borrower moves an existing uninsured mortgage to a new federally regulated lender at renewal with no increase to the loan amount or amortization. Lenders still underwrite these switches soundly under B-20, they just aren't required to apply the prescribed 5.25%/contract-plus-2% test to them.
What it means for your affordability
Because the stress test qualifies you at a rate higher than what you'll pay, it effectively lowers the mortgage amount you can be approved for compared to qualifying at your contract rate alone. This matters most for buyers stretching their budget or renewing with a lender change, since the math can limit your options even when your actual monthly payment would be manageable on your income. It's also worth remembering that the stress test applies to the qualifying decision only, it doesn't change your actual interest rate or payment once your mortgage is in place.
Getting ahead of the qualifying rate
Working with a mortgage broker can help you understand how the qualifying rate affects your specific numbers before you shop for a home or a new lender. A broker can also help you figure out whether an exemption, like the straight switch rule, applies to your situation at renewal, and can compare federally regulated and provincially regulated lenders side by side so you understand how each one will assess your application.
Have questions about your situation? An advisor can walk you through it.