Mortgage Stress Test in Canada: How the Qualifying Rate Works (2026)

The mortgage stress test checks that you could keep up your payments if rates rose. Lenders work out whether you qualify using a rate higher than the one in your contract, so the mortgage you can get is smaller than your actual payment alone would allow. This page explains the rule, who it applies to and when it doesn’t. To check your own numbers, use the stress test calculator.

The qualifying rate

• You qualify at the greater of your contract rate plus 2% or 5.25%.
• It applies to uninsured mortgages (20% or more down) at federally regulated lenders, under OSFI Guideline B-20.
• Insured mortgages (under 20% down) are qualified at the same rate under the federal mortgage insurance rules, the Eligible Mortgage Loan Regulations made by the Minister of Finance.
• Your debt service ratios are calculated at that qualifying rate, not your actual rate.
• A refinance is stress-tested like a new mortgage: since November 21, 2024, OSFI exempts a stand-alone uninsured mortgage from the test only when it moves at renewal from one federally regulated lender to another with no increase in the remaining amortization and no increase in the loan amount beyond $3,000 for the costs of the move (a straight switch).
• The straight-switch exemption covers only a stand-alone uninsured mortgage: one that amortizes, isn't readvanceable and isn't part of a combined loan plan.
• In a straight switch the balance can rise by up to $3,000 to cover costs of the move such as penalties or fees, but no equity can be taken out.

OSFI calls the 2% the buffer, “a safety margin that shows that borrowers can absorb some negative impacts to their finances”, and the 5.25% the floor, which “accounts for risks that can emerge from changes in the broader economy”.

At the Bank of Canada’s average rate on new insured 5-year fixed mortgages, 4.05% (July 2026), you would qualify at 6.05%. The floor only decides the rate when your contract rate is below 3.25%.

What it does to what you can borrow

Lenders apply the qualifying rate inside the GDS and TDS ratios: your housing costs, worked out with the payment at the qualifying rate, have to stay within the limit. Take a $600,000 home bought with 20% down. The payment at the average contract rate is $2,654 a month, but lenders test your income against $3,212 a month at 6.49%. That puts the income needed at about $118,800. The affordability calculator shows the highest price your income supports under the test.

When it applies

OSFI says the switch exemption applies only “with no increase to: the amortization period, nor the loan amount”, and that lenders should still underwrite the loan soundly. For the low-ratio case, Finance Canada allows the balance to rise by up to $3,000 to cover costs such as penalties, with no equity take-out. The renewal guide explains how to use the switch rules.

Who sets it and who it covers

• Uninsured mortgages at federally regulated lenders. OSFI’s Guideline B-20 sets the rule, and OSFI “obliges federally-regulated lenders to apply this stress test”.
• Insured mortgages (less than 20% down). The federal mortgage insurance rules apply the same formula, and CMHC calculates debt service at the qualifying rate.
• Provincially regulated lenders, such as most credit unions, aren’t covered by OSFI’s guideline; their provincial regulator sets the rules.

How the rule has changed

OSFI's loan-to-income limit

Alongside the stress test, OSFI requires federally regulated lenders “to manage the volume of newly originated uninsured mortgage loans that exceed a 4.5x loan-to-income multiple” (OSFI). The limit applies to each lender’s portfolio, not to individual borrowers, so a loan above 4.5 times income can still be approved. How OSFI’s capital rules feed into rates is covered in how OSFI capital requirements affect your rate.

What helps you pass

The test compares housing costs and debts at the qualifying rate with your gross income, so anything that lowers those costs or raises the income helps:

• Paying down other debts lowers your TDS ratio.
• A larger down payment means a smaller loan; with 20% or more down there is also no insurance premium added to it.
• A co-borrower: the ratios use gross household income.
• A longer amortization, where you’re eligible, lowers the payment. For insured mortgages, 30 years is open to first-time buyers and buyers of new builds.

Related pages

• Mortgage stress test calculator
• GDS and TDS ratios explained
• CMHC mortgage insurance rules
• Recent mortgage rule changes
• Income needed to buy a house
• Mortgage rules and regulations