The mortgage stress test explained: what it is and how it affects you

In Canada, the mortgage stress test checks that you could still afford your payments if interest rates were higher. Federally regulated lenders must qualify you at the greater of your contract rate plus 2 percentage points, or 5.25%. The stress test applies to insured and uninsured mortgages. Since November 21, 2024, you can switch lenders at renewal without being re-tested if you don't borrow more or extend your amortization.

What the stress test is

When a lender decides how much you can borrow, it compares your income to your costs. The stress test changes one input: instead of using the rate you will pay (your contract rate), the lender calculates your payment at a higher qualifying rate. If you can carry the payment at that higher rate and still stay within the lender's limits, you pass.

The qualifying rate is the greater of:

• your contract rate plus 2 percentage points, or
• 5.25%, the minimum qualifying rate set by OSFI.

The test does not change what you pay. Your actual payments are based on your contract rate. The stress test only affects how much you qualify to borrow.

Who sets the stress test and which lenders apply it

The Office of the Superintendent of Financial Institutions (OSFI) regulates federally regulated lenders, including the banks, and sets the minimum qualifying rate for uninsured mortgages through its Guideline B-20. The same test applies to insured mortgages, those with less than 20% down.

We last checked OSFI's published rule on October 23, 2026. You can read OSFI's guidance at osfi-bsif.gc.ca.

Lenders that are not federally regulated, such as Ontario credit unions, are not bound by OSFI's guideline for uninsured mortgages and set their own qualifying rules for uninsured mortgages. Many of these lenders apply a similar test, but the details can differ, which is one reason it helps to compare more than one type of lender.

The debt limits the stress test is measured against

The stress-tested payment feeds into two ratios:

1. GDS (gross debt service): your housing costs as a share of your gross income. Housing costs are mortgage principal and interest, property tax, heating, and generally half of any condo fees.
2. TDS (total debt service): your housing costs plus all other debt payments, such as car loans, credit cards and lines of credit.

For insured mortgages, CMHC's limits are a GDS of up to 39% and a TDS of up to 44%. Lenders may set their own limits for uninsured mortgages.

A worked example of the stress test

These numbers use an illustrative 5% contract rate. The illustrative rate is not a quote or a rate on offer; it is chosen only to make the arithmetic easy to follow.

Say your contract rate is an illustrative 5%. The qualifying rate is the greater of 5% + 2 = 7% and 5.25%, so the lender tests you at 7%. If your contract rate were an illustrative 3%, the qualifying rate would be 5.25%, because 3% + 2 = 5% is below the minimum.

On a $500,000 mortgage with a 25-year amortization (the total time to pay it off), the monthly payment at 5% is about $2,908. At 7%, the monthly payment is about $3,502. The lender checks your ratios using the $3,502 figure, even though you would pay about $2,908.

Now look at the stress test from the income side. A household earning $120,000 a year can spend up to 39% of gross income on housing, or $3,900 a month. If property tax is $400 a month and heating is $100, the household has $3,400 left for mortgage principal and interest.

Tested at 7%, $3,400 a month supports a mortgage of roughly $485,000 over 25 years. Without the stress test, at 5%, the same payment would support about $585,000. This simplified example looks only at GDS; your other debts, through TDS, can lower the amount further.

You can run your own numbers in the affordability calculator. The calculator's results are estimates only, not an offer or advice; lender rules and your full application decide.

The renewal-switch exemption

The stress test used to apply every time you moved your mortgage to a new lender, even at renewal. Re-testing at every switch made some borrowers feel stuck with their current lender.

Since November 21, 2024, an uninsured mortgage switched to another federally regulated lender at renewal does not have to be re-stress-tested. The exemption holds as long as you do not increase the mortgage amount or the amortization. Insured mortgages can also be switched at renewal without re-qualifying (source: Canadian Mortgage Charter, Financial Consumer Agency of Canada briefing note, checked October 2026).

The exemption covers a straight switch: same balance, same or shorter remaining amortization. If you want to borrow more, for example to renovate or consolidate debt, borrowing more is a refinance, and the stress test applies again. With a federally regulated lender, a refinance can go up to 80% of your home's appraised value.

The new lender still reviews your application and makes its own decision. The exemption removes the stress test, not the lender's approval.

Ways to improve how you qualify

If the stress test leaves you short of what you need, some options to discuss are:

• Paying down other debts to lower your TDS.
• Adding a co-borrower whose income counts toward the application.
• Increasing your down payment.
• On an insured mortgage, a 30-year amortization if you are a first-time buyer or buying a new build.
• Looking at lenders whose rules differ, such as provincially regulated credit unions.

Each of these options has trade-offs, and the lender makes the final decision.

What to do next

If you're not sure how the stress test affects your purchase or renewal, use our call-me-back form and we'll walk through your numbers with you. You can also read about getting pre-approved. All approvals are subject to lender approval.