Mortgage stress test in Canada: the qualifying rate, the math, and who skips it

The stress test is the reason a lender can quote you 4.5% and still say you only qualify for less than you hoped. Here is the exact rule, a calculator that runs it on your numbers, and the renewal exemption most people have never heard of.

Mortgage stress test calculator

The rule in one line

Federally regulated lenders, like banks, require you to prove you can afford your mortgage at a qualifying rate that is usually higher than the rate in your contract. The Financial Consumer Agency of Canada (FCAC) states it plainly: banks must use the higher of 5.25% or the rate you negotiate plus 2%, and that is the case for insured and uninsured mortgages.

The Office of the Superintendent of Financial Institutions (OSFI), which sets the rule for uninsured mortgages at federally regulated lenders, calls this the minimum qualifying rate (MQR). Its page lists two parts:

• The buffer: 2%. A safety margin added to your contract rate.
• The floor: 5.25%. The lowest qualifying rate, no matter how low your contract rate is.

OSFI says it reviews both numbers at least annually. As of its page updated January 29, 2026, they are unchanged at 2% and 5.25%.

Quick reference: the floor only matters when your contract rate is below 3.25%. At 3% the buffer gives 5%, so the 5.25% floor applies. At anything from 3.25% up, it is simply your rate plus 2.

Important: you do not pay the qualifying rate. It is only used to test affordability. Your actual payment is based on your contract rate.

GDS and TDS: the two ratios the test feeds

The stress test does not produce a yes or no on its own. It plugs a higher payment into two ratios lenders use to judge affordability. The FCAC describes them this way:

• Gross debt service (GDS): your monthly housing costs should not be more than 39% of your gross household income. Housing costs are the mortgage payment, property taxes, heating, and 50% of condo fees if you have them.
• Total debt service (TDS): housing costs plus all your other debt payments should not be more than 44% of gross income. Other debts include credit card payments, car loans, lines of credit, student loans, and child or spousal support.

The FCAC notes you may still qualify if a ratio is slightly higher, but that you increase the risk of taking on more than you can afford. Each lender sets its own policies, so treat 39% and 44% as the common guide, not a hard law.

This is where other debt hurts the most. Every dollar of a car payment or minimum credit card payment counts fully in TDS. If you are shopping for a home, our guide to credit utilization explains how card balances also show up on your credit report.

Worked example: why $500,000 fails by a hair

A couple earns $120,000 a year combined, so $10,000 a month gross. They want a $500,000 mortgage over 25 years at a 4.5% contract rate. Property tax is $400 a month, heating $100, no condo fees, and they pay $600 a month on a car loan and a line of credit.

• Qualifying rate: the higher of 5.25% or 4.5% + 2% = 6.5%
• Payment at the contract rate (4.5%): $2,767.36 a month. That is what they would actually pay.
• Payment at the qualifying rate (6.5%): $3,349.12 a month. That is what the test uses.
• GDS at 6.5%: ($3,349.12 + $400 + $100) ÷ $10,000 = 38.5%. Under 39%, passes.
• TDS at 6.5%: ($3,349.12 + $400 + $100 + $600) ÷ $10,000 = 44.5%. Over 44%, fails.

The $600 of other debt is what tips them over. Work backwards: under the 44% TDS guide, the most they can spend on the mortgage payment is $4,400 − $400 − $100 − $600 = $3,300 a month. At 6.5% over 25 years, a $3,300 payment supports a mortgage of about $492,667. Without the stress test, the same $3,300 at 4.5% would support about $596,235. That gap of roughly $103,600 is the stress test in a single number.

Now look at the levers. If they paid off the $600 of other debt, the GDS limit becomes the binding one: $3,900 − $500 = $3,400 a month, which supports a larger mortgage at 6.5%. A smaller loan, a bigger down payment, or a longer amortization where eligible all change the result. Try each one in the calculator above.

Who has to pass it, and who skips it

You will face the stress test if you:

• Get a new mortgage from a federally regulated lender, such as a bank.
• Refinance your home, or take out a home equity line of credit. The FCAC lists both.
• Borrow from a lender that is not federally regulated that chooses to apply it. The FCAC notes some do.

You can skip it at renewal if you make a straight switch

Effective November 21, 2024, OSFI stopped expecting federally regulated lenders to apply the MQR when an uninsured borrower switches to a new federally regulated lender at renewal, as long as there is no increase to the amortization period and no increase to the loan amount. OSFI calls this a straight switch. Lenders still have to underwrite you soundly under Guideline B-20, so they still look at your income and debts. They just do not have to add the 2% buffer.

For insured, low-ratio mortgages (loan-to-value up to 80%), the Department of Finance aligned the mortgage insurance rules, effective December 16, 2024. Under its straight switch criteria, the mortgage must have started at a federally regulated lender and been assessed at the qualifying rate, you must keep your existing amortization schedule, and the balance can rise by up to $3,000 to cover transaction costs such as penalties or fees. No equity take-out.

Why it matters: before these changes, a borrower whose income had dropped could feel stuck with their current lender at renewal because they might not pass the test elsewhere. Now shopping around at renewal is easier. The mortgage renewal guide covers the 21-day renewal statement and how to compare offers.

Renewing with your own lender

Staying with your current lender at renewal on the same terms is not a new mortgage, so the qualifying rate rule for new loans does not come into it in the same way. If you ask to increase the loan or refinance, expect to be tested.

Options people compare if they fall short

None of these is right for everyone. The goal of the test is a payment you can still carry if rates rise or income dips, so passing it by stretching every lever is not the same as being comfortable. Our variable vs fixed guide shows how rate choice changes the payment you live with after you qualify, and the calculators page has more mortgage tools.

How to run your own stress test before you apply

1. Add up gross household income from pay stubs or notices of assessment.
2. List monthly property tax, heating, half of any condo fee, and every debt payment.
3. Take the best rate you have been quoted and add 2%, or use 5.25% if that is higher.
4. Calculate the payment at that rate and divide housing costs by monthly income (GDS), then add debts (TDS).
5. If either ratio is over the guide, test the levers above before you shop. The FCAC's Mortgage Qualifier Tool does a similar check.

Sources

Office of the Superintendent of Financial Institutions, Minimum qualifying rate for uninsured mortgages (5.25% floor, 2% buffer, straight switch exemption, page modified January 29, 2026) and OSFI exempts uninsured mortgage straight switches from the prescribed MQR. Financial Consumer Agency of Canada, Preparing to get a mortgage (GDS 39%, TDS 44%, what counts, stress test for insured and uninsured, refinancing and HELOCs). Department of Finance Canada, "Straight Switches" and portfolio insurance (insured low-ratio switch criteria, $3,000, December 16, 2024). Payment and ratio figures computed by Looni with semi-annual compounding.

A lower payment can help you qualify. See 30-year amortization in Canada for the rules, the 0.20% CMHC surcharge and the extra interest.