The Mortgage Stress Test: Why You Qualify for Less Than You Expect

Buyers tell me their rate is 4.6%, so we run the numbers at 4.6%, and then the lender comes back with a smaller approval than either of us expected.

The reason is that no federally regulated lender in Canada qualifies you at the rate you will actually pay.

The two numbers

Every application is tested at the higher of:

• your contract rate plus two percentage points, or
• 5.25%

A contract rate of 4.6% is tested at 6.6%. A contract rate of 2.9% is tested at 5.25%, because 4.9% falls under the floor. You face one number, whichever is larger.

You make payments at your contract rate. You are approved as though you were paying the tested rate.

Who this applies to

The rule comes from Guideline B-20, issued by the Office of the Superintendent of Financial Institutions. It covers every federally regulated lender: the big banks, most trust companies, and the monoline lenders that fund a large share of broker business.

It applies to:

• Insured mortgages, where the down payment is under 20%
• Uninsured mortgages, at 20% down and above
• Purchases and refinances
• Switching your mortgage to a new lender, which is treated as a new application

It does not apply to a straight renewal with your existing lender where nothing about the loan changes. Federal rules introduced in late 2024 also allow uninsured borrowers to move a mortgage to a new lender at renewal without requalifying, provided the amount and amortization stay the same. Confirm your own situation before you assume you are stuck.

Credit unions in BC are supervised provincially by BC Financial Services Authority rather than by OSFI, so they set their own policy. Most apply something similar. A few qualify at a lower rate, which produces a larger approval, usually paired with a higher contract rate.

What it does to a Metro Vancouver budget

Two extra percentage points of qualifying rate cuts the supported mortgage by roughly 15 to 20 percent. The exact figure depends on amortization, income, debts, and the property's tax and strata cost.

At the price points that matter here, that is the difference between a two-bedroom and a one-bedroom, or between a townhome and a condo. If you have been reading our Coquitlam townhome buyer's guide and wondering why the numbers feel out of reach, this is usually why.

The ratios underneath it

Lenders run two calculations, both using the tested rate.

Gross debt service (GDS) is your housing cost as a share of gross income:

• the mortgage payment at the tested rate
• property tax
• heating
• 50% of the strata fee, where there is one

Total debt service (TDS) adds every other monthly debt payment: car loans, student loans, credit card minimums, line of credit payments, support payments.

Typical ceilings are 39% GDS and 44% TDS. Strong credit, a large down payment, or significant savings can push those higher at some lenders.

Two details cost buyers real money here:

The strata fee counts. Half of it lands in GDS. A $650 monthly fee on a larger older building puts $325 into the calculation before you have paid a dollar of mortgage. That is one reason the buildings in our strata fees explained piece are worth comparing on fee as well as price.

Revolving debt counts at the minimum payment. A $12,000 line of credit balance is counted at the lender's assumed payment even if you plan to clear it next month. Paying it off before you apply moves your approval more reliably than shopping for a rate 10 basis points lower.

Four ways to move the number

Clear revolving balances. Credit cards and lines of credit hit TDS directly. This is usually the largest single lever available to a buyer in the weeks before an application.

Extend the amortization. Thirty years lowers the monthly payment in the ratio, so it qualifies you for more than 25 years at the same rate. It is available on uninsured mortgages, and since August 2024 on insured mortgages for first-time buyers and for newly built homes. You pay more total interest, so this is a trade rather than a free gain.

Add a co-borrower. Both incomes go in, and so do both sets of debts. A parent with a clean balance sheet raises the number. A sibling with a car loan may not.

Increase the down payment. This does not change the tested rate. It reduces the loan you need, which can be the same outcome for your purchase price.

Where buyers get caught

The failure I see most often is a subject-free offer written on a verbal pre-approval.

A pre-approval reflects the lender's view of your income, credit and debts before anyone has looked at a property. The final approval also considers the home itself: the appraised value, the strata documents, the age and condition of the building, and in some cases the size of the unit. Small studio units and buildings with litigation or large upcoming levies can be declined on the property side even when the borrower is strong.

A financing subject exists so that gap has somewhere to land. Our piece on what subject-free actually means covers what you are giving up when you remove it.

What this comes down to

• You are tested at contract rate + 2 points, or 5.25%, whichever is higher.
• It applies at any down payment, insured or uninsured.
• A straight renewal with your current lender does not require requalifying.
• Expect roughly 15 to 20 percent less mortgage than your contract rate alone suggests.
• Half the strata fee and every revolving minimum payment are in the ratios.
• Clearing debt and extending amortization move the number more than rate shopping does.
• Run your own numbers through the mortgage affordability calculator to see your maximum mortgage under these same GDS and TDS ratios.
• Contact our team to work backwards from a real approval, or browse listings inside the range it produces.

Plan your next step

Run through search preparation before you talk to a lender, so the conversation starts with real numbers. If you are weighing buildings, strata review covers the documents that affect both your approval and your monthly cost.