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Ryan GraftonMortgage Architects

The stress test, in plain English

By Ryan Grafton · November 4, 2026 · 4 min read

Last updated: November 4, 2026

When you apply for a mortgage, there are two numbers in play. There's the rate you'd pay, and a higher rate you have to qualify at.

You only ever pay the first one. The second one decides how much a lender will lend you.

That second number is the stress test. It sounds scary. It isn't, once you see what it does.

Two rates, two jobs

The rate you pay is your contract rate. It's the one in your mortgage, and it's what your payment is based on.

The rate you qualify at is called the minimum qualifying rate. The lender works out what your payment would be at that higher rate, then checks your income could still carry it along with your other debts.

Think of it as a what-if. OSFI, the federal regulator for banks, calls the extra a safety margin, so you can absorb a hit to your finances.

Where the qualifying rate comes from

It's the greater of two things:

  • Your contract rate plus 2%
  • A floor of 5.25%

Whichever one's higher is the rate you're tested at.

Who sets it depends on your down payment. With 20% down or more, your mortgage is usually uninsured, and OSFI sets the rate for federally regulated lenders. With under 20% down, your mortgage is insured, and the federal Department of Finance sets it.

It's the same formula either way. It doesn't change with the town, so it works the same in Trail as it does in Nelson.

It changes your maximum, not your payment

This is the part that trips people up.

The stress test doesn't change what you pay each month. Your payment's still based on your contract rate.

What it changes is the biggest mortgage you can get. Same income, same down payment, smaller number at the top of the page.

Here's why. A lender adds up your housing costs and your other debts, then compares them to your income, and it does that at the qualifying rate. On CMHC-insured mortgages, the limits are 39% of your gross income for housing costs and 44% once your other debts are in. Lenders set their own limits on uninsured mortgages.

The affordability calculator runs all of this for you. It's an estimate, but it'll show you the qualifying rate and what it does to your budget.

What moves your number

Three things.

Your monthly debts. Car payments, student loans, credit cards and lines of credit all count. A card balance you've been rolling for a year costs you real borrowing room.

Your amortization. That's how long you're taking to pay off the whole mortgage. A longer one means a smaller payment at the qualifying rate, so you can often qualify for more. It also means paying interest for longer.

Your down payment. More down means a smaller mortgage to test. It also changes which amortizations you can get. With under 20% down, the longest is 25 years, or 30 for first-time buyers and newly built homes.

Those are the levers worth looking at before you shop. Paying down a monthly debt can do more than people expect.

One case where it eases up

Say your term's ending and you'd like to move to another lender.

Since November 21, 2024, OSFI doesn't require the qualifying rate when you move an uninsured mortgage from one federally regulated lender to another at renewal. You can't add to the loan or stretch the amortization. That's called a straight switch.

Two things to know. The new lender still reviews your file and can use its own numbers. And it only covers federally regulated lenders. Credit unions in BC are regulated by the province, so their rules can differ. Ask before you count on it.

There's more on that in the renewal article.

Where to start

Run your numbers through the calculator first. It takes the mystery out of it.

If the result isn't what you hoped for, book a 15-minute call and we'll look at what's moving it.

This is general information from Ryan Grafton, Mortgage Broker, not advice for your situation. Estimates only. This isn't advice, a rate quote or a pre-approval. Your real numbers depend on your lender and your approval. Rules as checked on November 4, 2026.

Sources

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