Buyer guide

The mortgage
stress test,
explained.

Canada's mortgage stress test has been one of the most misunderstood rules in real estate since it was introduced in 2018. Here's exactly what it is, how it affects your buying power, and how to calculate your qualifying rate right now.

Use the calculator below to see your stress test rate and maximum purchase price in real time.

What is the stress test?

A rule that tests your ability to handle higher rates.

The mortgage stress test requires Canadian lenders to qualify you at a rate higher than your actual mortgage rate — to ensure you could still afford your payments if rates rise after you sign.

It was introduced by OSFI (the federal banking regulator) to reduce the risk of borrowers being overextended if interest rates increase.

The stress test formula

Qualifying rate = higher of

Your contract rate + 2%
— or —
5.25% minimum floor

Whichever number is higher is the rate lenders use to calculate your maximum mortgage. As of 2025, with most fixed rates around 4.5–5%, your qualifying rate is typically 6.5–7%.

In practice, the stress test reduces your maximum purchase price by roughly 15–20% compared to what you'd qualify for at your actual mortgage rate.

Real examples

How the stress test affects your buying power.

Contract rate	Stress test rate	Difference	Impact on max purchase
3.50%	5.50%	+2.00%	↓ ~18% less buying power
4.00%	6.00%	+2.00%	↓ ~17% less buying power
4.50%	6.50%	+2.00%	↓ ~16% less buying power
5.00%	7.00%	+2.00%	↓ ~15% less buying power
3.00%	5.25%	Floor applies	↓ ~20% less buying power

Note: Buying power impact varies based on income, amortization, and other debt obligations. Use the calculator below for your specific numbers.

Stress test calculator

Calculate your qualifying rate.

Mortgage Stress Test Calculator

Enter your details to see your stress test qualifying rate and estimated maximum purchase price.

Annual household income $120,000

Your contract rate 4.50%

Down payment $100,000

Monthly debt payments $0

Stress test rate

6.50%

Rate lenders use to qualify you

Max purchase price

$612,000

Based on 39% GDS · 25yr amortization

Max mortgage

$512,000

Purchase price minus down payment

Monthly payment

$3,540

At your actual contract rate

Estimates only. Based on 39% GDS ratio, 25-year amortization, property tax estimate of $400/month. Actual qualification depends on lender, credit score, and employment type. Consult Shanna and a mortgage broker for your specific situation.

How to work with it

Strategies that help.

Increase your income documentation. Lenders use gross income. If you have rental income, commission, or bonuses, ensure these are properly documented to maximize your qualifying income.

Reduce existing debt. Every dollar of monthly debt reduces your qualifying power by roughly $5–6 in purchase price. Paying off a car loan or line of credit before applying can meaningfully increase your maximum.

Larger down payment. A bigger down payment directly increases your maximum purchase price dollar for dollar — and reduces the mortgage you need to qualify for.

Choose the right lender. Mortgage brokers have access to lenders with different qualifying criteria. Some credit unions and alternative lenders qualify using the contract rate only — bypassing the stress test. These come with trade-offs. Shanna can connect you with the right broker.

Extend amortization. A 30-year amortization (available with 20%+ down) lowers your monthly payment, which can help you qualify for more under the GDS ratio.

Get pre-approved early. Rate holds lock in your qualifying rate for 90–120 days. If rates rise, you're protected. If they fall, you get the lower rate.

Want to know exactly what you qualify for?

Shanna can connect you with a trusted Calgary mortgage broker who will run your full qualification scenario — at no cost, no obligation.

Talk to Shanna Back to buyer guide

The mortgagestress test,explained.

A rule that tests your ability to handle higher rates.

How the stress test affects your buying power.

Calculate your qualifying rate.

Strategies that help.

Want to know exactly what you qualify for?

Stay one step aheadof the market.

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The mortgage
stress test,
explained.

Stay one step ahead
of the market.