Understanding How Mortgage Rates Work in…

Mortgage rates feel mysterious because two very different forces set them: broad market conditions, which you cannot control, and your personal borrowing profile, which you largely can. Understanding the split makes it far easier to see why two people can be quoted different rates on the same day.

What Sets Variable Rates

Variable mortgage rates are priced off each lender's prime rate, which moves with the Bank of Canada's overnight rate. Your contract is expressed as a discount or premium to prime — for example, prime minus a set amount. When the Bank of Canada changes the overnight rate, prime typically follows within days, and your variable rate changes with it.

Depending on your contract, a rate change either adjusts your payment amount or keeps the payment fixed and changes how much of it goes to principal.

What Sets Fixed Rates

Fixed rates are driven by the bond market rather than the Bank of Canada directly. Lenders fund fixed mortgages using bond markets, so the Government of Canada 5-year bond yield is the key benchmark for 5-year fixed pricing. When yields rise, fixed rates tend to follow; when yields fall, fixed rates usually ease.

This is why fixed rates sometimes move weeks before a Bank of Canada announcement — bond markets price in expectations ahead of time.

The Lender's Spread

On top of funding costs, lenders add a spread to cover operating costs, risk, and profit. Competition matters here: when lenders want market share, spreads compress and rates improve even if funding costs have not changed.

What You Control

Your personal profile determines where you land within the range a lender offers:

Credit score and history — stronger credit generally unlocks better pricing tiers

Down payment or equity — insured mortgages under 20% down often price lower than uninsured, because the lender carries less risk

Property type and use — owner-occupied homes typically price better than rentals, second homes, or unique properties

Amortization — longer amortizations may carry a small rate premium

Income documentation — traditional employment income is simplest; self-employed and commission income may require alternative programs

These factors are often worth more than shopping a single lender's advertised rate.

Posted Rate vs. Discounted Rate

The posted rate you see in a bank branch is a benchmark used for penalty calculations and some qualification math — it is rarely the rate anyone actually pays. The discounted rate is what is negotiated. When comparing offers, compare discounted rates, and also compare the penalty calculation method, because that can cost far more than a small rate difference if you break the mortgage early.

Why the Lowest Rate Is Not Always the Cheapest Mortgage

A rock-bottom rate can come with restrictive terms: limited prepayment privileges, a bona-fide sale clause preventing a mid-term switch, a harsh penalty formula, or no portability. Over a full term, those restrictions frequently cost more than the rate saved. Read the terms alongside the number.

Rates and lending rules change frequently. This page is educational — confirm current conditions with a licensed mortgage professional.

Frequently Asked Questions

What determines variable mortgage rates in Canada?

Variable rates are set as a discount or premium to a lender's prime rate, and prime moves with the Bank of Canada's overnight rate.

Why do fixed mortgage rates change when the Bank of Canada does nothing?

Fixed rates are priced off bond yields, particularly the Government of Canada 5-year yield. Bond markets move daily on economic expectations, so fixed rates can change without any Bank of Canada announcement.

Why is my insured mortgage rate lower than an uninsured one?

Default insurance transfers much of the lender's risk to the insurer, so insured mortgages with less than 20% down are often priced lower than uninsured mortgages.

Is the lowest advertised rate always the best mortgage?

No. Restrictive prepayment terms, sale-only clauses, and expensive penalty formulas can cost more over a term than the rate savings, especially if you break or change the mortgage early.

What is the difference between a posted rate and a discounted rate?

The posted rate is a published benchmark used mainly for penalty calculations; the discounted rate is the negotiated rate you actually pay.

Kyle Benzies, Licensed Mortgage Broker

I'm a licensed mortgage broker serving clients across British Columbia, Alberta, and Ontario. I work with a network of over 100 lenders — banks, credit unions, monoline, and alternative lenders — to find financing that fits each client's situation rather than a single institution's product shelf. Everything I publish here is written to explain how Canadian mortgage lending actually works, in plain language.

Published November 16, 2025 · Last reviewed August 1, 2026

Understanding How Mortgage Rates Work in Canada

Jump to Section

Key Takeaways