How Mortgage Rates Work: Fixed vs. Variable

Tim Lyon • September 26, 2025

What affects mortgage rates? Does the Bank of Canada rate affect fixed-rate mortgages? These are questions that come up all the time, so in this this post, I’ll explain how fixed and variable rates are determined, why they don’t always move together, and what that means for you as a borrower.


But to start with the short answer: While Bank of Canada announcements immediately impact variable rates, fixed rates usually have those expectations already baked in long before the announcement. That’s because fixed rates are forward-looking — they reflect where markets think rates are headed, not just where they are today.


What Are Fixed and Variable Rates?

Fixed Rate

The interest rate stays the same for the entire mortgage term. Payments remain consistent, no matter what happens in the market.


Variable Rate

The interest rate changes during the mortgage term, moving up or down depending on the lender’s prime rate. Payments may stay the same (VRM) or change (ARM).


How Do Fixed Rates Work?

When you choose a fixed rate, the lender is guaranteeing your rate for the length of your term. To do this, they need to estimate what a fair rate will be over that time. This makes fixed rates more forward-looking — they often reflect not just today’s conditions, but also what the market expects to happen in the future.


Key Points About Fixed Rates
  • Strongly influenced by the Canadian bond market (especially the 5-year government bond yield).
  • Lenders adjust their fixed rates based on investor expectations for inflation and future interest rates.
  • Often, Bank of Canada moves are already baked into fixed rates before they happen.


Example

If bond yields suggest that rates will rise in the next year, lenders may increase fixed rates now, even if the Bank of Canada hasn’t made a move yet.


How Do Variable Rates Work?

Variable rates move directly with the Bank of Canada’s overnight rate. When the Bank of Canada raises or lowers its rate, lenders adjust their prime rate accordingly, and variable mortgages follow.


For borrowers, the most important detail is the discount from prime, because that sets the actual rate you pay. For example, if prime is 4.95% and your mortgage is Prime – 0.5%, your rate is 4.45%.


The discounts lenders offer change over time. In periods of economic uncertainty, lenders usually shrink the discount they offer, which can make new variable mortgages less attractive even if prime is coming down.


Key Points About Variable Rates
  • Directly tied to the Bank of Canada’s overnight rate, which is reviewed eight times a year.
  • Banks adjust their prime rate in response to these moves.
  • Your actual rate = Prime – discount (e.g., Prime – 0.5%).


Example

If prime is 4.95% and your mortgage is Prime – 0.5%, your rate is 4.45%. If the Bank of Canada cuts rates by 0.25%, prime drops to 4.70%, and your rate automatically drops to 4.20%.


Why Don’t Fixed and Variable Always Move Together?

  • Fixed rates reflect the bond market, which looks ahead at where rates and inflation may go.
  • Variable rates respond directly to Bank of Canada decisions, reflecting current conditions.
  • This is why fixed rates can fall while variable rates stay flat, or vice versa.


Next Steps

If you’re deciding between fixed and variable, understanding how each is set is the first step. The next is to match the right mortgage type to your budget and comfort with risk. If you’d like to review which option works best for you, I’d be happy to help.


Need help with your mortgage? Book a consultation or call 778-988-8409.


Mortgage Term Glossary

Amortization: The total length of time it will take to pay off your mortgage completely (typically 25–30 years in Canada).
Bond Yield: The return investors get from government bonds. Used as a benchmark for fixed mortgage rates.
Discount (Variable Rate): The amount subtracted from prime to determine your actual mortgage rate.
Fixed Rate: An interest rate that stays the same for the entire mortgage term.
Mortgage Term: The length of your mortgage contract with your lender (typically 1–5 years), after which you need to renew.
Overnight Rate: The interest rate at which major banks borrow and lend money to each other, set by the Bank of Canada.
Prime Rate: The interest rate banks use as a baseline for loans, influenced by the Bank of Canada’s overnight rate.
Variable Rate: An interest rate that changes during your mortgage term based on lender prime rates.

Tim Lyon

Mortgage Consultant

Mortgage Renewal vs. Refinance: Understanding the Key Differences

By Tim Lyon • November 25, 2025
If you own a property with a mortgage, you've probably heard the terms "renewal" and "refinance" thrown around. While both involve obtaining a new term for your mortgage, there are some important differences to understand. Let's break down what each one means and when you might use them. Understanding Mortgage Basics In Canada, when you take out a mortgage, the payments are typically spread over 25 to 30 years. This period is known as the amortization. However, unlike in the U.S., Canadians do not keep the same interest rate and payment terms for the entire amortization period. Instead, you have an initial term, usually 3 to 5 years, after which you need to renew into a new term. For example, if you have a 25-year mortgage with 5-year terms, you will need to renew your mortgage four times throughout its lifespan. It's also common to have a mix of different term lengths over the course of your mortgage. What is a Mortgage Renewal? A mortgage renewal occurs at the end of your mortgage term. When you renew, you start a new term with a new interest rate while keeping the remaining details of your mortgage the same. The key element here is that the mortgage charge registered on your property's title remains unchanged. A renewal is straightforward and typically does not involve any significant changes to your mortgage agreement other than a new interest rate. Think of it as hitting the "continue" button on your mortgage, but at new rates. What is a Mortgage Refinance? A mortgage refinance is different. When you refinance, you are making changes to your original mortgage agreement. This means paying off your existing mortgage and registering a new one on your property's title. Essentially, you are taking out a completely new mortgage for the same property. People commonly refinance to: Access the equity in their home for investments or major purchases Consolidate high-interest debt into their lower-rate mortgage Extend the amortization period to reduce monthly payments and improve cash flow Make significant changes to their mortgage structure It's important to note that refinancing is not allowed for insured properties (those with less than a 20% down payment at purchase). This means the maximum loan amount in a refinance is 80% of your property value. What About Switching Lenders? If you want to keep everything the same but switch lenders for a better rate, this is known as a transfer. A transfer is a type of renewal where the original mortgage charge is transferred from one lender to another. Depending on the lenders involved, you might be able to make minor changes (like extending the amortization or changing borrowers) without needing a full refinance. Why Timing Matters Your mortgage maturity date is when your current term ends. This is the ideal time to either renew or refinance. If you refinance or switch lenders before the maturity date, you will face a prepayment penalty. If you refinance, renew or transfer at maturity, there is no penalty. Real-World Example A homeowner with a $450,000 mortgage is reaching the end of their 5-year term. Their lender offers a renewal rate, but they also have $40,000 in high-interest credit card debt. Option 1: Renewal They accept the new term. Their mortgage stays the same. Their debt remains separate at high interest rates. Option 2: Refinance at Maturity They consolidate the credit card debt into the new mortgage. Their total monthly payments drop significantly, even after accounting for the new mortgage balance. In this situation, refinancing provides better cash flow and a simpler payment structure. Quick Summary Mortgage Renewal: Starts a new term for your existing mortgage Mortgage charge on your title stays the same Keeps all other terms the same aside from interest rate Can switch lenders at renewal through a transfer No penalty when done at maturity Mortgage Refinance: Pays off current mortgage and creates a new one New mortgage charge registered on your title Often resets the amortization period Can access equity or make structural changes Maximum 80% of property value for uninsured mortgages Incurs penalty if done before maturity Next Steps Understanding the difference between renewal and refinance helps you make informed decisions about managing your mortgage. If you have a renewal coming up or are considering accessing your home equity, now is a good time to explore your options. Whether you're looking to renew, refinance, or switch lenders, I'm here to help you navigate the process and find the best solution for your situation. Need help with your mortgage? Book a consultation or call 778-988-8409 . Glossary Amortization: The total time period over which you'll pay off your mortgage, typically 25-30 years in Canada. Insured Mortgage: A mortgage where the down payment was less than 20%, requiring mortgage default insurance to be added. Maturity Date: The end date of your current mortgage term, when you need to renew or refinance. Mortgage Charge: The legal registration of your mortgage on your property's title. Pre-payment Penalty: A fee charged by your lender if you pay off your mortgage before the end of your term. Refinance: Replacing your existing mortgage with a new mortgage, often with different terms or to access equity. Renewal: Starting a new term for your existing mortgage, typically just updating the interest rate. Term: The length of time your current mortgage contract is in effect, typically 3-5 years in Canada. Transfer: Moving your mortgage from one lender to another at renewal without changing other terms.

What Is an Insured Mortgage and How Does It Work?

By Tim Lyon • October 28, 2025
If you're buying a home with less than 20% down, you'll need something called an insured mortgage. Many borrowers find this confusing at first, especially since it doesn’t refer to insurance for you, the borrower. That’s why I have put together this straightforward breakdown so you understand what insured mortgages are, why they exist, and how they affect your purchase. What Is an Insured Mortgage? A mortgage must be insured when a borrower makes a down payment of less than 20% on a home purchase. The insurance protects the lender (not the borrower) in case the borrower defaults. The insurance is guaranteed by the federal government. So, why do we have this program? It allows borrowers to buy homes with smaller down payments and higher loan-to-value (LTV) ratios. Higher loan-to-value mortgages are inherently more risky because there is not much cushion if the housing market starts to decline. For example, if someone buys a $500,000 home with only 5% down ($25,000), they’ll need a $475,000 mortgage—this is a 95% LTV . If the market drops and the home’s value falls to $470,000, the mortgage would still be $475,000. If the borrower stopped making payments, the lender could lose money after selling the home and paying costs. That kind of loss, multiplied across thousands of borrowers, could threaten the stability of the entire banking system (as we saw in the U.S. in 2008). The mortgage insurance system is designed to prevent that scenario by spreading risk and keeping lenders protected. How Does the Insurance Work? You, the borrower, pay the insurance premium. It's typically added directly to your mortgage balance rather than paid upfront. The cost depends on your down payment size and amortization. Example: Purchase price: $500,000 Down payment: $25,000 (5%) Mortgage amount: $475,000 Insurance premium: 4.2% = $19,950 Total new mortgage: $494,950 The insurance does add cost, but insured mortgages usually offer slightly lower interest rates because the lender's risk is minimal. The rate savings don't fully offset the premium, but they help. The Insurer’s Role For insured mortgages, the insurer’s approval is the most important part of the process. If the insurer won’t approve the file, no lender can. Once the insurer signs off, we can typically find a lender to fund the loan. Canada has three mortgage insurers: CMHC (public) Sagen (private) Canada Guaranty (private) All of the insurers are backed by government guarantees and have to follow similar rules, but each has a few unique programs. Lenders usually choose the insurer, though I sometimes work with them to send a file to a specific insurer if it benefits the borrower. Qualification Rules Because insured mortgages are government-backed, the rules are strict: Debt ratios: 39% of your income can go toward your stress-tested mortgage payment, property taxes, heat, and half of condo fees 44% of your income can go toward the above plus your other debts Down payment: 5% on the first $500,000, 10% on the remainder Maximum purchase price: $1.5 million Amortization: Maximum of 25 years for most buyers; up to 30 years for first-time buyers who qualify under the new federal program Unlike with an uninsured mortgage, where lenders may have some flexibility if your income ratios are slightly above the limits, there is no discretion on an insured mortgage. If your ratios exceed the limits even a little bit, the insurer will decline the application. The Approval Process The process is similar to an uninsured mortgage, with one extra step: We submit your mortgage application to the lender of choice They do their initial review If that looks good, they package it up and send it to the insurer Once the insurer has reviewed and approved it, the file comes back to the lender for final review and approval Common Misunderstandings About Insured Mortgages Many borrowers are surprised to learn the following facts about insured mortgages: You do not need to be a first-time homebuyer to buy with less than 20% down You cannot buy an investment property with less than 20% down You can buy a second home with less than 20% down You cannot refinance an insured mortgage and keep the insurance. If you have an insured mortgage and do refinance, you will lose the insurance. This mostly affects the lender, but it also moves you to uninsured rates. Why Choose an Insured Mortgage? Given the cost and restrictions, why would anyone choose an insured mortgage? The main reason is accessibility . It allows you to buy a home without saving a full 20% down payment, which is increasingly difficult with high home prices and living costs. It can also be a strategic choice. Some buyers prefer to keep more of their savings invested or diversified instead of tying everything up in a down payment. If your investments are earning more than your mortgage costs, keeping that money invested might make financial sense. Real-World Example Let's say you're buying a $600,000 home. Here's how the costs compare between the minimum down payment for an insured mortgage and the minimum down payment for an uninsured mortgage: