What drives fixed mortgage rates — the bond market explained
Fixed-rate mortgages in Canada are priced off Government of Canada bond yields, specifically the 5-year bond yield, because that matches the most common mortgage term. Banks and lenders fund fixed-rate mortgages by borrowing in the bond market or through securitization — when bond yields rise, their cost of funds increases, and they pass that cost on to borrowers through higher fixed rates.
The relationship is direct but not one-to-one. When the 5-year bond yield moves by 0.10%, fixed mortgage rates typically move by 0.05% to 0.10%, depending on competitive pressure and lender appetite. Rate changes can happen quickly — major bond yield moves on a Monday morning often translate to repriced mortgage rates by Tuesday or Wednesday.
The bond market itself is driven by inflation expectations, economic growth data, and global capital flows. When Statistics Canada reports stronger-than-expected GDP growth, bond yields tend to rise on the expectation that the Bank of Canada may need to keep rates higher for longer — and fixed mortgage rates follow. When inflation data comes in below expectations, bond yields typically fall, and fixed rates ease.
Fixed mortgage rates are anchored to bond market pricing, which reflects investor expectations about inflation and economic growth — not the Bank of Canada's overnight rate.
What drives variable mortgage rates — the Bank of Canada connection
Variable mortgage rates are priced off the prime rate, which moves directly with the Bank of Canada's overnight rate. When the Bank raises the overnight rate by 0.25%, prime rate rises by the same amount — and variable-rate mortgage payments adjust immediately. Unlike fixed rates, variable rates do not anticipate future moves — they respond only to actual Bank of Canada decisions.
The prime rate is set by each lender individually, but in practice, Canada's Big Six banks move prime in lockstep with each other and with the Bank of Canada. The typical spread is prime minus 0.50% to prime minus 1.20%, depending on the borrower's profile. An insured mortgage with strong credit might see prime minus 1.00%, while an uninsured rental property might see prime minus 0.30%.
The Bank of Canada sets the overnight rate eight times per year on pre-announced dates. Markets price in expectations ahead of each announcement, but variable-rate borrowers experience the actual change only after the Bank acts. This makes variable rates more predictable in terms of timing — you know exactly when your rate can change — but less predictable in terms of total interest cost over five years.
Lender spreads — why your rate is not just the benchmark
Lenders do not lend at the bond yield or the overnight rate. They add a spread — typically 1.0% to 2.0% above the underlying benchmark — to cover their costs and generate profit. This spread compensates the lender for credit risk (the possibility you might default), prepayment risk (you might break the mortgage early), operating costs (branches, underwriters, technology), and return on capital.
The spread varies significantly by mortgage type. Insured mortgages — those with less than 20% down and CMHC, Sagen, or Canada Guaranty insurance — carry the lowest spreads because the lender faces essentially zero credit risk. The insurer absorbs the loss if you default. As a result, insured mortgages often price 0.3% to 0.6% below comparable uninsured mortgages.
Uninsurable mortgages — typically those on properties over $1 million, rental properties, or extended amortizations — carry the widest spreads because they represent the highest risk to the lender. A 5-year fixed insured mortgage might price at 4.49%, while the same term on an uninsurable rental property might price at 4.95% or higher — the 0.46% difference is the risk spread.
- Insured (<20% down): lowest spread — lender protected by CMHC/Sagen/Canada Guaranty
- Insurable (20%+ down, conforming): moderate spread — lower risk, no insurance premium required
- Uninsurable (>$1M, rental, extended amortization): widest spread — highest lender risk
- Credit score, debt ratios, and property type also influence your specific spread
The difference between insured and uninsured rates can be 0.3% to 0.6% — a gap that represents the lender's risk assessment of your specific file.
Posted rates vs discounted rates — the difference that matters
Every lender publishes 'posted rates' — the official rate card you see on bank websites and rate comparison sites. In practice, almost no borrower pays the posted rate. Lenders discount from the posted rate based on the deal's competitiveness, the borrower's profile, and market conditions. The discount can range from 0.5% to over 2.0% below posted.
Posted rates serve two functions. First, they establish a starting point for negotiation. Second — and more importantly — they determine the interest rate differential (IRD) penalty if you break a fixed-rate mortgage early. Most lenders calculate IRD penalties using the posted rate at origination versus the current posted rate for the remaining term — not the discounted rate you actually paid. This means your break penalty can be substantially larger than it would be if calculated on the discounted rate.
When comparing mortgage offers, always look at the discounted rate — the actual rate you will pay — not the posted rate. Two lenders offering the same posted rate may offer very different discounted rates depending on their current volume targets, risk appetite, and promotional campaigns. A broker can access discounted rates from multiple lenders simultaneously.
- Posted rates: official rate card — rarely paid by borrowers
- Discounted rates: actual rate offered — typically 1% to 2% below posted
- IRD penalties often calculated on posted rates — making them larger
- Compare discounted rates across lenders, not posted rates
Rate holds — how to lock in a rate before you have an accepted offer
A rate hold lets you lock in a mortgage rate for a set period — typically 90 to 120 days — before you have an accepted purchase offer. If rates rise during the hold period, your rate is protected. If rates fall, most lenders will honour the lower rate. This is effectively a one-way option that costs you nothing.
Rate holds are valuable when you are actively shopping for a home in a rising rate environment. If the 5-year bond yield climbs 0.30% while you are putting in offers, a rate hold saves you approximately $5,400 in additional interest over the five-year term on a $500,000 mortgage — with no downside if rates stay flat or fall.
You can obtain multiple rate holds from different lenders — there is no restriction. A broker can arrange rate holds with several lenders simultaneously, which both protects you from rate increases and allows you to compare final discounted rates when you have an accepted offer and can firm up your application.
A 120-day rate hold protects you from rising rates while you shop — and costs nothing if rates fall further.
How to shop and compare mortgage rates effectively
Shopping for a mortgage rate is not like shopping for a television — the lowest advertised rate is often attached to the most restrictive product. A 4.29% rate with no prepayment privileges, a 3% penalty to break, and no portability may cost far more over five years than a 4.49% rate with full prepayment options, a fair penalty formula, and full portability.
The most effective approach is to compare the full product, not just the rate. Ask about prepayment privileges (can you pay extra without penalty?), the penalty formula (is it IRD calculated on posted or discounted rates?), portability (can you move the mortgage to a new property?), and assumptions (can a qualified buyer take over your mortgage?).
Working with a broker gives you access to rates from 40+ lenders through a single application. The broker's job is to match your specific scenario — purchase price, down payment, credit, income structure — to the lender whose underwriting rules and rate pricing are most favorable. A self-employed borrower with strong income but variable documentation may get a better rate from a lender that specializes in that profile than from the lender advertising the lowest headline rate.
Understanding rate trends — what the data actually tells you
Mortgage rate forecasting is difficult even for professionals, but borrowers can make better decisions by understanding the signals. The bond market prices in expectations — if 5-year bond yields are falling, the market expects lower rates ahead. If yields are rising, the market expects inflation pressure or stronger growth to keep rates elevated.
The Bank of Canada publishes a schedule of eight interest rate announcement dates per year. These dates are known months in advance and give variable-rate borrowers a clear calendar for when their rate could change. Between announcements, the Bank also publishes the Monetary Policy Report quarterly, which provides detailed analysis of the economic conditions driving rate decisions.
Historical context helps. The average 5-year fixed mortgage rate in Canada from 2000 to 2025 was approximately 4.5%. Rates below 3% — which existed from 2020 to 2022 — were historically anomalous and driven by pandemic emergency measures. Borrowers planning their budget around rates returning to those levels are likely to be disappointed. Building your financial plan around a rate in the 3.5% to 5% range is more consistent with long-term Canadian mortgage history.
The average Canadian 5-year fixed rate since 2000 is approximately 4.5% — rates below 3% from 2020-2022 were a historical exception.
Frequently asked questions
What is the difference between the Bank of Canada rate and mortgage rates?
The Bank of Canada overnight rate directly influences variable mortgage rates through the prime rate — when the Bank changes its rate, variable rates adjust. Fixed mortgage rates are driven by 5-year Government of Canada bond yields, which reflect bond market expectations about future inflation and growth. The Bank of Canada rate and bond yields can move in opposite directions, which is why fixed and variable rates sometimes diverge.
Why do insured mortgages get lower rates than uninsured mortgages?
Insured mortgages carry mortgage default insurance from CMHC, Sagen, or Canada Guaranty, which protects the lender against borrower default. Because the lender faces essentially zero credit risk on an insured mortgage, they can offer a lower rate — typically 0.3% to 0.6% below an equivalent uninsured mortgage. The borrower pays for this insurance through the premium (added to the mortgage), but the rate savings over five years often offset a significant portion of the premium cost.
Should I lock in a fixed rate or go variable?
The fixed vs variable decision depends on your risk tolerance and financial buffer. Variable rates have historically been lower than fixed rates over the full term about 70% of the time in Canada, but they carry the risk of rising payments if the Bank of Canada raises rates. Fixed rates offer payment certainty for the term. A good approach is to compare the current spread — if the difference between 5-year fixed and variable is less than 0.50%, fixed may be more attractive because you are paying relatively little for the certainty.
What is a rate hold and how long does it last?
A rate hold locks in a mortgage rate for a set period — typically 90 to 120 days — while you shop for a home. If rates rise during the hold, your rate is protected. If rates fall, most lenders will offer the lower rate. Rate holds are free and you can obtain multiple holds from different lenders simultaneously. Once you have an accepted purchase offer, the held rate can be applied to your mortgage application.
Why is the posted rate higher than the rate I'm actually offered?
Posted rates are the official rate card rates that lenders publish. They serve as a starting point for negotiation and — importantly — are used to calculate interest rate differential (IRD) penalties if you break a fixed-rate mortgage early. The discounted rate is the actual rate you pay, typically 1% to 2% below the posted rate. The gap between posted and discounted rates varies by lender and market conditions.
How quickly do mortgage rates change after bond yields move?
Fixed mortgage rates typically adjust within 24 to 48 hours of a significant bond yield move. If the 5-year bond yield spikes on a Monday, lenders often issue repriced rate sheets by Tuesday or Wednesday. Variable rates change only after the Bank of Canada announces an overnight rate change — on the eight pre-scheduled announcement dates per year. Between announcements, variable rates generally remain stable.
What is the prime rate and who sets it?
The prime rate is the base rate that Canadian lenders use to price variable-rate mortgages and lines of credit. Each lender sets its own prime rate, but in practice, the Big Six banks all follow each other and move prime in lockstep with the Bank of Canada overnight rate. As of early 2026, the prime rate at most Canadian lenders is approximately 5.45%, reflecting the Bank of Canada's policy rate plus a 2.20% spread.
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